1 /* 2 * Copyright (c) 1997, 2017, 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 javax.swing; 26 27 import java.awt.*; 28 import java.awt.event.*; 29 30 import java.util.Vector; 31 import java.util.Locale; 32 import java.util.ArrayList; 33 import java.util.Collections; 34 import java.util.List; 35 36 import java.beans.JavaBean; 37 import java.beans.BeanProperty; 38 import java.beans.PropertyChangeEvent; 39 import java.beans.PropertyChangeListener; 40 import java.beans.Transient; 41 42 import javax.swing.event.*; 43 import javax.accessibility.*; 44 import javax.swing.plaf.*; 45 import javax.swing.text.Position; 46 47 import java.io.ObjectOutputStream; 48 import java.io.IOException; 49 import java.io.Serializable; 50 51 import sun.awt.AWTAccessor; 52 import sun.awt.AWTAccessor.MouseEventAccessor; 53 import sun.swing.SwingUtilities2; 54 import sun.swing.SwingUtilities2.Section; 55 import static sun.swing.SwingUtilities2.Section.*; 56 57 /** 58 * A component that displays a list of objects and allows the user to select 59 * one or more items. A separate model, {@code ListModel}, maintains the 60 * contents of the list. 61 * <p> 62 * It's easy to display an array or Vector of objects, using the {@code JList} 63 * constructor that automatically builds a read-only {@code ListModel} instance 64 * for you: 65 * <pre> 66 * {@code 67 * // Create a JList that displays strings from an array 68 * 69 * String[] data = {"one", "two", "three", "four"}; 70 * JList<String> myList = new JList<String>(data); 71 * 72 * // Create a JList that displays the superclasses of JList.class, by 73 * // creating it with a Vector populated with this data 74 * 75 * Vector<Class<?>> superClasses = new Vector<Class<?>>(); 76 * Class<JList> rootClass = javax.swing.JList.class; 77 * for(Class<?> cls = rootClass; cls != null; cls = cls.getSuperclass()) { 78 * superClasses.addElement(cls); 79 * } 80 * JList<Class<?>> myList = new JList<Class<?>>(superClasses); 81 * 82 * // The automatically created model is stored in JList's "model" 83 * // property, which you can retrieve 84 * 85 * ListModel<Class<?>> model = myList.getModel(); 86 * for(int i = 0; i < model.getSize(); i++) { 87 * System.out.println(model.getElementAt(i)); 88 * } 89 * } 90 * </pre> 91 * <p> 92 * A {@code ListModel} can be supplied directly to a {@code JList} by way of a 93 * constructor or the {@code setModel} method. The contents need not be static - 94 * the number of items, and the values of items can change over time. A correct 95 * {@code ListModel} implementation notifies the set of 96 * {@code javax.swing.event.ListDataListener}s that have been added to it, each 97 * time a change occurs. These changes are characterized by a 98 * {@code javax.swing.event.ListDataEvent}, which identifies the range of list 99 * indices that have been modified, added, or removed. {@code JList}'s 100 * {@code ListUI} is responsible for keeping the visual representation up to 101 * date with changes, by listening to the model. 102 * <p> 103 * Simple, dynamic-content, {@code JList} applications can use the 104 * {@code DefaultListModel} class to maintain list elements. This class 105 * implements the {@code ListModel} interface and also provides a 106 * <code>java.util.Vector</code>-like API. Applications that need a more 107 * custom <code>ListModel</code> implementation may instead wish to subclass 108 * {@code AbstractListModel}, which provides basic support for managing and 109 * notifying listeners. For example, a read-only implementation of 110 * {@code AbstractListModel}: 111 * <pre> 112 * {@code 113 * // This list model has about 2^16 elements. Enjoy scrolling. 114 * 115 * ListModel<String> bigData = new AbstractListModel<String>() { 116 * public int getSize() { return Short.MAX_VALUE; } 117 * public String getElementAt(int index) { return "Index " + index; } 118 * }; 119 * } 120 * </pre> 121 * <p> 122 * The selection state of a {@code JList} is managed by another separate 123 * model, an instance of {@code ListSelectionModel}. {@code JList} is 124 * initialized with a selection model on construction, and also contains 125 * methods to query or set this selection model. Additionally, {@code JList} 126 * provides convenient methods for easily managing the selection. These methods, 127 * such as {@code setSelectedIndex} and {@code getSelectedValue}, are cover 128 * methods that take care of the details of interacting with the selection 129 * model. By default, {@code JList}'s selection model is configured to allow any 130 * combination of items to be selected at a time; selection mode 131 * {@code MULTIPLE_INTERVAL_SELECTION}. The selection mode can be changed 132 * on the selection model directly, or via {@code JList}'s cover method. 133 * Responsibility for updating the selection model in response to user gestures 134 * lies with the list's {@code ListUI}. 135 * <p> 136 * A correct {@code ListSelectionModel} implementation notifies the set of 137 * {@code javax.swing.event.ListSelectionListener}s that have been added to it 138 * each time a change to the selection occurs. These changes are characterized 139 * by a {@code javax.swing.event.ListSelectionEvent}, which identifies the range 140 * of the selection change. 141 * <p> 142 * The preferred way to listen for changes in list selection is to add 143 * {@code ListSelectionListener}s directly to the {@code JList}. {@code JList} 144 * then takes care of listening to the selection model and notifying your 145 * listeners of change. 146 * <p> 147 * Responsibility for listening to selection changes in order to keep the list's 148 * visual representation up to date lies with the list's {@code ListUI}. 149 * <p> 150 * <a id="renderer"></a> 151 * Painting of cells in a {@code JList} is handled by a delegate called a 152 * cell renderer, installed on the list as the {@code cellRenderer} property. 153 * The renderer provides a {@code java.awt.Component} that is used 154 * like a "rubber stamp" to paint the cells. Each time a cell needs to be 155 * painted, the list's {@code ListUI} asks the cell renderer for the component, 156 * moves it into place, and has it paint the contents of the cell by way of its 157 * {@code paint} method. A default cell renderer, which uses a {@code JLabel} 158 * component to render, is installed by the lists's {@code ListUI}. You can 159 * substitute your own renderer using code like this: 160 * <pre> 161 * {@code 162 * // Display an icon and a string for each object in the list. 163 * 164 * class MyCellRenderer extends JLabel implements ListCellRenderer<Object> { 165 * static final ImageIcon longIcon = new ImageIcon("long.gif"); 166 * static final ImageIcon shortIcon = new ImageIcon("short.gif"); 167 * 168 * // This is the only method defined by ListCellRenderer. 169 * // We just reconfigure the JLabel each time we're called. 170 * 171 * public Component getListCellRendererComponent( 172 * JList<?> list, // the list 173 * Object value, // value to display 174 * int index, // cell index 175 * boolean isSelected, // is the cell selected 176 * boolean cellHasFocus) // does the cell have focus 177 * { 178 * String s = value.toString(); 179 * setText(s); 180 * setIcon((s.length() > 10) ? longIcon : shortIcon); 181 * if (isSelected) { 182 * setBackground(list.getSelectionBackground()); 183 * setForeground(list.getSelectionForeground()); 184 * } else { 185 * setBackground(list.getBackground()); 186 * setForeground(list.getForeground()); 187 * } 188 * setEnabled(list.isEnabled()); 189 * setFont(list.getFont()); 190 * setOpaque(true); 191 * return this; 192 * } 193 * } 194 * 195 * myList.setCellRenderer(new MyCellRenderer()); 196 * } 197 * </pre> 198 * <p> 199 * Another job for the cell renderer is in helping to determine sizing 200 * information for the list. By default, the list's {@code ListUI} determines 201 * the size of cells by asking the cell renderer for its preferred 202 * size for each list item. This can be expensive for large lists of items. 203 * To avoid these calculations, you can set a {@code fixedCellWidth} and 204 * {@code fixedCellHeight} on the list, or have these values calculated 205 * automatically based on a single prototype value: 206 * <a id="prototype_example"></a> 207 * <pre> 208 * {@code 209 * JList<String> bigDataList = new JList<String>(bigData); 210 * 211 * // We don't want the JList implementation to compute the width 212 * // or height of all of the list cells, so we give it a string 213 * // that's as big as we'll need for any cell. It uses this to 214 * // compute values for the fixedCellWidth and fixedCellHeight 215 * // properties. 216 * 217 * bigDataList.setPrototypeCellValue("Index 1234567890"); 218 * } 219 * </pre> 220 * <p> 221 * {@code JList} doesn't implement scrolling directly. To create a list that 222 * scrolls, make it the viewport view of a {@code JScrollPane}. For example: 223 * <pre> 224 * JScrollPane scrollPane = new JScrollPane(myList); 225 * 226 * // Or in two steps: 227 * JScrollPane scrollPane = new JScrollPane(); 228 * scrollPane.getViewport().setView(myList); 229 * </pre> 230 * <p> 231 * {@code JList} doesn't provide any special handling of double or triple 232 * (or N) mouse clicks, but it's easy to add a {@code MouseListener} if you 233 * wish to take action on these events. Use the {@code locationToIndex} 234 * method to determine what cell was clicked. For example: 235 * <pre> 236 * MouseListener mouseListener = new MouseAdapter() { 237 * public void mouseClicked(MouseEvent e) { 238 * if (e.getClickCount() == 2) { 239 * int index = list.locationToIndex(e.getPoint()); 240 * System.out.println("Double clicked on Item " + index); 241 * } 242 * } 243 * }; 244 * list.addMouseListener(mouseListener); 245 * </pre> 246 * <p> 247 * <strong>Warning:</strong> Swing is not thread safe. For more 248 * information see <a 249 * href="package-summary.html#threading">Swing's Threading 250 * Policy</a>. 251 * <p> 252 * <strong>Warning:</strong> 253 * Serialized objects of this class will not be compatible with 254 * future Swing releases. The current serialization support is 255 * appropriate for short term storage or RMI between applications running 256 * the same version of Swing. As of 1.4, support for long term storage 257 * of all JavaBeans™ 258 * has been added to the <code>java.beans</code> package. 259 * Please see {@link java.beans.XMLEncoder}. 260 * <p> 261 * See <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/list.html">How to Use Lists</a> 262 * in <a href="http://docs.oracle.com/javase/tutorial/"><em>The Java Tutorial</em></a> 263 * for further documentation. 264 * 265 * @see ListModel 266 * @see AbstractListModel 267 * @see DefaultListModel 268 * @see ListSelectionModel 269 * @see DefaultListSelectionModel 270 * @see ListCellRenderer 271 * @see DefaultListCellRenderer 272 * 273 * @param <E> the type of the elements of this list 274 * 275 * @author Hans Muller 276 * @since 1.2 277 */ 278 @JavaBean(defaultProperty = "UI", description = "A component which allows for the selection of one or more objects from a list.") 279 @SwingContainer(false) 280 @SuppressWarnings("serial") // Same-version serialization only 281 public class JList<E> extends JComponent implements Scrollable, Accessible 282 { 283 /** 284 * @see #getUIClassID 285 * @see #readObject 286 */ 287 private static final String uiClassID = "ListUI"; 288 289 /** 290 * Indicates a vertical layout of cells, in a single column; 291 * the default layout. 292 * @see #setLayoutOrientation 293 * @since 1.4 294 */ 295 public static final int VERTICAL = 0; 296 297 /** 298 * Indicates a "newspaper style" layout with cells flowing vertically 299 * then horizontally. 300 * @see #setLayoutOrientation 301 * @since 1.4 302 */ 303 public static final int VERTICAL_WRAP = 1; 304 305 /** 306 * Indicates a "newspaper style" layout with cells flowing horizontally 307 * then vertically. 308 * @see #setLayoutOrientation 309 * @since 1.4 310 */ 311 public static final int HORIZONTAL_WRAP = 2; 312 313 private int fixedCellWidth = -1; 314 private int fixedCellHeight = -1; 315 private int horizontalScrollIncrement = -1; 316 private E prototypeCellValue; 317 private int visibleRowCount = 8; 318 private Color selectionForeground; 319 private Color selectionBackground; 320 private boolean dragEnabled; 321 322 private ListSelectionModel selectionModel; 323 private ListModel<E> dataModel; 324 private ListCellRenderer<? super E> cellRenderer; 325 private ListSelectionListener selectionListener; 326 327 /** 328 * How to lay out the cells; defaults to <code>VERTICAL</code>. 329 */ 330 private int layoutOrientation; 331 332 /** 333 * The drop mode for this component. 334 */ 335 private DropMode dropMode = DropMode.USE_SELECTION; 336 337 /** 338 * The drop location. 339 */ 340 private transient DropLocation dropLocation; 341 342 /** 343 * Flag to indicate UI update is in progress 344 */ 345 private transient boolean updateInProgress; 346 347 /** 348 * A subclass of <code>TransferHandler.DropLocation</code> representing 349 * a drop location for a <code>JList</code>. 350 * 351 * @see #getDropLocation 352 * @since 1.6 353 */ 354 public static final class DropLocation extends TransferHandler.DropLocation { 355 private final int index; 356 private final boolean isInsert; 357 358 private DropLocation(Point p, int index, boolean isInsert) { 359 super(p); 360 this.index = index; 361 this.isInsert = isInsert; 362 } 363 364 /** 365 * Returns the index where dropped data should be placed in the 366 * list. Interpretation of the value depends on the drop mode set on 367 * the associated component. If the drop mode is either 368 * <code>DropMode.USE_SELECTION</code> or <code>DropMode.ON</code>, 369 * the return value is an index of a row in the list. If the drop mode is 370 * <code>DropMode.INSERT</code>, the return value refers to the index 371 * where the data should be inserted. If the drop mode is 372 * <code>DropMode.ON_OR_INSERT</code>, the value of 373 * <code>isInsert()</code> indicates whether the index is an index 374 * of a row, or an insert index. 375 * <p> 376 * <code>-1</code> indicates that the drop occurred over empty space, 377 * and no index could be calculated. 378 * 379 * @return the drop index 380 */ 381 public int getIndex() { 382 return index; 383 } 384 385 /** 386 * Returns whether or not this location represents an insert 387 * location. 388 * 389 * @return whether or not this is an insert location 390 */ 391 public boolean isInsert() { 392 return isInsert; 393 } 394 395 /** 396 * Returns a string representation of this drop location. 397 * This method is intended to be used for debugging purposes, 398 * and the content and format of the returned string may vary 399 * between implementations. 400 * 401 * @return a string representation of this drop location 402 */ 403 public String toString() { 404 return getClass().getName() 405 + "[dropPoint=" + getDropPoint() + "," 406 + "index=" + index + "," 407 + "insert=" + isInsert + "]"; 408 } 409 } 410 411 /** 412 * Constructs a {@code JList} that displays elements from the specified, 413 * {@code non-null}, model. All {@code JList} constructors delegate to 414 * this one. 415 * <p> 416 * This constructor registers the list with the {@code ToolTipManager}, 417 * allowing for tooltips to be provided by the cell renderers. 418 * 419 * @param dataModel the model for the list 420 * @exception IllegalArgumentException if the model is {@code null} 421 */ 422 public JList(ListModel<E> dataModel) 423 { 424 if (dataModel == null) { 425 throw new IllegalArgumentException("dataModel must be non null"); 426 } 427 428 // Register with the ToolTipManager so that tooltips from the 429 // renderer show through. 430 ToolTipManager toolTipManager = ToolTipManager.sharedInstance(); 431 toolTipManager.registerComponent(this); 432 433 layoutOrientation = VERTICAL; 434 435 this.dataModel = dataModel; 436 selectionModel = createSelectionModel(); 437 setAutoscrolls(true); 438 setOpaque(true); 439 updateUI(); 440 } 441 442 443 /** 444 * Constructs a <code>JList</code> that displays the elements in 445 * the specified array. This constructor creates a read-only model 446 * for the given array, and then delegates to the constructor that 447 * takes a {@code ListModel}. 