1 /* 2 * Copyright (c) 1995, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package java.awt; 26 27 import java.io.PrintStream; 28 import java.io.PrintWriter; 29 import java.util.Objects; 30 import java.util.Vector; 31 import java.util.Locale; 32 import java.util.EventListener; 33 import java.util.HashSet; 34 import java.util.Map; 35 import java.util.Set; 36 import java.util.Collections; 37 import java.awt.peer.ComponentPeer; 38 import java.awt.peer.ContainerPeer; 39 import java.awt.peer.LightweightPeer; 40 import java.awt.image.BufferStrategy; 41 import java.awt.image.ImageObserver; 42 import java.awt.image.ImageProducer; 43 import java.awt.image.ColorModel; 44 import java.awt.image.VolatileImage; 45 import java.awt.event.*; 46 import java.io.Serializable; 47 import java.io.ObjectOutputStream; 48 import java.io.ObjectInputStream; 49 import java.io.IOException; 50 import java.beans.PropertyChangeListener; 51 import java.beans.PropertyChangeSupport; 52 import java.beans.Transient; 53 import java.awt.im.InputContext; 54 import java.awt.im.InputMethodRequests; 55 import java.awt.dnd.DropTarget; 56 import java.lang.reflect.InvocationTargetException; 57 import java.lang.reflect.Method; 58 import java.security.AccessController; 59 import java.security.PrivilegedAction; 60 import java.security.AccessControlContext; 61 import javax.accessibility.*; 62 import java.applet.Applet; 63 64 import sun.awt.ComponentFactory; 65 import sun.security.action.GetPropertyAction; 66 import sun.awt.AppContext; 67 import sun.awt.AWTAccessor; 68 import sun.awt.ConstrainableGraphics; 69 import sun.awt.SubRegionShowable; 70 import sun.awt.SunToolkit; 71 import sun.awt.CausedFocusEvent; 72 import sun.awt.EmbeddedFrame; 73 import sun.awt.dnd.SunDropTargetEvent; 74 import sun.awt.im.CompositionArea; 75 import sun.font.FontManager; 76 import sun.font.FontManagerFactory; 77 import sun.font.SunFontManager; 78 import sun.java2d.SunGraphics2D; 79 import sun.java2d.pipe.Region; 80 import sun.awt.image.VSyncedBSManager; 81 import sun.java2d.pipe.hw.ExtendedBufferCapabilities; 82 import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.*; 83 import sun.awt.RequestFocusController; 84 import sun.java2d.SunGraphicsEnvironment; 85 import sun.util.logging.PlatformLogger; 86 87 /** 88 * A <em>component</em> is an object having a graphical representation 89 * that can be displayed on the screen and that can interact with the 90 * user. Examples of components are the buttons, checkboxes, and scrollbars 91 * of a typical graphical user interface. <p> 92 * The <code>Component</code> class is the abstract superclass of 93 * the nonmenu-related Abstract Window Toolkit components. Class 94 * <code>Component</code> can also be extended directly to create a 95 * lightweight component. A lightweight component is a component that is 96 * not associated with a native window. On the contrary, a heavyweight 97 * component is associated with a native window. The {@link #isLightweight()} 98 * method may be used to distinguish between the two kinds of the components. 99 * <p> 100 * Lightweight and heavyweight components may be mixed in a single component 101 * hierarchy. However, for correct operating of such a mixed hierarchy of 102 * components, the whole hierarchy must be valid. When the hierarchy gets 103 * invalidated, like after changing the bounds of components, or 104 * adding/removing components to/from containers, the whole hierarchy must be 105 * validated afterwards by means of the {@link Container#validate()} method 106 * invoked on the top-most invalid container of the hierarchy. 107 * 108 * <h3>Serialization</h3> 109 * It is important to note that only AWT listeners which conform 110 * to the <code>Serializable</code> protocol will be saved when 111 * the object is stored. If an AWT object has listeners that 112 * aren't marked serializable, they will be dropped at 113 * <code>writeObject</code> time. Developers will need, as always, 114 * to consider the implications of making an object serializable. 115 * One situation to watch out for is this: 116 * <pre> 117 * import java.awt.*; 118 * import java.awt.event.*; 119 * import java.io.Serializable; 120 * 121 * class MyApp implements ActionListener, Serializable 122 * { 123 * BigObjectThatShouldNotBeSerializedWithAButton bigOne; 124 * Button aButton = new Button(); 125 * 126 * MyApp() 127 * { 128 * // Oops, now aButton has a listener with a reference 129 * // to bigOne! 130 * aButton.addActionListener(this); 131 * } 132 * 133 * public void actionPerformed(ActionEvent e) 134 * { 135 * System.out.println("Hello There"); 136 * } 137 * } 138 * </pre> 139 * In this example, serializing <code>aButton</code> by itself 140 * will cause <code>MyApp</code> and everything it refers to 141 * to be serialized as well. The problem is that the listener 142 * is serializable by coincidence, not by design. To separate 143 * the decisions about <code>MyApp</code> and the 144 * <code>ActionListener</code> being serializable one can use a 145 * nested class, as in the following example: 146 * <pre> 147 * import java.awt.*; 148 * import java.awt.event.*; 149 * import java.io.Serializable; 150 * 151 * class MyApp implements java.io.Serializable 152 * { 153 * BigObjectThatShouldNotBeSerializedWithAButton bigOne; 154 * Button aButton = new Button(); 155 * 156 * static class MyActionListener implements ActionListener 157 * { 158 * public void actionPerformed(ActionEvent e) 159 * { 160 * System.out.println("Hello There"); 161 * } 162 * } 163 * 164 * MyApp() 165 * { 166 * aButton.addActionListener(new MyActionListener()); 167 * } 168 * } 169 * </pre> 170 * <p> 171 * <b>Note</b>: For more information on the paint mechanisms utilized 172 * by AWT and Swing, including information on how to write the most 173 * efficient painting code, see 174 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 175 * <p> 176 * For details on the focus subsystem, see 177 * <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html"> 178 * How to Use the Focus Subsystem</a>, 179 * a section in <em>The Java Tutorial</em>, and the 180 * <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a> 181 * for more information. 182 * 183 * @author Arthur van Hoff 184 * @author Sami Shaio 185 */ 186 public abstract class Component implements ImageObserver, MenuContainer, 187 Serializable 188 { 189 190 private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.Component"); 191 private static final PlatformLogger eventLog = PlatformLogger.getLogger("java.awt.event.Component"); 192 private static final PlatformLogger focusLog = PlatformLogger.getLogger("java.awt.focus.Component"); 193 private static final PlatformLogger mixingLog = PlatformLogger.getLogger("java.awt.mixing.Component"); 194 195 /** 196 * The peer of the component. The peer implements the component's 197 * behavior. The peer is set when the <code>Component</code> is 198 * added to a container that also is a peer. 199 * @see #addNotify 200 * @see #removeNotify 201 */ 202 transient volatile ComponentPeer peer; 203 204 /** 205 * The parent of the object. It may be <code>null</code> 206 * for top-level components. 207 * @see #getParent 208 */ 209 transient Container parent; 210 211 /** 212 * The <code>AppContext</code> of the component. Applets/Plugin may 213 * change the AppContext. 214 */ 215 transient AppContext appContext; 216 217 /** 218 * The x position of the component in the parent's coordinate system. 219 * 220 * @serial 221 * @see #getLocation 222 */ 223 int x; 224 225 /** 226 * The y position of the component in the parent's coordinate system. 227 * 228 * @serial 229 * @see #getLocation 230 */ 231 int y; 232 233 /** 234 * The width of the component. 235 * 236 * @serial 237 * @see #getSize 238 */ 239 int width; 240 241 /** 242 * The height of the component. 243 * 244 * @serial 245 * @see #getSize 246 */ 247 int height; 248 249 /** 250 * The foreground color for this component. 251 * <code>foreground</code> can be <code>null</code>. 252 * 253 * @serial 254 * @see #getForeground 255 * @see #setForeground 256 */ 257 Color foreground; 258 259 /** 260 * The background color for this component. 261 * <code>background</code> can be <code>null</code>. 262 * 263 * @serial 264 * @see #getBackground 265 * @see #setBackground 266 */ 267 Color background; 268 269 /** 270 * The font used by this component. 271 * The <code>font</code> can be <code>null</code>. 272 * 273 * @serial 274 * @see #getFont 275 * @see #setFont 276 */ 277 volatile Font font; 278 279 /** 280 * The font which the peer is currently using. 281 * (<code>null</code> if no peer exists.) 282 */ 283 Font peerFont; 284 285 /** 286 * The cursor displayed when pointer is over this component. 287 * This value can be <code>null</code>. 288 * 289 * @serial 290 * @see #getCursor 291 * @see #setCursor 292 */ 293 Cursor cursor; 294 295 /** 296 * The locale for the component. 297 * 298 * @serial 299 * @see #getLocale 300 * @see #setLocale 301 */ 302 Locale locale; 303 304 /** 305 * A reference to a <code>GraphicsConfiguration</code> object 306 * used to describe the characteristics of a graphics 307 * destination. 308 * This value can be <code>null</code>. 309 * 310 * @since 1.3 311 * @serial 312 * @see GraphicsConfiguration 313 * @see #getGraphicsConfiguration 314 */ 315 private transient GraphicsConfiguration graphicsConfig = null; 316 317 /** 318 * A reference to a <code>BufferStrategy</code> object 319 * used to manipulate the buffers on this component. 320 * 321 * @since 1.4 322 * @see java.awt.image.BufferStrategy 323 * @see #getBufferStrategy() 324 */ 325 transient BufferStrategy bufferStrategy = null; 326 327 /** 328 * True when the object should ignore all repaint events. 329 * 330 * @since 1.4 331 * @serial 332 * @see #setIgnoreRepaint 333 * @see #getIgnoreRepaint 334 */ 335 boolean ignoreRepaint = false; 336 337 /** 338 * True when the object is visible. An object that is not 339 * visible is not drawn on the screen. 340 * 341 * @serial 342 * @see #isVisible 343 * @see #setVisible 344 */ 345 boolean visible = true; 346 347 /** 348 * True when the object is enabled. An object that is not 349 * enabled does not interact with the user. 350 * 351 * @serial 352 * @see #isEnabled 353 * @see #setEnabled 354 */ 355 boolean enabled = true; 356 357 /** 358 * True when the object is valid. An invalid object needs to 359 * be laid out. This flag is set to false when the object 360 * size is changed. 361 * 362 * @serial 363 * @see #isValid 364 * @see #validate 365 * @see #invalidate 366 */ 367 private volatile boolean valid = false; 368 369 /** 370 * The <code>DropTarget</code> associated with this component. 371 * 372 * @since 1.2 373 * @serial 374 * @see #setDropTarget 375 * @see #getDropTarget 376 */ 377 DropTarget dropTarget; 378 379 /** 380 * @serial 381 * @see #add 382 */ 383 Vector<PopupMenu> popups; 384 385 /** 386 * A component's name. 387 * This field can be <code>null</code>. 388 * 389 * @serial 390 * @see #getName 391 * @see #setName(String) 392 */ 393 private String name; 394 395 /** 396 * A bool to determine whether the name has 397 * been set explicitly. <code>nameExplicitlySet</code> will 398 * be false if the name has not been set and 399 * true if it has. 400 * 401 * @serial 402 * @see #getName 403 * @see #setName(String) 404 */ 405 private boolean nameExplicitlySet = false; 406 407 /** 408 * Indicates whether this Component can be focused. 409 * 410 * @serial 411 * @see #setFocusable 412 * @see #isFocusable 413 * @since 1.4 414 */ 415 private boolean focusable = true; 416 417 private static final int FOCUS_TRAVERSABLE_UNKNOWN = 0; 418 private static final int FOCUS_TRAVERSABLE_DEFAULT = 1; 419 private static final int FOCUS_TRAVERSABLE_SET = 2; 420 421 /** 422 * Tracks whether this Component is relying on default focus traversability. 423 * 424 * @serial 425 * @since 1.4 426 */ 427 private int isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN; 428 429 /** 430 * The focus traversal keys. These keys will generate focus traversal 431 * behavior for Components for which focus traversal keys are enabled. If a 432 * value of null is specified for a traversal key, this Component inherits 433 * that traversal key from its parent. If all ancestors of this Component 434 * have null specified for that traversal key, then the current 435 * KeyboardFocusManager's default traversal key is used. 436 * 437 * @serial 438 * @see #setFocusTraversalKeys 439 * @see #getFocusTraversalKeys 440 * @since 1.4 441 */ 442 Set<AWTKeyStroke>[] focusTraversalKeys; 443 444 private static final String[] focusTraversalKeyPropertyNames = { 445 "forwardFocusTraversalKeys", 446 "backwardFocusTraversalKeys", 447 "upCycleFocusTraversalKeys", 448 "downCycleFocusTraversalKeys" 449 }; 450 451 /** 452 * Indicates whether focus traversal keys are enabled for this Component. 453 * Components for which focus traversal keys are disabled receive key 454 * events for focus traversal keys. Components for which focus traversal 455 * keys are enabled do not see these events; instead, the events are 456 * automatically converted to traversal operations. 457 * 458 * @serial 459 * @see #setFocusTraversalKeysEnabled 460 * @see #getFocusTraversalKeysEnabled 461 * @since 1.4 462 */ 463 private boolean focusTraversalKeysEnabled = true; 464 465 /** 466 * The locking object for AWT component-tree and layout operations. 467 * 468 * @see #getTreeLock 469 */ 470 static final Object LOCK = new AWTTreeLock(); 471 static class AWTTreeLock {} 472 473 /* 474 * The component's AccessControlContext. 475 */ 476 private transient volatile AccessControlContext acc = 477 AccessController.getContext(); 478 479 /** 480 * Minimum size. 481 * (This field perhaps should have been transient). 482 * 483 * @serial 484 */ 485 Dimension minSize; 486 487 /** 488 * Whether or not setMinimumSize has been invoked with a non-null value. 489 */ 490 boolean minSizeSet; 491 492 /** 493 * Preferred size. 494 * (This field perhaps should have been transient). 495 * 496 * @serial 497 */ 498 Dimension prefSize; 499 500 /** 501 * Whether or not setPreferredSize has been invoked with a non-null value. 502 */ 503 boolean prefSizeSet; 504 505 /** 506 * Maximum size 507 * 508 * @serial 509 */ 510 Dimension maxSize; 511 512 /** 513 * Whether or not setMaximumSize has been invoked with a non-null value. 514 */ 515 boolean maxSizeSet; 516 517 /** 518 * The orientation for this component. 519 * @see #getComponentOrientation 520 * @see #setComponentOrientation 521 */ 522 transient ComponentOrientation componentOrientation 523 = ComponentOrientation.UNKNOWN; 524 525 /** 526 * <code>newEventsOnly</code> will be true if the event is 527 * one of the event types enabled for the component. 528 * It will then allow for normal processing to 529 * continue. If it is false the event is passed 530 * to the component's parent and up the ancestor 531 * tree until the event has been consumed. 532 * 533 * @serial 534 * @see #dispatchEvent 535 */ 536 boolean newEventsOnly = false; 537 transient ComponentListener componentListener; 538 transient FocusListener focusListener; 539 transient HierarchyListener hierarchyListener; 540 transient HierarchyBoundsListener hierarchyBoundsListener; 541 transient KeyListener keyListener; 542 transient MouseListener mouseListener; 543 transient MouseMotionListener mouseMotionListener; 544 transient MouseWheelListener mouseWheelListener; 545 transient InputMethodListener inputMethodListener; 546 547 /** Internal, constants for serialization */ 548 final static String actionListenerK = "actionL"; 549 final static String adjustmentListenerK = "adjustmentL"; 550 final static String componentListenerK = "componentL"; 551 final static String containerListenerK = "containerL"; 552 final static String focusListenerK = "focusL"; 553 final static String itemListenerK = "itemL"; 554 final static String keyListenerK = "keyL"; 555 final static String mouseListenerK = "mouseL"; 556 final static String mouseMotionListenerK = "mouseMotionL"; 557 final static String mouseWheelListenerK = "mouseWheelL"; 558 final static String textListenerK = "textL"; 559 final static String ownedWindowK = "ownedL"; 560 final static String windowListenerK = "windowL"; 561 final static String inputMethodListenerK = "inputMethodL"; 562 final static String hierarchyListenerK = "hierarchyL"; 563 final static String hierarchyBoundsListenerK = "hierarchyBoundsL"; 564 final static String windowStateListenerK = "windowStateL"; 565 final static String windowFocusListenerK = "windowFocusL"; 566 567 /** 568 * The <code>eventMask</code> is ONLY set by subclasses via 569 * <code>enableEvents</code>. 570 * The mask should NOT be set when listeners are registered 571 * so that we can distinguish the difference between when 572 * listeners request events and subclasses request them. 573 * One bit is used to indicate whether input methods are 574 * enabled; this bit is set by <code>enableInputMethods</code> and is 575 * on by default. 576 * 577 * @serial 578 * @see #enableInputMethods 579 * @see AWTEvent 580 */ 581 long eventMask = AWTEvent.INPUT_METHODS_ENABLED_MASK; 582 583 /** 584 * Static properties for incremental drawing. 585 * @see #imageUpdate 586 */ 587 static boolean isInc; 588 static int incRate; 589 static { 590 /* ensure that the necessary native libraries are loaded */ 591 Toolkit.loadLibraries(); 592 /* initialize JNI field and method ids */ 593 if (!GraphicsEnvironment.isHeadless()) { 594 initIDs(); 595 } 596 597 String s = java.security.AccessController.doPrivileged( 598 new GetPropertyAction("awt.image.incrementaldraw")); 599 isInc = (s == null || s.equals("true")); 600 601 s = java.security.AccessController.doPrivileged( 602 new GetPropertyAction("awt.image.redrawrate")); 603 incRate = (s != null) ? Integer.parseInt(s) : 100; 604 } 605 606 /** 607 * Ease-of-use constant for <code>getAlignmentY()</code>. 608 * Specifies an alignment to the top of the component. 609 * @see #getAlignmentY 610 */ 611 public static final float TOP_ALIGNMENT = 0.0f; 612 613 /** 614 * Ease-of-use constant for <code>getAlignmentY</code> and 615 * <code>getAlignmentX</code>. Specifies an alignment to 616 * the center of the component 617 * @see #getAlignmentX 618 * @see #getAlignmentY 619 */ 620 public static final float CENTER_ALIGNMENT = 0.5f; 621 622 /** 623 * Ease-of-use constant for <code>getAlignmentY</code>. 624 * Specifies an alignment to the bottom of the component. 625 * @see #getAlignmentY 626 */ 627 public static final float BOTTOM_ALIGNMENT = 1.0f; 628 629 /** 630 * Ease-of-use constant for <code>getAlignmentX</code>. 631 * Specifies an alignment to the left side of the component. 632 * @see #getAlignmentX 633 */ 634 public static final float LEFT_ALIGNMENT = 0.0f; 635 636 /** 637 * Ease-of-use constant for <code>getAlignmentX</code>. 638 * Specifies an alignment to the right side of the component. 639 * @see #getAlignmentX 640 */ 641 public static final float RIGHT_ALIGNMENT = 1.0f; 642 643 /* 644 * JDK 1.1 serialVersionUID 645 */ 646 private static final long serialVersionUID = -7644114512714619750L; 647 648 /** 649 * If any <code>PropertyChangeListeners</code> have been registered, 650 * the <code>changeSupport</code> field describes them. 651 * 652 * @serial 653 * @since 1.2 654 * @see #addPropertyChangeListener 655 * @see #removePropertyChangeListener 656 * @see #firePropertyChange 657 */ 658 private PropertyChangeSupport changeSupport; 659 660 /* 661 * In some cases using "this" as an object to synchronize by 662 * can lead to a deadlock if client code also uses synchronization 663 * by a component object. For every such situation revealed we should 664 * consider possibility of replacing "this" with the package private 665 * objectLock object introduced below. So far there are 3 issues known: 666 * - CR 6708322 (the getName/setName methods); 667 * - CR 6608764 (the PropertyChangeListener machinery); 668 * - CR 7108598 (the Container.paint/KeyboardFocusManager.clearMostRecentFocusOwner methods). 669 * 670 * Note: this field is considered final, though readObject() prohibits 671 * initializing final fields. 672 */ 673 private transient Object objectLock = new Object(); 674 Object getObjectLock() { 675 return objectLock; 676 } 677 678 /* 679 * Returns the acc this component was constructed with. 680 */ 681 final AccessControlContext getAccessControlContext() { 682 if (acc == null) { 683 throw new SecurityException("Component is missing AccessControlContext"); 684 } 685 return acc; 686 } 687 688 boolean isPacked = false; 689 690 /** 691 * Pseudoparameter for direct Geometry API (setLocation, setBounds setSize 692 * to signal setBounds what's changing. Should be used under TreeLock. 693 * This is only needed due to the inability to change the cross-calling 694 * order of public and deprecated methods. 695 */ 696 private int boundsOp = ComponentPeer.DEFAULT_OPERATION; 697 698 /** 699 * Enumeration of the common ways the baseline of a component can 700 * change as the size changes. The baseline resize behavior is 701 * primarily for layout managers that need to know how the 702 * position of the baseline changes as the component size changes. 703 * In general the baseline resize behavior will be valid for sizes 704 * greater than or equal to the minimum size (the actual minimum 705 * size; not a developer specified minimum size). For sizes 706 * smaller than the minimum size the baseline may change in a way 707 * other than the baseline resize behavior indicates. Similarly, 708 * as the size approaches <code>Integer.MAX_VALUE</code> and/or 709 * <code>Short.MAX_VALUE</code> the baseline may change in a way 710 * other than the baseline resize behavior indicates. 711 * 712 * @see #getBaselineResizeBehavior 713 * @see #getBaseline(int,int) 714 * @since 1.6 715 */ 716 public enum BaselineResizeBehavior { 717 /** 718 * Indicates the baseline remains fixed relative to the 719 * y-origin. That is, <code>getBaseline</code> returns 720 * the same value regardless of the height or width. For example, a 721 * <code>JLabel</code> containing non-empty text with a 722 * vertical alignment of <code>TOP</code> should have a 723 * baseline type of <code>CONSTANT_ASCENT</code>. 724 */ 725 CONSTANT_ASCENT, 726 727 /** 728 * Indicates the baseline remains fixed relative to the height 729 * and does not change as the width is varied. That is, for 730 * any height H the difference between H and 731 * <code>getBaseline(w, H)</code> is the same. For example, a 732 * <code>JLabel</code> containing non-empty text with a 733 * vertical alignment of <code>BOTTOM</code> should have a 734 * baseline type of <code>CONSTANT_DESCENT</code>. 735 */ 736 CONSTANT_DESCENT, 737 738 /** 739 * Indicates the baseline remains a fixed distance from 740 * the center of the component. That is, for any height H the 741 * difference between <code>getBaseline(w, H)</code> and 742 * <code>H / 2</code> is the same (plus or minus one depending upon 743 * rounding error). 744 * <p> 745 * Because of possible rounding errors it is recommended 746 * you ask for the baseline with two consecutive heights and use 747 * the return value to determine if you need to pad calculations 748 * by 1. The following shows how to calculate the baseline for 749 * any height: 750 * <pre> 751 * Dimension preferredSize = component.getPreferredSize(); 752 * int baseline = getBaseline(preferredSize.width, 753 * preferredSize.height); 754 * int nextBaseline = getBaseline(preferredSize.width, 755 * preferredSize.height + 1); 756 * // Amount to add to height when calculating where baseline 757 * // lands for a particular height: 758 * int padding = 0; 759 * // Where the baseline is relative to the mid point 760 * int baselineOffset = baseline - height / 2; 761 * if (preferredSize.height % 2 == 0 && 762 * baseline != nextBaseline) { 763 * padding = 1; 764 * } 765 * else if (preferredSize.height % 2 == 1 && 766 * baseline == nextBaseline) { 767 * baselineOffset--; 768 * padding = 1; 769 * } 770 * // The following calculates where the baseline lands for 771 * // the height z: 772 * int calculatedBaseline = (z + padding) / 2 + baselineOffset; 773 * </pre> 774 */ 775 CENTER_OFFSET, 776 777 /** 778 * Indicates the baseline resize behavior can not be expressed using 779 * any of the other constants. This may also indicate the baseline 780 * varies with the width of the component. This is also returned 781 * by components that do not have a baseline. 782 */ 783 OTHER 784 } 785 786 /* 787 * The shape set with the applyCompoundShape() method. It includes the result 788 * of the HW/LW mixing related shape computation. It may also include 789 * the user-specified shape of the component. 790 * The 'null' value means the component has normal shape (or has no shape at all) 791 * and applyCompoundShape() will skip the following shape identical to normal. 792 */ 793 private transient Region compoundShape = null; 794 795 /* 796 * Represents the shape of this lightweight component to be cut out from 797 * heavyweight components should they intersect. Possible values: 798 * 1. null - consider the shape rectangular 799 * 2. EMPTY_REGION - nothing gets cut out (children still get cut out) 800 * 3. non-empty - this shape gets cut out. 801 */ 802 private transient Region mixingCutoutRegion = null; 803 804 /* 805 * Indicates whether addNotify() is complete 806 * (i.e. the peer is created). 807 */ 808 private transient boolean isAddNotifyComplete = false; 809 810 /** 811 * Should only be used in subclass getBounds to check that part of bounds 812 * is actually changing 813 */ 814 int getBoundsOp() { 815 assert Thread.holdsLock(getTreeLock()); 816 return boundsOp; 817 } 818 819 void setBoundsOp(int op) { 820 assert Thread.holdsLock(getTreeLock()); 821 if (op == ComponentPeer.RESET_OPERATION) { 822 boundsOp = ComponentPeer.DEFAULT_OPERATION; 823 } else 824 if (boundsOp == ComponentPeer.DEFAULT_OPERATION) { 825 boundsOp = op; 826 } 827 } 828 829 // Whether this Component has had the background erase flag 830 // specified via SunToolkit.disableBackgroundErase(). This is 831 // needed in order to make this function work on X11 platforms, 832 // where currently there is no chance to interpose on the creation 833 // of the peer and therefore the call to XSetBackground. 834 transient boolean backgroundEraseDisabled; 835 836 static { 837 AWTAccessor.setComponentAccessor(new AWTAccessor.ComponentAccessor() { 838 public void setBackgroundEraseDisabled(Component comp, boolean disabled) { 839 comp.backgroundEraseDisabled = disabled; 840 } 841 public boolean getBackgroundEraseDisabled(Component comp) { 842 return comp.backgroundEraseDisabled; 843 } 844 public Rectangle getBounds(Component comp) { 845 return new Rectangle(comp.x, comp.y, comp.width, comp.height); 846 } 847 public void setMixingCutoutShape(Component comp, Shape shape) { 848 Region region = shape == null ? null : 849 Region.getInstance(shape, null); 850 851 synchronized (comp.getTreeLock()) { 852 boolean needShowing = false; 853 boolean needHiding = false; 854 855 if (!comp.isNonOpaqueForMixing()) { 856 needHiding = true; 857 } 858 859 comp.mixingCutoutRegion = region; 860 861 if (!comp.isNonOpaqueForMixing()) { 862 needShowing = true; 863 } 864 865 if (comp.isMixingNeeded()) { 866 if (needHiding) { 867 comp.mixOnHiding(comp.isLightweight()); 868 } 869 if (needShowing) { 870 comp.mixOnShowing(); 871 } 872 } 873 } 874 } 875 876 public void setGraphicsConfiguration(Component comp, 877 GraphicsConfiguration gc) 878 { 879 comp.setGraphicsConfiguration(gc); 880 } 881 public boolean requestFocus(Component comp, CausedFocusEvent.Cause cause) { 882 return comp.requestFocus(cause); 883 } 884 public boolean canBeFocusOwner(Component comp) { 885 return comp.canBeFocusOwner(); 886 } 887 888 public boolean isVisible(Component comp) { 889 return comp.isVisible_NoClientCode(); 890 } 891 public void setRequestFocusController 892 (RequestFocusController requestController) 893 { 894 Component.setRequestFocusController(requestController); 895 } 896 public AppContext getAppContext(Component comp) { 897 return comp.appContext; 898 } 899 public void setAppContext(Component comp, AppContext appContext) { 900 comp.appContext = appContext; 901 } 902 public Container getParent(Component comp) { 903 return comp.getParent_NoClientCode(); 904 } 905 public void setParent(Component comp, Container parent) { 906 comp.parent = parent; 907 } 908 public void setSize(Component comp, int width, int height) { 909 comp.width = width; 910 comp.height = height; 911 } 912 public Point getLocation(Component comp) { 913 return comp.location_NoClientCode(); 914 } 915 public void setLocation(Component comp, int x, int y) { 916 comp.x = x; 917 comp.y = y; 918 } 919 public boolean isEnabled(Component comp) { 920 return comp.isEnabledImpl(); 921 } 922 public boolean isDisplayable(Component comp) { 923 return comp.peer != null; 924 } 925 public Cursor getCursor(Component comp) { 926 return comp.getCursor_NoClientCode(); 927 } 928 @SuppressWarnings("unchecked") 929 public <T extends ComponentPeer> T getPeer(Component comp) { 930 return (T) comp.peer; 931 } 932 public void setPeer(Component comp, ComponentPeer peer) { 933 comp.peer = peer; 934 } 935 public boolean isLightweight(Component comp) { 936 return (comp.peer instanceof LightweightPeer); 937 } 938 public boolean getIgnoreRepaint(Component comp) { 939 return comp.ignoreRepaint; 940 } 941 public int getWidth(Component comp) { 942 return comp.width; 943 } 944 public int getHeight(Component comp) { 945 return comp.height; 946 } 947 public int getX(Component comp) { 948 return comp.x; 949 } 950 public int getY(Component comp) { 951 return comp.y; 952 } 953 public Color getForeground(Component comp) { 954 return comp.foreground; 955 } 956 public Color getBackground(Component comp) { 957 return comp.background; 958 } 959 public void setBackground(Component comp, Color background) { 960 comp.background = background; 961 } 962 public Font getFont(Component comp) { 963 return comp.getFont_NoClientCode(); 964 } 965 public void processEvent(Component comp, AWTEvent e) { 966 comp.processEvent(e); 967 } 968 969 public AccessControlContext getAccessControlContext(Component comp) { 970 return comp.getAccessControlContext(); 971 } 972 973 public void revalidateSynchronously(Component comp) { 974 comp.revalidateSynchronously(); 975 } 976 977 @Override 978 public void createBufferStrategy(Component comp, int numBuffers, 979 BufferCapabilities caps) throws AWTException { 980 comp.createBufferStrategy(numBuffers, caps); 981 } 982 983 @Override 984 public BufferStrategy getBufferStrategy(Component comp) { 985 return comp.getBufferStrategy(); 986 } 987 }); 988 } 989 990 /** 991 * Constructs a new component. Class <code>Component</code> can be 992 * extended directly to create a lightweight component that does not 993 * utilize an opaque native window. A lightweight component must be 994 * hosted by a native container somewhere higher up in the component 995 * tree (for example, by a <code>Frame</code> object). 996 */ 997 protected Component() { 998 appContext = AppContext.getAppContext(); 999 } 1000 1001 @SuppressWarnings({"rawtypes", "unchecked"}) 1002 void initializeFocusTraversalKeys() { 1003 focusTraversalKeys = new Set[3]; 1004 } 1005 1006 /** 1007 * Constructs a name for this component. Called by <code>getName</code> 1008 * when the name is <code>null</code>. 1009 */ 1010 String constructComponentName() { 1011 return null; // For strict compliance with prior platform versions, a Component 1012 // that doesn't set its name should return null from 1013 // getName() 1014 } 1015 1016 /** 1017 * Gets the name of the component. 1018 * @return this component's name 1019 * @see #setName 1020 * @since 1.1 1021 */ 1022 public String getName() { 1023 if (name == null && !nameExplicitlySet) { 1024 synchronized(getObjectLock()) { 1025 if (name == null && !nameExplicitlySet) 1026 name = constructComponentName(); 1027 } 1028 } 1029 return name; 1030 } 1031 1032 /** 1033 * Sets the name of the component to the specified string. 1034 * @param name the string that is to be this 1035 * component's name 1036 * @see #getName 1037 * @since 1.1 1038 */ 1039 public void setName(String name) { 1040 String oldName; 1041 synchronized(getObjectLock()) { 1042 oldName = this.name; 1043 this.name = name; 1044 nameExplicitlySet = true; 1045 } 1046 firePropertyChange("name", oldName, name); 1047 } 1048 1049 /** 1050 * Gets the parent of this component. 1051 * @return the parent container of this component 1052 * @since 1.0 1053 */ 1054 public Container getParent() { 1055 return getParent_NoClientCode(); 1056 } 1057 1058 // NOTE: This method may be called by privileged threads. 1059 // This functionality is implemented in a package-private method 1060 // to insure that it cannot be overridden by client subclasses. 1061 // DO NOT INVOKE CLIENT CODE ON THIS THREAD! 1062 final Container getParent_NoClientCode() { 1063 return parent; 1064 } 1065 1066 // This method is overridden in the Window class to return null, 1067 // because the parent field of the Window object contains 1068 // the owner of the window, not its parent. 1069 Container getContainer() { 1070 return getParent_NoClientCode(); 1071 } 1072 1073 /** 1074 * Associate a <code>DropTarget</code> with this component. 1075 * The <code>Component</code> will receive drops only if it 1076 * is enabled. 1077 * 1078 * @see #isEnabled 1079 * @param dt The DropTarget 1080 */ 1081 1082 public synchronized void setDropTarget(DropTarget dt) { 1083 if (dt == dropTarget || (dropTarget != null && dropTarget.equals(dt))) 1084 return; 1085 1086 DropTarget old; 1087 1088 if ((old = dropTarget) != null) { 1089 dropTarget.removeNotify(); 1090 1091 DropTarget t = dropTarget; 1092 1093 dropTarget = null; 1094 1095 try { 1096 t.setComponent(null); 1097 } catch (IllegalArgumentException iae) { 1098 // ignore it. 1099 } 1100 } 1101 1102 // if we have a new one, and we have a peer, add it! 1103 1104 if ((dropTarget = dt) != null) { 1105 try { 1106 dropTarget.setComponent(this); 1107 dropTarget.addNotify(); 1108 } catch (IllegalArgumentException iae) { 1109 if (old != null) { 1110 try { 1111 old.setComponent(this); 1112 dropTarget.addNotify(); 1113 } catch (IllegalArgumentException iae1) { 1114 // ignore it! 1115 } 1116 } 1117 } 1118 } 1119 } 1120 1121 /** 1122 * Gets the <code>DropTarget</code> associated with this 1123 * <code>Component</code>. 1124 * 1125 * @return the drop target 1126 */ 1127 1128 public synchronized DropTarget getDropTarget() { return dropTarget; } 1129 1130 /** 1131 * Gets the <code>GraphicsConfiguration</code> associated with this 1132 * <code>Component</code>. 1133 * If the <code>Component</code> has not been assigned a specific 1134 * <code>GraphicsConfiguration</code>, 1135 * the <code>GraphicsConfiguration</code> of the 1136 * <code>Component</code> object's top-level container is 1137 * returned. 1138 * If the <code>Component</code> has been created, but not yet added 1139 * to a <code>Container</code>, this method returns <code>null</code>. 1140 * 1141 * @return the <code>GraphicsConfiguration</code> used by this 1142 * <code>Component</code> or <code>null</code> 1143 * @since 1.3 1144 */ 1145 public GraphicsConfiguration getGraphicsConfiguration() { 1146 synchronized(getTreeLock()) { 1147 return getGraphicsConfiguration_NoClientCode(); 1148 } 1149 } 1150 1151 final GraphicsConfiguration getGraphicsConfiguration_NoClientCode() { 1152 return graphicsConfig; 1153 } 1154 1155 void setGraphicsConfiguration(GraphicsConfiguration gc) { 1156 synchronized(getTreeLock()) { 1157 if (updateGraphicsData(gc)) { 1158 removeNotify(); 1159 addNotify(); 1160 } 1161 } 1162 } 1163 1164 boolean updateGraphicsData(GraphicsConfiguration gc) { 1165 checkTreeLock(); 1166 1167 if (graphicsConfig == gc) { 1168 return false; 1169 } 1170 1171 graphicsConfig = gc; 1172 1173 ComponentPeer peer = this.peer; 1174 if (peer != null) { 1175 return peer.updateGraphicsData(gc); 1176 } 1177 return false; 1178 } 1179 1180 /** 1181 * Checks that this component's <code>GraphicsDevice</code> 1182 * <code>idString</code> matches the string argument. 1183 */ 1184 void checkGD(String stringID) { 1185 if (graphicsConfig != null) { 1186 if (!graphicsConfig.getDevice().getIDstring().equals(stringID)) { 1187 throw new IllegalArgumentException( 1188 "adding a container to a container on a different GraphicsDevice"); 1189 } 1190 } 1191 } 1192 1193 /** 1194 * Gets this component's locking object (the object that owns the thread 1195 * synchronization monitor) for AWT component-tree and layout 1196 * operations. 1197 * @return this component's locking object 1198 */ 1199 public final Object getTreeLock() { 1200 return LOCK; 1201 } 1202 1203 final void checkTreeLock() { 1204 if (!Thread.holdsLock(getTreeLock())) { 1205 throw new IllegalStateException("This function should be called while holding treeLock"); 1206 } 1207 } 1208 1209 /** 1210 * Gets the toolkit of this component. Note that 1211 * the frame that contains a component controls which 1212 * toolkit is used by that component. Therefore if the component 1213 * is moved from one frame to another, the toolkit it uses may change. 1214 * @return the toolkit of this component 1215 * @since 1.0 1216 */ 1217 public Toolkit getToolkit() { 1218 return getToolkitImpl(); 1219 } 1220 1221 /* 1222 * This is called by the native code, so client code can't 1223 * be called on the toolkit thread. 1224 */ 1225 final Toolkit getToolkitImpl() { 1226 Container parent = this.parent; 1227 if (parent != null) { 1228 return parent.getToolkitImpl(); 1229 } 1230 return Toolkit.getDefaultToolkit(); 1231 } 1232 1233 final ComponentFactory getComponentFactory() { 1234 final Toolkit toolkit = getToolkit(); 1235 if (toolkit instanceof ComponentFactory) { 1236 return (ComponentFactory) toolkit; 1237 } 1238 throw new AWTError("UI components are unsupported by: " + toolkit); 1239 } 1240 1241 /** 1242 * Determines whether this component is valid. A component is valid 1243 * when it is correctly sized and positioned within its parent 1244 * container and all its children are also valid. 1245 * In order to account for peers' size requirements, components are invalidated 1246 * before they are first shown on the screen. By the time the parent container 1247 * is fully realized, all its components will be valid. 1248 * @return <code>true</code> if the component is valid, <code>false</code> 1249 * otherwise 1250 * @see #validate 1251 * @see #invalidate 1252 * @since 1.0 1253 */ 1254 public boolean isValid() { 1255 return (peer != null) && valid; 1256 } 1257 1258 /** 1259 * Determines whether this component is displayable. A component is 1260 * displayable when it is connected to a native screen resource. 1261 * <p> 1262 * A component is made displayable either when it is added to 1263 * a displayable containment hierarchy or when its containment 1264 * hierarchy is made displayable. 1265 * A containment hierarchy is made displayable when its ancestor 1266 * window is either packed or made visible. 1267 * <p> 1268 * A component is made undisplayable either when it is removed from 1269 * a displayable containment hierarchy or when its containment hierarchy 1270 * is made undisplayable. A containment hierarchy is made 1271 * undisplayable when its ancestor window is disposed. 1272 * 1273 * @return <code>true</code> if the component is displayable, 1274 * <code>false</code> otherwise 1275 * @see Container#add(Component) 1276 * @see Window#pack 1277 * @see Window#show 1278 * @see Container#remove(Component) 1279 * @see Window#dispose 1280 * @since 1.2 1281 */ 1282 public boolean isDisplayable() { 1283 return peer != null; 1284 } 1285 1286 /** 1287 * Determines whether this component should be visible when its 1288 * parent is visible. Components are 1289 * initially visible, with the exception of top level components such 1290 * as <code>Frame</code> objects. 1291 * @return <code>true</code> if the component is visible, 1292 * <code>false</code> otherwise 1293 * @see #setVisible 1294 * @since 1.0 1295 */ 1296 @Transient 1297 public boolean isVisible() { 1298 return isVisible_NoClientCode(); 1299 } 1300 final boolean isVisible_NoClientCode() { 1301 return visible; 1302 } 1303 1304 /** 1305 * Determines whether this component will be displayed on the screen. 1306 * @return <code>true</code> if the component and all of its ancestors 1307 * until a toplevel window or null parent are visible, 1308 * <code>false</code> otherwise 1309 */ 1310 boolean isRecursivelyVisible() { 1311 return visible && (parent == null || parent.isRecursivelyVisible()); 1312 } 1313 1314 /** 1315 * Determines the bounds of a visible part of the component relative to its 1316 * parent. 1317 * 1318 * @return the visible part of bounds 1319 */ 1320 private Rectangle getRecursivelyVisibleBounds() { 1321 final Component container = getContainer(); 1322 final Rectangle bounds = getBounds(); 1323 if (container == null) { 1324 // we are top level window or haven't a container, return our bounds 1325 return bounds; 1326 } 1327 // translate the container's bounds to our coordinate space 1328 final Rectangle parentsBounds = container.getRecursivelyVisibleBounds(); 1329 parentsBounds.setLocation(0, 0); 1330 return parentsBounds.intersection(bounds); 1331 } 1332 1333 /** 1334 * Translates absolute coordinates into coordinates in the coordinate 1335 * space of this component. 1336 */ 1337 Point pointRelativeToComponent(Point absolute) { 1338 Point compCoords = getLocationOnScreen(); 1339 return new Point(absolute.x - compCoords.x, 1340 absolute.y - compCoords.y); 1341 } 1342 1343 /** 1344 * Assuming that mouse location is stored in PointerInfo passed 1345 * to this method, it finds a Component that is in the same 1346 * Window as this Component and is located under the mouse pointer. 1347 * If no such Component exists, null is returned. 1348 * NOTE: this method should be called under the protection of 1349 * tree lock, as it is done in Component.getMousePosition() and 1350 * Container.getMousePosition(boolean). 1351 */ 1352 Component findUnderMouseInWindow(PointerInfo pi) { 1353 if (!isShowing()) { 1354 return null; 1355 } 1356 Window win = getContainingWindow(); 1357 Toolkit toolkit = Toolkit.getDefaultToolkit(); 1358 if (!(toolkit instanceof ComponentFactory)) { 1359 return null; 1360 } 1361 if (!((ComponentFactory) toolkit).getMouseInfoPeer().isWindowUnderMouse(win)) { 1362 return null; 1363 } 1364 final boolean INCLUDE_DISABLED = true; 1365 Point relativeToWindow = win.pointRelativeToComponent(pi.getLocation()); 1366 Component inTheSameWindow = win.findComponentAt(relativeToWindow.x, 1367 relativeToWindow.y, 1368 INCLUDE_DISABLED); 1369 return inTheSameWindow; 1370 } 1371 1372 /** 1373 * Returns the position of the mouse pointer in this <code>Component</code>'s 1374 * coordinate space if the <code>Component</code> is directly under the mouse 1375 * pointer, otherwise returns <code>null</code>. 