1 /*
   2  * Copyright (c) 1995, 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 
  26 package java.awt;
  27 
  28 import java.awt.datatransfer.Clipboard;
  29 import java.awt.dnd.DragGestureListener;
  30 import java.awt.dnd.DragGestureRecognizer;
  31 import java.awt.dnd.DragSource;
  32 import java.awt.event.AWTEventListener;
  33 import java.awt.event.AWTEventListenerProxy;
  34 import java.awt.event.ActionEvent;
  35 import java.awt.event.AdjustmentEvent;
  36 import java.awt.event.ComponentEvent;
  37 import java.awt.event.ContainerEvent;
  38 import java.awt.event.FocusEvent;
  39 import java.awt.event.HierarchyEvent;
  40 import java.awt.event.InputEvent;
  41 import java.awt.event.InputMethodEvent;
  42 import java.awt.event.InvocationEvent;
  43 import java.awt.event.ItemEvent;
  44 import java.awt.event.KeyEvent;
  45 import java.awt.event.MouseEvent;
  46 import java.awt.event.PaintEvent;
  47 import java.awt.event.TextEvent;
  48 import java.awt.event.WindowEvent;
  49 import java.awt.im.InputMethodHighlight;
  50 import java.awt.image.ColorModel;
  51 import java.awt.image.ImageObserver;
  52 import java.awt.image.ImageProducer;
  53 import java.beans.PropertyChangeEvent;
  54 import java.beans.PropertyChangeListener;
  55 import java.beans.PropertyChangeSupport;
  56 import java.io.File;
  57 import java.io.FileInputStream;
  58 import java.net.URL;
  59 import java.security.AccessController;
  60 import java.security.PrivilegedAction;
  61 import java.util.ArrayList;
  62 import java.util.Arrays;
  63 import java.util.EventListener;
  64 import java.util.HashMap;
  65 import java.util.Map;
  66 import java.util.MissingResourceException;
  67 import java.util.Properties;
  68 import java.util.ResourceBundle;
  69 import java.util.ServiceLoader;
  70 import java.util.Set;
  71 import java.util.WeakHashMap;
  72 import java.util.stream.Collectors;
  73 
  74 import javax.accessibility.AccessibilityProvider;
  75 
  76 import sun.awt.AWTAccessor;
  77 import sun.awt.AWTPermissions;
  78 import sun.awt.AppContext;
  79 import sun.awt.HeadlessToolkit;
  80 import sun.awt.PeerEvent;
  81 import sun.awt.SunToolkit;
  82 
  83 /**
  84  * This class is the abstract superclass of all actual
  85  * implementations of the Abstract Window Toolkit. Subclasses of
  86  * the {@code Toolkit} class are used to bind the various components
  87  * to particular native toolkit implementations.
  88  * <p>
  89  * Many GUI events may be delivered to user
  90  * asynchronously, if the opposite is not specified explicitly.
  91  * As well as
  92  * many GUI operations may be performed asynchronously.
  93  * This fact means that if the state of a component is set, and then
  94  * the state immediately queried, the returned value may not yet
  95  * reflect the requested change.  This behavior includes, but is not
  96  * limited to:
  97  * <ul>
  98  * <li>Scrolling to a specified position.
  99  * <br>For example, calling {@code ScrollPane.setScrollPosition}
 100  *     and then {@code getScrollPosition} may return an incorrect
 101  *     value if the original request has not yet been processed.
 102  *
 103  * <li>Moving the focus from one component to another.
 104  * <br>For more information, see
 105  * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#transferTiming">Timing
 106  * Focus Transfers</a>, a section in
 107  * <a href="https://docs.oracle.com/javase/tutorial/uiswing/">The Swing
 108  * Tutorial</a>.
 109  *
 110  * <li>Making a top-level container visible.
 111  * <br>Calling {@code setVisible(true)} on a {@code Window},
 112  *     {@code Frame} or {@code Dialog} may occur
 113  *     asynchronously.
 114  *
 115  * <li>Setting the size or location of a top-level container.
 116  * <br>Calls to {@code setSize}, {@code setBounds} or
 117  *     {@code setLocation} on a {@code Window},
 118  *     {@code Frame} or {@code Dialog} are forwarded
 119  *     to the underlying window management system and may be
 120  *     ignored or modified.  See {@link java.awt.Window} for
 121  *     more information.
 122  * </ul>
 123  * <p>
 124  * Most applications should not call any of the methods in this
 125  * class directly. The methods defined by {@code Toolkit} are
 126  * the "glue" that joins the platform-independent classes in the
 127  * {@code java.awt} package with their counterparts in
 128  * {@code java.awt.peer}. Some methods defined by
 129  * {@code Toolkit} query the native operating system directly.
 130  *
 131  * @author      Sami Shaio
 132  * @author      Arthur van Hoff
 133  * @author      Fred Ecks
 134  * @since       1.0
 135  */
 136 public abstract class Toolkit {
 137 
 138     // The following method is called by the private method
 139     // <code>updateSystemColors</code> in <code>SystemColor</code>.
 140 
 141     /**
 142      * Fills in the integer array that is supplied as an argument
 143      * with the current system color values.
 144      *
 145      * @param     systemColors an integer array.
 146      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 147      * returns true
 148      * @see       java.awt.GraphicsEnvironment#isHeadless
 149      * @since     1.1
 150      */
 151     protected void loadSystemColors(int[] systemColors)
 152         throws HeadlessException {
 153         GraphicsEnvironment.checkHeadless();
 154     }
 155 
 156     /**
 157      * Controls whether the layout of Containers is validated dynamically
 158      * during resizing, or statically, after resizing is complete.
 159      * Use {@code isDynamicLayoutActive()} to detect if this feature enabled
 160      * in this program and is supported by this operating system
 161      * and/or window manager.
 162      * Note that this feature is supported not on all platforms, and
 163      * conversely, that this feature cannot be turned off on some platforms.
 164      * On these platforms where dynamic layout during resizing is not supported
 165      * (or is always supported), setting this property has no effect.
 166      * Note that this feature can be set or unset as a property of the
 167      * operating system or window manager on some platforms.  On such
 168      * platforms, the dynamic resize property must be set at the operating
 169      * system or window manager level before this method can take effect.
 170      * This method does not change support or settings of the underlying
 171      * operating system or
 172      * window manager.  The OS/WM support can be
 173      * queried using getDesktopProperty("awt.dynamicLayoutSupported") method.
 174      *
 175      * @param     dynamic  If true, Containers should re-layout their
 176      *            components as the Container is being resized.  If false,
 177      *            the layout will be validated after resizing is completed.
 178      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 179      *            returns true
 180      * @see       #isDynamicLayoutSet()
 181      * @see       #isDynamicLayoutActive()
 182      * @see       #getDesktopProperty(String propertyName)
 183      * @see       java.awt.GraphicsEnvironment#isHeadless
 184      * @since     1.4
 185      */
 186     public void setDynamicLayout(final boolean dynamic)
 187         throws HeadlessException {
 188         GraphicsEnvironment.checkHeadless();
 189         if (this != getDefaultToolkit()) {
 190             getDefaultToolkit().setDynamicLayout(dynamic);
 191         }
 192     }
 193 
 194     /**
 195      * Returns whether the layout of Containers is validated dynamically
 196      * during resizing, or statically, after resizing is complete.
 197      * Note: this method returns the value that was set programmatically;
 198      * it does not reflect support at the level of the operating system
 199      * or window manager for dynamic layout on resizing, or the current
 200      * operating system or window manager settings.  The OS/WM support can
 201      * be queried using getDesktopProperty("awt.dynamicLayoutSupported").
 202      *
 203      * @return    true if validation of Containers is done dynamically,
 204      *            false if validation is done after resizing is finished.
 205      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 206      *            returns true
 207      * @see       #setDynamicLayout(boolean dynamic)
 208      * @see       #isDynamicLayoutActive()
 209      * @see       #getDesktopProperty(String propertyName)
 210      * @see       java.awt.GraphicsEnvironment#isHeadless
 211      * @since     1.4
 212      */
 213     protected boolean isDynamicLayoutSet()
 214         throws HeadlessException {
 215         GraphicsEnvironment.checkHeadless();
 216 
 217         if (this != Toolkit.getDefaultToolkit()) {
 218             return Toolkit.getDefaultToolkit().isDynamicLayoutSet();
 219         } else {
 220             return false;
 221         }
 222     }
 223 
 224     /**
 225      * Returns whether dynamic layout of Containers on resize is currently
 226      * enabled on the underlying operating system and/or window manager. If the
 227      * platform supports it, {@code setDynamicLayout(boolean)} may be used to
 228      * programmatically enable or disable platform dynamic layout. Regardless of
 229      * whether that toggling is supported, or whether {@code true} or {@code
 230      * false} is specified as an argument, or has never been called at all, this
 231      * method will return the active current platform behavior and which will be
 232      * followed by the JDK in determining layout policy during resizing.
 233      * <p>
 234      * If dynamic layout is currently inactive then Containers re-layout their
 235      * components when resizing is completed. As a result the
 236      * {@code Component.validate()} method will be invoked only once per resize.
 237      * If dynamic layout is currently active then Containers re-layout their
 238      * components on every native resize event and the {@code validate()} method
 239      * will be invoked each time. The OS/WM support can be queried using the
 240      * getDesktopProperty("awt.dynamicLayoutSupported") method. This property
 241      * will reflect the platform capability but is not sufficient to tell if it
 242      * is presently enabled.
 243      *
 244      * @return true if dynamic layout of Containers on resize is currently
 245      *         active, false otherwise.
 246      * @throws HeadlessException if the GraphicsEnvironment.isHeadless() method
 247      *         returns true
 248      * @see #setDynamicLayout(boolean dynamic)
 249      * @see #isDynamicLayoutSet()
 250      * @see #getDesktopProperty(String propertyName)
 251      * @see java.awt.GraphicsEnvironment#isHeadless
 252      * @since 1.4
 253      */
 254     public boolean isDynamicLayoutActive()
 255         throws HeadlessException {
 256         GraphicsEnvironment.checkHeadless();
 257 
 258         if (this != Toolkit.getDefaultToolkit()) {
 259             return Toolkit.getDefaultToolkit().isDynamicLayoutActive();
 260         } else {
 261             return false;
 262         }
 263     }
 264 
 265     /**
 266      * Gets the size of the screen.  On systems with multiple displays, the
 267      * primary display is used.  Multi-screen aware display dimensions are
 268      * available from {@code GraphicsConfiguration} and
 269      * {@code GraphicsDevice}.
 270      * @return    the size of this toolkit's screen, in pixels.