448 * <p> 449 * Attempts to pass a {@code null} value to this method results in 450 * undefined behavior and, most likely, exceptions. The created model 451 * references the given array directly. Attempts to modify the array 452 * after constructing the list results in undefined behavior. 453 * 454 * @param listData the array of Objects to be loaded into the data model, 455 * {@code non-null} 456 */ 457 public JList(final E[] listData) 458 { 459 this ( 460 new AbstractListModel<E>() { 461 public int getSize() { return listData.length; } 462 public E getElementAt(int i) { return listData[i]; } 463 } 464 ); 465 } 466 467 468 /** 469 * Constructs a <code>JList</code> that displays the elements in 470 * the specified <code>Vector</code>. This constructor creates a read-only 471 * model for the given {@code Vector}, and then delegates to the constructor 472 * that takes a {@code ListModel}. 473 * <p> 474 * Attempts to pass a {@code null} value to this method results in 475 * undefined behavior and, most likely, exceptions. The created model 476 * references the given {@code Vector} directly. Attempts to modify the 477 * {@code Vector} after constructing the list results in undefined behavior. 478 * 479 * @param listData the <code>Vector</code> to be loaded into the 480 * data model, {@code non-null} 481 */ 482 public JList(final Vector<? extends E> listData) { 483 this ( 484 new AbstractListModel<E>() { 485 public int getSize() { return listData.size(); } 486 public E getElementAt(int i) { return listData.elementAt(i); } 487 } 488 ); 489 } 490 491 492 /** 493 * Constructs a <code>JList</code> with an empty, read-only, model. 494 */ 495 public JList() { 496 this ( 497 new AbstractListModel<E>() { 498 public int getSize() { return 0; } 499 public E getElementAt(int i) { throw new IndexOutOfBoundsException("No Data Model"); } 500 } 501 ); 502 } 503 504 505 /** 506 * Returns the {@code ListUI}, the look and feel object that 507 * renders this component. 508 * 509 * @return the <code>ListUI</code> object that renders this component 510 */ 511 public ListUI getUI() { 512 return (ListUI)ui; 513 } 514 515 516 /** 517 * Sets the {@code ListUI}, the look and feel object that 518 * renders this component. 519 * 520 * @param ui the <code>ListUI</code> object 521 * @see UIDefaults#getUI 522 */ 523 @BeanProperty(hidden = true, visualUpdate = true, description 524 = "The UI object that implements the Component's LookAndFeel.") 525 public void setUI(ListUI ui) { 526 super.setUI(ui); 527 } 528 529 530 /** 531 * Resets the {@code ListUI} property by setting it to the value provided 532 * by the current look and feel. If the current cell renderer was installed 533 * by the developer (rather than the look and feel itself), this also causes 534 * the cell renderer and its children to be updated, by calling 535 * {@code SwingUtilities.updateComponentTreeUI} on it. 536 * 537 * @see UIManager#getUI 538 * @see SwingUtilities#updateComponentTreeUI 539 */ 540 public void updateUI() { 541 if (!updateInProgress) { 542 updateInProgress = true; 543 try { 544 setUI((ListUI)UIManager.getUI(this)); 545 546 ListCellRenderer<? super E> renderer = getCellRenderer(); 547 if (renderer instanceof Component) { 548 SwingUtilities.updateComponentTreeUI((Component)renderer); 549 } 550 } finally { 551 updateInProgress = false; 552 } 553 } 554 } 555 556 557 /** 558 * Returns {@code "ListUI"}, the <code>UIDefaults</code> key used to look 559 * up the name of the {@code javax.swing.plaf.ListUI} class that defines 560 * the look and feel for this component. 561 * 562 * @return the string "ListUI" 563 * @see JComponent#getUIClassID 564 * @see UIDefaults#getUI 565 */ 566 @BeanProperty(bound = false) 567 public String getUIClassID() { 568 return uiClassID; 569 } 570 571 572 /* -----private----- 573 * This method is called by setPrototypeCellValue and setCellRenderer 574 * to update the fixedCellWidth and fixedCellHeight properties from the 575 * current value of prototypeCellValue (if it's non null). 576 * <p> 577 * This method sets fixedCellWidth and fixedCellHeight but does <b>not</b> 578 * generate PropertyChangeEvents for them. 579 * 580 * @see #setPrototypeCellValue 581 * @see #setCellRenderer 582 */ 583 private void updateFixedCellSize() 584 { 585 ListCellRenderer<? super E> cr = getCellRenderer(); 586 E value = getPrototypeCellValue(); 587 588 if ((cr != null) && (value != null)) { 589 Component c = cr.getListCellRendererComponent(this, value, 0, false, false); 590 591 /* The ListUI implementation will add Component c to its private 592 * CellRendererPane however we can't assume that's already 593 * been done here. So we temporarily set the one "inherited" 594 * property that may affect the renderer components preferred size: 595 * its font. 596 */ 597 Font f = c.getFont(); 598 c.setFont(getFont()); 599 600 Dimension d = c.getPreferredSize(); 601 fixedCellWidth = d.width; 602 fixedCellHeight = d.height; 603 604 c.setFont(f); 605 } 606 } 607 608 609 /** 610 * Returns the "prototypical" cell value -- a value used to calculate a 611 * fixed width and height for cells. This can be {@code null} if there 612 * is no such value. 613 * 614 * @return the value of the {@code prototypeCellValue} property 615 * @see #setPrototypeCellValue 616 */ 617 public E getPrototypeCellValue() { 618 return prototypeCellValue; 619 } 620 621 /** 622 * Sets the {@code prototypeCellValue} property, and then (if the new value 623 * is {@code non-null}), computes the {@code fixedCellWidth} and 624 * {@code fixedCellHeight} properties by requesting the cell renderer 625 * component for the given value (and index 0) from the cell renderer, and 626 * using that component's preferred size. 627 * <p> 628 * This method is useful when the list is too long to allow the 629 * {@code ListUI} to compute the width/height of each cell, and there is a 630 * single cell value that is known to occupy as much space as any of the 631 * others, a so-called prototype. 632 * <p> 633 * While all three of the {@code prototypeCellValue}, 634 * {@code fixedCellHeight}, and {@code fixedCellWidth} properties may be 635 * modified by this method, {@code PropertyChangeEvent} notifications are 636 * only sent when the {@code prototypeCellValue} property changes. 637 * <p> 638 * To see an example which sets this property, see the 639 * <a href="#prototype_example">class description</a> above. 640 * <p> 641 * The default value of this property is <code>null</code>. 642 * <p> 643 * This is a JavaBeans bound property. 644 * 645 * @param prototypeCellValue the value on which to base 646 * <code>fixedCellWidth</code> and 647 * <code>fixedCellHeight</code> 648 * @see #getPrototypeCellValue 649 * @see #setFixedCellWidth 650 * @see #setFixedCellHeight 651 * @see JComponent#addPropertyChangeListener 652 */ 653 @BeanProperty(visualUpdate = true, description 654 = "The cell prototype value, used to compute cell width and height.") 655 public void setPrototypeCellValue(E prototypeCellValue) { 656 E oldValue = this.prototypeCellValue; 657 this.prototypeCellValue = prototypeCellValue; 658 659 /* If the prototypeCellValue has changed and is non-null, 660 * then recompute fixedCellWidth and fixedCellHeight. 661 */ 662 663 if ((prototypeCellValue != null) && !prototypeCellValue.equals(oldValue)) { 664 updateFixedCellSize(); 665 } 666 667 firePropertyChange("prototypeCellValue", oldValue, prototypeCellValue); 668 } 669 670 671 /** 672 * Returns the value of the {@code fixedCellWidth} property. 673 * 674 * @return the fixed cell width 675 * @see #setFixedCellWidth 676 */ 677 public int getFixedCellWidth() { 678 return fixedCellWidth; 679 } 680 681 /** 682 * Sets a fixed value to be used for the width of every cell in the list. 683 * If {@code width} is -1, cell widths are computed in the {@code ListUI} 684 * by applying <code>getPreferredSize</code> to the cell renderer component 685 * for each list element. 686 * <p> 687 * The default value of this property is {@code -1}. 688 * <p> 689 * This is a JavaBeans bound property. 690 * 691 * @param width the width to be used for all cells in the list 692 * @see #setPrototypeCellValue 693 * @see #setFixedCellWidth 694 * @see JComponent#addPropertyChangeListener 695 */ 696 @BeanProperty(visualUpdate = true, description 697 = "Defines a fixed cell width when greater than zero.") 698 public void setFixedCellWidth(int width) { 699 int oldValue = fixedCellWidth; 700 fixedCellWidth = width; 701 firePropertyChange("fixedCellWidth", oldValue, fixedCellWidth); 702 } 703 704 705 /** 706 * Returns the value of the {@code fixedCellHeight} property. 707 * 708 * @return the fixed cell height 709 * @see #setFixedCellHeight 710 */ 711 public int getFixedCellHeight() { 712 return fixedCellHeight; 713 } 714 715 /** 716 * Sets a fixed value to be used for the height of every cell in the list. 717 * If {@code height} is -1, cell heights are computed in the {@code ListUI} 718 * by applying <code>getPreferredSize</code> to the cell renderer component 719 * for each list element. 720 * <p> 721 * The default value of this property is {@code -1}. 722 * <p> 723 * This is a JavaBeans bound property. 724 * 725 * @param height the height to be used for all cells in the list 726 * @see #setPrototypeCellValue 727 * @see #setFixedCellWidth 728 * @see JComponent#addPropertyChangeListener 729 */ 730 @BeanProperty(visualUpdate = true, description 731 = "Defines a fixed cell height when greater than zero.") 732 public void setFixedCellHeight(int height) { 733 int oldValue = fixedCellHeight; 734 fixedCellHeight = height; 735 firePropertyChange("fixedCellHeight", oldValue, fixedCellHeight); 736 } 737 738 739 /** 740 * Returns the object responsible for painting list items. 741 * 742 * @return the value of the {@code cellRenderer} property 743 * @see #setCellRenderer 744 */ 745 @Transient 746 public ListCellRenderer<? super E> getCellRenderer() { 747 return cellRenderer; 748 } 749 750 /** 751 * Sets the delegate that is used to paint each cell in the list. 752 * The job of a cell renderer is discussed in detail in the 753 * <a href="#renderer">class level documentation</a>. 754 * <p> 755 * If the {@code prototypeCellValue} property is {@code non-null}, 756 * setting the cell renderer also causes the {@code fixedCellWidth} and 757 * {@code fixedCellHeight} properties to be re-calculated. Only one 758 * <code>PropertyChangeEvent</code> is generated however - 759 * for the <code>cellRenderer</code> property. 760 * <p> 761 * The default value of this property is provided by the {@code ListUI} 762 * delegate, i.e. by the look and feel implementation. 763 * <p> 764 * This is a JavaBeans bound property. 765 * 766 * @param cellRenderer the <code>ListCellRenderer</code> 767 * that paints list cells 768 * @see #getCellRenderer 769 */ 770 @BeanProperty(visualUpdate = true, description 771 = "The component used to draw the cells.") 772 public void setCellRenderer(ListCellRenderer<? super E> cellRenderer) { 773 ListCellRenderer<? super E> oldValue = this.cellRenderer; 774 this.cellRenderer = cellRenderer; 775 776 /* If the cellRenderer has changed and prototypeCellValue 777 * was set, then recompute fixedCellWidth and fixedCellHeight. 778 */ 779 if ((cellRenderer != null) && !cellRenderer.equals(oldValue)) { 780 updateFixedCellSize(); 781 } 782 783 firePropertyChange("cellRenderer", oldValue, cellRenderer); 784 } 785 786 787 /** 788 * Returns the color used to draw the foreground of selected items. 789 * {@code DefaultListCellRenderer} uses this color to draw the foreground 790 * of items in the selected state, as do the renderers installed by most 791 * {@code ListUI} implementations. 792 * 793 * @return the color to draw the foreground of selected items 794 * @see #setSelectionForeground 795 * @see DefaultListCellRenderer 796 */ 797 public Color getSelectionForeground() { 798 return selectionForeground; 799 } 800 801 802 /** 803 * Sets the color used to draw the foreground of selected items, which 804 * cell renderers can use to render text and graphics. 805 * {@code DefaultListCellRenderer} uses this color to draw the foreground 806 * of items in the selected state, as do the renderers installed by most 807 * {@code ListUI} implementations. 808 * <p> 809 * The default value of this property is defined by the look and feel 810 * implementation. 811 * <p> 812 * This is a JavaBeans bound property. 813 * 814 * @param selectionForeground the {@code Color} to use in the foreground 815 * for selected list items 816 * @see #getSelectionForeground 817 * @see #setSelectionBackground 818 * @see #setForeground 819 * @see #setBackground 820 * @see #setFont 821 * @see DefaultListCellRenderer 822 */ 823 @BeanProperty(visualUpdate = true, description 824 = "The foreground color of selected cells.") 825 public void setSelectionForeground(Color selectionForeground) { 826 Color oldValue = this.selectionForeground; 827 this.selectionForeground = selectionForeground; 828 firePropertyChange("selectionForeground", oldValue, selectionForeground); 829 } 830 831 832 /** 833 * Returns the color used to draw the background of selected items. 834 * {@code DefaultListCellRenderer} uses this color to draw the background 835 * of items in the selected state, as do the renderers installed by most 836 * {@code ListUI} implementations. 837 * 838 * @return the color to draw the background of selected items 839 * @see #setSelectionBackground 840 * @see DefaultListCellRenderer 841 */ 842 public Color getSelectionBackground() { 843 return selectionBackground; 844 } 845 846 847 /** 848 * Sets the color used to draw the background of selected items, which 849 * cell renderers can use fill selected cells. 850 * {@code DefaultListCellRenderer} uses this color to fill the background 851 * of items in the selected state, as do the renderers installed by most 852 * {@code ListUI} implementations. 853 * <p> 854 * The default value of this property is defined by the look 855 * and feel implementation. 856 * <p> 857 * This is a JavaBeans bound property. 858 * 859 * @param selectionBackground the {@code Color} to use for the 860 * background of selected cells 861 * @see #getSelectionBackground 862 * @see #setSelectionForeground 863 * @see #setForeground 864 * @see #setBackground 865 * @see #setFont 866 * @see DefaultListCellRenderer 867 */ 868 @BeanProperty(visualUpdate = true, description 869 = "The background color of selected cells.") 870 public void setSelectionBackground(Color selectionBackground) { 871 Color oldValue = this.selectionBackground; 872 this.selectionBackground = selectionBackground; 873 firePropertyChange("selectionBackground", oldValue, selectionBackground); 874 } 875 876 877 /** 878 * Returns the value of the {@code visibleRowCount} property. See the 879 * documentation for {@link #setVisibleRowCount} for details on how to 880 * interpret this value. 881 * 882 * @return the value of the {@code visibleRowCount} property. 883 * @see #setVisibleRowCount 884 */ 885 public int getVisibleRowCount() { 886 return visibleRowCount; 887 } 888 889 /** 890 * Sets the {@code visibleRowCount} property, which has different meanings 891 * depending on the layout orientation: For a {@code VERTICAL} layout 892 * orientation, this sets the preferred number of rows to display without 893 * requiring scrolling; for other orientations, it affects the wrapping of 894 * cells. 895 * <p> 896 * In {@code VERTICAL} orientation:<br> 897 * Setting this property affects the return value of the 898 * {@link #getPreferredScrollableViewportSize} method, which is used to 899 * calculate the preferred size of an enclosing viewport. See that method's 900 * documentation for more details. 901 * <p> 902 * In {@code HORIZONTAL_WRAP} and {@code VERTICAL_WRAP} orientations:<br> 903 * This affects how cells are wrapped. See the documentation of 904 * {@link #setLayoutOrientation} for more details. 905 * <p> 906 * The default value of this property is {@code 8}. 907 * <p> 908 * Calling this method with a negative value results in the property 909 * being set to {@code 0}. 910 * <p> 911 * This is a JavaBeans bound property. 