1376 * If the <code>Component</code> is not showing on the screen, this method 1377 * returns <code>null</code> even if the mouse pointer is above the area 1378 * where the <code>Component</code> would be displayed. 1379 * If the <code>Component</code> is partially or fully obscured by other 1380 * <code>Component</code>s or native windows, this method returns a non-null 1381 * value only if the mouse pointer is located above the unobscured part of the 1382 * <code>Component</code>. 1383 * <p> 1384 * For <code>Container</code>s it returns a non-null value if the mouse is 1385 * above the <code>Container</code> itself or above any of its descendants. 1386 * Use {@link Container#getMousePosition(boolean)} if you need to exclude children. 1387 * <p> 1388 * Sometimes the exact mouse coordinates are not important, and the only thing 1389 * that matters is whether a specific <code>Component</code> is under the mouse 1390 * pointer. If the return value of this method is <code>null</code>, mouse 1391 * pointer is not directly above the <code>Component</code>. 1392 * 1393 * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true 1394 * @see #isShowing 1395 * @see Container#getMousePosition 1396 * @return mouse coordinates relative to this <code>Component</code>, or null 1397 * @since 1.5 1398 */ 1399 public Point getMousePosition() throws HeadlessException { 1400 if (GraphicsEnvironment.isHeadless()) { 1401 throw new HeadlessException(); 1402 } 1403 1404 PointerInfo pi = java.security.AccessController.doPrivileged( 1405 new java.security.PrivilegedAction<PointerInfo>() { 1406 public PointerInfo run() { 1407 return MouseInfo.getPointerInfo(); 1408 } 1409 } 1410 ); 1411 1412 synchronized (getTreeLock()) { 1413 Component inTheSameWindow = findUnderMouseInWindow(pi); 1414 if (!isSameOrAncestorOf(inTheSameWindow, true)) { 1415 return null; 1416 } 1417 return pointRelativeToComponent(pi.getLocation()); 1418 } 1419 } 1420 1421 /** 1422 * Overridden in Container. Must be called under TreeLock. 1423 */ 1424 boolean isSameOrAncestorOf(Component comp, boolean allowChildren) { 1425 return comp == this; 1426 } 1427 1428 /** 1429 * Determines whether this component is showing on screen. This means 1430 * that the component must be visible, and it must be in a container 1431 * that is visible and showing. 1432 * <p> 1433 * <strong>Note:</strong> sometimes there is no way to detect whether the 1434 * {@code Component} is actually visible to the user. This can happen when: 1435 * <ul> 1436 * <li>the component has been added to a visible {@code ScrollPane} but 1437 * the {@code Component} is not currently in the scroll pane's view port. 1438 * <li>the {@code Component} is obscured by another {@code Component} or 1439 * {@code Container}. 1440 * </ul> 1441 * @return <code>true</code> if the component is showing, 1442 * <code>false</code> otherwise 1443 * @see #setVisible 1444 * @since 1.0 1445 */ 1446 public boolean isShowing() { 1447 if (visible && (peer != null)) { 1448 Container parent = this.parent; 1449 return (parent == null) || parent.isShowing(); 1450 } 1451 return false; 1452 } 1453 1454 /** 1455 * Determines whether this component is enabled. An enabled component 1456 * can respond to user input and generate events. Components are 1457 * enabled initially by default. A component may be enabled or disabled by 1458 * calling its <code>setEnabled</code> method. 1459 * @return <code>true</code> if the component is enabled, 1460 * <code>false</code> otherwise 1461 * @see #setEnabled 1462 * @since 1.0 1463 */ 1464 public boolean isEnabled() { 1465 return isEnabledImpl(); 1466 } 1467 1468 /* 1469 * This is called by the native code, so client code can't 1470 * be called on the toolkit thread. 1471 */ 1472 final boolean isEnabledImpl() { 1473 return enabled; 1474 } 1475 1476 /** 1477 * Enables or disables this component, depending on the value of the 1478 * parameter <code>b</code>. An enabled component can respond to user 1479 * input and generate events. Components are enabled initially by default. 1480 * 1481 * <p>Note: Disabling a lightweight component does not prevent it from 1482 * receiving MouseEvents. 1483 * <p>Note: Disabling a heavyweight container prevents all components 1484 * in this container from receiving any input events. But disabling a 1485 * lightweight container affects only this container. 1486 * 1487 * @param b If <code>true</code>, this component is 1488 * enabled; otherwise this component is disabled 1489 * @see #isEnabled 1490 * @see #isLightweight 1491 * @since 1.1 1492 */ 1493 public void setEnabled(boolean b) { 1494 enable(b); 1495 } 1496 1497 /** 1498 * @deprecated As of JDK version 1.1, 1499 * replaced by <code>setEnabled(boolean)</code>. 1500 */ 1501 @Deprecated 1502 public void enable() { 1503 if (!enabled) { 1504 synchronized (getTreeLock()) { 1505 enabled = true; 1506 ComponentPeer peer = this.peer; 1507 if (peer != null) { 1508 peer.setEnabled(true); 1509 if (visible && !getRecursivelyVisibleBounds().isEmpty()) { 1510 updateCursorImmediately(); 1511 } 1512 } 1513 } 1514 if (accessibleContext != null) { 1515 accessibleContext.firePropertyChange( 1516 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 1517 null, AccessibleState.ENABLED); 1518 } 1519 } 1520 } 1521 1522 /** 1523 * Enables or disables this component. 1524 * 1525 * @param b {@code true} to enable this component; 1526 * otherwise {@code false} 1527 * 1528 * @deprecated As of JDK version 1.1, 1529 * replaced by <code>setEnabled(boolean)</code>. 1530 */ 1531 @Deprecated 1532 public void enable(boolean b) { 1533 if (b) { 1534 enable(); 1535 } else { 1536 disable(); 1537 } 1538 } 1539 1540 /** 1541 * @deprecated As of JDK version 1.1, 1542 * replaced by <code>setEnabled(boolean)</code>. 1543 */ 1544 @Deprecated 1545 public void disable() { 1546 if (enabled) { 1547 KeyboardFocusManager.clearMostRecentFocusOwner(this); 1548 synchronized (getTreeLock()) { 1549 enabled = false; 1550 // A disabled lw container is allowed to contain a focus owner. 1551 if ((isFocusOwner() || (containsFocus() && !isLightweight())) && 1552 KeyboardFocusManager.isAutoFocusTransferEnabled()) 1553 { 1554 // Don't clear the global focus owner. If transferFocus 1555 // fails, we want the focus to stay on the disabled 1556 // Component so that keyboard traversal, et. al. still 1557 // makes sense to the user. 1558 transferFocus(false); 1559 } 1560 ComponentPeer peer = this.peer; 1561 if (peer != null) { 1562 peer.setEnabled(false); 1563 if (visible && !getRecursivelyVisibleBounds().isEmpty()) { 1564 updateCursorImmediately(); 1565 } 1566 } 1567 } 1568 if (accessibleContext != null) { 1569 accessibleContext.firePropertyChange( 1570 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 1571 null, AccessibleState.ENABLED); 1572 } 1573 } 1574 } 1575 1576 /** 1577 * Returns true if this component is painted to an offscreen image 1578 * ("buffer") that's copied to the screen later. Component 1579 * subclasses that support double buffering should override this 1580 * method to return true if double buffering is enabled. 1581 * 1582 * @return false by default 1583 */ 1584 public boolean isDoubleBuffered() { 1585 return false; 1586 } 1587 1588 /** 1589 * Enables or disables input method support for this component. If input 1590 * method support is enabled and the component also processes key events, 1591 * incoming events are offered to 1592 * the current input method and will only be processed by the component or 1593 * dispatched to its listeners if the input method does not consume them. 1594 * By default, input method support is enabled. 1595 * 1596 * @param enable true to enable, false to disable 1597 * @see #processKeyEvent 1598 * @since 1.2 1599 */ 1600 public void enableInputMethods(boolean enable) { 1601 if (enable) { 1602 if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) 1603 return; 1604 1605 // If this component already has focus, then activate the 1606 // input method by dispatching a synthesized focus gained 1607 // event. 1608 if (isFocusOwner()) { 1609 InputContext inputContext = getInputContext(); 1610 if (inputContext != null) { 1611 FocusEvent focusGainedEvent = 1612 new FocusEvent(this, FocusEvent.FOCUS_GAINED); 1613 inputContext.dispatchEvent(focusGainedEvent); 1614 } 1615 } 1616 1617 eventMask |= AWTEvent.INPUT_METHODS_ENABLED_MASK; 1618 } else { 1619 if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) { 1620 InputContext inputContext = getInputContext(); 1621 if (inputContext != null) { 1622 inputContext.endComposition(); 1623 inputContext.removeNotify(this); 1624 } 1625 } 1626 eventMask &= ~AWTEvent.INPUT_METHODS_ENABLED_MASK; 1627 } 1628 } 1629 1630 /** 1631 * Shows or hides this component depending on the value of parameter 1632 * <code>b</code>. 1633 * <p> 1634 * This method changes layout-related information, and therefore, 1635 * invalidates the component hierarchy. 1636 * 1637 * @param b if <code>true</code>, shows this component; 1638 * otherwise, hides this component 1639 * @see #isVisible 1640 * @see #invalidate 1641 * @since 1.1 1642 */ 1643 public void setVisible(boolean b) { 1644 show(b); 1645 } 1646 1647 /** 1648 * @deprecated As of JDK version 1.1, 1649 * replaced by <code>setVisible(boolean)</code>. 1650 */ 1651 @Deprecated 1652 public void show() { 1653 if (!visible) { 1654 synchronized (getTreeLock()) { 1655 visible = true; 1656 mixOnShowing(); 1657 ComponentPeer peer = this.peer; 1658 if (peer != null) { 1659 peer.setVisible(true); 1660 createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED, 1661 this, parent, 1662 HierarchyEvent.SHOWING_CHANGED, 1663 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)); 1664 if (peer instanceof LightweightPeer) { 1665 repaint(); 1666 } 1667 updateCursorImmediately(); 1668 } 1669 1670 if (componentListener != null || 1671 (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 || 1672 Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) { 1673 ComponentEvent e = new ComponentEvent(this, 1674 ComponentEvent.COMPONENT_SHOWN); 1675 Toolkit.getEventQueue().postEvent(e); 1676 } 1677 } 1678 Container parent = this.parent; 1679 if (parent != null) { 1680 parent.invalidate(); 1681 } 1682 } 1683 } 1684 1685 /** 1686 * Makes this component visible or invisible. 1687 * 1688 * @param b {@code true} to make this component visible; 1689 * otherwise {@code false} 1690 * 1691 * @deprecated As of JDK version 1.1, 1692 * replaced by <code>setVisible(boolean)</code>. 1693 */ 1694 @Deprecated 1695 public void show(boolean b) { 1696 if (b) { 1697 show(); 1698 } else { 1699 hide(); 1700 } 1701 } 1702 1703 boolean containsFocus() { 1704 return isFocusOwner(); 1705 } 1706 1707 void clearMostRecentFocusOwnerOnHide() { 1708 KeyboardFocusManager.clearMostRecentFocusOwner(this); 1709 } 1710 1711 void clearCurrentFocusCycleRootOnHide() { 1712 /* do nothing */ 1713 } 1714 1715 /** 1716 * @deprecated As of JDK version 1.1, 1717 * replaced by <code>setVisible(boolean)</code>. 1718 */ 1719 @Deprecated 1720 public void hide() { 1721 isPacked = false; 1722 1723 if (visible) { 1724 clearCurrentFocusCycleRootOnHide(); 1725 clearMostRecentFocusOwnerOnHide(); 1726 synchronized (getTreeLock()) { 1727 visible = false; 1728 mixOnHiding(isLightweight()); 1729 if (containsFocus() && KeyboardFocusManager.isAutoFocusTransferEnabled()) { 1730 transferFocus(true); 1731 } 1732 ComponentPeer peer = this.peer; 1733 if (peer != null) { 1734 peer.setVisible(false); 1735 createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED, 1736 this, parent, 1737 HierarchyEvent.SHOWING_CHANGED, 1738 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)); 1739 if (peer instanceof LightweightPeer) { 1740 repaint(); 1741 } 1742 updateCursorImmediately(); 1743 } 1744 if (componentListener != null || 1745 (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 || 1746 Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) { 1747 ComponentEvent e = new ComponentEvent(this, 1748 ComponentEvent.COMPONENT_HIDDEN); 1749 Toolkit.getEventQueue().postEvent(e); 1750 } 1751 } 1752 Container parent = this.parent; 1753 if (parent != null) { 1754 parent.invalidate(); 1755 } 1756 } 1757 } 1758 1759 /** 1760 * Gets the foreground color of this component. 1761 * @return this component's foreground color; if this component does 1762 * not have a foreground color, the foreground color of its parent 1763 * is returned 1764 * @see #setForeground 1765 * @since 1.0 1766 * @beaninfo 1767 * bound: true 1768 */ 1769 @Transient 1770 public Color getForeground() { 1771 Color foreground = this.foreground; 1772 if (foreground != null) { 1773 return foreground; 1774 } 1775 Container parent = this.parent; 1776 return (parent != null) ? parent.getForeground() : null; 1777 } 1778 1779 /** 1780 * Sets the foreground color of this component. 1781 * @param c the color to become this component's 1782 * foreground color; if this parameter is <code>null</code> 1783 * then this component will inherit 1784 * the foreground color of its parent 1785 * @see #getForeground 1786 * @since 1.0 1787 */ 1788 public void setForeground(Color c) { 1789 Color oldColor = foreground; 1790 ComponentPeer peer = this.peer; 1791 foreground = c; 1792 if (peer != null) { 1793 c = getForeground(); 1794 if (c != null) { 1795 peer.setForeground(c); 1796 } 1797 } 1798 // This is a bound property, so report the change to 1799 // any registered listeners. (Cheap if there are none.) 1800 firePropertyChange("foreground", oldColor, c); 1801 } 1802 1803 /** 1804 * Returns whether the foreground color has been explicitly set for this 1805 * Component. If this method returns <code>false</code>, this Component is 1806 * inheriting its foreground color from an ancestor. 1807 * 1808 * @return <code>true</code> if the foreground color has been explicitly 1809 * set for this Component; <code>false</code> otherwise. 1810 * @since 1.4 1811 */ 1812 public boolean isForegroundSet() { 1813 return (foreground != null); 1814 } 1815 1816 /** 1817 * Gets the background color of this component. 1818 * @return this component's background color; if this component does 1819 * not have a background color, 1820 * the background color of its parent is returned 1821 * @see #setBackground 1822 * @since 1.0 1823 */ 1824 @Transient 1825 public Color getBackground() { 1826 Color background = this.background; 1827 if (background != null) { 1828 return background; 1829 } 1830 Container parent = this.parent; 1831 return (parent != null) ? parent.getBackground() : null; 1832 } 1833 1834 /** 1835 * Sets the background color of this component. 1836 * <p> 1837 * The background color affects each component differently and the 1838 * parts of the component that are affected by the background color 1839 * may differ between operating systems. 1840 * 1841 * @param c the color to become this component's color; 1842 * if this parameter is <code>null</code>, then this 1843 * component will inherit the background color of its parent 1844 * @see #getBackground 1845 * @since 1.0 1846 * @beaninfo 1847 * bound: true 1848 */ 1849 public void setBackground(Color c) { 1850 Color oldColor = background; 1851 ComponentPeer peer = this.peer; 1852 background = c; 1853 if (peer != null) { 1854 c = getBackground(); 1855 if (c != null) { 1856 peer.setBackground(c); 1857 } 1858 } 1859 // This is a bound property, so report the change to 1860 // any registered listeners. (Cheap if there are none.) 1861 firePropertyChange("background", oldColor, c); 1862 } 1863 1864 /** 1865 * Returns whether the background color has been explicitly set for this 1866 * Component. If this method returns <code>false</code>, this Component is 1867 * inheriting its background color from an ancestor. 1868 * 1869 * @return <code>true</code> if the background color has been explicitly 1870 * set for this Component; <code>false</code> otherwise. 1871 * @since 1.4 1872 */ 1873 public boolean isBackgroundSet() { 1874 return (background != null); 1875 } 1876 1877 /** 1878 * Gets the font of this component. 1879 * @return this component's font; if a font has not been set 1880 * for this component, the font of its parent is returned 1881 * @see #setFont 1882 * @since 1.0 1883 */ 1884 @Transient 1885 public Font getFont() { 1886 return getFont_NoClientCode(); 1887 } 1888 1889 // NOTE: This method may be called by privileged threads. 1890 // This functionality is implemented in a package-private method 1891 // to insure that it cannot be overridden by client subclasses. 1892 // DO NOT INVOKE CLIENT CODE ON THIS THREAD! 1893 final Font getFont_NoClientCode() { 1894 Font font = this.font; 1895 if (font != null) { 1896 return font; 1897 } 1898 Container parent = this.parent; 1899 return (parent != null) ? parent.getFont_NoClientCode() : null; 1900 } 1901 1902 /** 1903 * Sets the font of this component. 1904 * <p> 1905 * This method changes layout-related information, and therefore, 1906 * invalidates the component hierarchy. 1907 * 1908 * @param f the font to become this component's font; 1909 * if this parameter is <code>null</code> then this 1910 * component will inherit the font of its parent 1911 * @see #getFont 1912 * @see #invalidate 1913 * @since 1.0 1914 * @beaninfo 1915 * bound: true 1916 */ 1917 public void setFont(Font f) { 1918 Font oldFont, newFont; 1919 synchronized(getTreeLock()) { 1920 oldFont = font; 1921 newFont = font = f; 1922 ComponentPeer peer = this.peer; 1923 if (peer != null) { 1924 f = getFont(); 1925 if (f != null) { 1926 peer.setFont(f); 1927 peerFont = f; 1928 } 1929 } 1930 } 1931 // This is a bound property, so report the change to 1932 // any registered listeners. (Cheap if there are none.) 1933 firePropertyChange("font", oldFont, newFont); 1934 1935 // This could change the preferred size of the Component. 1936 // Fix for 6213660. Should compare old and new fonts and do not 1937 // call invalidate() if they are equal. 1938 if (f != oldFont && (oldFont == null || 1939 !oldFont.equals(f))) { 1940 invalidateIfValid(); 1941 } 1942 } 1943 1944 /** 1945 * Returns whether the font has been explicitly set for this Component. If 1946 * this method returns <code>false</code>, this Component is inheriting its 1947 * font from an ancestor. 1948 * 1949 * @return <code>true</code> if the font has been explicitly set for this 1950 * Component; <code>false</code> otherwise. 1951 * @since 1.4 1952 */ 1953 public boolean isFontSet() { 1954 return (font != null); 1955 } 1956 1957 /** 1958 * Gets the locale of this component. 1959 * @return this component's locale; if this component does not 1960 * have a locale, the locale of its parent is returned 1961 * @see #setLocale 1962 * @exception IllegalComponentStateException if the <code>Component</code> 1963 * does not have its own locale and has not yet been added to 1964 * a containment hierarchy such that the locale can be determined 1965 * from the containing parent 1966 * @since 1.1 1967 */ 1968 public Locale getLocale() { 1969 Locale locale = this.locale; 1970 if (locale != null) { 1971 return locale; 1972 } 1973 Container parent = this.parent; 1974 1975 if (parent == null) { 1976 throw new IllegalComponentStateException("This component must have a parent in order to determine its locale"); 1977 } else { 1978 return parent.getLocale(); 1979 } 1980 } 1981 1982 /** 1983 * Sets the locale of this component. This is a bound property. 1984 * <p> 1985 * This method changes layout-related information, and therefore, 1986 * invalidates the component hierarchy. 1987 * 1988 * @param l the locale to become this component's locale 1989 * @see #getLocale 1990 * @see #invalidate 1991 * @since 1.1 1992 */ 1993 public void setLocale(Locale l) { 1994 Locale oldValue = locale; 1995 locale = l; 1996 1997 // This is a bound property, so report the change to 1998 // any registered listeners. (Cheap if there are none.) 1999 firePropertyChange("locale", oldValue, l); 2000 2001 // This could change the preferred size of the Component. 2002 invalidateIfValid(); 2003 } 2004 2005 /** 2006 * Gets the instance of <code>ColorModel</code> used to display 2007 * the component on the output device. 2008 * @return the color model used by this component 2009 * @see java.awt.image.ColorModel 2010 * @see java.awt.peer.ComponentPeer#getColorModel() 2011 * @see Toolkit#getColorModel() 2012 * @since 1.0 2013 */ 2014 public ColorModel getColorModel() { 2015 ComponentPeer peer = this.peer; 2016 if ((peer != null) && ! (peer instanceof LightweightPeer)) { 2017 return peer.getColorModel(); 2018 } else if (GraphicsEnvironment.isHeadless()) { 2019 return ColorModel.getRGBdefault(); 2020 } // else 2021 return getToolkit().getColorModel(); 2022 } 2023 2024 /** 2025 * Gets the location of this component in the form of a 2026 * point specifying the component's top-left corner. 2027 * The location will be relative to the parent's coordinate space. 2028 * <p> 2029 * Due to the asynchronous nature of native event handling, this 2030 * method can return outdated values (for instance, after several calls 2031 * of <code>setLocation()</code> in rapid succession). For this 2032 * reason, the recommended method of obtaining a component's position is 2033 * within <code>java.awt.event.ComponentListener.componentMoved()</code>, 2034 * which is called after the operating system has finished moving the 2035 * component. 2036 * </p> 2037 * @return an instance of <code>Point</code> representing 2038 * the top-left corner of the component's bounds in 2039 * the coordinate space of the component's parent 2040 * @see #setLocation 2041 * @see #getLocationOnScreen 2042 * @since 1.1 2043 */ 2044 public Point getLocation() { 2045 return location(); 2046 } 2047 2048 /** 2049 * Gets the location of this component in the form of a point 2050 * specifying the component's top-left corner in the screen's 2051 * coordinate space. 2052 * @return an instance of <code>Point</code> representing 2053 * the top-left corner of the component's bounds in the 2054 * coordinate space of the screen 2055 * @throws IllegalComponentStateException if the 2056 * component is not showing on the screen 2057 * @see #setLocation 2058 * @see #getLocation 2059 */ 2060 public Point getLocationOnScreen() { 2061 synchronized (getTreeLock()) { 2062 return getLocationOnScreen_NoTreeLock(); 2063 } 2064 } 2065 2066 /* 2067 * a package private version of getLocationOnScreen 2068 * used by GlobalCursormanager to update cursor 2069 */ 2070 final Point getLocationOnScreen_NoTreeLock() { 2071 2072 if (peer != null && isShowing()) { 2073 if (peer instanceof LightweightPeer) { 2074 // lightweight component location needs to be translated 2075 // relative to a native component. 2076 Container host = getNativeContainer(); 2077 Point pt = host.peer.getLocationOnScreen(); 2078 for(Component c = this; c != host; c = c.getParent()) { 2079 pt.x += c.x; 2080 pt.y += c.y; 2081 } 2082 return pt; 2083 } else { 2084 Point pt = peer.getLocationOnScreen(); 2085 return pt; 2086 } 2087 } else { 2088 throw new IllegalComponentStateException("component must be showing on the screen to determine its location"); 2089 } 2090 } 2091 2092 2093 /** 2094 * Returns the location of this component's top left corner. 2095 * 2096 * @return the location of this component's top left corner 2097 * @deprecated As of JDK version 1.1, 2098 * replaced by <code>getLocation()</code>. 2099 */ 2100 @Deprecated 2101 public Point location() { 2102 return location_NoClientCode(); 2103 } 2104 2105 private Point location_NoClientCode() { 2106 return new Point(x, y); 2107 } 2108 2109 /** 2110 * Moves this component to a new location. The top-left corner of 2111 * the new location is specified by the <code>x</code> and <code>y</code> 2112 * parameters in the coordinate space of this component's parent. 2113 * <p> 2114 * This method changes layout-related information, and therefore, 2115 * invalidates the component hierarchy. 2116 * 2117 * @param x the <i>x</i>-coordinate of the new location's 2118 * top-left corner in the parent's coordinate space 2119 * @param y the <i>y</i>-coordinate of the new location's 2120 * top-left corner in the parent's coordinate space 2121 * @see #getLocation 2122 * @see #setBounds 2123 * @see #invalidate 2124 * @since 1.1 2125 */ 2126 public void setLocation(int x, int y) { 2127 move(x, y); 2128 } 2129 2130 /** 2131 * Moves this component to a new location. 2132 * 2133 * @param x the <i>x</i>-coordinate of the new location's 2134 * top-left corner in the parent's coordinate space 2135 * @param y the <i>y</i>-coordinate of the new location's 2136 * top-left corner in the parent's coordinate space 2137 * 2138 * @deprecated As of JDK version 1.1, 2139 * replaced by <code>setLocation(int, int)</code>. 2140 */ 2141 @Deprecated 2142 public void move(int x, int y) { 2143 synchronized(getTreeLock()) { 2144 setBoundsOp(ComponentPeer.SET_LOCATION); 2145 setBounds(x, y, width, height); 2146 } 2147 } 2148 2149 /** 2150 * Moves this component to a new location. The top-left corner of 2151 * the new location is specified by point <code>p</code>. Point 2152 * <code>p</code> is given in the parent's coordinate space. 2153 * <p> 2154 * This method changes layout-related information, and therefore, 2155 * invalidates the component hierarchy. 2156 * 2157 * @param p the point defining the top-left corner 2158 * of the new location, given in the coordinate space of this 2159 * component's parent 2160 * @see #getLocation 2161 * @see #setBounds 2162 * @see #invalidate 2163 * @since 1.1 2164 */ 2165 public void setLocation(Point p) { 2166 setLocation(p.x, p.y); 2167 } 2168 2169 /** 2170 * Returns the size of this component in the form of a 2171 * <code>Dimension</code> object. The <code>height</code> 2172 * field of the <code>Dimension</code> object contains 2173 * this component's height, and the <code>width</code> 2174 * field of the <code>Dimension</code> object contains 2175 * this component's width. 2176 * @return a <code>Dimension</code> object that indicates the 2177 * size of this component 2178 * @see #setSize 2179 * @since 1.1 2180 */ 2181 public Dimension getSize() { 2182 return size(); 2183 } 2184 2185 /** 2186 * Returns the size of this component in the form of a 2187 * {@code Dimension} object. 2188 * 2189 * @return the {@code Dimension} object that indicates the 2190 * size of this component 2191 * @deprecated As of JDK version 1.1, 2192 * replaced by <code>getSize()</code>. 2193 */ 2194 @Deprecated 2195 public Dimension size() { 2196 return new Dimension(width, height); 2197 } 2198 2199 /** 2200 * Resizes this component so that it has width <code>width</code> 2201 * and height <code>height</code>. 2202 * <p> 2203 * This method changes layout-related information, and therefore, 2204 * invalidates the component hierarchy. 2205 * 2206 * @param width the new width of this component in pixels 2207 * @param height the new height of this component in pixels 2208 * @see #getSize 2209 * @see #setBounds 2210 * @see #invalidate 2211 * @since 1.1 2212 */ 2213 public void setSize(int width, int height) { 2214 resize(width, height); 2215 } 2216 2217 /** 2218 * Resizes this component. 2219 * 2220 * @param width the new width of the component 2221 * @param height the new height of the component 2222 * @deprecated As of JDK version 1.1, 2223 * replaced by <code>setSize(int, int)</code>. 2224 */ 2225 @Deprecated 2226 public void resize(int width, int height) { 2227 synchronized(getTreeLock()) { 2228 setBoundsOp(ComponentPeer.SET_SIZE); 2229 setBounds(x, y, width, height); 2230 } 2231 } 2232 2233 /** 2234 * Resizes this component so that it has width <code>d.width</code> 2235 * and height <code>d.height</code>. 2236 * <p> 2237 * This method changes layout-related information, and therefore, 2238 * invalidates the component hierarchy. 2239 * 2240 * @param d the dimension specifying the new size 2241 * of this component 2242 * @throws NullPointerException if {@code d} is {@code null} 2243 * @see #setSize 2244 * @see #setBounds 2245 * @see #invalidate 2246 * @since 1.1 2247 */ 2248 public void setSize(Dimension d) { 2249 resize(d); 2250 } 2251 2252 /** 2253 * Resizes this component so that it has width {@code d.width} 2254 * and height {@code d.height}. 2255 * 2256 * @param d the new size of this component 2257 * @deprecated As of JDK version 1.1, 2258 * replaced by <code>setSize(Dimension)</code>. 2259 */ 2260 @Deprecated 2261 public void resize(Dimension d) { 2262 setSize(d.width, d.height); 2263 } 2264 2265 /** 2266 * Gets the bounds of this component in the form of a 2267 * <code>Rectangle</code> object. The bounds specify this 2268 * component's width, height, and location relative to 2269 * its parent. 2270 * @return a rectangle indicating this component's bounds 2271 * @see #setBounds 2272 * @see #getLocation 2273 * @see #getSize 2274 */ 2275 public Rectangle getBounds() { 2276 return bounds(); 2277 } 2278 2279 /** 2280 * Returns the bounding rectangle of this component. 2281 * 2282 * @return the bounding rectangle for this component 2283 * @deprecated As of JDK version 1.1, 2284 * replaced by <code>getBounds()</code>. 2285 */ 2286 @Deprecated 2287 public Rectangle bounds() { 2288 return new Rectangle(x, y, width, height); 2289 } 2290 2291 /** 2292 * Moves and resizes this component. The new location of the top-left 2293 * corner is specified by <code>x</code> and <code>y</code>, and the 2294 * new size is specified by <code>width</code> and <code>height</code>. 2295 * <p> 2296 * This method changes layout-related information, and therefore, 2297 * invalidates the component hierarchy. 2298 * 2299 * @param x the new <i>x</i>-coordinate of this component 2300 * @param y the new <i>y</i>-coordinate of this component 2301 * @param width the new <code>width</code> of this component 2302 * @param height the new <code>height</code> of this 2303 * component 2304 * @see #getBounds 2305 * @see #setLocation(int, int) 2306 * @see #setLocation(Point) 2307 * @see #setSize(int, int) 2308 * @see #setSize(Dimension) 2309 * @see #invalidate 2310 * @since 1.1 2311 */ 2312 public void setBounds(int x, int y, int width, int height) { 2313 reshape(x, y, width, height); 2314 } 2315 2316 /** 2317 * Reshapes the bounding rectangle for this component. 2318 * 2319 * @param x the <i>x</i> coordinate of the upper left corner of the rectangle 2320 * @param y the <i>y</i> coordinate of the upper left corner of the rectangle 2321 * @param width the width of the rectangle 2322 * @param height the height of the rectangle 2323 * 2324 * @deprecated As of JDK version 1.1, 2325 * replaced by <code>setBounds(int, int, int, int)</code>. 2326 */ 2327 @Deprecated 2328 public void reshape(int x, int y, int width, int height) { 2329 synchronized (getTreeLock()) { 2330 try { 2331 setBoundsOp(ComponentPeer.SET_BOUNDS); 2332 boolean resized = (this.width != width) || (this.height != height); 2333 boolean moved = (this.x != x) || (this.y != y); 2334 if (!resized && !moved) { 2335 return; 2336 } 2337 int oldX = this.x; 2338 int oldY = this.y; 2339 int oldWidth = this.width; 2340 int oldHeight = this.height; 2341 this.x = x; 2342 this.y = y; 2343 this.width = width; 2344 this.height = height; 2345 2346 if (resized) { 2347 isPacked = false; 2348 } 2349 2350 boolean needNotify = true; 2351 mixOnReshaping(); 2352 if (peer != null) { 2353 // LightweightPeer is an empty stub so can skip peer.reshape 2354 if (!(peer instanceof LightweightPeer)) { 2355 reshapeNativePeer(x, y, width, height, getBoundsOp()); 2356 // Check peer actually changed coordinates 2357 resized = (oldWidth != this.width) || (oldHeight != this.height); 2358 moved = (oldX != this.x) || (oldY != this.y); 2359 // fix for 5025858: do not send ComponentEvents for toplevel 2360 // windows here as it is done from peer or native code when 2361 // the window is really resized or moved, otherwise some 2362 // events may be sent twice 2363 if (this instanceof Window) { 2364 needNotify = false; 2365 } 2366 } 2367 if (resized) { 2368 invalidate(); 2369 } 2370 if (parent != null) { 2371 parent.invalidateIfValid(); 2372 } 2373 } 2374 if (needNotify) { 2375 notifyNewBounds(resized, moved); 2376 } 2377 repaintParentIfNeeded(oldX, oldY, oldWidth, oldHeight); 2378 } finally { 2379 setBoundsOp(ComponentPeer.RESET_OPERATION); 2380 } 2381 } 2382 } 2383 2384 private void repaintParentIfNeeded(int oldX, int oldY, int oldWidth, 2385 int oldHeight) 2386 { 2387 if (parent != null && peer instanceof LightweightPeer && isShowing()) { 2388 // Have the parent redraw the area this component occupied. 2389 parent.repaint(oldX, oldY, oldWidth, oldHeight); 2390 // Have the parent redraw the area this component *now* occupies. 2391 repaint(); 2392 } 2393 } 2394 2395 private void reshapeNativePeer(int x, int y, int width, int height, int op) { 2396 // native peer might be offset by more than direct 2397 // parent since parent might be lightweight. 2398 int nativeX = x; 2399 int nativeY = y; 2400 for (Component c = parent; 2401 (c != null) && (c.peer instanceof LightweightPeer); 2402 c = c.parent) 2403 { 2404 nativeX += c.x; 2405 nativeY += c.y; 2406 } 2407 peer.setBounds(nativeX, nativeY, width, height, op); 2408 } 2409 2410 @SuppressWarnings("deprecation") 2411 private void notifyNewBounds(boolean resized, boolean moved) { 2412 if (componentListener != null 2413 || (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 2414 || Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) 2415 { 2416 if (resized) { 2417 ComponentEvent e = new ComponentEvent(this, 2418 ComponentEvent.COMPONENT_RESIZED); 2419 Toolkit.getEventQueue().postEvent(e); 2420 } 2421 if (moved) { 2422 ComponentEvent e = new ComponentEvent(this, 2423 ComponentEvent.COMPONENT_MOVED); 2424 Toolkit.getEventQueue().postEvent(e); 2425 } 2426 } else { 2427 if (this instanceof Container && ((Container)this).countComponents() > 0) { 2428 boolean enabledOnToolkit = 2429 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK); 2430 if (resized) { 2431 2432 ((Container)this).createChildHierarchyEvents( 2433 HierarchyEvent.ANCESTOR_RESIZED, 0, enabledOnToolkit); 2434 } 2435 if (moved) { 2436 ((Container)this).createChildHierarchyEvents( 2437 HierarchyEvent.ANCESTOR_MOVED, 0, enabledOnToolkit); 2438 } 2439 } 2440 } 2441 } 2442 2443 /** 2444 * Moves and resizes this component to conform to the new 2445 * bounding rectangle <code>r</code>. This component's new 2446 * position is specified by <code>r.x</code> and <code>r.y</code>, 2447 * and its new size is specified by <code>r.width</code> and 2448 * <code>r.height</code> 2449 * <p> 2450 * This method changes layout-related information, and therefore, 2451 * invalidates the component hierarchy. 2452 * 2453 * @param r the new bounding rectangle for this component 2454 * @throws NullPointerException if {@code r} is {@code null} 2455 * @see #getBounds 2456 * @see #setLocation(int, int) 2457 * @see #setLocation(Point) 2458 * @see #setSize(int, int) 2459 * @see #setSize(Dimension) 2460 * @see #invalidate 2461 * @since 1.1 2462 */ 2463 public void setBounds(Rectangle r) { 2464 setBounds(r.x, r.y, r.width, r.height); 2465 } 2466 2467 2468 /** 2469 * Returns the current x coordinate of the components origin. 2470 * This method is preferable to writing 2471 * <code>component.getBounds().x</code>, 2472 * or <code>component.getLocation().x</code> because it doesn't 2473 * cause any heap allocations. 2474 * 2475 * @return the current x coordinate of the components origin 2476 * @since 1.2 2477 */ 2478 public int getX() { 2479 return x; 2480 } 2481 2482 2483 /** 2484 * Returns the current y coordinate of the components origin. 2485 * This method is preferable to writing 2486 * <code>component.getBounds().y</code>, 2487 * or <code>component.getLocation().y</code> because it 2488 * doesn't cause any heap allocations. 2489 * 2490 * @return the current y coordinate of the components origin 2491 * @since 1.2 2492 */ 2493 public int getY() { 2494 return y; 2495 } 2496 2497 2498 /** 2499 * Returns the current width of this component. 2500 * This method is preferable to writing 2501 * <code>component.getBounds().width</code>, 2502 * or <code>component.getSize().width</code> because it 2503 * doesn't cause any heap allocations. 2504 * 2505 * @return the current width of this component 2506 * @since 1.2 2507 */ 2508 public int getWidth() { 2509 return width; 2510 } 2511 2512 2513 /** 2514 * Returns the current height of this component. 2515 * This method is preferable to writing 2516 * <code>component.getBounds().height</code>, 2517 * or <code>component.getSize().height</code> because it 2518 * doesn't cause any heap allocations. 2519 * 2520 * @return the current height of this component 2521 * @since 1.2 2522 */ 2523 public int getHeight() { 2524 return height; 2525 } 2526 2527 /** 2528 * Stores the bounds of this component into "return value" <b>rv</b> and 2529 * return <b>rv</b>. If rv is <code>null</code> a new 2530 * <code>Rectangle</code> is allocated. 2531 * This version of <code>getBounds</code> is useful if the caller 2532 * wants to avoid allocating a new <code>Rectangle</code> object 2533 * on the heap. 2534 * 2535 * @param rv the return value, modified to the components bounds 2536 * @return rv 2537 */ 2538 public Rectangle getBounds(Rectangle rv) { 2539 if (rv == null) { 2540 return new Rectangle(getX(), getY(), getWidth(), getHeight()); 2541 } 2542 else { 2543 rv.setBounds(getX(), getY(), getWidth(), getHeight()); 2544 return rv; 2545 } 2546 } 2547 2548 /** 2549 * Stores the width/height of this component into "return value" <b>rv</b> 2550 * and return <b>rv</b>. If rv is <code>null</code> a new 2551 * <code>Dimension</code> object is allocated. This version of 2552 * <code>getSize</code> is useful if the caller wants to avoid 2553 * allocating a new <code>Dimension</code> object on the heap. 2554 * 2555 * @param rv the return value, modified to the components size 2556 * @return rv 2557 */ 2558 public Dimension getSize(Dimension rv) { 2559 if (rv == null) { 2560 return new Dimension(getWidth(), getHeight()); 2561 } 2562 else { 2563 rv.setSize(getWidth(), getHeight()); 2564 return rv; 2565 } 2566 } 2567 2568 /** 2569 * Stores the x,y origin of this component into "return value" <b>rv</b> 2570 * and return <b>rv</b>. If rv is <code>null</code> a new 2571 * <code>Point</code> is allocated. 2572 * This version of <code>getLocation</code> is useful if the 2573 * caller wants to avoid allocating a new <code>Point</code> 2574 * object on the heap. 2575 * 2576 * @param rv the return value, modified to the components location 2577 * @return rv 2578 */ 2579 public Point getLocation(Point rv) { 2580 if (rv == null) { 2581 return new Point(getX(), getY()); 2582 } 2583 else { 2584 rv.setLocation(getX(), getY()); 2585 return rv; 2586 } 2587 } 2588 2589 /** 2590 * Returns true if this component is completely opaque, returns 2591 * false by default. 2592 * <p> 2593 * An opaque component paints every pixel within its 2594 * rectangular region. A non-opaque component paints only some of 2595 * its pixels, allowing the pixels underneath it to "show through". 2596 * A component that does not fully paint its pixels therefore 2597 * provides a degree of transparency. 2598 * <p> 2599 * Subclasses that guarantee to always completely paint their 2600 * contents should override this method and return true. 2601 * 2602 * @return true if this component is completely opaque 2603 * @see #isLightweight 2604 * @since 1.2 2605 */ 2606 public boolean isOpaque() { 2607 if (peer == null) { 2608 return false; 2609 } 2610 else { 2611 return !isLightweight(); 2612 } 2613 } 2614 2615 2616 /** 2617 * A lightweight component doesn't have a native toolkit peer. 2618 * Subclasses of <code>Component</code> and <code>Container</code>, 2619 * other than the ones defined in this package like <code>Button</code> 2620 * or <code>Scrollbar</code>, are lightweight. 2621 * All of the Swing components are lightweights. 2622 * <p> 2623 * This method will always return <code>false</code> if this component 2624 * is not displayable because it is impossible to determine the 2625 * weight of an undisplayable component. 2626 * 2627 * @return true if this component has a lightweight peer; false if 2628 * it has a native peer or no peer 2629 * @see #isDisplayable 2630 * @since 1.2 2631 */ 2632 public boolean isLightweight() { 2633 return peer instanceof LightweightPeer; 2634 } 2635 2636 2637 /** 2638 * Sets the preferred size of this component to a constant 2639 * value. Subsequent calls to <code>getPreferredSize</code> will always 2640 * return this value. Setting the preferred size to <code>null</code> 2641 * restores the default behavior. 2642 * 2643 * @param preferredSize The new preferred size, or null 2644 * @see #getPreferredSize 2645 * @see #isPreferredSizeSet 2646 * @since 1.5 2647 */ 2648 public void setPreferredSize(Dimension preferredSize) { 2649 Dimension old; 2650 // If the preferred size was set, use it as the old value, otherwise 2651 // use null to indicate we didn't previously have a set preferred 2652 // size. 2653 if (prefSizeSet) { 2654 old = this.prefSize; 2655 } 2656 else { 2657 old = null; 2658 } 2659 this.prefSize = preferredSize; 2660 prefSizeSet = (preferredSize != null); 2661 firePropertyChange("preferredSize", old, preferredSize); 2662 } 2663 2664 2665 /** 2666 * Returns true if the preferred size has been set to a 2667 * non-<code>null</code> value otherwise returns false. 2668 * 2669 * @return true if <code>setPreferredSize</code> has been invoked 2670 * with a non-null value. 2671 * @since 1.5 2672 */ 2673 public boolean isPreferredSizeSet() { 2674 return prefSizeSet; 2675 } 2676 2677 2678 /** 2679 * Gets the preferred size of this component. 2680 * @return a dimension object indicating this component's preferred size 2681 * @see #getMinimumSize 2682 * @see LayoutManager 2683 */ 2684 public Dimension getPreferredSize() { 2685 return preferredSize(); 2686 } 2687 2688 2689 /** 2690 * Returns the component's preferred size. 2691 * 2692 * @return the component's preferred size 2693 * @deprecated As of JDK version 1.1, 2694 * replaced by <code>getPreferredSize()</code>. 2695 */ 2696 @Deprecated 2697 public Dimension preferredSize() { 2698 /* Avoid grabbing the lock if a reasonable cached size value 2699 * is available. 2700 */ 2701 Dimension dim = prefSize; 2702 if (dim == null || !(isPreferredSizeSet() || isValid())) { 2703 synchronized (getTreeLock()) { 2704 prefSize = (peer != null) ? 2705 peer.getPreferredSize() : 2706 getMinimumSize(); 2707 dim = prefSize; 2708 } 2709 } 2710 return new Dimension(dim); 2711 } 2712 2713 /** 2714 * Sets the minimum size of this component to a constant 2715 * value. Subsequent calls to <code>getMinimumSize</code> will always 2716 * return this value. Setting the minimum size to <code>null</code> 2717 * restores the default behavior. 