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
 508      * {@linkplain Character#isWhitespace(int) white space} characters or
 509      * {@code null} then the method returns immediately. All other errors are
 510      * handled via an AWTError exception.
 511      */
 512     private static void loadAssistiveTechnologies() {
 513         // Load any assistive technologies
 514         if (atNames != null && !atNames.isBlank()) {
 515             ClassLoader cl = ClassLoader.getSystemClassLoader();
 516             Set<String> names = Arrays.stream(atNames.split(","))
 517                                       .map(String::trim)
 518                                       .collect(Collectors.toSet());
 519             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 520             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 521                 try {
 522                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 523                         String name = p.getName();
 524                         if (names.contains(name) && !providers.containsKey(name)) {
 525                             p.activate();
 526                             providers.put(name, p);
 527                         }
 528                     }
 529                 } catch (java.util.ServiceConfigurationError | Exception e) {
 530                     newAWTError(e, "Could not load or activate service provider");
 531                 }
 532                 return null;
 533             });
 534             names.stream()
 535                  .filter(n -> !providers.containsKey(n))
 536                  .forEach(Toolkit::fallbackToLoadClassForAT);
 537         }
 538     }
 539 
 540     /**
 541      * Gets the default toolkit.
 542      * <p>
 543      * If a system property named {@code "java.awt.headless"} is set
 544      * to {@code true} then the headless implementation
 545      * of {@code Toolkit} is used,
 546      * otherwise the default platform-specific implementation of
 547      * {@code Toolkit} is used.
 548      * <p>
 549      * If this Toolkit is not a headless implementation and if they exist, service
 550      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 551      * if specified by the system property
 552      * {@code javax.accessibility.assistive_technologies}.
 553      * <p>
 554      * An example of setting this property is to invoke Java with
 555      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 556      * In addition to MyServiceProvider other service providers can be specified
 557      * using a comma separated list.  Service providers are loaded after the AWT
 558      * toolkit is created.
 559      * <p>
 560      * If the list of assistive technology providers as provided through system
 561      * property "{@systemProperty javax.accessibility.assistive_technologies}"
 562      * is the empty string or contains only
 563      * {@linkplain Character#isWhitespace(int) white space} characters then the
 564      * method returns immediately. All other errors are handled via an AWTError
 565      * exception.
 566      * <p>
 567      * The names specified in the assistive_technologies property are used to query
 568      * each service provider implementation.  If the requested name matches the
 569      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 570      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 571      * matching service provider.
 572      *
 573      * @implSpec
 574      * If assistive technology service providers are not specified with a system
 575      * property this implementation will look in a properties file located as follows:
 576      * <ul>
 577      * <li> {@code ${user.home}/.accessibility.properties}
 578      * <li> {@code ${java.home}/conf/accessibility.properties}
 579      * </ul>
 580      * Only the first of these files to be located will be consulted.  The requested
 581      * service providers are specified by setting the {@code assistive_technologies=}
 582      * property.  A single provider or a comma separated list of providers can be
 583      * specified.
 584      *
 585      * @return     the default toolkit.
 586      * @exception  AWTError  if a toolkit could not be found, or
 587      *                 if one could not be accessed or instantiated.
 588      * @see java.util.ServiceLoader
 589      * @see javax.accessibility.AccessibilityProvider
 590      */
 591     public static synchronized Toolkit getDefaultToolkit() {
 592         if (toolkit == null) {
 593             java.security.AccessController.doPrivileged(
 594                     new java.security.PrivilegedAction<Void>() {
 595                 public Void run() {
 596                     Class<?> cls = null;
 597                     String nm = System.getProperty("awt.toolkit");
 598                     try {
 599                         cls = Class.forName(nm);
 600                     } catch (ClassNotFoundException e) {
 601                         ClassLoader cl = ClassLoader.getSystemClassLoader();
 602                         if (cl != null) {
 603                             try {
 604                                 cls = cl.loadClass(nm);
 605                             } catch (final ClassNotFoundException ignored) {
 606                                 throw new AWTError("Toolkit not found: " + nm);
 607                             }
 608                         }
 609                     }
 610                     try {
 611                         if (cls != null) {
 612                             toolkit = (Toolkit)cls.getConstructor().newInstance();
 613                             if (GraphicsEnvironment.isHeadless()) {
 614                                 toolkit = new HeadlessToolkit(toolkit);
 615                             }
 616                         }
 617                     } catch (final ReflectiveOperationException ignored) {
 618                         throw new AWTError("Could not create Toolkit: " + nm);
 619                     }
 620                     return null;
 621                 }
 622             });
 623             if (!GraphicsEnvironment.isHeadless()) {
 624                 loadAssistiveTechnologies();
 625             }
 626         }
 627         return toolkit;
 628     }
 629 
 630     /**
 631      * Returns an image which gets pixel data from the specified file,
 632      * whose format can be either GIF, JPEG or PNG.
 633      * The underlying toolkit attempts to resolve multiple requests
 634      * with the same filename to the same returned Image.
 635      * <p>
 636      * Since the mechanism required to facilitate this sharing of
 637      * {@code Image} objects may continue to hold onto images
 638      * that are no longer in use for an indefinite period of time,
 639      * developers are encouraged to implement their own caching of
 640      * images by using the {@link #createImage(java.lang.String) createImage}
 641      * variant wherever available.