 271      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 272      * returns true
 273      * @see       java.awt.GraphicsConfiguration#getBounds
 274      * @see       java.awt.GraphicsDevice#getDisplayMode
 275      * @see       java.awt.GraphicsEnvironment#isHeadless
 276      */
 277     public abstract Dimension getScreenSize()
 278         throws HeadlessException;
 279 
 280     /**
 281      * Returns the screen resolution in dots-per-inch.
 282      * @return    this toolkit's screen resolution, in dots-per-inch.
 283      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 284      * returns true
 285      * @see       java.awt.GraphicsEnvironment#isHeadless
 286      */
 287     public abstract int getScreenResolution()
 288         throws HeadlessException;
 289 
 290     /**
 291      * Gets the insets of the screen.
 292      * @param     gc a {@code GraphicsConfiguration}
 293      * @return    the insets of this toolkit's screen, in pixels.
 294      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 295      * returns true
 296      * @see       java.awt.GraphicsEnvironment#isHeadless
 297      * @since     1.4
 298      */
 299     public Insets getScreenInsets(GraphicsConfiguration gc)
 300         throws HeadlessException {
 301         GraphicsEnvironment.checkHeadless();
 302         if (this != Toolkit.getDefaultToolkit()) {
 303             return Toolkit.getDefaultToolkit().getScreenInsets(gc);
 304         } else {
 305             return new Insets(0, 0, 0, 0);
 306         }
 307     }
 308 
 309     /**
 310      * Determines the color model of this toolkit's screen.
 311      * <p>
 312      * {@code ColorModel} is an abstract class that
 313      * encapsulates the ability to translate between the
 314      * pixel values of an image and its red, green, blue,
 315      * and alpha components.
 316      * <p>
 317      * This toolkit method is called by the
 318      * {@code getColorModel} method
 319      * of the {@code Component} class.
 320      * @return    the color model of this toolkit's screen.
 321      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 322      * returns true
 323      * @see       java.awt.GraphicsEnvironment#isHeadless
 324      * @see       java.awt.image.ColorModel
 325      * @see       java.awt.Component#getColorModel
 326      */
 327     public abstract ColorModel getColorModel()
 328         throws HeadlessException;
 329 
 330     /**
 331      * Returns the names of the available fonts in this toolkit.<p>
 332      * For 1.1, the following font names are deprecated (the replacement
 333      * name follows):
 334      * <ul>
 335      * <li>TimesRoman (use Serif)
 336      * <li>Helvetica (use SansSerif)
 337      * <li>Courier (use Monospaced)
 338      * </ul><p>
 339      * The ZapfDingbats fontname is also deprecated in 1.1 but the characters
 340      * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports
 341      * those characters.
 342      * @return    the names of the available fonts in this toolkit.
 343      * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()}
 344      * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()
 345      */
 346     @Deprecated
 347     public abstract String[] getFontList();
 348 
 349     /**
 350      * Gets the screen device metrics for rendering of the font.
 351      * @param     font   a font
 352      * @return    the screen metrics of the specified font in this toolkit
 353      * @deprecated  As of JDK version 1.2, replaced by the {@code Font}
 354      *          method {@code getLineMetrics}.
 355      * @see java.awt.font.LineMetrics
 356      * @see java.awt.Font#getLineMetrics
 357      * @see java.awt.GraphicsEnvironment#getScreenDevices
 358      */
 359     @Deprecated
 360     public abstract FontMetrics getFontMetrics(Font font);
 361 
 362     /**
 363      * Synchronizes this toolkit's graphics state. Some window systems
 364      * may do buffering of graphics events.
 365      * <p>
 366      * This method ensures that the display is up-to-date. It is useful
 367      * for animation.
 368      */
 369     public abstract void sync();
 370 
 371     /**
 372      * The default toolkit.
 373      */
 374     private static Toolkit toolkit;
 375 
 376     /**
 377      * Used internally by the assistive technologies functions; set at
 378      * init time and used at load time
 379      */
 380     private static String atNames;
 381 
 382     /**
 383      * Initializes properties related to assistive technologies.
 384      * These properties are used both in the loadAssistiveProperties()
 385      * function below, as well as other classes in the jdk that depend
 386      * on the properties (such as the use of the screen_magnifier_present
 387      * property in Java2D hardware acceleration initialization).  The
 388      * initialization of the properties must be done before the platform-
 389      * specific Toolkit class is instantiated so that all necessary
 390      * properties are set up properly before any classes dependent upon them
 391      * are initialized.
 392      */
 393     private static void initAssistiveTechnologies() {
 394 
 395         // Get accessibility properties
 396         final String sep = File.separator;
 397         final Properties properties = new Properties();
 398 
 399 
 400         atNames = java.security.AccessController.doPrivileged(
 401             new java.security.PrivilegedAction<String>() {
 402             public String run() {
 403 
 404                 // Try loading the per-user accessibility properties file.
 405                 try {
 406                     File propsFile = new File(
 407                       System.getProperty("user.home") +
 408                       sep + ".accessibility.properties");
 409                     FileInputStream in =
 410                         new FileInputStream(propsFile);
 411 
 412                     // Inputstream has been buffered in Properties class
 413                     properties.load(in);
 414                     in.close();
 415                 } catch (Exception e) {
 416                     // Per-user accessibility properties file does not exist
 417                 }
 418 
 419                 // Try loading the system-wide accessibility properties
 420                 // file only if a per-user accessibility properties
 421                 // file does not exist or is empty.
 422                 if (properties.size() == 0) {
 423                     try {
 424                         File propsFile = new File(
 425                             System.getProperty("java.home") + sep + "conf" +
 426                             sep + "accessibility.properties");
 427                         FileInputStream in =
 428                             new FileInputStream(propsFile);
 429 
 430                         // Inputstream has been buffered in Properties class
 431                         properties.load(in);
 432                         in.close();
 433                     } catch (Exception e) {
 434                         // System-wide accessibility properties file does
 435                         // not exist;
 436                     }
 437                 }
 438 
 439                 // Get whether a screen magnifier is present.  First check
 440                 // the system property and then check the properties file.
 441                 String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present");
 442                 if (magPresent == null) {
 443                     magPresent = properties.getProperty("screen_magnifier_present", null);
 444                     if (magPresent != null) {
 445                         System.setProperty("javax.accessibility.screen_magnifier_present", magPresent);
 446                     }
 447                 }
 448 
 449                 // Get the names of any assistive technologies to load.  First
 450                 // check the system property and then check the properties
 451                 // file.
 452                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 453                 if (classNames == null) {
 454                     classNames = properties.getProperty("assistive_technologies", null);
 455                     if (classNames != null) {
 456                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 457                     }
 458                 }
 459                 return classNames;
 460             }
 461         });
 462     }
 463 
 464     /**
 465      * Rethrow the AWTError but include the cause.
 466      *
 467      * @param s the error message
 468      * @param e the original exception
 469      * @throws AWTError the new AWTError including the cause (the original exception)
 470      */
 471     private static void newAWTError(Throwable e, String s) {
 472         AWTError newAWTError = new AWTError(s);
 473         newAWTError.initCause(e);
 474         throw newAWTError;
 475     }
 476 
 477     /**
 478      * When a service provider for Assistive Technology is not found look for a
 479      * supporting class on the class path and instantiate it.
 480      *
 481      * @param atName the name of the class to be loaded
 482      */
 483     private static void fallbackToLoadClassForAT(String atName) {
 484         try {
 485             Class<?> c = Class.forName(atName, false, ClassLoader.getSystemClassLoader());
 486             c.getConstructor().newInstance();
 487         } catch (ClassNotFoundException e) {
 488             newAWTError(e, "Assistive Technology not found: " + atName);
 489         } catch (InstantiationException e) {
 490             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);
 491         } catch (IllegalAccessException e) {
 492             newAWTError(e, "Could not access Assistive Technology: " + atName);
 493         } catch (Exception e) {
 494             newAWTError(e, "Error trying to install Assistive Technology: " + atName);
 495         }
 496     }
 497 
 498     /**
 499      * Loads accessibility support using the property assistive_technologies.
 500      * The form is assistive_technologies= followed by a comma-separated list of
 501      * assistive technology providers to load.  The order in which providers are
 502      * loaded is determined by the order in which the ServiceLoader discovers
 503      * implementations of the AccessibilityProvider interface, not by the order
 504      * of provider names in the property list.  When a provider is found its
 505      * accessibility implementation will be started by calling the provider's
 506      * activate method.  All errors are handled via an AWTError exception.




 507      */
 508     private static void loadAssistiveTechnologies() {
 509         // Load any assistive technologies
 510         if (atNames != null) {
 511             ClassLoader cl = ClassLoader.getSystemClassLoader();
 512             Set<String> names = Arrays.stream(atNames.split(","))
 513                                       .map(String::trim)
 514                                       .collect(Collectors.toSet());
 515             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 516             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 517                 try {
 518                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 519                         String name = p.getName();
 520                         if (names.contains(name) && !providers.containsKey(name)) {
 521                             p.activate();
 522                             providers.put(name, p);
 523                         }
 524                     }
 525                 } catch (java.util.ServiceConfigurationError | Exception e) {
 526                     newAWTError(e, "Could not load or activate service provider");
 527                 }
 528                 return null;
 529             });
 530             names.stream()
 531                  .filter(n -> !providers.containsKey(n))
 532                  .forEach(Toolkit::fallbackToLoadClassForAT);
 533         }
 534     }
 535 
 536     /**
 537      * Gets the default toolkit.
 538      * <p>
 539      * If a system property named {@code "java.awt.headless"} is set
 540      * to {@code true} then the headless implementation
 541      * of {@code Toolkit} is used,
 542      * otherwise the default platform-specific implementation of
 543      * {@code Toolkit} is used.
 544      * <p>
 545      * If this Toolkit is not a headless implementation and if they exist, service
 546      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 547      * if specified by the system property
 548      * {@code javax.accessibility.assistive_technologies}.
 549      * <p>
 550      * An example of setting this property is to invoke Java with
 551      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 552      * In addition to MyServiceProvider other service providers can be specified
 553      * using a comma separated list.  Service providers are loaded after the AWT
 554      * toolkit is created. All errors are handled via an AWTError exception.







 555      * <p>
 556      * The names specified in the assistive_technologies property are used to query
 557      * each service provider implementation.  If the requested name matches the
 558      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 559      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 560      * matching service provider.
 561      *
 562      * @implSpec
 563      * If assistive technology service providers are not specified with a system
 564      * property this implementation will look in a properties file located as follows:
 565      * <ul>
 566      * <li> {@code ${user.home}/.accessibility.properties}
 567      * <li> {@code ${java.home}/conf/accessibility.properties}
 568      * </ul>
 569      * Only the first of these files to be located will be consulted.  The requested
 570      * service providers are specified by setting the {@code assistive_technologies=}
 571      * property.  A single provider or a comma separated list of providers can be
 572      * specified.