2718 * 2719 * @param minimumSize the new minimum size of this component 2720 * @see #getMinimumSize 2721 * @see #isMinimumSizeSet 2722 * @since 1.5 2723 */ 2724 public void setMinimumSize(Dimension minimumSize) { 2725 Dimension old; 2726 // If the minimum size was set, use it as the old value, otherwise 2727 // use null to indicate we didn't previously have a set minimum 2728 // size. 2729 if (minSizeSet) { 2730 old = this.minSize; 2731 } 2732 else { 2733 old = null; 2734 } 2735 this.minSize = minimumSize; 2736 minSizeSet = (minimumSize != null); 2737 firePropertyChange("minimumSize", old, minimumSize); 2738 } 2739 2740 /** 2741 * Returns whether or not <code>setMinimumSize</code> has been 2742 * invoked with a non-null value. 2743 * 2744 * @return true if <code>setMinimumSize</code> has been invoked with a 2745 * non-null value. 2746 * @since 1.5 2747 */ 2748 public boolean isMinimumSizeSet() { 2749 return minSizeSet; 2750 } 2751 2752 /** 2753 * Gets the minimum size of this component. 2754 * @return a dimension object indicating this component's minimum size 2755 * @see #getPreferredSize 2756 * @see LayoutManager 2757 */ 2758 public Dimension getMinimumSize() { 2759 return minimumSize(); 2760 } 2761 2762 /** 2763 * Returns the minimum size of this component. 2764 * 2765 * @return the minimum size of this component 2766 * @deprecated As of JDK version 1.1, 2767 * replaced by <code>getMinimumSize()</code>. 2768 */ 2769 @Deprecated 2770 public Dimension minimumSize() { 2771 /* Avoid grabbing the lock if a reasonable cached size value 2772 * is available. 2773 */ 2774 Dimension dim = minSize; 2775 if (dim == null || !(isMinimumSizeSet() || isValid())) { 2776 synchronized (getTreeLock()) { 2777 minSize = (peer != null) ? 2778 peer.getMinimumSize() : 2779 size(); 2780 dim = minSize; 2781 } 2782 } 2783 return new Dimension(dim); 2784 } 2785 2786 /** 2787 * Sets the maximum size of this component to a constant 2788 * value. Subsequent calls to <code>getMaximumSize</code> will always 2789 * return this value. Setting the maximum size to <code>null</code> 2790 * restores the default behavior. 2791 * 2792 * @param maximumSize a <code>Dimension</code> containing the 2793 * desired maximum allowable size 2794 * @see #getMaximumSize 2795 * @see #isMaximumSizeSet 2796 * @since 1.5 2797 */ 2798 public void setMaximumSize(Dimension maximumSize) { 2799 // If the maximum size was set, use it as the old value, otherwise 2800 // use null to indicate we didn't previously have a set maximum 2801 // size. 2802 Dimension old; 2803 if (maxSizeSet) { 2804 old = this.maxSize; 2805 } 2806 else { 2807 old = null; 2808 } 2809 this.maxSize = maximumSize; 2810 maxSizeSet = (maximumSize != null); 2811 firePropertyChange("maximumSize", old, maximumSize); 2812 } 2813 2814 /** 2815 * Returns true if the maximum size has been set to a non-<code>null</code> 2816 * value otherwise returns false. 2817 * 2818 * @return true if <code>maximumSize</code> is non-<code>null</code>, 2819 * false otherwise 2820 * @since 1.5 2821 */ 2822 public boolean isMaximumSizeSet() { 2823 return maxSizeSet; 2824 } 2825 2826 /** 2827 * Gets the maximum size of this component. 2828 * @return a dimension object indicating this component's maximum size 2829 * @see #getMinimumSize 2830 * @see #getPreferredSize 2831 * @see LayoutManager 2832 */ 2833 public Dimension getMaximumSize() { 2834 if (isMaximumSizeSet()) { 2835 return new Dimension(maxSize); 2836 } 2837 return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE); 2838 } 2839 2840 /** 2841 * Returns the alignment along the x axis. This specifies how 2842 * the component would like to be aligned relative to other 2843 * components. The value should be a number between 0 and 1 2844 * where 0 represents alignment along the origin, 1 is aligned 2845 * the furthest away from the origin, 0.5 is centered, etc. 2846 * 2847 * @return the horizontal alignment of this component 2848 */ 2849 public float getAlignmentX() { 2850 return CENTER_ALIGNMENT; 2851 } 2852 2853 /** 2854 * Returns the alignment along the y axis. This specifies how 2855 * the component would like to be aligned relative to other 2856 * components. The value should be a number between 0 and 1 2857 * where 0 represents alignment along the origin, 1 is aligned 2858 * the furthest away from the origin, 0.5 is centered, etc. 2859 * 2860 * @return the vertical alignment of this component 2861 */ 2862 public float getAlignmentY() { 2863 return CENTER_ALIGNMENT; 2864 } 2865 2866 /** 2867 * Returns the baseline. The baseline is measured from the top of 2868 * the component. This method is primarily meant for 2869 * <code>LayoutManager</code>s to align components along their 2870 * baseline. A return value less than 0 indicates this component 2871 * does not have a reasonable baseline and that 2872 * <code>LayoutManager</code>s should not align this component on 2873 * its baseline. 2874 * <p> 2875 * The default implementation returns -1. Subclasses that support 2876 * baseline should override appropriately. If a value >= 0 is 2877 * returned, then the component has a valid baseline for any 2878 * size >= the minimum size and <code>getBaselineResizeBehavior</code> 2879 * can be used to determine how the baseline changes with size. 2880 * 2881 * @param width the width to get the baseline for 2882 * @param height the height to get the baseline for 2883 * @return the baseline or < 0 indicating there is no reasonable 2884 * baseline 2885 * @throws IllegalArgumentException if width or height is < 0 2886 * @see #getBaselineResizeBehavior 2887 * @see java.awt.FontMetrics 2888 * @since 1.6 2889 */ 2890 public int getBaseline(int width, int height) { 2891 if (width < 0 || height < 0) { 2892 throw new IllegalArgumentException( 2893 "Width and height must be >= 0"); 2894 } 2895 return -1; 2896 } 2897 2898 /** 2899 * Returns an enum indicating how the baseline of the component 2900 * changes as the size changes. This method is primarily meant for 2901 * layout managers and GUI builders. 2902 * <p> 2903 * The default implementation returns 2904 * <code>BaselineResizeBehavior.OTHER</code>. Subclasses that have a 2905 * baseline should override appropriately. Subclasses should 2906 * never return <code>null</code>; if the baseline can not be 2907 * calculated return <code>BaselineResizeBehavior.OTHER</code>. Callers 2908 * should first ask for the baseline using 2909 * <code>getBaseline</code> and if a value >= 0 is returned use 2910 * this method. It is acceptable for this method to return a 2911 * value other than <code>BaselineResizeBehavior.OTHER</code> even if 2912 * <code>getBaseline</code> returns a value less than 0. 2913 * 2914 * @return an enum indicating how the baseline changes as the component 2915 * size changes 2916 * @see #getBaseline(int, int) 2917 * @since 1.6 2918 */ 2919 public BaselineResizeBehavior getBaselineResizeBehavior() { 2920 return BaselineResizeBehavior.OTHER; 2921 } 2922 2923 /** 2924 * Prompts the layout manager to lay out this component. This is 2925 * usually called when the component (more specifically, container) 2926 * is validated. 2927 * @see #validate 2928 * @see LayoutManager 2929 */ 2930 public void doLayout() { 2931 layout(); 2932 } 2933 2934 /** 2935 * @deprecated As of JDK version 1.1, 2936 * replaced by <code>doLayout()</code>. 2937 */ 2938 @Deprecated 2939 public void layout() { 2940 } 2941 2942 /** 2943 * Validates this component. 2944 * <p> 2945 * The meaning of the term <i>validating</i> is defined by the ancestors of 2946 * this class. See {@link Container#validate} for more details. 2947 * 2948 * @see #invalidate 2949 * @see #doLayout() 2950 * @see LayoutManager 2951 * @see Container#validate 2952 * @since 1.0 2953 */ 2954 public void validate() { 2955 synchronized (getTreeLock()) { 2956 ComponentPeer peer = this.peer; 2957 boolean wasValid = isValid(); 2958 if (!wasValid && peer != null) { 2959 Font newfont = getFont(); 2960 Font oldfont = peerFont; 2961 if (newfont != oldfont && (oldfont == null 2962 || !oldfont.equals(newfont))) { 2963 peer.setFont(newfont); 2964 peerFont = newfont; 2965 } 2966 peer.layout(); 2967 } 2968 valid = true; 2969 if (!wasValid) { 2970 mixOnValidating(); 2971 } 2972 } 2973 } 2974 2975 /** 2976 * Invalidates this component and its ancestors. 2977 * <p> 2978 * By default, all the ancestors of the component up to the top-most 2979 * container of the hierarchy are marked invalid. If the {@code 2980 * java.awt.smartInvalidate} system property is set to {@code true}, 2981 * invalidation stops on the nearest validate root of this component. 2982 * Marking a container <i>invalid</i> indicates that the container needs to 2983 * be laid out. 2984 * <p> 2985 * This method is called automatically when any layout-related information 2986 * changes (e.g. setting the bounds of the component, or adding the 2987 * component to a container). 2988 * <p> 2989 * This method might be called often, so it should work fast. 2990 * 2991 * @see #validate 2992 * @see #doLayout 2993 * @see LayoutManager 2994 * @see java.awt.Container#isValidateRoot 2995 * @since 1.0 2996 */ 2997 public void invalidate() { 2998 synchronized (getTreeLock()) { 2999 /* Nullify cached layout and size information. 3000 * For efficiency, propagate invalidate() upwards only if 3001 * some other component hasn't already done so first. 3002 */ 3003 valid = false; 3004 if (!isPreferredSizeSet()) { 3005 prefSize = null; 3006 } 3007 if (!isMinimumSizeSet()) { 3008 minSize = null; 3009 } 3010 if (!isMaximumSizeSet()) { 3011 maxSize = null; 3012 } 3013 invalidateParent(); 3014 } 3015 } 3016 3017 /** 3018 * Invalidates the parent of this component if any. 3019 * 3020 * This method MUST BE invoked under the TreeLock. 3021 */ 3022 void invalidateParent() { 3023 if (parent != null) { 3024 parent.invalidateIfValid(); 3025 } 3026 } 3027 3028 /** Invalidates the component unless it is already invalid. 3029 */ 3030 final void invalidateIfValid() { 3031 if (isValid()) { 3032 invalidate(); 3033 } 3034 } 3035 3036 /** 3037 * Revalidates the component hierarchy up to the nearest validate root. 3038 * <p> 3039 * This method first invalidates the component hierarchy starting from this 3040 * component up to the nearest validate root. Afterwards, the component 3041 * hierarchy is validated starting from the nearest validate root. 3042 * <p> 3043 * This is a convenience method supposed to help application developers 3044 * avoid looking for validate roots manually. Basically, it's equivalent to 3045 * first calling the {@link #invalidate()} method on this component, and 3046 * then calling the {@link #validate()} method on the nearest validate 3047 * root. 3048 * 3049 * @see Container#isValidateRoot 3050 * @since 1.7 3051 */ 3052 public void revalidate() { 3053 revalidateSynchronously(); 3054 } 3055 3056 /** 3057 * Revalidates the component synchronously. 3058 */ 3059 final void revalidateSynchronously() { 3060 synchronized (getTreeLock()) { 3061 invalidate(); 3062 3063 Container root = getContainer(); 3064 if (root == null) { 3065 // There's no parents. Just validate itself. 3066 validate(); 3067 } else { 3068 while (!root.isValidateRoot()) { 3069 if (root.getContainer() == null) { 3070 // If there's no validate roots, we'll validate the 3071 // topmost container 3072 break; 3073 } 3074 3075 root = root.getContainer(); 3076 } 3077 3078 root.validate(); 3079 } 3080 } 3081 } 3082 3083 /** 3084 * Creates a graphics context for this component. This method will 3085 * return <code>null</code> if this component is currently not 3086 * displayable. 3087 * @return a graphics context for this component, or <code>null</code> 3088 * if it has none 3089 * @see #paint 3090 * @since 1.0 3091 */ 3092 public Graphics getGraphics() { 3093 if (peer instanceof LightweightPeer) { 3094 // This is for a lightweight component, need to 3095 // translate coordinate spaces and clip relative 3096 // to the parent. 3097 if (parent == null) return null; 3098 Graphics g = parent.getGraphics(); 3099 if (g == null) return null; 3100 if (g instanceof ConstrainableGraphics) { 3101 ((ConstrainableGraphics) g).constrain(x, y, width, height); 3102 } else { 3103 g.translate(x,y); 3104 g.setClip(0, 0, width, height); 3105 } 3106 g.setFont(getFont()); 3107 return g; 3108 } else { 3109 ComponentPeer peer = this.peer; 3110 return (peer != null) ? peer.getGraphics() : null; 3111 } 3112 } 3113 3114 final Graphics getGraphics_NoClientCode() { 3115 ComponentPeer peer = this.peer; 3116 if (peer instanceof LightweightPeer) { 3117 // This is for a lightweight component, need to 3118 // translate coordinate spaces and clip relative 3119 // to the parent. 3120 Container parent = this.parent; 3121 if (parent == null) return null; 3122 Graphics g = parent.getGraphics_NoClientCode(); 3123 if (g == null) return null; 3124 if (g instanceof ConstrainableGraphics) { 3125 ((ConstrainableGraphics) g).constrain(x, y, width, height); 3126 } else { 3127 g.translate(x,y); 3128 g.setClip(0, 0, width, height); 3129 } 3130 g.setFont(getFont_NoClientCode()); 3131 return g; 3132 } else { 3133 return (peer != null) ? peer.getGraphics() : null; 3134 } 3135 } 3136 3137 /** 3138 * Gets the font metrics for the specified font. 3139 * Warning: Since Font metrics are affected by the 3140 * {@link java.awt.font.FontRenderContext FontRenderContext} and 3141 * this method does not provide one, it can return only metrics for 3142 * the default render context which may not match that used when 3143 * rendering on the Component if {@link Graphics2D} functionality is being 3144 * used. Instead metrics can be obtained at rendering time by calling 3145 * {@link Graphics#getFontMetrics()} or text measurement APIs on the 3146 * {@link Font Font} class. 3147 * @param font the font for which font metrics is to be 3148 * obtained 3149 * @return the font metrics for <code>font</code> 3150 * @see #getFont 3151 * @see java.awt.peer.ComponentPeer#getFontMetrics(Font) 3152 * @see Toolkit#getFontMetrics(Font) 3153 * @since 1.0 3154 */ 3155 public FontMetrics getFontMetrics(Font font) { 3156 // This is an unsupported hack, but left in for a customer. 3157 // Do not remove. 3158 FontManager fm = FontManagerFactory.getInstance(); 3159 if (fm instanceof SunFontManager 3160 && ((SunFontManager) fm).usePlatformFontMetrics()) { 3161 3162 if (peer != null && 3163 !(peer instanceof LightweightPeer)) { 3164 return peer.getFontMetrics(font); 3165 } 3166 } 3167 return sun.font.FontDesignMetrics.getMetrics(font); 3168 } 3169 3170 /** 3171 * Sets the cursor image to the specified cursor. This cursor 3172 * image is displayed when the <code>contains</code> method for 3173 * this component returns true for the current cursor location, and 3174 * this Component is visible, displayable, and enabled. Setting the 3175 * cursor of a <code>Container</code> causes that cursor to be displayed 3176 * within all of the container's subcomponents, except for those 3177 * that have a non-<code>null</code> cursor. 3178 * <p> 3179 * The method may have no visual effect if the Java platform 3180 * implementation and/or the native system do not support 3181 * changing the mouse cursor shape. 3182 * @param cursor One of the constants defined 3183 * by the <code>Cursor</code> class; 3184 * if this parameter is <code>null</code> 3185 * then this component will inherit 3186 * the cursor of its parent 3187 * @see #isEnabled 3188 * @see #isShowing 3189 * @see #getCursor 3190 * @see #contains 3191 * @see Toolkit#createCustomCursor 3192 * @see Cursor 3193 * @since 1.1 3194 */ 3195 public void setCursor(Cursor cursor) { 3196 this.cursor = cursor; 3197 updateCursorImmediately(); 3198 } 3199 3200 /** 3201 * Updates the cursor. May not be invoked from the native 3202 * message pump. 3203 */ 3204 final void updateCursorImmediately() { 3205 if (peer instanceof LightweightPeer) { 3206 Container nativeContainer = getNativeContainer(); 3207 3208 if (nativeContainer == null) return; 3209 3210 ComponentPeer cPeer = nativeContainer.peer; 3211 3212 if (cPeer != null) { 3213 cPeer.updateCursorImmediately(); 3214 } 3215 } else if (peer != null) { 3216 peer.updateCursorImmediately(); 3217 } 3218 } 3219 3220 /** 3221 * Gets the cursor set in the component. If the component does 3222 * not have a cursor set, the cursor of its parent is returned. 3223 * If no cursor is set in the entire hierarchy, 3224 * <code>Cursor.DEFAULT_CURSOR</code> is returned. 3225 * 3226 * @return the cursor for this component 3227 * @see #setCursor 3228 * @since 1.1 3229 */ 3230 public Cursor getCursor() { 3231 return getCursor_NoClientCode(); 3232 } 3233 3234 final Cursor getCursor_NoClientCode() { 3235 Cursor cursor = this.cursor; 3236 if (cursor != null) { 3237 return cursor; 3238 } 3239 Container parent = this.parent; 3240 if (parent != null) { 3241 return parent.getCursor_NoClientCode(); 3242 } else { 3243 return Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR); 3244 } 3245 } 3246 3247 /** 3248 * Returns whether the cursor has been explicitly set for this Component. 3249 * If this method returns <code>false</code>, this Component is inheriting 3250 * its cursor from an ancestor. 3251 * 3252 * @return <code>true</code> if the cursor has been explicitly set for this 3253 * Component; <code>false</code> otherwise. 3254 * @since 1.4 3255 */ 3256 public boolean isCursorSet() { 3257 return (cursor != null); 3258 } 3259 3260 /** 3261 * Paints this component. 3262 * <p> 3263 * This method is called when the contents of the component should 3264 * be painted; such as when the component is first being shown or 3265 * is damaged and in need of repair. The clip rectangle in the 3266 * <code>Graphics</code> parameter is set to the area 3267 * which needs to be painted. 3268 * Subclasses of <code>Component</code> that override this 3269 * method need not call <code>super.paint(g)</code>. 3270 * <p> 3271 * For performance reasons, <code>Component</code>s with zero width 3272 * or height aren't considered to need painting when they are first shown, 3273 * and also aren't considered to need repair. 3274 * <p> 3275 * <b>Note</b>: For more information on the paint mechanisms utilitized 3276 * by AWT and Swing, including information on how to write the most 3277 * efficient painting code, see 3278 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3279 * 3280 * @param g the graphics context to use for painting 3281 * @see #update 3282 * @since 1.0 3283 */ 3284 public void paint(Graphics g) { 3285 } 3286 3287 /** 3288 * Updates this component. 3289 * <p> 3290 * If this component is not a lightweight component, the 3291 * AWT calls the <code>update</code> method in response to 3292 * a call to <code>repaint</code>. You can assume that 3293 * the background is not cleared. 3294 * <p> 3295 * The <code>update</code> method of <code>Component</code> 3296 * calls this component's <code>paint</code> method to redraw 3297 * this component. This method is commonly overridden by subclasses 3298 * which need to do additional work in response to a call to 3299 * <code>repaint</code>. 3300 * Subclasses of Component that override this method should either 3301 * call <code>super.update(g)</code>, or call <code>paint(g)</code> 3302 * directly from their <code>update</code> method. 3303 * <p> 3304 * The origin of the graphics context, its 3305 * (<code>0</code>, <code>0</code>) coordinate point, is the 3306 * top-left corner of this component. The clipping region of the 3307 * graphics context is the bounding rectangle of this component. 3308 * 3309 * <p> 3310 * <b>Note</b>: For more information on the paint mechanisms utilitized 3311 * by AWT and Swing, including information on how to write the most 3312 * efficient painting code, see 3313 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3314 * 3315 * @param g the specified context to use for updating 3316 * @see #paint 3317 * @see #repaint() 3318 * @since 1.0 3319 */ 3320 public void update(Graphics g) { 3321 paint(g); 3322 } 3323 3324 /** 3325 * Paints this component and all of its subcomponents. 3326 * <p> 3327 * The origin of the graphics context, its 3328 * (<code>0</code>, <code>0</code>) coordinate point, is the 3329 * top-left corner of this component. The clipping region of the 3330 * graphics context is the bounding rectangle of this component. 3331 * 3332 * @param g the graphics context to use for painting 3333 * @see #paint 3334 * @since 1.0 3335 */ 3336 public void paintAll(Graphics g) { 3337 if (isShowing()) { 3338 GraphicsCallback.PeerPaintCallback.getInstance(). 3339 runOneComponent(this, new Rectangle(0, 0, width, height), 3340 g, g.getClip(), 3341 GraphicsCallback.LIGHTWEIGHTS | 3342 GraphicsCallback.HEAVYWEIGHTS); 3343 } 3344 } 3345 3346 /** 3347 * Simulates the peer callbacks into java.awt for painting of 3348 * lightweight Components. 3349 * @param g the graphics context to use for painting 3350 * @see #paintAll 3351 */ 3352 void lightweightPaint(Graphics g) { 3353 paint(g); 3354 } 3355 3356 /** 3357 * Paints all the heavyweight subcomponents. 3358 */ 3359 void paintHeavyweightComponents(Graphics g) { 3360 } 3361 3362 /** 3363 * Repaints this component. 3364 * <p> 3365 * If this component is a lightweight component, this method 3366 * causes a call to this component's <code>paint</code> 3367 * method as soon as possible. Otherwise, this method causes 3368 * a call to this component's <code>update</code> method as soon 3369 * as possible. 3370 * <p> 3371 * <b>Note</b>: For more information on the paint mechanisms utilitized 3372 * by AWT and Swing, including information on how to write the most 3373 * efficient painting code, see 3374 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3375 3376 * 3377 * @see #update(Graphics) 3378 * @since 1.0 3379 */ 3380 public void repaint() { 3381 repaint(0, 0, 0, width, height); 3382 } 3383 3384 /** 3385 * Repaints the component. If this component is a lightweight 3386 * component, this results in a call to <code>paint</code> 3387 * within <code>tm</code> milliseconds. 3388 * <p> 3389 * <b>Note</b>: For more information on the paint mechanisms utilitized 3390 * by AWT and Swing, including information on how to write the most 3391 * efficient painting code, see 3392 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3393 * 3394 * @param tm maximum time in milliseconds before update 3395 * @see #paint 3396 * @see #update(Graphics) 3397 * @since 1.0 3398 */ 3399 public void repaint(long tm) { 3400 repaint(tm, 0, 0, width, height); 3401 } 3402 3403 /** 3404 * Repaints the specified rectangle of this component. 3405 * <p> 3406 * If this component is a lightweight component, this method 3407 * causes a call to this component's <code>paint</code> method 3408 * as soon as possible. Otherwise, this method causes a call to 3409 * this component's <code>update</code> method as soon as possible. 3410 * <p> 3411 * <b>Note</b>: For more information on the paint mechanisms utilitized 3412 * by AWT and Swing, including information on how to write the most 3413 * efficient painting code, see 3414 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3415 * 3416 * @param x the <i>x</i> coordinate 3417 * @param y the <i>y</i> coordinate 3418 * @param width the width 3419 * @param height the height 3420 * @see #update(Graphics) 3421 * @since 1.0 3422 */ 3423 public void repaint(int x, int y, int width, int height) { 3424 repaint(0, x, y, width, height); 3425 } 3426 3427 /** 3428 * Repaints the specified rectangle of this component within 3429 * <code>tm</code> milliseconds. 3430 * <p> 3431 * If this component is a lightweight component, this method causes 3432 * a call to this component's <code>paint</code> method. 3433 * Otherwise, this method causes a call to this component's 3434 * <code>update</code> method. 3435 * <p> 3436 * <b>Note</b>: For more information on the paint mechanisms utilitized 3437 * by AWT and Swing, including information on how to write the most 3438 * efficient painting code, see 3439 * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>. 3440 * 3441 * @param tm maximum time in milliseconds before update 3442 * @param x the <i>x</i> coordinate 3443 * @param y the <i>y</i> coordinate 3444 * @param width the width 3445 * @param height the height 3446 * @see #update(Graphics) 3447 * @since 1.0 3448 */ 3449 public void repaint(long tm, int x, int y, int width, int height) { 3450 if (this.peer instanceof LightweightPeer) { 3451 // Needs to be translated to parent coordinates since 3452 // a parent native container provides the actual repaint 3453 // services. Additionally, the request is restricted to 3454 // the bounds of the component. 3455 if (parent != null) { 3456 if (x < 0) { 3457 width += x; 3458 x = 0; 3459 } 3460 if (y < 0) { 3461 height += y; 3462 y = 0; 3463 } 3464 3465 int pwidth = (width > this.width) ? this.width : width; 3466 int pheight = (height > this.height) ? this.height : height; 3467 3468 if (pwidth <= 0 || pheight <= 0) { 3469 return; 3470 } 3471 3472 int px = this.x + x; 3473 int py = this.y + y; 3474 parent.repaint(tm, px, py, pwidth, pheight); 3475 } 3476 } else { 3477 if (isVisible() && (this.peer != null) && 3478 (width > 0) && (height > 0)) { 3479 PaintEvent e = new PaintEvent(this, PaintEvent.UPDATE, 3480 new Rectangle(x, y, width, height)); 3481 SunToolkit.postEvent(SunToolkit.targetToAppContext(this), e); 3482 } 3483 } 3484 } 3485 3486 /** 3487 * Prints this component. Applications should override this method 3488 * for components that must do special processing before being 3489 * printed or should be printed differently than they are painted. 3490 * <p> 3491 * The default implementation of this method calls the 3492 * <code>paint</code> method. 3493 * <p> 3494 * The origin of the graphics context, its 3495 * (<code>0</code>, <code>0</code>) coordinate point, is the 3496 * top-left corner of this component. The clipping region of the 3497 * graphics context is the bounding rectangle of this component. 3498 * @param g the graphics context to use for printing 3499 * @see #paint(Graphics) 3500 * @since 1.0 3501 */ 3502 public void print(Graphics g) { 3503 paint(g); 3504 } 3505 3506 /** 3507 * Prints this component and all of its subcomponents. 3508 * <p> 3509 * The origin of the graphics context, its 3510 * (<code>0</code>, <code>0</code>) coordinate point, is the 3511 * top-left corner of this component. The clipping region of the 3512 * graphics context is the bounding rectangle of this component. 3513 * @param g the graphics context to use for printing 3514 * @see #print(Graphics) 3515 * @since 1.0 3516 */ 3517 public void printAll(Graphics g) { 3518 if (isShowing()) { 3519 GraphicsCallback.PeerPrintCallback.getInstance(). 3520 runOneComponent(this, new Rectangle(0, 0, width, height), 3521 g, g.getClip(), 3522 GraphicsCallback.LIGHTWEIGHTS | 3523 GraphicsCallback.HEAVYWEIGHTS); 3524 } 3525 } 3526 3527 /** 3528 * Simulates the peer callbacks into java.awt for printing of 3529 * lightweight Components. 3530 * @param g the graphics context to use for printing 3531 * @see #printAll 3532 */ 3533 void lightweightPrint(Graphics g) { 3534 print(g); 3535 } 3536 3537 /** 3538 * Prints all the heavyweight subcomponents. 3539 */ 3540 void printHeavyweightComponents(Graphics g) { 3541 } 3542 3543 private Insets getInsets_NoClientCode() { 3544 ComponentPeer peer = this.peer; 3545 if (peer instanceof ContainerPeer) { 3546 return (Insets)((ContainerPeer)peer).getInsets().clone(); 3547 } 3548 return new Insets(0, 0, 0, 0); 3549 } 3550 3551 /** 3552 * Repaints the component when the image has changed. 3553 * This <code>imageUpdate</code> method of an <code>ImageObserver</code> 3554 * is called when more information about an 3555 * image which had been previously requested using an asynchronous 3556 * routine such as the <code>drawImage</code> method of 3557 * <code>Graphics</code> becomes available. 3558 * See the definition of <code>imageUpdate</code> for 3559 * more information on this method and its arguments. 3560 * <p> 3561 * The <code>imageUpdate</code> method of <code>Component</code> 3562 * incrementally draws an image on the component as more of the bits 3563 * of the image are available. 3564 * <p> 3565 * If the system property <code>awt.image.incrementaldraw</code> 3566 * is missing or has the value <code>true</code>, the image is 3567 * incrementally drawn. If the system property has any other value, 3568 * then the image is not drawn until it has been completely loaded. 3569 * <p> 3570 * Also, if incremental drawing is in effect, the value of the 3571 * system property <code>awt.image.redrawrate</code> is interpreted 3572 * as an integer to give the maximum redraw rate, in milliseconds. If 3573 * the system property is missing or cannot be interpreted as an 3574 * integer, the redraw rate is once every 100ms. 3575 * <p> 3576 * The interpretation of the <code>x</code>, <code>y</code>, 3577 * <code>width</code>, and <code>height</code> arguments depends on 3578 * the value of the <code>infoflags</code> argument. 3579 * 3580 * @param img the image being observed 3581 * @param infoflags see <code>imageUpdate</code> for more information 3582 * @param x the <i>x</i> coordinate 3583 * @param y the <i>y</i> coordinate 3584 * @param w the width 3585 * @param h the height 3586 * @return <code>false</code> if the infoflags indicate that the 3587 * image is completely loaded; <code>true</code> otherwise. 3588 * 3589 * @see java.awt.image.ImageObserver 3590 * @see Graphics#drawImage(Image, int, int, Color, java.awt.image.ImageObserver) 3591 * @see Graphics#drawImage(Image, int, int, java.awt.image.ImageObserver) 3592 * @see Graphics#drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver) 3593 * @see Graphics#drawImage(Image, int, int, int, int, java.awt.image.ImageObserver) 3594 * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) 3595 * @since 1.0 3596 */ 3597 public boolean imageUpdate(Image img, int infoflags, 3598 int x, int y, int w, int h) { 3599 int rate = -1; 3600 if ((infoflags & (FRAMEBITS|ALLBITS)) != 0) { 3601 rate = 0; 3602 } else if ((infoflags & SOMEBITS) != 0) { 3603 if (isInc) { 3604 rate = incRate; 3605 if (rate < 0) { 3606 rate = 0; 3607 } 3608 } 3609 } 3610 if (rate >= 0) { 3611 repaint(rate, 0, 0, width, height); 3612 } 3613 return (infoflags & (ALLBITS|ABORT)) == 0; 3614 } 3615 3616 /** 3617 * Creates an image from the specified image producer. 3618 * @param producer the image producer 3619 * @return the image produced 3620 * @since 1.0 3621 */ 3622 public Image createImage(ImageProducer producer) { 3623 ComponentPeer peer = this.peer; 3624 if ((peer != null) && ! (peer instanceof LightweightPeer)) { 3625 return peer.createImage(producer); 3626 } 3627 return getToolkit().createImage(producer); 3628 } 3629 3630 /** 3631 * Creates an off-screen drawable image 3632 * to be used for double buffering. 3633 * @param width the specified width 3634 * @param height the specified height 3635 * @return an off-screen drawable image, which can be used for double 3636 * buffering. The return value may be <code>null</code> if the 3637 * component is not displayable. This will always happen if 3638 * <code>GraphicsEnvironment.isHeadless()</code> returns 3639 * <code>true</code>. 3640 * @see #isDisplayable 3641 * @see GraphicsEnvironment#isHeadless 3642 * @since 1.0 3643 */ 3644 public Image createImage(int width, int height) { 3645 ComponentPeer peer = this.peer; 3646 if (peer instanceof LightweightPeer) { 3647 if (parent != null) { return parent.createImage(width, height); } 3648 else { return null;} 3649 } else { 3650 return (peer != null) ? peer.createImage(width, height) : null; 3651 } 3652 } 3653 3654 /** 3655 * Creates a volatile off-screen drawable image 3656 * to be used for double buffering. 3657 * @param width the specified width. 3658 * @param height the specified height. 3659 * @return an off-screen drawable image, which can be used for double 3660 * buffering. The return value may be <code>null</code> if the 3661 * component is not displayable. This will always happen if 3662 * <code>GraphicsEnvironment.isHeadless()</code> returns 3663 * <code>true</code>. 3664 * @see java.awt.image.VolatileImage 3665 * @see #isDisplayable 3666 * @see GraphicsEnvironment#isHeadless 3667 * @since 1.4 3668 */ 3669 public VolatileImage createVolatileImage(int width, int height) { 3670 ComponentPeer peer = this.peer; 3671 if (peer instanceof LightweightPeer) { 3672 if (parent != null) { 3673 return parent.createVolatileImage(width, height); 3674 } 3675 else { return null;} 3676 } else { 3677 return (peer != null) ? 3678 peer.createVolatileImage(width, height) : null; 3679 } 3680 } 3681 3682 /** 3683 * Creates a volatile off-screen drawable image, with the given capabilities. 3684 * The contents of this image may be lost at any time due 3685 * to operating system issues, so the image must be managed 3686 * via the <code>VolatileImage</code> interface. 3687 * @param width the specified width. 3688 * @param height the specified height. 3689 * @param caps the image capabilities 3690 * @exception AWTException if an image with the specified capabilities cannot 3691 * be created 3692 * @return a VolatileImage object, which can be used 3693 * to manage surface contents loss and capabilities. 3694 * @see java.awt.image.VolatileImage 3695 * @since 1.4 3696 */ 3697 public VolatileImage createVolatileImage(int width, int height, 3698 ImageCapabilities caps) throws AWTException { 3699 // REMIND : check caps 3700 return createVolatileImage(width, height); 3701 } 3702 3703 /** 3704 * Prepares an image for rendering on this component. The image 3705 * data is downloaded asynchronously in another thread and the 3706 * appropriate screen representation of the image is generated. 3707 * @param image the <code>Image</code> for which to 3708 * prepare a screen representation 3709 * @param observer the <code>ImageObserver</code> object 3710 * to be notified as the image is being prepared 3711 * @return <code>true</code> if the image has already been fully 3712 * prepared; <code>false</code> otherwise 3713 * @since 1.0 3714 */ 3715 public boolean prepareImage(Image image, ImageObserver observer) { 3716 return prepareImage(image, -1, -1, observer); 3717 } 3718 3719 /** 3720 * Prepares an image for rendering on this component at the 3721 * specified width and height. 3722 * <p> 3723 * The image data is downloaded asynchronously in another thread, 3724 * and an appropriately scaled screen representation of the image is 3725 * generated. 3726 * @param image the instance of <code>Image</code> 3727 * for which to prepare a screen representation 3728 * @param width the width of the desired screen representation 3729 * @param height the height of the desired screen representation 3730 * @param observer the <code>ImageObserver</code> object 3731 * to be notified as the image is being prepared 3732 * @return <code>true</code> if the image has already been fully 3733 * prepared; <code>false</code> otherwise 3734 * @see java.awt.image.ImageObserver 3735 * @since 1.0 3736 */ 3737 public boolean prepareImage(Image image, int width, int height, 3738 ImageObserver observer) { 3739 ComponentPeer peer = this.peer; 3740 if (peer instanceof LightweightPeer) { 3741 return (parent != null) 3742 ? parent.prepareImage(image, width, height, observer) 3743 : getToolkit().prepareImage(image, width, height, observer); 3744 } else { 3745 return (peer != null) 3746 ? peer.prepareImage(image, width, height, observer) 3747 : getToolkit().prepareImage(image, width, height, observer); 3748 } 3749 } 3750 3751 /** 3752 * Returns the status of the construction of a screen representation 3753 * of the specified image. 3754 * <p> 3755 * This method does not cause the image to begin loading. An 3756 * application must use the <code>prepareImage</code> method 3757 * to force the loading of an image. 3758 * <p> 3759 * Information on the flags returned by this method can be found 3760 * with the discussion of the <code>ImageObserver</code> interface. 3761 * @param image the <code>Image</code> object whose status 3762 * is being checked 3763 * @param observer the <code>ImageObserver</code> 3764 * object to be notified as the image is being prepared 3765 * @return the bitwise inclusive <b>OR</b> of 3766 * <code>ImageObserver</code> flags indicating what 3767 * information about the image is currently available 3768 * @see #prepareImage(Image, int, int, java.awt.image.ImageObserver) 3769 * @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver) 3770 * @see java.awt.image.ImageObserver 3771 * @since 1.0 3772 */ 3773 public int checkImage(Image image, ImageObserver observer) { 3774 return checkImage(image, -1, -1, observer); 3775 } 3776 3777 /** 3778 * Returns the status of the construction of a screen representation 3779 * of the specified image. 3780 * <p> 3781 * This method does not cause the image to begin loading. An 3782 * application must use the <code>prepareImage</code> method 3783 * to force the loading of an image. 3784 * <p> 3785 * The <code>checkImage</code> method of <code>Component</code> 3786 * calls its peer's <code>checkImage</code> method to calculate 3787 * the flags. If this component does not yet have a peer, the 3788 * component's toolkit's <code>checkImage</code> method is called 3789 * instead. 3790 * <p> 3791 * Information on the flags returned by this method can be found 3792 * with the discussion of the <code>ImageObserver</code> interface. 3793 * @param image the <code>Image</code> object whose status 3794 * is being checked 3795 * @param width the width of the scaled version 3796 * whose status is to be checked 3797 * @param height the height of the scaled version 3798 * whose status is to be checked 3799 * @param observer the <code>ImageObserver</code> object 3800 * to be notified as the image is being prepared 3801 * @return the bitwise inclusive <b>OR</b> of 3802 * <code>ImageObserver</code> flags indicating what 3803 * information about the image is currently available 3804 * @see #prepareImage(Image, int, int, java.awt.image.ImageObserver) 3805 * @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver) 3806 * @see java.awt.image.ImageObserver 3807 * @since 1.0 3808 */ 3809 public int checkImage(Image image, int width, int height, 3810 ImageObserver observer) { 3811 ComponentPeer peer = this.peer; 3812 if (peer instanceof LightweightPeer) { 3813 return (parent != null) 3814 ? parent.checkImage(image, width, height, observer) 3815 : getToolkit().checkImage(image, width, height, observer); 3816 } else { 3817 return (peer != null) 3818 ? peer.checkImage(image, width, height, observer) 3819 : getToolkit().checkImage(image, width, height, observer); 3820 } 3821 } 3822 3823 /** 3824 * Creates a new strategy for multi-buffering on this component. 3825 * Multi-buffering is useful for rendering performance. This method 3826 * attempts to create the best strategy available with the number of 3827 * buffers supplied. It will always create a <code>BufferStrategy</code> 3828 * with that number of buffers. 3829 * A page-flipping strategy is attempted first, then a blitting strategy 3830 * using accelerated buffers. Finally, an unaccelerated blitting 3831 * strategy is used. 3832 * <p> 3833 * Each time this method is called, 3834 * the existing buffer strategy for this component is discarded. 3835 * @param numBuffers number of buffers to create, including the front buffer 3836 * @exception IllegalArgumentException if numBuffers is less than 1. 3837 * @exception IllegalStateException if the component is not displayable 3838 * @see #isDisplayable 3839 * @see Window#getBufferStrategy() 3840 * @see Canvas#getBufferStrategy() 3841 * @since 1.4 3842 */ 3843 void createBufferStrategy(int numBuffers) { 3844 BufferCapabilities bufferCaps; 3845 if (numBuffers > 1) { 3846 // Try to create a page-flipping strategy 3847 bufferCaps = new BufferCapabilities(new ImageCapabilities(true), 3848 new ImageCapabilities(true), 3849 BufferCapabilities.FlipContents.UNDEFINED); 3850 try { 3851 createBufferStrategy(numBuffers, bufferCaps); 3852 return; // Success 3853 } catch (AWTException e) { 3854 // Failed 3855 } 3856 } 3857 // Try a blitting (but still accelerated) strategy 3858 bufferCaps = new BufferCapabilities(new ImageCapabilities(true), 3859 new ImageCapabilities(true), 3860 null); 3861 try { 3862 createBufferStrategy(numBuffers, bufferCaps); 3863 return; // Success 3864 } catch (AWTException e) { 3865 // Failed 3866 } 3867 // Try an unaccelerated blitting strategy 3868 bufferCaps = new BufferCapabilities(new ImageCapabilities(false), 3869 new ImageCapabilities(false), 3870 null); 3871 try { 3872 createBufferStrategy(numBuffers, bufferCaps); 3873 return; // Success 3874 } catch (AWTException e) { 3875 // Code should never reach here (an unaccelerated blitting 3876 // strategy should always work) 3877 throw new InternalError("Could not create a buffer strategy", e); 3878 } 3879 } 3880 3881 /** 3882 * Creates a new strategy for multi-buffering on this component with the 3883 * required buffer capabilities. This is useful, for example, if only 3884 * accelerated memory or page flipping is desired (as specified by the 3885 * buffer capabilities). 3886 * <p> 3887 * Each time this method 3888 * is called, <code>dispose</code> will be invoked on the existing 3889 * <code>BufferStrategy</code>. 3890 * @param numBuffers number of buffers to create 3891 * @param caps the required capabilities for creating the buffer strategy; 3892 * cannot be <code>null</code> 3893 * @exception AWTException if the capabilities supplied could not be 3894 * supported or met; this may happen, for example, if there is not enough 3895 * accelerated memory currently available, or if page flipping is specified 3896 * but not possible. 3897 * @exception IllegalArgumentException if numBuffers is less than 1, or if 3898 * caps is <code>null</code> 3899 * @see Window#getBufferStrategy() 3900 * @see Canvas#getBufferStrategy() 3901 * @since 1.4 3902 */ 3903 void createBufferStrategy(int numBuffers, 3904 BufferCapabilities caps) throws AWTException { 3905 // Check arguments 3906 if (numBuffers < 1) { 3907 throw new IllegalArgumentException( 3908 "Number of buffers must be at least 1"); 3909 } 3910 if (caps == null) { 3911 throw new IllegalArgumentException("No capabilities specified"); 3912 } 3913 // Destroy old buffers 3914 if (bufferStrategy != null) { 3915 bufferStrategy.dispose(); 3916 } 3917 if (numBuffers == 1) { 3918 bufferStrategy = new SingleBufferStrategy(caps); 3919 } else { 3920 SunGraphicsEnvironment sge = (SunGraphicsEnvironment) 3921 GraphicsEnvironment.getLocalGraphicsEnvironment(); 3922 if (!caps.isPageFlipping() && sge.isFlipStrategyPreferred(peer)) { 3923 caps = new ProxyCapabilities(caps); 3924 } 3925 // assert numBuffers > 1; 3926 if (caps.isPageFlipping()) { 3927 bufferStrategy = new FlipSubRegionBufferStrategy(numBuffers, caps); 3928 } else { 3929 bufferStrategy = new BltSubRegionBufferStrategy(numBuffers, caps); 3930 } 3931 } 3932 } 3933 3934 /** 3935 * This is a proxy capabilities class used when a FlipBufferStrategy 3936 * is created instead of the requested Blit strategy. 