912 * 913 * @param visibleRowCount an integer specifying the preferred number of 914 * rows to display without requiring scrolling 915 * @see #getVisibleRowCount 916 * @see #getPreferredScrollableViewportSize 917 * @see #setLayoutOrientation 918 * @see JComponent#getVisibleRect 919 * @see JViewport 920 */ 921 @BeanProperty(visualUpdate = true, description 922 = "The preferred number of rows to display without requiring scrolling") 923 public void setVisibleRowCount(int visibleRowCount) { 924 int oldValue = this.visibleRowCount; 925 this.visibleRowCount = Math.max(0, visibleRowCount); 926 firePropertyChange("visibleRowCount", oldValue, visibleRowCount); 927 } 928 929 930 /** 931 * Returns the layout orientation property for the list: {@code VERTICAL} 932 * if the layout is a single column of cells, {@code VERTICAL_WRAP} if the 933 * layout is "newspaper style" with the content flowing vertically then 934 * horizontally, or {@code HORIZONTAL_WRAP} if the layout is "newspaper 935 * style" with the content flowing horizontally then vertically. 936 * 937 * @return the value of the {@code layoutOrientation} property 938 * @see #setLayoutOrientation 939 * @since 1.4 940 */ 941 public int getLayoutOrientation() { 942 return layoutOrientation; 943 } 944 945 946 /** 947 * Defines the way list cells are layed out. Consider a {@code JList} 948 * with five cells. Cells can be layed out in one of the following ways: 949 * 950 * <pre> 951 * VERTICAL: 0 952 * 1 953 * 2 954 * 3 955 * 4 956 * 957 * HORIZONTAL_WRAP: 0 1 2 958 * 3 4 959 * 960 * VERTICAL_WRAP: 0 3 961 * 1 4 962 * 2 963 * </pre> 964 * <p> 965 * A description of these layouts follows: 966 * 967 * <table class="striped"> 968 * <caption>Describes layouts VERTICAL,HORIZONTAL_WRAP, and VERTICAL_WRAP 969 * </caption> 970 * <thead> 971 * <tr> 972 * <th scope="col">Value 973 * <th scope="col">Description 974 * </thead> 975 * <tbody> 976 * <tr> 977 * <th scope="row">{@code VERTICAL} 978 * <td>Cells are layed out vertically in a single column. 979 * <tr> 980 * <th scope="row">{@code HORIZONTAL_WRAP} 981 * <td>Cells are layed out horizontally, wrapping to a new row as 982 * necessary. If the {@code visibleRowCount} property is less than or 983 * equal to zero, wrapping is determined by the width of the list; 984 * otherwise wrapping is done in such a way as to ensure 985 * {@code visibleRowCount} rows in the list. 986 * <tr> 987 * <th scope="row">{@code VERTICAL_WRAP} 988 * <td>Cells are layed out vertically, wrapping to a new column as 989 * necessary. If the {@code visibleRowCount} property is less than or 990 * equal to zero, wrapping is determined by the height of the list; 991 * otherwise wrapping is done at {@code visibleRowCount} rows. 992 * </tbody> 993 * </table> 994 * 995 * The default value of this property is <code>VERTICAL</code>. 996 * 997 * @param layoutOrientation the new layout orientation, one of: 998 * {@code VERTICAL}, {@code HORIZONTAL_WRAP} or {@code VERTICAL_WRAP} 999 * @see #getLayoutOrientation 1000 * @see #setVisibleRowCount 1001 * @see #getScrollableTracksViewportHeight 1002 * @see #getScrollableTracksViewportWidth 1003 * @throws IllegalArgumentException if {@code layoutOrientation} isn't one of the 1004 * allowable values 1005 * @since 1.4 1006 */ 1007 @BeanProperty(visualUpdate = true, enumerationValues = { 1008 "JList.VERTICAL", 1009 "JList.HORIZONTAL_WRAP", 1010 "JList.VERTICAL_WRAP"}, description 1011 = "Defines the way list cells are layed out.") 1012 public void setLayoutOrientation(int layoutOrientation) { 1013 int oldValue = this.layoutOrientation; 1014 switch (layoutOrientation) { 1015 case VERTICAL: 1016 case VERTICAL_WRAP: 1017 case HORIZONTAL_WRAP: 1018 this.layoutOrientation = layoutOrientation; 1019 firePropertyChange("layoutOrientation", oldValue, layoutOrientation); 1020 break; 1021 default: 1022 throw new IllegalArgumentException("layoutOrientation must be one of: VERTICAL, HORIZONTAL_WRAP or VERTICAL_WRAP"); 1023 } 1024 } 1025 1026 1027 /** 1028 * Returns the smallest list index that is currently visible. 1029 * In a left-to-right {@code componentOrientation}, the first visible 1030 * cell is found closest to the list's upper-left corner. In right-to-left 1031 * orientation, it is found closest to the upper-right corner. 1032 * If nothing is visible or the list is empty, {@code -1} is returned. 1033 * Note that the returned cell may only be partially visible. 1034 * 1035 * @return the index of the first visible cell 1036 * @see #getLastVisibleIndex 1037 * @see JComponent#getVisibleRect 1038 */ 1039 @BeanProperty(bound = false) 1040 public int getFirstVisibleIndex() { 1041 Rectangle r = getVisibleRect(); 1042 int first; 1043 if (this.getComponentOrientation().isLeftToRight()) { 1044 first = locationToIndex(r.getLocation()); 1045 } else { 1046 first = locationToIndex(new Point((r.x + r.width) - 1, r.y)); 1047 } 1048 if (first != -1) { 1049 Rectangle bounds = getCellBounds(first, first); 1050 if (bounds != null) { 1051 SwingUtilities.computeIntersection(r.x, r.y, r.width, r.height, bounds); 1052 if (bounds.width == 0 || bounds.height == 0) { 1053 first = -1; 1054 } 1055 } 1056 } 1057 return first; 1058 } 1059 1060 1061 /** 1062 * Returns the largest list index that is currently visible. 1063 * If nothing is visible or the list is empty, {@code -1} is returned. 1064 * Note that the returned cell may only be partially visible. 1065 * 1066 * @return the index of the last visible cell 1067 * @see #getFirstVisibleIndex 1068 * @see JComponent#getVisibleRect 1069 */ 1070 @BeanProperty(bound = false) 1071 public int getLastVisibleIndex() { 1072 boolean leftToRight = this.getComponentOrientation().isLeftToRight(); 1073 Rectangle r = getVisibleRect(); 1074 Point lastPoint; 1075 if (leftToRight) { 1076 lastPoint = new Point((r.x + r.width) - 1, (r.y + r.height) - 1); 1077 } else { 1078 lastPoint = new Point(r.x, (r.y + r.height) - 1); 1079 } 1080 int location = locationToIndex(lastPoint); 1081 1082 if (location != -1) { 1083 Rectangle bounds = getCellBounds(location, location); 1084 1085 if (bounds != null) { 1086 SwingUtilities.computeIntersection(r.x, r.y, r.width, r.height, bounds); 1087 if (bounds.width == 0 || bounds.height == 0) { 1088 // Try the top left(LTR) or top right(RTL) corner, and 1089 // then go across checking each cell for HORIZONTAL_WRAP. 1090 // Try the lower left corner, and then go across checking 1091 // each cell for other list layout orientation. 1092 boolean isHorizontalWrap = 1093 (getLayoutOrientation() == HORIZONTAL_WRAP); 1094 Point visibleLocation = isHorizontalWrap ? 1095 new Point(lastPoint.x, r.y) : 1096 new Point(r.x, lastPoint.y); 1097 int last; 1098 int visIndex = -1; 1099 int lIndex = location; 1100 location = -1; 1101 1102 do { 1103 last = visIndex; 1104 visIndex = locationToIndex(visibleLocation); 1105 1106 if (visIndex != -1) { 1107 bounds = getCellBounds(visIndex, visIndex); 1108 if (visIndex != lIndex && bounds != null && 1109 bounds.contains(visibleLocation)) { 1110 location = visIndex; 1111 if (isHorizontalWrap) { 1112 visibleLocation.y = bounds.y + bounds.height; 1113 if (visibleLocation.y >= lastPoint.y) { 1114 // Past visible region, bail. 1115 last = visIndex; 1116 } 1117 } 1118 else { 1119 visibleLocation.x = bounds.x + bounds.width; 1120 if (visibleLocation.x >= lastPoint.x) { 1121 // Past visible region, bail. 1122 last = visIndex; 1123 } 1124 } 1125 1126 } 1127 else { 1128 last = visIndex; 1129 } 1130 } 1131 } while (visIndex != -1 && last != visIndex); 1132 } 1133 } 1134 } 1135 return location; 1136 } 1137 1138 1139 /** 1140 * Scrolls the list within an enclosing viewport to make the specified 1141 * cell completely visible. This calls {@code scrollRectToVisible} with 1142 * the bounds of the specified cell. For this method to work, the 1143 * {@code JList} must be within a <code>JViewport</code>. 1144 * <p> 1145 * If the given index is outside the list's range of cells, this method 1146 * results in nothing. 1147 * 1148 * @param index the index of the cell to make visible 1149 * @see JComponent#scrollRectToVisible 1150 * @see #getVisibleRect 1151 */ 1152 public void ensureIndexIsVisible(int index) { 1153 Rectangle cellBounds = getCellBounds(index, index); 1154 if (cellBounds != null) { 1155 scrollRectToVisible(cellBounds); 1156 } 1157 } 1158 1159 /** 1160 * Turns on or off automatic drag handling. In order to enable automatic 1161 * drag handling, this property should be set to {@code true}, and the 1162 * list's {@code TransferHandler} needs to be {@code non-null}. 1163 * The default value of the {@code dragEnabled} property is {@code false}. 1164 * <p> 1165 * The job of honoring this property, and recognizing a user drag gesture, 1166 * lies with the look and feel implementation, and in particular, the list's 1167 * {@code ListUI}. When automatic drag handling is enabled, most look and 1168 * feels (including those that subclass {@code BasicLookAndFeel}) begin a 1169 * drag and drop operation whenever the user presses the mouse button over 1170 * an item and then moves the mouse a few pixels. Setting this property to 1171 * {@code true} can therefore have a subtle effect on how selections behave. 1172 * <p> 1173 * If a look and feel is used that ignores this property, you can still 1174 * begin a drag and drop operation by calling {@code exportAsDrag} on the 1175 * list's {@code TransferHandler}. 1176 * 1177 * @param b whether or not to enable automatic drag handling 1178 * @exception HeadlessException if 1179 * <code>b</code> is <code>true</code> and 1180 * <code>GraphicsEnvironment.isHeadless()</code> 1181 * returns <code>true</code> 1182 * @see java.awt.GraphicsEnvironment#isHeadless 1183 * @see #getDragEnabled 1184 * @see #setTransferHandler 1185 * @see TransferHandler 1186 * @since 1.4 1187 */ 1188 @BeanProperty(bound = false, description 1189 = "determines whether automatic drag handling is enabled") 1190 public void setDragEnabled(boolean b) { 1191 if (b && GraphicsEnvironment.isHeadless()) { 1192 throw new HeadlessException(); 1193 } 1194 dragEnabled = b; 1195 } 1196 1197 /** 1198 * Returns whether or not automatic drag handling is enabled. 1199 * 1200 * @return the value of the {@code dragEnabled} property 1201 * @see #setDragEnabled 1202 * @since 1.4 1203 */ 1204 public boolean getDragEnabled() { 1205 return dragEnabled; 1206 } 1207 1208 /** 1209 * Sets the drop mode for this component. For backward compatibility, 1210 * the default for this property is <code>DropMode.USE_SELECTION</code>. 1211 * Usage of one of the other modes is recommended, however, for an 1212 * improved user experience. <code>DropMode.ON</code>, for instance, 1213 * offers similar behavior of showing items as selected, but does so without 1214 * affecting the actual selection in the list. 1215 * <p> 1216 * <code>JList</code> supports the following drop modes: 1217 * <ul> 1218 * <li><code>DropMode.USE_SELECTION</code></li> 1219 * <li><code>DropMode.ON</code></li> 1220 * <li><code>DropMode.INSERT</code></li> 1221 * <li><code>DropMode.ON_OR_INSERT</code></li> 1222 * </ul> 1223 * The drop mode is only meaningful if this component has a 1224 * <code>TransferHandler</code> that accepts drops. 1225 * 1226 * @param dropMode the drop mode to use 1227 * @throws IllegalArgumentException if the drop mode is unsupported 1228 * or <code>null</code> 1229 * @see #getDropMode 1230 * @see #getDropLocation 1231 * @see #setTransferHandler 1232 * @see TransferHandler 1233 * @since 1.6 1234 */ 1235 public final void setDropMode(DropMode dropMode) { 1236 if (dropMode != null) { 1237 switch (dropMode) { 1238 case USE_SELECTION: 1239 case ON: 1240 case INSERT: 1241 case ON_OR_INSERT: 1242 this.dropMode = dropMode; 1243 return; 1244 } 1245 } 1246 1247 throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for list"); 1248 } 1249 1250 /** 1251 * Returns the drop mode for this component. 1252 * 1253 * @return the drop mode for this component 1254 * @see #setDropMode 1255 * @since 1.6 1256 */ 1257 public final DropMode getDropMode() { 1258 return dropMode; 1259 } 1260 1261 /** 1262 * Calculates a drop location in this component, representing where a 1263 * drop at the given point should insert data. 1264 * 1265 * @param p the point to calculate a drop location for 1266 * @return the drop location, or <code>null</code> 1267 */ 1268 DropLocation dropLocationForPoint(Point p) { 1269 DropLocation location = null; 1270 Rectangle rect = null; 1271 1272 int index = locationToIndex(p); 1273 if (index != -1) { 1274 rect = getCellBounds(index, index); 1275 } 1276 1277 switch(dropMode) { 1278 case USE_SELECTION: 1279 case ON: 1280 location = new DropLocation(p, 1281 (rect != null && rect.contains(p)) ? index : -1, 1282 false); 1283 1284 break; 1285 case INSERT: 1286 if (index == -1) { 1287 location = new DropLocation(p, getModel().getSize(), true); 1288 break; 1289 } 1290 1291 if (layoutOrientation == HORIZONTAL_WRAP) { 1292 boolean ltr = getComponentOrientation().isLeftToRight(); 1293 1294 if (SwingUtilities2.liesInHorizontal(rect, p, ltr, false) == TRAILING) { 1295 index++; 1296 // special case for below all cells 1297 } else if (index == getModel().getSize() - 1 && p.y >= rect.y + rect.height) { 1298 index++; 1299 } 1300 } else { 1301 if (SwingUtilities2.liesInVertical(rect, p, false) == TRAILING) { 1302 index++; 1303 } 1304 } 1305 1306 location = new DropLocation(p, index, true); 1307 1308 break; 1309 case ON_OR_INSERT: 1310 if (index == -1) { 1311 location = new DropLocation(p, getModel().getSize(), true); 1312 break; 1313 } 1314 1315 boolean between = false; 1316 1317 if (layoutOrientation == HORIZONTAL_WRAP) { 1318 boolean ltr = getComponentOrientation().isLeftToRight(); 1319 1320 Section section = SwingUtilities2.liesInHorizontal(rect, p, ltr, true); 1321 if (section == TRAILING) { 1322 index++; 1323 between = true; 1324 // special case for below all cells 1325 } else if (index == getModel().getSize() - 1 && p.y >= rect.y + rect.height) { 1326 index++; 1327 between = true; 1328 } else if (section == LEADING) { 1329 between = true; 1330 } 1331 } else { 1332 Section section = SwingUtilities2.liesInVertical(rect, p, true); 1333 if (section == LEADING) { 1334 between = true; 1335 } else if (section == TRAILING) { 1336 index++; 1337 between = true; 1338 } 1339 } 1340 1341 location = new DropLocation(p, index, between); 1342 1343 break; 1344 default: 1345 assert false : "Unexpected drop mode"; 1346 } 1347 1348 return location; 1349 } 1350 1351 /** 1352 * Called to set or clear the drop location during a DnD operation. 1353 * In some cases, the component may need to use it's internal selection 1354 * temporarily to indicate the drop location. To help facilitate this, 1355 * this method returns and accepts as a parameter a state object. 1356 * This state object can be used to store, and later restore, the selection 1357 * state. Whatever this method returns will be passed back to it in 1358 * future calls, as the state parameter. If it wants the DnD system to 1359 * continue storing the same state, it must pass it back every time. 1360 * Here's how this is used: 1361 * <p> 1362 * Let's say that on the first call to this method the component decides 1363 * to save some state (because it is about to use the selection to show 1364 * a drop index). It can return a state object to the caller encapsulating 1365 * any saved selection state. On a second call, let's say the drop location 1366 * is being changed to something else. The component doesn't need to 1367 * restore anything yet, so it simply passes back the same state object 1368 * to have the DnD system continue storing it. Finally, let's say this 1369 * method is messaged with <code>null</code>. This means DnD 1370 * is finished with this component for now, meaning it should restore 1371 * state. At this point, it can use the state parameter to restore 1372 * said state, and of course return <code>null</code> since there's 1373 * no longer anything to store. 