 642      * If the image data contained in the specified file changes,
 643      * the {@code Image} object returned from this method may
 644      * still contain stale information which was loaded from the
 645      * file after a prior call.
 646      * Previously loaded image data can be manually discarded by
 647      * calling the {@link Image#flush flush} method on the
 648      * returned {@code Image}.
 649      * <p>
 650      * This method first checks if there is a security manager installed.
 651      * If so, the method calls the security manager's
 652      * {@code checkRead} method with the file specified to ensure
 653      * that the access to the image is allowed.
 654      * @param     filename   the name of a file containing pixel data
 655      *                         in a recognized file format.
 656      * @return    an image which gets its pixel data from
 657      *                         the specified file.
 658      * @throws SecurityException  if a security manager exists and its
 659      *                            checkRead method doesn't allow the operation.
 660      * @see #createImage(java.lang.String)
 661      */
 662     public abstract Image getImage(String filename);
 663 
 664     /**
 665      * Returns an image which gets pixel data from the specified URL.
 666      * The pixel data referenced by the specified URL must be in one
 667      * of the following formats: GIF, JPEG or PNG.
 668      * The underlying toolkit attempts to resolve multiple requests
 669      * with the same URL to the same returned Image.
 670      * <p>
 671      * Since the mechanism required to facilitate this sharing of
 672      * {@code Image} objects may continue to hold onto images
 673      * that are no longer in use for an indefinite period of time,
 674      * developers are encouraged to implement their own caching of
 675      * images by using the {@link #createImage(java.net.URL) createImage}
 676      * variant wherever available.
 677      * If the image data stored at the specified URL changes,
 678      * the {@code Image} object returned from this method may
 679      * still contain stale information which was fetched from the
 680      * URL after a prior call.
 681      * Previously loaded image data can be manually discarded by
 682      * calling the {@link Image#flush flush} method on the
 683      * returned {@code Image}.
 684      * <p>
 685      * This method first checks if there is a security manager installed.
 686      * If so, the method calls the security manager's
 687      * {@code checkPermission} method with the corresponding
 688      * permission to ensure that the access to the image is allowed.
 689      * If the connection to the specified URL requires
 690      * either {@code URLPermission} or {@code SocketPermission},
 691      * then {@code URLPermission} is used for security checks.
 692      * @param     url   the URL to use in fetching the pixel data.
 693      * @return    an image which gets its pixel data from
 694      *                         the specified URL.
 695      * @throws SecurityException  if a security manager exists and its
 696      *                            checkPermission method doesn't allow
 697      *                            the operation.
 698      * @see #createImage(java.net.URL)
 699      */
 700     public abstract Image getImage(URL url);
 701 
 702     /**
 703      * Returns an image which gets pixel data from the specified file.
 704      * The returned Image is a new object which will not be shared
 705      * with any other caller of this method or its getImage variant.
 706      * <p>
 707      * This method first checks if there is a security manager installed.
 708      * If so, the method calls the security manager's
 709      * {@code checkRead} method with the specified file to ensure
 710      * that the image creation is allowed.
 711      * @param     filename   the name of a file containing pixel data
 712      *                         in a recognized file format.
 713      * @return    an image which gets its pixel data from
 714      *                         the specified file.
 715      * @throws SecurityException  if a security manager exists and its
 716      *                            checkRead method doesn't allow the operation.
 717      * @see #getImage(java.lang.String)
 718      */
 719     public abstract Image createImage(String filename);
 720 
 721     /**
 722      * Returns an image which gets pixel data from the specified URL.
 723      * The returned Image is a new object which will not be shared
 724      * with any other caller of this method or its getImage variant.
 725      * <p>
 726      * This method first checks if there is a security manager installed.
 727      * If so, the method calls the security manager's
 728      * {@code checkPermission} method with the corresponding
 729      * permission to ensure that the image creation is allowed.
 730      * If the connection to the specified URL requires
 731      * either {@code URLPermission} or {@code SocketPermission},
 732      * then {@code URLPermission} is used for security checks.
 733      * @param     url   the URL to use in fetching the pixel data.
 734      * @return    an image which gets its pixel data from
 735      *                         the specified URL.
 736      * @throws SecurityException  if a security manager exists and its
 737      *                            checkPermission method doesn't allow
 738      *                            the operation.
 739      * @see #getImage(java.net.URL)
 740      */
 741     public abstract Image createImage(URL url);
 742 
 743     /**
 744      * Prepares an image for rendering.
 745      * <p>
 746      * If the values of the width and height arguments are both
 747      * {@code -1}, this method prepares the image for rendering
 748      * on the default screen; otherwise, this method prepares an image
 749      * for rendering on the default screen at the specified width and height.
 750      * <p>
 751      * The image data is downloaded asynchronously in another thread,
 752      * and an appropriately scaled screen representation of the image is
 753      * generated.
 754      * <p>
 755      * This method is called by components {@code prepareImage}
 756      * methods.
 757      * <p>
 758      * Information on the flags returned by this method can be found
 759      * with the definition of the {@code ImageObserver} interface.
 760 
 761      * @param     image      the image for which to prepare a
 762      *                           screen representation.
 763      * @param     width      the width of the desired screen
 764      *                           representation, or {@code -1}.
 765      * @param     height     the height of the desired screen
 766      *                           representation, or {@code -1}.
 767      * @param     observer   the {@code ImageObserver}
 768      *                           object to be notified as the
 769      *                           image is being prepared.