3937 * 3938 * @see sun.java2d.SunGraphicsEnvironment#isFlipStrategyPreferred(ComponentPeer) 3939 */ 3940 private class ProxyCapabilities extends ExtendedBufferCapabilities { 3941 private BufferCapabilities orig; 3942 private ProxyCapabilities(BufferCapabilities orig) { 3943 super(orig.getFrontBufferCapabilities(), 3944 orig.getBackBufferCapabilities(), 3945 orig.getFlipContents() == 3946 BufferCapabilities.FlipContents.BACKGROUND ? 3947 BufferCapabilities.FlipContents.BACKGROUND : 3948 BufferCapabilities.FlipContents.COPIED); 3949 this.orig = orig; 3950 } 3951 } 3952 3953 /** 3954 * @return the buffer strategy used by this component 3955 * @see Window#createBufferStrategy 3956 * @see Canvas#createBufferStrategy 3957 * @since 1.4 3958 */ 3959 BufferStrategy getBufferStrategy() { 3960 return bufferStrategy; 3961 } 3962 3963 /** 3964 * @return the back buffer currently used by this component's 3965 * BufferStrategy. If there is no BufferStrategy or no 3966 * back buffer, this method returns null. 3967 */ 3968 Image getBackBuffer() { 3969 if (bufferStrategy != null) { 3970 if (bufferStrategy instanceof BltBufferStrategy) { 3971 BltBufferStrategy bltBS = (BltBufferStrategy)bufferStrategy; 3972 return bltBS.getBackBuffer(); 3973 } else if (bufferStrategy instanceof FlipBufferStrategy) { 3974 FlipBufferStrategy flipBS = (FlipBufferStrategy)bufferStrategy; 3975 return flipBS.getBackBuffer(); 3976 } 3977 } 3978 return null; 3979 } 3980 3981 /** 3982 * Inner class for flipping buffers on a component. That component must 3983 * be a <code>Canvas</code> or <code>Window</code>. 3984 * @see Canvas 3985 * @see Window 3986 * @see java.awt.image.BufferStrategy 3987 * @author Michael Martak 3988 * @since 1.4 3989 */ 3990 protected class FlipBufferStrategy extends BufferStrategy { 3991 /** 3992 * The number of buffers 3993 */ 3994 protected int numBuffers; // = 0 3995 /** 3996 * The buffering capabilities 3997 */ 3998 protected BufferCapabilities caps; // = null 3999 /** 4000 * The drawing buffer 4001 */ 4002 protected Image drawBuffer; // = null 4003 /** 4004 * The drawing buffer as a volatile image 4005 */ 4006 protected VolatileImage drawVBuffer; // = null 4007 /** 4008 * Whether or not the drawing buffer has been recently restored from 4009 * a lost state. 4010 */ 4011 protected boolean validatedContents; // = false 4012 4013 /** 4014 * Size of the back buffers. (Note: these fields were added in 6.0 4015 * but kept package-private to avoid exposing them in the spec. 4016 * None of these fields/methods really should have been marked 4017 * protected when they were introduced in 1.4, but now we just have 4018 * to live with that decision.) 4019 */ 4020 4021 /** 4022 * The width of the back buffers 4023 */ 4024 int width; 4025 4026 /** 4027 * The height of the back buffers 4028 */ 4029 int height; 4030 4031 /** 4032 * Creates a new flipping buffer strategy for this component. 4033 * The component must be a <code>Canvas</code> or <code>Window</code> or 4034 * <code>Applet</code>. 4035 * @see Canvas 4036 * @see Window 4037 * @see Applet 4038 * @param numBuffers the number of buffers 4039 * @param caps the capabilities of the buffers 4040 * @exception AWTException if the capabilities supplied could not be 4041 * supported or met 4042 * @exception ClassCastException if the component is not a canvas or 4043 * window. 4044 * @exception IllegalStateException if the component has no peer 4045 * @exception IllegalArgumentException if {@code numBuffers} is less than two, 4046 * or if {@code BufferCapabilities.isPageFlipping} is not 4047 * {@code true}. 4048 * @see #createBuffers(int, BufferCapabilities) 4049 */ 4050 protected FlipBufferStrategy(int numBuffers, BufferCapabilities caps) 4051 throws AWTException 4052 { 4053 if (!(Component.this instanceof Window) && 4054 !(Component.this instanceof Canvas) && 4055 !(Component.this instanceof Applet)) 4056 { 4057 throw new ClassCastException( 4058 "Component must be a Canvas or Window or Applet"); 4059 } 4060 this.numBuffers = numBuffers; 4061 this.caps = caps; 4062 createBuffers(numBuffers, caps); 4063 } 4064 4065 /** 4066 * Creates one or more complex, flipping buffers with the given 4067 * capabilities. 4068 * @param numBuffers number of buffers to create; must be greater than 4069 * one 4070 * @param caps the capabilities of the buffers. 4071 * <code>BufferCapabilities.isPageFlipping</code> must be 4072 * <code>true</code>. 4073 * @exception AWTException if the capabilities supplied could not be 4074 * supported or met 4075 * @exception IllegalStateException if the component has no peer 4076 * @exception IllegalArgumentException if numBuffers is less than two, 4077 * or if <code>BufferCapabilities.isPageFlipping</code> is not 4078 * <code>true</code>. 4079 * @see java.awt.BufferCapabilities#isPageFlipping() 4080 */ 4081 protected void createBuffers(int numBuffers, BufferCapabilities caps) 4082 throws AWTException 4083 { 4084 if (numBuffers < 2) { 4085 throw new IllegalArgumentException( 4086 "Number of buffers cannot be less than two"); 4087 } else if (peer == null) { 4088 throw new IllegalStateException( 4089 "Component must have a valid peer"); 4090 } else if (caps == null || !caps.isPageFlipping()) { 4091 throw new IllegalArgumentException( 4092 "Page flipping capabilities must be specified"); 4093 } 4094 4095 // save the current bounds 4096 width = getWidth(); 4097 height = getHeight(); 4098 4099 if (drawBuffer != null) { 4100 // dispose the existing backbuffers 4101 drawBuffer = null; 4102 drawVBuffer = null; 4103 destroyBuffers(); 4104 // ... then recreate the backbuffers 4105 } 4106 4107 if (caps instanceof ExtendedBufferCapabilities) { 4108 ExtendedBufferCapabilities ebc = 4109 (ExtendedBufferCapabilities)caps; 4110 if (ebc.getVSync() == VSYNC_ON) { 4111 // if this buffer strategy is not allowed to be v-synced, 4112 // change the caps that we pass to the peer but keep on 4113 // trying to create v-synced buffers; 4114 // do not throw IAE here in case it is disallowed, see 4115 // ExtendedBufferCapabilities for more info 4116 if (!VSyncedBSManager.vsyncAllowed(this)) { 4117 caps = ebc.derive(VSYNC_DEFAULT); 4118 } 4119 } 4120 } 4121 4122 peer.createBuffers(numBuffers, caps); 4123 updateInternalBuffers(); 4124 } 4125 4126 /** 4127 * Updates internal buffers (both volatile and non-volatile) 4128 * by requesting the back-buffer from the peer. 4129 */ 4130 private void updateInternalBuffers() { 4131 // get the images associated with the draw buffer 4132 drawBuffer = getBackBuffer(); 4133 if (drawBuffer instanceof VolatileImage) { 4134 drawVBuffer = (VolatileImage)drawBuffer; 4135 } else { 4136 drawVBuffer = null; 4137 } 4138 } 4139 4140 /** 4141 * @return direct access to the back buffer, as an image. 4142 * @exception IllegalStateException if the buffers have not yet 4143 * been created 4144 */ 4145 protected Image getBackBuffer() { 4146 if (peer != null) { 4147 return peer.getBackBuffer(); 4148 } else { 4149 throw new IllegalStateException( 4150 "Component must have a valid peer"); 4151 } 4152 } 4153 4154 /** 4155 * Flipping moves the contents of the back buffer to the front buffer, 4156 * either by copying or by moving the video pointer. 4157 * @param flipAction an integer value describing the flipping action 4158 * for the contents of the back buffer. This should be one of the 4159 * values of the <code>BufferCapabilities.FlipContents</code> 4160 * property. 4161 * @exception IllegalStateException if the buffers have not yet 4162 * been created 4163 * @see java.awt.BufferCapabilities#getFlipContents() 4164 */ 4165 protected void flip(BufferCapabilities.FlipContents flipAction) { 4166 if (peer != null) { 4167 Image backBuffer = getBackBuffer(); 4168 if (backBuffer != null) { 4169 peer.flip(0, 0, 4170 backBuffer.getWidth(null), 4171 backBuffer.getHeight(null), flipAction); 4172 } 4173 } else { 4174 throw new IllegalStateException( 4175 "Component must have a valid peer"); 4176 } 4177 } 4178 4179 void flipSubRegion(int x1, int y1, int x2, int y2, 4180 BufferCapabilities.FlipContents flipAction) 4181 { 4182 if (peer != null) { 4183 peer.flip(x1, y1, x2, y2, flipAction); 4184 } else { 4185 throw new IllegalStateException( 4186 "Component must have a valid peer"); 4187 } 4188 } 4189 4190 /** 4191 * Destroys the buffers created through this object 4192 */ 4193 protected void destroyBuffers() { 4194 VSyncedBSManager.releaseVsync(this); 4195 if (peer != null) { 4196 peer.destroyBuffers(); 4197 } else { 4198 throw new IllegalStateException( 4199 "Component must have a valid peer"); 4200 } 4201 } 4202 4203 /** 4204 * @return the buffering capabilities of this strategy 4205 */ 4206 public BufferCapabilities getCapabilities() { 4207 if (caps instanceof ProxyCapabilities) { 4208 return ((ProxyCapabilities)caps).orig; 4209 } else { 4210 return caps; 4211 } 4212 } 4213 4214 /** 4215 * @return the graphics on the drawing buffer. This method may not 4216 * be synchronized for performance reasons; use of this method by multiple 4217 * threads should be handled at the application level. Disposal of the 4218 * graphics object must be handled by the application. 4219 */ 4220 public Graphics getDrawGraphics() { 4221 revalidate(); 4222 return drawBuffer.getGraphics(); 4223 } 4224 4225 /** 4226 * Restore the drawing buffer if it has been lost 4227 */ 4228 protected void revalidate() { 4229 revalidate(true); 4230 } 4231 4232 void revalidate(boolean checkSize) { 4233 validatedContents = false; 4234 4235 if (checkSize && (getWidth() != width || getHeight() != height)) { 4236 // component has been resized; recreate the backbuffers 4237 try { 4238 createBuffers(numBuffers, caps); 4239 } catch (AWTException e) { 4240 // shouldn't be possible 4241 } 4242 validatedContents = true; 4243 } 4244 4245 // get the buffers from the peer every time since they 4246 // might have been replaced in response to a display change event 4247 updateInternalBuffers(); 4248 4249 // now validate the backbuffer 4250 if (drawVBuffer != null) { 4251 GraphicsConfiguration gc = 4252 getGraphicsConfiguration_NoClientCode(); 4253 int returnCode = drawVBuffer.validate(gc); 4254 if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) { 4255 try { 4256 createBuffers(numBuffers, caps); 4257 } catch (AWTException e) { 4258 // shouldn't be possible 4259 } 4260 if (drawVBuffer != null) { 4261 // backbuffers were recreated, so validate again 4262 drawVBuffer.validate(gc); 4263 } 4264 validatedContents = true; 4265 } else if (returnCode == VolatileImage.IMAGE_RESTORED) { 4266 validatedContents = true; 4267 } 4268 } 4269 } 4270 4271 /** 4272 * @return whether the drawing buffer was lost since the last call to 4273 * <code>getDrawGraphics</code> 4274 */ 4275 public boolean contentsLost() { 4276 if (drawVBuffer == null) { 4277 return false; 4278 } 4279 return drawVBuffer.contentsLost(); 4280 } 4281 4282 /** 4283 * @return whether the drawing buffer was recently restored from a lost 4284 * state and reinitialized to the default background color (white) 4285 */ 4286 public boolean contentsRestored() { 4287 return validatedContents; 4288 } 4289 4290 /** 4291 * Makes the next available buffer visible by either blitting or 4292 * flipping. 4293 */ 4294 public void show() { 4295 flip(caps.getFlipContents()); 4296 } 4297 4298 /** 4299 * Makes specified region of the next available buffer visible 4300 * by either blitting or flipping. 4301 */ 4302 void showSubRegion(int x1, int y1, int x2, int y2) { 4303 flipSubRegion(x1, y1, x2, y2, caps.getFlipContents()); 4304 } 4305 4306 /** 4307 * {@inheritDoc} 4308 * @since 1.6 4309 */ 4310 public void dispose() { 4311 if (Component.this.bufferStrategy == this) { 4312 Component.this.bufferStrategy = null; 4313 if (peer != null) { 4314 destroyBuffers(); 4315 } 4316 } 4317 } 4318 4319 } // Inner class FlipBufferStrategy 4320 4321 /** 4322 * Inner class for blitting offscreen surfaces to a component. 4323 * 4324 * @author Michael Martak 4325 * @since 1.4 4326 */ 4327 protected class BltBufferStrategy extends BufferStrategy { 4328 4329 /** 4330 * The buffering capabilities 4331 */ 4332 protected BufferCapabilities caps; // = null 4333 /** 4334 * The back buffers 4335 */ 4336 protected VolatileImage[] backBuffers; // = null 4337 /** 4338 * Whether or not the drawing buffer has been recently restored from 4339 * a lost state. 4340 */ 4341 protected boolean validatedContents; // = false 4342 /** 4343 * Width of the back buffers 4344 */ 4345 protected int width; 4346 /** 4347 * Height of the back buffers 4348 */ 4349 protected int height; 4350 4351 /** 4352 * Insets for the hosting Component. The size of the back buffer 4353 * is constrained by these. 4354 */ 4355 private Insets insets; 4356 4357 /** 4358 * Creates a new blt buffer strategy around a component 4359 * @param numBuffers number of buffers to create, including the 4360 * front buffer 4361 * @param caps the capabilities of the buffers 4362 */ 4363 protected BltBufferStrategy(int numBuffers, BufferCapabilities caps) { 4364 this.caps = caps; 4365 createBackBuffers(numBuffers - 1); 4366 } 4367 4368 /** 4369 * {@inheritDoc} 4370 * @since 1.6 4371 */ 4372 public void dispose() { 4373 if (backBuffers != null) { 4374 for (int counter = backBuffers.length - 1; counter >= 0; 4375 counter--) { 4376 if (backBuffers[counter] != null) { 4377 backBuffers[counter].flush(); 4378 backBuffers[counter] = null; 4379 } 4380 } 4381 } 4382 if (Component.this.bufferStrategy == this) { 4383 Component.this.bufferStrategy = null; 4384 } 4385 } 4386 4387 /** 4388 * Creates the back buffers 4389 * 4390 * @param numBuffers the number of buffers to create 4391 */ 4392 protected void createBackBuffers(int numBuffers) { 4393 if (numBuffers == 0) { 4394 backBuffers = null; 4395 } else { 4396 // save the current bounds 4397 width = getWidth(); 4398 height = getHeight(); 4399 insets = getInsets_NoClientCode(); 4400 int iWidth = width - insets.left - insets.right; 4401 int iHeight = height - insets.top - insets.bottom; 4402 4403 // It is possible for the component's width and/or height 4404 // to be 0 here. Force the size of the backbuffers to 4405 // be > 0 so that creating the image won't fail. 4406 iWidth = Math.max(1, iWidth); 4407 iHeight = Math.max(1, iHeight); 4408 if (backBuffers == null) { 4409 backBuffers = new VolatileImage[numBuffers]; 4410 } else { 4411 // flush any existing backbuffers 4412 for (int i = 0; i < numBuffers; i++) { 4413 if (backBuffers[i] != null) { 4414 backBuffers[i].flush(); 4415 backBuffers[i] = null; 4416 } 4417 } 4418 } 4419 4420 // create the backbuffers 4421 for (int i = 0; i < numBuffers; i++) { 4422 backBuffers[i] = createVolatileImage(iWidth, iHeight); 4423 } 4424 } 4425 } 4426 4427 /** 4428 * @return the buffering capabilities of this strategy 4429 */ 4430 public BufferCapabilities getCapabilities() { 4431 return caps; 4432 } 4433 4434 /** 4435 * @return the draw graphics 4436 */ 4437 public Graphics getDrawGraphics() { 4438 revalidate(); 4439 Image backBuffer = getBackBuffer(); 4440 if (backBuffer == null) { 4441 return getGraphics(); 4442 } 4443 SunGraphics2D g = (SunGraphics2D)backBuffer.getGraphics(); 4444 g.constrain(-insets.left, -insets.top, 4445 backBuffer.getWidth(null) + insets.left, 4446 backBuffer.getHeight(null) + insets.top); 4447 return g; 4448 } 4449 4450 /** 4451 * @return direct access to the back buffer, as an image. 4452 * If there is no back buffer, returns null. 4453 */ 4454 Image getBackBuffer() { 4455 if (backBuffers != null) { 4456 return backBuffers[backBuffers.length - 1]; 4457 } else { 4458 return null; 4459 } 4460 } 4461 4462 /** 4463 * Makes the next available buffer visible. 4464 */ 4465 public void show() { 4466 showSubRegion(insets.left, insets.top, 4467 width - insets.right, 4468 height - insets.bottom); 4469 } 4470 4471 /** 4472 * Package-private method to present a specific rectangular area 4473 * of this buffer. This class currently shows only the entire 4474 * buffer, by calling showSubRegion() with the full dimensions of 4475 * the buffer. Subclasses (e.g., BltSubRegionBufferStrategy 4476 * and FlipSubRegionBufferStrategy) may have region-specific show 4477 * methods that call this method with actual sub regions of the 4478 * buffer. 4479 */ 4480 void showSubRegion(int x1, int y1, int x2, int y2) { 4481 if (backBuffers == null) { 4482 return; 4483 } 4484 // Adjust location to be relative to client area. 4485 x1 -= insets.left; 4486 x2 -= insets.left; 4487 y1 -= insets.top; 4488 y2 -= insets.top; 4489 Graphics g = getGraphics_NoClientCode(); 4490 if (g == null) { 4491 // Not showing, bail 4492 return; 4493 } 4494 try { 4495 // First image copy is in terms of Frame's coordinates, need 4496 // to translate to client area. 4497 g.translate(insets.left, insets.top); 4498 for (int i = 0; i < backBuffers.length; i++) { 4499 g.drawImage(backBuffers[i], 4500 x1, y1, x2, y2, 4501 x1, y1, x2, y2, 4502 null); 4503 g.dispose(); 4504 g = null; 4505 g = backBuffers[i].getGraphics(); 4506 } 4507 } finally { 4508 if (g != null) { 4509 g.dispose(); 4510 } 4511 } 4512 } 4513 4514 /** 4515 * Restore the drawing buffer if it has been lost 4516 */ 4517 protected void revalidate() { 4518 revalidate(true); 4519 } 4520 4521 void revalidate(boolean checkSize) { 4522 validatedContents = false; 4523 4524 if (backBuffers == null) { 4525 return; 4526 } 4527 4528 if (checkSize) { 4529 Insets insets = getInsets_NoClientCode(); 4530 if (getWidth() != width || getHeight() != height || 4531 !insets.equals(this.insets)) { 4532 // component has been resized; recreate the backbuffers 4533 createBackBuffers(backBuffers.length); 4534 validatedContents = true; 4535 } 4536 } 4537 4538 // now validate the backbuffer 4539 GraphicsConfiguration gc = getGraphicsConfiguration_NoClientCode(); 4540 int returnCode = 4541 backBuffers[backBuffers.length - 1].validate(gc); 4542 if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) { 4543 if (checkSize) { 4544 createBackBuffers(backBuffers.length); 4545 // backbuffers were recreated, so validate again 4546 backBuffers[backBuffers.length - 1].validate(gc); 4547 } 4548 // else case means we're called from Swing on the toolkit 4549 // thread, don't recreate buffers as that'll deadlock 4550 // (creating VolatileImages invokes getting GraphicsConfig 4551 // which grabs treelock). 4552 validatedContents = true; 4553 } else if (returnCode == VolatileImage.IMAGE_RESTORED) { 4554 validatedContents = true; 4555 } 4556 } 4557 4558 /** 4559 * @return whether the drawing buffer was lost since the last call to 4560 * <code>getDrawGraphics</code> 4561 */ 4562 public boolean contentsLost() { 4563 if (backBuffers == null) { 4564 return false; 4565 } else { 4566 return backBuffers[backBuffers.length - 1].contentsLost(); 4567 } 4568 } 4569 4570 /** 4571 * @return whether the drawing buffer was recently restored from a lost 4572 * state and reinitialized to the default background color (white) 4573 */ 4574 public boolean contentsRestored() { 4575 return validatedContents; 4576 } 4577 } // Inner class BltBufferStrategy 4578 4579 /** 4580 * Private class to perform sub-region flipping. 4581 */ 4582 private class FlipSubRegionBufferStrategy extends FlipBufferStrategy 4583 implements SubRegionShowable 4584 { 4585 4586 protected FlipSubRegionBufferStrategy(int numBuffers, 4587 BufferCapabilities caps) 4588 throws AWTException 4589 { 4590 super(numBuffers, caps); 4591 } 4592 4593 public void show(int x1, int y1, int x2, int y2) { 4594 showSubRegion(x1, y1, x2, y2); 4595 } 4596 4597 // This is invoked by Swing on the toolkit thread. 4598 public boolean showIfNotLost(int x1, int y1, int x2, int y2) { 4599 if (!contentsLost()) { 4600 showSubRegion(x1, y1, x2, y2); 4601 return !contentsLost(); 4602 } 4603 return false; 4604 } 4605 } 4606 4607 /** 4608 * Private class to perform sub-region blitting. Swing will use 4609 * this subclass via the SubRegionShowable interface in order to 4610 * copy only the area changed during a repaint. 4611 * See javax.swing.BufferStrategyPaintManager. 4612 */ 4613 private class BltSubRegionBufferStrategy extends BltBufferStrategy 4614 implements SubRegionShowable 4615 { 4616 4617 protected BltSubRegionBufferStrategy(int numBuffers, 4618 BufferCapabilities caps) 4619 { 4620 super(numBuffers, caps); 4621 } 4622 4623 public void show(int x1, int y1, int x2, int y2) { 4624 showSubRegion(x1, y1, x2, y2); 4625 } 4626 4627 // This method is called by Swing on the toolkit thread. 4628 public boolean showIfNotLost(int x1, int y1, int x2, int y2) { 4629 if (!contentsLost()) { 4630 showSubRegion(x1, y1, x2, y2); 4631 return !contentsLost(); 4632 } 4633 return false; 4634 } 4635 } 4636 4637 /** 4638 * Inner class for flipping buffers on a component. That component must 4639 * be a <code>Canvas</code> or <code>Window</code>. 4640 * @see Canvas 4641 * @see Window 4642 * @see java.awt.image.BufferStrategy 4643 * @author Michael Martak 4644 * @since 1.4 4645 */ 4646 private class SingleBufferStrategy extends BufferStrategy { 4647 4648 private BufferCapabilities caps; 4649 4650 public SingleBufferStrategy(BufferCapabilities caps) { 4651 this.caps = caps; 4652 } 4653 public BufferCapabilities getCapabilities() { 4654 return caps; 4655 } 4656 public Graphics getDrawGraphics() { 4657 return getGraphics(); 4658 } 4659 public boolean contentsLost() { 4660 return false; 4661 } 4662 public boolean contentsRestored() { 4663 return false; 4664 } 4665 public void show() { 4666 // Do nothing 4667 } 4668 } // Inner class SingleBufferStrategy 4669 4670 /** 4671 * Sets whether or not paint messages received from the operating system 4672 * should be ignored. This does not affect paint events generated in 4673 * software by the AWT, unless they are an immediate response to an 4674 * OS-level paint message. 4675 * <p> 4676 * This is useful, for example, if running under full-screen mode and 4677 * better performance is desired, or if page-flipping is used as the 4678 * buffer strategy. 4679 * 4680 * @param ignoreRepaint {@code true} if the paint messages from the OS 4681 * should be ignored; otherwise {@code false} 4682 * 4683 * @since 1.4 4684 * @see #getIgnoreRepaint 4685 * @see Canvas#createBufferStrategy 4686 * @see Window#createBufferStrategy 4687 * @see java.awt.image.BufferStrategy 4688 * @see GraphicsDevice#setFullScreenWindow 4689 */ 4690 public void setIgnoreRepaint(boolean ignoreRepaint) { 4691 this.ignoreRepaint = ignoreRepaint; 4692 } 4693 4694 /** 4695 * @return whether or not paint messages received from the operating system 4696 * should be ignored. 4697 * 4698 * @since 1.4 4699 * @see #setIgnoreRepaint 4700 */ 4701 public boolean getIgnoreRepaint() { 4702 return ignoreRepaint; 4703 } 4704 4705 /** 4706 * Checks whether this component "contains" the specified point, 4707 * where <code>x</code> and <code>y</code> are defined to be 4708 * relative to the coordinate system of this component. 4709 * 4710 * @param x the <i>x</i> coordinate of the point 4711 * @param y the <i>y</i> coordinate of the point 4712 * @return {@code true} if the point is within the component; 4713 * otherwise {@code false} 4714 * @see #getComponentAt(int, int) 4715 * @since 1.1 4716 */ 4717 public boolean contains(int x, int y) { 4718 return inside(x, y); 4719 } 4720 4721 /** 4722 * Checks whether the point is inside of this component. 4723 * 4724 * @param x the <i>x</i> coordinate of the point 4725 * @param y the <i>y</i> coordinate of the point 4726 * @return {@code true} if the point is within the component; 4727 * otherwise {@code false} 4728 * @deprecated As of JDK version 1.1, 4729 * replaced by contains(int, int). 4730 */ 4731 @Deprecated 4732 public boolean inside(int x, int y) { 4733 return (x >= 0) && (x < width) && (y >= 0) && (y < height); 4734 } 4735 4736 /** 4737 * Checks whether this component "contains" the specified point, 4738 * where the point's <i>x</i> and <i>y</i> coordinates are defined 4739 * to be relative to the coordinate system of this component. 4740 * 4741 * @param p the point 4742 * @return {@code true} if the point is within the component; 4743 * otherwise {@code false} 4744 * @throws NullPointerException if {@code p} is {@code null} 4745 * @see #getComponentAt(Point) 4746 * @since 1.1 4747 */ 4748 public boolean contains(Point p) { 4749 return contains(p.x, p.y); 4750 } 4751 4752 /** 4753 * Determines if this component or one of its immediate 4754 * subcomponents contains the (<i>x</i>, <i>y</i>) location, 4755 * and if so, returns the containing component. This method only 4756 * looks one level deep. If the point (<i>x</i>, <i>y</i>) is 4757 * inside a subcomponent that itself has subcomponents, it does not 4758 * go looking down the subcomponent tree. 4759 * <p> 4760 * The <code>locate</code> method of <code>Component</code> simply 4761 * returns the component itself if the (<i>x</i>, <i>y</i>) 4762 * coordinate location is inside its bounding box, and <code>null</code> 4763 * otherwise. 4764 * @param x the <i>x</i> coordinate 4765 * @param y the <i>y</i> coordinate 4766 * @return the component or subcomponent that contains the 4767 * (<i>x</i>, <i>y</i>) location; 4768 * <code>null</code> if the location 4769 * is outside this component 4770 * @see #contains(int, int) 4771 * @since 1.0 4772 */ 4773 public Component getComponentAt(int x, int y) { 4774 return locate(x, y); 4775 } 4776 4777 /** 4778 * Returns the component occupying the position specified (this component, 4779 * or immediate child component, or null if neither 4780 * of the first two occupies the location). 4781 * 4782 * @param x the <i>x</i> coordinate to search for components at 4783 * @param y the <i>y</i> coordinate to search for components at 4784 * @return the component at the specified location or {@code null} 4785 * @deprecated As of JDK version 1.1, 4786 * replaced by getComponentAt(int, int). 4787 */ 4788 @Deprecated 4789 public Component locate(int x, int y) { 4790 return contains(x, y) ? this : null; 4791 } 4792 4793 /** 4794 * Returns the component or subcomponent that contains the 4795 * specified point. 4796 * @param p the point 4797 * @return the component at the specified location or {@code null} 4798 * @see java.awt.Component#contains 4799 * @since 1.1 4800 */ 4801 public Component getComponentAt(Point p) { 4802 return getComponentAt(p.x, p.y); 4803 } 4804 4805 /** 4806 * @param e the event to deliver 4807 * @deprecated As of JDK version 1.1, 4808 * replaced by <code>dispatchEvent(AWTEvent e)</code>. 4809 */ 4810 @Deprecated 4811 public void deliverEvent(Event e) { 4812 postEvent(e); 4813 } 4814 4815 /** 4816 * Dispatches an event to this component or one of its sub components. 4817 * Calls <code>processEvent</code> before returning for 1.1-style 4818 * events which have been enabled for the <code>Component</code>. 4819 * @param e the event 4820 */ 4821 public final void dispatchEvent(AWTEvent e) { 4822 dispatchEventImpl(e); 4823 } 4824 4825 @SuppressWarnings("deprecation") 4826 void dispatchEventImpl(AWTEvent e) { 4827 int id = e.getID(); 4828 4829 // Check that this component belongs to this app-context 4830 AppContext compContext = appContext; 4831 if (compContext != null && !compContext.equals(AppContext.getAppContext())) { 4832 if (eventLog.isLoggable(PlatformLogger.Level.FINE)) { 4833 eventLog.fine("Event " + e + " is being dispatched on the wrong AppContext"); 4834 } 4835 } 4836 4837 if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) { 4838 eventLog.finest("{0}", e); 4839 } 4840 4841 /* 4842 * 0. Set timestamp and modifiers of current event. 4843 */ 4844 if (!(e instanceof KeyEvent)) { 4845 // Timestamp of a key event is set later in DKFM.preDispatchKeyEvent(KeyEvent). 4846 EventQueue.setCurrentEventAndMostRecentTime(e); 4847 } 4848 4849 /* 4850 * 1. Pre-dispatchers. Do any necessary retargeting/reordering here 4851 * before we notify AWTEventListeners. 4852 */ 4853 4854 if (e instanceof SunDropTargetEvent) { 4855 ((SunDropTargetEvent)e).dispatch(); 4856 return; 4857 } 4858 4859 if (!e.focusManagerIsDispatching) { 4860 // Invoke the private focus retargeting method which provides 4861 // lightweight Component support 4862 if (e.isPosted) { 4863 e = KeyboardFocusManager.retargetFocusEvent(e); 4864 e.isPosted = true; 4865 } 4866 4867 // Now, with the event properly targeted to a lightweight 4868 // descendant if necessary, invoke the public focus retargeting 4869 // and dispatching function 4870 if (KeyboardFocusManager.getCurrentKeyboardFocusManager(). 4871 dispatchEvent(e)) 4872 { 4873 return; 4874 } 4875 } 4876 if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 4877 focusLog.finest("" + e); 4878 } 4879 // MouseWheel may need to be retargeted here so that 4880 // AWTEventListener sees the event go to the correct 4881 // Component. If the MouseWheelEvent needs to go to an ancestor, 4882 // the event is dispatched to the ancestor, and dispatching here 4883 // stops. 4884 if (id == MouseEvent.MOUSE_WHEEL && 4885 (!eventTypeEnabled(id)) && 4886 (peer != null && !peer.handlesWheelScrolling()) && 4887 (dispatchMouseWheelToAncestor((MouseWheelEvent)e))) 4888 { 4889 return; 4890 } 4891 4892 /* 4893 * 2. Allow the Toolkit to pass this to AWTEventListeners. 4894 */ 4895 Toolkit toolkit = Toolkit.getDefaultToolkit(); 4896 toolkit.notifyAWTEventListeners(e); 4897 4898 4899 /* 4900 * 3. If no one has consumed a key event, allow the 4901 * KeyboardFocusManager to process it. 4902 */ 4903 if (!e.isConsumed()) { 4904 if (e instanceof java.awt.event.KeyEvent) { 4905 KeyboardFocusManager.getCurrentKeyboardFocusManager(). 4906 processKeyEvent(this, (KeyEvent)e); 4907 if (e.isConsumed()) { 4908 return; 4909 } 4910 } 4911 } 4912 4913 /* 4914 * 4. Allow input methods to process the event 4915 */ 4916 if (areInputMethodsEnabled()) { 4917 // We need to pass on InputMethodEvents since some host 4918 // input method adapters send them through the Java 4919 // event queue instead of directly to the component, 4920 // and the input context also handles the Java composition window 4921 if(((e instanceof InputMethodEvent) && !(this instanceof CompositionArea)) 4922 || 4923 // Otherwise, we only pass on input and focus events, because 4924 // a) input methods shouldn't know about semantic or component-level events 4925 // b) passing on the events takes time 4926 // c) isConsumed() is always true for semantic events. 4927 (e instanceof InputEvent) || (e instanceof FocusEvent)) { 4928 InputContext inputContext = getInputContext(); 4929 4930 4931 if (inputContext != null) { 4932 inputContext.dispatchEvent(e); 4933 if (e.isConsumed()) { 4934 if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 4935 focusLog.finest("3579: Skipping " + e); 4936 } 4937 return; 4938 } 4939 } 4940 } 4941 } else { 4942 // When non-clients get focus, we need to explicitly disable the native 4943 // input method. The native input method is actually not disabled when 4944 // the active/passive/peered clients loose focus. 4945 if (id == FocusEvent.FOCUS_GAINED) { 4946 InputContext inputContext = getInputContext(); 4947 if (inputContext != null && inputContext instanceof sun.awt.im.InputContext) { 4948 ((sun.awt.im.InputContext)inputContext).disableNativeIM(); 4949 } 4950 } 4951 } 4952 4953 4954 /* 4955 * 5. Pre-process any special events before delivery 4956 */ 4957 switch(id) { 4958 // Handling of the PAINT and UPDATE events is now done in the 4959 // peer's handleEvent() method so the background can be cleared 4960 // selectively for non-native components on Windows only. 4961 // - Fred.Ecks@Eng.sun.com, 5-8-98 4962 4963 case KeyEvent.KEY_PRESSED: 4964 case KeyEvent.KEY_RELEASED: 4965 Container p = (Container)((this instanceof Container) ? this : parent); 4966 if (p != null) { 4967 p.preProcessKeyEvent((KeyEvent)e); 4968 if (e.isConsumed()) { 4969 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 4970 focusLog.finest("Pre-process consumed event"); 4971 } 4972 return; 4973 } 4974 } 4975 break; 4976 4977 default: 4978 break; 4979 } 4980 4981 /* 4982 * 6. Deliver event for normal processing 4983 */ 4984 if (newEventsOnly) { 4985 // Filtering needs to really be moved to happen at a lower 4986 // level in order to get maximum performance gain; it is 4987 // here temporarily to ensure the API spec is honored. 4988 // 4989 if (eventEnabled(e)) { 4990 processEvent(e); 4991 } 4992 } else if (id == MouseEvent.MOUSE_WHEEL) { 4993 // newEventsOnly will be false for a listenerless ScrollPane, but 4994 // MouseWheelEvents still need to be dispatched to it so scrolling 4995 // can be done. 4996 autoProcessMouseWheel((MouseWheelEvent)e); 4997 } else if (!(e instanceof MouseEvent && !postsOldMouseEvents())) { 4998 // 4999 // backward compatibility 5000 // 5001 Event olde = e.convertToOld(); 5002 if (olde != null) { 5003 int key = olde.key; 5004 int modifiers = olde.modifiers; 5005 5006 postEvent(olde); 5007 if (olde.isConsumed()) { 5008 e.consume(); 5009 } 5010 // if target changed key or modifier values, copy them 5011 // back to original event 5012 // 5013 switch(olde.id) { 5014 case Event.KEY_PRESS: 5015 case Event.KEY_RELEASE: 5016 case Event.KEY_ACTION: 5017 case Event.KEY_ACTION_RELEASE: 5018 if (olde.key != key) { 5019 ((KeyEvent)e).setKeyChar(olde.getKeyEventChar()); 5020 } 5021 if (olde.modifiers != modifiers) { 5022 ((KeyEvent)e).setModifiers(olde.modifiers); 5023 } 5024 break; 5025 default: 5026 break; 5027 } 5028 } 5029 } 5030 5031 /* 5032 * 9. Allow the peer to process the event. 5033 * Except KeyEvents, they will be processed by peer after 5034 * all KeyEventPostProcessors 5035 * (see DefaultKeyboardFocusManager.dispatchKeyEvent()) 5036 */ 5037 if (!(e instanceof KeyEvent)) { 5038 ComponentPeer tpeer = peer; 5039 if (e instanceof FocusEvent && (tpeer == null || tpeer instanceof LightweightPeer)) { 5040 // if focus owner is lightweight then its native container 5041 // processes event 5042 Component source = (Component)e.getSource(); 5043 if (source != null) { 5044 Container target = source.getNativeContainer(); 5045 if (target != null) { 5046 tpeer = target.peer; 5047 } 5048 } 5049 } 5050 if (tpeer != null) { 5051 tpeer.handleEvent(e); 5052 } 5053 } 5054 } // dispatchEventImpl() 5055 5056 /* 5057 * If newEventsOnly is false, method is called so that ScrollPane can 5058 * override it and handle common-case mouse wheel scrolling. NOP 5059 * for Component. 5060 */ 5061 void autoProcessMouseWheel(MouseWheelEvent e) {} 5062 5063 /* 5064 * Dispatch given MouseWheelEvent to the first ancestor for which 5065 * MouseWheelEvents are enabled. 5066 * 5067 * Returns whether or not event was dispatched to an ancestor 5068 */ 5069 boolean dispatchMouseWheelToAncestor(MouseWheelEvent e) { 5070 int newX, newY; 5071 newX = e.getX() + getX(); // Coordinates take into account at least 5072 newY = e.getY() + getY(); // the cursor's position relative to this 5073 // Component (e.getX()), and this Component's 5074 // position relative to its parent. 5075 MouseWheelEvent newMWE; 5076 5077 if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) { 5078 eventLog.finest("dispatchMouseWheelToAncestor"); 5079 eventLog.finest("orig event src is of " + e.getSource().getClass()); 5080 } 5081 5082 /* parent field for Window refers to the owning Window. 5083 * MouseWheelEvents should NOT be propagated into owning Windows 5084 */ 5085 synchronized (getTreeLock()) { 5086 Container anc = getParent(); 5087 while (anc != null && !anc.eventEnabled(e)) { 5088 // fix coordinates to be relative to new event source 5089 newX += anc.getX(); 5090 newY += anc.getY(); 5091 5092 if (!(anc instanceof Window)) { 5093 anc = anc.getParent(); 5094 } 5095 else { 5096 break; 5097 } 5098 } 5099 5100 if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) { 5101 eventLog.finest("new event src is " + anc.getClass()); 5102 } 5103 5104 if (anc != null && anc.eventEnabled(e)) { 5105 // Change event to be from new source, with new x,y 5106 // For now, just create a new event - yucky 5107 5108 newMWE = new MouseWheelEvent(anc, // new source 5109 e.getID(), 5110 e.getWhen(), 5111 e.getModifiers(), 5112 newX, // x relative to new source 5113 newY, // y relative to new source 5114 e.getXOnScreen(), 5115 e.getYOnScreen(), 5116 e.getClickCount(), 5117 e.isPopupTrigger(), 5118 e.getScrollType(), 5119 e.getScrollAmount(), 5120 e.getWheelRotation(), 5121 e.getPreciseWheelRotation()); 5122 ((AWTEvent)e).copyPrivateDataInto(newMWE); 5123 // When dispatching a wheel event to 5124 // ancestor, there is no need trying to find descendant 5125 // lightweights to dispatch event to. 5126 // If we dispatch the event to toplevel ancestor, 5127 // this could enclose the loop: 6480024. 5128 anc.dispatchEventToSelf(newMWE); 5129 if (newMWE.isConsumed()) { 5130 e.consume(); 5131 } 5132 return true; 5133 } 5134 } 5135 return false; 5136 } 5137 5138 boolean areInputMethodsEnabled() { 5139 // in 1.2, we assume input method support is required for all 5140 // components that handle key events, but components can turn off 5141 // input methods by calling enableInputMethods(false). 5142 return ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) && 5143 ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 || keyListener != null); 5144 } 5145 5146 // REMIND: remove when filtering is handled at lower level 5147 boolean eventEnabled(AWTEvent e) { 5148 return eventTypeEnabled(e.id); 5149 } 5150 5151 boolean eventTypeEnabled(int type) { 5152 switch(type) { 5153 case ComponentEvent.COMPONENT_MOVED: 5154 case ComponentEvent.COMPONENT_RESIZED: 5155 case ComponentEvent.COMPONENT_SHOWN: 5156 case ComponentEvent.COMPONENT_HIDDEN: 5157 if ((eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 || 5158 componentListener != null) { 5159 return true; 5160 } 5161 break; 5162 case FocusEvent.FOCUS_GAINED: 5163 case FocusEvent.FOCUS_LOST: 5164 if ((eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 || 5165 focusListener != null) { 5166 return true; 5167 } 5168 break; 5169 case KeyEvent.KEY_PRESSED: 5170 case KeyEvent.KEY_RELEASED: 5171 case KeyEvent.KEY_TYPED: 5172 if ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 || 5173 keyListener != null) { 5174 return true; 5175 } 5176 break; 5177 case MouseEvent.MOUSE_PRESSED: 5178 case MouseEvent.MOUSE_RELEASED: 5179 case MouseEvent.MOUSE_ENTERED: 5180 case MouseEvent.MOUSE_EXITED: 5181 case MouseEvent.MOUSE_CLICKED: 5182 if ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 || 5183 mouseListener != null) { 5184 return true; 5185 } 5186 break; 5187 case MouseEvent.MOUSE_MOVED: 5188 case MouseEvent.MOUSE_DRAGGED: 5189 if ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 || 5190 mouseMotionListener != null) { 5191 return true; 5192 } 5193 break; 5194 case MouseEvent.MOUSE_WHEEL: 5195 if ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 || 5196 mouseWheelListener != null) { 5197 return true; 5198 } 5199 break; 5200 case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED: 5201 case InputMethodEvent.CARET_POSITION_CHANGED: 5202 if ((eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 || 5203 inputMethodListener != null) { 5204 return true; 5205 } 5206 break; 5207 case HierarchyEvent.HIERARCHY_CHANGED: 5208 if ((eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 || 5209 hierarchyListener != null) { 5210 return true; 5211 } 5212 break; 5213 case HierarchyEvent.ANCESTOR_MOVED: 5214 case HierarchyEvent.ANCESTOR_RESIZED: 5215 if ((eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 || 5216 hierarchyBoundsListener != null) { 5217 return true; 5218 } 5219 break; 5220 case ActionEvent.ACTION_PERFORMED: 5221 if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0) { 5222 return true; 5223 } 5224 break; 5225 case TextEvent.TEXT_VALUE_CHANGED: 5226 if ((eventMask & AWTEvent.TEXT_EVENT_MASK) != 0) { 5227 return true; 5228 } 5229 break; 5230 case ItemEvent.ITEM_STATE_CHANGED: 5231 if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0) { 5232 return true; 5233 } 5234 break; 5235 case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED: 5236 if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0) { 5237 return true; 5238 } 5239 break; 5240 default: 5241 break; 5242 } 5243 // 5244 // Always pass on events defined by external programs. 5245 // 5246 if (type > AWTEvent.RESERVED_ID_MAX) { 5247 return true; 5248 } 5249 return false; 5250 } 5251 5252 /** 5253 * @deprecated As of JDK version 1.1, 5254 * replaced by dispatchEvent(AWTEvent). 5255 */ 5256 @Deprecated 5257 public boolean postEvent(Event e) { 5258 ComponentPeer peer = this.peer; 5259 5260 if (handleEvent(e)) { 5261 e.consume(); 5262 return true; 5263 } 5264 5265 Component parent = this.parent; 5266 int eventx = e.x; 5267 int eventy = e.y; 5268 if (parent != null) { 5269 e.translate(x, y); 5270 if (parent.postEvent(e)) { 5271 e.consume(); 5272 return true; 5273 } 5274 // restore coords 5275 e.x = eventx; 5276 e.y = eventy; 5277 } 5278 return false; 5279 } 5280 5281 // Event source interfaces 5282 5283 /** 5284 * Adds the specified component listener to receive component events from 5285 * this component. 5286 * If listener <code>l</code> is <code>null</code>, 5287 * no exception is thrown and no action is performed. 5288 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5289 * >AWT Threading Issues</a> for details on AWT's threading model. 5290 * 5291 * @param l the component listener 5292 * @see java.awt.event.ComponentEvent 5293 * @see java.awt.event.ComponentListener 5294 * @see #removeComponentListener 5295 * @see #getComponentListeners 5296 * @since 1.1 5297 */ 5298 public synchronized void addComponentListener(ComponentListener l) { 5299 if (l == null) { 5300 return; 5301 } 5302 componentListener = AWTEventMulticaster.add(componentListener, l); 5303 newEventsOnly = true; 5304 } 5305 5306 /** 5307 * Removes the specified component listener so that it no longer 5308 * receives component events from this component. This method performs 5309 * no function, nor does it throw an exception, if the listener 5310 * specified by the argument was not previously added to this component. 5311 * If listener <code>l</code> is <code>null</code>, 5312 * no exception is thrown and no action is performed. 5313 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5314 * >AWT Threading Issues</a> for details on AWT's threading model. 