1 /*
   2  * Copyright (c) 1995, 2019, 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.  If the list of assistive technology providers is the
 507      * empty string or contains only white space characters or null then the method
 508      * returns immediately. All other errors are handled via an AWTError exception.
 509      */
 510     private static void loadAssistiveTechnologies() {
 511         // Load any assistive technologies
 512         if (atNames != null && !atNames.strip().isEmpty()) {
 513             ClassLoader cl = ClassLoader.getSystemClassLoader();
 514             Set<String> names = Arrays.stream(atNames.split(","))
 515                                         .map(String::trim)
 516                                         .collect(Collectors.toSet());
 517             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 518             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 519                 try {
 520                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 521                         String name = p.getName();
 522                         if (names.contains(name) && !providers.containsKey(name)) {
 523                             p.activate();
 524                             providers.put(name, p);
 525                         }
 526                     }
 527                 } catch (java.util.ServiceConfigurationError | Exception e) {
 528                     newAWTError(e, "Could not load or activate service provider");
 529                 }
 530                 return null;
 531             });
 532             names.stream()
 533                     .filter(n -> !providers.containsKey(n))
 534                     .forEach(Toolkit::fallbackToLoadClassForAT);
 535         }
 536     }
 537 
 538     /**
 539      * Gets the default toolkit.
 540      * <p>
 541      * If a system property named {@code "java.awt.headless"} is set
 542      * to {@code true} then the headless implementation
 543      * of {@code Toolkit} is used,
 544      * otherwise the default platform-specific implementation of
 545      * {@code Toolkit} is used.
 546      * <p>
 547      * If this Toolkit is not a headless implementation and if they exist, service
 548      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 549      * if specified by the system property
 550      * {@code javax.accessibility.assistive_technologies}.
 551      * <p>
 552      * An example of setting this property is to invoke Java with
 553      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 554      * In addition to MyServiceProvider other service providers can be specified
 555      * using a comma separated list.  Service providers are loaded after the AWT
 556      * toolkit is created.
 557      * If the list of assistive technology providers as provided through system property
 558      * "{@systemProperty javax.accessibility.assistive_technologies}" is the empty string or
 559      * contains only white space characters then the method returns immediately.
 560      * All other errors are handled via an AWTError exception.
 561      * <p>
 562      * The names specified in the assistive_technologies property are used to query
 563      * each service provider implementation.  If the requested name matches the
 564      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 565      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 566      * matching service provider.
 567      *
 568      * @implSpec
 569      * If assistive technology service providers are not specified with a system
 570      * property this implementation will look in a properties file located as follows:
 571      * <ul>
 572      * <li> {@code ${user.home}/.accessibility.properties}
 573      * <li> {@code ${java.home}/conf/accessibility.properties}
 574      * </ul>
 575      * Only the first of these files to be located will be consulted.  The requested
 576      * service providers are specified by setting the {@code assistive_technologies=}
 577      * property.  A single provider or a comma separated list of providers can be
 578      * specified.
 579      *
 580      * @return     the default toolkit.
 581      * @exception  AWTError  if a toolkit could not be found, or
 582      *                 if one could not be accessed or instantiated.
 583      * @see java.util.ServiceLoader
 584      * @see javax.accessibility.AccessibilityProvider
 585      */
 586     public static synchronized Toolkit getDefaultToolkit() {
 587         if (toolkit == null) {
 588             java.security.AccessController.doPrivileged(
 589                     new java.security.PrivilegedAction<Void>() {
 590                 public Void run() {
 591                     Class<?> cls = null;
 592                     String nm = System.getProperty("awt.toolkit");
 593                     try {
 594                         cls = Class.forName(nm);
 595                     } catch (ClassNotFoundException e) {
 596                         ClassLoader cl = ClassLoader.getSystemClassLoader();
 597                         if (cl != null) {
 598                             try {
 599                                 cls = cl.loadClass(nm);
 600                             } catch (final ClassNotFoundException ignored) {
 601                                 throw new AWTError("Toolkit not found: " + nm);
 602                             }
 603                         }
 604                     }
 605                     try {
 606                         if (cls != null) {
 607                             toolkit = (Toolkit)cls.getConstructor().newInstance();
 608                             if (GraphicsEnvironment.isHeadless()) {
 609                                 toolkit = new HeadlessToolkit(toolkit);
 610                             }
 611                         }
 612                     } catch (final ReflectiveOperationException ignored) {
 613                         throw new AWTError("Could not create Toolkit: " + nm);
 614                     }
 615                     return null;
 616                 }
 617             });
 618             if (!GraphicsEnvironment.isHeadless()) {
 619                 loadAssistiveTechnologies();
 620             }
 621         }
 622         return toolkit;
 623     }
 624 
 625     /**
 626      * Returns an image which gets pixel data from the specified file,
 627      * whose format can be either GIF, JPEG or PNG.
 628      * The underlying toolkit attempts to resolve multiple requests
 629      * with the same filename to the same returned Image.
 630      * <p>
 631      * Since the mechanism required to facilitate this sharing of
 632      * {@code Image} objects may continue to hold onto images
 633      * that are no longer in use for an indefinite period of time,
 634      * developers are encouraged to implement their own caching of
 635      * images by using the {@link #createImage(java.lang.String) createImage}
 636      * variant wherever available.
 637      * If the image data contained in the specified file changes,
 638      * the {@code Image} object returned from this method may
 639      * still contain stale information which was loaded from the
 640      * file after a prior call.
 641      * Previously loaded image data can be manually discarded by
 642      * calling the {@link Image#flush flush} method on the
 643      * returned {@code Image}.
 644      * <p>
 645      * This method first checks if there is a security manager installed.
 646      * If so, the method calls the security manager's
 647      * {@code checkRead} method with the file specified to ensure
 648      * that the access to the image is allowed.
 649      * @param     filename   the name of a file containing pixel data
 650      *                         in a recognized file format.
 651      * @return    an image which gets its pixel data from
 652      *                         the specified file.
 653      * @throws SecurityException  if a security manager exists and its
 654      *                            checkRead method doesn't allow the operation.
 655      * @see #createImage(java.lang.String)
 656      */
 657     public abstract Image getImage(String filename);
 658 
 659     /**
 660      * Returns an image which gets pixel data from the specified URL.
 661      * The pixel data referenced by the specified URL must be in one
 662      * of the following formats: GIF, JPEG or PNG.
 663      * The underlying toolkit attempts to resolve multiple requests
 664      * with the same URL to the same returned Image.
 665      * <p>
 666      * Since the mechanism required to facilitate this sharing of
 667      * {@code Image} objects may continue to hold onto images
 668      * that are no longer in use for an indefinite period of time,
 669      * developers are encouraged to implement their own caching of
 670      * images by using the {@link #createImage(java.net.URL) createImage}
 671      * variant wherever available.
 672      * If the image data stored at the specified URL changes,
 673      * the {@code Image} object returned from this method may
 674      * still contain stale information which was fetched from the
 675      * URL after a prior call.
 676      * Previously loaded image data can be manually discarded by
 677      * calling the {@link Image#flush flush} method on the
 678      * returned {@code Image}.
 679      * <p>
 680      * This method first checks if there is a security manager installed.
 681      * If so, the method calls the security manager's
 682      * {@code checkPermission} method with the corresponding
 683      * permission to ensure that the access to the image is allowed.
 684      * If the connection to the specified URL requires
 685      * either {@code URLPermission} or {@code SocketPermission},
 686      * then {@code URLPermission} is used for security checks.
 687      * @param     url   the URL to use in fetching the pixel data.
 688      * @return    an image which gets its pixel data from
 689      *                         the specified URL.
 690      * @throws SecurityException  if a security manager exists and its
 691      *                            checkPermission method doesn't allow
 692      *                            the operation.
 693      * @see #createImage(java.net.URL)
 694      */
 695     public abstract Image getImage(URL url);
 696 
 697     /**
 698      * Returns an image which gets pixel data from the specified file.
 699      * The returned Image is a new object which will not be shared
 700      * with any other caller of this method or its getImage variant.
 701      * <p>
 702      * This method first checks if there is a security manager installed.
 703      * If so, the method calls the security manager's
 704      * {@code checkRead} method with the specified file to ensure
 705      * that the image creation is allowed.
 706      * @param     filename   the name of a file containing pixel data
 707      *                         in a recognized file format.
 708      * @return    an image which gets its pixel data from
 709      *                         the specified file.