1374 * 1375 * @param location the drop location (as calculated by 1376 * <code>dropLocationForPoint</code>) or <code>null</code> 1377 * if there's no longer a valid drop location 1378 * @param state the state object saved earlier for this component, 1379 * or <code>null</code> 1380 * @param forDrop whether or not the method is being called because an 1381 * actual drop occurred 1382 * @return any saved state for this component, or <code>null</code> if none 1383 */ 1384 Object setDropLocation(TransferHandler.DropLocation location, 1385 Object state, 1386 boolean forDrop) { 1387 1388 Object retVal = null; 1389 DropLocation listLocation = (DropLocation)location; 1390 1391 if (dropMode == DropMode.USE_SELECTION) { 1392 if (listLocation == null) { 1393 if (!forDrop && state != null) { 1394 setSelectedIndices(((int[][])state)[0]); 1395 1396 int anchor = ((int[][])state)[1][0]; 1397 int lead = ((int[][])state)[1][1]; 1398 1399 SwingUtilities2.setLeadAnchorWithoutSelection( 1400 getSelectionModel(), lead, anchor); 1401 } 1402 } else { 1403 if (dropLocation == null) { 1404 int[] inds = getSelectedIndices(); 1405 retVal = new int[][] {inds, {getAnchorSelectionIndex(), 1406 getLeadSelectionIndex()}}; 1407 } else { 1408 retVal = state; 1409 } 1410 1411 int index = listLocation.getIndex(); 1412 if (index == -1) { 1413 clearSelection(); 1414 getSelectionModel().setAnchorSelectionIndex(-1); 1415 getSelectionModel().setLeadSelectionIndex(-1); 1416 } else { 1417 setSelectionInterval(index, index); 1418 } 1419 } 1420 } 1421 1422 DropLocation old = dropLocation; 1423 dropLocation = listLocation; 1424 firePropertyChange("dropLocation", old, dropLocation); 1425 1426 return retVal; 1427 } 1428 1429 /** 1430 * Returns the location that this component should visually indicate 1431 * as the drop location during a DnD operation over the component, 1432 * or {@code null} if no location is to currently be shown. 1433 * <p> 1434 * This method is not meant for querying the drop location 1435 * from a {@code TransferHandler}, as the drop location is only 1436 * set after the {@code TransferHandler}'s <code>canImport</code> 1437 * has returned and has allowed for the location to be shown. 1438 * <p> 1439 * When this property changes, a property change event with 1440 * name "dropLocation" is fired by the component. 1441 * <p> 1442 * By default, responsibility for listening for changes to this property 1443 * and indicating the drop location visually lies with the list's 1444 * {@code ListUI}, which may paint it directly and/or install a cell 1445 * renderer to do so. Developers wishing to implement custom drop location 1446 * painting and/or replace the default cell renderer, may need to honor 1447 * this property. 1448 * 1449 * @return the drop location 1450 * @see #setDropMode 1451 * @see TransferHandler#canImport(TransferHandler.TransferSupport) 1452 * @since 1.6 1453 */ 1454 @BeanProperty(bound = false) 1455 public final DropLocation getDropLocation() { 1456 return dropLocation; 1457 } 1458 1459 /** 1460 * Returns the next list element whose {@code toString} value 1461 * starts with the given prefix. 1462 * 1463 * @param prefix the string to test for a match 1464 * @param startIndex the index for starting the search 1465 * @param bias the search direction, either 1466 * Position.Bias.Forward or Position.Bias.Backward. 1467 * @return the index of the next list element that 1468 * starts with the prefix; otherwise {@code -1} 1469 * @exception IllegalArgumentException if prefix is {@code null} 1470 * or startIndex is out of bounds 1471 * @since 1.4 1472 */ 1473 public int getNextMatch(String prefix, int startIndex, Position.Bias bias) { 1474 ListModel<E> model = getModel(); 1475 int max = model.getSize(); 1476 if (prefix == null) { 1477 throw new IllegalArgumentException(); 1478 } 1479 if (startIndex < 0 || startIndex >= max) { 1480 throw new IllegalArgumentException(); 1481 } 1482 prefix = prefix.toUpperCase(); 1483 1484 // start search from the next element after the selected element 1485 int increment = (bias == Position.Bias.Forward) ? 1 : -1; 1486 int index = startIndex; 1487 do { 1488 E element = model.getElementAt(index); 1489 1490 if (element != null) { 1491 String string; 1492 1493 if (element instanceof String) { 1494 string = ((String)element).toUpperCase(); 1495 } 1496 else { 1497 string = element.toString(); 1498 if (string != null) { 1499 string = string.toUpperCase(); 1500 } 1501 } 1502 1503 if (string != null && string.startsWith(prefix)) { 1504 return index; 1505 } 1506 } 1507 index = (index + increment + max) % max; 1508 } while (index != startIndex); 1509 return -1; 1510 } 1511 1512 /** 1513 * Returns the tooltip text to be used for the given event. This overrides 1514 * {@code JComponent}'s {@code getToolTipText} to first check the cell 1515 * renderer component for the cell over which the event occurred, returning 1516 * its tooltip text, if any. This implementation allows you to specify 1517 * tooltip text on the cell level, by using {@code setToolTipText} on your 1518 * cell renderer component. 1519 * <p> 1520 * <strong>Note:</strong> For <code>JList</code> to properly display the 1521 * tooltips of its renderers in this manner, <code>JList</code> must be a 1522 * registered component with the <code>ToolTipManager</code>. This registration 1523 * is done automatically in the constructor. However, if at a later point 1524 * <code>JList</code> is unregistered, by way of a call to 1525 * {@code setToolTipText(null)}, tips from the renderers will no longer display. 1526 * 1527 * @param event the {@code MouseEvent} to fetch the tooltip text for 1528 * @see JComponent#setToolTipText 1529 * @see JComponent#getToolTipText 1530 */ 1531 @SuppressWarnings("deprecation") 1532 public String getToolTipText(MouseEvent event) { 1533 if(event != null) { 1534 Point p = event.getPoint(); 1535 int index = locationToIndex(p); 1536 ListCellRenderer<? super E> r = getCellRenderer(); 1537 Rectangle cellBounds; 1538 1539 if (index != -1 && r != null && (cellBounds = 1540 getCellBounds(index, index)) != null && 1541 cellBounds.contains(p.x, p.y)) { 1542 ListSelectionModel lsm = getSelectionModel(); 1543 Component rComponent = r.getListCellRendererComponent( 1544 this, getModel().getElementAt(index), index, 1545 lsm.isSelectedIndex(index), 1546 (hasFocus() && (lsm.getLeadSelectionIndex() == 1547 index))); 1548 1549 if(rComponent instanceof JComponent) { 1550 MouseEvent newEvent; 1551 1552 p.translate(-cellBounds.x, -cellBounds.y); 1553 newEvent = new MouseEvent(rComponent, event.getID(), 1554 event.getWhen(), 1555 event.getModifiers(), 1556 p.x, p.y, 1557 event.getXOnScreen(), 1558 event.getYOnScreen(), 1559 event.getClickCount(), 1560 event.isPopupTrigger(), 1561 MouseEvent.NOBUTTON); 1562 MouseEventAccessor meAccessor = 1563 AWTAccessor.getMouseEventAccessor(); 1564 meAccessor.setCausedByTouchEvent(newEvent, 1565 meAccessor.isCausedByTouchEvent(event)); 1566 1567 String tip = ((JComponent)rComponent).getToolTipText( 1568 newEvent); 1569 1570 if (tip != null) { 1571 return tip; 1572 } 1573 } 1574 } 1575 } 1576 return super.getToolTipText(); 1577 } 1578 1579 /** 1580 * --- ListUI Delegations --- 1581 */ 1582 1583 1584 /** 1585 * Returns the cell index closest to the given location in the list's 1586 * coordinate system. To determine if the cell actually contains the 1587 * specified location, compare the point against the cell's bounds, 1588 * as provided by {@code getCellBounds}. This method returns {@code -1} 1589 * if the model is empty 1590 * <p> 1591 * This is a cover method that delegates to the method of the same name 1592 * in the list's {@code ListUI}. It returns {@code -1} if the list has 1593 * no {@code ListUI}. 1594 * 1595 * @param location the coordinates of the point 1596 * @return the cell index closest to the given location, or {@code -1} 1597 */ 1598 public int locationToIndex(Point location) { 1599 ListUI ui = getUI(); 1600 return (ui != null) ? ui.locationToIndex(this, location) : -1; 1601 } 1602 1603 1604 /** 1605 * Returns the origin of the specified item in the list's coordinate 1606 * system. This method returns {@code null} if the index isn't valid. 1607 * <p> 1608 * This is a cover method that delegates to the method of the same name 1609 * in the list's {@code ListUI}. It returns {@code null} if the list has 1610 * no {@code ListUI}. 1611 * 1612 * @param index the cell index 1613 * @return the origin of the cell, or {@code null} 1614 */ 1615 public Point indexToLocation(int index) { 1616 ListUI ui = getUI(); 1617 return (ui != null) ? ui.indexToLocation(this, index) : null; 1618 } 1619 1620 1621 /** 1622 * Returns the bounding rectangle, in the list's coordinate system, 1623 * for the range of cells specified by the two indices. 1624 * These indices can be supplied in any order. 1625 * <p> 1626 * If the smaller index is outside the list's range of cells, this method 1627 * returns {@code null}. If the smaller index is valid, but the larger 1628 * index is outside the list's range, the bounds of just the first index 1629 * is returned. Otherwise, the bounds of the valid range is returned. 1630 * <p> 1631 * This is a cover method that delegates to the method of the same name 1632 * in the list's {@code ListUI}. It returns {@code null} if the list has 1633 * no {@code ListUI}. 1634 * 1635 * @param index0 the first index in the range 1636 * @param index1 the second index in the range 1637 * @return the bounding rectangle for the range of cells, or {@code null} 1638 */ 1639 public Rectangle getCellBounds(int index0, int index1) { 1640 ListUI ui = getUI(); 1641 return (ui != null) ? ui.getCellBounds(this, index0, index1) : null; 1642 } 1643 1644 1645 /** 1646 * --- ListModel Support --- 1647 */ 1648 1649 1650 /** 1651 * Returns the data model that holds the list of items displayed 1652 * by the <code>JList</code> component. 1653 * 1654 * @return the <code>ListModel</code> that provides the displayed 1655 * list of items 1656 * @see #setModel 1657 */ 1658 public ListModel<E> getModel() { 1659 return dataModel; 1660 } 1661 1662 /** 1663 * Sets the model that represents the contents or "value" of the 1664 * list, notifies property change listeners, and then clears the 1665 * list's selection. 1666 * <p> 1667 * This is a JavaBeans bound property. 1668 * 1669 * @param model the <code>ListModel</code> that provides the 1670 * list of items for display 1671 * @exception IllegalArgumentException if <code>model</code> is 1672 * <code>null</code> 1673 * @see #getModel 1674 * @see #clearSelection 1675 */ 1676 @BeanProperty(visualUpdate = true, description 1677 = "The object that contains the data to be drawn by this JList.") 1678 public void setModel(ListModel<E> model) { 1679 if (model == null) { 1680 throw new IllegalArgumentException("model must be non null"); 1681 } 1682 ListModel<E> oldValue = dataModel; 1683 dataModel = model; 1684 firePropertyChange("model", oldValue, dataModel); 1685 clearSelection(); 1686 } 1687 1688 1689 /** 1690 * Constructs a read-only <code>ListModel</code> from an array of items, 1691 * and calls {@code setModel} with this model. 1692 * <p> 1693 * Attempts to pass a {@code null} value to this method results in 1694 * undefined behavior and, most likely, exceptions. The created model 1695 * references the given array directly. Attempts to modify the array 1696 * after invoking this method results in undefined behavior. 1697 * 1698 * @param listData an array of {@code E} containing the items to 1699 * display in the list 1700 * @see #setModel 1701 */ 1702 public void setListData(final E[] listData) { 1703 setModel ( 1704 new AbstractListModel<E>() { 1705 public int getSize() { return listData.length; } 1706 public E getElementAt(int i) { return listData[i]; } 1707 } 1708 ); 1709 } 1710 1711 1712 /** 1713 * Constructs a read-only <code>ListModel</code> from a <code>Vector</code> 1714 * and calls {@code setModel} with this model. 1715 * <p> 1716 * Attempts to pass a {@code null} value to this method results in 1717 * undefined behavior and, most likely, exceptions. The created model 1718 * references the given {@code Vector} directly. Attempts to modify the 1719 * {@code Vector} after invoking this method results in undefined behavior. 1720 * 1721 * @param listData a <code>Vector</code> containing the items to 1722 * display in the list 1723 * @see #setModel 1724 */ 1725 public void setListData(final Vector<? extends E> listData) { 1726 setModel ( 1727 new AbstractListModel<E>() { 1728 public int getSize() { return listData.size(); } 1729 public E getElementAt(int i) { return listData.elementAt(i); } 1730 } 1731 ); 1732 } 1733 1734 1735 /** 1736 * --- ListSelectionModel delegations and extensions --- 1737 */ 1738 1739 1740 /** 1741 * Returns an instance of {@code DefaultListSelectionModel}; called 1742 * during construction to initialize the list's selection model 1743 * property. 1744 * 1745 * @return a {@code DefaultListSelecitonModel}, used to initialize 1746 * the list's selection model property during construction 1747 * @see #setSelectionModel 1748 * @see DefaultListSelectionModel 1749 */ 1750 protected ListSelectionModel createSelectionModel() { 1751 return new DefaultListSelectionModel(); 1752 } 1753 1754 1755 /** 1756 * Returns the current selection model. The selection model maintains the 1757 * selection state of the list. See the class level documentation for more 1758 * details. 1759 * 1760 * @return the <code>ListSelectionModel</code> that maintains the 1761 * list's selections 1762 * 1763 * @see #setSelectionModel 1764 * @see ListSelectionModel 1765 */ 1766 public ListSelectionModel getSelectionModel() { 1767 return selectionModel; 1768 } 1769 1770 1771 /** 1772 * Notifies {@code ListSelectionListener}s added directly to the list 1773 * of selection changes made to the selection model. {@code JList} 1774 * listens for changes made to the selection in the selection model, 1775 * and forwards notification to listeners added to the list directly, 1776 * by calling this method. 1777 * <p> 1778 * This method constructs a {@code ListSelectionEvent} with this list 1779 * as the source, and the specified arguments, and sends it to the 1780 * registered {@code ListSelectionListeners}. 1781 * 1782 * @param firstIndex the first index in the range, {@code <= lastIndex} 1783 * @param lastIndex the last index in the range, {@code >= firstIndex} 1784 * @param isAdjusting whether or not this is one in a series of 1785 * multiple events, where changes are still being made 1786 * 1787 * @see #addListSelectionListener 1788 * @see #removeListSelectionListener 1789 * @see javax.swing.event.ListSelectionEvent 1790 * @see EventListenerList 1791 */ 1792 protected void fireSelectionValueChanged(int firstIndex, int lastIndex, 1793 boolean isAdjusting) 1794 { 1795 Object[] listeners = listenerList.getListenerList(); 1796 ListSelectionEvent e = null; 1797 1798 for (int i = listeners.length - 2; i >= 0; i -= 2) { 1799 if (listeners[i] == ListSelectionListener.class) { 1800 if (e == null) { 1801 e = new ListSelectionEvent(this, firstIndex, lastIndex, 1802 isAdjusting); 1803 } 1804 ((ListSelectionListener)listeners[i+1]).valueChanged(e); 1805 } 1806 } 1807 } 1808 1809 1810 /* A ListSelectionListener that forwards ListSelectionEvents from 1811 * the selectionModel to the JList ListSelectionListeners. The 1812 * forwarded events only differ from the originals in that their 1813 * source is the JList instead of the selectionModel itself. 1814 */ 1815 private class ListSelectionHandler implements ListSelectionListener, Serializable 1816 { 1817 public void valueChanged(ListSelectionEvent e) { 1818 fireSelectionValueChanged(e.getFirstIndex(), 1819 e.getLastIndex(), 1820 e.getValueIsAdjusting()); 1821 } 1822 } 1823 1824 1825 /** 1826 * Adds a listener to the list, to be notified each time a change to the 1827 * selection occurs; the preferred way of listening for selection state 1828 * changes. {@code JList} takes care of listening for selection state 1829 * changes in the selection model, and notifies the given listener of 1830 * each change. {@code ListSelectionEvent}s sent to the listener have a 1831 * {@code source} property set to this list. 1832 * 1833 * @param listener the {@code ListSelectionListener} to add 1834 * @see #getSelectionModel 1835 * @see #getListSelectionListeners 1836 */ 1837 public void addListSelectionListener(ListSelectionListener listener) 1838 { 1839 if (selectionListener == null) { 1840 selectionListener = new ListSelectionHandler(); 1841 getSelectionModel().addListSelectionListener(selectionListener); 1842 } 1843 1844 listenerList.add(ListSelectionListener.class, listener); 1845 } 1846 1847 1848 /** 1849 * Removes a selection listener from the list. 1850 * 1851 * @param listener the {@code ListSelectionListener} to remove 1852 * @see #addListSelectionListener 1853 * @see #getSelectionModel 1854 */ 1855 public void removeListSelectionListener(ListSelectionListener listener) { 1856 listenerList.remove(ListSelectionListener.class, listener); 1857 } 1858 1859 1860 /** 1861 * Returns an array of all the {@code ListSelectionListener}s added 1862 * to this {@code JList} by way of {@code addListSelectionListener}. 