 573      *
 574      * @return     the default toolkit.
 575      * @exception  AWTError  if a toolkit could not be found, or
 576      *                 if one could not be accessed or instantiated.
 577      * @see java.util.ServiceLoader
 578      * @see javax.accessibility.AccessibilityProvider
 579      */
 580     public static synchronized Toolkit getDefaultToolkit() {
 581         if (toolkit == null) {
 582             java.security.AccessController.doPrivileged(
 583                     new java.security.PrivilegedAction<Void>() {
 584                 public Void run() {
 585                     Class<?> cls = null;
 586                     String nm = System.getProperty("awt.toolkit");
 587                     try {
 588                         cls = Class.forName(nm);
 589                     } catch (ClassNotFoundException e) {
 590                         ClassLoader cl = ClassLoader.getSystemClassLoader();
 591                         if (cl != null) {
 592                             try {
 593                                 cls = cl.loadClass(nm);
 594                             } catch (final ClassNotFoundException ignored) {
 595                                 throw new AWTError("Toolkit not found: " + nm);
 596                             }
 597                         }
 598                     }
 599                     try {
 600                         if (cls != null) {
 601                             toolkit = (Toolkit)cls.getConstructor().newInstance();
 602                             if (GraphicsEnvironment.isHeadless()) {
 603                                 toolkit = new HeadlessToolkit(toolkit);
 604                             }
 605                         }
 606                     } catch (final ReflectiveOperationException ignored) {
 607                         throw new AWTError("Could not create Toolkit: " + nm);
 608                     }
 609                     return null;
 610                 }
 611             });
 612             if (!GraphicsEnvironment.isHeadless()) {
 613                 loadAssistiveTechnologies();
 614             }
 615         }
 616         return toolkit;
 617     }
 618 
 619     /**
 620      * Returns an image which gets pixel data from the specified file,
 621      * whose format can be either GIF, JPEG or PNG.
 622      * The underlying toolkit attempts to resolve multiple requests
 623      * with the same filename to the same returned Image.
 624      * <p>
 625      * Since the mechanism required to facilitate this sharing of
 626      * {@code Image} objects may continue to hold onto images
 627      * that are no longer in use for an indefinite period of time,
 628      * developers are encouraged to implement their own caching of
 629      * images by using the {@link #createImage(java.lang.String) createImage}
 630      * variant wherever available.
 631      * If the image data contained in the specified file changes,
 632      * the {@code Image} object returned from this method may
 633      * still contain stale information which was loaded from the
 634      * file after a prior call.
 635      * Previously loaded image data can be manually discarded by
 636      * calling the {@link Image#flush flush} method on the
 637      * returned {@code Image}.
 638      * <p>
 639      * This method first checks if there is a security manager installed.
 640      * If so, the method calls the security manager's
 641      * {@code checkRead} method with the file specified to ensure
 642      * that the access to the image is allowed.
 643      * @param     filename   the name of a file containing pixel data
 644      *                         in a recognized file format.
 645      * @return    an image which gets its pixel data from
 646      *                         the specified file.
 647      * @throws SecurityException  if a security manager exists and its
 648      *                            checkRead method doesn't allow the operation.
 649      * @see #createImage(java.lang.String)
 650      */
 651     public abstract Image getImage(String filename);
 652 
 653     /**
 654      * Returns an image which gets pixel data from the specified URL.
 655      * The pixel data referenced by the specified URL must be in one
 656      * of the following formats: GIF, JPEG or PNG.
 657      * The underlying toolkit attempts to resolve multiple requests
 658      * with the same URL to the same returned Image.
 659      * <p>
 660      * Since the mechanism required to facilitate this sharing of
 661      * {@code Image} objects may continue to hold onto images
 662      * that are no longer in use for an indefinite period of time,
 663      * developers are encouraged to implement their own caching of
 664      * images by using the {@link #createImage(java.net.URL) createImage}
 665      * variant wherever available.
 666      * If the image data stored at the specified URL changes,
 667      * the {@code Image} object returned from this method may
 668      * still contain stale information which was fetched from the
 669      * URL after a prior call.
 670      * Previously loaded image data can be manually discarded by
 671      * calling the {@link Image#flush flush} method on the
 672      * returned {@code Image}.
 673      * <p>
 674      * This method first checks if there is a security manager installed.
 675      * If so, the method calls the security manager's
 676      * {@code checkPermission} method with the corresponding
 677      * permission to ensure that the access to the image is allowed.
 678      * If the connection to the specified URL requires
 679      * either {@code URLPermission} or {@code SocketPermission},
 680      * then {@code URLPermission} is used for security checks.
 681      * @param     url   the URL to use in fetching the pixel data.
 682      * @return    an image which gets its pixel data from
 683      *                         the specified URL.
 684      * @throws SecurityException  if a security manager exists and its
 685      *                            checkPermission method doesn't allow
 686      *                            the operation.
 687      * @see #createImage(java.net.URL)
 688      */
 689     public abstract Image getImage(URL url);
 690 
 691     /**
 692      * Returns an image which gets pixel data from the specified file.
 693      * The returned Image is a new object which will not be shared
 694      * with any other caller of this method or its getImage variant.
 695      * <p>
 696      * This method first checks if there is a security manager installed.
 697      * If so, the method calls the security manager's
 698      * {@code checkRead} method with the specified file to ensure
 699      * that the image creation is allowed.
 700      * @param     filename   the name of a file containing pixel data
 701      *                         in a recognized file format.
 702      * @return    an image which gets its pixel data from
 703      *                         the specified file.
 704      * @throws SecurityException  if a security manager exists and its
 705      *                            checkRead method doesn't allow the operation.
 706      * @see #getImage(java.lang.String)
 707      */
 708     public abstract Image createImage(String filename);
 709 
 710     /**
 711      * Returns an image which gets pixel data from the specified URL.
 712      * The returned Image is a new object which will not be shared
 713      * with any other caller of this method or its getImage variant.
 714      * <p>
 715      * This method first checks if there is a security manager installed.
 716      * If so, the method calls the security manager's
 717      * {@code checkPermission} method with the corresponding
 718      * permission to ensure that the image creation is allowed.
 719      * If the connection to the specified URL requires
 720      * either {@code URLPermission} or {@code SocketPermission},
 721      * then {@code URLPermission} is used for security checks.
 722      * @param     url   the URL to use in fetching the pixel data.
 723      * @return    an image which gets its pixel data from
 724      *                         the specified URL.
 725      * @throws SecurityException  if a security manager exists and its
 726      *                            checkPermission method doesn't allow
 727      *                            the operation.
 728      * @see #getImage(java.net.URL)
 729      */
 730     public abstract Image createImage(URL url);
 731 
 732     /**
 733      * Prepares an image for rendering.
 734      * <p>
 735      * If the values of the width and height arguments are both
 736      * {@code -1}, this method prepares the image for rendering
 737      * on the default screen; otherwise, this method prepares an image
 738      * for rendering on the default screen at the specified width and height.
 739      * <p>
 740      * The image data is downloaded asynchronously in another thread,
 741      * and an appropriately scaled screen representation of the image is
 742      * generated.
 743      * <p>
 744      * This method is called by components {@code prepareImage}
 745      * methods.
 746      * <p>
 747      * Information on the flags returned by this method can be found
 748      * with the definition of the {@code ImageObserver} interface.
 749 
 750      * @param     image      the image for which to prepare a
 751      *                           screen representation.
 752      * @param     width      the width of the desired screen
 753      *                           representation, or {@code -1}.
 754      * @param     height     the height of the desired screen
 755      *                           representation, or {@code -1}.
 756      * @param     observer   the {@code ImageObserver}
 757      *                           object to be notified as the
 758      *                           image is being prepared.
 759      * @return    {@code true} if the image has already been
 760      *                 fully prepared; {@code false} otherwise.
 761      * @see       java.awt.Component#prepareImage(java.awt.Image,
 762      *                 java.awt.image.ImageObserver)
 763      * @see       java.awt.Component#prepareImage(java.awt.Image,
 764      *                 int, int, java.awt.image.ImageObserver)
 765      * @see       java.awt.image.ImageObserver
 766      */
 767     public abstract boolean prepareImage(Image image, int width, int height,
 768                                          ImageObserver observer);
 769 
 770     /**
 771      * Indicates the construction status of a specified image that is
 772      * being prepared for display.
 773      * <p>
 774      * If the values of the width and height arguments are both
 775      * {@code -1}, this method returns the construction status of
 776      * a screen representation of the specified image in this toolkit.
 777      * Otherwise, this method returns the construction status of a
 778      * scaled representation of the image at the specified width
 779      * and height.
 780      * <p>
 781      * This method does not cause the image to begin loading.
 782      * An application must call {@code prepareImage} to force
 783      * the loading of an image.
 784      * <p>
 785      * This method is called by the component's {@code checkImage}
 786      * methods.
 787      * <p>
 788      * Information on the flags returned by this method can be found
 789      * with the definition of the {@code ImageObserver} interface.
 790      * @param     image   the image whose status is being checked.
 791      * @param     width   the width of the scaled version whose status is
 792      *                 being checked, or {@code -1}.
 793      * @param     height  the height of the scaled version whose status
 794      *                 is being checked, or {@code -1}.
 795      * @param     observer   the {@code ImageObserver} object to be
 796      *                 notified as the image is being prepared.
 797      * @return    the bitwise inclusive <strong>OR</strong> of the
 798      *                 {@code ImageObserver} flags for the
 799      *                 image data that is currently available.
 800      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 801      *                 int, int, java.awt.image.ImageObserver)
 802      * @see       java.awt.Component#checkImage(java.awt.Image,
 803      *                 java.awt.image.ImageObserver)
 804      * @see       java.awt.Component#checkImage(java.awt.Image,
 805      *                 int, int, java.awt.image.ImageObserver)
 806      * @see       java.awt.image.ImageObserver
 807      */
 808     public abstract int checkImage(Image image, int width, int height,
 809                                    ImageObserver observer);
 810 
 811     /**
 812      * Creates an image with the specified image producer.
 813      * @param     producer the image producer to be used.
 814      * @return    an image with the specified image producer.
 815      * @see       java.awt.Image
 816      * @see       java.awt.image.ImageProducer
 817      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 818      */
 819     public abstract Image createImage(ImageProducer producer);
 820 
 821     /**
 822      * Creates an image which decodes the image stored in the specified
 823      * byte array.
 824      * <p>
 825      * The data must be in some image format, such as GIF or JPEG,
 826      * that is supported by this toolkit.
 827      * @param     imagedata   an array of bytes, representing
 828      *                         image data in a supported image format.
 829      * @return    an image.