 710      * @throws SecurityException  if a security manager exists and its
 711      *                            checkRead method doesn't allow the operation.
 712      * @see #getImage(java.lang.String)
 713      */
 714     public abstract Image createImage(String filename);
 715 
 716     /**
 717      * Returns an image which gets pixel data from the specified URL.
 718      * The returned Image is a new object which will not be shared
 719      * with any other caller of this method or its getImage variant.
 720      * <p>
 721      * This method first checks if there is a security manager installed.
 722      * If so, the method calls the security manager's
 723      * {@code checkPermission} method with the corresponding
 724      * permission to ensure that the image creation is allowed.
 725      * If the connection to the specified URL requires
 726      * either {@code URLPermission} or {@code SocketPermission},
 727      * then {@code URLPermission} is used for security checks.
 728      * @param     url   the URL to use in fetching the pixel data.
 729      * @return    an image which gets its pixel data from
 730      *                         the specified URL.
 731      * @throws SecurityException  if a security manager exists and its
 732      *                            checkPermission method doesn't allow
 733      *                            the operation.
 734      * @see #getImage(java.net.URL)
 735      */
 736     public abstract Image createImage(URL url);
 737 
 738     /**
 739      * Prepares an image for rendering.
 740      * <p>
 741      * If the values of the width and height arguments are both
 742      * {@code -1}, this method prepares the image for rendering
 743      * on the default screen; otherwise, this method prepares an image
 744      * for rendering on the default screen at the specified width and height.
 745      * <p>
 746      * The image data is downloaded asynchronously in another thread,
 747      * and an appropriately scaled screen representation of the image is
 748      * generated.
 749      * <p>
 750      * This method is called by components {@code prepareImage}
 751      * methods.
 752      * <p>
 753      * Information on the flags returned by this method can be found
 754      * with the definition of the {@code ImageObserver} interface.
 755 
 756      * @param     image      the image for which to prepare a
 757      *                           screen representation.
 758      * @param     width      the width of the desired screen
 759      *                           representation, or {@code -1}.
 760      * @param     height     the height of the desired screen
 761      *                           representation, or {@code -1}.
 762      * @param     observer   the {@code ImageObserver}
 763      *                           object to be notified as the
 764      *                           image is being prepared.
 765      * @return    {@code true} if the image has already been
 766      *                 fully prepared; {@code false} otherwise.
 767      * @see       java.awt.Component#prepareImage(java.awt.Image,
 768      *                 java.awt.image.ImageObserver)
 769      * @see       java.awt.Component#prepareImage(java.awt.Image,
 770      *                 int, int, java.awt.image.ImageObserver)
 771      * @see       java.awt.image.ImageObserver
 772      */
 773     public abstract boolean prepareImage(Image image, int width, int height,
 774                                          ImageObserver observer);
 775 
 776     /**
 777      * Indicates the construction status of a specified image that is
 778      * being prepared for display.
 779      * <p>
 780      * If the values of the width and height arguments are both
 781      * {@code -1}, this method returns the construction status of
 782      * a screen representation of the specified image in this toolkit.
 783      * Otherwise, this method returns the construction status of a
 784      * scaled representation of the image at the specified width
 785      * and height.
 786      * <p>
 787      * This method does not cause the image to begin loading.
 788      * An application must call {@code prepareImage} to force
 789      * the loading of an image.
 790      * <p>
 791      * This method is called by the component's {@code checkImage}
 792      * methods.
 793      * <p>
 794      * Information on the flags returned by this method can be found
 795      * with the definition of the {@code ImageObserver} interface.
 796      * @param     image   the image whose status is being checked.
 797      * @param     width   the width of the scaled version whose status is
 798      *                 being checked, or {@code -1}.
 799      * @param     height  the height of the scaled version whose status
 800      *                 is being checked, or {@code -1}.
 801      * @param     observer   the {@code ImageObserver} object to be
 802      *                 notified as the image is being prepared.
 803      * @return    the bitwise inclusive <strong>OR</strong> of the
 804      *                 {@code ImageObserver} flags for the
 805      *                 image data that is currently available.
 806      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 807      *                 int, int, java.awt.image.ImageObserver)
 808      * @see       java.awt.Component#checkImage(java.awt.Image,
 809      *                 java.awt.image.ImageObserver)
 810      * @see       java.awt.Component#checkImage(java.awt.Image,
 811      *                 int, int, java.awt.image.ImageObserver)
 812      * @see       java.awt.image.ImageObserver
 813      */
 814     public abstract int checkImage(Image image, int width, int height,
 815                                    ImageObserver observer);
 816 
 817     /**
 818      * Creates an image with the specified image producer.
 819      * @param     producer the image producer to be used.
 820      * @return    an image with the specified image producer.
 821      * @see       java.awt.Image
 822      * @see       java.awt.image.ImageProducer
 823      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 824      */
 825     public abstract Image createImage(ImageProducer producer);
 826 
 827     /**
 828      * Creates an image which decodes the image stored in the specified
 829      * byte array.
 830      * <p>
 831      * The data must be in some image format, such as GIF or JPEG,
 832      * that is supported by this toolkit.
 833      * @param     imagedata   an array of bytes, representing
 834      *                         image data in a supported image format.
 835      * @return    an image.
 836      * @since     1.1
 837      */
 838     public Image createImage(byte[] imagedata) {
 839         return createImage(imagedata, 0, imagedata.length);
 840     }
 841 
 842     /**
 843      * Creates an image which decodes the image stored in the specified
 844      * byte array, and at the specified offset and length.
 845      * The data must be in some image format, such as GIF or JPEG,
 846      * that is supported by this toolkit.
 847      * @param     imagedata   an array of bytes, representing
 848      *                         image data in a supported image format.
 849      * @param     imageoffset  the offset of the beginning
 850      *                         of the data in the array.
 851      * @param     imagelength  the length of the data in the array.
 852      * @return    an image.
 853      * @since     1.1
 854      */
 855     public abstract Image createImage(byte[] imagedata,
 856                                       int imageoffset,
 857                                       int imagelength);
 858 
 859     /**
 860      * Gets a {@code PrintJob} object which is the result of initiating
 861      * a print operation on the toolkit's platform.
 862      * <p>
 863      * Each actual implementation of this method should first check if there
 864      * is a security manager installed. If there is, the method should call
 865      * the security manager's {@code checkPrintJobAccess} method to
 866      * ensure initiation of a print operation is allowed. If the default
 867      * implementation of {@code checkPrintJobAccess} is used (that is,
 868      * that method is not overriden), then this results in a call to the
 869      * security manager's {@code checkPermission} method with a
 870      * {@code RuntimePermission("queuePrintJob")} permission.
 871      *
 872      * @param   frame the parent of the print dialog. May not be null.
 873      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 874      *          to "".
 875      * @param   props a Properties object containing zero or more properties.
 876      *          Properties are not standardized and are not consistent across
 877      *          implementations. Because of this, PrintJobs which require job
 878      *          and page control should use the version of this function which
 879      *          takes JobAttributes and PageAttributes objects. This object
 880      *          may be updated to reflect the user's job choices on exit. May
 881      *          be null.
 882      * @return  a {@code PrintJob} object, or {@code null} if the
 883      *          user cancelled the print job.
 884      * @throws  NullPointerException if frame is null
 885      * @throws  SecurityException if this thread is not allowed to initiate a
 886      *          print job request
 887      * @see     java.awt.GraphicsEnvironment#isHeadless
 888      * @see     java.awt.PrintJob
 889      * @see     java.lang.RuntimePermission
 890      * @since   1.1
 891      */
 892     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 893                                          Properties props);
 894 
 895     /**
 896      * Gets a {@code PrintJob} object which is the result of initiating
 897      * a print operation on the toolkit's platform.
 898      * <p>
 899      * Each actual implementation of this method should first check if there
 900      * is a security manager installed. If there is, the method should call
 901      * the security manager's {@code checkPrintJobAccess} method to
 902      * ensure initiation of a print operation is allowed. If the default
 903      * implementation of {@code checkPrintJobAccess} is used (that is,
 904      * that method is not overriden), then this results in a call to the
 905      * security manager's {@code checkPermission} method with a
 906      * {@code RuntimePermission("queuePrintJob")} permission.
 907      *
 908      * @param   frame the parent of the print dialog. May not be null.
 909      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 910      *          to "".
 911      * @param   jobAttributes a set of job attributes which will control the
 912      *          PrintJob. The attributes will be updated to reflect the user's
 913      *          choices as outlined in the JobAttributes documentation. May be
 914      *          null.