1863 * 1864 * @return all of the {@code ListSelectionListener}s on this list, or 1865 * an empty array if no listeners have been added 1866 * @see #addListSelectionListener 1867 * @since 1.4 1868 */ 1869 @BeanProperty(bound = false) 1870 public ListSelectionListener[] getListSelectionListeners() { 1871 return listenerList.getListeners(ListSelectionListener.class); 1872 } 1873 1874 1875 /** 1876 * Sets the <code>selectionModel</code> for the list to a 1877 * non-<code>null</code> <code>ListSelectionModel</code> 1878 * implementation. The selection model handles the task of making single 1879 * selections, selections of contiguous ranges, and non-contiguous 1880 * selections. 1881 * <p> 1882 * This is a JavaBeans bound property. 1883 * 1884 * @param selectionModel the <code>ListSelectionModel</code> that 1885 * implements the selections 1886 * @exception IllegalArgumentException if <code>selectionModel</code> 1887 * is <code>null</code> 1888 * @see #getSelectionModel 1889 */ 1890 @BeanProperty(description 1891 = "The selection model, recording which cells are selected.") 1892 public void setSelectionModel(ListSelectionModel selectionModel) { 1893 if (selectionModel == null) { 1894 throw new IllegalArgumentException("selectionModel must be non null"); 1895 } 1896 1897 /* Remove the forwarding ListSelectionListener from the old 1898 * selectionModel, and add it to the new one, if necessary. 1899 */ 1900 if (selectionListener != null) { 1901 this.selectionModel.removeListSelectionListener(selectionListener); 1902 selectionModel.addListSelectionListener(selectionListener); 1903 } 1904 1905 ListSelectionModel oldValue = this.selectionModel; 1906 this.selectionModel = selectionModel; 1907 firePropertyChange("selectionModel", oldValue, selectionModel); 1908 } 1909 1910 1911 /** 1912 * Sets the selection mode for the list. This is a cover method that sets 1913 * the selection mode directly on the selection model. 1914 * <p> 1915 * The following list describes the accepted selection modes: 1916 * <ul> 1917 * <li>{@code ListSelectionModel.SINGLE_SELECTION} - 1918 * Only one list index can be selected at a time. In this mode, 1919 * {@code setSelectionInterval} and {@code addSelectionInterval} are 1920 * equivalent, both replacing the current selection with the index 1921 * represented by the second argument (the "lead"). 1922 * <li>{@code ListSelectionModel.SINGLE_INTERVAL_SELECTION} - 1923 * Only one contiguous interval can be selected at a time. 1924 * In this mode, {@code addSelectionInterval} behaves like 1925 * {@code setSelectionInterval} (replacing the current selection}, 1926 * unless the given interval is immediately adjacent to or overlaps 1927 * the existing selection, and can be used to grow the selection. 1928 * <li>{@code ListSelectionModel.MULTIPLE_INTERVAL_SELECTION} - 1929 * In this mode, there's no restriction on what can be selected. 1930 * This mode is the default. 1931 * </ul> 1932 * 1933 * @param selectionMode the selection mode 1934 * @see #getSelectionMode 1935 * @throws IllegalArgumentException if the selection mode isn't 1936 * one of those allowed 1937 */ 1938 @BeanProperty(bound = false, enumerationValues = { 1939 "ListSelectionModel.SINGLE_SELECTION", 1940 "ListSelectionModel.SINGLE_INTERVAL_SELECTION", 1941 "ListSelectionModel.MULTIPLE_INTERVAL_SELECTION"}, description 1942 = "The selection mode.") 1943 public void setSelectionMode(int selectionMode) { 1944 getSelectionModel().setSelectionMode(selectionMode); 1945 } 1946 1947 /** 1948 * Returns the current selection mode for the list. This is a cover 1949 * method that delegates to the method of the same name on the 1950 * list's selection model. 1951 * 1952 * @return the current selection mode 1953 * @see #setSelectionMode 1954 */ 1955 public int getSelectionMode() { 1956 return getSelectionModel().getSelectionMode(); 1957 } 1958 1959 1960 /** 1961 * Returns the anchor selection index. This is a cover method that 1962 * delegates to the method of the same name on the list's selection model. 1963 * 1964 * @return the anchor selection index 1965 * @see ListSelectionModel#getAnchorSelectionIndex 1966 */ 1967 @BeanProperty(bound = false) 1968 public int getAnchorSelectionIndex() { 1969 return getSelectionModel().getAnchorSelectionIndex(); 1970 } 1971 1972 1973 /** 1974 * Returns the lead selection index. This is a cover method that 1975 * delegates to the method of the same name on the list's selection model. 1976 * 1977 * @return the lead selection index 1978 * @see ListSelectionModel#getLeadSelectionIndex 1979 */ 1980 @BeanProperty(bound = false, description 1981 = "The lead selection index.") 1982 public int getLeadSelectionIndex() { 1983 return getSelectionModel().getLeadSelectionIndex(); 1984 } 1985 1986 1987 /** 1988 * Returns the smallest selected cell index, or {@code -1} if the selection 1989 * is empty. This is a cover method that delegates to the method of the same 1990 * name on the list's selection model. 1991 * 1992 * @return the smallest selected cell index, or {@code -1} 1993 * @see ListSelectionModel#getMinSelectionIndex 1994 */ 1995 @BeanProperty(bound = false) 1996 public int getMinSelectionIndex() { 1997 return getSelectionModel().getMinSelectionIndex(); 1998 } 1999 2000 2001 /** 2002 * Returns the largest selected cell index, or {@code -1} if the selection 2003 * is empty. This is a cover method that delegates to the method of the same 2004 * name on the list's selection model. 2005 * 2006 * @return the largest selected cell index 2007 * @see ListSelectionModel#getMaxSelectionIndex 2008 */ 2009 @BeanProperty(bound = false) 2010 public int getMaxSelectionIndex() { 2011 return getSelectionModel().getMaxSelectionIndex(); 2012 } 2013 2014 2015 /** 2016 * Returns {@code true} if the specified index is selected, 2017 * else {@code false}. This is a cover method that delegates to the method 2018 * of the same name on the list's selection model. 2019 * 2020 * @param index index to be queried for selection state 2021 * @return {@code true} if the specified index is selected, 2022 * else {@code false} 2023 * @see ListSelectionModel#isSelectedIndex 2024 * @see #setSelectedIndex 2025 */ 2026 public boolean isSelectedIndex(int index) { 2027 return getSelectionModel().isSelectedIndex(index); 2028 } 2029 2030 2031 /** 2032 * Returns {@code true} if nothing is selected, else {@code false}. 2033 * This is a cover method that delegates to the method of the same 2034 * name on the list's selection model. 2035 * 2036 * @return {@code true} if nothing is selected, else {@code false} 2037 * @see ListSelectionModel#isSelectionEmpty 2038 * @see #clearSelection 2039 */ 2040 @BeanProperty(bound = false) 2041 public boolean isSelectionEmpty() { 2042 return getSelectionModel().isSelectionEmpty(); 2043 } 2044 2045 2046 /** 2047 * Clears the selection; after calling this method, {@code isSelectionEmpty} 2048 * will return {@code true}. This is a cover method that delegates to the 2049 * method of the same name on the list's selection model. 2050 * 2051 * @see ListSelectionModel#clearSelection 2052 * @see #isSelectionEmpty 2053 */ 2054 public void clearSelection() { 2055 getSelectionModel().clearSelection(); 2056 } 2057 2058 2059 /** 2060 * Selects the specified interval. Both {@code anchor} and {@code lead} 2061 * indices are included. {@code anchor} doesn't have to be less than or 2062 * equal to {@code lead}. This is a cover method that delegates to the 2063 * method of the same name on the list's selection model. 2064 * <p> 2065 * Refer to the documentation of the selection model class being used 2066 * for details on how values less than {@code 0} are handled. 2067 * 2068 * @param anchor the first index to select 2069 * @param lead the last index to select 2070 * @see ListSelectionModel#setSelectionInterval 2071 * @see DefaultListSelectionModel#setSelectionInterval 2072 * @see #createSelectionModel 2073 * @see #addSelectionInterval 2074 * @see #removeSelectionInterval 2075 */ 2076 public void setSelectionInterval(int anchor, int lead) { 2077 getSelectionModel().setSelectionInterval(anchor, lead); 2078 } 2079 2080 2081 /** 2082 * Sets the selection to be the union of the specified interval with current 2083 * selection. Both the {@code anchor} and {@code lead} indices are 2084 * included. {@code anchor} doesn't have to be less than or 2085 * equal to {@code lead}. This is a cover method that delegates to the 2086 * method of the same name on the list's selection model. 2087 * <p> 2088 * Refer to the documentation of the selection model class being used 2089 * for details on how values less than {@code 0} are handled. 2090 * 2091 * @param anchor the first index to add to the selection 2092 * @param lead the last index to add to the selection 2093 * @see ListSelectionModel#addSelectionInterval 2094 * @see DefaultListSelectionModel#addSelectionInterval 2095 * @see #createSelectionModel 2096 * @see #setSelectionInterval 2097 * @see #removeSelectionInterval 2098 */ 2099 public void addSelectionInterval(int anchor, int lead) { 2100 getSelectionModel().addSelectionInterval(anchor, lead); 2101 } 2102 2103 2104 /** 2105 * Sets the selection to be the set difference of the specified interval 2106 * and the current selection. Both the {@code index0} and {@code index1} 2107 * indices are removed. {@code index0} doesn't have to be less than or 2108 * equal to {@code index1}. This is a cover method that delegates to the 2109 * method of the same name on the list's selection model. 2110 * <p> 2111 * Refer to the documentation of the selection model class being used 2112 * for details on how values less than {@code 0} are handled. 2113 * 2114 * @param index0 the first index to remove from the selection 2115 * @param index1 the last index to remove from the selection 2116 * @see ListSelectionModel#removeSelectionInterval 2117 * @see DefaultListSelectionModel#removeSelectionInterval 2118 * @see #createSelectionModel 2119 * @see #setSelectionInterval 2120 * @see #addSelectionInterval 2121 */ 2122 public void removeSelectionInterval(int index0, int index1) { 2123 getSelectionModel().removeSelectionInterval(index0, index1); 2124 } 2125 2126 2127 /** 2128 * Sets the selection model's {@code valueIsAdjusting} property. When 2129 * {@code true}, upcoming changes to selection should be considered part 2130 * of a single change. This property is used internally and developers 2131 * typically need not call this method. For example, when the model is being 2132 * updated in response to a user drag, the value of the property is set 2133 * to {@code true} when the drag is initiated and set to {@code false} 2134 * when the drag is finished. This allows listeners to update only 2135 * when a change has been finalized, rather than handling all of the 2136 * intermediate values. 2137 * <p> 2138 * You may want to use this directly if making a series of changes 2139 * that should be considered part of a single change. 2140 * <p> 2141 * This is a cover method that delegates to the method of the same name on 2142 * the list's selection model. See the documentation for 2143 * {@link javax.swing.ListSelectionModel#setValueIsAdjusting} for 2144 * more details. 2145 * 2146 * @param b the new value for the property 2147 * @see ListSelectionModel#setValueIsAdjusting 2148 * @see javax.swing.event.ListSelectionEvent#getValueIsAdjusting 2149 * @see #getValueIsAdjusting 2150 */ 2151 public void setValueIsAdjusting(boolean b) { 2152 getSelectionModel().setValueIsAdjusting(b); 2153 } 2154 2155 2156 /** 2157 * Returns the value of the selection model's {@code isAdjusting} property. 2158 * <p> 2159 * This is a cover method that delegates to the method of the same name on 2160 * the list's selection model. 2161 * 2162 * @return the value of the selection model's {@code isAdjusting} property. 2163 * 2164 * @see #setValueIsAdjusting 2165 * @see ListSelectionModel#getValueIsAdjusting 2166 */ 2167 public boolean getValueIsAdjusting() { 2168 return getSelectionModel().getValueIsAdjusting(); 2169 } 2170 2171 2172 /** 2173 * Returns an array of all of the selected indices, in increasing 2174 * order. 2175 * 2176 * @return all of the selected indices, in increasing order, 2177 * or an empty array if nothing is selected 2178 * @see #removeSelectionInterval 2179 * @see #addListSelectionListener 2180 */ 2181 @Transient 2182 public int[] getSelectedIndices() { 2183 ListSelectionModel sm = getSelectionModel(); 2184 int iMin = sm.getMinSelectionIndex(); 2185 int iMax = sm.getMaxSelectionIndex(); 2186 2187 if ((iMin < 0) || (iMax < 0)) { 2188 return new int[0]; 2189 } 2190 2191 int[] rvTmp = new int[1+ (iMax - iMin)]; 2192 int n = 0; 2193 for(int i = iMin; i <= iMax; i++) { 2194 if (sm.isSelectedIndex(i)) { 2195 rvTmp[n++] = i; 2196 } 2197 } 2198 int[] rv = new int[n]; 2199 System.arraycopy(rvTmp, 0, rv, 0, n); 2200 return rv; 2201 } 2202 2203 2204 /** 2205 * Selects a single cell. Does nothing if the given index is greater 2206 * than or equal to the model size. This is a convenience method that uses 2207 * {@code setSelectionInterval} on the selection model. Refer to the 2208 * documentation for the selection model class being used for details on 2209 * how values less than {@code 0} are handled. 2210 * 2211 * @param index the index of the cell to select 2212 * @see ListSelectionModel#setSelectionInterval 2213 * @see #isSelectedIndex 2214 * @see #addListSelectionListener 2215 */ 2216 @BeanProperty(bound = false, description 2217 = "The index of the selected cell.") 2218 public void setSelectedIndex(int index) { 2219 if (index >= getModel().getSize()) { 2220 return; 2221 } 2222 getSelectionModel().setSelectionInterval(index, index); 2223 } 2224 2225 2226 /** 2227 * Changes the selection to be the set of indices specified by the given 2228 * array. Indices greater than or equal to the model size are ignored. 2229 * This is a convenience method that clears the selection and then uses 2230 * {@code addSelectionInterval} on the selection model to add the indices. 2231 * Refer to the documentation of the selection model class being used for 2232 * details on how values less than {@code 0} are handled. 2233 * 2234 * @param indices an array of the indices of the cells to select, 2235 * {@code non-null} 2236 * @see ListSelectionModel#addSelectionInterval 2237 * @see #isSelectedIndex 2238 * @see #addListSelectionListener 2239 * @throws NullPointerException if the given array is {@code null} 2240 */ 2241 public void setSelectedIndices(int[] indices) { 2242 ListSelectionModel sm = getSelectionModel(); 2243 sm.clearSelection(); 2244 int size = getModel().getSize(); 2245 for (int i : indices) { 2246 if (i < size) { 2247 sm.addSelectionInterval(i, i); 2248 } 2249 } 2250 } 2251 2252 2253 /** 2254 * Returns an array of all the selected values, in increasing order based 2255 * on their indices in the list. 2256 * 2257 * @return the selected values, or an empty array if nothing is selected 2258 * @see #isSelectedIndex 2259 * @see #getModel 2260 * @see #addListSelectionListener 2261 * 2262 * @deprecated As of JDK 1.7, replaced by {@link #getSelectedValuesList()} 2263 */ 2264 @Deprecated 2265 @BeanProperty(bound = false) 2266 public Object[] getSelectedValues() { 2267 ListSelectionModel sm = getSelectionModel(); 2268 ListModel<E> dm = getModel(); 2269 2270 int iMin = sm.getMinSelectionIndex(); 2271 int iMax = sm.getMaxSelectionIndex(); 2272 2273 if ((iMin < 0) || (iMax < 0)) { 2274 return new Object[0]; 2275 } 2276 2277 Object[] rvTmp = new Object[1+ (iMax - iMin)]; 2278 int n = 0; 2279 for(int i = iMin; i <= iMax; i++) { 2280 if (sm.isSelectedIndex(i)) { 2281 rvTmp[n++] = dm.getElementAt(i); 2282 } 2283 } 2284 Object[] rv = new Object[n]; 2285 System.arraycopy(rvTmp, 0, rv, 0, n); 2286 return rv; 2287 } 2288 2289 /** 2290 * Returns a list of all the selected items, in increasing order based 2291 * on their indices in the list. 2292 * 2293 * @return the selected items, or an empty list if nothing is selected 2294 * @see #isSelectedIndex 2295 * @see #getModel 2296 * @see #addListSelectionListener 2297 * 2298 * @since 1.7 2299 */ 2300 @BeanProperty(bound = false) 2301 public List<E> getSelectedValuesList() { 2302 ListSelectionModel sm = getSelectionModel(); 2303 ListModel<E> dm = getModel(); 2304 2305 int iMin = sm.getMinSelectionIndex(); 2306 int iMax = sm.getMaxSelectionIndex(); 2307 2308 if ((iMin < 0) || (iMax < 0)) { 2309 return Collections.emptyList(); 2310 } 2311 2312 List<E> selectedItems = new ArrayList<E>(); 2313 for(int i = iMin; i <= iMax; i++) { 2314 if (sm.isSelectedIndex(i)) { 2315 selectedItems.add(dm.getElementAt(i)); 2316 } 2317 } 2318 return selectedItems; 2319 } 2320 2321 2322 /** 2323 * Returns the smallest selected cell index; <i>the selection</i> when only 2324 * a single item is selected in the list. When multiple items are selected, 2325 * it is simply the smallest selected index. Returns {@code -1} if there is 2326 * no selection. 