 770      * @return    {@code true} if the image has already been
 771      *                 fully prepared; {@code false} otherwise.
 772      * @see       java.awt.Component#prepareImage(java.awt.Image,
 773      *                 java.awt.image.ImageObserver)
 774      * @see       java.awt.Component#prepareImage(java.awt.Image,
 775      *                 int, int, java.awt.image.ImageObserver)
 776      * @see       java.awt.image.ImageObserver
 777      */
 778     public abstract boolean prepareImage(Image image, int width, int height,
 779                                          ImageObserver observer);
 780 
 781     /**
 782      * Indicates the construction status of a specified image that is
 783      * being prepared for display.
 784      * <p>
 785      * If the values of the width and height arguments are both
 786      * {@code -1}, this method returns the construction status of
 787      * a screen representation of the specified image in this toolkit.
 788      * Otherwise, this method returns the construction status of a
 789      * scaled representation of the image at the specified width
 790      * and height.
 791      * <p>
 792      * This method does not cause the image to begin loading.
 793      * An application must call {@code prepareImage} to force
 794      * the loading of an image.
 795      * <p>
 796      * This method is called by the component's {@code checkImage}
 797      * methods.
 798      * <p>
 799      * Information on the flags returned by this method can be found
 800      * with the definition of the {@code ImageObserver} interface.
 801      * @param     image   the image whose status is being checked.
 802      * @param     width   the width of the scaled version whose status is
 803      *                 being checked, or {@code -1}.
 804      * @param     height  the height of the scaled version whose status
 805      *                 is being checked, or {@code -1}.
 806      * @param     observer   the {@code ImageObserver} object to be
 807      *                 notified as the image is being prepared.
 808      * @return    the bitwise inclusive <strong>OR</strong> of the
 809      *                 {@code ImageObserver} flags for the
 810      *                 image data that is currently available.
 811      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 812      *                 int, int, java.awt.image.ImageObserver)
 813      * @see       java.awt.Component#checkImage(java.awt.Image,
 814      *                 java.awt.image.ImageObserver)
 815      * @see       java.awt.Component#checkImage(java.awt.Image,
 816      *                 int, int, java.awt.image.ImageObserver)
 817      * @see       java.awt.image.ImageObserver
 818      */
 819     public abstract int checkImage(Image image, int width, int height,
 820                                    ImageObserver observer);
 821 
 822     /**
 823      * Creates an image with the specified image producer.
 824      * @param     producer the image producer to be used.
 825      * @return    an image with the specified image producer.
 826      * @see       java.awt.Image
 827      * @see       java.awt.image.ImageProducer
 828      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 829      */
 830     public abstract Image createImage(ImageProducer producer);
 831 
 832     /**
 833      * Creates an image which decodes the image stored in the specified
 834      * byte array.
 835      * <p>
 836      * The data must be in some image format, such as GIF or JPEG,
 837      * that is supported by this toolkit.
 838      * @param     imagedata   an array of bytes, representing
 839      *                         image data in a supported image format.
 840      * @return    an image.
 841      * @since     1.1
 842      */
 843     public Image createImage(byte[] imagedata) {
 844         return createImage(imagedata, 0, imagedata.length);
 845     }
 846 
 847     /**
 848      * Creates an image which decodes the image stored in the specified
 849      * byte array, and at the specified offset and length.
 850      * The data must be in some image format, such as GIF or JPEG,
 851      * that is supported by this toolkit.
 852      * @param     imagedata   an array of bytes, representing
 853      *                         image data in a supported image format.
 854      * @param     imageoffset  the offset of the beginning
 855      *                         of the data in the array.
 856      * @param     imagelength  the length of the data in the array.
 857      * @return    an image.
 858      * @since     1.1
 859      */
 860     public abstract Image createImage(byte[] imagedata,
 861                                       int imageoffset,
 862                                       int imagelength);
 863 
 864     /**
 865      * Gets a {@code PrintJob} object which is the result of initiating
 866      * a print operation on the toolkit's platform.
 867      * <p>
 868      * Each actual implementation of this method should first check if there
 869      * is a security manager installed. If there is, the method should call
 870      * the security manager's {@code checkPrintJobAccess} method to
 871      * ensure initiation of a print operation is allowed. If the default
 872      * implementation of {@code checkPrintJobAccess} is used (that is,
 873      * that method is not overriden), then this results in a call to the
 874      * security manager's {@code checkPermission} method with a
 875      * {@code RuntimePermission("queuePrintJob")} permission.
 876      *
 877      * @param   frame the parent of the print dialog. May not be null.
 878      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 879      *          to "".
 880      * @param   props a Properties object containing zero or more properties.
 881      *          Properties are not standardized and are not consistent across
 882      *          implementations. Because of this, PrintJobs which require job
 883      *          and page control should use the version of this function which
 884      *          takes JobAttributes and PageAttributes objects. This object
 885      *          may be updated to reflect the user's job choices on exit. May
 886      *          be null.
 887      * @return  a {@code PrintJob} object, or {@code null} if the
 888      *          user cancelled the print job.
 889      * @throws  NullPointerException if frame is null
 890      * @throws  SecurityException if this thread is not allowed to initiate a
 891      *          print job request
 892      * @see     java.awt.GraphicsEnvironment#isHeadless
 893      * @see     java.awt.PrintJob
 894      * @see     java.lang.RuntimePermission
 895      * @since   1.1
 896      */
 897     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 898                                          Properties props);
 899 
 900     /**
 901      * Gets a {@code PrintJob} object which is the result of initiating
 902      * a print operation on the toolkit's platform.