 915      * @param   pageAttributes a set of page attributes which will control the
 916      *          PrintJob. The attributes will be applied to every page in the
 917      *          job. The attributes will be updated to reflect the user's
 918      *          choices as outlined in the PageAttributes documentation. May be
 919      *          null.
 920      * @return  a {@code PrintJob} object, or {@code null} if the
 921      *          user cancelled the print job.
 922      * @throws  NullPointerException if frame is null
 923      * @throws  IllegalArgumentException if pageAttributes specifies differing
 924      *          cross feed and feed resolutions. Also if this thread has
 925      *          access to the file system and jobAttributes specifies
 926      *          print to file, and the specified destination file exists but
 927      *          is a directory rather than a regular file, does not exist but
 928      *          cannot be created, or cannot be opened for any other reason.
 929      *          However in the case of print to file, if a dialog is also
 930      *          requested to be displayed then the user will be given an
 931      *          opportunity to select a file and proceed with printing.
 932      *          The dialog will ensure that the selected output file
 933      *          is valid before returning from this method.
 934      * @throws  SecurityException if this thread is not allowed to initiate a
 935      *          print job request, or if jobAttributes specifies print to file,
 936      *          and this thread is not allowed to access the file system
 937      * @see     java.awt.PrintJob
 938      * @see     java.awt.GraphicsEnvironment#isHeadless
 939      * @see     java.lang.RuntimePermission
 940      * @see     java.awt.JobAttributes
 941      * @see     java.awt.PageAttributes
 942      * @since   1.3
 943      */
 944     public PrintJob getPrintJob(Frame frame, String jobtitle,
 945                                 JobAttributes jobAttributes,
 946                                 PageAttributes pageAttributes) {
 947         // Override to add printing support with new job/page control classes
 948 
 949         if (this != Toolkit.getDefaultToolkit()) {
 950             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 951                                                            jobAttributes,
 952                                                            pageAttributes);
 953         } else {
 954             return getPrintJob(frame, jobtitle, null);
 955         }
 956     }
 957 
 958     /**
 959      * Emits an audio beep depending on native system settings and hardware
 960      * capabilities.
 961      * @since     1.1
 962      */
 963     public abstract void beep();
 964 
 965     /**
 966      * Gets the singleton instance of the system Clipboard which interfaces
 967      * with clipboard facilities provided by the native platform. This
 968      * clipboard enables data transfer between Java programs and native
 969      * applications which use native clipboard facilities.
 970      * <p>
 971      * In addition to any and all default formats text returned by the system
 972      * Clipboard's {@code getTransferData()} method is available in the
 973      * following flavors:
 974      * <ul>
 975      * <li>DataFlavor.stringFlavor</li>
 976      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 977      * </ul>
 978      * As with {@code java.awt.datatransfer.StringSelection}, if the
 979      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 980      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 981      * the system Clipboard's {@code getTransferData()} method for
 982      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 983      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 984      * Because of this, support for
 985      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 986      * <b>deprecated</b>.
 987      * <p>
 988      * Each actual implementation of this method should first check if there
 989      * is a security manager installed. If there is, the method should call
 990      * the security manager's {@link SecurityManager#checkPermission
 991      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 992      *
 993      * @return    the system Clipboard
 994      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 995      * returns true
 996      * @see       java.awt.GraphicsEnvironment#isHeadless
 997      * @see       java.awt.datatransfer.Clipboard
 998      * @see       java.awt.datatransfer.StringSelection
 999      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
1000      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
1001      * @see       java.io.Reader
1002      * @see       java.awt.AWTPermission
1003      * @since     1.1
1004      */
1005     public abstract Clipboard getSystemClipboard()
1006         throws HeadlessException;
1007 
1008     /**
1009      * Gets the singleton instance of the system selection as a
1010      * {@code Clipboard} object. This allows an application to read and
1011      * modify the current, system-wide selection.
1012      * <p>
1013      * An application is responsible for updating the system selection whenever
1014      * the user selects text, using either the mouse or the keyboard.
1015      * Typically, this is implemented by installing a
1016      * {@code FocusListener} on all {@code Component}s which support
1017      * text selection, and, between {@code FOCUS_GAINED} and
1018      * {@code FOCUS_LOST} events delivered to that {@code Component},
1019      * updating the system selection {@code Clipboard} when the selection
1020      * changes inside the {@code Component}. Properly updating the system
1021      * selection ensures that a Java application will interact correctly with
1022      * native applications and other Java applications running simultaneously
1023      * on the system. Note that {@code java.awt.TextComponent} and
1024      * {@code javax.swing.text.JTextComponent} already adhere to this
1025      * policy. When using these classes, and their subclasses, developers need
1026      * not write any additional code.
1027      * <p>
1028      * Some platforms do not support a system selection {@code Clipboard}.
1029      * On those platforms, this method will return {@code null}. In such a
1030      * case, an application is absolved from its responsibility to update the
1031      * system selection {@code Clipboard} as described above.
1032      * <p>
1033      * Each actual implementation of this method should first check if there
1034      * is a security manager installed. If there is, the method should call
1035      * the security manager's {@link SecurityManager#checkPermission
1036      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1037      *
1038      * @return the system selection as a {@code Clipboard}, or
1039      *         {@code null} if the native platform does not support a
1040      *         system selection {@code Clipboard}
1041      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1042      *            returns true
1043      *
1044      * @see java.awt.datatransfer.Clipboard
1045      * @see java.awt.event.FocusListener
1046      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1047      * @see java.awt.event.FocusEvent#FOCUS_LOST
1048      * @see TextComponent
1049      * @see javax.swing.text.JTextComponent
1050      * @see AWTPermission
1051      * @see GraphicsEnvironment#isHeadless
1052      * @since 1.4
1053      */
1054     public Clipboard getSystemSelection() throws HeadlessException {
1055         GraphicsEnvironment.checkHeadless();
1056 
1057         if (this != Toolkit.getDefaultToolkit()) {
1058             return Toolkit.getDefaultToolkit().getSystemSelection();
1059         } else {
1060             GraphicsEnvironment.checkHeadless();
1061             return null;
1062         }
1063     }
1064 
1065     /**
1066      * Determines which modifier key is the appropriate accelerator
1067      * key for menu shortcuts.
1068      * <p>
1069      * Menu shortcuts, which are embodied in the
1070      * {@code MenuShortcut} class, are handled by the
1071      * {@code MenuBar} class.
1072      * <p>
1073      * By default, this method returns {@code Event.CTRL_MASK}.
1074      * Toolkit implementations should override this method if the
1075      * <b>Control</b> key isn't the correct key for accelerators.
1076      * @return    the modifier mask on the {@code Event} class
1077      *                 that is used for menu shortcuts on this toolkit.
1078      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1079      * returns true
1080      * @see       java.awt.GraphicsEnvironment#isHeadless
1081      * @see       java.awt.MenuBar
1082      * @see       java.awt.MenuShortcut
1083      * @deprecated It is recommended that extended modifier keys and
1084      *             {@link #getMenuShortcutKeyMaskEx()} be used instead
1085      * @since     1.1
1086      */
1087     @Deprecated(since = "10")
1088     public int getMenuShortcutKeyMask() throws HeadlessException {
1089         GraphicsEnvironment.checkHeadless();
1090 
1091         return Event.CTRL_MASK;
1092     }
1093 
1094     /**
1095      * Determines which extended modifier key is the appropriate accelerator
1096      * key for menu shortcuts.
1097      * <p>
1098      * Menu shortcuts, which are embodied in the {@code MenuShortcut} class, are
1099      * handled by the {@code MenuBar} class.
1100      * <p>
1101      * By default, this method returns {@code InputEvent.CTRL_DOWN_MASK}.
1102      * Toolkit implementations should override this method if the
1103      * <b>Control</b> key isn't the correct key for accelerators.
1104      *
1105      * @return the modifier mask on the {@code InputEvent} class that is used
1106      *         for menu shortcuts on this toolkit
1107      * @throws HeadlessException if GraphicsEnvironment.isHeadless() returns
1108      *         true
1109      * @see java.awt.GraphicsEnvironment#isHeadless
1110      * @see java.awt.MenuBar
1111      * @see java.awt.MenuShortcut
1112      * @since 10
1113      */
1114     public int getMenuShortcutKeyMaskEx() throws HeadlessException {
1115         GraphicsEnvironment.checkHeadless();
1116 
1117         return InputEvent.CTRL_DOWN_MASK;
1118     }
1119 
1120     /**
1121      * Returns whether the given locking key on the keyboard is currently in
1122      * its "on" state.