 830      * @since     1.1
 831      */
 832     public Image createImage(byte[] imagedata) {
 833         return createImage(imagedata, 0, imagedata.length);
 834     }
 835 
 836     /**
 837      * Creates an image which decodes the image stored in the specified
 838      * byte array, and at the specified offset and length.
 839      * The data must be in some image format, such as GIF or JPEG,
 840      * that is supported by this toolkit.
 841      * @param     imagedata   an array of bytes, representing
 842      *                         image data in a supported image format.
 843      * @param     imageoffset  the offset of the beginning
 844      *                         of the data in the array.
 845      * @param     imagelength  the length of the data in the array.
 846      * @return    an image.
 847      * @since     1.1
 848      */
 849     public abstract Image createImage(byte[] imagedata,
 850                                       int imageoffset,
 851                                       int imagelength);
 852 
 853     /**
 854      * Gets a {@code PrintJob} object which is the result of initiating
 855      * a print operation on the toolkit's platform.
 856      * <p>
 857      * Each actual implementation of this method should first check if there
 858      * is a security manager installed. If there is, the method should call
 859      * the security manager's {@code checkPrintJobAccess} method to
 860      * ensure initiation of a print operation is allowed. If the default
 861      * implementation of {@code checkPrintJobAccess} is used (that is,
 862      * that method is not overriden), then this results in a call to the
 863      * security manager's {@code checkPermission} method with a
 864      * {@code RuntimePermission("queuePrintJob")} permission.
 865      *
 866      * @param   frame the parent of the print dialog. May not be null.
 867      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 868      *          to "".
 869      * @param   props a Properties object containing zero or more properties.
 870      *          Properties are not standardized and are not consistent across
 871      *          implementations. Because of this, PrintJobs which require job
 872      *          and page control should use the version of this function which
 873      *          takes JobAttributes and PageAttributes objects. This object
 874      *          may be updated to reflect the user's job choices on exit. May
 875      *          be null.
 876      * @return  a {@code PrintJob} object, or {@code null} if the
 877      *          user cancelled the print job.
 878      * @throws  NullPointerException if frame is null
 879      * @throws  SecurityException if this thread is not allowed to initiate a
 880      *          print job request
 881      * @see     java.awt.GraphicsEnvironment#isHeadless
 882      * @see     java.awt.PrintJob
 883      * @see     java.lang.RuntimePermission
 884      * @since   1.1
 885      */
 886     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 887                                          Properties props);
 888 
 889     /**
 890      * Gets a {@code PrintJob} object which is the result of initiating
 891      * a print operation on the toolkit's platform.
 892      * <p>
 893      * Each actual implementation of this method should first check if there
 894      * is a security manager installed. If there is, the method should call
 895      * the security manager's {@code checkPrintJobAccess} method to
 896      * ensure initiation of a print operation is allowed. If the default
 897      * implementation of {@code checkPrintJobAccess} is used (that is,
 898      * that method is not overriden), then this results in a call to the
 899      * security manager's {@code checkPermission} method with a
 900      * {@code RuntimePermission("queuePrintJob")} permission.
 901      *
 902      * @param   frame the parent of the print dialog. May not be null.
 903      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 904      *          to "".
 905      * @param   jobAttributes a set of job attributes which will control the
 906      *          PrintJob. The attributes will be updated to reflect the user's
 907      *          choices as outlined in the JobAttributes documentation. May be
 908      *          null.
 909      * @param   pageAttributes a set of page attributes which will control the
 910      *          PrintJob. The attributes will be applied to every page in the
 911      *          job. The attributes will be updated to reflect the user's
 912      *          choices as outlined in the PageAttributes documentation. May be
 913      *          null.
 914      * @return  a {@code PrintJob} object, or {@code null} if the
 915      *          user cancelled the print job.
 916      * @throws  NullPointerException if frame is null
 917      * @throws  IllegalArgumentException if pageAttributes specifies differing
 918      *          cross feed and feed resolutions. Also if this thread has
 919      *          access to the file system and jobAttributes specifies
 920      *          print to file, and the specified destination file exists but
 921      *          is a directory rather than a regular file, does not exist but
 922      *          cannot be created, or cannot be opened for any other reason.
 923      *          However in the case of print to file, if a dialog is also
 924      *          requested to be displayed then the user will be given an
 925      *          opportunity to select a file and proceed with printing.
 926      *          The dialog will ensure that the selected output file
 927      *          is valid before returning from this method.
 928      * @throws  SecurityException if this thread is not allowed to initiate a
 929      *          print job request, or if jobAttributes specifies print to file,
 930      *          and this thread is not allowed to access the file system
 931      * @see     java.awt.PrintJob
 932      * @see     java.awt.GraphicsEnvironment#isHeadless
 933      * @see     java.lang.RuntimePermission
 934      * @see     java.awt.JobAttributes
 935      * @see     java.awt.PageAttributes
 936      * @since   1.3
 937      */
 938     public PrintJob getPrintJob(Frame frame, String jobtitle,
 939                                 JobAttributes jobAttributes,
 940                                 PageAttributes pageAttributes) {
 941         // Override to add printing support with new job/page control classes
 942 
 943         if (this != Toolkit.getDefaultToolkit()) {
 944             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 945                                                            jobAttributes,
 946                                                            pageAttributes);
 947         } else {
 948             return getPrintJob(frame, jobtitle, null);
 949         }
 950     }
 951 
 952     /**
 953      * Emits an audio beep depending on native system settings and hardware
 954      * capabilities.
 955      * @since     1.1
 956      */
 957     public abstract void beep();
 958 
 959     /**
 960      * Gets the singleton instance of the system Clipboard which interfaces
 961      * with clipboard facilities provided by the native platform. This
 962      * clipboard enables data transfer between Java programs and native
 963      * applications which use native clipboard facilities.
 964      * <p>
 965      * In addition to any and all default formats text returned by the system
 966      * Clipboard's {@code getTransferData()} method is available in the
 967      * following flavors:
 968      * <ul>
 969      * <li>DataFlavor.stringFlavor</li>
 970      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 971      * </ul>
 972      * As with {@code java.awt.datatransfer.StringSelection}, if the
 973      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 974      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 975      * the system Clipboard's {@code getTransferData()} method for
 976      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 977      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 978      * Because of this, support for
 979      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 980      * <b>deprecated</b>.
 981      * <p>
 982      * Each actual implementation of this method should first check if there
 983      * is a security manager installed. If there is, the method should call
 984      * the security manager's {@link SecurityManager#checkPermission
 985      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 986      *
 987      * @return    the system Clipboard
 988      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 989      * returns true
 990      * @see       java.awt.GraphicsEnvironment#isHeadless
 991      * @see       java.awt.datatransfer.Clipboard
 992      * @see       java.awt.datatransfer.StringSelection
 993      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
 994      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
 995      * @see       java.io.Reader
 996      * @see       java.awt.AWTPermission
 997      * @since     1.1
 998      */
 999     public abstract Clipboard getSystemClipboard()
1000         throws HeadlessException;
1001 
1002     /**
1003      * Gets the singleton instance of the system selection as a
1004      * {@code Clipboard} object. This allows an application to read and
1005      * modify the current, system-wide selection.
1006      * <p>
1007      * An application is responsible for updating the system selection whenever
1008      * the user selects text, using either the mouse or the keyboard.
1009      * Typically, this is implemented by installing a
1010      * {@code FocusListener} on all {@code Component}s which support
1011      * text selection, and, between {@code FOCUS_GAINED} and
1012      * {@code FOCUS_LOST} events delivered to that {@code Component},
1013      * updating the system selection {@code Clipboard} when the selection
1014      * changes inside the {@code Component}. Properly updating the system
1015      * selection ensures that a Java application will interact correctly with
1016      * native applications and other Java applications running simultaneously
1017      * on the system. Note that {@code java.awt.TextComponent} and
1018      * {@code javax.swing.text.JTextComponent} already adhere to this
1019      * policy. When using these classes, and their subclasses, developers need
1020      * not write any additional code.
1021      * <p>
1022      * Some platforms do not support a system selection {@code Clipboard}.
1023      * On those platforms, this method will return {@code null}. In such a
1024      * case, an application is absolved from its responsibility to update the
1025      * system selection {@code Clipboard} as described above.
1026      * <p>
1027      * Each actual implementation of this method should first check if there
1028      * is a security manager installed. If there is, the method should call
1029      * the security manager's {@link SecurityManager#checkPermission
1030      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1031      *
1032      * @return the system selection as a {@code Clipboard}, or
1033      *         {@code null} if the native platform does not support a
1034      *         system selection {@code Clipboard}
1035      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1036      *            returns true
1037      *
1038      * @see java.awt.datatransfer.Clipboard
1039      * @see java.awt.event.FocusListener
1040      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1041      * @see java.awt.event.FocusEvent#FOCUS_LOST
1042      * @see TextComponent
1043      * @see javax.swing.text.JTextComponent
1044      * @see AWTPermission
1045      * @see GraphicsEnvironment#isHeadless
1046      * @since 1.4
1047      */
1048     public Clipboard getSystemSelection() throws HeadlessException {
1049         GraphicsEnvironment.checkHeadless();
1050 
1051         if (this != Toolkit.getDefaultToolkit()) {
1052             return Toolkit.getDefaultToolkit().getSystemSelection();
1053         } else {
1054             GraphicsEnvironment.checkHeadless();
1055             return null;
1056         }
1057     }
1058 
1059     /**
1060      * Determines which modifier key is the appropriate accelerator
1061      * key for menu shortcuts.
1062      * <p>
1063      * Menu shortcuts, which are embodied in the
1064      * {@code MenuShortcut} class, are handled by the
1065      * {@code MenuBar} class.
1066      * <p>
1067      * By default, this method returns {@code Event.CTRL_MASK}.
1068      * Toolkit implementations should override this method if the
1069      * <b>Control</b> key isn't the correct key for accelerators.
1070      * @return    the modifier mask on the {@code Event} class
1071      *                 that is used for menu shortcuts on this toolkit.
1072      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1073      * returns true
1074      * @see       java.awt.GraphicsEnvironment#isHeadless
1075      * @see       java.awt.MenuBar
1076      * @see       java.awt.MenuShortcut
1077      * @deprecated It is recommended that extended modifier keys and
1078      *             {@link #getMenuShortcutKeyMaskEx()} be used instead
1079      * @since     1.1
1080      */
1081     @Deprecated(since = "10")
1082     public int getMenuShortcutKeyMask() throws HeadlessException {
1083         GraphicsEnvironment.checkHeadless();
1084 
1085         return Event.CTRL_MASK;
1086     }
1087 
1088     /**
1089      * Determines which extended modifier key is the appropriate accelerator
1090      * key for menu shortcuts.