5315 * @param l the component listener 5316 * @see java.awt.event.ComponentEvent 5317 * @see java.awt.event.ComponentListener 5318 * @see #addComponentListener 5319 * @see #getComponentListeners 5320 * @since 1.1 5321 */ 5322 public synchronized void removeComponentListener(ComponentListener l) { 5323 if (l == null) { 5324 return; 5325 } 5326 componentListener = AWTEventMulticaster.remove(componentListener, l); 5327 } 5328 5329 /** 5330 * Returns an array of all the component listeners 5331 * registered on this component. 5332 * 5333 * @return all <code>ComponentListener</code>s of this component 5334 * or an empty array if no component 5335 * listeners are currently registered 5336 * 5337 * @see #addComponentListener 5338 * @see #removeComponentListener 5339 * @since 1.4 5340 */ 5341 public synchronized ComponentListener[] getComponentListeners() { 5342 return getListeners(ComponentListener.class); 5343 } 5344 5345 /** 5346 * Adds the specified focus listener to receive focus events from 5347 * this component when this component gains input focus. 5348 * If listener <code>l</code> is <code>null</code>, 5349 * no exception is thrown and no action is performed. 5350 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5351 * >AWT Threading Issues</a> for details on AWT's threading model. 5352 * 5353 * @param l the focus listener 5354 * @see java.awt.event.FocusEvent 5355 * @see java.awt.event.FocusListener 5356 * @see #removeFocusListener 5357 * @see #getFocusListeners 5358 * @since 1.1 5359 */ 5360 public synchronized void addFocusListener(FocusListener l) { 5361 if (l == null) { 5362 return; 5363 } 5364 focusListener = AWTEventMulticaster.add(focusListener, l); 5365 newEventsOnly = true; 5366 5367 // if this is a lightweight component, enable focus events 5368 // in the native container. 5369 if (peer instanceof LightweightPeer) { 5370 parent.proxyEnableEvents(AWTEvent.FOCUS_EVENT_MASK); 5371 } 5372 } 5373 5374 /** 5375 * Removes the specified focus listener so that it no longer 5376 * receives focus events from this component. This method performs 5377 * no function, nor does it throw an exception, if the listener 5378 * specified by the argument was not previously added to this component. 5379 * If listener <code>l</code> is <code>null</code>, 5380 * no exception is thrown and no action is performed. 5381 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5382 * >AWT Threading Issues</a> for details on AWT's threading model. 5383 * 5384 * @param l the focus listener 5385 * @see java.awt.event.FocusEvent 5386 * @see java.awt.event.FocusListener 5387 * @see #addFocusListener 5388 * @see #getFocusListeners 5389 * @since 1.1 5390 */ 5391 public synchronized void removeFocusListener(FocusListener l) { 5392 if (l == null) { 5393 return; 5394 } 5395 focusListener = AWTEventMulticaster.remove(focusListener, l); 5396 } 5397 5398 /** 5399 * Returns an array of all the focus listeners 5400 * registered on this component. 5401 * 5402 * @return all of this component's <code>FocusListener</code>s 5403 * or an empty array if no component 5404 * listeners are currently registered 5405 * 5406 * @see #addFocusListener 5407 * @see #removeFocusListener 5408 * @since 1.4 5409 */ 5410 public synchronized FocusListener[] getFocusListeners() { 5411 return getListeners(FocusListener.class); 5412 } 5413 5414 /** 5415 * Adds the specified hierarchy listener to receive hierarchy changed 5416 * events from this component when the hierarchy to which this container 5417 * belongs changes. 5418 * If listener <code>l</code> is <code>null</code>, 5419 * no exception is thrown and no action is performed. 5420 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5421 * >AWT Threading Issues</a> for details on AWT's threading model. 5422 * 5423 * @param l the hierarchy listener 5424 * @see java.awt.event.HierarchyEvent 5425 * @see java.awt.event.HierarchyListener 5426 * @see #removeHierarchyListener 5427 * @see #getHierarchyListeners 5428 * @since 1.3 5429 */ 5430 public void addHierarchyListener(HierarchyListener l) { 5431 if (l == null) { 5432 return; 5433 } 5434 boolean notifyAncestors; 5435 synchronized (this) { 5436 notifyAncestors = 5437 (hierarchyListener == null && 5438 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0); 5439 hierarchyListener = AWTEventMulticaster.add(hierarchyListener, l); 5440 notifyAncestors = (notifyAncestors && hierarchyListener != null); 5441 newEventsOnly = true; 5442 } 5443 if (notifyAncestors) { 5444 synchronized (getTreeLock()) { 5445 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK, 5446 1); 5447 } 5448 } 5449 } 5450 5451 /** 5452 * Removes the specified hierarchy listener so that it no longer 5453 * receives hierarchy changed events from this component. This method 5454 * performs no function, nor does it throw an exception, if the listener 5455 * specified by the argument was not previously added to this component. 5456 * If listener <code>l</code> is <code>null</code>, 5457 * no exception is thrown and no action is performed. 5458 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5459 * >AWT Threading Issues</a> for details on AWT's threading model. 5460 * 5461 * @param l the hierarchy listener 5462 * @see java.awt.event.HierarchyEvent 5463 * @see java.awt.event.HierarchyListener 5464 * @see #addHierarchyListener 5465 * @see #getHierarchyListeners 5466 * @since 1.3 5467 */ 5468 public void removeHierarchyListener(HierarchyListener l) { 5469 if (l == null) { 5470 return; 5471 } 5472 boolean notifyAncestors; 5473 synchronized (this) { 5474 notifyAncestors = 5475 (hierarchyListener != null && 5476 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0); 5477 hierarchyListener = 5478 AWTEventMulticaster.remove(hierarchyListener, l); 5479 notifyAncestors = (notifyAncestors && hierarchyListener == null); 5480 } 5481 if (notifyAncestors) { 5482 synchronized (getTreeLock()) { 5483 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK, 5484 -1); 5485 } 5486 } 5487 } 5488 5489 /** 5490 * Returns an array of all the hierarchy listeners 5491 * registered on this component. 5492 * 5493 * @return all of this component's <code>HierarchyListener</code>s 5494 * or an empty array if no hierarchy 5495 * listeners are currently registered 5496 * 5497 * @see #addHierarchyListener 5498 * @see #removeHierarchyListener 5499 * @since 1.4 5500 */ 5501 public synchronized HierarchyListener[] getHierarchyListeners() { 5502 return getListeners(HierarchyListener.class); 5503 } 5504 5505 /** 5506 * Adds the specified hierarchy bounds listener to receive hierarchy 5507 * bounds events from this component when the hierarchy to which this 5508 * container belongs changes. 5509 * If listener <code>l</code> is <code>null</code>, 5510 * no exception is thrown and no action is performed. 5511 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5512 * >AWT Threading Issues</a> for details on AWT's threading model. 5513 * 5514 * @param l the hierarchy bounds listener 5515 * @see java.awt.event.HierarchyEvent 5516 * @see java.awt.event.HierarchyBoundsListener 5517 * @see #removeHierarchyBoundsListener 5518 * @see #getHierarchyBoundsListeners 5519 * @since 1.3 5520 */ 5521 public void addHierarchyBoundsListener(HierarchyBoundsListener l) { 5522 if (l == null) { 5523 return; 5524 } 5525 boolean notifyAncestors; 5526 synchronized (this) { 5527 notifyAncestors = 5528 (hierarchyBoundsListener == null && 5529 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0); 5530 hierarchyBoundsListener = 5531 AWTEventMulticaster.add(hierarchyBoundsListener, l); 5532 notifyAncestors = (notifyAncestors && 5533 hierarchyBoundsListener != null); 5534 newEventsOnly = true; 5535 } 5536 if (notifyAncestors) { 5537 synchronized (getTreeLock()) { 5538 adjustListeningChildrenOnParent( 5539 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, 1); 5540 } 5541 } 5542 } 5543 5544 /** 5545 * Removes the specified hierarchy bounds listener so that it no longer 5546 * receives hierarchy bounds events from this component. This method 5547 * performs no function, nor does it throw an exception, if the listener 5548 * specified by the argument was not previously added to this component. 5549 * If listener <code>l</code> is <code>null</code>, 5550 * no exception is thrown and no action is performed. 5551 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5552 * >AWT Threading Issues</a> for details on AWT's threading model. 5553 * 5554 * @param l the hierarchy bounds listener 5555 * @see java.awt.event.HierarchyEvent 5556 * @see java.awt.event.HierarchyBoundsListener 5557 * @see #addHierarchyBoundsListener 5558 * @see #getHierarchyBoundsListeners 5559 * @since 1.3 5560 */ 5561 public void removeHierarchyBoundsListener(HierarchyBoundsListener l) { 5562 if (l == null) { 5563 return; 5564 } 5565 boolean notifyAncestors; 5566 synchronized (this) { 5567 notifyAncestors = 5568 (hierarchyBoundsListener != null && 5569 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0); 5570 hierarchyBoundsListener = 5571 AWTEventMulticaster.remove(hierarchyBoundsListener, l); 5572 notifyAncestors = (notifyAncestors && 5573 hierarchyBoundsListener == null); 5574 } 5575 if (notifyAncestors) { 5576 synchronized (getTreeLock()) { 5577 adjustListeningChildrenOnParent( 5578 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, -1); 5579 } 5580 } 5581 } 5582 5583 // Should only be called while holding the tree lock 5584 int numListening(long mask) { 5585 // One mask or the other, but not neither or both. 5586 if (eventLog.isLoggable(PlatformLogger.Level.FINE)) { 5587 if ((mask != AWTEvent.HIERARCHY_EVENT_MASK) && 5588 (mask != AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK)) 5589 { 5590 eventLog.fine("Assertion failed"); 5591 } 5592 } 5593 if ((mask == AWTEvent.HIERARCHY_EVENT_MASK && 5594 (hierarchyListener != null || 5595 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0)) || 5596 (mask == AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK && 5597 (hierarchyBoundsListener != null || 5598 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0))) { 5599 return 1; 5600 } else { 5601 return 0; 5602 } 5603 } 5604 5605 // Should only be called while holding tree lock 5606 int countHierarchyMembers() { 5607 return 1; 5608 } 5609 // Should only be called while holding the tree lock 5610 int createHierarchyEvents(int id, Component changed, 5611 Container changedParent, long changeFlags, 5612 boolean enabledOnToolkit) { 5613 switch (id) { 5614 case HierarchyEvent.HIERARCHY_CHANGED: 5615 if (hierarchyListener != null || 5616 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 || 5617 enabledOnToolkit) { 5618 HierarchyEvent e = new HierarchyEvent(this, id, changed, 5619 changedParent, 5620 changeFlags); 5621 dispatchEvent(e); 5622 return 1; 5623 } 5624 break; 5625 case HierarchyEvent.ANCESTOR_MOVED: 5626 case HierarchyEvent.ANCESTOR_RESIZED: 5627 if (eventLog.isLoggable(PlatformLogger.Level.FINE)) { 5628 if (changeFlags != 0) { 5629 eventLog.fine("Assertion (changeFlags == 0) failed"); 5630 } 5631 } 5632 if (hierarchyBoundsListener != null || 5633 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 || 5634 enabledOnToolkit) { 5635 HierarchyEvent e = new HierarchyEvent(this, id, changed, 5636 changedParent); 5637 dispatchEvent(e); 5638 return 1; 5639 } 5640 break; 5641 default: 5642 // assert false 5643 if (eventLog.isLoggable(PlatformLogger.Level.FINE)) { 5644 eventLog.fine("This code must never be reached"); 5645 } 5646 break; 5647 } 5648 return 0; 5649 } 5650 5651 /** 5652 * Returns an array of all the hierarchy bounds listeners 5653 * registered on this component. 5654 * 5655 * @return all of this component's <code>HierarchyBoundsListener</code>s 5656 * or an empty array if no hierarchy bounds 5657 * listeners are currently registered 5658 * 5659 * @see #addHierarchyBoundsListener 5660 * @see #removeHierarchyBoundsListener 5661 * @since 1.4 5662 */ 5663 public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners() { 5664 return getListeners(HierarchyBoundsListener.class); 5665 } 5666 5667 /* 5668 * Should only be called while holding the tree lock. 5669 * It's added only for overriding in java.awt.Window 5670 * because parent in Window is owner. 5671 */ 5672 void adjustListeningChildrenOnParent(long mask, int num) { 5673 if (parent != null) { 5674 parent.adjustListeningChildren(mask, num); 5675 } 5676 } 5677 5678 /** 5679 * Adds the specified key listener to receive key events from 5680 * this component. 5681 * If l is null, no exception is thrown and no action is performed. 5682 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5683 * >AWT Threading Issues</a> for details on AWT's threading model. 5684 * 5685 * @param l the key listener. 5686 * @see java.awt.event.KeyEvent 5687 * @see java.awt.event.KeyListener 5688 * @see #removeKeyListener 5689 * @see #getKeyListeners 5690 * @since 1.1 5691 */ 5692 public synchronized void addKeyListener(KeyListener l) { 5693 if (l == null) { 5694 return; 5695 } 5696 keyListener = AWTEventMulticaster.add(keyListener, l); 5697 newEventsOnly = true; 5698 5699 // if this is a lightweight component, enable key events 5700 // in the native container. 5701 if (peer instanceof LightweightPeer) { 5702 parent.proxyEnableEvents(AWTEvent.KEY_EVENT_MASK); 5703 } 5704 } 5705 5706 /** 5707 * Removes the specified key listener so that it no longer 5708 * receives key events from this component. This method performs 5709 * no function, nor does it throw an exception, if the listener 5710 * specified by the argument was not previously added to this component. 5711 * If listener <code>l</code> is <code>null</code>, 5712 * no exception is thrown and no action is performed. 5713 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5714 * >AWT Threading Issues</a> for details on AWT's threading model. 5715 * 5716 * @param l the key listener 5717 * @see java.awt.event.KeyEvent 5718 * @see java.awt.event.KeyListener 5719 * @see #addKeyListener 5720 * @see #getKeyListeners 5721 * @since 1.1 5722 */ 5723 public synchronized void removeKeyListener(KeyListener l) { 5724 if (l == null) { 5725 return; 5726 } 5727 keyListener = AWTEventMulticaster.remove(keyListener, l); 5728 } 5729 5730 /** 5731 * Returns an array of all the key listeners 5732 * registered on this component. 5733 * 5734 * @return all of this component's <code>KeyListener</code>s 5735 * or an empty array if no key 5736 * listeners are currently registered 5737 * 5738 * @see #addKeyListener 5739 * @see #removeKeyListener 5740 * @since 1.4 5741 */ 5742 public synchronized KeyListener[] getKeyListeners() { 5743 return getListeners(KeyListener.class); 5744 } 5745 5746 /** 5747 * Adds the specified mouse listener to receive mouse events from 5748 * this component. 5749 * If listener <code>l</code> is <code>null</code>, 5750 * no exception is thrown and no action is performed. 5751 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5752 * >AWT Threading Issues</a> for details on AWT's threading model. 5753 * 5754 * @param l the mouse listener 5755 * @see java.awt.event.MouseEvent 5756 * @see java.awt.event.MouseListener 5757 * @see #removeMouseListener 5758 * @see #getMouseListeners 5759 * @since 1.1 5760 */ 5761 public synchronized void addMouseListener(MouseListener l) { 5762 if (l == null) { 5763 return; 5764 } 5765 mouseListener = AWTEventMulticaster.add(mouseListener,l); 5766 newEventsOnly = true; 5767 5768 // if this is a lightweight component, enable mouse events 5769 // in the native container. 5770 if (peer instanceof LightweightPeer) { 5771 parent.proxyEnableEvents(AWTEvent.MOUSE_EVENT_MASK); 5772 } 5773 } 5774 5775 /** 5776 * Removes the specified mouse listener so that it no longer 5777 * receives mouse events from this component. This method performs 5778 * no function, nor does it throw an exception, if the listener 5779 * specified by the argument was not previously added to this component. 5780 * If listener <code>l</code> is <code>null</code>, 5781 * no exception is thrown and no action is performed. 5782 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5783 * >AWT Threading Issues</a> for details on AWT's threading model. 5784 * 5785 * @param l the mouse listener 5786 * @see java.awt.event.MouseEvent 5787 * @see java.awt.event.MouseListener 5788 * @see #addMouseListener 5789 * @see #getMouseListeners 5790 * @since 1.1 5791 */ 5792 public synchronized void removeMouseListener(MouseListener l) { 5793 if (l == null) { 5794 return; 5795 } 5796 mouseListener = AWTEventMulticaster.remove(mouseListener, l); 5797 } 5798 5799 /** 5800 * Returns an array of all the mouse listeners 5801 * registered on this component. 5802 * 5803 * @return all of this component's <code>MouseListener</code>s 5804 * or an empty array if no mouse 5805 * listeners are currently registered 5806 * 5807 * @see #addMouseListener 5808 * @see #removeMouseListener 5809 * @since 1.4 5810 */ 5811 public synchronized MouseListener[] getMouseListeners() { 5812 return getListeners(MouseListener.class); 5813 } 5814 5815 /** 5816 * Adds the specified mouse motion listener to receive mouse motion 5817 * events from this component. 5818 * If listener <code>l</code> is <code>null</code>, 5819 * no exception is thrown and no action is performed. 5820 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5821 * >AWT Threading Issues</a> for details on AWT's threading model. 5822 * 5823 * @param l the mouse motion listener 5824 * @see java.awt.event.MouseEvent 5825 * @see java.awt.event.MouseMotionListener 5826 * @see #removeMouseMotionListener 5827 * @see #getMouseMotionListeners 5828 * @since 1.1 5829 */ 5830 public synchronized void addMouseMotionListener(MouseMotionListener l) { 5831 if (l == null) { 5832 return; 5833 } 5834 mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener,l); 5835 newEventsOnly = true; 5836 5837 // if this is a lightweight component, enable mouse events 5838 // in the native container. 5839 if (peer instanceof LightweightPeer) { 5840 parent.proxyEnableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK); 5841 } 5842 } 5843 5844 /** 5845 * Removes the specified mouse motion listener so that it no longer 5846 * receives mouse motion events from this component. This method performs 5847 * no function, nor does it throw an exception, if the listener 5848 * specified by the argument was not previously added to this component. 5849 * If listener <code>l</code> is <code>null</code>, 5850 * no exception is thrown and no action is performed. 5851 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5852 * >AWT Threading Issues</a> for details on AWT's threading model. 5853 * 5854 * @param l the mouse motion listener 5855 * @see java.awt.event.MouseEvent 5856 * @see java.awt.event.MouseMotionListener 5857 * @see #addMouseMotionListener 5858 * @see #getMouseMotionListeners 5859 * @since 1.1 5860 */ 5861 public synchronized void removeMouseMotionListener(MouseMotionListener l) { 5862 if (l == null) { 5863 return; 5864 } 5865 mouseMotionListener = AWTEventMulticaster.remove(mouseMotionListener, l); 5866 } 5867 5868 /** 5869 * Returns an array of all the mouse motion listeners 5870 * registered on this component. 5871 * 5872 * @return all of this component's <code>MouseMotionListener</code>s 5873 * or an empty array if no mouse motion 5874 * listeners are currently registered 5875 * 5876 * @see #addMouseMotionListener 5877 * @see #removeMouseMotionListener 5878 * @since 1.4 5879 */ 5880 public synchronized MouseMotionListener[] getMouseMotionListeners() { 5881 return getListeners(MouseMotionListener.class); 5882 } 5883 5884 /** 5885 * Adds the specified mouse wheel listener to receive mouse wheel events 5886 * from this component. Containers also receive mouse wheel events from 5887 * sub-components. 5888 * <p> 5889 * For information on how mouse wheel events are dispatched, see 5890 * the class description for {@link MouseWheelEvent}. 5891 * <p> 5892 * If l is <code>null</code>, no exception is thrown and no 5893 * action is performed. 5894 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5895 * >AWT Threading Issues</a> for details on AWT's threading model. 5896 * 5897 * @param l the mouse wheel listener 5898 * @see java.awt.event.MouseWheelEvent 5899 * @see java.awt.event.MouseWheelListener 5900 * @see #removeMouseWheelListener 5901 * @see #getMouseWheelListeners 5902 * @since 1.4 5903 */ 5904 public synchronized void addMouseWheelListener(MouseWheelListener l) { 5905 if (l == null) { 5906 return; 5907 } 5908 mouseWheelListener = AWTEventMulticaster.add(mouseWheelListener,l); 5909 newEventsOnly = true; 5910 5911 // if this is a lightweight component, enable mouse events 5912 // in the native container. 5913 if (peer instanceof LightweightPeer) { 5914 parent.proxyEnableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK); 5915 } 5916 } 5917 5918 /** 5919 * Removes the specified mouse wheel listener so that it no longer 5920 * receives mouse wheel events from this component. This method performs 5921 * no function, nor does it throw an exception, if the listener 5922 * specified by the argument was not previously added to this component. 5923 * If l is null, no exception is thrown and no action is performed. 5924 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5925 * >AWT Threading Issues</a> for details on AWT's threading model. 5926 * 5927 * @param l the mouse wheel listener. 5928 * @see java.awt.event.MouseWheelEvent 5929 * @see java.awt.event.MouseWheelListener 5930 * @see #addMouseWheelListener 5931 * @see #getMouseWheelListeners 5932 * @since 1.4 5933 */ 5934 public synchronized void removeMouseWheelListener(MouseWheelListener l) { 5935 if (l == null) { 5936 return; 5937 } 5938 mouseWheelListener = AWTEventMulticaster.remove(mouseWheelListener, l); 5939 } 5940 5941 /** 5942 * Returns an array of all the mouse wheel listeners 5943 * registered on this component. 5944 * 5945 * @return all of this component's <code>MouseWheelListener</code>s 5946 * or an empty array if no mouse wheel 5947 * listeners are currently registered 5948 * 5949 * @see #addMouseWheelListener 5950 * @see #removeMouseWheelListener 5951 * @since 1.4 5952 */ 5953 public synchronized MouseWheelListener[] getMouseWheelListeners() { 5954 return getListeners(MouseWheelListener.class); 5955 } 5956 5957 /** 5958 * Adds the specified input method listener to receive 5959 * input method events from this component. A component will 5960 * only receive input method events from input methods 5961 * if it also overrides <code>getInputMethodRequests</code> to return an 5962 * <code>InputMethodRequests</code> instance. 5963 * If listener <code>l</code> is <code>null</code>, 5964 * no exception is thrown and no action is performed. 5965 * <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads" 5966 * >AWT Threading Issues</a> for details on AWT's threading model. 5967 * 5968 * @param l the input method listener 5969 * @see java.awt.event.InputMethodEvent 5970 * @see java.awt.event.InputMethodListener 5971 * @see #removeInputMethodListener 5972 * @see #getInputMethodListeners 5973 * @see #getInputMethodRequests 5974 * @since 1.2 5975 */ 5976 public synchronized void addInputMethodListener(InputMethodListener l) { 5977 if (l == null) { 5978 return; 5979 } 5980 inputMethodListener = AWTEventMulticaster.add(inputMethodListener, l); 5981 newEventsOnly = true; 5982 } 5983 5984 /** 5985 * Removes the specified input method listener so that it no longer 5986 * receives input method events from this component. This method performs 5987 * no function, nor does it throw an exception, if the listener 5988 * specified by the argument was not previously added to this component. 5989 * If listener <code>l</code> is <code>null</code>, 5990 * no exception is thrown and no action is performed. 5991 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" 5992 * >AWT Threading Issues</a> for details on AWT's threading model. 5993 * 5994 * @param l the input method listener 5995 * @see java.awt.event.InputMethodEvent 5996 * @see java.awt.event.InputMethodListener 5997 * @see #addInputMethodListener 5998 * @see #getInputMethodListeners 5999 * @since 1.2 6000 */ 6001 public synchronized void removeInputMethodListener(InputMethodListener l) { 6002 if (l == null) { 6003 return; 6004 } 6005 inputMethodListener = AWTEventMulticaster.remove(inputMethodListener, l); 6006 } 6007 6008 /** 6009 * Returns an array of all the input method listeners 6010 * registered on this component. 6011 * 6012 * @return all of this component's <code>InputMethodListener</code>s 6013 * or an empty array if no input method 6014 * listeners are currently registered 6015 * 6016 * @see #addInputMethodListener 6017 * @see #removeInputMethodListener 6018 * @since 1.4 6019 */ 6020 public synchronized InputMethodListener[] getInputMethodListeners() { 6021 return getListeners(InputMethodListener.class); 6022 } 6023 6024 /** 6025 * Returns an array of all the objects currently registered 6026 * as <code><em>Foo</em>Listener</code>s 6027 * upon this <code>Component</code>. 6028 * <code><em>Foo</em>Listener</code>s are registered using the 6029 * <code>add<em>Foo</em>Listener</code> method. 6030 * 6031 * <p> 6032 * You can specify the <code>listenerType</code> argument 6033 * with a class literal, such as 6034 * <code><em>Foo</em>Listener.class</code>. 6035 * For example, you can query a 6036 * <code>Component</code> <code>c</code> 6037 * for its mouse listeners with the following code: 6038 * 6039 * <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre> 6040 * 6041 * If no such listeners exist, this method returns an empty array. 6042 * 6043 * @param <T> the type of the listeners 6044 * @param listenerType the type of listeners requested; this parameter 6045 * should specify an interface that descends from 6046 * <code>java.util.EventListener</code> 6047 * @return an array of all objects registered as 6048 * <code><em>Foo</em>Listener</code>s on this component, 6049 * or an empty array if no such listeners have been added 6050 * @exception ClassCastException if <code>listenerType</code> 6051 * doesn't specify a class or interface that implements 6052 * <code>java.util.EventListener</code> 6053 * @throws NullPointerException if {@code listenerType} is {@code null} 6054 * @see #getComponentListeners 6055 * @see #getFocusListeners 6056 * @see #getHierarchyListeners 6057 * @see #getHierarchyBoundsListeners 6058 * @see #getKeyListeners 6059 * @see #getMouseListeners 6060 * @see #getMouseMotionListeners 6061 * @see #getMouseWheelListeners 6062 * @see #getInputMethodListeners 6063 * @see #getPropertyChangeListeners 6064 * 6065 * @since 1.3 6066 */ 6067 @SuppressWarnings("unchecked") 6068 public <T extends EventListener> T[] getListeners(Class<T> listenerType) { 6069 EventListener l = null; 6070 if (listenerType == ComponentListener.class) { 6071 l = componentListener; 6072 } else if (listenerType == FocusListener.class) { 6073 l = focusListener; 6074 } else if (listenerType == HierarchyListener.class) { 6075 l = hierarchyListener; 6076 } else if (listenerType == HierarchyBoundsListener.class) { 6077 l = hierarchyBoundsListener; 6078 } else if (listenerType == KeyListener.class) { 6079 l = keyListener; 6080 } else if (listenerType == MouseListener.class) { 6081 l = mouseListener; 6082 } else if (listenerType == MouseMotionListener.class) { 6083 l = mouseMotionListener; 6084 } else if (listenerType == MouseWheelListener.class) { 6085 l = mouseWheelListener; 6086 } else if (listenerType == InputMethodListener.class) { 6087 l = inputMethodListener; 6088 } else if (listenerType == PropertyChangeListener.class) { 6089 return (T[])getPropertyChangeListeners(); 6090 } 6091 return AWTEventMulticaster.getListeners(l, listenerType); 6092 } 6093 6094 /** 6095 * Gets the input method request handler which supports 6096 * requests from input methods for this component. A component 6097 * that supports on-the-spot text input must override this 6098 * method to return an <code>InputMethodRequests</code> instance. 6099 * At the same time, it also has to handle input method events. 6100 * 6101 * @return the input method request handler for this component, 6102 * <code>null</code> by default 6103 * @see #addInputMethodListener 6104 * @since 1.2 6105 */ 6106 public InputMethodRequests getInputMethodRequests() { 6107 return null; 6108 } 6109 6110 /** 6111 * Gets the input context used by this component for handling 6112 * the communication with input methods when text is entered 6113 * in this component. By default, the input context used for 6114 * the parent component is returned. Components may 6115 * override this to return a private input context. 6116 * 6117 * @return the input context used by this component; 6118 * <code>null</code> if no context can be determined 6119 * @since 1.2 6120 */ 6121 public InputContext getInputContext() { 6122 Container parent = this.parent; 6123 if (parent == null) { 6124 return null; 6125 } else { 6126 return parent.getInputContext(); 6127 } 6128 } 6129 6130 /** 6131 * Enables the events defined by the specified event mask parameter 6132 * to be delivered to this component. 6133 * <p> 6134 * Event types are automatically enabled when a listener for 6135 * that event type is added to the component. 6136 * <p> 6137 * This method only needs to be invoked by subclasses of 6138 * <code>Component</code> which desire to have the specified event 6139 * types delivered to <code>processEvent</code> regardless of whether 6140 * or not a listener is registered. 6141 * @param eventsToEnable the event mask defining the event types 6142 * @see #processEvent 6143 * @see #disableEvents 6144 * @see AWTEvent 6145 * @since 1.1 6146 */ 6147 protected final void enableEvents(long eventsToEnable) { 6148 long notifyAncestors = 0; 6149 synchronized (this) { 6150 if ((eventsToEnable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 && 6151 hierarchyListener == null && 6152 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0) { 6153 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK; 6154 } 6155 if ((eventsToEnable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 && 6156 hierarchyBoundsListener == null && 6157 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0) { 6158 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK; 6159 } 6160 eventMask |= eventsToEnable; 6161 newEventsOnly = true; 6162 } 6163 6164 // if this is a lightweight component, enable mouse events 6165 // in the native container. 6166 if (peer instanceof LightweightPeer) { 6167 parent.proxyEnableEvents(eventMask); 6168 } 6169 if (notifyAncestors != 0) { 6170 synchronized (getTreeLock()) { 6171 adjustListeningChildrenOnParent(notifyAncestors, 1); 6172 } 6173 } 6174 } 6175 6176 /** 6177 * Disables the events defined by the specified event mask parameter 6178 * from being delivered to this component. 6179 * @param eventsToDisable the event mask defining the event types 6180 * @see #enableEvents 6181 * @since 1.1 6182 */ 6183 protected final void disableEvents(long eventsToDisable) { 6184 long notifyAncestors = 0; 6185 synchronized (this) { 6186 if ((eventsToDisable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 && 6187 hierarchyListener == null && 6188 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0) { 6189 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK; 6190 } 6191 if ((eventsToDisable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK)!=0 && 6192 hierarchyBoundsListener == null && 6193 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0) { 6194 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK; 6195 } 6196 eventMask &= ~eventsToDisable; 6197 } 6198 if (notifyAncestors != 0) { 6199 synchronized (getTreeLock()) { 6200 adjustListeningChildrenOnParent(notifyAncestors, -1); 6201 } 6202 } 6203 } 6204 6205 transient sun.awt.EventQueueItem[] eventCache; 6206 6207 /** 6208 * @see #isCoalescingEnabled 6209 * @see #checkCoalescing 6210 */ 6211 transient private boolean coalescingEnabled = checkCoalescing(); 6212 6213 /** 6214 * Weak map of known coalesceEvent overriders. 6215 * Value indicates whether overriden. 6216 * Bootstrap classes are not included. 6217 */ 6218 private static final Map<Class<?>, Boolean> coalesceMap = 6219 new java.util.WeakHashMap<Class<?>, Boolean>(); 6220 6221 /** 6222 * Indicates whether this class overrides coalesceEvents. 6223 * It is assumed that all classes that are loaded from the bootstrap 6224 * do not. 6225 * The bootstrap class loader is assumed to be represented by null. 6226 * We do not check that the method really overrides 6227 * (it might be static, private or package private). 6228 */ 6229 private boolean checkCoalescing() { 6230 if (getClass().getClassLoader()==null) { 6231 return false; 6232 } 6233 final Class<? extends Component> clazz = getClass(); 6234 synchronized (coalesceMap) { 6235 // Check cache. 6236 Boolean value = coalesceMap.get(clazz); 6237 if (value != null) { 6238 return value; 6239 } 6240 6241 // Need to check non-bootstraps. 6242 Boolean enabled = java.security.AccessController.doPrivileged( 6243 new java.security.PrivilegedAction<Boolean>() { 6244 public Boolean run() { 6245 return isCoalesceEventsOverriden(clazz); 6246 } 6247 } 6248 ); 6249 coalesceMap.put(clazz, enabled); 6250 return enabled; 6251 } 6252 } 6253 6254 /** 6255 * Parameter types of coalesceEvents(AWTEvent,AWTEVent). 6256 */ 6257 private static final Class<?>[] coalesceEventsParams = { 6258 AWTEvent.class, AWTEvent.class 6259 }; 6260 6261 /** 6262 * Indicates whether a class or its superclasses override coalesceEvents. 6263 * Must be called with lock on coalesceMap and privileged. 6264 * @see checkCoalescing 6265 */ 6266 private static boolean isCoalesceEventsOverriden(Class<?> clazz) { 6267 assert Thread.holdsLock(coalesceMap); 6268 6269 // First check superclass - we may not need to bother ourselves. 6270 Class<?> superclass = clazz.getSuperclass(); 6271 if (superclass == null) { 6272 // Only occurs on implementations that 6273 // do not use null to represent the bootstrap class loader. 6274 return false; 6275 } 6276 if (superclass.getClassLoader() != null) { 6277 Boolean value = coalesceMap.get(superclass); 6278 if (value == null) { 6279 // Not done already - recurse. 6280 if (isCoalesceEventsOverriden(superclass)) { 6281 coalesceMap.put(superclass, true); 6282 return true; 6283 } 6284 } else if (value) { 6285 return true; 6286 } 6287 } 6288 6289 try { 6290 // Throws if not overriden. 6291 clazz.getDeclaredMethod( 6292 "coalesceEvents", coalesceEventsParams 6293 ); 6294 return true; 6295 } catch (NoSuchMethodException e) { 6296 // Not present in this class. 6297 return false; 6298 } 6299 } 6300 6301 /** 6302 * Indicates whether coalesceEvents may do something. 6303 */ 6304 final boolean isCoalescingEnabled() { 6305 return coalescingEnabled; 6306 } 6307 6308 6309 /** 6310 * Potentially coalesce an event being posted with an existing 6311 * event. This method is called by <code>EventQueue.postEvent</code> 6312 * if an event with the same ID as the event to be posted is found in 6313 * the queue (both events must have this component as their source). 6314 * This method either returns a coalesced event which replaces 6315 * the existing event (and the new event is then discarded), or 6316 * <code>null</code> to indicate that no combining should be done 6317 * (add the second event to the end of the queue). Either event 6318 * parameter may be modified and returned, as the other one is discarded 6319 * unless <code>null</code> is returned. 6320 * <p> 6321 * This implementation of <code>coalesceEvents</code> coalesces 6322 * two event types: mouse move (and drag) events, 6323 * and paint (and update) events. 6324 * For mouse move events the last event is always returned, causing 6325 * intermediate moves to be discarded. For paint events, the new 6326 * event is coalesced into a complex <code>RepaintArea</code> in the peer. 6327 * The new <code>AWTEvent</code> is always returned. 6328 * 6329 * @param existingEvent the event already on the <code>EventQueue</code> 6330 * @param newEvent the event being posted to the 6331 * <code>EventQueue</code> 6332 * @return a coalesced event, or <code>null</code> indicating that no 6333 * coalescing was done 6334 */ 6335 protected AWTEvent coalesceEvents(AWTEvent existingEvent, 6336 AWTEvent newEvent) { 6337 return null; 6338 } 6339 6340 /** 6341 * Processes events occurring on this component. By default this 6342 * method calls the appropriate 6343 * <code>process<event type>Event</code> 6344 * method for the given class of event. 6345 * <p>Note that if the event parameter is <code>null</code> 6346 * the behavior is unspecified and may result in an 6347 * exception. 6348 * 6349 * @param e the event 6350 * @see #processComponentEvent 6351 * @see #processFocusEvent 6352 * @see #processKeyEvent 6353 * @see #processMouseEvent 6354 * @see #processMouseMotionEvent 6355 * @see #processInputMethodEvent 6356 * @see #processHierarchyEvent 6357 * @see #processMouseWheelEvent 6358 * @since 1.1 6359 */ 6360 protected void processEvent(AWTEvent e) { 6361 if (e instanceof FocusEvent) { 6362 processFocusEvent((FocusEvent)e); 6363 6364 } else if (e instanceof MouseEvent) { 6365 switch(e.getID()) { 6366 case MouseEvent.MOUSE_PRESSED: 6367 case MouseEvent.MOUSE_RELEASED: 6368 case MouseEvent.MOUSE_CLICKED: 6369 case MouseEvent.MOUSE_ENTERED: 6370 case MouseEvent.MOUSE_EXITED: 6371 processMouseEvent((MouseEvent)e); 6372 break; 6373 case MouseEvent.MOUSE_MOVED: 6374 case MouseEvent.MOUSE_DRAGGED: 6375 processMouseMotionEvent((MouseEvent)e); 6376 break; 6377 case MouseEvent.MOUSE_WHEEL: 6378 processMouseWheelEvent((MouseWheelEvent)e); 6379 break; 6380 } 6381 6382 } else if (e instanceof KeyEvent) { 6383 processKeyEvent((KeyEvent)e); 6384 6385 } else if (e instanceof ComponentEvent) { 6386 processComponentEvent((ComponentEvent)e); 6387 } else if (e instanceof InputMethodEvent) { 6388 processInputMethodEvent((InputMethodEvent)e); 6389 } else if (e instanceof HierarchyEvent) { 6390 switch (e.getID()) { 6391 case HierarchyEvent.HIERARCHY_CHANGED: 6392 processHierarchyEvent((HierarchyEvent)e); 6393 break; 6394 case HierarchyEvent.ANCESTOR_MOVED: 6395 case HierarchyEvent.ANCESTOR_RESIZED: 6396 processHierarchyBoundsEvent((HierarchyEvent)e); 6397 break; 6398 } 6399 } 6400 } 6401 6402 /** 6403 * Processes component events occurring on this component by 6404 * dispatching them to any registered 6405 * <code>ComponentListener</code> objects. 6406 * <p> 6407 * This method is not called unless component events are 6408 * enabled for this component. Component events are enabled 6409 * when one of the following occurs: 6410 * <ul> 6411 * <li>A <code>ComponentListener</code> object is registered 6412 * via <code>addComponentListener</code>. 6413 * <li>Component events are enabled via <code>enableEvents</code>. 6414 * </ul> 6415 * <p>Note that if the event parameter is <code>null</code> 6416 * the behavior is unspecified and may result in an 6417 * exception. 6418 * 6419 * @param e the component event 6420 * @see java.awt.event.ComponentEvent 6421 * @see java.awt.event.ComponentListener 6422 * @see #addComponentListener 6423 * @see #enableEvents 6424 * @since 1.1 6425 */ 6426 protected void processComponentEvent(ComponentEvent e) { 6427 ComponentListener listener = componentListener; 6428 if (listener != null) { 6429 int id = e.getID(); 6430 switch(id) { 6431 case ComponentEvent.COMPONENT_RESIZED: 6432 listener.componentResized(e); 6433 break; 6434 case ComponentEvent.COMPONENT_MOVED: 6435 listener.componentMoved(e); 6436 break; 6437 case ComponentEvent.COMPONENT_SHOWN: 6438 listener.componentShown(e); 6439 break; 6440 case ComponentEvent.COMPONENT_HIDDEN: 6441 listener.componentHidden(e); 6442 break; 6443 } 6444 } 6445 } 6446 6447 /** 6448 * Processes focus events occurring on this component by 6449 * dispatching them to any registered 6450 * <code>FocusListener</code> objects. 6451 * <p> 6452 * This method is not called unless focus events are 6453 * enabled for this component. Focus events are enabled 6454 * when one of the following occurs: 6455 * <ul> 6456 * <li>A <code>FocusListener</code> object is registered 6457 * via <code>addFocusListener</code>. 6458 * <li>Focus events are enabled via <code>enableEvents</code>. 6459 * </ul> 6460 * <p> 6461 * If focus events are enabled for a <code>Component</code>, 6462 * the current <code>KeyboardFocusManager</code> determines 6463 * whether or not a focus event should be dispatched to 6464 * registered <code>FocusListener</code> objects. If the 6465 * events are to be dispatched, the <code>KeyboardFocusManager</code> 6466 * calls the <code>Component</code>'s <code>dispatchEvent</code> 6467 * method, which results in a call to the <code>Component</code>'s 6468 * <code>processFocusEvent</code> method. 6469 * <p> 6470 * If focus events are enabled for a <code>Component</code>, calling 6471 * the <code>Component</code>'s <code>dispatchEvent</code> method 6472 * with a <code>FocusEvent</code> as the argument will result in a 6473 * call to the <code>Component</code>'s <code>processFocusEvent</code> 6474 * method regardless of the current <code>KeyboardFocusManager</code>. 6475 * 6476 * <p>Note that if the event parameter is <code>null</code> 6477 * the behavior is unspecified and may result in an 6478 * exception. 6479 * 6480 * @param e the focus event 6481 * @see java.awt.event.FocusEvent 6482 * @see java.awt.event.FocusListener 6483 * @see java.awt.KeyboardFocusManager 6484 * @see #addFocusListener 6485 * @see #enableEvents 6486 * @see #dispatchEvent 6487 * @since 1.1 6488 */ 6489 protected void processFocusEvent(FocusEvent e) { 6490 FocusListener listener = focusListener; 6491 if (listener != null) { 6492 int id = e.getID(); 6493 switch(id) { 6494 case FocusEvent.FOCUS_GAINED: 6495 listener.focusGained(e); 6496 break; 6497 case FocusEvent.FOCUS_LOST: 6498 listener.focusLost(e); 6499 break; 6500 } 6501 } 6502 } 6503 6504 /** 6505 * Processes key events occurring on this component by 6506 * dispatching them to any registered 6507 * <code>KeyListener</code> objects. 6508 * <p> 6509 * This method is not called unless key events are 6510 * enabled for this component. Key events are enabled 6511 * when one of the following occurs: 6512 * <ul> 6513 * <li>A <code>KeyListener</code> object is registered 6514 * via <code>addKeyListener</code>. 6515 * <li>Key events are enabled via <code>enableEvents</code>. 6516 * </ul> 6517 * 6518 * <p> 6519 * If key events are enabled for a <code>Component</code>, 6520 * the current <code>KeyboardFocusManager</code> determines 6521 * whether or not a key event should be dispatched to 6522 * registered <code>KeyListener</code> objects. The 6523 * <code>DefaultKeyboardFocusManager</code> will not dispatch 6524 * key events to a <code>Component</code> that is not the focus 6525 * owner or is not showing. 6526 * <p> 6527 * As of J2SE 1.4, <code>KeyEvent</code>s are redirected to 6528 * the focus owner. Please see the 6529 * <a href="doc-files/FocusSpec.html">Focus Specification</a> 6530 * for further information. 