1123      * Valid key codes are
1124      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1125      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1126      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1127      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1128      *
1129      * @param  keyCode the key code
1130      * @return {@code true} if the given key is currently in its "on" state;
1131      *          otherwise {@code false}
1132      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1133      * is not one of the valid key codes
1134      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1135      * allow getting the state of this key programmatically, or if the keyboard
1136      * doesn't have this key
1137      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1138      * returns true
1139      * @see       java.awt.GraphicsEnvironment#isHeadless
1140      * @since 1.3
1141      */
1142     public boolean getLockingKeyState(int keyCode)
1143         throws UnsupportedOperationException
1144     {
1145         GraphicsEnvironment.checkHeadless();
1146 
1147         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1148                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1149             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1150         }
1151         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1152     }
1153 
1154     /**
1155      * Sets the state of the given locking key on the keyboard.
1156      * Valid key codes are
1157      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1158      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1159      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1160      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1161      * <p>
1162      * Depending on the platform, setting the state of a locking key may
1163      * involve event processing and therefore may not be immediately
1164      * observable through getLockingKeyState.
1165      *
1166      * @param  keyCode the key code
1167      * @param  on the state of the key
1168      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1169      * is not one of the valid key codes
1170      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1171      * allow setting the state of this key programmatically, or if the keyboard
1172      * doesn't have this key
1173      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1174      * returns true
1175      * @see       java.awt.GraphicsEnvironment#isHeadless
1176      * @since 1.3
1177      */
1178     public void setLockingKeyState(int keyCode, boolean on)
1179         throws UnsupportedOperationException
1180     {
1181         GraphicsEnvironment.checkHeadless();
1182 
1183         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1184                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1185             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1186         }
1187         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1188     }
1189 
1190     /**
1191      * Give native peers the ability to query the native container
1192      * given a native component (eg the direct parent may be lightweight).
1193      *
1194      * @param  c the component to fetch the container for
1195      * @return the native container object for the component
1196      */
1197     protected static Container getNativeContainer(Component c) {
1198         return c.getNativeContainer();
1199     }
1200 
1201     /**
1202      * Creates a new custom cursor object.
1203      * If the image to display is invalid, the cursor will be hidden (made
1204      * completely transparent), and the hotspot will be set to (0, 0).
1205      *
1206      * <p>Note that multi-frame images are invalid and may cause this
1207      * method to hang.
1208      *
1209      * @param cursor the image to display when the cursor is activated
1210      * @param hotSpot the X and Y of the large cursor's hot spot; the
1211      *   hotSpot values must be less than the Dimension returned by
1212      *   {@code getBestCursorSize}
1213      * @param     name a localized description of the cursor, for Java Accessibility use
1214      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1215      *   the bounds of the cursor
1216      * @return the cursor created
1217      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1218      * returns true
1219      * @see       java.awt.GraphicsEnvironment#isHeadless
1220      * @since     1.2
1221      */
1222     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1223         throws IndexOutOfBoundsException, HeadlessException
1224     {
1225         // Override to implement custom cursor support.
1226         if (this != Toolkit.getDefaultToolkit()) {
1227             return Toolkit.getDefaultToolkit().
1228                 createCustomCursor(cursor, hotSpot, name);
1229         } else {
1230             return new Cursor(Cursor.DEFAULT_CURSOR);
1231         }
1232     }
1233 
1234     /**
1235      * Returns the supported cursor dimension which is closest to the desired
1236      * sizes.  Systems which only support a single cursor size will return that
1237      * size regardless of the desired sizes.  Systems which don't support custom
1238      * cursors will return a dimension of 0, 0. <p>
1239      * Note:  if an image is used whose dimensions don't match a supported size
1240      * (as returned by this method), the Toolkit implementation will attempt to
1241      * resize the image to a supported size.
1242      * Since converting low-resolution images is difficult,
1243      * no guarantees are made as to the quality of a cursor image which isn't a
1244      * supported size.  It is therefore recommended that this method
1245      * be called and an appropriate image used so no image conversion is made.
1246      *
1247      * @param     preferredWidth the preferred cursor width the component would like
1248      * to use.
1249      * @param     preferredHeight the preferred cursor height the component would like
1250      * to use.
1251      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1252      * the Toolkit implementation doesn't support custom cursors.
1253      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1254      * returns true
1255      * @see       java.awt.GraphicsEnvironment#isHeadless
1256      * @since     1.2
1257      */
1258     public Dimension getBestCursorSize(int preferredWidth,
1259         int preferredHeight) throws HeadlessException {
1260         GraphicsEnvironment.checkHeadless();
1261 
1262         // Override to implement custom cursor support.
1263         if (this != Toolkit.getDefaultToolkit()) {
1264             return Toolkit.getDefaultToolkit().
1265                 getBestCursorSize(preferredWidth, preferredHeight);
1266         } else {
1267             return new Dimension(0, 0);
1268         }
1269     }
1270 
1271     /**
1272      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1273      * palette.<p>
1274      * Note: if an image is used which has more colors in its palette than
1275      * the supported maximum, the Toolkit implementation will attempt to flatten the
1276      * palette to the maximum.  Since converting low-resolution images is difficult,
1277      * no guarantees are made as to the quality of a cursor image which has more
1278      * colors than the system supports.  It is therefore recommended that this method
1279      * be called and an appropriate image used so no image conversion is made.
1280      *
1281      * @return    the maximum number of colors, or zero if custom cursors are not
1282      * supported by this Toolkit implementation.
1283      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1284      * returns true
1285      * @see       java.awt.GraphicsEnvironment#isHeadless
1286      * @since     1.2
1287      */
1288     public int getMaximumCursorColors() throws HeadlessException {
1289         GraphicsEnvironment.checkHeadless();
1290 
1291         // Override to implement custom cursor support.
1292         if (this != Toolkit.getDefaultToolkit()) {
1293             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1294         } else {
1295             return 0;
1296         }
1297     }
1298 
1299     /**
1300      * Returns whether Toolkit supports this state for
1301      * {@code Frame}s.  This method tells whether the <em>UI
1302      * concept</em> of, say, maximization or iconification is
1303      * supported.  It will always return false for "compound" states
1304      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1305      * In other words, the rule of thumb is that only queries with a
1306      * single frame state constant as an argument are meaningful.
1307      * <p>Note that supporting a given concept is a platform-
1308      * dependent feature. Due to native limitations the Toolkit
1309      * object may report a particular state as supported, however at
1310      * the same time the Toolkit object will be unable to apply the
1311      * state to a given frame.  This circumstance has two following
1312      * consequences:
1313      * <ul>
1314      * <li>Only the return value of {@code false} for the present
1315      * method actually indicates that the given state is not
1316      * supported. If the method returns {@code true} the given state
1317      * may still be unsupported and/or unavailable for a particular
1318      * frame.
1319      * <li>The developer should consider examining the value of the
1320      * {@link java.awt.event.WindowEvent#getNewState} method of the
1321      * {@code WindowEvent} received through the {@link
1322      * java.awt.event.WindowStateListener}, rather than assuming
1323      * that the state given to the {@code setExtendedState()} method
1324      * will be definitely applied. For more information see the
1325      * documentation for the {@link Frame#setExtendedState} method.
1326      * </ul>
1327      *
1328      * @param state one of named frame state constants.
1329      * @return {@code true} is this frame state is supported by
1330      *     this Toolkit implementation, {@code false} otherwise.
1331      * @exception HeadlessException
1332      *     if {@code GraphicsEnvironment.isHeadless()}
1333      *     returns {@code true}.
1334      * @see java.awt.Window#addWindowStateListener
1335      * @since   1.4
1336      */
1337     public boolean isFrameStateSupported(int state)
1338         throws HeadlessException
1339     {
1340         GraphicsEnvironment.checkHeadless();
1341 
1342         if (this != Toolkit.getDefaultToolkit()) {
1343             return Toolkit.getDefaultToolkit().
1344                 isFrameStateSupported(state);
1345         } else {
1346             return (state == Frame.NORMAL); // others are not guaranteed
1347         }
1348     }
1349 
1350     /**
1351      * Support for I18N: any visible strings should be stored in
1352      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1353      * here, so that only one copy is maintained.