1091      * <p>
1092      * Menu shortcuts, which are embodied in the {@code MenuShortcut} class, are
1093      * handled by the {@code MenuBar} class.
1094      * <p>
1095      * By default, this method returns {@code InputEvent.CTRL_DOWN_MASK}.
1096      * Toolkit implementations should override this method if the
1097      * <b>Control</b> key isn't the correct key for accelerators.
1098      *
1099      * @return the modifier mask on the {@code InputEvent} class that is used
1100      *         for menu shortcuts on this toolkit
1101      * @throws HeadlessException if GraphicsEnvironment.isHeadless() returns
1102      *         true
1103      * @see java.awt.GraphicsEnvironment#isHeadless
1104      * @see java.awt.MenuBar
1105      * @see java.awt.MenuShortcut
1106      * @since 10
1107      */
1108     public int getMenuShortcutKeyMaskEx() throws HeadlessException {
1109         GraphicsEnvironment.checkHeadless();
1110 
1111         return InputEvent.CTRL_DOWN_MASK;
1112     }
1113 
1114     /**
1115      * Returns whether the given locking key on the keyboard is currently in
1116      * its "on" state.
1117      * Valid key codes are
1118      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1119      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1120      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1121      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1122      *
1123      * @param  keyCode the key code
1124      * @return {@code true} if the given key is currently in its "on" state;
1125      *          otherwise {@code false}
1126      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1127      * is not one of the valid key codes
1128      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1129      * allow getting the state of this key programmatically, or if the keyboard
1130      * doesn't have this key
1131      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1132      * returns true
1133      * @see       java.awt.GraphicsEnvironment#isHeadless
1134      * @since 1.3
1135      */
1136     public boolean getLockingKeyState(int keyCode)
1137         throws UnsupportedOperationException
1138     {
1139         GraphicsEnvironment.checkHeadless();
1140 
1141         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1142                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1143             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1144         }
1145         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1146     }
1147 
1148     /**
1149      * Sets the state of the given locking key on the keyboard.
1150      * Valid key codes are
1151      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1152      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1153      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1154      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1155      * <p>
1156      * Depending on the platform, setting the state of a locking key may
1157      * involve event processing and therefore may not be immediately
1158      * observable through getLockingKeyState.
1159      *
1160      * @param  keyCode the key code
1161      * @param  on the state of the key
1162      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1163      * is not one of the valid key codes
1164      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1165      * allow setting the state of this key programmatically, or if the keyboard
1166      * doesn't have this key
1167      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1168      * returns true
1169      * @see       java.awt.GraphicsEnvironment#isHeadless
1170      * @since 1.3
1171      */
1172     public void setLockingKeyState(int keyCode, boolean on)
1173         throws UnsupportedOperationException
1174     {
1175         GraphicsEnvironment.checkHeadless();
1176 
1177         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1178                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1179             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1180         }
1181         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1182     }
1183 
1184     /**
1185      * Give native peers the ability to query the native container
1186      * given a native component (eg the direct parent may be lightweight).
1187      *
1188      * @param  c the component to fetch the container for
1189      * @return the native container object for the component
1190      */
1191     protected static Container getNativeContainer(Component c) {
1192         return c.getNativeContainer();
1193     }
1194 
1195     /**
1196      * Creates a new custom cursor object.
1197      * If the image to display is invalid, the cursor will be hidden (made
1198      * completely transparent), and the hotspot will be set to (0, 0).
1199      *
1200      * <p>Note that multi-frame images are invalid and may cause this
1201      * method to hang.
1202      *
1203      * @param cursor the image to display when the cursor is activated
1204      * @param hotSpot the X and Y of the large cursor's hot spot; the
1205      *   hotSpot values must be less than the Dimension returned by
1206      *   {@code getBestCursorSize}
1207      * @param     name a localized description of the cursor, for Java Accessibility use
1208      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1209      *   the bounds of the cursor
1210      * @return the cursor created
1211      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1212      * returns true
1213      * @see       java.awt.GraphicsEnvironment#isHeadless
1214      * @since     1.2
1215      */
1216     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1217         throws IndexOutOfBoundsException, HeadlessException
1218     {
1219         // Override to implement custom cursor support.
1220         if (this != Toolkit.getDefaultToolkit()) {
1221             return Toolkit.getDefaultToolkit().
1222                 createCustomCursor(cursor, hotSpot, name);
1223         } else {
1224             return new Cursor(Cursor.DEFAULT_CURSOR);
1225         }
1226     }
1227 
1228     /**
1229      * Returns the supported cursor dimension which is closest to the desired
1230      * sizes.  Systems which only support a single cursor size will return that
1231      * size regardless of the desired sizes.  Systems which don't support custom
1232      * cursors will return a dimension of 0, 0. <p>
1233      * Note:  if an image is used whose dimensions don't match a supported size
1234      * (as returned by this method), the Toolkit implementation will attempt to
1235      * resize the image to a supported size.
1236      * Since converting low-resolution images is difficult,
1237      * no guarantees are made as to the quality of a cursor image which isn't a
1238      * supported size.  It is therefore recommended that this method
1239      * be called and an appropriate image used so no image conversion is made.
1240      *
1241      * @param     preferredWidth the preferred cursor width the component would like
1242      * to use.
1243      * @param     preferredHeight the preferred cursor height the component would like
1244      * to use.
1245      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1246      * the Toolkit implementation doesn't support custom cursors.
1247      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1248      * returns true
1249      * @see       java.awt.GraphicsEnvironment#isHeadless
1250      * @since     1.2
1251      */
1252     public Dimension getBestCursorSize(int preferredWidth,
1253         int preferredHeight) throws HeadlessException {
1254         GraphicsEnvironment.checkHeadless();
1255 
1256         // Override to implement custom cursor support.
1257         if (this != Toolkit.getDefaultToolkit()) {
1258             return Toolkit.getDefaultToolkit().
1259                 getBestCursorSize(preferredWidth, preferredHeight);
1260         } else {
1261             return new Dimension(0, 0);
1262         }
1263     }
1264 
1265     /**
1266      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1267      * palette.<p>
1268      * Note: if an image is used which has more colors in its palette than
1269      * the supported maximum, the Toolkit implementation will attempt to flatten the
1270      * palette to the maximum.  Since converting low-resolution images is difficult,
1271      * no guarantees are made as to the quality of a cursor image which has more
1272      * colors than the system supports.  It is therefore recommended that this method
1273      * be called and an appropriate image used so no image conversion is made.
1274      *
1275      * @return    the maximum number of colors, or zero if custom cursors are not
1276      * supported by this Toolkit implementation.
1277      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1278      * returns true
1279      * @see       java.awt.GraphicsEnvironment#isHeadless
1280      * @since     1.2
1281      */
1282     public int getMaximumCursorColors() throws HeadlessException {
1283         GraphicsEnvironment.checkHeadless();
1284 
1285         // Override to implement custom cursor support.
1286         if (this != Toolkit.getDefaultToolkit()) {
1287             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1288         } else {
1289             return 0;
1290         }
1291     }
1292 
1293     /**
1294      * Returns whether Toolkit supports this state for
1295      * {@code Frame}s.  This method tells whether the <em>UI
1296      * concept</em> of, say, maximization or iconification is
1297      * supported.  It will always return false for "compound" states
1298      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1299      * In other words, the rule of thumb is that only queries with a
1300      * single frame state constant as an argument are meaningful.
1301      * <p>Note that supporting a given concept is a platform-
1302      * dependent feature. Due to native limitations the Toolkit
1303      * object may report a particular state as supported, however at
1304      * the same time the Toolkit object will be unable to apply the
1305      * state to a given frame.  This circumstance has two following
1306      * consequences:
1307      * <ul>
1308      * <li>Only the return value of {@code false} for the present
1309      * method actually indicates that the given state is not
1310      * supported. If the method returns {@code true} the given state
1311      * may still be unsupported and/or unavailable for a particular
1312      * frame.
1313      * <li>The developer should consider examining the value of the
1314      * {@link java.awt.event.WindowEvent#getNewState} method of the
1315      * {@code WindowEvent} received through the {@link
1316      * java.awt.event.WindowStateListener}, rather than assuming
1317      * that the state given to the {@code setExtendedState()} method
1318      * will be definitely applied. For more information see the
1319      * documentation for the {@link Frame#setExtendedState} method.
1320      * </ul>
1321      *
1322      * @param state one of named frame state constants.
1323      * @return {@code true} is this frame state is supported by
1324      *     this Toolkit implementation, {@code false} otherwise.
1325      * @exception HeadlessException
1326      *     if {@code GraphicsEnvironment.isHeadless()}
1327      *     returns {@code true}.
1328      * @see java.awt.Window#addWindowStateListener
1329      * @since   1.4
1330      */
1331     public boolean isFrameStateSupported(int state)
1332         throws HeadlessException
1333     {
1334         GraphicsEnvironment.checkHeadless();
1335 
1336         if (this != Toolkit.getDefaultToolkit()) {
1337             return Toolkit.getDefaultToolkit().
1338                 isFrameStateSupported(state);
1339         } else {
1340             return (state == Frame.NORMAL); // others are not guaranteed
1341         }
1342     }
1343 
1344     /**
1345      * Support for I18N: any visible strings should be stored in
1346      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1347      * here, so that only one copy is maintained.
1348      */
1349     private static ResourceBundle resources;
1350     private static ResourceBundle platformResources;
1351 
1352     // called by platform toolkit
1353     private static void setPlatformResources(ResourceBundle bundle) {
1354         platformResources = bundle;
1355     }
1356 
1357     /**
1358      * Initialize JNI field and method ids
1359      */
1360     private static native void initIDs();
1361 
1362     /**
1363      * WARNING: This is a temporary workaround for a problem in the
1364      * way the AWT loads native libraries. A number of classes in the
1365      * AWT package have a native method, initIDs(), which initializes
1366      * the JNI field and method ids used in the native portion of
1367      * their implementation.
1368      *
1369      * Since the use and storage of these ids is done by the
1370      * implementation libraries, the implementation of these method is
1371      * provided by the particular AWT implementations (for example,
1372      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1373      * problem is that this means that the native libraries must be
1374      * loaded by the java.* classes, which do not necessarily know the
1375      * names of the libraries to load. A better way of doing this
1376      * would be to provide a separate library which defines java.awt.*
1377      * initIDs, and exports the relevant symbols out to the
1378      * implementation libraries.
1379      *
1380      * For now, we know it's done by the implementation, and we assume
1381      * that the name of the library is "awt".  -br.