 903      * <p>
 904      * Each actual implementation of this method should first check if there
 905      * is a security manager installed. If there is, the method should call
 906      * the security manager's {@code checkPrintJobAccess} method to
 907      * ensure initiation of a print operation is allowed. If the default
 908      * implementation of {@code checkPrintJobAccess} is used (that is,
 909      * that method is not overriden), then this results in a call to the
 910      * security manager's {@code checkPermission} method with a
 911      * {@code RuntimePermission("queuePrintJob")} permission.
 912      *
 913      * @param   frame the parent of the print dialog. May not be null.
 914      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 915      *          to "".
 916      * @param   jobAttributes a set of job attributes which will control the
 917      *          PrintJob. The attributes will be updated to reflect the user's
 918      *          choices as outlined in the JobAttributes documentation. May be
 919      *          null.
 920      * @param   pageAttributes a set of page attributes which will control the
 921      *          PrintJob. The attributes will be applied to every page in the
 922      *          job. The attributes will be updated to reflect the user's
 923      *          choices as outlined in the PageAttributes documentation. May be
 924      *          null.
 925      * @return  a {@code PrintJob} object, or {@code null} if the
 926      *          user cancelled the print job.
 927      * @throws  NullPointerException if frame is null
 928      * @throws  IllegalArgumentException if pageAttributes specifies differing
 929      *          cross feed and feed resolutions. Also if this thread has
 930      *          access to the file system and jobAttributes specifies
 931      *          print to file, and the specified destination file exists but
 932      *          is a directory rather than a regular file, does not exist but
 933      *          cannot be created, or cannot be opened for any other reason.
 934      *          However in the case of print to file, if a dialog is also
 935      *          requested to be displayed then the user will be given an
 936      *          opportunity to select a file and proceed with printing.
 937      *          The dialog will ensure that the selected output file
 938      *          is valid before returning from this method.
 939      * @throws  SecurityException if this thread is not allowed to initiate a
 940      *          print job request, or if jobAttributes specifies print to file,
 941      *          and this thread is not allowed to access the file system
 942      * @see     java.awt.PrintJob
 943      * @see     java.awt.GraphicsEnvironment#isHeadless
 944      * @see     java.lang.RuntimePermission
 945      * @see     java.awt.JobAttributes
 946      * @see     java.awt.PageAttributes
 947      * @since   1.3
 948      */
 949     public PrintJob getPrintJob(Frame frame, String jobtitle,
 950                                 JobAttributes jobAttributes,
 951                                 PageAttributes pageAttributes) {
 952         // Override to add printing support with new job/page control classes
 953 
 954         if (this != Toolkit.getDefaultToolkit()) {
 955             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 956                                                            jobAttributes,
 957                                                            pageAttributes);
 958         } else {
 959             return getPrintJob(frame, jobtitle, null);
 960         }
 961     }
 962 
 963     /**
 964      * Emits an audio beep depending on native system settings and hardware
 965      * capabilities.
 966      * @since     1.1
 967      */
 968     public abstract void beep();
 969 
 970     /**
 971      * Gets the singleton instance of the system Clipboard which interfaces
 972      * with clipboard facilities provided by the native platform. This
 973      * clipboard enables data transfer between Java programs and native
 974      * applications which use native clipboard facilities.
 975      * <p>
 976      * In addition to any and all default formats text returned by the system
 977      * Clipboard's {@code getTransferData()} method is available in the
 978      * following flavors:
 979      * <ul>
 980      * <li>DataFlavor.stringFlavor</li>
 981      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 982      * </ul>
 983      * As with {@code java.awt.datatransfer.StringSelection}, if the
 984      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 985      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 986      * the system Clipboard's {@code getTransferData()} method for
 987      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 988      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 989      * Because of this, support for
 990      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 991      * <b>deprecated</b>.
 992      * <p>
 993      * Each actual implementation of this method should first check if there
 994      * is a security manager installed. If there is, the method should call
 995      * the security manager's {@link SecurityManager#checkPermission
 996      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 997      *
 998      * @return    the system Clipboard
 999      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1000      * returns true
1001      * @see       java.awt.GraphicsEnvironment#isHeadless
1002      * @see       java.awt.datatransfer.Clipboard
1003      * @see       java.awt.datatransfer.StringSelection
1004      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
1005      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
1006      * @see       java.io.Reader
1007      * @see       java.awt.AWTPermission
1008      * @since     1.1
1009      */
1010     public abstract Clipboard getSystemClipboard()
1011         throws HeadlessException;
1012 
1013     /**
1014      * Gets the singleton instance of the system selection as a
1015      * {@code Clipboard} object. This allows an application to read and
1016      * modify the current, system-wide selection.
1017      * <p>
1018      * An application is responsible for updating the system selection whenever
1019      * the user selects text, using either the mouse or the keyboard.
1020      * Typically, this is implemented by installing a
1021      * {@code FocusListener} on all {@code Component}s which support
1022      * text selection, and, between {@code FOCUS_GAINED} and
1023      * {@code FOCUS_LOST} events delivered to that {@code Component},
1024      * updating the system selection {@code Clipboard} when the selection
1025      * changes inside the {@code Component}. Properly updating the system
1026      * selection ensures that a Java application will interact correctly with
1027      * native applications and other Java applications running simultaneously
1028      * on the system. Note that {@code java.awt.TextComponent} and
1029      * {@code javax.swing.text.JTextComponent} already adhere to this
1030      * policy. When using these classes, and their subclasses, developers need
1031      * not write any additional code.