1354      */
1355     private static ResourceBundle resources;
1356     private static ResourceBundle platformResources;
1357 
1358     // called by platform toolkit
1359     private static void setPlatformResources(ResourceBundle bundle) {
1360         platformResources = bundle;
1361     }
1362 
1363     /**
1364      * Initialize JNI field and method ids
1365      */
1366     private static native void initIDs();
1367 
1368     /**
1369      * WARNING: This is a temporary workaround for a problem in the
1370      * way the AWT loads native libraries. A number of classes in the
1371      * AWT package have a native method, initIDs(), which initializes
1372      * the JNI field and method ids used in the native portion of
1373      * their implementation.
1374      *
1375      * Since the use and storage of these ids is done by the
1376      * implementation libraries, the implementation of these method is
1377      * provided by the particular AWT implementations (for example,
1378      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1379      * problem is that this means that the native libraries must be
1380      * loaded by the java.* classes, which do not necessarily know the
1381      * names of the libraries to load. A better way of doing this
1382      * would be to provide a separate library which defines java.awt.*
1383      * initIDs, and exports the relevant symbols out to the
1384      * implementation libraries.
1385      *
1386      * For now, we know it's done by the implementation, and we assume
1387      * that the name of the library is "awt".  -br.
1388      *
1389      * If you change loadLibraries(), please add the change to
1390      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1391      * classes can be loaded in java.awt.image that depend on
1392      * libawt and there is no way to call Toolkit.loadLibraries()
1393      * directly.  -hung
1394      */
1395     private static boolean loaded = false;
1396     static void loadLibraries() {
1397         if (!loaded) {
1398             java.security.AccessController.doPrivileged(
1399                 new java.security.PrivilegedAction<Void>() {
1400                     public Void run() {
1401                         System.loadLibrary("awt");
1402                         return null;
1403                     }
1404                 });
1405             loaded = true;
1406         }
1407     }
1408 
1409     static {
1410         AWTAccessor.setToolkitAccessor(
1411                 new AWTAccessor.ToolkitAccessor() {
1412                     @Override
1413                     public void setPlatformResources(ResourceBundle bundle) {
1414                         Toolkit.setPlatformResources(bundle);
1415                     }
1416                 });
1417 
1418         java.security.AccessController.doPrivileged(
1419                                  new java.security.PrivilegedAction<Void>() {
1420             public Void run() {
1421                 try {
1422                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1423                 } catch (MissingResourceException e) {
1424                     // No resource file; defaults will be used.
1425                 }
1426                 return null;
1427             }
1428         });
1429 
1430         // ensure that the proper libraries are loaded
1431         loadLibraries();
1432         initAssistiveTechnologies();
1433         initIDs();
1434     }
1435 
1436     /**
1437      * Gets a property with the specified key and default.
1438      * This method returns defaultValue if the property is not found.
1439      *
1440      * @param  key the key
1441      * @param  defaultValue the default value
1442      * @return the value of the property or the default value
1443      *         if the property was not found
1444      */
1445     public static String getProperty(String key, String defaultValue) {
1446         // first try platform specific bundle
1447         if (platformResources != null) {
1448             try {
1449                 return platformResources.getString(key);
1450             }
1451             catch (MissingResourceException e) {}
1452         }
1453 
1454         // then shared one
1455         if (resources != null) {
1456             try {
1457                 return resources.getString(key);
1458             }
1459             catch (MissingResourceException e) {}
1460         }
1461 
1462         return defaultValue;
1463     }
1464 
1465     /**
1466      * Get the application's or applet's EventQueue instance.
1467      * Depending on the Toolkit implementation, different EventQueues
1468      * may be returned for different applets.  Applets should
1469      * therefore not assume that the EventQueue instance returned
1470      * by this method will be shared by other applets or the system.
1471      *
1472      * <p> If there is a security manager then its
1473      * {@link SecurityManager#checkPermission checkPermission} method
1474      * is called to check {@code AWTPermission("accessEventQueue")}.
1475      *
1476      * @return    the {@code EventQueue} object
1477      * @throws  SecurityException
1478      *          if a security manager is set and it denies access to
1479      *          the {@code EventQueue}
1480      * @see     java.awt.AWTPermission
1481     */
1482     public final EventQueue getSystemEventQueue() {
1483         SecurityManager security = System.getSecurityManager();
1484         if (security != null) {
1485             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1486         }
1487         return getSystemEventQueueImpl();
1488     }
1489 
1490     /**
1491      * Gets the application's or applet's {@code EventQueue}
1492      * instance, without checking access.  For security reasons,
1493      * this can only be called from a {@code Toolkit} subclass.
1494      * @return the {@code EventQueue} object
1495      */
1496     protected abstract EventQueue getSystemEventQueueImpl();
1497 
1498     /* Accessor method for use by AWT package routines. */
1499     static EventQueue getEventQueue() {
1500         return getDefaultToolkit().getSystemEventQueueImpl();
1501     }
1502 
1503     /**
1504      * Creates a concrete, platform dependent, subclass of the abstract
1505      * DragGestureRecognizer class requested, and associates it with the
1506      * DragSource, Component and DragGestureListener specified.
1507      *
1508      * subclasses should override this to provide their own implementation
1509      *
1510      * @param <T> the type of DragGestureRecognizer to create
1511      * @param abstractRecognizerClass The abstract class of the required recognizer
1512      * @param ds                      The DragSource
1513      * @param c                       The Component target for the DragGestureRecognizer
1514      * @param srcActions              The actions permitted for the gesture
1515      * @param dgl                     The DragGestureListener
1516      *
1517      * @return the new object or null.  Always returns null if
1518      * GraphicsEnvironment.isHeadless() returns true.
1519      * @see java.awt.GraphicsEnvironment#isHeadless
1520      */
1521     public <T extends DragGestureRecognizer> T
1522         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1523                                     DragSource ds, Component c, int srcActions,
1524                                     DragGestureListener dgl)
1525     {
1526         return null;
1527     }
1528 
1529     /**
1530      * Obtains a value for the specified desktop property.
1531      *
1532      * A desktop property is a uniquely named value for a resource that
1533      * is Toolkit global in nature. Usually it also is an abstract
1534      * representation for an underlying platform dependent desktop setting.
1535      * For more information on desktop properties supported by the AWT see
1536      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1537      *
1538      * @param  propertyName the property name
1539      * @return the value for the specified desktop property
1540      */
1541     public final synchronized Object getDesktopProperty(String propertyName) {
1542         // This is a workaround for headless toolkits.  It would be
1543         // better to override this method but it is declared final.
1544         // "this instanceof" syntax defeats polymorphism.
1545         // --mm, 03/03/00
1546         if (this instanceof HeadlessToolkit) {
1547             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1548                 .getDesktopProperty(propertyName);
1549         }
1550 
1551         if (desktopProperties.isEmpty()) {
1552             initializeDesktopProperties();
1553         }
1554 
1555         Object value;
1556 
1557         // This property should never be cached
1558         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1559             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1560         }
1561 
1562         value = desktopProperties.get(propertyName);
1563 
1564         if (value == null) {
1565             value = lazilyLoadDesktopProperty(propertyName);
1566 
1567             if (value != null) {
1568                 setDesktopProperty(propertyName, value);
1569             }
1570         }
1571 
1572         /* for property "awt.font.desktophints" */
1573         if (value instanceof RenderingHints) {
1574             value = ((RenderingHints)value).clone();
1575         }
1576 
1577         return value;
1578     }
1579 
1580     /**
1581      * Sets the named desktop property to the specified value and fires a
1582      * property change event to notify any listeners that the value has changed.
1583      *
1584      * @param  name the property name
1585      * @param  newValue the new property value
1586      */
1587     protected final void setDesktopProperty(String name, Object newValue) {
1588         // This is a workaround for headless toolkits.  It would be
1589         // better to override this method but it is declared final.
1590         // "this instanceof" syntax defeats polymorphism.
1591         // --mm, 03/03/00
1592         if (this instanceof HeadlessToolkit) {
1593             ((HeadlessToolkit)this).getUnderlyingToolkit()
1594                 .setDesktopProperty(name, newValue);
1595             return;
1596         }
1597         Object oldValue;
1598 
1599         synchronized (this) {
1600             oldValue = desktopProperties.get(name);
1601             desktopProperties.put(name, newValue);
1602         }
1603 
1604         // Don't fire change event if old and new values are null.
1605         // It helps to avoid recursive resending of WM_THEMECHANGED
1606         if (oldValue != null || newValue != null) {
1607             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1608         }
1609     }
1610 
1611     /**
1612      * An opportunity to lazily evaluate desktop property values.