1382      *
1383      * If you change loadLibraries(), please add the change to
1384      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1385      * classes can be loaded in java.awt.image that depend on
1386      * libawt and there is no way to call Toolkit.loadLibraries()
1387      * directly.  -hung
1388      */
1389     private static boolean loaded = false;
1390     static void loadLibraries() {
1391         if (!loaded) {
1392             java.security.AccessController.doPrivileged(
1393                 new java.security.PrivilegedAction<Void>() {
1394                     public Void run() {
1395                         System.loadLibrary("awt");
1396                         return null;
1397                     }
1398                 });
1399             loaded = true;
1400         }
1401     }
1402 
1403     static {
1404         AWTAccessor.setToolkitAccessor(
1405                 new AWTAccessor.ToolkitAccessor() {
1406                     @Override
1407                     public void setPlatformResources(ResourceBundle bundle) {
1408                         Toolkit.setPlatformResources(bundle);
1409                     }
1410                 });
1411 
1412         java.security.AccessController.doPrivileged(
1413                                  new java.security.PrivilegedAction<Void>() {
1414             public Void run() {
1415                 try {
1416                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1417                 } catch (MissingResourceException e) {
1418                     // No resource file; defaults will be used.
1419                 }
1420                 return null;
1421             }
1422         });
1423 
1424         // ensure that the proper libraries are loaded
1425         loadLibraries();
1426         initAssistiveTechnologies();
1427         initIDs();
1428     }
1429 
1430     /**
1431      * Gets a property with the specified key and default.
1432      * This method returns defaultValue if the property is not found.
1433      *
1434      * @param  key the key
1435      * @param  defaultValue the default value
1436      * @return the value of the property or the default value
1437      *         if the property was not found
1438      */
1439     public static String getProperty(String key, String defaultValue) {
1440         // first try platform specific bundle
1441         if (platformResources != null) {
1442             try {
1443                 return platformResources.getString(key);
1444             }
1445             catch (MissingResourceException e) {}
1446         }
1447 
1448         // then shared one
1449         if (resources != null) {
1450             try {
1451                 return resources.getString(key);
1452             }
1453             catch (MissingResourceException e) {}
1454         }
1455 
1456         return defaultValue;
1457     }
1458 
1459     /**
1460      * Get the application's or applet's EventQueue instance.
1461      * Depending on the Toolkit implementation, different EventQueues
1462      * may be returned for different applets.  Applets should
1463      * therefore not assume that the EventQueue instance returned
1464      * by this method will be shared by other applets or the system.
1465      *
1466      * <p> If there is a security manager then its
1467      * {@link SecurityManager#checkPermission checkPermission} method
1468      * is called to check {@code AWTPermission("accessEventQueue")}.
1469      *
1470      * @return    the {@code EventQueue} object
1471      * @throws  SecurityException
1472      *          if a security manager is set and it denies access to
1473      *          the {@code EventQueue}
1474      * @see     java.awt.AWTPermission
1475     */
1476     public final EventQueue getSystemEventQueue() {
1477         SecurityManager security = System.getSecurityManager();
1478         if (security != null) {
1479             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1480         }
1481         return getSystemEventQueueImpl();
1482     }
1483 
1484     /**
1485      * Gets the application's or applet's {@code EventQueue}
1486      * instance, without checking access.  For security reasons,
1487      * this can only be called from a {@code Toolkit} subclass.
1488      * @return the {@code EventQueue} object
1489      */
1490     protected abstract EventQueue getSystemEventQueueImpl();
1491 
1492     /* Accessor method for use by AWT package routines. */
1493     static EventQueue getEventQueue() {
1494         return getDefaultToolkit().getSystemEventQueueImpl();
1495     }
1496 
1497     /**
1498      * Creates a concrete, platform dependent, subclass of the abstract
1499      * DragGestureRecognizer class requested, and associates it with the
1500      * DragSource, Component and DragGestureListener specified.
1501      *
1502      * subclasses should override this to provide their own implementation
1503      *
1504      * @param <T> the type of DragGestureRecognizer to create
1505      * @param abstractRecognizerClass The abstract class of the required recognizer
1506      * @param ds                      The DragSource
1507      * @param c                       The Component target for the DragGestureRecognizer
1508      * @param srcActions              The actions permitted for the gesture
1509      * @param dgl                     The DragGestureListener
1510      *
1511      * @return the new object or null.  Always returns null if
1512      * GraphicsEnvironment.isHeadless() returns true.
1513      * @see java.awt.GraphicsEnvironment#isHeadless
1514      */
1515     public <T extends DragGestureRecognizer> T
1516         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1517                                     DragSource ds, Component c, int srcActions,
1518                                     DragGestureListener dgl)
1519     {
1520         return null;
1521     }
1522 
1523     /**
1524      * Obtains a value for the specified desktop property.
1525      *
1526      * A desktop property is a uniquely named value for a resource that
1527      * is Toolkit global in nature. Usually it also is an abstract
1528      * representation for an underlying platform dependent desktop setting.
1529      * For more information on desktop properties supported by the AWT see
1530      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1531      *
1532      * @param  propertyName the property name
1533      * @return the value for the specified desktop property
1534      */
1535     public final synchronized Object getDesktopProperty(String propertyName) {
1536         // This is a workaround for headless toolkits.  It would be
1537         // better to override this method but it is declared final.
1538         // "this instanceof" syntax defeats polymorphism.
1539         // --mm, 03/03/00
1540         if (this instanceof HeadlessToolkit) {
1541             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1542                 .getDesktopProperty(propertyName);
1543         }
1544 
1545         if (desktopProperties.isEmpty()) {
1546             initializeDesktopProperties();
1547         }
1548 
1549         Object value;
1550 
1551         // This property should never be cached
1552         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1553             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1554         }
1555 
1556         value = desktopProperties.get(propertyName);
1557 
1558         if (value == null) {
1559             value = lazilyLoadDesktopProperty(propertyName);
1560 
1561             if (value != null) {
1562                 setDesktopProperty(propertyName, value);
1563             }
1564         }
1565 
1566         /* for property "awt.font.desktophints" */
1567         if (value instanceof RenderingHints) {
1568             value = ((RenderingHints)value).clone();
1569         }
1570 
1571         return value;
1572     }
1573 
1574     /**
1575      * Sets the named desktop property to the specified value and fires a
1576      * property change event to notify any listeners that the value has changed.
1577      *
1578      * @param  name the property name
1579      * @param  newValue the new property value
1580      */
1581     protected final void setDesktopProperty(String name, Object newValue) {
1582         // This is a workaround for headless toolkits.  It would be
1583         // better to override this method but it is declared final.
1584         // "this instanceof" syntax defeats polymorphism.
1585         // --mm, 03/03/00
1586         if (this instanceof HeadlessToolkit) {
1587             ((HeadlessToolkit)this).getUnderlyingToolkit()
1588                 .setDesktopProperty(name, newValue);
1589             return;
1590         }
1591         Object oldValue;
1592 
1593         synchronized (this) {
1594             oldValue = desktopProperties.get(name);
1595             desktopProperties.put(name, newValue);
1596         }
1597 
1598         // Don't fire change event if old and new values are null.
1599         // It helps to avoid recursive resending of WM_THEMECHANGED
1600         if (oldValue != null || newValue != null) {
1601             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1602         }
1603     }
1604 
1605     /**
1606      * An opportunity to lazily evaluate desktop property values.
1607      * @return the desktop property or null
1608      * @param name the name
1609      */
1610     protected Object lazilyLoadDesktopProperty(String name) {
1611         return null;
1612     }
1613 
1614     /**
1615      * initializeDesktopProperties
1616      */
1617     protected void initializeDesktopProperties() {
1618     }
1619 
1620     /**
1621      * Adds the specified property change listener for the named desktop
1622      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1623      * its property name is ignored, and the wrapped listener is added.
1624      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1625      * no exception is thrown and no action is performed.
1626      *
1627      * @param   name The name of the property to listen for
1628      * @param   pcl The property change listener
1629      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1630                 PropertyChangeListener)
1631      * @since   1.2
1632      */
1633     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1634         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1635     }
1636 
1637     /**
1638      * Removes the specified property change listener for the named
1639      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1640      * is removed, its property name is ignored, and
1641      * the wrapped listener is removed.
1642      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1643      * no exception is thrown and no action is performed.
1644      *
1645      * @param   name The name of the property to remove
1646      * @param   pcl The property change listener
1647      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1648                 PropertyChangeListener)
1649      * @since   1.2
1650      */
1651     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1652         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1653     }
1654 
1655     /**
1656      * Returns an array of all the property change listeners
1657      * registered on this toolkit. The returned array
1658      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1659      * that associate listeners with the names of desktop properties.
1660      *
1661      * @return all of this toolkit's {@link PropertyChangeListener}
1662      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1663      *         or an empty array  if no listeners are added
1664      *
1665      * @see PropertyChangeSupport#getPropertyChangeListeners()
1666      * @since 1.4
1667      */
1668     public PropertyChangeListener[] getPropertyChangeListeners() {
1669         return desktopPropsSupport.getPropertyChangeListeners();
1670     }
1671 
1672     /**
1673      * Returns an array of all property change listeners
1674      * associated with the specified name of a desktop property.
1675      *
1676      * @param  propertyName the named property
1677      * @return all of the {@code PropertyChangeListener} objects
1678      *         associated with the specified name of a desktop property
1679      *         or an empty array if no such listeners are added
1680      *
1681      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1682      * @since 1.4
1683      */
1684     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1685         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1686     }
1687 
1688     /**
1689      * The desktop properties.
1690      */
1691     protected final Map<String,Object> desktopProperties =
1692             new HashMap<String,Object>();
1693     /**
1694      * The desktop properties change support.
1695      */
1696     protected final PropertyChangeSupport desktopPropsSupport =
1697             Toolkit.createPropertyChangeSupport(this);
1698 
1699     /**
1700      * Returns whether the always-on-top mode is supported by this toolkit.
1701      * To detect whether the always-on-top mode is supported for a
1702      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1703      * @return {@code true}, if current toolkit supports the always-on-top mode,
1704      *     otherwise returns {@code false}
1705      * @see Window#isAlwaysOnTopSupported
1706      * @see Window#setAlwaysOnTop(boolean)
1707      * @since 1.6
1708      */
1709     public boolean isAlwaysOnTopSupported() {
1710         return true;
1711     }
1712 
1713     /**
1714      * Returns whether the given modality type is supported by this toolkit. If
1715      * a dialog with unsupported modality type is created, then
1716      * {@code Dialog.ModalityType.MODELESS} is used instead.