1032      * <p>
1033      * Some platforms do not support a system selection {@code Clipboard}.
1034      * On those platforms, this method will return {@code null}. In such a
1035      * case, an application is absolved from its responsibility to update the
1036      * system selection {@code Clipboard} as described above.
1037      * <p>
1038      * Each actual implementation of this method should first check if there
1039      * is a security manager installed. If there is, the method should call
1040      * the security manager's {@link SecurityManager#checkPermission
1041      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1042      *
1043      * @return the system selection as a {@code Clipboard}, or
1044      *         {@code null} if the native platform does not support a
1045      *         system selection {@code Clipboard}
1046      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1047      *            returns true
1048      *
1049      * @see java.awt.datatransfer.Clipboard
1050      * @see java.awt.event.FocusListener
1051      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1052      * @see java.awt.event.FocusEvent#FOCUS_LOST
1053      * @see TextComponent
1054      * @see javax.swing.text.JTextComponent
1055      * @see AWTPermission
1056      * @see GraphicsEnvironment#isHeadless
1057      * @since 1.4
1058      */
1059     public Clipboard getSystemSelection() throws HeadlessException {
1060         GraphicsEnvironment.checkHeadless();
1061 
1062         if (this != Toolkit.getDefaultToolkit()) {
1063             return Toolkit.getDefaultToolkit().getSystemSelection();
1064         } else {
1065             GraphicsEnvironment.checkHeadless();
1066             return null;
1067         }
1068     }
1069 
1070     /**
1071      * Determines which modifier key is the appropriate accelerator
1072      * key for menu shortcuts.
1073      * <p>
1074      * Menu shortcuts, which are embodied in the
1075      * {@code MenuShortcut} class, are handled by the
1076      * {@code MenuBar} class.
1077      * <p>
1078      * By default, this method returns {@code Event.CTRL_MASK}.
1079      * Toolkit implementations should override this method if the
1080      * <b>Control</b> key isn't the correct key for accelerators.
1081      * @return    the modifier mask on the {@code Event} class
1082      *                 that is used for menu shortcuts on this toolkit.
1083      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1084      * returns true
1085      * @see       java.awt.GraphicsEnvironment#isHeadless
1086      * @see       java.awt.MenuBar
1087      * @see       java.awt.MenuShortcut
1088      * @deprecated It is recommended that extended modifier keys and
1089      *             {@link #getMenuShortcutKeyMaskEx()} be used instead
1090      * @since     1.1
1091      */
1092     @Deprecated(since = "10")
1093     public int getMenuShortcutKeyMask() throws HeadlessException {
1094         GraphicsEnvironment.checkHeadless();
1095 
1096         return Event.CTRL_MASK;
1097     }
1098 
1099     /**
1100      * Determines which extended modifier key is the appropriate accelerator
1101      * key for menu shortcuts.
1102      * <p>
1103      * Menu shortcuts, which are embodied in the {@code MenuShortcut} class, are
1104      * handled by the {@code MenuBar} class.
1105      * <p>
1106      * By default, this method returns {@code InputEvent.CTRL_DOWN_MASK}.
1107      * Toolkit implementations should override this method if the
1108      * <b>Control</b> key isn't the correct key for accelerators.
1109      *
1110      * @return the modifier mask on the {@code InputEvent} class that is used
1111      *         for menu shortcuts on this toolkit
1112      * @throws HeadlessException if GraphicsEnvironment.isHeadless() returns
1113      *         true
1114      * @see java.awt.GraphicsEnvironment#isHeadless
1115      * @see java.awt.MenuBar
1116      * @see java.awt.MenuShortcut
1117      * @since 10
1118      */
1119     public int getMenuShortcutKeyMaskEx() throws HeadlessException {
1120         GraphicsEnvironment.checkHeadless();
1121 
1122         return InputEvent.CTRL_DOWN_MASK;
1123     }
1124 
1125     /**
1126      * Returns whether the given locking key on the keyboard is currently in
1127      * its "on" state.
1128      * Valid key codes are
1129      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1130      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1131      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1132      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1133      *
1134      * @param  keyCode the key code
1135      * @return {@code true} if the given key is currently in its "on" state;
1136      *          otherwise {@code false}
1137      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1138      * is not one of the valid key codes
1139      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1140      * allow getting the state of this key programmatically, or if the keyboard
1141      * doesn't have this key
1142      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1143      * returns true
1144      * @see       java.awt.GraphicsEnvironment#isHeadless
1145      * @since 1.3
1146      */
1147     public boolean getLockingKeyState(int keyCode)
1148         throws UnsupportedOperationException
1149     {
1150         GraphicsEnvironment.checkHeadless();
1151 
1152         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1153                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1154             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1155         }
1156         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1157     }
1158 
1159     /**
1160      * Sets the state of the given locking key on the keyboard.
1161      * Valid key codes are
1162      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1163      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1164      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1165      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1166      * <p>
1167      * Depending on the platform, setting the state of a locking key may
1168      * involve event processing and therefore may not be immediately
1169      * observable through getLockingKeyState.