1613      * @return the desktop property or null
1614      * @param name the name
1615      */
1616     protected Object lazilyLoadDesktopProperty(String name) {
1617         return null;
1618     }
1619 
1620     /**
1621      * initializeDesktopProperties
1622      */
1623     protected void initializeDesktopProperties() {
1624     }
1625 
1626     /**
1627      * Adds the specified property change listener for the named desktop
1628      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1629      * its property name is ignored, and the wrapped listener is added.
1630      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1631      * no exception is thrown and no action is performed.
1632      *
1633      * @param   name The name of the property to listen for
1634      * @param   pcl The property change listener
1635      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1636                 PropertyChangeListener)
1637      * @since   1.2
1638      */
1639     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1640         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1641     }
1642 
1643     /**
1644      * Removes the specified property change listener for the named
1645      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1646      * is removed, its property name is ignored, and
1647      * the wrapped listener is removed.
1648      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1649      * no exception is thrown and no action is performed.
1650      *
1651      * @param   name The name of the property to remove
1652      * @param   pcl The property change listener
1653      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1654                 PropertyChangeListener)
1655      * @since   1.2
1656      */
1657     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1658         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1659     }
1660 
1661     /**
1662      * Returns an array of all the property change listeners
1663      * registered on this toolkit. The returned array
1664      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1665      * that associate listeners with the names of desktop properties.
1666      *
1667      * @return all of this toolkit's {@link PropertyChangeListener}
1668      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1669      *         or an empty array  if no listeners are added
1670      *
1671      * @see PropertyChangeSupport#getPropertyChangeListeners()
1672      * @since 1.4
1673      */
1674     public PropertyChangeListener[] getPropertyChangeListeners() {
1675         return desktopPropsSupport.getPropertyChangeListeners();
1676     }
1677 
1678     /**
1679      * Returns an array of all property change listeners
1680      * associated with the specified name of a desktop property.
1681      *
1682      * @param  propertyName the named property
1683      * @return all of the {@code PropertyChangeListener} objects
1684      *         associated with the specified name of a desktop property
1685      *         or an empty array if no such listeners are added
1686      *
1687      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1688      * @since 1.4
1689      */
1690     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1691         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1692     }
1693 
1694     /**
1695      * The desktop properties.
1696      */
1697     protected final Map<String,Object> desktopProperties =
1698             new HashMap<String,Object>();
1699     /**
1700      * The desktop properties change support.
1701      */
1702     protected final PropertyChangeSupport desktopPropsSupport =
1703             Toolkit.createPropertyChangeSupport(this);
1704 
1705     /**
1706      * Returns whether the always-on-top mode is supported by this toolkit.
1707      * To detect whether the always-on-top mode is supported for a
1708      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1709      * @return {@code true}, if current toolkit supports the always-on-top mode,
1710      *     otherwise returns {@code false}
1711      * @see Window#isAlwaysOnTopSupported
1712      * @see Window#setAlwaysOnTop(boolean)
1713      * @since 1.6
1714      */
1715     public boolean isAlwaysOnTopSupported() {
1716         return true;
1717     }
1718 
1719     /**
1720      * Returns whether the given modality type is supported by this toolkit. If
1721      * a dialog with unsupported modality type is created, then
1722      * {@code Dialog.ModalityType.MODELESS} is used instead.
1723      *
1724      * @param modalityType modality type to be checked for support by this toolkit
1725      *
1726      * @return {@code true}, if current toolkit supports given modality
1727      *     type, {@code false} otherwise
1728      *
1729      * @see java.awt.Dialog.ModalityType
1730      * @see java.awt.Dialog#getModalityType
1731      * @see java.awt.Dialog#setModalityType
1732      *
1733      * @since 1.6
1734      */
1735     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1736 
1737     /**
1738      * Returns whether the given modal exclusion type is supported by this
1739      * toolkit. If an unsupported modal exclusion type property is set on a window,
1740      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1741      *
1742      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1743      *
1744      * @return {@code true}, if current toolkit supports given modal exclusion
1745      *     type, {@code false} otherwise
1746      *
1747      * @see java.awt.Dialog.ModalExclusionType
1748      * @see java.awt.Window#getModalExclusionType
1749      * @see java.awt.Window#setModalExclusionType
1750      *
1751      * @since 1.6
1752      */
1753     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1754 
1755     // 8014718: logging has been removed from SunToolkit
1756 
1757     private static final int LONG_BITS = 64;
1758     private int[] calls = new int[LONG_BITS];
1759     private static volatile long enabledOnToolkitMask;
1760     private AWTEventListener eventListener = null;
1761     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1762 
1763     /*
1764      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1765      * if the listener is proxied.
1766      */
1767     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1768     {
1769         AWTEventListener localL = l;
1770 
1771         if (localL == null) {
1772             return null;
1773         }
1774         // if user passed in a AWTEventListenerProxy object, extract
1775         // the listener
1776         if (l instanceof AWTEventListenerProxy) {
1777             localL = ((AWTEventListenerProxy)l).getListener();
1778         }
1779         return localL;
1780     }
1781 
1782     /**
1783      * Adds an AWTEventListener to receive all AWTEvents dispatched
1784      * system-wide that conform to the given {@code eventMask}.
1785      * <p>
1786      * First, if there is a security manager, its {@code checkPermission}
1787      * method is called with an
1788      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1789      * This may result in a SecurityException.
1790      * <p>
1791      * {@code eventMask} is a bitmask of event types to receive.
1792      * It is constructed by bitwise OR-ing together the event masks
1793      * defined in {@code AWTEvent}.
1794      * <p>
1795      * Note:  event listener use is not recommended for normal
1796      * application use, but are intended solely to support special
1797      * purpose facilities including support for accessibility,
1798      * event record/playback, and diagnostic tracing.
1799      *
1800      * If listener is null, no exception is thrown and no action is performed.
1801      *
1802      * @param    listener   the event listener.
1803      * @param    eventMask  the bitmask of event types to receive
1804      * @throws SecurityException
1805      *        if a security manager exists and its
1806      *        {@code checkPermission} method doesn't allow the operation.
1807      * @see      #removeAWTEventListener
1808      * @see      #getAWTEventListeners
1809      * @see      SecurityManager#checkPermission
1810      * @see      java.awt.AWTEvent
1811      * @see      java.awt.AWTPermission
1812      * @see      java.awt.event.AWTEventListener
1813      * @see      java.awt.event.AWTEventListenerProxy
1814      * @since    1.2
1815      */
1816     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1817         AWTEventListener localL = deProxyAWTEventListener(listener);
1818 
1819         if (localL == null) {
1820             return;
1821         }
1822         SecurityManager security = System.getSecurityManager();
1823         if (security != null) {
1824           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1825         }
1826         synchronized (this) {
1827             SelectiveAWTEventListener selectiveListener =
1828                 listener2SelectiveListener.get(localL);
1829 
1830             if (selectiveListener == null) {
1831                 // Create a new selectiveListener.
1832                 selectiveListener = new SelectiveAWTEventListener(localL,
1833                                                                  eventMask);
1834                 listener2SelectiveListener.put(localL, selectiveListener);
1835                 eventListener = ToolkitEventMulticaster.add(eventListener,
1836                                                             selectiveListener);
1837             }
1838             // OR the eventMask into the selectiveListener's event mask.
1839             selectiveListener.orEventMasks(eventMask);
1840 
1841             enabledOnToolkitMask |= eventMask;
1842 
1843             long mask = eventMask;
1844             for (int i=0; i<LONG_BITS; i++) {
1845                 // If no bits are set, break out of loop.
1846                 if (mask == 0) {
1847                     break;
1848                 }
1849                 if ((mask & 1L) != 0) {  // Always test bit 0.
1850                     calls[i]++;
1851                 }
1852                 mask >>>= 1;  // Right shift, fill with zeros on left.
1853             }
1854         }
1855     }
1856 
1857     /**
1858      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1859      * <p>
1860      * First, if there is a security manager, its {@code checkPermission}
1861      * method is called with an
1862      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1863      * This may result in a SecurityException.
1864      * <p>
1865      * Note:  event listener use is not recommended for normal
1866      * application use, but are intended solely to support special
1867      * purpose facilities including support for accessibility,
1868      * event record/playback, and diagnostic tracing.
1869      *
1870      * If listener is null, no exception is thrown and no action is performed.