2327 * <p> 2328 * This method is a cover that delegates to {@code getMinSelectionIndex}. 2329 * 2330 * @return the smallest selected cell index 2331 * @see #getMinSelectionIndex 2332 * @see #addListSelectionListener 2333 */ 2334 public int getSelectedIndex() { 2335 return getMinSelectionIndex(); 2336 } 2337 2338 2339 /** 2340 * Returns the value for the smallest selected cell index; 2341 * <i>the selected value</i> when only a single item is selected in the 2342 * list. When multiple items are selected, it is simply the value for the 2343 * smallest selected index. Returns {@code null} if there is no selection. 2344 * <p> 2345 * This is a convenience method that simply returns the model value for 2346 * {@code getMinSelectionIndex}. 2347 * 2348 * @return the first selected value 2349 * @see #getMinSelectionIndex 2350 * @see #getModel 2351 * @see #addListSelectionListener 2352 */ 2353 @BeanProperty(bound = false) 2354 public E getSelectedValue() { 2355 int i = getMinSelectionIndex(); 2356 return (i == -1) ? null : getModel().getElementAt(i); 2357 } 2358 2359 2360 /** 2361 * Selects the specified object from the list. 2362 * If the object passed is not present in the list, the selection is 2363 * cleared. 2364 * 2365 * @param anObject the object to select 2366 * @param shouldScroll {@code true} if the list should scroll to display 2367 * the selected object, if one exists; otherwise {@code false} 2368 */ 2369 public void setSelectedValue(Object anObject,boolean shouldScroll) { 2370 E selectedValue = getSelectedValue(); 2371 //This will be true if both anObject and selectedObject are either 2372 // null or point to objects which return true on calling equals 2373 if((anObject == selectedValue) || 2374 (anObject != null && anObject.equals(selectedValue))) { 2375 return; 2376 } else { 2377 int i,c; 2378 ListModel<E> dm = getModel(); 2379 for(i=0,c=dm.getSize();i<c;i++) { 2380 Object object = dm.getElementAt(i); 2381 //Either both should be null or reference to objects which 2382 // return true with equals method 2383 if ((anObject == object) || 2384 anObject!= null && anObject.equals(object)) { 2385 setSelectedIndex(i); 2386 if (shouldScroll) 2387 ensureIndexIsVisible(i); 2388 repaint(); /** FIX-ME setSelectedIndex does not redraw all the time with the basic l&f**/ 2389 return; 2390 } 2391 } 2392 clearSelection(); 2393 } 2394 repaint(); /** FIX-ME setSelectedIndex does not redraw all the time with the basic l&f**/ 2395 } 2396 2397 2398 2399 /** 2400 * --- The Scrollable Implementation --- 2401 */ 2402 2403 private void checkScrollableParameters(Rectangle visibleRect, int orientation) { 2404 if (visibleRect == null) { 2405 throw new IllegalArgumentException("visibleRect must be non-null"); 2406 } 2407 switch (orientation) { 2408 case SwingConstants.VERTICAL: 2409 case SwingConstants.HORIZONTAL: 2410 break; 2411 default: 2412 throw new IllegalArgumentException("orientation must be one of: VERTICAL, HORIZONTAL"); 2413 } 2414 } 2415 2416 2417 /** 2418 * Computes the size of viewport needed to display {@code visibleRowCount} 2419 * rows. The value returned by this method depends on the layout 2420 * orientation: 2421 * <p> 2422 * <b>{@code VERTICAL}:</b> 2423 * <br> 2424 * This is trivial if both {@code fixedCellWidth} and {@code fixedCellHeight} 2425 * have been set (either explicitly or by specifying a prototype cell value). 2426 * The width is simply the {@code fixedCellWidth} plus the list's horizontal 2427 * insets. The height is the {@code fixedCellHeight} multiplied by the 2428 * {@code visibleRowCount}, plus the list's vertical insets. 2429 * <p> 2430 * If either {@code fixedCellWidth} or {@code fixedCellHeight} haven't been 2431 * specified, heuristics are used. If the model is empty, the width is 2432 * the {@code fixedCellWidth}, if greater than {@code 0}, or a hard-coded 2433 * value of {@code 256}. The height is the {@code fixedCellHeight} multiplied 2434 * by {@code visibleRowCount}, if {@code fixedCellHeight} is greater than 2435 * {@code 0}, otherwise it is a hard-coded value of {@code 16} multiplied by 2436 * {@code visibleRowCount}. 2437 * <p> 2438 * If the model isn't empty, the width is the preferred size's width, 2439 * typically the width of the widest list element. The height is the 2440 * {@code fixedCellHeight} multiplied by the {@code visibleRowCount}, 2441 * plus the list's vertical insets. 2442 * <p> 2443 * <b>{@code VERTICAL_WRAP} or {@code HORIZONTAL_WRAP}:</b> 2444 * <br> 2445 * This method simply returns the value from {@code getPreferredSize}. 2446 * The list's {@code ListUI} is expected to override {@code getPreferredSize} 2447 * to return an appropriate value. 2448 * 2449 * @return a dimension containing the size of the viewport needed 2450 * to display {@code visibleRowCount} rows 2451 * @see #getPreferredScrollableViewportSize 2452 * @see #setPrototypeCellValue 2453 */ 2454 @BeanProperty(bound = false) 2455 public Dimension getPreferredScrollableViewportSize() 2456 { 2457 if (getLayoutOrientation() != VERTICAL) { 2458 return getPreferredSize(); 2459 } 2460 Insets insets = getInsets(); 2461 int dx = insets.left + insets.right; 2462 int dy = insets.top + insets.bottom; 2463 2464 int visibleRowCount = getVisibleRowCount(); 2465 int fixedCellWidth = getFixedCellWidth(); 2466 int fixedCellHeight = getFixedCellHeight(); 2467 2468 if ((fixedCellWidth > 0) && (fixedCellHeight > 0)) { 2469 int width = fixedCellWidth + dx; 2470 int height = (visibleRowCount * fixedCellHeight) + dy; 2471 return new Dimension(width, height); 2472 } 2473 else if (getModel().getSize() > 0) { 2474 int width = getPreferredSize().width; 2475 int height; 2476 Rectangle r = getCellBounds(0, 0); 2477 if (r != null) { 2478 height = (visibleRowCount * r.height) + dy; 2479 } 2480 else { 2481 // Will only happen if UI null, shouldn't matter what we return 2482 height = 1; 2483 } 2484 return new Dimension(width, height); 2485 } 2486 else { 2487 fixedCellWidth = (fixedCellWidth > 0) ? fixedCellWidth : 256; 2488 fixedCellHeight = (fixedCellHeight > 0) ? fixedCellHeight : 16; 2489 return new Dimension(fixedCellWidth, fixedCellHeight * visibleRowCount); 2490 } 2491 } 2492 2493 2494 /** 2495 * Returns the distance to scroll to expose the next or previous 2496 * row (for vertical scrolling) or column (for horizontal scrolling). 2497 * <p> 2498 * For horizontal scrolling, if the layout orientation is {@code VERTICAL}, 2499 * then the list's font size is returned (or {@code 1} if the font is 2500 * {@code null}). 2501 * 2502 * @param visibleRect the view area visible within the viewport 2503 * @param orientation {@code SwingConstants.HORIZONTAL} or 2504 * {@code SwingConstants.VERTICAL} 2505 * @param direction less or equal to zero to scroll up/back, 2506 * greater than zero for down/forward 2507 * @return the "unit" increment for scrolling in the specified direction; 2508 * always positive 2509 * @see #getScrollableBlockIncrement 2510 * @see Scrollable#getScrollableUnitIncrement 2511 * @throws IllegalArgumentException if {@code visibleRect} is {@code null}, or 2512 * {@code orientation} isn't one of {@code SwingConstants.VERTICAL} or 2513 * {@code SwingConstants.HORIZONTAL} 2514 */ 2515 public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) 2516 { 2517 checkScrollableParameters(visibleRect, orientation); 2518 2519 if (orientation == SwingConstants.VERTICAL) { 2520 int row = locationToIndex(visibleRect.getLocation()); 2521 2522 if (row == -1) { 2523 return 0; 2524 } 2525 else { 2526 /* Scroll Down */ 2527 if (direction > 0) { 2528 Rectangle r = getCellBounds(row, row); 2529 return (r == null) ? 0 : r.height - (visibleRect.y - r.y); 2530 } 2531 /* Scroll Up */ 2532 else { 2533 Rectangle r = getCellBounds(row, row); 2534 2535 /* The first row is completely visible and it's row 0. 2536 * We're done. 2537 */ 2538 if ((r.y == visibleRect.y) && (row == 0)) { 2539 return 0; 2540 } 2541 /* The first row is completely visible, return the 2542 * height of the previous row or 0 if the first row 2543 * is the top row of the list. 2544 */ 2545 else if (r.y == visibleRect.y) { 2546 Point loc = r.getLocation(); 2547 loc.y--; 2548 int prevIndex = locationToIndex(loc); 2549 Rectangle prevR = getCellBounds(prevIndex, prevIndex); 2550 2551 if (prevR == null || prevR.y >= r.y) { 2552 return 0; 2553 } 2554 return prevR.height; 2555 } 2556 /* The first row is partially visible, return the 2557 * height of hidden part. 2558 */ 2559 else { 2560 return visibleRect.y - r.y; 2561 } 2562 } 2563 } 2564 } else if (orientation == SwingConstants.HORIZONTAL && 2565 getLayoutOrientation() != JList.VERTICAL) { 2566 boolean leftToRight = getComponentOrientation().isLeftToRight(); 2567 int index; 2568 Point leadingPoint; 2569 2570 if (leftToRight) { 2571 leadingPoint = visibleRect.getLocation(); 2572 } 2573 else { 2574 leadingPoint = new Point(visibleRect.x + visibleRect.width -1, 2575 visibleRect.y); 2576 } 2577 index = locationToIndex(leadingPoint); 2578 2579 if (index != -1) { 2580 Rectangle cellBounds = getCellBounds(index, index); 2581 if (cellBounds != null && cellBounds.contains(leadingPoint)) { 2582 int leadingVisibleEdge; 2583 int leadingCellEdge; 2584 2585 if (leftToRight) { 2586 leadingVisibleEdge = visibleRect.x; 2587 leadingCellEdge = cellBounds.x; 2588 } 2589 else { 2590 leadingVisibleEdge = visibleRect.x + visibleRect.width; 2591 leadingCellEdge = cellBounds.x + cellBounds.width; 2592 } 2593 2594 if (leadingCellEdge != leadingVisibleEdge) { 2595 if (direction < 0) { 2596 // Show remainder of leading cell 2597 return Math.abs(leadingVisibleEdge - leadingCellEdge); 2598 2599 } 2600 else if (leftToRight) { 2601 // Hide rest of leading cell 2602 return leadingCellEdge + cellBounds.width - leadingVisibleEdge; 2603 } 2604 else { 2605 // Hide rest of leading cell 2606 return leadingVisibleEdge - cellBounds.x; 2607 } 2608 } 2609 // ASSUME: All cells are the same width 2610 return cellBounds.width; 2611 } 2612 } 2613 } 2614 Font f = getFont(); 2615 return (f != null) ? f.getSize() : 1; 2616 } 2617 2618 2619 /** 2620 * Returns the distance to scroll to expose the next or previous block. 2621 * <p> 2622 * For vertical scrolling, the following rules are used: 2623 * <ul> 2624 * <li>if scrolling down, returns the distance to scroll so that the last 2625 * visible element becomes the first completely visible element 2626 * <li>if scrolling up, returns the distance to scroll so that the first 2627 * visible element becomes the last completely visible element 2628 * <li>returns {@code visibleRect.height} if the list is empty 2629 * </ul> 2630 * <p> 2631 * For horizontal scrolling, when the layout orientation is either 2632 * {@code VERTICAL_WRAP} or {@code HORIZONTAL_WRAP}: 2633 * <ul> 2634 * <li>if scrolling right, returns the distance to scroll so that the 2635 * last visible element becomes 2636 * the first completely visible element 2637 * <li>if scrolling left, returns the distance to scroll so that the first 2638 * visible element becomes the last completely visible element 2639 * <li>returns {@code visibleRect.width} if the list is empty 2640 * </ul> 2641 * <p> 2642 * For horizontal scrolling and {@code VERTICAL} orientation, 2643 * returns {@code visibleRect.width}. 2644 * <p> 2645 * Note that the value of {@code visibleRect} must be the equal to 2646 * {@code this.getVisibleRect()}. 2647 * 2648 * @param visibleRect the view area visible within the viewport 2649 * @param orientation {@code SwingConstants.HORIZONTAL} or 2650 * {@code SwingConstants.VERTICAL} 2651 * @param direction less or equal to zero to scroll up/back, 2652 * greater than zero for down/forward 2653 * @return the "block" increment for scrolling in the specified direction; 2654 * always positive 2655 * @see #getScrollableUnitIncrement 2656 * @see Scrollable#getScrollableBlockIncrement 2657 * @throws IllegalArgumentException if {@code visibleRect} is {@code null}, or 2658 * {@code orientation} isn't one of {@code SwingConstants.VERTICAL} or 2659 * {@code SwingConstants.HORIZONTAL} 2660 */ 2661 public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) { 2662 checkScrollableParameters(visibleRect, orientation); 2663 if (orientation == SwingConstants.VERTICAL) { 2664 int inc = visibleRect.height; 2665 /* Scroll Down */ 2666 if (direction > 0) { 2667 // last cell is the lowest left cell 2668 int last = locationToIndex(new Point(visibleRect.x, visibleRect.y+visibleRect.height-1)); 2669 if (last != -1) { 2670 Rectangle lastRect = getCellBounds(last,last); 2671 if (lastRect != null) { 2672 inc = lastRect.y - visibleRect.y; 2673 if ( (inc == 0) && (last < getModel().getSize()-1) ) { 2674 inc = lastRect.height; 2675 } 2676 } 2677 } 2678 } 2679 /* Scroll Up */ 2680 else { 2681 int newFirst = locationToIndex(new Point(visibleRect.x, visibleRect.y-visibleRect.height)); 2682 int first = getFirstVisibleIndex(); 2683 if (newFirst != -1) { 2684 if (first == -1) { 2685 first = locationToIndex(visibleRect.getLocation()); 2686 } 2687 Rectangle newFirstRect = getCellBounds(newFirst,newFirst); 2688 Rectangle firstRect = getCellBounds(first,first); 2689 if ((newFirstRect != null) && (firstRect!=null)) { 2690 while ( (newFirstRect.y + visibleRect.height < 2691 firstRect.y + firstRect.height) && 2692 (newFirstRect.y < firstRect.y) ) { 2693 newFirst++; 2694 newFirstRect = getCellBounds(newFirst,newFirst); 2695 } 2696 inc = visibleRect.y - newFirstRect.y; 2697 if ( (inc <= 0) && (newFirstRect.y > 0)) { 2698 newFirst--; 2699 newFirstRect = getCellBounds(newFirst,newFirst); 2700 if (newFirstRect != null) { 2701 inc = visibleRect.y - newFirstRect.y; 2702 } 2703 } 2704 } 2705 } 2706 } 2707 return inc; 2708 } 2709 else if (orientation == SwingConstants.HORIZONTAL && 2710 getLayoutOrientation() != JList.VERTICAL) { 2711 boolean leftToRight = getComponentOrientation().isLeftToRight(); 2712 int inc = visibleRect.width; 2713 /* Scroll Right (in ltr mode) or Scroll Left (in rtl mode) */ 2714 if (direction > 0) { 2715 // position is upper right if ltr, or upper left otherwise 2716 int x = visibleRect.x + (leftToRight ? (visibleRect.width - 1) : 0); 2717 int last = locationToIndex(new Point(x, visibleRect.y)); 2718 2719 if (last != -1) { 2720 Rectangle lastRect = getCellBounds(last,last); 2721 if (lastRect != null) { 2722 if (leftToRight) { 2723 inc = lastRect.x - visibleRect.x; 2724 } else { 2725 inc = visibleRect.x + visibleRect.width 2726 - (lastRect.x + lastRect.width); 2727 } 2728 if (inc < 0) { 2729 inc += lastRect.width; 2730 } else if ( (inc == 0) && (last < getModel().getSize()-1) ) { 2731 inc = lastRect.width; 2732 } 2733 } 2734 } 2735 } 2736 /* Scroll Left (in ltr mode) or Scroll Right (in rtl mode) */ 2737 else { 2738 // position is upper left corner of the visibleRect shifted 2739 // left by the visibleRect.width if ltr, or upper right shifted 2740 // right by the visibleRect.width otherwise 2741 int x = visibleRect.x + (leftToRight 2742 ? -visibleRect.width 2743 : visibleRect.width - 1 + visibleRect.width); 2744 int first = locationToIndex(new Point(x, visibleRect.y)); 2745 2746 if (first != -1) { 2747 Rectangle firstRect = getCellBounds(first,first); 2748 if (firstRect != null) { 2749 // the right of the first cell 2750 int firstRight = firstRect.x + firstRect.width; 2751 2752 if (leftToRight) { 2753 if ((firstRect.x < visibleRect.x - visibleRect.width) 2754 && (firstRight < visibleRect.x)) { 2755 inc = visibleRect.x - firstRight; 2756 } else { 2757 inc = visibleRect.x - firstRect.x; 2758 } 2759 } else { 2760 int visibleRight = visibleRect.x + visibleRect.width; 2761 2762 if ((firstRight > visibleRight + visibleRect.width) 2763 && (firstRect.x > visibleRight)) { 2764 inc = firstRect.x - visibleRight; 2765 } else { 2766 inc = firstRight - visibleRight; 2767 } 2768 } 2769 } 2770 } 2771 } 2772 return inc; 2773 } 2774 return visibleRect.width; 2775 } 2776 2777 2778 /** 2779 * Returns {@code true} if this {@code JList} is displayed in a 2780 * {@code JViewport} and the viewport is wider than the list's 2781 * preferred width, or if the layout orientation is {@code HORIZONTAL_WRAP} 2782 * and {@code visibleRowCount <= 0}; otherwise returns {@code false}. 