1170      *
1171      * @param  keyCode the key code
1172      * @param  on the state of the key
1173      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1174      * is not one of the valid key codes
1175      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1176      * allow setting the state of this key programmatically, or if the keyboard
1177      * doesn't have this key
1178      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1179      * returns true
1180      * @see       java.awt.GraphicsEnvironment#isHeadless
1181      * @since 1.3
1182      */
1183     public void setLockingKeyState(int keyCode, boolean on)
1184         throws UnsupportedOperationException
1185     {
1186         GraphicsEnvironment.checkHeadless();
1187 
1188         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1189                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1190             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1191         }
1192         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1193     }
1194 
1195     /**
1196      * Give native peers the ability to query the native container
1197      * given a native component (eg the direct parent may be lightweight).
1198      *
1199      * @param  c the component to fetch the container for
1200      * @return the native container object for the component
1201      */
1202     protected static Container getNativeContainer(Component c) {
1203         return c.getNativeContainer();
1204     }
1205 
1206     /**
1207      * Creates a new custom cursor object.
1208      * If the image to display is invalid, the cursor will be hidden (made
1209      * completely transparent), and the hotspot will be set to (0, 0).
1210      *
1211      * <p>Note that multi-frame images are invalid and may cause this
1212      * method to hang.
1213      *
1214      * @param cursor the image to display when the cursor is activated
1215      * @param hotSpot the X and Y of the large cursor's hot spot; the
1216      *   hotSpot values must be less than the Dimension returned by
1217      *   {@code getBestCursorSize}
1218      * @param     name a localized description of the cursor, for Java Accessibility use
1219      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1220      *   the bounds of the cursor
1221      * @return the cursor created
1222      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1223      * returns true
1224      * @see       java.awt.GraphicsEnvironment#isHeadless
1225      * @since     1.2
1226      */
1227     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1228         throws IndexOutOfBoundsException, HeadlessException
1229     {
1230         // Override to implement custom cursor support.
1231         if (this != Toolkit.getDefaultToolkit()) {
1232             return Toolkit.getDefaultToolkit().
1233                 createCustomCursor(cursor, hotSpot, name);
1234         } else {
1235             return new Cursor(Cursor.DEFAULT_CURSOR);
1236         }
1237     }
1238 
1239     /**
1240      * Returns the supported cursor dimension which is closest to the desired
1241      * sizes.  Systems which only support a single cursor size will return that
1242      * size regardless of the desired sizes.  Systems which don't support custom
1243      * cursors will return a dimension of 0, 0. <p>
1244      * Note:  if an image is used whose dimensions don't match a supported size
1245      * (as returned by this method), the Toolkit implementation will attempt to
1246      * resize the image to a supported size.
1247      * Since converting low-resolution images is difficult,
1248      * no guarantees are made as to the quality of a cursor image which isn't a
1249      * supported size.  It is therefore recommended that this method
1250      * be called and an appropriate image used so no image conversion is made.
1251      *
1252      * @param     preferredWidth the preferred cursor width the component would like
1253      * to use.
1254      * @param     preferredHeight the preferred cursor height the component would like
1255      * to use.
1256      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1257      * the Toolkit implementation doesn't support custom cursors.
1258      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1259      * returns true
1260      * @see       java.awt.GraphicsEnvironment#isHeadless
1261      * @since     1.2
1262      */
1263     public Dimension getBestCursorSize(int preferredWidth,
1264         int preferredHeight) throws HeadlessException {
1265         GraphicsEnvironment.checkHeadless();
1266 
1267         // Override to implement custom cursor support.
1268         if (this != Toolkit.getDefaultToolkit()) {
1269             return Toolkit.getDefaultToolkit().
1270                 getBestCursorSize(preferredWidth, preferredHeight);
1271         } else {
1272             return new Dimension(0, 0);
1273         }
1274     }
1275 
1276     /**
1277      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1278      * palette.<p>
1279      * Note: if an image is used which has more colors in its palette than
1280      * the supported maximum, the Toolkit implementation will attempt to flatten the
1281      * palette to the maximum.  Since converting low-resolution images is difficult,
1282      * no guarantees are made as to the quality of a cursor image which has more
1283      * colors than the system supports.  It is therefore recommended that this method
1284      * be called and an appropriate image used so no image conversion is made.
1285      *
1286      * @return    the maximum number of colors, or zero if custom cursors are not
1287      * supported by this Toolkit implementation.
1288      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1289      * returns true
1290      * @see       java.awt.GraphicsEnvironment#isHeadless
1291      * @since     1.2
1292      */
1293     public int getMaximumCursorColors() throws HeadlessException {
1294         GraphicsEnvironment.checkHeadless();
1295 
1296         // Override to implement custom cursor support.
1297         if (this != Toolkit.getDefaultToolkit()) {
1298             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1299         } else {
1300             return 0;
1301         }
1302     }
1303 
1304     /**
1305      * Returns whether Toolkit supports this state for
1306      * {@code Frame}s.  This method tells whether the <em>UI
1307      * concept</em> of, say, maximization or iconification is
1308      * supported.  It will always return false for "compound" states
1309      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1310      * In other words, the rule of thumb is that only queries with a
1311      * single frame state constant as an argument are meaningful.