1871      *
1872      * @param    listener   the event listener.
1873      * @throws SecurityException
1874      *        if a security manager exists and its
1875      *        {@code checkPermission} method doesn't allow the operation.
1876      * @see      #addAWTEventListener
1877      * @see      #getAWTEventListeners
1878      * @see      SecurityManager#checkPermission
1879      * @see      java.awt.AWTEvent
1880      * @see      java.awt.AWTPermission
1881      * @see      java.awt.event.AWTEventListener
1882      * @see      java.awt.event.AWTEventListenerProxy
1883      * @since    1.2
1884      */
1885     public void removeAWTEventListener(AWTEventListener listener) {
1886         AWTEventListener localL = deProxyAWTEventListener(listener);
1887 
1888         if (listener == null) {
1889             return;
1890         }
1891         SecurityManager security = System.getSecurityManager();
1892         if (security != null) {
1893             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1894         }
1895 
1896         synchronized (this) {
1897             SelectiveAWTEventListener selectiveListener =
1898                 listener2SelectiveListener.get(localL);
1899 
1900             if (selectiveListener != null) {
1901                 listener2SelectiveListener.remove(localL);
1902                 int[] listenerCalls = selectiveListener.getCalls();
1903                 for (int i=0; i<LONG_BITS; i++) {
1904                     calls[i] -= listenerCalls[i];
1905                     assert calls[i] >= 0: "Negative Listeners count";
1906 
1907                     if (calls[i] == 0) {
1908                         enabledOnToolkitMask &= ~(1L<<i);
1909                     }
1910                 }
1911             }
1912             eventListener = ToolkitEventMulticaster.remove(eventListener,
1913             (selectiveListener == null) ? localL : selectiveListener);
1914         }
1915     }
1916 
1917     static boolean enabledOnToolkit(long eventMask) {
1918         return (enabledOnToolkitMask & eventMask) != 0;
1919         }
1920 
1921     synchronized int countAWTEventListeners(long eventMask) {
1922         int ci = 0;
1923         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1924         }
1925         ci--;
1926         return calls[ci];
1927     }
1928     /**
1929      * Returns an array of all the {@code AWTEventListener}s
1930      * registered on this toolkit.
1931      * If there is a security manager, its {@code checkPermission}
1932      * method is called with an
1933      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1934      * This may result in a SecurityException.
1935      * Listeners can be returned
1936      * within {@code AWTEventListenerProxy} objects, which also contain
1937      * the event mask for the given listener.
1938      * Note that listener objects
1939      * added multiple times appear only once in the returned array.
1940      *
1941      * @return all of the {@code AWTEventListener}s or an empty
1942      *         array if no listeners are currently registered
1943      * @throws SecurityException
1944      *        if a security manager exists and its
1945      *        {@code checkPermission} method doesn't allow the operation.
1946      * @see      #addAWTEventListener
1947      * @see      #removeAWTEventListener
1948      * @see      SecurityManager#checkPermission
1949      * @see      java.awt.AWTEvent
1950      * @see      java.awt.AWTPermission
1951      * @see      java.awt.event.AWTEventListener
1952      * @see      java.awt.event.AWTEventListenerProxy
1953      * @since 1.4
1954      */
1955     public AWTEventListener[] getAWTEventListeners() {
1956         SecurityManager security = System.getSecurityManager();
1957         if (security != null) {
1958             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1959         }
1960         synchronized (this) {
1961             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1962 
1963             AWTEventListener[] ret = new AWTEventListener[la.length];
1964             for (int i = 0; i < la.length; i++) {
1965                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1966                 AWTEventListener tempL = sael.getListener();
1967                 //assert tempL is not an AWTEventListenerProxy - we should
1968                 // have weeded them all out
1969                 // don't want to wrap a proxy inside a proxy
1970                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1971             }
1972             return ret;
1973         }
1974     }
1975 
1976     /**
1977      * Returns an array of all the {@code AWTEventListener}s
1978      * registered on this toolkit which listen to all of the event
1979      * types specified in the {@code eventMask} argument.
1980      * If there is a security manager, its {@code checkPermission}
1981      * method is called with an
1982      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1983      * This may result in a SecurityException.
1984      * Listeners can be returned
1985      * within {@code AWTEventListenerProxy} objects, which also contain
1986      * the event mask for the given listener.
1987      * Note that listener objects
1988      * added multiple times appear only once in the returned array.
1989      *
1990      * @param  eventMask the bitmask of event types to listen for
1991      * @return all of the {@code AWTEventListener}s registered
1992      *         on this toolkit for the specified
1993      *         event types, or an empty array if no such listeners
1994      *         are currently registered
1995      * @throws SecurityException
1996      *        if a security manager exists and its
1997      *        {@code checkPermission} method doesn't allow the operation.
1998      * @see      #addAWTEventListener
1999      * @see      #removeAWTEventListener
2000      * @see      SecurityManager#checkPermission
2001      * @see      java.awt.AWTEvent
2002      * @see      java.awt.AWTPermission
2003      * @see      java.awt.event.AWTEventListener
2004      * @see      java.awt.event.AWTEventListenerProxy
2005      * @since 1.4
2006      */
2007     public AWTEventListener[] getAWTEventListeners(long eventMask) {
2008         SecurityManager security = System.getSecurityManager();
2009         if (security != null) {
2010             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
2011         }
2012         synchronized (this) {
2013             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
2014 
2015             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
2016 
2017             for (int i = 0; i < la.length; i++) {
2018                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2019                 if ((sael.getEventMask() & eventMask) == eventMask) {
2020                     //AWTEventListener tempL = sael.getListener();
2021                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
2022                                                        sael.getListener()));
2023                 }
2024             }
2025             return list.toArray(new AWTEventListener[0]);
2026         }
2027     }
2028 
2029     /*
2030      * This method notifies any AWTEventListeners that an event
2031      * is about to be dispatched.
2032      *
2033      * @param theEvent the event which will be dispatched.
2034      */
2035     void notifyAWTEventListeners(AWTEvent theEvent) {
2036         // This is a workaround for headless toolkits.  It would be
2037         // better to override this method but it is declared package private.
2038         // "this instanceof" syntax defeats polymorphism.
2039         // --mm, 03/03/00
2040         if (this instanceof HeadlessToolkit) {
2041             ((HeadlessToolkit)this).getUnderlyingToolkit()
2042                 .notifyAWTEventListeners(theEvent);
2043             return;
2044         }
2045 
2046         AWTEventListener eventListener = this.eventListener;
2047         if (eventListener != null) {
2048             eventListener.eventDispatched(theEvent);
2049         }
2050     }
2051 
2052     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2053         implements AWTEventListener {
2054         // Implementation cloned from AWTEventMulticaster.
2055 
2056         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2057             super(a, b);
2058         }
2059 
2060         @SuppressWarnings("overloads")
2061         static AWTEventListener add(AWTEventListener a,
2062                                     AWTEventListener b) {
2063             if (a == null)  return b;
2064             if (b == null)  return a;
2065             return new ToolkitEventMulticaster(a, b);
2066         }
2067 
2068         @SuppressWarnings("overloads")
2069         static AWTEventListener remove(AWTEventListener l,
2070                                        AWTEventListener oldl) {
2071             return (AWTEventListener) removeInternal(l, oldl);
2072         }
2073 
2074         // #4178589: must overload remove(EventListener) to call our add()
2075         // instead of the static addInternal() so we allocate a
2076         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2077         // Note: this method is called by AWTEventListener.removeInternal(),
2078         // so its method signature must match AWTEventListener.remove().
2079         protected EventListener remove(EventListener oldl) {
2080             if (oldl == a)  return b;
2081             if (oldl == b)  return a;
2082             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2083             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2084             if (a2 == a && b2 == b) {
2085                 return this;    // it's not here
2086             }
2087             return add(a2, b2);
2088         }
2089 
2090         public void eventDispatched(AWTEvent event) {
2091             ((AWTEventListener)a).eventDispatched(event);
2092             ((AWTEventListener)b).eventDispatched(event);
2093         }
2094     }
2095 
2096     private class SelectiveAWTEventListener implements AWTEventListener {
2097         AWTEventListener listener;
2098         private long eventMask;
2099         // This array contains the number of times to call the eventlistener
2100         // for each event type.