1717      *
1718      * @param modalityType modality type to be checked for support by this toolkit
1719      *
1720      * @return {@code true}, if current toolkit supports given modality
1721      *     type, {@code false} otherwise
1722      *
1723      * @see java.awt.Dialog.ModalityType
1724      * @see java.awt.Dialog#getModalityType
1725      * @see java.awt.Dialog#setModalityType
1726      *
1727      * @since 1.6
1728      */
1729     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1730 
1731     /**
1732      * Returns whether the given modal exclusion type is supported by this
1733      * toolkit. If an unsupported modal exclusion type property is set on a window,
1734      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1735      *
1736      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1737      *
1738      * @return {@code true}, if current toolkit supports given modal exclusion
1739      *     type, {@code false} otherwise
1740      *
1741      * @see java.awt.Dialog.ModalExclusionType
1742      * @see java.awt.Window#getModalExclusionType
1743      * @see java.awt.Window#setModalExclusionType
1744      *
1745      * @since 1.6
1746      */
1747     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1748 
1749     // 8014718: logging has been removed from SunToolkit
1750 
1751     private static final int LONG_BITS = 64;
1752     private int[] calls = new int[LONG_BITS];
1753     private static volatile long enabledOnToolkitMask;
1754     private AWTEventListener eventListener = null;
1755     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1756 
1757     /*
1758      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1759      * if the listener is proxied.
1760      */
1761     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1762     {
1763         AWTEventListener localL = l;
1764 
1765         if (localL == null) {
1766             return null;
1767         }
1768         // if user passed in a AWTEventListenerProxy object, extract
1769         // the listener
1770         if (l instanceof AWTEventListenerProxy) {
1771             localL = ((AWTEventListenerProxy)l).getListener();
1772         }
1773         return localL;
1774     }
1775 
1776     /**
1777      * Adds an AWTEventListener to receive all AWTEvents dispatched
1778      * system-wide that conform to the given {@code eventMask}.
1779      * <p>
1780      * First, if there is a security manager, its {@code checkPermission}
1781      * method is called with an
1782      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1783      * This may result in a SecurityException.
1784      * <p>
1785      * {@code eventMask} is a bitmask of event types to receive.
1786      * It is constructed by bitwise OR-ing together the event masks
1787      * defined in {@code AWTEvent}.
1788      * <p>
1789      * Note:  event listener use is not recommended for normal
1790      * application use, but are intended solely to support special
1791      * purpose facilities including support for accessibility,
1792      * event record/playback, and diagnostic tracing.
1793      *
1794      * If listener is null, no exception is thrown and no action is performed.
1795      *
1796      * @param    listener   the event listener.
1797      * @param    eventMask  the bitmask of event types to receive
1798      * @throws SecurityException
1799      *        if a security manager exists and its
1800      *        {@code checkPermission} method doesn't allow the operation.
1801      * @see      #removeAWTEventListener
1802      * @see      #getAWTEventListeners
1803      * @see      SecurityManager#checkPermission
1804      * @see      java.awt.AWTEvent
1805      * @see      java.awt.AWTPermission
1806      * @see      java.awt.event.AWTEventListener
1807      * @see      java.awt.event.AWTEventListenerProxy
1808      * @since    1.2
1809      */
1810     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1811         AWTEventListener localL = deProxyAWTEventListener(listener);
1812 
1813         if (localL == null) {
1814             return;
1815         }
1816         SecurityManager security = System.getSecurityManager();
1817         if (security != null) {
1818           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1819         }
1820         synchronized (this) {
1821             SelectiveAWTEventListener selectiveListener =
1822                 listener2SelectiveListener.get(localL);
1823 
1824             if (selectiveListener == null) {
1825                 // Create a new selectiveListener.
1826                 selectiveListener = new SelectiveAWTEventListener(localL,
1827                                                                  eventMask);
1828                 listener2SelectiveListener.put(localL, selectiveListener);
1829                 eventListener = ToolkitEventMulticaster.add(eventListener,
1830                                                             selectiveListener);
1831             }
1832             // OR the eventMask into the selectiveListener's event mask.
1833             selectiveListener.orEventMasks(eventMask);
1834 
1835             enabledOnToolkitMask |= eventMask;
1836 
1837             long mask = eventMask;
1838             for (int i=0; i<LONG_BITS; i++) {
1839                 // If no bits are set, break out of loop.
1840                 if (mask == 0) {
1841                     break;
1842                 }
1843                 if ((mask & 1L) != 0) {  // Always test bit 0.
1844                     calls[i]++;
1845                 }
1846                 mask >>>= 1;  // Right shift, fill with zeros on left.
1847             }
1848         }
1849     }
1850 
1851     /**
1852      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1853      * <p>
1854      * First, if there is a security manager, its {@code checkPermission}
1855      * method is called with an
1856      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1857      * This may result in a SecurityException.
1858      * <p>
1859      * Note:  event listener use is not recommended for normal
1860      * application use, but are intended solely to support special
1861      * purpose facilities including support for accessibility,
1862      * event record/playback, and diagnostic tracing.
1863      *
1864      * If listener is null, no exception is thrown and no action is performed.
1865      *
1866      * @param    listener   the event listener.
1867      * @throws SecurityException
1868      *        if a security manager exists and its
1869      *        {@code checkPermission} method doesn't allow the operation.
1870      * @see      #addAWTEventListener
1871      * @see      #getAWTEventListeners
1872      * @see      SecurityManager#checkPermission
1873      * @see      java.awt.AWTEvent
1874      * @see      java.awt.AWTPermission
1875      * @see      java.awt.event.AWTEventListener
1876      * @see      java.awt.event.AWTEventListenerProxy
1877      * @since    1.2
1878      */
1879     public void removeAWTEventListener(AWTEventListener listener) {
1880         AWTEventListener localL = deProxyAWTEventListener(listener);
1881 
1882         if (listener == null) {
1883             return;
1884         }
1885         SecurityManager security = System.getSecurityManager();
1886         if (security != null) {
1887             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1888         }
1889 
1890         synchronized (this) {
1891             SelectiveAWTEventListener selectiveListener =
1892                 listener2SelectiveListener.get(localL);
1893 
1894             if (selectiveListener != null) {
1895                 listener2SelectiveListener.remove(localL);
1896                 int[] listenerCalls = selectiveListener.getCalls();
1897                 for (int i=0; i<LONG_BITS; i++) {
1898                     calls[i] -= listenerCalls[i];
1899                     assert calls[i] >= 0: "Negative Listeners count";
1900 
1901                     if (calls[i] == 0) {
1902                         enabledOnToolkitMask &= ~(1L<<i);
1903                     }
1904                 }
1905             }
1906             eventListener = ToolkitEventMulticaster.remove(eventListener,
1907             (selectiveListener == null) ? localL : selectiveListener);
1908         }
1909     }
1910 
1911     static boolean enabledOnToolkit(long eventMask) {
1912         return (enabledOnToolkitMask & eventMask) != 0;
1913         }
1914 
1915     synchronized int countAWTEventListeners(long eventMask) {
1916         int ci = 0;
1917         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1918         }
1919         ci--;
1920         return calls[ci];
1921     }
1922     /**
1923      * Returns an array of all the {@code AWTEventListener}s
1924      * registered on this toolkit.
1925      * If there is a security manager, its {@code checkPermission}
1926      * method is called with an
1927      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1928      * This may result in a SecurityException.
1929      * Listeners can be returned
1930      * within {@code AWTEventListenerProxy} objects, which also contain
1931      * the event mask for the given listener.
1932      * Note that listener objects
1933      * added multiple times appear only once in the returned array.
1934      *
1935      * @return all of the {@code AWTEventListener}s or an empty
1936      *         array if no listeners are currently registered
1937      * @throws SecurityException
1938      *        if a security manager exists and its
1939      *        {@code checkPermission} method doesn't allow the operation.
1940      * @see      #addAWTEventListener
1941      * @see      #removeAWTEventListener
1942      * @see      SecurityManager#checkPermission
1943      * @see      java.awt.AWTEvent
1944      * @see      java.awt.AWTPermission
1945      * @see      java.awt.event.AWTEventListener
1946      * @see      java.awt.event.AWTEventListenerProxy
1947      * @since 1.4
1948      */
1949     public AWTEventListener[] getAWTEventListeners() {
1950         SecurityManager security = System.getSecurityManager();
1951         if (security != null) {
1952             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1953         }
1954         synchronized (this) {
1955             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1956 
1957             AWTEventListener[] ret = new AWTEventListener[la.length];
1958             for (int i = 0; i < la.length; i++) {
1959                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1960                 AWTEventListener tempL = sael.getListener();
1961                 //assert tempL is not an AWTEventListenerProxy - we should
1962                 // have weeded them all out
1963                 // don't want to wrap a proxy inside a proxy
1964                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1965             }
1966             return ret;
1967         }
1968     }
1969 
1970     /**
1971      * Returns an array of all the {@code AWTEventListener}s
1972      * registered on this toolkit which listen to all of the event
1973      * types specified in the {@code eventMask} argument.
1974      * If there is a security manager, its {@code checkPermission}
1975      * method is called with an
1976      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1977      * This may result in a SecurityException.
1978      * Listeners can be returned
1979      * within {@code AWTEventListenerProxy} objects, which also contain
1980      * the event mask for the given listener.
1981      * Note that listener objects
1982      * added multiple times appear only once in the returned array.
1983      *
1984      * @param  eventMask the bitmask of event types to listen for
1985      * @return all of the {@code AWTEventListener}s registered
1986      *         on this toolkit for the specified
1987      *         event types, or an empty array if no such listeners
1988      *         are currently registered
1989      * @throws SecurityException
1990      *        if a security manager exists and its
1991      *        {@code checkPermission} method doesn't allow the operation.
1992      * @see      #addAWTEventListener
1993      * @see      #removeAWTEventListener
1994      * @see      SecurityManager#checkPermission
1995      * @see      java.awt.AWTEvent
1996      * @see      java.awt.AWTPermission
1997      * @see      java.awt.event.AWTEventListener
1998      * @see      java.awt.event.AWTEventListenerProxy
1999      * @since 1.4
2000      */
2001     public AWTEventListener[] getAWTEventListeners(long eventMask) {
2002         SecurityManager security = System.getSecurityManager();
2003         if (security != null) {
2004             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
2005         }
2006         synchronized (this) {
2007             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
2008 
2009             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
2010 
2011             for (int i = 0; i < la.length; i++) {
2012                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2013                 if ((sael.getEventMask() & eventMask) == eventMask) {
2014                     //AWTEventListener tempL = sael.getListener();
2015                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
2016                                                        sael.getListener()));
2017                 }
2018             }
2019             return list.toArray(new AWTEventListener[0]);
2020         }
2021     }
2022 
2023     /*
2024      * This method notifies any AWTEventListeners that an event
2025      * is about to be dispatched.
2026      *
2027      * @param theEvent the event which will be dispatched.
2028      */
2029     void notifyAWTEventListeners(AWTEvent theEvent) {
2030         // This is a workaround for headless toolkits.  It would be
2031         // better to override this method but it is declared package private.
2032         // "this instanceof" syntax defeats polymorphism.