1312      * <p>Note that supporting a given concept is a platform-
1313      * dependent feature. Due to native limitations the Toolkit
1314      * object may report a particular state as supported, however at
1315      * the same time the Toolkit object will be unable to apply the
1316      * state to a given frame.  This circumstance has two following
1317      * consequences:
1318      * <ul>
1319      * <li>Only the return value of {@code false} for the present
1320      * method actually indicates that the given state is not
1321      * supported. If the method returns {@code true} the given state
1322      * may still be unsupported and/or unavailable for a particular
1323      * frame.
1324      * <li>The developer should consider examining the value of the
1325      * {@link java.awt.event.WindowEvent#getNewState} method of the
1326      * {@code WindowEvent} received through the {@link
1327      * java.awt.event.WindowStateListener}, rather than assuming
1328      * that the state given to the {@code setExtendedState()} method
1329      * will be definitely applied. For more information see the
1330      * documentation for the {@link Frame#setExtendedState} method.
1331      * </ul>
1332      *
1333      * @param state one of named frame state constants.
1334      * @return {@code true} is this frame state is supported by
1335      *     this Toolkit implementation, {@code false} otherwise.
1336      * @exception HeadlessException
1337      *     if {@code GraphicsEnvironment.isHeadless()}
1338      *     returns {@code true}.
1339      * @see java.awt.Window#addWindowStateListener
1340      * @since   1.4
1341      */
1342     public boolean isFrameStateSupported(int state)
1343         throws HeadlessException
1344     {
1345         GraphicsEnvironment.checkHeadless();
1346 
1347         if (this != Toolkit.getDefaultToolkit()) {
1348             return Toolkit.getDefaultToolkit().
1349                 isFrameStateSupported(state);
1350         } else {
1351             return (state == Frame.NORMAL); // others are not guaranteed
1352         }
1353     }
1354 
1355     /**
1356      * Support for I18N: any visible strings should be stored in
1357      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1358      * here, so that only one copy is maintained.
1359      */
1360     private static ResourceBundle resources;
1361     private static ResourceBundle platformResources;
1362 
1363     // called by platform toolkit
1364     private static void setPlatformResources(ResourceBundle bundle) {
1365         platformResources = bundle;
1366     }
1367 
1368     /**
1369      * Initialize JNI field and method ids
1370      */
1371     private static native void initIDs();
1372 
1373     /**
1374      * WARNING: This is a temporary workaround for a problem in the
1375      * way the AWT loads native libraries. A number of classes in the
1376      * AWT package have a native method, initIDs(), which initializes
1377      * the JNI field and method ids used in the native portion of
1378      * their implementation.
1379      *
1380      * Since the use and storage of these ids is done by the
1381      * implementation libraries, the implementation of these method is
1382      * provided by the particular AWT implementations (for example,
1383      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1384      * problem is that this means that the native libraries must be
1385      * loaded by the java.* classes, which do not necessarily know the
1386      * names of the libraries to load. A better way of doing this
1387      * would be to provide a separate library which defines java.awt.*
1388      * initIDs, and exports the relevant symbols out to the
1389      * implementation libraries.
1390      *
1391      * For now, we know it's done by the implementation, and we assume
1392      * that the name of the library is "awt".  -br.
1393      *
1394      * If you change loadLibraries(), please add the change to
1395      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1396      * classes can be loaded in java.awt.image that depend on
1397      * libawt and there is no way to call Toolkit.loadLibraries()
1398      * directly.  -hung
1399      */
1400     private static boolean loaded = false;
1401     static void loadLibraries() {
1402         if (!loaded) {
1403             java.security.AccessController.doPrivileged(
1404                 new java.security.PrivilegedAction<Void>() {
1405                     public Void run() {
1406                         System.loadLibrary("awt");
1407                         return null;
1408                     }
1409                 });
1410             loaded = true;
1411         }
1412     }
1413 
1414     static {
1415         AWTAccessor.setToolkitAccessor(
1416                 new AWTAccessor.ToolkitAccessor() {
1417                     @Override
1418                     public void setPlatformResources(ResourceBundle bundle) {
1419                         Toolkit.setPlatformResources(bundle);
1420                     }
1421                 });
1422 
1423         java.security.AccessController.doPrivileged(
1424                                  new java.security.PrivilegedAction<Void>() {
1425             public Void run() {
1426                 try {
1427                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1428                 } catch (MissingResourceException e) {
1429                     // No resource file; defaults will be used.
1430                 }
1431                 return null;
1432             }
1433         });
1434 
1435         // ensure that the proper libraries are loaded
1436         loadLibraries();
1437         initAssistiveTechnologies();
1438         initIDs();
1439     }
1440 
1441     /**
1442      * Gets a property with the specified key and default.
1443      * This method returns defaultValue if the property is not found.
1444      *
1445      * @param  key the key
1446      * @param  defaultValue the default value
1447      * @return the value of the property or the default value
1448      *         if the property was not found
1449      */
1450     public static String getProperty(String key, String defaultValue) {
1451         // first try platform specific bundle
1452         if (platformResources != null) {
1453             try {
1454                 return platformResources.getString(key);
1455             }
1456             catch (MissingResourceException e) {}
1457         }
1458 
1459         // then shared one
1460         if (resources != null) {
1461             try {
1462                 return resources.getString(key);
1463             }
1464             catch (MissingResourceException e) {}
1465         }
1466 
1467         return defaultValue;
1468     }
1469 
1470     /**
1471      * Get the application's or applet's EventQueue instance.