6531 * <p> 6532 * Calling a <code>Component</code>'s <code>dispatchEvent</code> 6533 * method with a <code>KeyEvent</code> as the argument will 6534 * result in a call to the <code>Component</code>'s 6535 * <code>processKeyEvent</code> method regardless of the 6536 * current <code>KeyboardFocusManager</code> as long as the 6537 * component is showing, focused, and enabled, and key events 6538 * are enabled on it. 6539 * <p>If the event parameter is <code>null</code> 6540 * the behavior is unspecified and may result in an 6541 * exception. 6542 * 6543 * @param e the key event 6544 * @see java.awt.event.KeyEvent 6545 * @see java.awt.event.KeyListener 6546 * @see java.awt.KeyboardFocusManager 6547 * @see java.awt.DefaultKeyboardFocusManager 6548 * @see #processEvent 6549 * @see #dispatchEvent 6550 * @see #addKeyListener 6551 * @see #enableEvents 6552 * @see #isShowing 6553 * @since 1.1 6554 */ 6555 protected void processKeyEvent(KeyEvent e) { 6556 KeyListener listener = keyListener; 6557 if (listener != null) { 6558 int id = e.getID(); 6559 switch(id) { 6560 case KeyEvent.KEY_TYPED: 6561 listener.keyTyped(e); 6562 break; 6563 case KeyEvent.KEY_PRESSED: 6564 listener.keyPressed(e); 6565 break; 6566 case KeyEvent.KEY_RELEASED: 6567 listener.keyReleased(e); 6568 break; 6569 } 6570 } 6571 } 6572 6573 /** 6574 * Processes mouse events occurring on this component by 6575 * dispatching them to any registered 6576 * <code>MouseListener</code> objects. 6577 * <p> 6578 * This method is not called unless mouse events are 6579 * enabled for this component. Mouse events are enabled 6580 * when one of the following occurs: 6581 * <ul> 6582 * <li>A <code>MouseListener</code> object is registered 6583 * via <code>addMouseListener</code>. 6584 * <li>Mouse events are enabled via <code>enableEvents</code>. 6585 * </ul> 6586 * <p>Note that if the event parameter is <code>null</code> 6587 * the behavior is unspecified and may result in an 6588 * exception. 6589 * 6590 * @param e the mouse event 6591 * @see java.awt.event.MouseEvent 6592 * @see java.awt.event.MouseListener 6593 * @see #addMouseListener 6594 * @see #enableEvents 6595 * @since 1.1 6596 */ 6597 protected void processMouseEvent(MouseEvent e) { 6598 MouseListener listener = mouseListener; 6599 if (listener != null) { 6600 int id = e.getID(); 6601 switch(id) { 6602 case MouseEvent.MOUSE_PRESSED: 6603 listener.mousePressed(e); 6604 break; 6605 case MouseEvent.MOUSE_RELEASED: 6606 listener.mouseReleased(e); 6607 break; 6608 case MouseEvent.MOUSE_CLICKED: 6609 listener.mouseClicked(e); 6610 break; 6611 case MouseEvent.MOUSE_EXITED: 6612 listener.mouseExited(e); 6613 break; 6614 case MouseEvent.MOUSE_ENTERED: 6615 listener.mouseEntered(e); 6616 break; 6617 } 6618 } 6619 } 6620 6621 /** 6622 * Processes mouse motion events occurring on this component by 6623 * dispatching them to any registered 6624 * <code>MouseMotionListener</code> objects. 6625 * <p> 6626 * This method is not called unless mouse motion events are 6627 * enabled for this component. Mouse motion events are enabled 6628 * when one of the following occurs: 6629 * <ul> 6630 * <li>A <code>MouseMotionListener</code> object is registered 6631 * via <code>addMouseMotionListener</code>. 6632 * <li>Mouse motion events are enabled via <code>enableEvents</code>. 6633 * </ul> 6634 * <p>Note that if the event parameter is <code>null</code> 6635 * the behavior is unspecified and may result in an 6636 * exception. 6637 * 6638 * @param e the mouse motion event 6639 * @see java.awt.event.MouseEvent 6640 * @see java.awt.event.MouseMotionListener 6641 * @see #addMouseMotionListener 6642 * @see #enableEvents 6643 * @since 1.1 6644 */ 6645 protected void processMouseMotionEvent(MouseEvent e) { 6646 MouseMotionListener listener = mouseMotionListener; 6647 if (listener != null) { 6648 int id = e.getID(); 6649 switch(id) { 6650 case MouseEvent.MOUSE_MOVED: 6651 listener.mouseMoved(e); 6652 break; 6653 case MouseEvent.MOUSE_DRAGGED: 6654 listener.mouseDragged(e); 6655 break; 6656 } 6657 } 6658 } 6659 6660 /** 6661 * Processes mouse wheel events occurring on this component by 6662 * dispatching them to any registered 6663 * <code>MouseWheelListener</code> objects. 6664 * <p> 6665 * This method is not called unless mouse wheel events are 6666 * enabled for this component. Mouse wheel events are enabled 6667 * when one of the following occurs: 6668 * <ul> 6669 * <li>A <code>MouseWheelListener</code> object is registered 6670 * via <code>addMouseWheelListener</code>. 6671 * <li>Mouse wheel events are enabled via <code>enableEvents</code>. 6672 * </ul> 6673 * <p> 6674 * For information on how mouse wheel events are dispatched, see 6675 * the class description for {@link MouseWheelEvent}. 6676 * <p> 6677 * Note that if the event parameter is <code>null</code> 6678 * the behavior is unspecified and may result in an 6679 * exception. 6680 * 6681 * @param e the mouse wheel event 6682 * @see java.awt.event.MouseWheelEvent 6683 * @see java.awt.event.MouseWheelListener 6684 * @see #addMouseWheelListener 6685 * @see #enableEvents 6686 * @since 1.4 6687 */ 6688 protected void processMouseWheelEvent(MouseWheelEvent e) { 6689 MouseWheelListener listener = mouseWheelListener; 6690 if (listener != null) { 6691 int id = e.getID(); 6692 switch(id) { 6693 case MouseEvent.MOUSE_WHEEL: 6694 listener.mouseWheelMoved(e); 6695 break; 6696 } 6697 } 6698 } 6699 6700 boolean postsOldMouseEvents() { 6701 return false; 6702 } 6703 6704 /** 6705 * Processes input method events occurring on this component by 6706 * dispatching them to any registered 6707 * <code>InputMethodListener</code> objects. 6708 * <p> 6709 * This method is not called unless input method events 6710 * are enabled for this component. Input method events are enabled 6711 * when one of the following occurs: 6712 * <ul> 6713 * <li>An <code>InputMethodListener</code> object is registered 6714 * via <code>addInputMethodListener</code>. 6715 * <li>Input method events are enabled via <code>enableEvents</code>. 6716 * </ul> 6717 * <p>Note that if the event parameter is <code>null</code> 6718 * the behavior is unspecified and may result in an 6719 * exception. 6720 * 6721 * @param e the input method event 6722 * @see java.awt.event.InputMethodEvent 6723 * @see java.awt.event.InputMethodListener 6724 * @see #addInputMethodListener 6725 * @see #enableEvents 6726 * @since 1.2 6727 */ 6728 protected void processInputMethodEvent(InputMethodEvent e) { 6729 InputMethodListener listener = inputMethodListener; 6730 if (listener != null) { 6731 int id = e.getID(); 6732 switch (id) { 6733 case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED: 6734 listener.inputMethodTextChanged(e); 6735 break; 6736 case InputMethodEvent.CARET_POSITION_CHANGED: 6737 listener.caretPositionChanged(e); 6738 break; 6739 } 6740 } 6741 } 6742 6743 /** 6744 * Processes hierarchy events occurring on this component by 6745 * dispatching them to any registered 6746 * <code>HierarchyListener</code> objects. 6747 * <p> 6748 * This method is not called unless hierarchy events 6749 * are enabled for this component. Hierarchy events are enabled 6750 * when one of the following occurs: 6751 * <ul> 6752 * <li>An <code>HierarchyListener</code> object is registered 6753 * via <code>addHierarchyListener</code>. 6754 * <li>Hierarchy events are enabled via <code>enableEvents</code>. 6755 * </ul> 6756 * <p>Note that if the event parameter is <code>null</code> 6757 * the behavior is unspecified and may result in an 6758 * exception. 6759 * 6760 * @param e the hierarchy event 6761 * @see java.awt.event.HierarchyEvent 6762 * @see java.awt.event.HierarchyListener 6763 * @see #addHierarchyListener 6764 * @see #enableEvents 6765 * @since 1.3 6766 */ 6767 protected void processHierarchyEvent(HierarchyEvent e) { 6768 HierarchyListener listener = hierarchyListener; 6769 if (listener != null) { 6770 int id = e.getID(); 6771 switch (id) { 6772 case HierarchyEvent.HIERARCHY_CHANGED: 6773 listener.hierarchyChanged(e); 6774 break; 6775 } 6776 } 6777 } 6778 6779 /** 6780 * Processes hierarchy bounds events occurring on this component by 6781 * dispatching them to any registered 6782 * <code>HierarchyBoundsListener</code> objects. 6783 * <p> 6784 * This method is not called unless hierarchy bounds events 6785 * are enabled for this component. Hierarchy bounds events are enabled 6786 * when one of the following occurs: 6787 * <ul> 6788 * <li>An <code>HierarchyBoundsListener</code> object is registered 6789 * via <code>addHierarchyBoundsListener</code>. 6790 * <li>Hierarchy bounds events are enabled via <code>enableEvents</code>. 6791 * </ul> 6792 * <p>Note that if the event parameter is <code>null</code> 6793 * the behavior is unspecified and may result in an 6794 * exception. 6795 * 6796 * @param e the hierarchy event 6797 * @see java.awt.event.HierarchyEvent 6798 * @see java.awt.event.HierarchyBoundsListener 6799 * @see #addHierarchyBoundsListener 6800 * @see #enableEvents 6801 * @since 1.3 6802 */ 6803 protected void processHierarchyBoundsEvent(HierarchyEvent e) { 6804 HierarchyBoundsListener listener = hierarchyBoundsListener; 6805 if (listener != null) { 6806 int id = e.getID(); 6807 switch (id) { 6808 case HierarchyEvent.ANCESTOR_MOVED: 6809 listener.ancestorMoved(e); 6810 break; 6811 case HierarchyEvent.ANCESTOR_RESIZED: 6812 listener.ancestorResized(e); 6813 break; 6814 } 6815 } 6816 } 6817 6818 /** 6819 * @param evt the event to handle 6820 * @return {@code true} if the event was handled, {@code false} otherwise 6821 * @deprecated As of JDK version 1.1 6822 * replaced by processEvent(AWTEvent). 6823 */ 6824 @Deprecated 6825 public boolean handleEvent(Event evt) { 6826 switch (evt.id) { 6827 case Event.MOUSE_ENTER: 6828 return mouseEnter(evt, evt.x, evt.y); 6829 6830 case Event.MOUSE_EXIT: 6831 return mouseExit(evt, evt.x, evt.y); 6832 6833 case Event.MOUSE_MOVE: 6834 return mouseMove(evt, evt.x, evt.y); 6835 6836 case Event.MOUSE_DOWN: 6837 return mouseDown(evt, evt.x, evt.y); 6838 6839 case Event.MOUSE_DRAG: 6840 return mouseDrag(evt, evt.x, evt.y); 6841 6842 case Event.MOUSE_UP: 6843 return mouseUp(evt, evt.x, evt.y); 6844 6845 case Event.KEY_PRESS: 6846 case Event.KEY_ACTION: 6847 return keyDown(evt, evt.key); 6848 6849 case Event.KEY_RELEASE: 6850 case Event.KEY_ACTION_RELEASE: 6851 return keyUp(evt, evt.key); 6852 6853 case Event.ACTION_EVENT: 6854 return action(evt, evt.arg); 6855 case Event.GOT_FOCUS: 6856 return gotFocus(evt, evt.arg); 6857 case Event.LOST_FOCUS: 6858 return lostFocus(evt, evt.arg); 6859 } 6860 return false; 6861 } 6862 6863 /** 6864 * @param evt the event to handle 6865 * @param x the x coordinate 6866 * @param y the y coordinate 6867 * @return {@code false} 6868 * @deprecated As of JDK version 1.1, 6869 * replaced by processMouseEvent(MouseEvent). 6870 */ 6871 @Deprecated 6872 public boolean mouseDown(Event evt, int x, int y) { 6873 return false; 6874 } 6875 6876 /** 6877 * @param evt the event to handle 6878 * @param x the x coordinate 6879 * @param y the y coordinate 6880 * @return {@code false} 6881 * @deprecated As of JDK version 1.1, 6882 * replaced by processMouseMotionEvent(MouseEvent). 6883 */ 6884 @Deprecated 6885 public boolean mouseDrag(Event evt, int x, int y) { 6886 return false; 6887 } 6888 6889 /** 6890 * @param evt the event to handle 6891 * @param x the x coordinate 6892 * @param y the y coordinate 6893 * @return {@code false} 6894 * @deprecated As of JDK version 1.1, 6895 * replaced by processMouseEvent(MouseEvent). 6896 */ 6897 @Deprecated 6898 public boolean mouseUp(Event evt, int x, int y) { 6899 return false; 6900 } 6901 6902 /** 6903 * @param evt the event to handle 6904 * @param x the x coordinate 6905 * @param y the y coordinate 6906 * @return {@code false} 6907 * @deprecated As of JDK version 1.1, 6908 * replaced by processMouseMotionEvent(MouseEvent). 6909 */ 6910 @Deprecated 6911 public boolean mouseMove(Event evt, int x, int y) { 6912 return false; 6913 } 6914 6915 /** 6916 * @param evt the event to handle 6917 * @param x the x coordinate 6918 * @param y the y coordinate 6919 * @return {@code false} 6920 * @deprecated As of JDK version 1.1, 6921 * replaced by processMouseEvent(MouseEvent). 6922 */ 6923 @Deprecated 6924 public boolean mouseEnter(Event evt, int x, int y) { 6925 return false; 6926 } 6927 6928 /** 6929 * @param evt the event to handle 6930 * @param x the x coordinate 6931 * @param y the y coordinate 6932 * @return {@code false} 6933 * @deprecated As of JDK version 1.1, 6934 * replaced by processMouseEvent(MouseEvent). 6935 */ 6936 @Deprecated 6937 public boolean mouseExit(Event evt, int x, int y) { 6938 return false; 6939 } 6940 6941 /** 6942 * @param evt the event to handle 6943 * @param key the key pressed 6944 * @return {@code false} 6945 * @deprecated As of JDK version 1.1, 6946 * replaced by processKeyEvent(KeyEvent). 6947 */ 6948 @Deprecated 6949 public boolean keyDown(Event evt, int key) { 6950 return false; 6951 } 6952 6953 /** 6954 * @param evt the event to handle 6955 * @param key the key pressed 6956 * @return {@code false} 6957 * @deprecated As of JDK version 1.1, 6958 * replaced by processKeyEvent(KeyEvent). 6959 */ 6960 @Deprecated 6961 public boolean keyUp(Event evt, int key) { 6962 return false; 6963 } 6964 6965 /** 6966 * @param evt the event to handle 6967 * @param what the object acted on 6968 * @return {@code false} 6969 * @deprecated As of JDK version 1.1, 6970 * should register this component as ActionListener on component 6971 * which fires action events. 6972 */ 6973 @Deprecated 6974 public boolean action(Event evt, Object what) { 6975 return false; 6976 } 6977 6978 /** 6979 * Makes this <code>Component</code> displayable by connecting it to a 6980 * native screen resource. 6981 * This method is called internally by the toolkit and should 6982 * not be called directly by programs. 6983 * <p> 6984 * This method changes layout-related information, and therefore, 6985 * invalidates the component hierarchy. 6986 * 6987 * @see #isDisplayable 6988 * @see #removeNotify 6989 * @see #invalidate 6990 * @since 1.0 6991 */ 6992 public void addNotify() { 6993 synchronized (getTreeLock()) { 6994 ComponentPeer peer = this.peer; 6995 if (peer == null || peer instanceof LightweightPeer){ 6996 if (peer == null) { 6997 // Update both the Component's peer variable and the local 6998 // variable we use for thread safety. 6999 this.peer = peer = getComponentFactory().createComponent(this); 7000 } 7001 7002 // This is a lightweight component which means it won't be 7003 // able to get window-related events by itself. If any 7004 // have been enabled, then the nearest native container must 7005 // be enabled. 7006 if (parent != null) { 7007 long mask = 0; 7008 if ((mouseListener != null) || ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0)) { 7009 mask |= AWTEvent.MOUSE_EVENT_MASK; 7010 } 7011 if ((mouseMotionListener != null) || 7012 ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0)) { 7013 mask |= AWTEvent.MOUSE_MOTION_EVENT_MASK; 7014 } 7015 if ((mouseWheelListener != null ) || 7016 ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0)) { 7017 mask |= AWTEvent.MOUSE_WHEEL_EVENT_MASK; 7018 } 7019 if (focusListener != null || (eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0) { 7020 mask |= AWTEvent.FOCUS_EVENT_MASK; 7021 } 7022 if (keyListener != null || (eventMask & AWTEvent.KEY_EVENT_MASK) != 0) { 7023 mask |= AWTEvent.KEY_EVENT_MASK; 7024 } 7025 if (mask != 0) { 7026 parent.proxyEnableEvents(mask); 7027 } 7028 } 7029 } else { 7030 // It's native. If the parent is lightweight it will need some 7031 // help. 7032 Container parent = getContainer(); 7033 if (parent != null && parent.isLightweight()) { 7034 relocateComponent(); 7035 if (!parent.isRecursivelyVisibleUpToHeavyweightContainer()) 7036 { 7037 peer.setVisible(false); 7038 } 7039 } 7040 } 7041 invalidate(); 7042 7043 int npopups = (popups != null? popups.size() : 0); 7044 for (int i = 0 ; i < npopups ; i++) { 7045 PopupMenu popup = popups.elementAt(i); 7046 popup.addNotify(); 7047 } 7048 7049 if (dropTarget != null) dropTarget.addNotify(); 7050 7051 peerFont = getFont(); 7052 7053 if (getContainer() != null && !isAddNotifyComplete) { 7054 getContainer().increaseComponentCount(this); 7055 } 7056 7057 7058 // Update stacking order 7059 updateZOrder(); 7060 7061 if (!isAddNotifyComplete) { 7062 mixOnShowing(); 7063 } 7064 7065 isAddNotifyComplete = true; 7066 7067 if (hierarchyListener != null || 7068 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 || 7069 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) { 7070 HierarchyEvent e = 7071 new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED, 7072 this, parent, 7073 HierarchyEvent.DISPLAYABILITY_CHANGED | 7074 ((isRecursivelyVisible()) 7075 ? HierarchyEvent.SHOWING_CHANGED 7076 : 0)); 7077 dispatchEvent(e); 7078 } 7079 } 7080 } 7081 7082 /** 7083 * Makes this <code>Component</code> undisplayable by destroying it native 7084 * screen resource. 7085 * <p> 7086 * This method is called by the toolkit internally and should 7087 * not be called directly by programs. Code overriding 7088 * this method should call <code>super.removeNotify</code> as 7089 * the first line of the overriding method. 7090 * 7091 * @see #isDisplayable 7092 * @see #addNotify 7093 * @since 1.0 7094 */ 7095 public void removeNotify() { 7096 KeyboardFocusManager.clearMostRecentFocusOwner(this); 7097 if (KeyboardFocusManager.getCurrentKeyboardFocusManager(). 7098 getPermanentFocusOwner() == this) 7099 { 7100 KeyboardFocusManager.getCurrentKeyboardFocusManager(). 7101 setGlobalPermanentFocusOwner(null); 7102 } 7103 7104 synchronized (getTreeLock()) { 7105 if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabledFor(this)) { 7106 transferFocus(true); 7107 } 7108 7109 if (getContainer() != null && isAddNotifyComplete) { 7110 getContainer().decreaseComponentCount(this); 7111 } 7112 7113 int npopups = (popups != null? popups.size() : 0); 7114 for (int i = 0 ; i < npopups ; i++) { 7115 PopupMenu popup = popups.elementAt(i); 7116 popup.removeNotify(); 7117 } 7118 // If there is any input context for this component, notify 7119 // that this component is being removed. (This has to be done 7120 // before hiding peer.) 7121 if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) { 7122 InputContext inputContext = getInputContext(); 7123 if (inputContext != null) { 7124 inputContext.removeNotify(this); 7125 } 7126 } 7127 7128 ComponentPeer p = peer; 7129 if (p != null) { 7130 boolean isLightweight = isLightweight(); 7131 7132 if (bufferStrategy instanceof FlipBufferStrategy) { 7133 ((FlipBufferStrategy)bufferStrategy).destroyBuffers(); 7134 } 7135 7136 if (dropTarget != null) dropTarget.removeNotify(); 7137 7138 // Hide peer first to stop system events such as cursor moves. 7139 if (visible) { 7140 p.setVisible(false); 7141 } 7142 7143 peer = null; // Stop peer updates. 7144 peerFont = null; 7145 7146 Toolkit.getEventQueue().removeSourceEvents(this, false); 7147 KeyboardFocusManager.getCurrentKeyboardFocusManager(). 7148 discardKeyEvents(this); 7149 7150 p.dispose(); 7151 7152 mixOnHiding(isLightweight); 7153 7154 isAddNotifyComplete = false; 7155 // Nullifying compoundShape means that the component has normal shape 7156 // (or has no shape at all). 7157 this.compoundShape = null; 7158 } 7159 7160 if (hierarchyListener != null || 7161 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 || 7162 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) { 7163 HierarchyEvent e = 7164 new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED, 7165 this, parent, 7166 HierarchyEvent.DISPLAYABILITY_CHANGED | 7167 ((isRecursivelyVisible()) 7168 ? HierarchyEvent.SHOWING_CHANGED 7169 : 0)); 7170 dispatchEvent(e); 7171 } 7172 } 7173 } 7174 7175 /** 7176 * @param evt the event to handle 7177 * @param what the object focused 7178 * @return {@code false} 7179 * @deprecated As of JDK version 1.1, 7180 * replaced by processFocusEvent(FocusEvent). 7181 */ 7182 @Deprecated 7183 public boolean gotFocus(Event evt, Object what) { 7184 return false; 7185 } 7186 7187 /** 7188 * @param evt the event to handle 7189 * @param what the object focused 7190 * @return {@code false} 7191 * @deprecated As of JDK version 1.1, 7192 * replaced by processFocusEvent(FocusEvent). 7193 */ 7194 @Deprecated 7195 public boolean lostFocus(Event evt, Object what) { 7196 return false; 7197 } 7198 7199 /** 7200 * Returns whether this <code>Component</code> can become the focus 7201 * owner. 7202 * 7203 * @return <code>true</code> if this <code>Component</code> is 7204 * focusable; <code>false</code> otherwise 7205 * @see #setFocusable 7206 * @since 1.1 7207 * @deprecated As of 1.4, replaced by <code>isFocusable()</code>. 7208 */ 7209 @Deprecated 7210 public boolean isFocusTraversable() { 7211 if (isFocusTraversableOverridden == FOCUS_TRAVERSABLE_UNKNOWN) { 7212 isFocusTraversableOverridden = FOCUS_TRAVERSABLE_DEFAULT; 7213 } 7214 return focusable; 7215 } 7216 7217 /** 7218 * Returns whether this Component can be focused. 7219 * 7220 * @return <code>true</code> if this Component is focusable; 7221 * <code>false</code> otherwise. 7222 * @see #setFocusable 7223 * @since 1.4 7224 */ 7225 public boolean isFocusable() { 7226 return isFocusTraversable(); 7227 } 7228 7229 /** 7230 * Sets the focusable state of this Component to the specified value. This 7231 * value overrides the Component's default focusability. 7232 * 7233 * @param focusable indicates whether this Component is focusable 7234 * @see #isFocusable 7235 * @since 1.4 7236 * @beaninfo 7237 * bound: true 7238 */ 7239 public void setFocusable(boolean focusable) { 7240 boolean oldFocusable; 7241 synchronized (this) { 7242 oldFocusable = this.focusable; 7243 this.focusable = focusable; 7244 } 7245 isFocusTraversableOverridden = FOCUS_TRAVERSABLE_SET; 7246 7247 firePropertyChange("focusable", oldFocusable, focusable); 7248 if (oldFocusable && !focusable) { 7249 if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabled()) { 7250 transferFocus(true); 7251 } 7252 KeyboardFocusManager.clearMostRecentFocusOwner(this); 7253 } 7254 } 7255 7256 final boolean isFocusTraversableOverridden() { 7257 return (isFocusTraversableOverridden != FOCUS_TRAVERSABLE_DEFAULT); 7258 } 7259 7260 /** 7261 * Sets the focus traversal keys for a given traversal operation for this 7262 * Component. 7263 * <p> 7264 * The default values for a Component's focus traversal keys are 7265 * implementation-dependent. Sun recommends that all implementations for a 7266 * particular native platform use the same default values. The 7267 * recommendations for Windows and Unix are listed below. These 7268 * recommendations are used in the Sun AWT implementations. 7269 * 7270 * <table border=1 summary="Recommended default values for a Component's focus traversal keys"> 7271 * <tr> 7272 * <th>Identifier</th> 7273 * <th>Meaning</th> 7274 * <th>Default</th> 7275 * </tr> 7276 * <tr> 7277 * <td>KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS</td> 7278 * <td>Normal forward keyboard traversal</td> 7279 * <td>TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED</td> 7280 * </tr> 7281 * <tr> 7282 * <td>KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS</td> 7283 * <td>Normal reverse keyboard traversal</td> 7284 * <td>SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED</td> 7285 * </tr> 7286 * <tr> 7287 * <td>KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS</td> 7288 * <td>Go up one focus traversal cycle</td> 7289 * <td>none</td> 7290 * </tr> 7291 * </table> 7292 * 7293 * To disable a traversal key, use an empty Set; Collections.EMPTY_SET is 7294 * recommended. 7295 * <p> 7296 * Using the AWTKeyStroke API, client code can specify on which of two 7297 * specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal 7298 * operation will occur. Regardless of which KeyEvent is specified, 7299 * however, all KeyEvents related to the focus traversal key, including the 7300 * associated KEY_TYPED event, will be consumed, and will not be dispatched 7301 * to any Component. It is a runtime error to specify a KEY_TYPED event as 7302 * mapping to a focus traversal operation, or to map the same event to 7303 * multiple default focus traversal operations. 7304 * <p> 7305 * If a value of null is specified for the Set, this Component inherits the 7306 * Set from its parent. If all ancestors of this Component have null 7307 * specified for the Set, then the current KeyboardFocusManager's default 7308 * Set is used. 7309 * <p> 7310 * This method may throw a {@code ClassCastException} if any {@code Object} 7311 * in {@code keystrokes} is not an {@code AWTKeyStroke}. 7312 * 7313 * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7314 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7315 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS 7316 * @param keystrokes the Set of AWTKeyStroke for the specified operation 7317 * @see #getFocusTraversalKeys 7318 * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS 7319 * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS 7320 * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS 7321 * @throws IllegalArgumentException if id is not one of 7322 * KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7323 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7324 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes 7325 * contains null, or if any keystroke represents a KEY_TYPED event, 7326 * or if any keystroke already maps to another focus traversal 7327 * operation for this Component 7328 * @since 1.4 7329 * @beaninfo 7330 * bound: true 7331 */ 7332 public void setFocusTraversalKeys(int id, 7333 Set<? extends AWTKeyStroke> keystrokes) 7334 { 7335 if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) { 7336 throw new IllegalArgumentException("invalid focus traversal key identifier"); 7337 } 7338 7339 setFocusTraversalKeys_NoIDCheck(id, keystrokes); 7340 } 7341 7342 /** 7343 * Returns the Set of focus traversal keys for a given traversal operation 7344 * for this Component. (See 7345 * <code>setFocusTraversalKeys</code> for a full description of each key.) 7346 * <p> 7347 * If a Set of traversal keys has not been explicitly defined for this 7348 * Component, then this Component's parent's Set is returned. If no Set 7349 * has been explicitly defined for any of this Component's ancestors, then 7350 * the current KeyboardFocusManager's default Set is returned. 7351 * 7352 * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7353 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7354 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS 7355 * @return the Set of AWTKeyStrokes for the specified operation. The Set 7356 * will be unmodifiable, and may be empty. null will never be 7357 * returned. 7358 * @see #setFocusTraversalKeys 7359 * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS 7360 * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS 7361 * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS 7362 * @throws IllegalArgumentException if id is not one of 7363 * KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7364 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7365 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS 7366 * @since 1.4 7367 */ 7368 public Set<AWTKeyStroke> getFocusTraversalKeys(int id) { 7369 if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) { 7370 throw new IllegalArgumentException("invalid focus traversal key identifier"); 7371 } 7372 7373 return getFocusTraversalKeys_NoIDCheck(id); 7374 } 7375 7376 // We define these methods so that Container does not need to repeat this 7377 // code. Container cannot call super.<method> because Container allows 7378 // DOWN_CYCLE_TRAVERSAL_KEY while Component does not. The Component method 7379 // would erroneously generate an IllegalArgumentException for 7380 // DOWN_CYCLE_TRAVERSAL_KEY. 7381 final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes) { 7382 Set<AWTKeyStroke> oldKeys; 7383 7384 synchronized (this) { 7385 if (focusTraversalKeys == null) { 7386 initializeFocusTraversalKeys(); 7387 } 7388 7389 if (keystrokes != null) { 7390 for (AWTKeyStroke keystroke : keystrokes ) { 7391 7392 if (keystroke == null) { 7393 throw new IllegalArgumentException("cannot set null focus traversal key"); 7394 } 7395 7396 if (keystroke.getKeyChar() != KeyEvent.CHAR_UNDEFINED) { 7397 throw new IllegalArgumentException("focus traversal keys cannot map to KEY_TYPED events"); 7398 } 7399 7400 for (int i = 0; i < focusTraversalKeys.length; i++) { 7401 if (i == id) { 7402 continue; 7403 } 7404 7405 if (getFocusTraversalKeys_NoIDCheck(i).contains(keystroke)) 7406 { 7407 throw new IllegalArgumentException("focus traversal keys must be unique for a Component"); 7408 } 7409 } 7410 } 7411 } 7412 7413 oldKeys = focusTraversalKeys[id]; 7414 focusTraversalKeys[id] = (keystrokes != null) 7415 ? Collections.unmodifiableSet(new HashSet<AWTKeyStroke>(keystrokes)) 7416 : null; 7417 } 7418 7419 firePropertyChange(focusTraversalKeyPropertyNames[id], oldKeys, 7420 keystrokes); 7421 } 7422 final Set<AWTKeyStroke> getFocusTraversalKeys_NoIDCheck(int id) { 7423 // Okay to return Set directly because it is an unmodifiable view 7424 @SuppressWarnings("unchecked") 7425 Set<AWTKeyStroke> keystrokes = (focusTraversalKeys != null) 7426 ? focusTraversalKeys[id] 7427 : null; 7428 7429 if (keystrokes != null) { 7430 return keystrokes; 7431 } else { 7432 Container parent = this.parent; 7433 if (parent != null) { 7434 return parent.getFocusTraversalKeys(id); 7435 } else { 7436 return KeyboardFocusManager.getCurrentKeyboardFocusManager(). 7437 getDefaultFocusTraversalKeys(id); 7438 } 7439 } 7440 } 7441 7442 /** 7443 * Returns whether the Set of focus traversal keys for the given focus 7444 * traversal operation has been explicitly defined for this Component. If 7445 * this method returns <code>false</code>, this Component is inheriting the 7446 * Set from an ancestor, or from the current KeyboardFocusManager. 7447 * 7448 * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7449 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7450 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS 7451 * @return <code>true</code> if the Set of focus traversal keys for the 7452 * given focus traversal operation has been explicitly defined for 7453 * this Component; <code>false</code> otherwise. 7454 * @throws IllegalArgumentException if id is not one of 7455 * KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, 7456 * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or 7457 * KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS 7458 * @since 1.4 7459 */ 7460 public boolean areFocusTraversalKeysSet(int id) { 7461 if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) { 7462 throw new IllegalArgumentException("invalid focus traversal key identifier"); 7463 } 7464 7465 return (focusTraversalKeys != null && focusTraversalKeys[id] != null); 7466 } 7467 7468 /** 7469 * Sets whether focus traversal keys are enabled for this Component. 7470 * Components for which focus traversal keys are disabled receive key 7471 * events for focus traversal keys. Components for which focus traversal 7472 * keys are enabled do not see these events; instead, the events are 7473 * automatically converted to traversal operations. 7474 * 7475 * @param focusTraversalKeysEnabled whether focus traversal keys are 7476 * enabled for this Component 7477 * @see #getFocusTraversalKeysEnabled 7478 * @see #setFocusTraversalKeys 7479 * @see #getFocusTraversalKeys 7480 * @since 1.4 7481 * @beaninfo 7482 * bound: true 7483 */ 7484 public void setFocusTraversalKeysEnabled(boolean 7485 focusTraversalKeysEnabled) { 7486 boolean oldFocusTraversalKeysEnabled; 7487 synchronized (this) { 7488 oldFocusTraversalKeysEnabled = this.focusTraversalKeysEnabled; 7489 this.focusTraversalKeysEnabled = focusTraversalKeysEnabled; 7490 } 7491 firePropertyChange("focusTraversalKeysEnabled", 7492 oldFocusTraversalKeysEnabled, 7493 focusTraversalKeysEnabled); 7494 } 7495 7496 /** 7497 * Returns whether focus traversal keys are enabled for this Component. 7498 * Components for which focus traversal keys are disabled receive key 7499 * events for focus traversal keys. Components for which focus traversal 7500 * keys are enabled do not see these events; instead, the events are 7501 * automatically converted to traversal operations. 7502 * 7503 * @return whether focus traversal keys are enabled for this Component 7504 * @see #setFocusTraversalKeysEnabled 7505 * @see #setFocusTraversalKeys 7506 * @see #getFocusTraversalKeys 7507 * @since 1.4 7508 */ 7509 public boolean getFocusTraversalKeysEnabled() { 7510 return focusTraversalKeysEnabled; 7511 } 7512 7513 /** 7514 * Requests that this Component get the input focus, and that this 7515 * Component's top-level ancestor become the focused Window. This 7516 * component must be displayable, focusable, visible and all of 7517 * its ancestors (with the exception of the top-level Window) must 7518 * be visible for the request to be granted. Every effort will be 7519 * made to honor the request; however, in some cases it may be 7520 * impossible to do so. Developers must never assume that this 7521 * Component is the focus owner until this Component receives a 7522 * FOCUS_GAINED event. If this request is denied because this 7523 * Component's top-level Window cannot become the focused Window, 7524 * the request will be remembered and will be granted when the 7525 * Window is later focused by the user. 7526 * <p> 7527 * This method cannot be used to set the focus owner to no Component at 7528 * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code> 7529 * instead. 7530 * <p> 7531 * Because the focus behavior of this method is platform-dependent, 7532 * developers are strongly encouraged to use 7533 * <code>requestFocusInWindow</code> when possible. 7534 * 7535 * <p>Note: Not all focus transfers result from invoking this method. As 7536 * such, a component may receive focus without this or any of the other 7537 * {@code requestFocus} methods of {@code Component} being invoked. 7538 * 7539 * @see #requestFocusInWindow 7540 * @see java.awt.event.FocusEvent 7541 * @see #addFocusListener 7542 * @see #isFocusable 7543 * @see #isDisplayable 7544 * @see KeyboardFocusManager#clearGlobalFocusOwner 7545 * @since 1.0 7546 */ 7547 public void requestFocus() { 7548 requestFocusHelper(false, true); 7549 } 7550 7551 boolean requestFocus(CausedFocusEvent.Cause cause) { 7552 return requestFocusHelper(false, true, cause); 7553 } 7554 7555 /** 7556 * Requests that this <code>Component</code> get the input focus, 7557 * and that this <code>Component</code>'s top-level ancestor 7558 * become the focused <code>Window</code>. This component must be 7559 * displayable, focusable, visible and all of its ancestors (with 7560 * the exception of the top-level Window) must be visible for the 7561 * request to be granted. Every effort will be made to honor the 7562 * request; however, in some cases it may be impossible to do 7563 * so. Developers must never assume that this component is the 7564 * focus owner until this component receives a FOCUS_GAINED 7565 * event. If this request is denied because this component's 7566 * top-level window cannot become the focused window, the request 7567 * will be remembered and will be granted when the window is later 7568 * focused by the user. 7569 * <p> 7570 * This method returns a boolean value. If <code>false</code> is returned, 7571 * the request is <b>guaranteed to fail</b>. If <code>true</code> is 7572 * returned, the request will succeed <b>unless</b> it is vetoed, or an 7573 * extraordinary event, such as disposal of the component's peer, occurs 7574 * before the request can be granted by the native windowing system. Again, 7575 * while a return value of <code>true</code> indicates that the request is 7576 * likely to succeed, developers must never assume that this component is 7577 * the focus owner until this component receives a FOCUS_GAINED event. 7578 * <p> 7579 * This method cannot be used to set the focus owner to no component at 7580 * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code> 7581 * instead. 7582 * <p> 7583 * Because the focus behavior of this method is platform-dependent, 7584 * developers are strongly encouraged to use 7585 * <code>requestFocusInWindow</code> when possible. 7586 * <p> 7587 * Every effort will be made to ensure that <code>FocusEvent</code>s 7588 * generated as a 7589 * result of this request will have the specified temporary value. However, 7590 * because specifying an arbitrary temporary state may not be implementable 7591 * on all native windowing systems, correct behavior for this method can be 7592 * guaranteed only for lightweight <code>Component</code>s. 7593 * This method is not intended 7594 * for general use, but exists instead as a hook for lightweight component 7595 * libraries, such as Swing. 7596 * 7597 * <p>Note: Not all focus transfers result from invoking this method. As 7598 * such, a component may receive focus without this or any of the other 7599 * {@code requestFocus} methods of {@code Component} being invoked. 7600 * 7601 * @param temporary true if the focus change is temporary, 7602 * such as when the window loses the focus; for 7603 * more information on temporary focus changes see the 7604 *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a> 7605 * @return <code>false</code> if the focus change request is guaranteed to 7606 * fail; <code>true</code> if it is likely to succeed 7607 * @see java.awt.event.FocusEvent 7608 * @see #addFocusListener 7609 * @see #isFocusable 7610 * @see #isDisplayable 7611 * @see KeyboardFocusManager#clearGlobalFocusOwner 7612 * @since 1.4 7613 */ 7614 protected boolean requestFocus(boolean temporary) { 7615 return requestFocusHelper(temporary, true); 7616 } 7617 7618 boolean requestFocus(boolean temporary, CausedFocusEvent.Cause cause) { 7619 return requestFocusHelper(temporary, true, cause); 7620 } 7621 /** 7622 * Requests that this Component get the input focus, if this 7623 * Component's top-level ancestor is already the focused 7624 * Window. This component must be displayable, focusable, visible 7625 * and all of its ancestors (with the exception of the top-level 7626 * Window) must be visible for the request to be granted. Every 7627 * effort will be made to honor the request; however, in some 7628 * cases it may be impossible to do so. Developers must never 7629 * assume that this Component is the focus owner until this 7630 * Component receives a FOCUS_GAINED event. 7631 * <p> 7632 * This method returns a boolean value. If <code>false</code> is returned, 7633 * the request is <b>guaranteed to fail</b>. If <code>true</code> is 7634 * returned, the request will succeed <b>unless</b> it is vetoed, or an 7635 * extraordinary event, such as disposal of the Component's peer, occurs 7636 * before the request can be granted by the native windowing system. Again, 7637 * while a return value of <code>true</code> indicates that the request is 7638 * likely to succeed, developers must never assume that this Component is 7639 * the focus owner until this Component receives a FOCUS_GAINED event. 7640 * <p> 7641 * This method cannot be used to set the focus owner to no Component at 7642 * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code> 7643 * instead. 7644 * <p> 7645 * The focus behavior of this method can be implemented uniformly across 7646 * platforms, and thus developers are strongly encouraged to use this 7647 * method over <code>requestFocus</code> when possible. Code which relies 7648 * on <code>requestFocus</code> may exhibit different focus behavior on 7649 * different platforms. 7650 * 7651 * <p>Note: Not all focus transfers result from invoking this method. As 7652 * such, a component may receive focus without this or any of the other 7653 * {@code requestFocus} methods of {@code Component} being invoked. 7654 * 7655 * @return <code>false</code> if the focus change request is guaranteed to 7656 * fail; <code>true</code> if it is likely to succeed 7657 * @see #requestFocus 7658 * @see java.awt.event.FocusEvent 7659 * @see #addFocusListener 7660 * @see #isFocusable 7661 * @see #isDisplayable 7662 * @see KeyboardFocusManager#clearGlobalFocusOwner 7663 * @since 1.4 7664 */ 7665 public boolean requestFocusInWindow() { 7666 return requestFocusHelper(false, false); 7667 } 7668 7669 boolean requestFocusInWindow(CausedFocusEvent.Cause cause) { 7670 return requestFocusHelper(false, false, cause); 7671 } 7672 7673 /** 7674 * Requests that this <code>Component</code> get the input focus, 7675 * if this <code>Component</code>'s top-level ancestor is already 7676 * the focused <code>Window</code>. This component must be 7677 * displayable, focusable, visible and all of its ancestors (with 7678 * the exception of the top-level Window) must be visible for the 7679 * request to be granted. Every effort will be made to honor the 7680 * request; however, in some cases it may be impossible to do 7681 * so. Developers must never assume that this component is the 7682 * focus owner until this component receives a FOCUS_GAINED event. 7683 * <p> 7684 * This method returns a boolean value. If <code>false</code> is returned, 7685 * the request is <b>guaranteed to fail</b>. If <code>true</code> is 7686 * returned, the request will succeed <b>unless</b> it is vetoed, or an 7687 * extraordinary event, such as disposal of the component's peer, occurs 7688 * before the request can be granted by the native windowing system. Again, 7689 * while a return value of <code>true</code> indicates that the request is 7690 * likely to succeed, developers must never assume that this component is 7691 * the focus owner until this component receives a FOCUS_GAINED event. 7692 * <p> 7693 * This method cannot be used to set the focus owner to no component at 7694 * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code> 7695 * instead. 7696 * <p> 7697 * The focus behavior of this method can be implemented uniformly across 7698 * platforms, and thus developers are strongly encouraged to use this 7699 * method over <code>requestFocus</code> when possible. Code which relies 7700 * on <code>requestFocus</code> may exhibit different focus behavior on 7701 * different platforms. 7702 * <p> 7703 * Every effort will be made to ensure that <code>FocusEvent</code>s 7704 * generated as a 7705 * result of this request will have the specified temporary value. However, 7706 * because specifying an arbitrary temporary state may not be implementable 7707 * on all native windowing systems, correct behavior for this method can be 7708 * guaranteed only for lightweight components. This method is not intended 7709 * for general use, but exists instead as a hook for lightweight component 7710 * libraries, such as Swing. 