2783 * <p> 2784 * If {@code false}, then don't track the viewport's width. This allows 2785 * horizontal scrolling if the {@code JViewport} is itself embedded in a 2786 * {@code JScrollPane}. 2787 * 2788 * @return whether or not an enclosing viewport should force the list's 2789 * width to match its own 2790 * @see Scrollable#getScrollableTracksViewportWidth 2791 */ 2792 @BeanProperty(bound = false) 2793 public boolean getScrollableTracksViewportWidth() { 2794 if (getLayoutOrientation() == HORIZONTAL_WRAP && 2795 getVisibleRowCount() <= 0) { 2796 return true; 2797 } 2798 Container parent = SwingUtilities.getUnwrappedParent(this); 2799 if (parent instanceof JViewport) { 2800 return parent.getWidth() > getPreferredSize().width; 2801 } 2802 return false; 2803 } 2804 2805 /** 2806 * Returns {@code true} if this {@code JList} is displayed in a 2807 * {@code JViewport} and the viewport is taller than the list's 2808 * preferred height, or if the layout orientation is {@code VERTICAL_WRAP} 2809 * and {@code visibleRowCount <= 0}; otherwise returns {@code false}. 2810 * <p> 2811 * If {@code false}, then don't track the viewport's height. This allows 2812 * vertical scrolling if the {@code JViewport} is itself embedded in a 2813 * {@code JScrollPane}. 2814 * 2815 * @return whether or not an enclosing viewport should force the list's 2816 * height to match its own 2817 * @see Scrollable#getScrollableTracksViewportHeight 2818 */ 2819 @BeanProperty(bound = false) 2820 public boolean getScrollableTracksViewportHeight() { 2821 if (getLayoutOrientation() == VERTICAL_WRAP && 2822 getVisibleRowCount() <= 0) { 2823 return true; 2824 } 2825 Container parent = SwingUtilities.getUnwrappedParent(this); 2826 if (parent instanceof JViewport) { 2827 return parent.getHeight() > getPreferredSize().height; 2828 } 2829 return false; 2830 } 2831 2832 2833 /* 2834 * See {@code readObject} and {@code writeObject} in {@code JComponent} 2835 * for more information about serialization in Swing. 2836 */ 2837 private void writeObject(ObjectOutputStream s) throws IOException { 2838 s.defaultWriteObject(); 2839 if (getUIClassID().equals(uiClassID)) { 2840 byte count = JComponent.getWriteObjCounter(this); 2841 JComponent.setWriteObjCounter(this, --count); 2842 if (count == 0 && ui != null) { 2843 ui.installUI(this); 2844 } 2845 } 2846 } 2847 2848 2849 /** 2850 * Returns a {@code String} representation of this {@code JList}. 2851 * This method is intended to be used only for debugging purposes, 2852 * and the content and format of the returned {@code String} may vary 2853 * between implementations. The returned {@code String} may be empty, 2854 * but may not be {@code null}. 2855 * 2856 * @return a {@code String} representation of this {@code JList}. 2857 */ 2858 protected String paramString() { 2859 String selectionForegroundString = (selectionForeground != null ? 2860 selectionForeground.toString() : 2861 ""); 2862 String selectionBackgroundString = (selectionBackground != null ? 2863 selectionBackground.toString() : 2864 ""); 2865 2866 return super.paramString() + 2867 ",fixedCellHeight=" + fixedCellHeight + 2868 ",fixedCellWidth=" + fixedCellWidth + 2869 ",horizontalScrollIncrement=" + horizontalScrollIncrement + 2870 ",selectionBackground=" + selectionBackgroundString + 2871 ",selectionForeground=" + selectionForegroundString + 2872 ",visibleRowCount=" + visibleRowCount + 2873 ",layoutOrientation=" + layoutOrientation; 2874 } 2875 2876 2877 /** 2878 * --- Accessibility Support --- 2879 */ 2880 2881 /** 2882 * Gets the {@code AccessibleContext} associated with this {@code JList}. 2883 * For {@code JList}, the {@code AccessibleContext} takes the form of an 2884 * {@code AccessibleJList}. 2885 * <p> 2886 * A new {@code AccessibleJList} instance is created if necessary. 2887 * 2888 * @return an {@code AccessibleJList} that serves as the 2889 * {@code AccessibleContext} of this {@code JList} 2890 */ 2891 @BeanProperty(bound = false) 2892 public AccessibleContext getAccessibleContext() { 2893 if (accessibleContext == null) { 2894 accessibleContext = new AccessibleJList(); 2895 } 2896 return accessibleContext; 2897 } 2898 2899 /** 2900 * This class implements accessibility support for the 2901 * {@code JList} class. It provides an implementation of the 2902 * Java Accessibility API appropriate to list user-interface 2903 * elements. 2904 * <p> 2905 * <strong>Warning:</strong> 2906 * Serialized objects of this class will not be compatible with 2907 * future Swing releases. The current serialization support is 2908 * appropriate for short term storage or RMI between applications running 2909 * the same version of Swing. As of 1.4, support for long term storage 2910 * of all JavaBeans™ 2911 * has been added to the <code>java.beans</code> package. 2912 * Please see {@link java.beans.XMLEncoder}. 2913 */ 2914 @SuppressWarnings("serial") // Same-version serialization only 2915 protected class AccessibleJList extends AccessibleJComponent 2916 implements AccessibleSelection, PropertyChangeListener, 2917 ListSelectionListener, ListDataListener { 2918 2919 int leadSelectionIndex; 2920 2921 /** 2922 * Constructs an {@code AccessibleJList}. 2923 */ 2924 public AccessibleJList() { 2925 super(); 2926 JList.this.addPropertyChangeListener(this); 2927 JList.this.getSelectionModel().addListSelectionListener(this); 2928 JList.this.getModel().addListDataListener(this); 2929 leadSelectionIndex = JList.this.getLeadSelectionIndex(); 2930 } 2931 2932 /** 2933 * Property Change Listener change method. Used to track changes 2934 * to the DataModel and ListSelectionModel, in order to re-set 2935 * listeners to those for reporting changes there via the Accessibility 2936 * PropertyChange mechanism. 2937 * 2938 * @param e PropertyChangeEvent 2939 */ 2940 public void propertyChange(PropertyChangeEvent e) { 2941 String name = e.getPropertyName(); 2942 Object oldValue = e.getOldValue(); 2943 Object newValue = e.getNewValue(); 2944 2945 // re-set listData listeners 2946 if (name.compareTo("model") == 0) { 2947 2948 if (oldValue != null && oldValue instanceof ListModel) { 2949 ((ListModel) oldValue).removeListDataListener(this); 2950 } 2951 if (newValue != null && newValue instanceof ListModel) { 2952 ((ListModel) newValue).addListDataListener(this); 2953 } 2954 2955 // re-set listSelectionModel listeners 2956 } else if (name.compareTo("selectionModel") == 0) { 2957 2958 if (oldValue != null && oldValue instanceof ListSelectionModel) { 2959 ((ListSelectionModel) oldValue).removeListSelectionListener(this); 2960 } 2961 if (newValue != null && newValue instanceof ListSelectionModel) { 2962 ((ListSelectionModel) newValue).addListSelectionListener(this); 2963 } 2964 2965 firePropertyChange( 2966 AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY, 2967 Boolean.valueOf(false), Boolean.valueOf(true)); 2968 } 2969 } 2970 2971 /** 2972 * List Selection Listener value change method. Used to fire 2973 * the property change 2974 * 2975 * @param e ListSelectionEvent 2976 * 2977 */ 2978 public void valueChanged(ListSelectionEvent e) { 2979 int oldLeadSelectionIndex = leadSelectionIndex; 2980 leadSelectionIndex = JList.this.getLeadSelectionIndex(); 2981 if (oldLeadSelectionIndex != leadSelectionIndex) { 2982 Accessible oldLS, newLS; 2983 oldLS = (oldLeadSelectionIndex >= 0) 2984 ? getAccessibleChild(oldLeadSelectionIndex) 2985 : null; 2986 newLS = (leadSelectionIndex >= 0) 2987 ? getAccessibleChild(leadSelectionIndex) 2988 : null; 2989 firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, 2990 oldLS, newLS); 2991 } 2992 2993 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY, 2994 Boolean.valueOf(false), Boolean.valueOf(true)); 2995 firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY, 2996 Boolean.valueOf(false), Boolean.valueOf(true)); 2997 2998 // Process the State changes for Multiselectable 2999 AccessibleStateSet s = getAccessibleStateSet(); 3000 ListSelectionModel lsm = JList.this.getSelectionModel(); 3001 if (lsm.getSelectionMode() != ListSelectionModel.SINGLE_SELECTION) { 3002 if (!s.contains(AccessibleState.MULTISELECTABLE)) { 3003 s.add(AccessibleState.MULTISELECTABLE); 3004 firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 3005 null, AccessibleState.MULTISELECTABLE); 3006 } 3007 } else { 3008 if (s.contains(AccessibleState.MULTISELECTABLE)) { 3009 s.remove(AccessibleState.MULTISELECTABLE); 3010 firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 3011 AccessibleState.MULTISELECTABLE, null); 3012 } 3013 } 3014 } 3015 3016 /** 3017 * List Data Listener interval added method. Used to fire the visible data property change 3018 * 3019 * @param e ListDataEvent 3020 * 3021 */ 3022 public void intervalAdded(ListDataEvent e) { 3023 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY, 3024 Boolean.valueOf(false), Boolean.valueOf(true)); 3025 } 3026 3027 /** 3028 * List Data Listener interval removed method. Used to fire the visible data property change 3029 * 3030 * @param e ListDataEvent 3031 * 3032 */ 3033 public void intervalRemoved(ListDataEvent e) { 3034 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY, 3035 Boolean.valueOf(false), Boolean.valueOf(true)); 3036 } 3037 3038 /** 3039 * List Data Listener contents changed method. Used to fire the visible data property change 3040 * 3041 * @param e ListDataEvent 3042 * 3043 */ 3044 public void contentsChanged(ListDataEvent e) { 3045 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY, 3046 Boolean.valueOf(false), Boolean.valueOf(true)); 3047 } 3048 3049 // AccessibleContext methods 3050 3051 /** 3052 * Get the state set of this object. 3053 * 3054 * @return an instance of AccessibleState containing the current state 3055 * of the object 3056 * @see AccessibleState 3057 */ 3058 public AccessibleStateSet getAccessibleStateSet() { 3059 AccessibleStateSet states = super.getAccessibleStateSet(); 3060 if (selectionModel.getSelectionMode() != 3061 ListSelectionModel.SINGLE_SELECTION) { 3062 states.add(AccessibleState.MULTISELECTABLE); 3063 } 3064 return states; 3065 } 3066 3067 /** 3068 * Get the role of this object. 3069 * 3070 * @return an instance of AccessibleRole describing the role of the 3071 * object 3072 * @see AccessibleRole 3073 */ 3074 public AccessibleRole getAccessibleRole() { 3075 return AccessibleRole.LIST; 3076 } 3077 3078 /** 3079 * Returns the <code>Accessible</code> child contained at 3080 * the local coordinate <code>Point</code>, if one exists. 3081 * Otherwise returns <code>null</code>. 3082 * 3083 * @return the <code>Accessible</code> at the specified 3084 * location, if it exists 3085 */ 3086 public Accessible getAccessibleAt(Point p) { 3087 int i = locationToIndex(p); 3088 if (i >= 0) { 3089 return new AccessibleJListChild(JList.this, i); 3090 } else { 3091 return null; 3092 } 3093 } 3094 3095 /** 3096 * Returns the number of accessible children in the object. If all 3097 * of the children of this object implement Accessible, than this 3098 * method should return the number of children of this object. 3099 * 3100 * @return the number of accessible children in the object. 3101 */ 3102 public int getAccessibleChildrenCount() { 3103 return getModel().getSize(); 3104 } 3105 3106 /** 3107 * Return the nth Accessible child of the object. 3108 * 3109 * @param i zero-based index of child 3110 * @return the nth Accessible child of the object 3111 */ 3112 public Accessible getAccessibleChild(int i) { 3113 if (i >= getModel().getSize()) { 3114 return null; 3115 } else { 3116 return new AccessibleJListChild(JList.this, i); 3117 } 3118 } 3119 3120 /** 3121 * Get the AccessibleSelection associated with this object. In the 3122 * implementation of the Java Accessibility API for this class, 3123 * return this object, which is responsible for implementing the 3124 * AccessibleSelection interface on behalf of itself. 3125 * 3126 * @return this object 3127 */ 3128 public AccessibleSelection getAccessibleSelection() { 3129 return this; 3130 } 3131 3132 3133 // AccessibleSelection methods 3134 3135 /** 3136 * Returns the number of items currently selected. 3137 * If no items are selected, the return value will be 0. 3138 * 3139 * @return the number of items currently selected. 3140 */ 3141 public int getAccessibleSelectionCount() { 3142 return JList.this.getSelectedIndices().length; 3143 } 3144 3145 /** 3146 * Returns an Accessible representing the specified selected item 3147 * in the object. If there isn't a selection, or there are 3148 * fewer items selected than the integer passed in, the return 3149 * value will be <code>null</code>. 3150 * 3151 * @param i the zero-based index of selected items 3152 * @return an Accessible containing the selected item 3153 */ 3154 public Accessible getAccessibleSelection(int i) { 3155 int len = getAccessibleSelectionCount(); 3156 if (i < 0 || i >= len) { 3157 return null; 3158 } else { 3159 return getAccessibleChild(JList.this.getSelectedIndices()[i]); 3160 } 3161 } 3162 3163 /** 3164 * Returns true if the current child of this object is selected. 3165 * 3166 * @param i the zero-based index of the child in this Accessible 3167 * object. 3168 * @see AccessibleContext#getAccessibleChild 3169 */ 3170 public boolean isAccessibleChildSelected(int i) { 3171 return isSelectedIndex(i); 3172 } 3173 3174 /** 3175 * Adds the specified selected item in the object to the object's 3176 * selection. If the object supports multiple selections, 3177 * the specified item is added to any existing selection, otherwise 3178 * it replaces any existing selection in the object. If the 3179 * specified item is already selected, this method has no effect. 3180 * 3181 * @param i the zero-based index of selectable items 3182 */ 3183 public void addAccessibleSelection(int i) { 3184 JList.this.addSelectionInterval(i, i); 3185 } 3186 3187 /** 3188 * Removes the specified selected item in the object from the object's 3189 * selection. If the specified item isn't currently selected, this 3190 * method has no effect. 3191 * 3192 * @param i the zero-based index of selectable items 3193 */ 3194 public void removeAccessibleSelection(int i) { 3195 JList.this.removeSelectionInterval(i, i); 3196 } 3197 3198 /** 3199 * Clears the selection in the object, so that nothing in the 3200 * object is selected. 3201 */ 3202 public void clearAccessibleSelection() { 3203 JList.this.clearSelection(); 3204 } 3205 3206 /** 3207 * Causes every selected item in the object to be selected 3208 * if the object supports multiple selections. 3209 */ 3210 public void selectAllAccessibleSelection() { 3211 JList.this.addSelectionInterval(0, getAccessibleChildrenCount() -1); 3212 } 3213 3214 /** 3215 * This class implements accessibility support appropriate 3216 * for list children. 3217 */ 3218 protected class AccessibleJListChild extends AccessibleContext 3219 implements Accessible, AccessibleComponent, AccessibleAction { 3220 private JList<E> parent = null; 3221 int indexInParent; 3222 private Component component = null; 3223 private AccessibleContext accessibleContext = null; 3224 private ListModel<E> listModel; 3225 private ListCellRenderer<? super E> cellRenderer = null; 3226 3227 /** 3228 * Constructs an {@code AccessibleJListChild}. 