2033         // --mm, 03/03/00
2034         if (this instanceof HeadlessToolkit) {
2035             ((HeadlessToolkit)this).getUnderlyingToolkit()
2036                 .notifyAWTEventListeners(theEvent);
2037             return;
2038         }
2039 
2040         AWTEventListener eventListener = this.eventListener;
2041         if (eventListener != null) {
2042             eventListener.eventDispatched(theEvent);
2043         }
2044     }
2045 
2046     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2047         implements AWTEventListener {
2048         // Implementation cloned from AWTEventMulticaster.
2049 
2050         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2051             super(a, b);
2052         }
2053 
2054         @SuppressWarnings("overloads")
2055         static AWTEventListener add(AWTEventListener a,
2056                                     AWTEventListener b) {
2057             if (a == null)  return b;
2058             if (b == null)  return a;
2059             return new ToolkitEventMulticaster(a, b);
2060         }
2061 
2062         @SuppressWarnings("overloads")
2063         static AWTEventListener remove(AWTEventListener l,
2064                                        AWTEventListener oldl) {
2065             return (AWTEventListener) removeInternal(l, oldl);
2066         }
2067 
2068         // #4178589: must overload remove(EventListener) to call our add()
2069         // instead of the static addInternal() so we allocate a
2070         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2071         // Note: this method is called by AWTEventListener.removeInternal(),
2072         // so its method signature must match AWTEventListener.remove().
2073         protected EventListener remove(EventListener oldl) {
2074             if (oldl == a)  return b;
2075             if (oldl == b)  return a;
2076             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2077             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2078             if (a2 == a && b2 == b) {
2079                 return this;    // it's not here
2080             }
2081             return add(a2, b2);
2082         }
2083 
2084         public void eventDispatched(AWTEvent event) {
2085             ((AWTEventListener)a).eventDispatched(event);
2086             ((AWTEventListener)b).eventDispatched(event);
2087         }
2088     }
2089 
2090     private class SelectiveAWTEventListener implements AWTEventListener {
2091         AWTEventListener listener;
2092         private long eventMask;
2093         // This array contains the number of times to call the eventlistener
2094         // for each event type.
2095         int[] calls = new int[Toolkit.LONG_BITS];
2096 
2097         public AWTEventListener getListener() {return listener;}
2098         public long getEventMask() {return eventMask;}
2099         public int[] getCalls() {return calls;}
2100 
2101         public void orEventMasks(long mask) {
2102             eventMask |= mask;
2103             // For each event bit set in mask, increment its call count.
2104             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2105                 // If no bits are set, break out of loop.
2106                 if (mask == 0) {
2107                     break;
2108                 }
2109                 if ((mask & 1L) != 0) {  // Always test bit 0.
2110                     calls[i]++;
2111                 }
2112                 mask >>>= 1;  // Right shift, fill with zeros on left.
2113             }
2114         }
2115 
2116         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2117             listener = l;
2118             eventMask = mask;
2119         }
2120 
2121         public void eventDispatched(AWTEvent event) {
2122             long eventBit = 0; // Used to save the bit of the event type.
2123             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2124                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2125                  event.id <= ComponentEvent.COMPONENT_LAST)
2126              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2127                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2128                  event.id <= ContainerEvent.CONTAINER_LAST)
2129              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2130                  event.id >= FocusEvent.FOCUS_FIRST &&
2131                  event.id <= FocusEvent.FOCUS_LAST)
2132              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2133                  event.id >= KeyEvent.KEY_FIRST &&
2134                  event.id <= KeyEvent.KEY_LAST)
2135              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2136                  event.id == MouseEvent.MOUSE_WHEEL)
2137              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2138                  (event.id == MouseEvent.MOUSE_MOVED ||
2139                   event.id == MouseEvent.MOUSE_DRAGGED))
2140              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2141                  event.id != MouseEvent.MOUSE_MOVED &&
2142                  event.id != MouseEvent.MOUSE_DRAGGED &&
2143                  event.id != MouseEvent.MOUSE_WHEEL &&
2144                  event.id >= MouseEvent.MOUSE_FIRST &&
2145                  event.id <= MouseEvent.MOUSE_LAST)
2146              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2147                  (event.id >= WindowEvent.WINDOW_FIRST &&
2148                  event.id <= WindowEvent.WINDOW_LAST))
2149              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2150                  event.id >= ActionEvent.ACTION_FIRST &&
2151                  event.id <= ActionEvent.ACTION_LAST)
2152              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2153                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2154                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2155              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2156                  event.id >= ItemEvent.ITEM_FIRST &&
2157                  event.id <= ItemEvent.ITEM_LAST)
2158              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2159                  event.id >= TextEvent.TEXT_FIRST &&
2160                  event.id <= TextEvent.TEXT_LAST)
2161              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2162                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2163                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2164              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2165                  event.id >= PaintEvent.PAINT_FIRST &&
2166                  event.id <= PaintEvent.PAINT_LAST)
2167              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2168                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2169                  event.id <= InvocationEvent.INVOCATION_LAST)
2170              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2171                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2172              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2173                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2174                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2175              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2176                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2177              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2178                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2179                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2180                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2181                     (event instanceof sun.awt.UngrabEvent))) {
2182                 // Get the index of the call count for this event type.
2183                 // Instead of using Math.log(...) we will calculate it with
2184                 // bit shifts. That's what previous implementation looked like:
2185                 //
2186                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2187                 int ci = 0;
2188                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2189                 }
2190                 ci--;
2191                 // Call the listener as many times as it was added for this
2192                 // event type.
2193                 for (int i=0; i<calls[ci]; i++) {
2194                     listener.eventDispatched(event);
2195                 }
2196             }
2197         }
2198     }
2199 
2200     /**
2201      * Returns a map of visual attributes for the abstract level description
2202      * of the given input method highlight, or null if no mapping is found.
2203      * The style field of the input method highlight is ignored. The map
2204      * returned is unmodifiable.
2205      * @param highlight input method highlight
2206      * @return style attribute map, or {@code null}
2207      * @exception HeadlessException if
2208      *     {@code GraphicsEnvironment.isHeadless} returns true
2209      * @see       java.awt.GraphicsEnvironment#isHeadless
2210      * @since 1.3
2211      */
2212     public abstract Map<java.awt.font.TextAttribute,?>
2213         mapInputMethodHighlight(InputMethodHighlight highlight)
2214         throws HeadlessException;
2215 
2216     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2217         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2218             return new DesktopPropertyChangeSupport(toolkit);
2219         } else {
2220             return new PropertyChangeSupport(toolkit);
2221         }
2222     }
2223 
2224     @SuppressWarnings("serial")
2225     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2226 
2227         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2228                 new StringBuilder("desktop property change support key");
2229         private final Object source;
2230 
2231         public DesktopPropertyChangeSupport(Object sourceBean) {
2232             super(sourceBean);
2233             source = sourceBean;
2234         }
2235 
2236         @Override
2237         public synchronized void addPropertyChangeListener(
2238                 String propertyName,
2239                 PropertyChangeListener listener)
2240         {
2241             PropertyChangeSupport pcs = (PropertyChangeSupport)
2242                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2243             if (null == pcs) {
2244                 pcs = new PropertyChangeSupport(source);
2245                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2246             }
2247             pcs.addPropertyChangeListener(propertyName, listener);
2248         }
2249 
2250         @Override
2251         public synchronized void removePropertyChangeListener(
2252                 String propertyName,
2253                 PropertyChangeListener listener)
2254         {
2255             PropertyChangeSupport pcs = (PropertyChangeSupport)
2256                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2257             if (null != pcs) {
2258                 pcs.removePropertyChangeListener(propertyName, listener);
2259             }
2260         }
2261 
2262         @Override
2263         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2264         {
2265             PropertyChangeSupport pcs = (PropertyChangeSupport)
2266                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2267             if (null != pcs) {
2268                 return pcs.getPropertyChangeListeners();
2269             } else {
2270                 return new PropertyChangeListener[0];
2271             }
2272         }
2273 
2274         @Override
2275         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2276         {
2277             PropertyChangeSupport pcs = (PropertyChangeSupport)
2278                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2279             if (null != pcs) {
2280                 return pcs.getPropertyChangeListeners(propertyName);
2281             } else {
2282                 return new PropertyChangeListener[0];
2283             }
2284         }
2285 
2286         @Override
2287         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2288             PropertyChangeSupport pcs = (PropertyChangeSupport)
2289                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2290             if (null == pcs) {
2291                 pcs = new PropertyChangeSupport(source);
2292                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2293             }
2294             pcs.addPropertyChangeListener(listener);
2295         }
2296 
2297         @Override
2298         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2299             PropertyChangeSupport pcs = (PropertyChangeSupport)
2300                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2301             if (null != pcs) {
2302                 pcs.removePropertyChangeListener(listener);
2303             }
2304         }
2305 
2306         /*
2307          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2308          * use this method.  If this will be changed we will need to change this class.
2309          */
2310         @Override
2311         public void firePropertyChange(final PropertyChangeEvent evt) {
2312             Object oldValue = evt.getOldValue();
2313             Object newValue = evt.getNewValue();
2314             String propertyName = evt.getPropertyName();
2315             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2316                 return;
2317             }
2318             Runnable updater = new Runnable() {
2319                 public void run() {
2320                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2321                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2322                     if (null != pcs) {
2323                         pcs.firePropertyChange(evt);
2324                     }
2325                 }
2326             };
2327             final AppContext currentAppContext = AppContext.getAppContext();
2328             for (AppContext appContext : AppContext.getAppContexts()) {
2329                 if (null == appContext || appContext.isDisposed()) {
2330                     continue;
2331                 }
2332                 if (currentAppContext == appContext) {
2333                     updater.run();
2334                 } else {
2335                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2336                     SunToolkit.postEvent(appContext, e);
2337                 }
2338             }
2339         }
2340     }
2341 
2342     /**
2343     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2344     * {@code EventQueue}.
2345     * <br>
2346     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2347     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2348     * startup by the following command:
2349     * <pre>
2350     * java -Dsun.awt.enableExtraMouseButtons=false Application
2351     * </pre>
2352     * Alternatively, the property could be set in the application by using the following code:
2353     * <pre>
2354     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2355     * </pre>
2356     * before the {@code Toolkit} class initialization.
2357     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2358     * initialized with {@code true}.
2359     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2360     *
2361     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2362     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2363     *         {@code false} otherwise
2364     * @see System#getProperty(String propertyName)
2365     * @see System#setProperty(String propertyName, String value)
2366     * @see java.awt.EventQueue
2367     * @since 1.7
2368      */
2369     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2370         GraphicsEnvironment.checkHeadless();
2371 
2372         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2373     }
2374 }
--- EOF ---