7711 * 7712 * <p>Note: Not all focus transfers result from invoking this method. As 7713 * such, a component may receive focus without this or any of the other 7714 * {@code requestFocus} methods of {@code Component} being invoked. 7715 * 7716 * @param temporary true if the focus change is temporary, 7717 * such as when the window loses the focus; for 7718 * more information on temporary focus changes see the 7719 *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a> 7720 * @return <code>false</code> if the focus change request is guaranteed to 7721 * fail; <code>true</code> if it is likely to succeed 7722 * @see #requestFocus 7723 * @see java.awt.event.FocusEvent 7724 * @see #addFocusListener 7725 * @see #isFocusable 7726 * @see #isDisplayable 7727 * @see KeyboardFocusManager#clearGlobalFocusOwner 7728 * @since 1.4 7729 */ 7730 protected boolean requestFocusInWindow(boolean temporary) { 7731 return requestFocusHelper(temporary, false); 7732 } 7733 7734 boolean requestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause) { 7735 return requestFocusHelper(temporary, false, cause); 7736 } 7737 7738 final boolean requestFocusHelper(boolean temporary, 7739 boolean focusedWindowChangeAllowed) { 7740 return requestFocusHelper(temporary, focusedWindowChangeAllowed, CausedFocusEvent.Cause.UNKNOWN); 7741 } 7742 7743 final boolean requestFocusHelper(boolean temporary, 7744 boolean focusedWindowChangeAllowed, 7745 CausedFocusEvent.Cause cause) 7746 { 7747 // 1) Check if the event being dispatched is a system-generated mouse event. 7748 AWTEvent currentEvent = EventQueue.getCurrentEvent(); 7749 if (currentEvent instanceof MouseEvent && 7750 SunToolkit.isSystemGenerated(currentEvent)) 7751 { 7752 // 2) Sanity check: if the mouse event component source belongs to the same containing window. 7753 Component source = ((MouseEvent)currentEvent).getComponent(); 7754 if (source == null || source.getContainingWindow() == getContainingWindow()) { 7755 focusLog.finest("requesting focus by mouse event \"in window\""); 7756 7757 // If both the conditions are fulfilled the focus request should be strictly 7758 // bounded by the toplevel window. It's assumed that the mouse event activates 7759 // the window (if it wasn't active) and this makes it possible for a focus 7760 // request with a strong in-window requirement to change focus in the bounds 7761 // of the toplevel. If, by any means, due to asynchronous nature of the event 7762 // dispatching mechanism, the window happens to be natively inactive by the time 7763 // this focus request is eventually handled, it should not re-activate the 7764 // toplevel. Otherwise the result may not meet user expectations. See 6981400. 7765 focusedWindowChangeAllowed = false; 7766 } 7767 } 7768 if (!isRequestFocusAccepted(temporary, focusedWindowChangeAllowed, cause)) { 7769 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7770 focusLog.finest("requestFocus is not accepted"); 7771 } 7772 return false; 7773 } 7774 // Update most-recent map 7775 KeyboardFocusManager.setMostRecentFocusOwner(this); 7776 7777 Component window = this; 7778 while ( (window != null) && !(window instanceof Window)) { 7779 if (!window.isVisible()) { 7780 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7781 focusLog.finest("component is recursively invisible"); 7782 } 7783 return false; 7784 } 7785 window = window.parent; 7786 } 7787 7788 ComponentPeer peer = this.peer; 7789 Component heavyweight = (peer instanceof LightweightPeer) 7790 ? getNativeContainer() : this; 7791 if (heavyweight == null || !heavyweight.isVisible()) { 7792 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7793 focusLog.finest("Component is not a part of visible hierarchy"); 7794 } 7795 return false; 7796 } 7797 peer = heavyweight.peer; 7798 if (peer == null) { 7799 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7800 focusLog.finest("Peer is null"); 7801 } 7802 return false; 7803 } 7804 7805 // Focus this Component 7806 long time = 0; 7807 if (EventQueue.isDispatchThread()) { 7808 time = Toolkit.getEventQueue().getMostRecentKeyEventTime(); 7809 } else { 7810 // A focus request made from outside EDT should not be associated with any event 7811 // and so its time stamp is simply set to the current time. 7812 time = System.currentTimeMillis(); 7813 } 7814 7815 boolean success = peer.requestFocus 7816 (this, temporary, focusedWindowChangeAllowed, time, cause); 7817 if (!success) { 7818 KeyboardFocusManager.getCurrentKeyboardFocusManager 7819 (appContext).dequeueKeyEvents(time, this); 7820 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7821 focusLog.finest("Peer request failed"); 7822 } 7823 } else { 7824 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7825 focusLog.finest("Pass for " + this); 7826 } 7827 } 7828 return success; 7829 } 7830 7831 private boolean isRequestFocusAccepted(boolean temporary, 7832 boolean focusedWindowChangeAllowed, 7833 CausedFocusEvent.Cause cause) 7834 { 7835 if (!isFocusable() || !isVisible()) { 7836 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7837 focusLog.finest("Not focusable or not visible"); 7838 } 7839 return false; 7840 } 7841 7842 ComponentPeer peer = this.peer; 7843 if (peer == null) { 7844 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7845 focusLog.finest("peer is null"); 7846 } 7847 return false; 7848 } 7849 7850 Window window = getContainingWindow(); 7851 if (window == null || !window.isFocusableWindow()) { 7852 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7853 focusLog.finest("Component doesn't have toplevel"); 7854 } 7855 return false; 7856 } 7857 7858 // We have passed all regular checks for focus request, 7859 // now let's call RequestFocusController and see what it says. 7860 Component focusOwner = KeyboardFocusManager.getMostRecentFocusOwner(window); 7861 if (focusOwner == null) { 7862 // sometimes most recent focus owner may be null, but focus owner is not 7863 // e.g. we reset most recent focus owner if user removes focus owner 7864 focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(); 7865 if (focusOwner != null && focusOwner.getContainingWindow() != window) { 7866 focusOwner = null; 7867 } 7868 } 7869 7870 if (focusOwner == this || focusOwner == null) { 7871 // Controller is supposed to verify focus transfers and for this it 7872 // should know both from and to components. And it shouldn't verify 7873 // transfers from when these components are equal. 7874 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7875 focusLog.finest("focus owner is null or this"); 7876 } 7877 return true; 7878 } 7879 7880 if (CausedFocusEvent.Cause.ACTIVATION == cause) { 7881 // we shouldn't call RequestFocusController in case we are 7882 // in activation. We do request focus on component which 7883 // has got temporary focus lost and then on component which is 7884 // most recent focus owner. But most recent focus owner can be 7885 // changed by requestFocusXXX() call only, so this transfer has 7886 // been already approved. 7887 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7888 focusLog.finest("cause is activation"); 7889 } 7890 return true; 7891 } 7892 7893 boolean ret = Component.requestFocusController.acceptRequestFocus(focusOwner, 7894 this, 7895 temporary, 7896 focusedWindowChangeAllowed, 7897 cause); 7898 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) { 7899 focusLog.finest("RequestFocusController returns {0}", ret); 7900 } 7901 7902 return ret; 7903 } 7904 7905 private static RequestFocusController requestFocusController = new DummyRequestFocusController(); 7906 7907 // Swing access this method through reflection to implement InputVerifier's functionality. 7908 // Perhaps, we should make this method public (later ;) 7909 private static class DummyRequestFocusController implements RequestFocusController { 7910 public boolean acceptRequestFocus(Component from, Component to, 7911 boolean temporary, boolean focusedWindowChangeAllowed, 7912 CausedFocusEvent.Cause cause) 7913 { 7914 return true; 7915 } 7916 }; 7917 7918 synchronized static void setRequestFocusController(RequestFocusController requestController) 7919 { 7920 if (requestController == null) { 7921 requestFocusController = new DummyRequestFocusController(); 7922 } else { 7923 requestFocusController = requestController; 7924 } 7925 } 7926 7927 /** 7928 * Returns the Container which is the focus cycle root of this Component's 7929 * focus traversal cycle. Each focus traversal cycle has only a single 7930 * focus cycle root and each Component which is not a Container belongs to 7931 * only a single focus traversal cycle. Containers which are focus cycle 7932 * roots belong to two cycles: one rooted at the Container itself, and one 7933 * rooted at the Container's nearest focus-cycle-root ancestor. For such 7934 * Containers, this method will return the Container's nearest focus-cycle- 7935 * root ancestor. 7936 * 7937 * @return this Component's nearest focus-cycle-root ancestor 7938 * @see Container#isFocusCycleRoot() 7939 * @since 1.4 7940 */ 7941 public Container getFocusCycleRootAncestor() { 7942 Container rootAncestor = this.parent; 7943 while (rootAncestor != null && !rootAncestor.isFocusCycleRoot()) { 7944 rootAncestor = rootAncestor.parent; 7945 } 7946 return rootAncestor; 7947 } 7948 7949 /** 7950 * Returns whether the specified Container is the focus cycle root of this 7951 * Component's focus traversal cycle. Each focus traversal cycle has only 7952 * a single focus cycle root and each Component which is not a Container 7953 * belongs to only a single focus traversal cycle. 7954 * 7955 * @param container the Container to be tested 7956 * @return <code>true</code> if the specified Container is a focus-cycle- 7957 * root of this Component; <code>false</code> otherwise 7958 * @see Container#isFocusCycleRoot() 7959 * @since 1.4 7960 */ 7961 public boolean isFocusCycleRoot(Container container) { 7962 Container rootAncestor = getFocusCycleRootAncestor(); 7963 return (rootAncestor == container); 7964 } 7965 7966 Container getTraversalRoot() { 7967 return getFocusCycleRootAncestor(); 7968 } 7969 7970 /** 7971 * Transfers the focus to the next component, as though this Component were 7972 * the focus owner. 7973 * @see #requestFocus() 7974 * @since 1.1 7975 */ 7976 public void transferFocus() { 7977 nextFocus(); 7978 } 7979 7980 /** 7981 * @deprecated As of JDK version 1.1, 7982 * replaced by transferFocus(). 7983 */ 7984 @Deprecated 7985 public void nextFocus() { 7986 transferFocus(false); 7987 } 7988 7989 boolean transferFocus(boolean clearOnFailure) { 7990 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 7991 focusLog.finer("clearOnFailure = " + clearOnFailure); 7992 } 7993 Component toFocus = getNextFocusCandidate(); 7994 boolean res = false; 7995 if (toFocus != null && !toFocus.isFocusOwner() && toFocus != this) { 7996 res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_FORWARD); 7997 } 7998 if (clearOnFailure && !res) { 7999 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8000 focusLog.finer("clear global focus owner"); 8001 } 8002 KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv(); 8003 } 8004 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8005 focusLog.finer("returning result: " + res); 8006 } 8007 return res; 8008 } 8009 8010 final Component getNextFocusCandidate() { 8011 Container rootAncestor = getTraversalRoot(); 8012 Component comp = this; 8013 while (rootAncestor != null && 8014 !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner())) 8015 { 8016 comp = rootAncestor; 8017 rootAncestor = comp.getFocusCycleRootAncestor(); 8018 } 8019 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8020 focusLog.finer("comp = " + comp + ", root = " + rootAncestor); 8021 } 8022 Component candidate = null; 8023 if (rootAncestor != null) { 8024 FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy(); 8025 Component toFocus = policy.getComponentAfter(rootAncestor, comp); 8026 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8027 focusLog.finer("component after is " + toFocus); 8028 } 8029 if (toFocus == null) { 8030 toFocus = policy.getDefaultComponent(rootAncestor); 8031 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8032 focusLog.finer("default component is " + toFocus); 8033 } 8034 } 8035 if (toFocus == null) { 8036 Applet applet = EmbeddedFrame.getAppletIfAncestorOf(this); 8037 if (applet != null) { 8038 toFocus = applet; 8039 } 8040 } 8041 candidate = toFocus; 8042 } 8043 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8044 focusLog.finer("Focus transfer candidate: " + candidate); 8045 } 8046 return candidate; 8047 } 8048 8049 /** 8050 * Transfers the focus to the previous component, as though this Component 8051 * were the focus owner. 8052 * @see #requestFocus() 8053 * @since 1.4 8054 */ 8055 public void transferFocusBackward() { 8056 transferFocusBackward(false); 8057 } 8058 8059 boolean transferFocusBackward(boolean clearOnFailure) { 8060 Container rootAncestor = getTraversalRoot(); 8061 Component comp = this; 8062 while (rootAncestor != null && 8063 !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner())) 8064 { 8065 comp = rootAncestor; 8066 rootAncestor = comp.getFocusCycleRootAncestor(); 8067 } 8068 boolean res = false; 8069 if (rootAncestor != null) { 8070 FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy(); 8071 Component toFocus = policy.getComponentBefore(rootAncestor, comp); 8072 if (toFocus == null) { 8073 toFocus = policy.getDefaultComponent(rootAncestor); 8074 } 8075 if (toFocus != null) { 8076 res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_BACKWARD); 8077 } 8078 } 8079 if (clearOnFailure && !res) { 8080 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8081 focusLog.finer("clear global focus owner"); 8082 } 8083 KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv(); 8084 } 8085 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) { 8086 focusLog.finer("returning result: " + res); 8087 } 8088 return res; 8089 } 8090 8091 /** 8092 * Transfers the focus up one focus traversal cycle. Typically, the focus 8093 * owner is set to this Component's focus cycle root, and the current focus 8094 * cycle root is set to the new focus owner's focus cycle root. If, 8095 * however, this Component's focus cycle root is a Window, then the focus 8096 * owner is set to the focus cycle root's default Component to focus, and 8097 * the current focus cycle root is unchanged. 8098 * 8099 * @see #requestFocus() 8100 * @see Container#isFocusCycleRoot() 8101 * @see Container#setFocusCycleRoot(boolean) 8102 * @since 1.4 8103 */ 8104 public void transferFocusUpCycle() { 8105 Container rootAncestor; 8106 for (rootAncestor = getFocusCycleRootAncestor(); 8107 rootAncestor != null && !(rootAncestor.isShowing() && 8108 rootAncestor.isFocusable() && 8109 rootAncestor.isEnabled()); 8110 rootAncestor = rootAncestor.getFocusCycleRootAncestor()) { 8111 } 8112 8113 if (rootAncestor != null) { 8114 Container rootAncestorRootAncestor = 8115 rootAncestor.getFocusCycleRootAncestor(); 8116 Container fcr = (rootAncestorRootAncestor != null) ? 8117 rootAncestorRootAncestor : rootAncestor; 8118 8119 KeyboardFocusManager.getCurrentKeyboardFocusManager(). 8120 setGlobalCurrentFocusCycleRootPriv(fcr); 8121 rootAncestor.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP); 8122 } else { 8123 Window window = getContainingWindow(); 8124 8125 if (window != null) { 8126 Component toFocus = window.getFocusTraversalPolicy(). 8127 getDefaultComponent(window); 8128 if (toFocus != null) { 8129 KeyboardFocusManager.getCurrentKeyboardFocusManager(). 8130 setGlobalCurrentFocusCycleRootPriv(window); 8131 toFocus.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP); 8132 } 8133 } 8134 } 8135 } 8136 8137 /** 8138 * Returns <code>true</code> if this <code>Component</code> is the 8139 * focus owner. This method is obsolete, and has been replaced by 8140 * <code>isFocusOwner()</code>. 8141 * 8142 * @return <code>true</code> if this <code>Component</code> is the 8143 * focus owner; <code>false</code> otherwise 8144 * @since 1.2 8145 */ 8146 public boolean hasFocus() { 8147 return (KeyboardFocusManager.getCurrentKeyboardFocusManager(). 8148 getFocusOwner() == this); 8149 } 8150 8151 /** 8152 * Returns <code>true</code> if this <code>Component</code> is the 8153 * focus owner. 8154 * 8155 * @return <code>true</code> if this <code>Component</code> is the 8156 * focus owner; <code>false</code> otherwise 8157 * @since 1.4 8158 */ 8159 public boolean isFocusOwner() { 8160 return hasFocus(); 8161 } 8162 8163 /* 8164 * Used to disallow auto-focus-transfer on disposal of the focus owner 8165 * in the process of disposing its parent container. 8166 */ 8167 private boolean autoFocusTransferOnDisposal = true; 8168 8169 void setAutoFocusTransferOnDisposal(boolean value) { 8170 autoFocusTransferOnDisposal = value; 8171 } 8172 8173 boolean isAutoFocusTransferOnDisposal() { 8174 return autoFocusTransferOnDisposal; 8175 } 8176 8177 /** 8178 * Adds the specified popup menu to the component. 8179 * @param popup the popup menu to be added to the component. 8180 * @see #remove(MenuComponent) 8181 * @exception NullPointerException if {@code popup} is {@code null} 8182 * @since 1.1 8183 */ 8184 public void add(PopupMenu popup) { 8185 synchronized (getTreeLock()) { 8186 if (popup.parent != null) { 8187 popup.parent.remove(popup); 8188 } 8189 if (popups == null) { 8190 popups = new Vector<PopupMenu>(); 8191 } 8192 popups.addElement(popup); 8193 popup.parent = this; 8194 8195 if (peer != null) { 8196 if (popup.peer == null) { 8197 popup.addNotify(); 8198 } 8199 } 8200 } 8201 } 8202 8203 /** 8204 * Removes the specified popup menu from the component. 8205 * @param popup the popup menu to be removed 8206 * @see #add(PopupMenu) 8207 * @since 1.1 8208 */ 8209 @SuppressWarnings("unchecked") 8210 public void remove(MenuComponent popup) { 8211 synchronized (getTreeLock()) { 8212 if (popups == null) { 8213 return; 8214 } 8215 int index = popups.indexOf(popup); 8216 if (index >= 0) { 8217 PopupMenu pmenu = (PopupMenu)popup; 8218 if (pmenu.peer != null) { 8219 pmenu.removeNotify(); 8220 } 8221 pmenu.parent = null; 8222 popups.removeElementAt(index); 8223 if (popups.size() == 0) { 8224 popups = null; 8225 } 8226 } 8227 } 8228 } 8229 8230 /** 8231 * Returns a string representing the state of this component. This 8232 * method is intended to be used only for debugging purposes, and the 8233 * content and format of the returned string may vary between 8234 * implementations. The returned string may be empty but may not be 8235 * <code>null</code>. 8236 * 8237 * @return a string representation of this component's state 8238 * @since 1.0 8239 */ 8240 protected String paramString() { 8241 final String thisName = Objects.toString(getName(), ""); 8242 final String invalid = isValid() ? "" : ",invalid"; 8243 final String hidden = visible ? "" : ",hidden"; 8244 final String disabled = enabled ? "" : ",disabled"; 8245 return thisName + ',' + x + ',' + y + ',' + width + 'x' + height 8246 + invalid + hidden + disabled; 8247 } 8248 8249 /** 8250 * Returns a string representation of this component and its values. 8251 * @return a string representation of this component 8252 * @since 1.0 8253 */ 8254 public String toString() { 8255 return getClass().getName() + '[' + paramString() + ']'; 8256 } 8257 8258 /** 8259 * Prints a listing of this component to the standard system output 8260 * stream <code>System.out</code>. 8261 * @see java.lang.System#out 8262 * @since 1.0 8263 */ 8264 public void list() { 8265 list(System.out, 0); 8266 } 8267 8268 /** 8269 * Prints a listing of this component to the specified output 8270 * stream. 8271 * @param out a print stream 8272 * @throws NullPointerException if {@code out} is {@code null} 8273 * @since 1.0 8274 */ 8275 public void list(PrintStream out) { 8276 list(out, 0); 8277 } 8278 8279 /** 8280 * Prints out a list, starting at the specified indentation, to the 8281 * specified print stream. 8282 * @param out a print stream 8283 * @param indent number of spaces to indent 8284 * @see java.io.PrintStream#println(java.lang.Object) 8285 * @throws NullPointerException if {@code out} is {@code null} 8286 * @since 1.0 8287 */ 8288 public void list(PrintStream out, int indent) { 8289 for (int i = 0 ; i < indent ; i++) { 8290 out.print(" "); 8291 } 8292 out.println(this); 8293 } 8294 8295 /** 8296 * Prints a listing to the specified print writer. 8297 * @param out the print writer to print to 8298 * @throws NullPointerException if {@code out} is {@code null} 8299 * @since 1.1 8300 */ 8301 public void list(PrintWriter out) { 8302 list(out, 0); 8303 } 8304 8305 /** 8306 * Prints out a list, starting at the specified indentation, to 8307 * the specified print writer. 8308 * @param out the print writer to print to 8309 * @param indent the number of spaces to indent 8310 * @throws NullPointerException if {@code out} is {@code null} 8311 * @see java.io.PrintStream#println(java.lang.Object) 8312 * @since 1.1 8313 */ 8314 public void list(PrintWriter out, int indent) { 8315 for (int i = 0 ; i < indent ; i++) { 8316 out.print(" "); 8317 } 8318 out.println(this); 8319 } 8320 8321 /* 8322 * Fetches the native container somewhere higher up in the component 8323 * tree that contains this component. 8324 */ 8325 final Container getNativeContainer() { 8326 Container p = getContainer(); 8327 while (p != null && p.peer instanceof LightweightPeer) { 8328 p = p.getContainer(); 8329 } 8330 return p; 8331 } 8332 8333 /** 8334 * Adds a PropertyChangeListener to the listener list. The listener is 8335 * registered for all bound properties of this class, including the 8336 * following: 8337 * <ul> 8338 * <li>this Component's font ("font")</li> 8339 * <li>this Component's background color ("background")</li> 8340 * <li>this Component's foreground color ("foreground")</li> 8341 * <li>this Component's focusability ("focusable")</li> 8342 * <li>this Component's focus traversal keys enabled state 8343 * ("focusTraversalKeysEnabled")</li> 8344 * <li>this Component's Set of FORWARD_TRAVERSAL_KEYS 8345 * ("forwardFocusTraversalKeys")</li> 8346 * <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS 8347 * ("backwardFocusTraversalKeys")</li> 8348 * <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS 8349 * ("upCycleFocusTraversalKeys")</li> 8350 * <li>this Component's preferred size ("preferredSize")</li> 8351 * <li>this Component's minimum size ("minimumSize")</li> 8352 * <li>this Component's maximum size ("maximumSize")</li> 8353 * <li>this Component's name ("name")</li> 8354 * </ul> 8355 * Note that if this <code>Component</code> is inheriting a bound property, then no 8356 * event will be fired in response to a change in the inherited property. 8357 * <p> 8358 * If <code>listener</code> is <code>null</code>, 8359 * no exception is thrown and no action is performed. 8360 * 8361 * @param listener the property change listener to be added 8362 * 8363 * @see #removePropertyChangeListener 8364 * @see #getPropertyChangeListeners 8365 * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8366 */ 8367 public void addPropertyChangeListener( 8368 PropertyChangeListener listener) { 8369 synchronized (getObjectLock()) { 8370 if (listener == null) { 8371 return; 8372 } 8373 if (changeSupport == null) { 8374 changeSupport = new PropertyChangeSupport(this); 8375 } 8376 changeSupport.addPropertyChangeListener(listener); 8377 } 8378 } 8379 8380 /** 8381 * Removes a PropertyChangeListener from the listener list. This method 8382 * should be used to remove PropertyChangeListeners that were registered 8383 * for all bound properties of this class. 8384 * <p> 8385 * If listener is null, no exception is thrown and no action is performed. 8386 * 8387 * @param listener the PropertyChangeListener to be removed 8388 * 8389 * @see #addPropertyChangeListener 8390 * @see #getPropertyChangeListeners 8391 * @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener) 8392 */ 8393 public void removePropertyChangeListener( 8394 PropertyChangeListener listener) { 8395 synchronized (getObjectLock()) { 8396 if (listener == null || changeSupport == null) { 8397 return; 8398 } 8399 changeSupport.removePropertyChangeListener(listener); 8400 } 8401 } 8402 8403 /** 8404 * Returns an array of all the property change listeners 8405 * registered on this component. 8406 * 8407 * @return all of this component's <code>PropertyChangeListener</code>s 8408 * or an empty array if no property change 8409 * listeners are currently registered 8410 * 8411 * @see #addPropertyChangeListener 8412 * @see #removePropertyChangeListener 8413 * @see #getPropertyChangeListeners(java.lang.String) 8414 * @see java.beans.PropertyChangeSupport#getPropertyChangeListeners 8415 * @since 1.4 8416 */ 8417 public PropertyChangeListener[] getPropertyChangeListeners() { 8418 synchronized (getObjectLock()) { 8419 if (changeSupport == null) { 8420 return new PropertyChangeListener[0]; 8421 } 8422 return changeSupport.getPropertyChangeListeners(); 8423 } 8424 } 8425 8426 /** 8427 * Adds a PropertyChangeListener to the listener list for a specific 8428 * property. The specified property may be user-defined, or one of the 8429 * following: 8430 * <ul> 8431 * <li>this Component's font ("font")</li> 8432 * <li>this Component's background color ("background")</li> 8433 * <li>this Component's foreground color ("foreground")</li> 8434 * <li>this Component's focusability ("focusable")</li> 8435 * <li>this Component's focus traversal keys enabled state 8436 * ("focusTraversalKeysEnabled")</li> 8437 * <li>this Component's Set of FORWARD_TRAVERSAL_KEYS 8438 * ("forwardFocusTraversalKeys")</li> 8439 * <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS 8440 * ("backwardFocusTraversalKeys")</li> 8441 * <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS 8442 * ("upCycleFocusTraversalKeys")</li> 8443 * </ul> 8444 * Note that if this <code>Component</code> is inheriting a bound property, then no 8445 * event will be fired in response to a change in the inherited property. 8446 * <p> 8447 * If <code>propertyName</code> or <code>listener</code> is <code>null</code>, 8448 * no exception is thrown and no action is taken. 8449 * 8450 * @param propertyName one of the property names listed above 8451 * @param listener the property change listener to be added 8452 * 8453 * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8454 * @see #getPropertyChangeListeners(java.lang.String) 8455 * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8456 */ 8457 public void addPropertyChangeListener( 8458 String propertyName, 8459 PropertyChangeListener listener) { 8460 synchronized (getObjectLock()) { 8461 if (listener == null) { 8462 return; 8463 } 8464 if (changeSupport == null) { 8465 changeSupport = new PropertyChangeSupport(this); 8466 } 8467 changeSupport.addPropertyChangeListener(propertyName, listener); 8468 } 8469 } 8470 8471 /** 8472 * Removes a <code>PropertyChangeListener</code> from the listener 8473 * list for a specific property. This method should be used to remove 8474 * <code>PropertyChangeListener</code>s 8475 * that were registered for a specific bound property. 8476 * <p> 8477 * If <code>propertyName</code> or <code>listener</code> is <code>null</code>, 8478 * no exception is thrown and no action is taken. 8479 * 8480 * @param propertyName a valid property name 8481 * @param listener the PropertyChangeListener to be removed 8482 * 8483 * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8484 * @see #getPropertyChangeListeners(java.lang.String) 8485 * @see #removePropertyChangeListener(java.beans.PropertyChangeListener) 8486 */ 8487 public void removePropertyChangeListener( 8488 String propertyName, 8489 PropertyChangeListener listener) { 8490 synchronized (getObjectLock()) { 8491 if (listener == null || changeSupport == null) { 8492 return; 8493 } 8494 changeSupport.removePropertyChangeListener(propertyName, listener); 8495 } 8496 } 8497 8498 /** 8499 * Returns an array of all the listeners which have been associated 8500 * with the named property. 8501 * 8502 * @param propertyName the property name 8503 * @return all of the <code>PropertyChangeListener</code>s associated with 8504 * the named property; if no such listeners have been added or 8505 * if <code>propertyName</code> is <code>null</code>, an empty 8506 * array is returned 8507 * 8508 * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8509 * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) 8510 * @see #getPropertyChangeListeners 8511 * @since 1.4 8512 */ 8513 public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) { 8514 synchronized (getObjectLock()) { 8515 if (changeSupport == null) { 8516 return new PropertyChangeListener[0]; 8517 } 8518 return changeSupport.getPropertyChangeListeners(propertyName); 8519 } 8520 } 8521 8522 /** 8523 * Support for reporting bound property changes for Object properties. 8524 * This method can be called when a bound property has changed and it will 8525 * send the appropriate PropertyChangeEvent to any registered 8526 * PropertyChangeListeners. 8527 * 8528 * @param propertyName the property whose value has changed 8529 * @param oldValue the property's previous value 8530 * @param newValue the property's new value 8531 */ 8532 protected void firePropertyChange(String propertyName, 8533 Object oldValue, Object newValue) { 8534 PropertyChangeSupport changeSupport; 8535 synchronized (getObjectLock()) { 8536 changeSupport = this.changeSupport; 8537 } 8538 if (changeSupport == null || 8539 (oldValue != null && newValue != null && oldValue.equals(newValue))) { 8540 return; 8541 } 8542 changeSupport.firePropertyChange(propertyName, oldValue, newValue); 8543 } 8544 8545 /** 8546 * Support for reporting bound property changes for boolean properties. 8547 * This method can be called when a bound property has changed and it will 8548 * send the appropriate PropertyChangeEvent to any registered 8549 * PropertyChangeListeners. 8550 * 8551 * @param propertyName the property whose value has changed 8552 * @param oldValue the property's previous value 8553 * @param newValue the property's new value 8554 * @since 1.4 8555 */ 8556 protected void firePropertyChange(String propertyName, 8557 boolean oldValue, boolean newValue) { 8558 PropertyChangeSupport changeSupport = this.changeSupport; 8559 if (changeSupport == null || oldValue == newValue) { 8560 return; 8561 } 8562 changeSupport.firePropertyChange(propertyName, oldValue, newValue); 8563 } 8564 8565 /** 8566 * Support for reporting bound property changes for integer properties. 8567 * This method can be called when a bound property has changed and it will 8568 * send the appropriate PropertyChangeEvent to any registered 8569 * PropertyChangeListeners. 8570 * 8571 * @param propertyName the property whose value has changed 8572 * @param oldValue the property's previous value 8573 * @param newValue the property's new value 8574 * @since 1.4 8575 */ 8576 protected void firePropertyChange(String propertyName, 8577 int oldValue, int newValue) { 8578 PropertyChangeSupport changeSupport = this.changeSupport; 8579 if (changeSupport == null || oldValue == newValue) { 8580 return; 8581 } 8582 changeSupport.firePropertyChange(propertyName, oldValue, newValue); 8583 } 8584 8585 /** 8586 * Reports a bound property change. 8587 * 8588 * @param propertyName the programmatic name of the property 8589 * that was changed 8590 * @param oldValue the old value of the property (as a byte) 8591 * @param newValue the new value of the property (as a byte) 8592 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8593 * java.lang.Object) 8594 * @since 1.5 8595 */ 8596 public void firePropertyChange(String propertyName, byte oldValue, byte newValue) { 8597 if (changeSupport == null || oldValue == newValue) { 8598 return; 8599 } 8600 firePropertyChange(propertyName, Byte.valueOf(oldValue), Byte.valueOf(newValue)); 8601 } 8602 8603 /** 8604 * Reports a bound property change. 8605 * 8606 * @param propertyName the programmatic name of the property 8607 * that was changed 8608 * @param oldValue the old value of the property (as a char) 8609 * @param newValue the new value of the property (as a char) 8610 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8611 * java.lang.Object) 8612 * @since 1.5 8613 */ 8614 public void firePropertyChange(String propertyName, char oldValue, char newValue) { 8615 if (changeSupport == null || oldValue == newValue) { 8616 return; 8617 } 8618 firePropertyChange(propertyName, Character.valueOf(oldValue), Character.valueOf(newValue)); 8619 } 8620 8621 /** 8622 * Reports a bound property change. 8623 * 8624 * @param propertyName the programmatic name of the property 8625 * that was changed 8626 * @param oldValue the old value of the property (as a short) 8627 * @param newValue the new value of the property (as a short) 8628 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8629 * java.lang.Object) 8630 * @since 1.5 8631 */ 8632 public void firePropertyChange(String propertyName, short oldValue, short newValue) { 8633 if (changeSupport == null || oldValue == newValue) { 8634 return; 8635 } 8636 firePropertyChange(propertyName, Short.valueOf(oldValue), Short.valueOf(newValue)); 8637 } 8638 8639 8640 /** 8641 * Reports a bound property change. 8642 * 8643 * @param propertyName the programmatic name of the property 8644 * that was changed 8645 * @param oldValue the old value of the property (as a long) 8646 * @param newValue the new value of the property (as a long) 8647 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8648 * java.lang.Object) 8649 * @since 1.5 8650 */ 8651 public void firePropertyChange(String propertyName, long oldValue, long newValue) { 8652 if (changeSupport == null || oldValue == newValue) { 8653 return; 8654 } 8655 firePropertyChange(propertyName, Long.valueOf(oldValue), Long.valueOf(newValue)); 8656 } 8657 8658 /** 8659 * Reports a bound property change. 8660 * 8661 * @param propertyName the programmatic name of the property 8662 * that was changed 8663 * @param oldValue the old value of the property (as a float) 8664 * @param newValue the new value of the property (as a float) 8665 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8666 * java.lang.Object) 8667 * @since 1.5 8668 */ 8669 public void firePropertyChange(String propertyName, float oldValue, float newValue) { 8670 if (changeSupport == null || oldValue == newValue) { 8671 return; 8672 } 8673 firePropertyChange(propertyName, Float.valueOf(oldValue), Float.valueOf(newValue)); 8674 } 8675 8676 /** 8677 * Reports a bound property change. 8678 * 8679 * @param propertyName the programmatic name of the property 8680 * that was changed 8681 * @param oldValue the old value of the property (as a double) 8682 * @param newValue the new value of the property (as a double) 8683 * @see #firePropertyChange(java.lang.String, java.lang.Object, 8684 * java.lang.Object) 8685 * @since 1.5 8686 */ 8687 public void firePropertyChange(String propertyName, double oldValue, double newValue) { 8688 if (changeSupport == null || oldValue == newValue) { 8689 return; 8690 } 8691 firePropertyChange(propertyName, Double.valueOf(oldValue), Double.valueOf(newValue)); 8692 } 8693 8694 8695 // Serialization support. 8696 8697 /** 8698 * Component Serialized Data Version. 8699 * 8700 * @serial 8701 */ 8702 private int componentSerializedDataVersion = 4; 8703 8704 /** 8705 * This hack is for Swing serialization. It will invoke 8706 * the Swing package private method <code>compWriteObjectNotify</code>. 8707 */ 8708 private void doSwingSerialization() { 8709 Package swingPackage = Package.getPackage("javax.swing"); 8710 // For Swing serialization to correctly work Swing needs to 8711 // be notified before Component does it's serialization. This 8712 // hack accommodates this. 8713 // 8714 // Swing classes MUST be loaded by the bootstrap class loader, 8715 // otherwise we don't consider them. 8716 for (Class<?> klass = Component.this.getClass(); klass != null; 8717 klass = klass.getSuperclass()) { 8718 if (klass.getPackage() == swingPackage && 8719 klass.getClassLoader() == null) { 8720 final Class<?> swingClass = klass; 8721 // Find the first override of the compWriteObjectNotify method 8722 Method[] methods = AccessController.doPrivileged( 8723 new PrivilegedAction<Method[]>() { 8724 public Method[] run() { 8725 return swingClass.getDeclaredMethods(); 8726 } 8727 }); 8728 for (int counter = methods.length - 1; counter >= 0; 8729 counter--) { 8730 final Method method = methods[counter]; 8731 if (method.getName().equals("compWriteObjectNotify")){ 8732 // We found it, use doPrivileged to make it accessible 8733 // to use. 8734 AccessController.doPrivileged(new PrivilegedAction<Void>() { 8735 public Void run() { 8736 method.setAccessible(true); 8737 return null; 8738 } 8739 }); 8740 // Invoke the method 8741 try { 8742 method.invoke(this, (Object[]) null); 8743 } catch (IllegalAccessException iae) { 8744 } catch (InvocationTargetException ite) { 8745 } 8746 // We're done, bail. 8747 return; 8748 } 8749 } 8750 } 8751 } 8752 } 8753 8754 /** 8755 * Writes default serializable fields to stream. Writes 8756 * a variety of serializable listeners as optional data. 8757 * The non-serializable listeners are detected and 8758 * no attempt is made to serialize them. 8759 * 8760 * @param s the <code>ObjectOutputStream</code> to write 8761 * @serialData <code>null</code> terminated sequence of 8762 * 0 or more pairs; the pair consists of a <code>String</code> 8763 * and an <code>Object</code>; the <code>String</code> indicates 8764 * the type of object and is one of the following (as of 1.4): 8765 * <code>componentListenerK</code> indicating an 8766 * <code>ComponentListener</code> object; 8767 * <code>focusListenerK</code> indicating an 8768 * <code>FocusListener</code> object; 8769 * <code>keyListenerK</code> indicating an 8770 * <code>KeyListener</code> object; 8771 * <code>mouseListenerK</code> indicating an 8772 * <code>MouseListener</code> object; 8773 * <code>mouseMotionListenerK</code> indicating an 8774 * <code>MouseMotionListener</code> object; 8775 * <code>inputMethodListenerK</code> indicating an 8776 * <code>InputMethodListener</code> object; 8777 * <code>hierarchyListenerK</code> indicating an 8778 * <code>HierarchyListener</code> object; 8779 * <code>hierarchyBoundsListenerK</code> indicating an 8780 * <code>HierarchyBoundsListener</code> object; 8781 * <code>mouseWheelListenerK</code> indicating an 8782 * <code>MouseWheelListener</code> object 8783 * @serialData an optional <code>ComponentOrientation</code> 8784 * (after <code>inputMethodListener</code>, as of 1.2) 8785 * 8786 * @see AWTEventMulticaster#save(java.io.ObjectOutputStream, java.lang.String, java.util.EventListener) 8787 * @see #componentListenerK 8788 * @see #focusListenerK 8789 * @see #keyListenerK 8790 * @see #mouseListenerK 8791 * @see #mouseMotionListenerK 8792 * @see #inputMethodListenerK 8793 * @see #hierarchyListenerK 8794 * @see #hierarchyBoundsListenerK 8795 * @see #mouseWheelListenerK 8796 * @see #readObject(ObjectInputStream) 8797 */ 8798 private void writeObject(ObjectOutputStream s) 8799 throws IOException 8800 { 8801 doSwingSerialization(); 8802 8803 s.defaultWriteObject(); 8804 8805 AWTEventMulticaster.save(s, componentListenerK, componentListener); 8806 AWTEventMulticaster.save(s, focusListenerK, focusListener); 8807 AWTEventMulticaster.save(s, keyListenerK, keyListener); 8808 AWTEventMulticaster.save(s, mouseListenerK, mouseListener); 8809 AWTEventMulticaster.save(s, mouseMotionListenerK, mouseMotionListener); 8810 AWTEventMulticaster.save(s, inputMethodListenerK, inputMethodListener); 8811 8812 s.writeObject(null); 8813 s.writeObject(componentOrientation); 8814 8815 AWTEventMulticaster.save(s, hierarchyListenerK, hierarchyListener); 8816 AWTEventMulticaster.save(s, hierarchyBoundsListenerK, 8817 hierarchyBoundsListener); 8818 s.writeObject(null); 8819 8820 AWTEventMulticaster.save(s, mouseWheelListenerK, mouseWheelListener); 8821 s.writeObject(null); 8822 8823 } 8824 8825 /** 8826 * Reads the <code>ObjectInputStream</code> and if it isn't 8827 * <code>null</code> adds a listener to receive a variety 8828 * of events fired by the component. 8829 * Unrecognized keys or values will be ignored. 8830 * 8831 * @param s the <code>ObjectInputStream</code> to read 8832 * @see #writeObject(ObjectOutputStream) 8833 */ 8834 private void readObject(ObjectInputStream s) 8835 throws ClassNotFoundException, IOException 8836 { 8837 objectLock = new Object(); 8838 8839 acc = AccessController.getContext(); 8840 8841 s.defaultReadObject(); 8842 8843 appContext = AppContext.getAppContext(); 8844 coalescingEnabled = checkCoalescing(); 8845 if (componentSerializedDataVersion < 4) { 8846 // These fields are non-transient and rely on default 8847 // serialization. However, the default values are insufficient, 8848 // so we need to set them explicitly for object data streams prior 8849 // to 1.4. 8850 focusable = true; 8851 isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN; 8852 initializeFocusTraversalKeys(); 8853 focusTraversalKeysEnabled = true; 8854 } 8855 8856 Object keyOrNull; 8857 while(null != (keyOrNull = s.readObject())) { 8858 String key = ((String)keyOrNull).intern(); 8859 8860 if (componentListenerK == key) 8861 addComponentListener((ComponentListener)(s.readObject())); 8862 8863 else if (focusListenerK == key) 8864 addFocusListener((FocusListener)(s.readObject())); 8865 8866 else if (keyListenerK == key) 8867 addKeyListener((KeyListener)(s.readObject())); 8868 8869 else if (mouseListenerK == key) 8870 addMouseListener((MouseListener)(s.readObject())); 8871 8872 else if (mouseMotionListenerK == key) 8873 addMouseMotionListener((MouseMotionListener)(s.readObject())); 8874 8875 else if (inputMethodListenerK == key) 8876 addInputMethodListener((InputMethodListener)(s.readObject())); 8877 8878 else // skip value for unrecognized key 8879 s.readObject(); 8880 8881 } 8882 8883 // Read the component's orientation if it's present 8884 Object orient = null; 8885 8886 try { 8887 orient = s.readObject(); 8888 } catch (java.io.OptionalDataException e) { 8889 // JDK 1.1 instances will not have this optional data. 8890 // e.eof will be true to indicate that there is no more 8891 // data available for this object. 8892 // If e.eof is not true, throw the exception as it 8893 // might have been caused by reasons unrelated to 8894 // componentOrientation. 