3229 * @param parent the parent 3230 * @param indexInParent the index in the parent 3231 */ 3232 public AccessibleJListChild(JList<E> parent, int indexInParent) { 3233 this.parent = parent; 3234 this.setAccessibleParent(parent); 3235 this.indexInParent = indexInParent; 3236 if (parent != null) { 3237 listModel = parent.getModel(); 3238 cellRenderer = parent.getCellRenderer(); 3239 } 3240 } 3241 3242 private Component getCurrentComponent() { 3243 return getComponentAtIndex(indexInParent); 3244 } 3245 3246 AccessibleContext getCurrentAccessibleContext() { 3247 Component c = getComponentAtIndex(indexInParent); 3248 if (c instanceof Accessible) { 3249 return c.getAccessibleContext(); 3250 } else { 3251 return null; 3252 } 3253 } 3254 3255 private Component getComponentAtIndex(int index) { 3256 if (index < 0 || index >= listModel.getSize()) { 3257 return null; 3258 } 3259 if ((parent != null) 3260 && (listModel != null) 3261 && cellRenderer != null) { 3262 E value = listModel.getElementAt(index); 3263 boolean isSelected = parent.isSelectedIndex(index); 3264 boolean isFocussed = parent.isFocusOwner() 3265 && (index == parent.getLeadSelectionIndex()); 3266 return cellRenderer.getListCellRendererComponent( 3267 parent, 3268 value, 3269 index, 3270 isSelected, 3271 isFocussed); 3272 } else { 3273 return null; 3274 } 3275 } 3276 3277 3278 // Accessible Methods 3279 /** 3280 * Get the AccessibleContext for this object. In the 3281 * implementation of the Java Accessibility API for this class, 3282 * returns this object, which is its own AccessibleContext. 3283 * 3284 * @return this object 3285 */ 3286 public AccessibleContext getAccessibleContext() { 3287 return this; 3288 } 3289 3290 3291 // AccessibleContext methods 3292 3293 public String getAccessibleName() { 3294 AccessibleContext ac = getCurrentAccessibleContext(); 3295 if (ac != null) { 3296 return ac.getAccessibleName(); 3297 } else { 3298 return null; 3299 } 3300 } 3301 3302 public void setAccessibleName(String s) { 3303 AccessibleContext ac = getCurrentAccessibleContext(); 3304 if (ac != null) { 3305 ac.setAccessibleName(s); 3306 } 3307 } 3308 3309 public String getAccessibleDescription() { 3310 AccessibleContext ac = getCurrentAccessibleContext(); 3311 if (ac != null) { 3312 return ac.getAccessibleDescription(); 3313 } else { 3314 return null; 3315 } 3316 } 3317 3318 public void setAccessibleDescription(String s) { 3319 AccessibleContext ac = getCurrentAccessibleContext(); 3320 if (ac != null) { 3321 ac.setAccessibleDescription(s); 3322 } 3323 } 3324 3325 public AccessibleRole getAccessibleRole() { 3326 AccessibleContext ac = getCurrentAccessibleContext(); 3327 if (ac != null) { 3328 return ac.getAccessibleRole(); 3329 } else { 3330 return null; 3331 } 3332 } 3333 3334 public AccessibleStateSet getAccessibleStateSet() { 3335 AccessibleContext ac = getCurrentAccessibleContext(); 3336 AccessibleStateSet s; 3337 if (ac != null) { 3338 s = ac.getAccessibleStateSet(); 3339 } else { 3340 s = new AccessibleStateSet(); 3341 } 3342 3343 s.add(AccessibleState.SELECTABLE); 3344 if (parent.isFocusOwner() 3345 && (indexInParent == parent.getLeadSelectionIndex())) { 3346 s.add(AccessibleState.ACTIVE); 3347 } 3348 if (parent.isSelectedIndex(indexInParent)) { 3349 s.add(AccessibleState.SELECTED); 3350 } 3351 if (this.isShowing()) { 3352 s.add(AccessibleState.SHOWING); 3353 } else if (s.contains(AccessibleState.SHOWING)) { 3354 s.remove(AccessibleState.SHOWING); 3355 } 3356 if (this.isVisible()) { 3357 s.add(AccessibleState.VISIBLE); 3358 } else if (s.contains(AccessibleState.VISIBLE)) { 3359 s.remove(AccessibleState.VISIBLE); 3360 } 3361 s.add(AccessibleState.TRANSIENT); // cell-rendered 3362 return s; 3363 } 3364 3365 public int getAccessibleIndexInParent() { 3366 return indexInParent; 3367 } 3368 3369 public int getAccessibleChildrenCount() { 3370 AccessibleContext ac = getCurrentAccessibleContext(); 3371 if (ac != null) { 3372 return ac.getAccessibleChildrenCount(); 3373 } else { 3374 return 0; 3375 } 3376 } 3377 3378 public Accessible getAccessibleChild(int i) { 3379 AccessibleContext ac = getCurrentAccessibleContext(); 3380 if (ac != null) { 3381 Accessible accessibleChild = ac.getAccessibleChild(i); 3382 ac.setAccessibleParent(this); 3383 return accessibleChild; 3384 } else { 3385 return null; 3386 } 3387 } 3388 3389 public Locale getLocale() { 3390 AccessibleContext ac = getCurrentAccessibleContext(); 3391 if (ac != null) { 3392 return ac.getLocale(); 3393 } else { 3394 return null; 3395 } 3396 } 3397 3398 public void addPropertyChangeListener(PropertyChangeListener l) { 3399 AccessibleContext ac = getCurrentAccessibleContext(); 3400 if (ac != null) { 3401 ac.addPropertyChangeListener(l); 3402 } 3403 } 3404 3405 public void removePropertyChangeListener(PropertyChangeListener l) { 3406 AccessibleContext ac = getCurrentAccessibleContext(); 3407 if (ac != null) { 3408 ac.removePropertyChangeListener(l); 3409 } 3410 } 3411 3412 /** 3413 * Get the AccessibleComponent associated with this object. In the 3414 * implementation of the Java Accessibility API for this class, 3415 * return this object, which is responsible for implementing the 3416 * AccessibleComponent interface on behalf of itself. 3417 * 3418 * @return this object 3419 */ 3420 public AccessibleComponent getAccessibleComponent() { 3421 return this; // to override getBounds() 3422 } 3423 3424 public AccessibleSelection getAccessibleSelection() { 3425 AccessibleContext ac = getCurrentAccessibleContext(); 3426 return ac != null ? ac.getAccessibleSelection() : null; 3427 } 3428 3429 public AccessibleText getAccessibleText() { 3430 AccessibleContext ac = getCurrentAccessibleContext(); 3431 return ac != null ? ac.getAccessibleText() : null; 3432 } 3433 3434 public AccessibleValue getAccessibleValue() { 3435 AccessibleContext ac = getCurrentAccessibleContext(); 3436 return ac != null ? ac.getAccessibleValue() : null; 3437 } 3438 3439 3440 // AccessibleComponent methods 3441 3442 public Color getBackground() { 3443 AccessibleContext ac = getCurrentAccessibleContext(); 3444 if (ac instanceof AccessibleComponent) { 3445 return ((AccessibleComponent) ac).getBackground(); 3446 } else { 3447 Component c = getCurrentComponent(); 3448 if (c != null) { 3449 return c.getBackground(); 3450 } else { 3451 return null; 3452 } 3453 } 3454 } 3455 3456 public void setBackground(Color c) { 3457 AccessibleContext ac = getCurrentAccessibleContext(); 3458 if (ac instanceof AccessibleComponent) { 3459 ((AccessibleComponent) ac).setBackground(c); 3460 } else { 3461 Component cp = getCurrentComponent(); 3462 if (cp != null) { 3463 cp.setBackground(c); 3464 } 3465 } 3466 } 3467 3468 public Color getForeground() { 3469 AccessibleContext ac = getCurrentAccessibleContext(); 3470 if (ac instanceof AccessibleComponent) { 3471 return ((AccessibleComponent) ac).getForeground(); 3472 } else { 3473 Component c = getCurrentComponent(); 3474 if (c != null) { 3475 return c.getForeground(); 3476 } else { 3477 return null; 3478 } 3479 } 3480 } 3481 3482 public void setForeground(Color c) { 3483 AccessibleContext ac = getCurrentAccessibleContext(); 3484 if (ac instanceof AccessibleComponent) { 3485 ((AccessibleComponent) ac).setForeground(c); 3486 } else { 3487 Component cp = getCurrentComponent(); 3488 if (cp != null) { 3489 cp.setForeground(c); 3490 } 3491 } 3492 } 3493 3494 public Cursor getCursor() { 3495 AccessibleContext ac = getCurrentAccessibleContext(); 3496 if (ac instanceof AccessibleComponent) { 3497 return ((AccessibleComponent) ac).getCursor(); 3498 } else { 3499 Component c = getCurrentComponent(); 3500 if (c != null) { 3501 return c.getCursor(); 3502 } else { 3503 Accessible ap = getAccessibleParent(); 3504 if (ap instanceof AccessibleComponent) { 3505 return ((AccessibleComponent) ap).getCursor(); 3506 } else { 3507 return null; 3508 } 3509 } 3510 } 3511 } 3512 3513 public void setCursor(Cursor c) { 3514 AccessibleContext ac = getCurrentAccessibleContext(); 3515 if (ac instanceof AccessibleComponent) { 3516 ((AccessibleComponent) ac).setCursor(c); 3517 } else { 3518 Component cp = getCurrentComponent(); 3519 if (cp != null) { 3520 cp.setCursor(c); 3521 } 3522 } 3523 } 3524 3525 public Font getFont() { 3526 AccessibleContext ac = getCurrentAccessibleContext(); 3527 if (ac instanceof AccessibleComponent) { 3528 return ((AccessibleComponent) ac).getFont(); 3529 } else { 3530 Component c = getCurrentComponent(); 3531 if (c != null) { 3532 return c.getFont(); 3533 } else { 3534 return null; 3535 } 3536 } 3537 } 3538 3539 public void setFont(Font f) { 3540 AccessibleContext ac = getCurrentAccessibleContext(); 3541 if (ac instanceof AccessibleComponent) { 3542 ((AccessibleComponent) ac).setFont(f); 3543 } else { 3544 Component c = getCurrentComponent(); 3545 if (c != null) { 3546 c.setFont(f); 3547 } 3548 } 3549 } 3550 3551 public FontMetrics getFontMetrics(Font f) { 3552 AccessibleContext ac = getCurrentAccessibleContext(); 3553 if (ac instanceof AccessibleComponent) { 3554 return ((AccessibleComponent) ac).getFontMetrics(f); 3555 } else { 3556 Component c = getCurrentComponent(); 3557 if (c != null) { 3558 return c.getFontMetrics(f); 3559 } else { 3560 return null; 3561 } 3562 } 3563 } 3564 3565 public boolean isEnabled() { 3566 AccessibleContext ac = getCurrentAccessibleContext(); 3567 if (ac instanceof AccessibleComponent) { 3568 return ((AccessibleComponent) ac).isEnabled(); 3569 } else { 3570 Component c = getCurrentComponent(); 3571 if (c != null) { 3572 return c.isEnabled(); 3573 } else { 3574 return false; 3575 } 3576 } 3577 } 3578 3579 public void setEnabled(boolean b) { 3580 AccessibleContext ac = getCurrentAccessibleContext(); 3581 if (ac instanceof AccessibleComponent) { 3582 ((AccessibleComponent) ac).setEnabled(b); 3583 } else { 3584 Component c = getCurrentComponent(); 3585 if (c != null) { 3586 c.setEnabled(b); 3587 } 3588 } 3589 } 3590 3591 public boolean isVisible() { 3592 int fi = parent.getFirstVisibleIndex(); 3593 int li = parent.getLastVisibleIndex(); 3594 // The UI incorrectly returns a -1 for the last 3595 // visible index if the list is smaller than the 3596 // viewport size. 3597 if (li == -1) { 3598 li = parent.getModel().getSize() - 1; 3599 } 3600 return ((indexInParent >= fi) 3601 && (indexInParent <= li)); 3602 } 3603 3604 public void setVisible(boolean b) { 3605 } 3606 3607 public boolean isShowing() { 3608 return (parent.isShowing() && isVisible()); 3609 } 3610 3611 public boolean contains(Point p) { 3612 AccessibleContext ac = getCurrentAccessibleContext(); 3613 if (ac instanceof AccessibleComponent) { 3614 Rectangle r = ((AccessibleComponent) ac).getBounds(); 3615 return r.contains(p); 3616 } else { 3617 Component c = getCurrentComponent(); 3618 if (c != null) { 3619 Rectangle r = c.getBounds(); 3620 return r.contains(p); 3621 } else { 3622 return getBounds().contains(p); 3623 } 3624 } 3625 } 3626 3627 public Point getLocationOnScreen() { 3628 if (parent != null) { 3629 Point listLocation; 3630 try { 3631 listLocation = parent.getLocationOnScreen(); 3632 } catch (IllegalComponentStateException e) { 3633 // This can happen if the component isn't visisble 3634 return null; 3635 } 3636 Point componentLocation = parent.indexToLocation(indexInParent); 3637 if (componentLocation != null) { 3638 componentLocation.translate(listLocation.x, listLocation.y); 3639 return componentLocation; 3640 } else { 3641 return null; 3642 } 3643 } else { 3644 return null; 3645 } 3646 } 3647 3648 public Point getLocation() { 3649 if (parent != null) { 3650 return parent.indexToLocation(indexInParent); 3651 } else { 3652 return null; 3653 } 3654 } 3655 3656 public void setLocation(Point p) { 3657 if ((parent != null) && (parent.contains(p))) { 3658 ensureIndexIsVisible(indexInParent); 3659 } 3660 } 3661 3662 public Rectangle getBounds() { 3663 if (parent != null) { 3664 return parent.getCellBounds(indexInParent,indexInParent); 3665 } else { 3666 return null; 3667 } 3668 } 3669 3670 public void setBounds(Rectangle r) { 3671 AccessibleContext ac = getCurrentAccessibleContext(); 3672 if (ac instanceof AccessibleComponent) { 3673 ((AccessibleComponent) ac).setBounds(r); 3674 } 3675 } 3676 3677 public Dimension getSize() { 3678 Rectangle cellBounds = this.getBounds(); 3679 if (cellBounds != null) { 3680 return cellBounds.getSize(); 3681 } else { 3682 return null; 3683 } 3684 } 3685 3686 public void setSize (Dimension d) { 3687 AccessibleContext ac = getCurrentAccessibleContext(); 3688 if (ac instanceof AccessibleComponent) { 3689 ((AccessibleComponent) ac).setSize(d); 3690 } else { 3691 Component c = getCurrentComponent(); 3692 if (c != null) { 3693 c.setSize(d); 3694 } 3695 } 3696 } 3697 3698 public Accessible getAccessibleAt(Point p) { 3699 AccessibleContext ac = getCurrentAccessibleContext(); 3700 if (ac instanceof AccessibleComponent) { 3701 return ((AccessibleComponent) ac).getAccessibleAt(p); 3702 } else { 3703 return null; 3704 } 3705 } 3706 3707 @SuppressWarnings("deprecation") 3708 public boolean isFocusTraversable() { 3709 AccessibleContext ac = getCurrentAccessibleContext(); 3710 if (ac instanceof AccessibleComponent) { 3711 return ((AccessibleComponent) ac).isFocusTraversable(); 3712 } else { 3713 Component c = getCurrentComponent(); 3714 if (c != null) { 3715 return c.isFocusTraversable(); 3716 } else { 3717 return false; 3718 } 3719 } 3720 } 3721 3722 public void requestFocus() { 3723 AccessibleContext ac = getCurrentAccessibleContext(); 3724 if (ac instanceof AccessibleComponent) { 3725 ((AccessibleComponent) ac).requestFocus(); 3726 } else { 3727 Component c = getCurrentComponent(); 3728 if (c != null) { 3729 c.requestFocus(); 3730 } 3731 } 3732 } 3733 3734 public void addFocusListener(FocusListener l) { 3735 AccessibleContext ac = getCurrentAccessibleContext(); 3736 if (ac instanceof AccessibleComponent) { 3737 ((AccessibleComponent) ac).addFocusListener(l); 3738 } else { 3739 Component c = getCurrentComponent(); 3740 if (c != null) { 3741 c.addFocusListener(l); 3742 } 3743 } 3744 } 3745 3746 public void removeFocusListener(FocusListener l) { 3747 AccessibleContext ac = getCurrentAccessibleContext(); 3748 if (ac instanceof AccessibleComponent) { 3749 ((AccessibleComponent) ac).removeFocusListener(l); 3750 } else { 3751 Component c = getCurrentComponent(); 3752 if (c != null) { 3753 c.removeFocusListener(l); 3754 } 3755 } 3756 } 3757 3758 // TIGER - 4733624 3759 /** 3760 * Returns the icon for the element renderer, as the only item 3761 * of an array of <code>AccessibleIcon</code>s or a <code>null</code> array 3762 * if the renderer component contains no icons. 3763 * 3764 * @return an array containing the accessible icon 3765 * or a <code>null</code> array if none 3766 * @since 1.3 3767 */ 3768 public AccessibleIcon [] getAccessibleIcon() { 3769 AccessibleContext ac = getCurrentAccessibleContext(); 3770 if (ac != null) { 3771 return ac.getAccessibleIcon(); 3772 } else { 3773 return null; 3774 } 3775 } 3776 3777 /** 3778 * {@inheritDoc} 3779 * @implSpec Returns the AccessibleAction for this AccessibleJListChild 3780 * as follows: First getListCellRendererComponent of the ListCellRenderer 3781 * for the component at the "index in parent" of this child is called. 3782 * Then its AccessibleContext is fetched and that AccessibleContext's 3783 * AccessibleAction is returned. Note that if an AccessibleAction 3784 * is not found using this process then this object with its implementation 3785 * of the AccessibleAction interface is returned. 3786 * @since 9 3787 */ 3788 @Override 3789 public AccessibleAction getAccessibleAction() { 3790 AccessibleContext ac = getCurrentAccessibleContext(); 3791 if (ac == null) { 3792 return null; 3793 } else { 3794 AccessibleAction aa = ac.getAccessibleAction(); 3795 if (aa != null) { 3796 return aa; 3797 } else { 3798 return this; 3799 } 3800 } 3801 } 3802 3803 /** 3804 * {@inheritDoc} 3805 * @implSpec If i == 0 selects this AccessibleJListChild by calling 3806 * JList.this.setSelectedIndex(indexInParent) and then returns true; 3807 * otherwise returns false. 3808 * @since 9 3809 */ 3810 @Override 3811 public boolean doAccessibleAction(int i) { 3812 if (i == 0) { 3813 JList.this.setSelectedIndex(indexInParent); 3814 return true; 3815 } else { 3816 return false; 3817 } 3818 } 3819 3820 /** 3821 * {@inheritDoc} 3822 * @implSpec If i == 0 returns the action description fetched from 3823 * UIManager.getString("AbstractButton.clickText"); 3824 * otherwise returns null. 3825 * @since 9 3826 */ 3827 @Override 3828 public String getAccessibleActionDescription(int i) { 3829 if (i == 0) { 3830 return UIManager.getString("AbstractButton.clickText"); 3831 } else { 3832 return null; 3833 } 3834 } 3835 3836 /** 3837 * {@inheritDoc} 3838 * @implSpec Returns 1, i.e. there is only one action. 3839 * @since 9 3840 */ 3841 @Override 3842 public int getAccessibleActionCount() { 3843 return 1; 3844 } 3845 3846 } // inner class AccessibleJListChild 3847 3848 } // inner class AccessibleJList 3849 }