2101         int[] calls = new int[Toolkit.LONG_BITS];
2102 
2103         public AWTEventListener getListener() {return listener;}
2104         public long getEventMask() {return eventMask;}
2105         public int[] getCalls() {return calls;}
2106 
2107         public void orEventMasks(long mask) {
2108             eventMask |= mask;
2109             // For each event bit set in mask, increment its call count.
2110             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2111                 // If no bits are set, break out of loop.
2112                 if (mask == 0) {
2113                     break;
2114                 }
2115                 if ((mask & 1L) != 0) {  // Always test bit 0.
2116                     calls[i]++;
2117                 }
2118                 mask >>>= 1;  // Right shift, fill with zeros on left.
2119             }
2120         }
2121 
2122         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2123             listener = l;
2124             eventMask = mask;
2125         }
2126 
2127         public void eventDispatched(AWTEvent event) {
2128             long eventBit = 0; // Used to save the bit of the event type.
2129             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2130                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2131                  event.id <= ComponentEvent.COMPONENT_LAST)
2132              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2133                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2134                  event.id <= ContainerEvent.CONTAINER_LAST)
2135              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2136                  event.id >= FocusEvent.FOCUS_FIRST &&
2137                  event.id <= FocusEvent.FOCUS_LAST)
2138              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2139                  event.id >= KeyEvent.KEY_FIRST &&
2140                  event.id <= KeyEvent.KEY_LAST)
2141              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2142                  event.id == MouseEvent.MOUSE_WHEEL)
2143              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2144                  (event.id == MouseEvent.MOUSE_MOVED ||
2145                   event.id == MouseEvent.MOUSE_DRAGGED))
2146              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2147                  event.id != MouseEvent.MOUSE_MOVED &&
2148                  event.id != MouseEvent.MOUSE_DRAGGED &&
2149                  event.id != MouseEvent.MOUSE_WHEEL &&
2150                  event.id >= MouseEvent.MOUSE_FIRST &&
2151                  event.id <= MouseEvent.MOUSE_LAST)
2152              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2153                  (event.id >= WindowEvent.WINDOW_FIRST &&
2154                  event.id <= WindowEvent.WINDOW_LAST))
2155              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2156                  event.id >= ActionEvent.ACTION_FIRST &&
2157                  event.id <= ActionEvent.ACTION_LAST)
2158              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2159                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2160                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2161              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2162                  event.id >= ItemEvent.ITEM_FIRST &&
2163                  event.id <= ItemEvent.ITEM_LAST)
2164              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2165                  event.id >= TextEvent.TEXT_FIRST &&
2166                  event.id <= TextEvent.TEXT_LAST)
2167              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2168                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2169                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2170              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2171                  event.id >= PaintEvent.PAINT_FIRST &&
2172                  event.id <= PaintEvent.PAINT_LAST)
2173              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2174                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2175                  event.id <= InvocationEvent.INVOCATION_LAST)
2176              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2177                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2178              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2179                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2180                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2181              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2182                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2183              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2184                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2185                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2186                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2187                     (event instanceof sun.awt.UngrabEvent))) {
2188                 // Get the index of the call count for this event type.
2189                 // Instead of using Math.log(...) we will calculate it with
2190                 // bit shifts. That's what previous implementation looked like:
2191                 //
2192                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2193                 int ci = 0;
2194                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2195                 }
2196                 ci--;
2197                 // Call the listener as many times as it was added for this
2198                 // event type.
2199                 for (int i=0; i<calls[ci]; i++) {
2200                     listener.eventDispatched(event);
2201                 }
2202             }
2203         }
2204     }
2205 
2206     /**
2207      * Returns a map of visual attributes for the abstract level description
2208      * of the given input method highlight, or null if no mapping is found.
2209      * The style field of the input method highlight is ignored. The map
2210      * returned is unmodifiable.
2211      * @param highlight input method highlight
2212      * @return style attribute map, or {@code null}
2213      * @exception HeadlessException if
2214      *     {@code GraphicsEnvironment.isHeadless} returns true
2215      * @see       java.awt.GraphicsEnvironment#isHeadless
2216      * @since 1.3
2217      */
2218     public abstract Map<java.awt.font.TextAttribute,?>
2219         mapInputMethodHighlight(InputMethodHighlight highlight)
2220         throws HeadlessException;
2221 
2222     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2223         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2224             return new DesktopPropertyChangeSupport(toolkit);
2225         } else {
2226             return new PropertyChangeSupport(toolkit);
2227         }
2228     }
2229 
2230     @SuppressWarnings("serial")
2231     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2232 
2233         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2234                 new StringBuilder("desktop property change support key");
2235         private final Object source;
2236 
2237         public DesktopPropertyChangeSupport(Object sourceBean) {
2238             super(sourceBean);
2239             source = sourceBean;
2240         }
2241 
2242         @Override
2243         public synchronized void addPropertyChangeListener(
2244                 String propertyName,
2245                 PropertyChangeListener listener)
2246         {
2247             PropertyChangeSupport pcs = (PropertyChangeSupport)
2248                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2249             if (null == pcs) {
2250                 pcs = new PropertyChangeSupport(source);
2251                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2252             }
2253             pcs.addPropertyChangeListener(propertyName, listener);
2254         }
2255 
2256         @Override
2257         public synchronized void removePropertyChangeListener(
2258                 String propertyName,
2259                 PropertyChangeListener listener)
2260         {
2261             PropertyChangeSupport pcs = (PropertyChangeSupport)
2262                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2263             if (null != pcs) {
2264                 pcs.removePropertyChangeListener(propertyName, listener);
2265             }
2266         }
2267 
2268         @Override
2269         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2270         {
2271             PropertyChangeSupport pcs = (PropertyChangeSupport)
2272                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2273             if (null != pcs) {
2274                 return pcs.getPropertyChangeListeners();
2275             } else {
2276                 return new PropertyChangeListener[0];
2277             }
2278         }
2279 
2280         @Override
2281         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2282         {
2283             PropertyChangeSupport pcs = (PropertyChangeSupport)
2284                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2285             if (null != pcs) {
2286                 return pcs.getPropertyChangeListeners(propertyName);
2287             } else {
2288                 return new PropertyChangeListener[0];
2289             }
2290         }
2291 
2292         @Override
2293         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2294             PropertyChangeSupport pcs = (PropertyChangeSupport)
2295                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2296             if (null == pcs) {
2297                 pcs = new PropertyChangeSupport(source);
2298                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2299             }
2300             pcs.addPropertyChangeListener(listener);
2301         }
2302 
2303         @Override
2304         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2305             PropertyChangeSupport pcs = (PropertyChangeSupport)
2306                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2307             if (null != pcs) {
2308                 pcs.removePropertyChangeListener(listener);
2309             }
2310         }
2311 
2312         /*
2313          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2314          * use this method.  If this will be changed we will need to change this class.
2315          */
2316         @Override
2317         public void firePropertyChange(final PropertyChangeEvent evt) {
2318             Object oldValue = evt.getOldValue();
2319             Object newValue = evt.getNewValue();
2320             String propertyName = evt.getPropertyName();
2321             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2322                 return;
2323             }
2324             Runnable updater = new Runnable() {
2325                 public void run() {
2326                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2327                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2328                     if (null != pcs) {
2329                         pcs.firePropertyChange(evt);
2330                     }
2331                 }
2332             };
2333             final AppContext currentAppContext = AppContext.getAppContext();
2334             for (AppContext appContext : AppContext.getAppContexts()) {
2335                 if (null == appContext || appContext.isDisposed()) {
2336                     continue;
2337                 }
2338                 if (currentAppContext == appContext) {
2339                     updater.run();
2340                 } else {
2341                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2342                     SunToolkit.postEvent(appContext, e);
2343                 }
2344             }
2345         }
2346     }
2347 
2348     /**
2349     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2350     * {@code EventQueue}.
2351     * <br>
2352     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2353     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2354     * startup by the following command:
2355     * <pre>
2356     * java -Dsun.awt.enableExtraMouseButtons=false Application
2357     * </pre>
2358     * Alternatively, the property could be set in the application by using the following code:
2359     * <pre>
2360     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2361     * </pre>
2362     * before the {@code Toolkit} class initialization.
2363     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2364     * initialized with {@code true}.
2365     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2366     *
2367     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2368     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2369     *         {@code false} otherwise
2370     * @see System#getProperty(String propertyName)
2371     * @see System#setProperty(String propertyName, String value)
2372     * @see java.awt.EventQueue
2373     * @since 1.7
2374      */
2375     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2376         GraphicsEnvironment.checkHeadless();
2377 
2378         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2379     }
2380 }