8895 8896 if (!e.eof) { 8897 throw (e); 8898 } 8899 } 8900 8901 if (orient != null) { 8902 componentOrientation = (ComponentOrientation)orient; 8903 } else { 8904 componentOrientation = ComponentOrientation.UNKNOWN; 8905 } 8906 8907 try { 8908 while(null != (keyOrNull = s.readObject())) { 8909 String key = ((String)keyOrNull).intern(); 8910 8911 if (hierarchyListenerK == key) { 8912 addHierarchyListener((HierarchyListener)(s.readObject())); 8913 } 8914 else if (hierarchyBoundsListenerK == key) { 8915 addHierarchyBoundsListener((HierarchyBoundsListener) 8916 (s.readObject())); 8917 } 8918 else { 8919 // skip value for unrecognized key 8920 s.readObject(); 8921 } 8922 } 8923 } catch (java.io.OptionalDataException e) { 8924 // JDK 1.1/1.2 instances will not have this optional data. 8925 // e.eof will be true to indicate that there is no more 8926 // data available for this object. 8927 // If e.eof is not true, throw the exception as it 8928 // might have been caused by reasons unrelated to 8929 // hierarchy and hierarchyBounds listeners. 8930 8931 if (!e.eof) { 8932 throw (e); 8933 } 8934 } 8935 8936 try { 8937 while (null != (keyOrNull = s.readObject())) { 8938 String key = ((String)keyOrNull).intern(); 8939 8940 if (mouseWheelListenerK == key) { 8941 addMouseWheelListener((MouseWheelListener)(s.readObject())); 8942 } 8943 else { 8944 // skip value for unrecognized key 8945 s.readObject(); 8946 } 8947 } 8948 } catch (java.io.OptionalDataException e) { 8949 // pre-1.3 instances will not have this optional data. 8950 // e.eof will be true to indicate that there is no more 8951 // data available for this object. 8952 // If e.eof is not true, throw the exception as it 8953 // might have been caused by reasons unrelated to 8954 // mouse wheel listeners 8955 8956 if (!e.eof) { 8957 throw (e); 8958 } 8959 } 8960 8961 if (popups != null) { 8962 int npopups = popups.size(); 8963 for (int i = 0 ; i < npopups ; i++) { 8964 PopupMenu popup = popups.elementAt(i); 8965 popup.parent = this; 8966 } 8967 } 8968 } 8969 8970 /** 8971 * Sets the language-sensitive orientation that is to be used to order 8972 * the elements or text within this component. Language-sensitive 8973 * <code>LayoutManager</code> and <code>Component</code> 8974 * subclasses will use this property to 8975 * determine how to lay out and draw components. 8976 * <p> 8977 * At construction time, a component's orientation is set to 8978 * <code>ComponentOrientation.UNKNOWN</code>, 8979 * indicating that it has not been specified 8980 * explicitly. The UNKNOWN orientation behaves the same as 8981 * <code>ComponentOrientation.LEFT_TO_RIGHT</code>. 8982 * <p> 8983 * To set the orientation of a single component, use this method. 8984 * To set the orientation of an entire component 8985 * hierarchy, use 8986 * {@link #applyComponentOrientation applyComponentOrientation}. 8987 * <p> 8988 * This method changes layout-related information, and therefore, 8989 * invalidates the component hierarchy. 8990 * 8991 * @param o the orientation to be set 8992 * 8993 * @see ComponentOrientation 8994 * @see #invalidate 8995 * 8996 * @author Laura Werner, IBM 8997 * @beaninfo 8998 * bound: true 8999 */ 9000 public void setComponentOrientation(ComponentOrientation o) { 9001 ComponentOrientation oldValue = componentOrientation; 9002 componentOrientation = o; 9003 9004 // This is a bound property, so report the change to 9005 // any registered listeners. (Cheap if there are none.) 9006 firePropertyChange("componentOrientation", oldValue, o); 9007 9008 // This could change the preferred size of the Component. 9009 invalidateIfValid(); 9010 } 9011 9012 /** 9013 * Retrieves the language-sensitive orientation that is to be used to order 9014 * the elements or text within this component. <code>LayoutManager</code> 9015 * and <code>Component</code> 9016 * subclasses that wish to respect orientation should call this method to 9017 * get the component's orientation before performing layout or drawing. 9018 * 9019 * @return the orientation to order the elements or text 9020 * @see ComponentOrientation 9021 * 9022 * @author Laura Werner, IBM 9023 */ 9024 public ComponentOrientation getComponentOrientation() { 9025 return componentOrientation; 9026 } 9027 9028 /** 9029 * Sets the <code>ComponentOrientation</code> property of this component 9030 * and all components contained within it. 9031 * <p> 9032 * This method changes layout-related information, and therefore, 9033 * invalidates the component hierarchy. 9034 * 9035 * 9036 * @param orientation the new component orientation of this component and 9037 * the components contained within it. 9038 * @exception NullPointerException if <code>orientation</code> is null. 9039 * @see #setComponentOrientation 9040 * @see #getComponentOrientation 9041 * @see #invalidate 9042 * @since 1.4 9043 */ 9044 public void applyComponentOrientation(ComponentOrientation orientation) { 9045 if (orientation == null) { 9046 throw new NullPointerException(); 9047 } 9048 setComponentOrientation(orientation); 9049 } 9050 9051 final boolean canBeFocusOwner() { 9052 // It is enabled, visible, focusable. 9053 if (isEnabled() && isDisplayable() && isVisible() && isFocusable()) { 9054 return true; 9055 } 9056 return false; 9057 } 9058 9059 /** 9060 * Checks that this component meets the prerequisites to be focus owner: 9061 * - it is enabled, visible, focusable 9062 * - it's parents are all enabled and showing 9063 * - top-level window is focusable 9064 * - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts 9065 * this component as focus owner 9066 * @since 1.5 9067 */ 9068 final boolean canBeFocusOwnerRecursively() { 9069 // - it is enabled, visible, focusable 9070 if (!canBeFocusOwner()) { 9071 return false; 9072 } 9073 9074 // - it's parents are all enabled and showing 9075 synchronized(getTreeLock()) { 9076 if (parent != null) { 9077 return parent.canContainFocusOwner(this); 9078 } 9079 } 9080 return true; 9081 } 9082 9083 /** 9084 * Fix the location of the HW component in a LW container hierarchy. 9085 */ 9086 final void relocateComponent() { 9087 synchronized (getTreeLock()) { 9088 if (peer == null) { 9089 return; 9090 } 9091 int nativeX = x; 9092 int nativeY = y; 9093 for (Component cont = getContainer(); 9094 cont != null && cont.isLightweight(); 9095 cont = cont.getContainer()) 9096 { 9097 nativeX += cont.x; 9098 nativeY += cont.y; 9099 } 9100 peer.setBounds(nativeX, nativeY, width, height, 9101 ComponentPeer.SET_LOCATION); 9102 } 9103 } 9104 9105 /** 9106 * Returns the <code>Window</code> ancestor of the component. 9107 * @return Window ancestor of the component or component by itself if it is Window; 9108 * null, if component is not a part of window hierarchy 9109 */ 9110 Window getContainingWindow() { 9111 return SunToolkit.getContainingWindow(this); 9112 } 9113 9114 /** 9115 * Initialize JNI field and method IDs 9116 */ 9117 private static native void initIDs(); 9118 9119 /* 9120 * --- Accessibility Support --- 9121 * 9122 * Component will contain all of the methods in interface Accessible, 9123 * though it won't actually implement the interface - that will be up 9124 * to the individual objects which extend Component. 9125 */ 9126 9127 /** 9128 * The {@code AccessibleContext} associated with this {@code Component}. 9129 */ 9130 protected AccessibleContext accessibleContext = null; 9131 9132 /** 9133 * Gets the <code>AccessibleContext</code> associated 9134 * with this <code>Component</code>. 9135 * The method implemented by this base 9136 * class returns null. Classes that extend <code>Component</code> 9137 * should implement this method to return the 9138 * <code>AccessibleContext</code> associated with the subclass. 9139 * 9140 * 9141 * @return the <code>AccessibleContext</code> of this 9142 * <code>Component</code> 9143 * @since 1.3 9144 */ 9145 public AccessibleContext getAccessibleContext() { 9146 return accessibleContext; 9147 } 9148 9149 /** 9150 * Inner class of Component used to provide default support for 9151 * accessibility. This class is not meant to be used directly by 9152 * application developers, but is instead meant only to be 9153 * subclassed by component developers. 9154 * <p> 9155 * The class used to obtain the accessible role for this object. 9156 * @since 1.3 9157 */ 9158 protected abstract class AccessibleAWTComponent extends AccessibleContext 9159 implements Serializable, AccessibleComponent { 9160 9161 private static final long serialVersionUID = 642321655757800191L; 9162 9163 /** 9164 * Though the class is abstract, this should be called by 9165 * all sub-classes. 9166 */ 9167 protected AccessibleAWTComponent() { 9168 } 9169 9170 /** 9171 * Number of PropertyChangeListener objects registered. It's used 9172 * to add/remove ComponentListener and FocusListener to track 9173 * target Component's state. 9174 */ 9175 private volatile transient int propertyListenersCount = 0; 9176 9177 /** 9178 * A component listener to track show/hide/resize events 9179 * and convert them to PropertyChange events. 9180 */ 9181 protected ComponentListener accessibleAWTComponentHandler = null; 9182 9183 /** 9184 * A listener to track focus events 9185 * and convert them to PropertyChange events. 9186 */ 9187 protected FocusListener accessibleAWTFocusHandler = null; 9188 9189 /** 9190 * Fire PropertyChange listener, if one is registered, 9191 * when shown/hidden.. 9192 * @since 1.3 9193 */ 9194 protected class AccessibleAWTComponentHandler implements ComponentListener { 9195 public void componentHidden(ComponentEvent e) { 9196 if (accessibleContext != null) { 9197 accessibleContext.firePropertyChange( 9198 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9199 AccessibleState.VISIBLE, null); 9200 } 9201 } 9202 9203 public void componentShown(ComponentEvent e) { 9204 if (accessibleContext != null) { 9205 accessibleContext.firePropertyChange( 9206 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9207 null, AccessibleState.VISIBLE); 9208 } 9209 } 9210 9211 public void componentMoved(ComponentEvent e) { 9212 } 9213 9214 public void componentResized(ComponentEvent e) { 9215 } 9216 } // inner class AccessibleAWTComponentHandler 9217 9218 9219 /** 9220 * Fire PropertyChange listener, if one is registered, 9221 * when focus events happen 9222 * @since 1.3 9223 */ 9224 protected class AccessibleAWTFocusHandler implements FocusListener { 9225 public void focusGained(FocusEvent event) { 9226 if (accessibleContext != null) { 9227 accessibleContext.firePropertyChange( 9228 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9229 null, AccessibleState.FOCUSED); 9230 } 9231 } 9232 public void focusLost(FocusEvent event) { 9233 if (accessibleContext != null) { 9234 accessibleContext.firePropertyChange( 9235 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9236 AccessibleState.FOCUSED, null); 9237 } 9238 } 9239 } // inner class AccessibleAWTFocusHandler 9240 9241 9242 /** 9243 * Adds a <code>PropertyChangeListener</code> to the listener list. 9244 * 9245 * @param listener the property change listener to be added 9246 */ 9247 public void addPropertyChangeListener(PropertyChangeListener listener) { 9248 if (accessibleAWTComponentHandler == null) { 9249 accessibleAWTComponentHandler = new AccessibleAWTComponentHandler(); 9250 } 9251 if (accessibleAWTFocusHandler == null) { 9252 accessibleAWTFocusHandler = new AccessibleAWTFocusHandler(); 9253 } 9254 if (propertyListenersCount++ == 0) { 9255 Component.this.addComponentListener(accessibleAWTComponentHandler); 9256 Component.this.addFocusListener(accessibleAWTFocusHandler); 9257 } 9258 super.addPropertyChangeListener(listener); 9259 } 9260 9261 /** 9262 * Remove a PropertyChangeListener from the listener list. 9263 * This removes a PropertyChangeListener that was registered 9264 * for all properties. 9265 * 9266 * @param listener The PropertyChangeListener to be removed 9267 */ 9268 public void removePropertyChangeListener(PropertyChangeListener listener) { 9269 if (--propertyListenersCount == 0) { 9270 Component.this.removeComponentListener(accessibleAWTComponentHandler); 9271 Component.this.removeFocusListener(accessibleAWTFocusHandler); 9272 } 9273 super.removePropertyChangeListener(listener); 9274 } 9275 9276 // AccessibleContext methods 9277 // 9278 /** 9279 * Gets the accessible name of this object. This should almost never 9280 * return <code>java.awt.Component.getName()</code>, 9281 * as that generally isn't a localized name, 9282 * and doesn't have meaning for the user. If the 9283 * object is fundamentally a text object (e.g. a menu item), the 9284 * accessible name should be the text of the object (e.g. "save"). 9285 * If the object has a tooltip, the tooltip text may also be an 9286 * appropriate String to return. 9287 * 9288 * @return the localized name of the object -- can be 9289 * <code>null</code> if this 9290 * object does not have a name 9291 * @see javax.accessibility.AccessibleContext#setAccessibleName 9292 */ 9293 public String getAccessibleName() { 9294 return accessibleName; 9295 } 9296 9297 /** 9298 * Gets the accessible description of this object. This should be 9299 * a concise, localized description of what this object is - what 9300 * is its meaning to the user. If the object has a tooltip, the 9301 * tooltip text may be an appropriate string to return, assuming 9302 * it contains a concise description of the object (instead of just 9303 * the name of the object - e.g. a "Save" icon on a toolbar that 9304 * had "save" as the tooltip text shouldn't return the tooltip 9305 * text as the description, but something like "Saves the current 9306 * text document" instead). 9307 * 9308 * @return the localized description of the object -- can be 9309 * <code>null</code> if this object does not have a description 9310 * @see javax.accessibility.AccessibleContext#setAccessibleDescription 9311 */ 9312 public String getAccessibleDescription() { 9313 return accessibleDescription; 9314 } 9315 9316 /** 9317 * Gets the role of this object. 9318 * 9319 * @return an instance of <code>AccessibleRole</code> 9320 * describing the role of the object 9321 * @see javax.accessibility.AccessibleRole 9322 */ 9323 public AccessibleRole getAccessibleRole() { 9324 return AccessibleRole.AWT_COMPONENT; 9325 } 9326 9327 /** 9328 * Gets the state of this object. 9329 * 9330 * @return an instance of <code>AccessibleStateSet</code> 9331 * containing the current state set of the object 9332 * @see javax.accessibility.AccessibleState 9333 */ 9334 public AccessibleStateSet getAccessibleStateSet() { 9335 return Component.this.getAccessibleStateSet(); 9336 } 9337 9338 /** 9339 * Gets the <code>Accessible</code> parent of this object. 9340 * If the parent of this object implements <code>Accessible</code>, 9341 * this method should simply return <code>getParent</code>. 9342 * 9343 * @return the <code>Accessible</code> parent of this 9344 * object -- can be <code>null</code> if this 9345 * object does not have an <code>Accessible</code> parent 9346 */ 9347 public Accessible getAccessibleParent() { 9348 if (accessibleParent != null) { 9349 return accessibleParent; 9350 } else { 9351 Container parent = getParent(); 9352 if (parent instanceof Accessible) { 9353 return (Accessible) parent; 9354 } 9355 } 9356 return null; 9357 } 9358 9359 /** 9360 * Gets the index of this object in its accessible parent. 9361 * 9362 * @return the index of this object in its parent; or -1 if this 9363 * object does not have an accessible parent 9364 * @see #getAccessibleParent 9365 */ 9366 public int getAccessibleIndexInParent() { 9367 return Component.this.getAccessibleIndexInParent(); 9368 } 9369 9370 /** 9371 * Returns the number of accessible children in the object. If all 9372 * of the children of this object implement <code>Accessible</code>, 9373 * then this method should return the number of children of this object. 9374 * 9375 * @return the number of accessible children in the object 9376 */ 9377 public int getAccessibleChildrenCount() { 9378 return 0; // Components don't have children 9379 } 9380 9381 /** 9382 * Returns the nth <code>Accessible</code> child of the object. 9383 * 9384 * @param i zero-based index of child 9385 * @return the nth <code>Accessible</code> child of the object 9386 */ 9387 public Accessible getAccessibleChild(int i) { 9388 return null; // Components don't have children 9389 } 9390 9391 /** 9392 * Returns the locale of this object. 9393 * 9394 * @return the locale of this object 9395 */ 9396 public Locale getLocale() { 9397 return Component.this.getLocale(); 9398 } 9399 9400 /** 9401 * Gets the <code>AccessibleComponent</code> associated 9402 * with this object if one exists. 9403 * Otherwise return <code>null</code>. 9404 * 9405 * @return the component 9406 */ 9407 public AccessibleComponent getAccessibleComponent() { 9408 return this; 9409 } 9410 9411 9412 // AccessibleComponent methods 9413 // 9414 /** 9415 * Gets the background color of this object. 9416 * 9417 * @return the background color, if supported, of the object; 9418 * otherwise, <code>null</code> 9419 */ 9420 public Color getBackground() { 9421 return Component.this.getBackground(); 9422 } 9423 9424 /** 9425 * Sets the background color of this object. 9426 * (For transparency, see <code>isOpaque</code>.) 9427 * 9428 * @param c the new <code>Color</code> for the background 9429 * @see Component#isOpaque 9430 */ 9431 public void setBackground(Color c) { 9432 Component.this.setBackground(c); 9433 } 9434 9435 /** 9436 * Gets the foreground color of this object. 9437 * 9438 * @return the foreground color, if supported, of the object; 9439 * otherwise, <code>null</code> 9440 */ 9441 public Color getForeground() { 9442 return Component.this.getForeground(); 9443 } 9444 9445 /** 9446 * Sets the foreground color of this object. 9447 * 9448 * @param c the new <code>Color</code> for the foreground 9449 */ 9450 public void setForeground(Color c) { 9451 Component.this.setForeground(c); 9452 } 9453 9454 /** 9455 * Gets the <code>Cursor</code> of this object. 9456 * 9457 * @return the <code>Cursor</code>, if supported, 9458 * of the object; otherwise, <code>null</code> 9459 */ 9460 public Cursor getCursor() { 9461 return Component.this.getCursor(); 9462 } 9463 9464 /** 9465 * Sets the <code>Cursor</code> of this object. 9466 * <p> 9467 * The method may have no visual effect if the Java platform 9468 * implementation and/or the native system do not support 9469 * changing the mouse cursor shape. 9470 * @param cursor the new <code>Cursor</code> for the object 9471 */ 9472 public void setCursor(Cursor cursor) { 9473 Component.this.setCursor(cursor); 9474 } 9475 9476 /** 9477 * Gets the <code>Font</code> of this object. 9478 * 9479 * @return the <code>Font</code>, if supported, 9480 * for the object; otherwise, <code>null</code> 9481 */ 9482 public Font getFont() { 9483 return Component.this.getFont(); 9484 } 9485 9486 /** 9487 * Sets the <code>Font</code> of this object. 9488 * 9489 * @param f the new <code>Font</code> for the object 9490 */ 9491 public void setFont(Font f) { 9492 Component.this.setFont(f); 9493 } 9494 9495 /** 9496 * Gets the <code>FontMetrics</code> of this object. 9497 * 9498 * @param f the <code>Font</code> 9499 * @return the <code>FontMetrics</code>, if supported, 9500 * the object; otherwise, <code>null</code> 9501 * @see #getFont 9502 */ 9503 public FontMetrics getFontMetrics(Font f) { 9504 if (f == null) { 9505 return null; 9506 } else { 9507 return Component.this.getFontMetrics(f); 9508 } 9509 } 9510 9511 /** 9512 * Determines if the object is enabled. 9513 * 9514 * @return true if object is enabled; otherwise, false 9515 */ 9516 public boolean isEnabled() { 9517 return Component.this.isEnabled(); 9518 } 9519 9520 /** 9521 * Sets the enabled state of the object. 9522 * 9523 * @param b if true, enables this object; otherwise, disables it 9524 */ 9525 public void setEnabled(boolean b) { 9526 boolean old = Component.this.isEnabled(); 9527 Component.this.setEnabled(b); 9528 if (b != old) { 9529 if (accessibleContext != null) { 9530 if (b) { 9531 accessibleContext.firePropertyChange( 9532 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9533 null, AccessibleState.ENABLED); 9534 } else { 9535 accessibleContext.firePropertyChange( 9536 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9537 AccessibleState.ENABLED, null); 9538 } 9539 } 9540 } 9541 } 9542 9543 /** 9544 * Determines if the object is visible. Note: this means that the 9545 * object intends to be visible; however, it may not in fact be 9546 * showing on the screen because one of the objects that this object 9547 * is contained by is not visible. To determine if an object is 9548 * showing on the screen, use <code>isShowing</code>. 9549 * 9550 * @return true if object is visible; otherwise, false 9551 */ 9552 public boolean isVisible() { 9553 return Component.this.isVisible(); 9554 } 9555 9556 /** 9557 * Sets the visible state of the object. 9558 * 9559 * @param b if true, shows this object; otherwise, hides it 9560 */ 9561 public void setVisible(boolean b) { 9562 boolean old = Component.this.isVisible(); 9563 Component.this.setVisible(b); 9564 if (b != old) { 9565 if (accessibleContext != null) { 9566 if (b) { 9567 accessibleContext.firePropertyChange( 9568 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9569 null, AccessibleState.VISIBLE); 9570 } else { 9571 accessibleContext.firePropertyChange( 9572 AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 9573 AccessibleState.VISIBLE, null); 9574 } 9575 } 9576 } 9577 } 9578 9579 /** 9580 * Determines if the object is showing. This is determined by checking 9581 * the visibility of the object and ancestors of the object. Note: 9582 * this will return true even if the object is obscured by another 9583 * (for example, it happens to be underneath a menu that was pulled 9584 * down). 9585 * 9586 * @return true if object is showing; otherwise, false 9587 */ 9588 public boolean isShowing() { 9589 return Component.this.isShowing(); 9590 } 9591 9592 /** 9593 * Checks whether the specified point is within this object's bounds, 9594 * where the point's x and y coordinates are defined to be relative to 9595 * the coordinate system of the object. 9596 * 9597 * @param p the <code>Point</code> relative to the 9598 * coordinate system of the object 9599 * @return true if object contains <code>Point</code>; otherwise false 9600 */ 9601 public boolean contains(Point p) { 9602 return Component.this.contains(p); 9603 } 9604 9605 /** 9606 * Returns the location of the object on the screen. 9607 * 9608 * @return location of object on screen -- can be 9609 * <code>null</code> if this object is not on the screen 9610 */ 9611 public Point getLocationOnScreen() { 9612 synchronized (Component.this.getTreeLock()) { 9613 if (Component.this.isShowing()) { 9614 return Component.this.getLocationOnScreen(); 9615 } else { 9616 return null; 9617 } 9618 } 9619 } 9620 9621 /** 9622 * Gets the location of the object relative to the parent in the form 9623 * of a point specifying the object's top-left corner in the screen's 9624 * coordinate space. 9625 * 9626 * @return an instance of Point representing the top-left corner of 9627 * the object's bounds in the coordinate space of the screen; 9628 * <code>null</code> if this object or its parent are not on the screen 9629 */ 9630 public Point getLocation() { 9631 return Component.this.getLocation(); 9632 } 9633 9634 /** 9635 * Sets the location of the object relative to the parent. 9636 * @param p the coordinates of the object 9637 */ 9638 public void setLocation(Point p) { 9639 Component.this.setLocation(p); 9640 } 9641 9642 /** 9643 * Gets the bounds of this object in the form of a Rectangle object. 9644 * The bounds specify this object's width, height, and location 9645 * relative to its parent. 9646 * 9647 * @return a rectangle indicating this component's bounds; 9648 * <code>null</code> if this object is not on the screen 9649 */ 9650 public Rectangle getBounds() { 9651 return Component.this.getBounds(); 9652 } 9653 9654 /** 9655 * Sets the bounds of this object in the form of a 9656 * <code>Rectangle</code> object. 9657 * The bounds specify this object's width, height, and location 9658 * relative to its parent. 9659 * 9660 * @param r a rectangle indicating this component's bounds 9661 */ 9662 public void setBounds(Rectangle r) { 9663 Component.this.setBounds(r); 9664 } 9665 9666 /** 9667 * Returns the size of this object in the form of a 9668 * <code>Dimension</code> object. The height field of the 9669 * <code>Dimension</code> object contains this object's 9670 * height, and the width field of the <code>Dimension</code> 9671 * object contains this object's width. 9672 * 9673 * @return a <code>Dimension</code> object that indicates 9674 * the size of this component; <code>null</code> if 9675 * this object is not on the screen 9676 */ 9677 public Dimension getSize() { 9678 return Component.this.getSize(); 9679 } 9680 9681 /** 9682 * Resizes this object so that it has width and height. 9683 * 9684 * @param d - the dimension specifying the new size of the object 9685 */ 9686 public void setSize(Dimension d) { 9687 Component.this.setSize(d); 9688 } 9689 9690 /** 9691 * Returns the <code>Accessible</code> child, 9692 * if one exists, contained at the local 9693 * coordinate <code>Point</code>. Otherwise returns 9694 * <code>null</code>. 9695 * 9696 * @param p the point defining the top-left corner of 9697 * the <code>Accessible</code>, given in the 9698 * coordinate space of the object's parent 9699 * @return the <code>Accessible</code>, if it exists, 9700 * at the specified location; else <code>null</code> 9701 */ 9702 public Accessible getAccessibleAt(Point p) { 9703 return null; // Components don't have children 9704 } 9705 9706 /** 9707 * Returns whether this object can accept focus or not. 9708 * 9709 * @return true if object can accept focus; otherwise false 9710 */ 9711 public boolean isFocusTraversable() { 9712 return Component.this.isFocusTraversable(); 9713 } 9714 9715 /** 9716 * Requests focus for this object. 9717 */ 9718 public void requestFocus() { 9719 Component.this.requestFocus(); 9720 } 9721 9722 /** 9723 * Adds the specified focus listener to receive focus events from this 9724 * component. 9725 * 9726 * @param l the focus listener 9727 */ 9728 public void addFocusListener(FocusListener l) { 9729 Component.this.addFocusListener(l); 9730 } 9731 9732 /** 9733 * Removes the specified focus listener so it no longer receives focus 9734 * events from this component. 9735 * 9736 * @param l the focus listener 9737 */ 9738 public void removeFocusListener(FocusListener l) { 9739 Component.this.removeFocusListener(l); 9740 } 9741 9742 } // inner class AccessibleAWTComponent 9743 9744 9745 /** 9746 * Gets the index of this object in its accessible parent. 9747 * If this object does not have an accessible parent, returns 9748 * -1. 9749 * 9750 * @return the index of this object in its accessible parent 9751 */ 9752 int getAccessibleIndexInParent() { 9753 synchronized (getTreeLock()) { 9754 int index = -1; 9755 Container parent = this.getParent(); 9756 if (parent != null && parent instanceof Accessible) { 9757 Component ca[] = parent.getComponents(); 9758 for (int i = 0; i < ca.length; i++) { 9759 if (ca[i] instanceof Accessible) { 9760 index++; 9761 } 9762 if (this.equals(ca[i])) { 9763 return index; 9764 } 9765 } 9766 } 9767 return -1; 9768 } 9769 } 9770 9771 /** 9772 * Gets the current state set of this object. 9773 * 9774 * @return an instance of <code>AccessibleStateSet</code> 9775 * containing the current state set of the object 9776 * @see AccessibleState 9777 */ 9778 AccessibleStateSet getAccessibleStateSet() { 9779 synchronized (getTreeLock()) { 9780 AccessibleStateSet states = new AccessibleStateSet(); 9781 if (this.isEnabled()) { 9782 states.add(AccessibleState.ENABLED); 9783 } 9784 if (this.isFocusTraversable()) { 9785 states.add(AccessibleState.FOCUSABLE); 9786 } 9787 if (this.isVisible()) { 9788 states.add(AccessibleState.VISIBLE); 9789 } 9790 if (this.isShowing()) { 9791 states.add(AccessibleState.SHOWING); 9792 } 9793 if (this.isFocusOwner()) { 9794 states.add(AccessibleState.FOCUSED); 9795 } 9796 if (this instanceof Accessible) { 9797 AccessibleContext ac = ((Accessible) this).getAccessibleContext(); 9798 if (ac != null) { 9799 Accessible ap = ac.getAccessibleParent(); 9800 if (ap != null) { 9801 AccessibleContext pac = ap.getAccessibleContext(); 9802 if (pac != null) { 9803 AccessibleSelection as = pac.getAccessibleSelection(); 9804 if (as != null) { 9805 states.add(AccessibleState.SELECTABLE); 9806 int i = ac.getAccessibleIndexInParent(); 9807 if (i >= 0) { 9808 if (as.isAccessibleChildSelected(i)) { 9809 states.add(AccessibleState.SELECTED); 9810 } 9811 } 9812 } 9813 } 9814 } 9815 } 9816 } 9817 if (Component.isInstanceOf(this, "javax.swing.JComponent")) { 9818 if (((javax.swing.JComponent) this).isOpaque()) { 9819 states.add(AccessibleState.OPAQUE); 9820 } 9821 } 9822 return states; 9823 } 9824 } 9825 9826 /** 9827 * Checks that the given object is instance of the given class. 9828 * @param obj Object to be checked 9829 * @param className The name of the class. Must be fully-qualified class name. 9830 * @return true, if this object is instanceof given class, 9831 * false, otherwise, or if obj or className is null 9832 */ 9833 static boolean isInstanceOf(Object obj, String className) { 9834 if (obj == null) return false; 9835 if (className == null) return false; 9836 9837 Class<?> cls = obj.getClass(); 9838 while (cls != null) { 9839 if (cls.getName().equals(className)) { 9840 return true; 9841 } 9842 cls = cls.getSuperclass(); 9843 } 9844 return false; 9845 } 9846 9847 9848 // ************************** MIXING CODE ******************************* 9849 9850 /** 9851 * Check whether we can trust the current bounds of the component. 9852 * The return value of false indicates that the container of the 9853 * component is invalid, and therefore needs to be laid out, which would 9854 * probably mean changing the bounds of its children. 9855 * Null-layout of the container or absence of the container mean 9856 * the bounds of the component are final and can be trusted. 9857 */ 9858 final boolean areBoundsValid() { 9859 Container cont = getContainer(); 9860 return cont == null || cont.isValid() || cont.getLayout() == null; 9861 } 9862 9863 /** 9864 * Applies the shape to the component 9865 * @param shape Shape to be applied to the component 9866 */ 9867 void applyCompoundShape(Region shape) { 9868 checkTreeLock(); 9869 9870 if (!areBoundsValid()) { 9871 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 9872 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid()); 9873 } 9874 return; 9875 } 9876 9877 if (!isLightweight()) { 9878 ComponentPeer peer = this.peer; 9879 if (peer != null) { 9880 // The Region class has some optimizations. That's why 9881 // we should manually check whether it's empty and 9882 // substitute the object ourselves. Otherwise we end up 9883 // with some incorrect Region object with loX being 9884 // greater than the hiX for instance. 9885 if (shape.isEmpty()) { 9886 shape = Region.EMPTY_REGION; 9887 } 9888 9889 9890 // Note: the shape is not really copied/cloned. We create 9891 // the Region object ourselves, so there's no any possibility 9892 // to modify the object outside of the mixing code. 9893 // Nullifying compoundShape means that the component has normal shape 9894 // (or has no shape at all). 9895 if (shape.equals(getNormalShape())) { 9896 if (this.compoundShape == null) { 9897 return; 9898 } 9899 this.compoundShape = null; 9900 peer.applyShape(null); 9901 } else { 9902 if (shape.equals(getAppliedShape())) { 9903 return; 9904 } 9905 this.compoundShape = shape; 9906 Point compAbsolute = getLocationOnWindow(); 9907 if (mixingLog.isLoggable(PlatformLogger.Level.FINER)) { 9908 mixingLog.fine("this = " + this + 9909 "; compAbsolute=" + compAbsolute + "; shape=" + shape); 9910 } 9911 peer.applyShape(shape.getTranslatedRegion(-compAbsolute.x, -compAbsolute.y)); 9912 } 9913 } 9914 } 9915 } 9916 9917 /** 9918 * Returns the shape previously set with applyCompoundShape(). 9919 * If the component is LW or no shape was applied yet, 9920 * the method returns the normal shape. 9921 */ 9922 private Region getAppliedShape() { 9923 checkTreeLock(); 9924 //XXX: if we allow LW components to have a shape, this must be changed 9925 return (this.compoundShape == null || isLightweight()) ? getNormalShape() : this.compoundShape; 9926 } 9927 9928 Point getLocationOnWindow() { 9929 checkTreeLock(); 9930 Point curLocation = getLocation(); 9931 9932 for (Container parent = getContainer(); 9933 parent != null && !(parent instanceof Window); 9934 parent = parent.getContainer()) 9935 { 9936 curLocation.x += parent.getX(); 9937 curLocation.y += parent.getY(); 9938 } 9939 9940 return curLocation; 9941 } 9942 9943 /** 9944 * Returns the full shape of the component located in window coordinates 9945 */ 9946 final Region getNormalShape() { 9947 checkTreeLock(); 9948 //XXX: we may take into account a user-specified shape for this component 9949 Point compAbsolute = getLocationOnWindow(); 9950 return 9951 Region.getInstanceXYWH( 9952 compAbsolute.x, 9953 compAbsolute.y, 9954 getWidth(), 9955 getHeight() 9956 ); 9957 } 9958 9959 /** 9960 * Returns the "opaque shape" of the component. 9961 * 9962 * The opaque shape of a lightweight components is the actual shape that 9963 * needs to be cut off of the heavyweight components in order to mix this 9964 * lightweight component correctly with them. 9965 * 9966 * The method is overriden in the java.awt.Container to handle non-opaque 9967 * containers containing opaque children. 9968 * 9969 * See 6637655 for details. 9970 */ 9971 Region getOpaqueShape() { 9972 checkTreeLock(); 9973 if (mixingCutoutRegion != null) { 9974 return mixingCutoutRegion; 9975 } else { 9976 return getNormalShape(); 9977 } 9978 } 9979 9980 final int getSiblingIndexAbove() { 9981 checkTreeLock(); 9982 Container parent = getContainer(); 9983 if (parent == null) { 9984 return -1; 9985 } 9986 9987 int nextAbove = parent.getComponentZOrder(this) - 1; 9988 9989 return nextAbove < 0 ? -1 : nextAbove; 9990 } 9991 9992 final ComponentPeer getHWPeerAboveMe() { 9993 checkTreeLock(); 9994 9995 Container cont = getContainer(); 9996 int indexAbove = getSiblingIndexAbove(); 9997 9998 while (cont != null) { 9999 for (int i = indexAbove; i > -1; i--) { 10000 Component comp = cont.getComponent(i); 10001 if (comp != null && comp.isDisplayable() && !comp.isLightweight()) { 10002 return comp.peer; 10003 } 10004 } 10005 // traversing the hierarchy up to the closest HW container; 10006 // further traversing may return a component that is not actually 10007 // a native sibling of this component and this kind of z-order 10008 // request may not be allowed by the underlying system (6852051). 10009 if (!cont.isLightweight()) { 10010 break; 10011 } 10012 10013 indexAbove = cont.getSiblingIndexAbove(); 10014 cont = cont.getContainer(); 10015 } 10016 10017 return null; 10018 } 10019 10020 final int getSiblingIndexBelow() { 10021 checkTreeLock(); 10022 Container parent = getContainer(); 10023 if (parent == null) { 10024 return -1; 10025 } 10026 10027 int nextBelow = parent.getComponentZOrder(this) + 1; 10028 10029 return nextBelow >= parent.getComponentCount() ? -1 : nextBelow; 10030 } 10031 10032 final boolean isNonOpaqueForMixing() { 10033 return mixingCutoutRegion != null && 10034 mixingCutoutRegion.isEmpty(); 10035 } 10036 10037 private Region calculateCurrentShape() { 10038 checkTreeLock(); 10039 Region s = getNormalShape(); 10040 10041 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10042 mixingLog.fine("this = " + this + "; normalShape=" + s); 10043 } 10044 10045 if (getContainer() != null) { 10046 Component comp = this; 10047 Container cont = comp.getContainer(); 10048 10049 while (cont != null) { 10050 for (int index = comp.getSiblingIndexAbove(); index != -1; --index) { 10051 /* It is assumed that: 10052 * 10053 * getComponent(getContainer().getComponentZOrder(comp)) == comp 10054 * 10055 * The assumption has been made according to the current 10056 * implementation of the Container class. 10057 */ 10058 Component c = cont.getComponent(index); 10059 if (c.isLightweight() && c.isShowing()) { 10060 s = s.getDifference(c.getOpaqueShape()); 10061 } 10062 } 10063 10064 if (cont.isLightweight()) { 10065 s = s.getIntersection(cont.getNormalShape()); 10066 } else { 10067 break; 10068 } 10069 10070 comp = cont; 10071 cont = cont.getContainer(); 10072 } 10073 } 10074 10075 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10076 mixingLog.fine("currentShape=" + s); 10077 } 10078 10079 return s; 10080 } 10081 10082 void applyCurrentShape() { 10083 checkTreeLock(); 10084 if (!areBoundsValid()) { 10085 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10086 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid()); 10087 } 10088 return; // Because applyCompoundShape() ignores such components anyway 10089 } 10090 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10091 mixingLog.fine("this = " + this); 10092 } 10093 applyCompoundShape(calculateCurrentShape()); 10094 } 10095 10096 final void subtractAndApplyShape(Region s) { 10097 checkTreeLock(); 10098 10099 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10100 mixingLog.fine("this = " + this + "; s=" + s); 10101 } 10102 10103 applyCompoundShape(getAppliedShape().getDifference(s)); 10104 } 10105 10106 private final void applyCurrentShapeBelowMe() { 10107 checkTreeLock(); 10108 Container parent = getContainer(); 10109 if (parent != null && parent.isShowing()) { 10110 // First, reapply shapes of my siblings 10111 parent.recursiveApplyCurrentShape(getSiblingIndexBelow()); 10112 10113 // Second, if my container is non-opaque, reapply shapes of siblings of my container 10114 Container parent2 = parent.getContainer(); 10115 while (!parent.isOpaque() && parent2 != null) { 10116 parent2.recursiveApplyCurrentShape(parent.getSiblingIndexBelow()); 10117 10118 parent = parent2; 10119 parent2 = parent.getContainer(); 10120 } 10121 } 10122 } 10123 10124 final void subtractAndApplyShapeBelowMe() { 10125 checkTreeLock(); 10126 Container parent = getContainer(); 10127 if (parent != null && isShowing()) { 10128 Region opaqueShape = getOpaqueShape(); 10129 10130 // First, cut my siblings 10131 parent.recursiveSubtractAndApplyShape(opaqueShape, getSiblingIndexBelow()); 10132 10133 // Second, if my container is non-opaque, cut siblings of my container 10134 Container parent2 = parent.getContainer(); 10135 while (!parent.isOpaque() && parent2 != null) { 10136 parent2.recursiveSubtractAndApplyShape(opaqueShape, parent.getSiblingIndexBelow()); 10137 10138 parent = parent2; 10139 parent2 = parent.getContainer(); 10140 } 10141 } 10142 } 10143 10144 void mixOnShowing() { 10145 synchronized (getTreeLock()) { 10146 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10147 mixingLog.fine("this = " + this); 10148 } 10149 if (!isMixingNeeded()) { 10150 return; 10151 } 10152 if (isLightweight()) { 10153 subtractAndApplyShapeBelowMe(); 10154 } else { 10155 applyCurrentShape(); 10156 } 10157 } 10158 } 10159 10160 void mixOnHiding(boolean isLightweight) { 10161 // We cannot be sure that the peer exists at this point, so we need the argument 10162 // to find out whether the hiding component is (well, actually was) a LW or a HW. 10163 synchronized (getTreeLock()) { 10164 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10165 mixingLog.fine("this = " + this + "; isLightweight = " + isLightweight); 10166 } 10167 if (!isMixingNeeded()) { 10168 return; 10169 } 10170 if (isLightweight) { 10171 applyCurrentShapeBelowMe(); 10172 } 10173 } 10174 } 10175 10176 void mixOnReshaping() { 10177 synchronized (getTreeLock()) { 10178 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10179 mixingLog.fine("this = " + this); 10180 } 10181 if (!isMixingNeeded()) { 10182 return; 10183 } 10184 if (isLightweight()) { 10185 applyCurrentShapeBelowMe(); 10186 } else { 10187 applyCurrentShape(); 10188 } 10189 } 10190 } 10191 10192 void mixOnZOrderChanging(int oldZorder, int newZorder) { 10193 synchronized (getTreeLock()) { 10194 boolean becameHigher = newZorder < oldZorder; 10195 Container parent = getContainer(); 10196 10197 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10198 mixingLog.fine("this = " + this + 10199 "; oldZorder=" + oldZorder + "; newZorder=" + newZorder + "; parent=" + parent); 10200 } 10201 if (!isMixingNeeded()) { 10202 return; 10203 } 10204 if (isLightweight()) { 10205 if (becameHigher) { 10206 if (parent != null && isShowing()) { 10207 parent.recursiveSubtractAndApplyShape(getOpaqueShape(), getSiblingIndexBelow(), oldZorder); 10208 } 10209 } else { 10210 if (parent != null) { 10211 parent.recursiveApplyCurrentShape(oldZorder, newZorder); 10212 } 10213 } 10214 } else { 10215 if (becameHigher) { 10216 applyCurrentShape(); 10217 } else { 10218 if (parent != null) { 10219 Region shape = getAppliedShape(); 10220 10221 for (int index = oldZorder; index < newZorder; index++) { 10222 Component c = parent.getComponent(index); 10223 if (c.isLightweight() && c.isShowing()) { 10224 shape = shape.getDifference(c.getOpaqueShape()); 10225 } 10226 } 10227 applyCompoundShape(shape); 10228 } 10229 } 10230 } 10231 } 10232 } 10233 10234 void mixOnValidating() { 10235 // This method gets overriden in the Container. Obviously, a plain 10236 // non-container components don't need to handle validation. 10237 } 10238 10239 final boolean isMixingNeeded() { 10240 if (SunToolkit.getSunAwtDisableMixing()) { 10241 if (mixingLog.isLoggable(PlatformLogger.Level.FINEST)) { 10242 mixingLog.finest("this = " + this + "; Mixing disabled via sun.awt.disableMixing"); 10243 } 10244 return false; 10245 } 10246 if (!areBoundsValid()) { 10247 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10248 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid()); 10249 } 10250 return false; 10251 } 10252 Window window = getContainingWindow(); 10253 if (window != null) { 10254 if (!window.hasHeavyweightDescendants() || !window.hasLightweightDescendants() || window.isDisposing()) { 10255 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10256 mixingLog.fine("containing window = " + window + 10257 "; has h/w descendants = " + window.hasHeavyweightDescendants() + 10258 "; has l/w descendants = " + window.hasLightweightDescendants() + 10259 "; disposing = " + window.isDisposing()); 10260 } 10261 return false; 10262 } 10263 } else { 10264 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) { 10265 mixingLog.fine("this = " + this + "; containing window is null"); 10266 } 10267 return false; 10268 } 10269 return true; 10270 } 10271 10272 // ****************** END OF MIXING CODE ******************************** 10273 10274 // Note that the method is overriden in the Window class, 10275 // a window doesn't need to be updated in the Z-order. 10276 void updateZOrder() { 10277 peer.setZOrder(getHWPeerAboveMe()); 10278 } 10279 10280 }