1472      * Depending on the Toolkit implementation, different EventQueues
1473      * may be returned for different applets.  Applets should
1474      * therefore not assume that the EventQueue instance returned
1475      * by this method will be shared by other applets or the system.
1476      *
1477      * <p> If there is a security manager then its
1478      * {@link SecurityManager#checkPermission checkPermission} method
1479      * is called to check {@code AWTPermission("accessEventQueue")}.
1480      *
1481      * @return    the {@code EventQueue} object
1482      * @throws  SecurityException
1483      *          if a security manager is set and it denies access to
1484      *          the {@code EventQueue}
1485      * @see     java.awt.AWTPermission
1486     */
1487     public final EventQueue getSystemEventQueue() {
1488         SecurityManager security = System.getSecurityManager();
1489         if (security != null) {
1490             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1491         }
1492         return getSystemEventQueueImpl();
1493     }
1494 
1495     /**
1496      * Gets the application's or applet's {@code EventQueue}
1497      * instance, without checking access.  For security reasons,
1498      * this can only be called from a {@code Toolkit} subclass.
1499      * @return the {@code EventQueue} object
1500      */
1501     protected abstract EventQueue getSystemEventQueueImpl();
1502 
1503     /* Accessor method for use by AWT package routines. */
1504     static EventQueue getEventQueue() {
1505         return getDefaultToolkit().getSystemEventQueueImpl();
1506     }
1507 
1508     /**
1509      * Creates a concrete, platform dependent, subclass of the abstract
1510      * DragGestureRecognizer class requested, and associates it with the
1511      * DragSource, Component and DragGestureListener specified.
1512      *
1513      * subclasses should override this to provide their own implementation
1514      *
1515      * @param <T> the type of DragGestureRecognizer to create
1516      * @param abstractRecognizerClass The abstract class of the required recognizer
1517      * @param ds                      The DragSource
1518      * @param c                       The Component target for the DragGestureRecognizer
1519      * @param srcActions              The actions permitted for the gesture
1520      * @param dgl                     The DragGestureListener
1521      *
1522      * @return the new object or null.  Always returns null if
1523      * GraphicsEnvironment.isHeadless() returns true.
1524      * @see java.awt.GraphicsEnvironment#isHeadless
1525      */
1526     public <T extends DragGestureRecognizer> T
1527         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1528                                     DragSource ds, Component c, int srcActions,
1529                                     DragGestureListener dgl)
1530     {
1531         return null;
1532     }
1533 
1534     /**
1535      * Obtains a value for the specified desktop property.
1536      *
1537      * A desktop property is a uniquely named value for a resource that
1538      * is Toolkit global in nature. Usually it also is an abstract
1539      * representation for an underlying platform dependent desktop setting.
1540      * For more information on desktop properties supported by the AWT see
1541      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1542      *
1543      * @param  propertyName the property name
1544      * @return the value for the specified desktop property
1545      */
1546     public final synchronized Object getDesktopProperty(String propertyName) {
1547         // This is a workaround for headless toolkits.  It would be
1548         // better to override this method but it is declared final.
1549         // "this instanceof" syntax defeats polymorphism.
1550         // --mm, 03/03/00
1551         if (this instanceof HeadlessToolkit) {
1552             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1553                 .getDesktopProperty(propertyName);
1554         }
1555 
1556         if (desktopProperties.isEmpty()) {
1557             initializeDesktopProperties();
1558         }
1559 
1560         Object value;
1561 
1562         // This property should never be cached
1563         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1564             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1565         }
1566 
1567         value = desktopProperties.get(propertyName);
1568 
1569         if (value == null) {
1570             value = lazilyLoadDesktopProperty(propertyName);
1571 
1572             if (value != null) {
1573                 setDesktopProperty(propertyName, value);
1574             }
1575         }
1576 
1577         /* for property "awt.font.desktophints" */
1578         if (value instanceof RenderingHints) {
1579             value = ((RenderingHints)value).clone();
1580         }
1581 
1582         return value;
1583     }
1584 
1585     /**
1586      * Sets the named desktop property to the specified value and fires a
1587      * property change event to notify any listeners that the value has changed.
1588      *
1589      * @param  name the property name
1590      * @param  newValue the new property value
1591      */
1592     protected final void setDesktopProperty(String name, Object newValue) {
1593         // This is a workaround for headless toolkits.  It would be
1594         // better to override this method but it is declared final.
1595         // "this instanceof" syntax defeats polymorphism.
1596         // --mm, 03/03/00
1597         if (this instanceof HeadlessToolkit) {
1598             ((HeadlessToolkit)this).getUnderlyingToolkit()
1599                 .setDesktopProperty(name, newValue);
1600             return;
1601         }
1602         Object oldValue;
1603 
1604         synchronized (this) {
1605             oldValue = desktopProperties.get(name);
1606             desktopProperties.put(name, newValue);
1607         }
1608 
1609         // Don't fire change event if old and new values are null.
1610         // It helps to avoid recursive resending of WM_THEMECHANGED
1611         if (oldValue != null || newValue != null) {
1612             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1613         }
1614     }
1615 
1616     /**
1617      * An opportunity to lazily evaluate desktop property values.
1618      * @return the desktop property or null
1619      * @param name the name
1620      */
1621     protected Object lazilyLoadDesktopProperty(String name) {
1622         return null;
1623     }
1624 
1625     /**
1626      * initializeDesktopProperties
1627      */
1628     protected void initializeDesktopProperties() {
1629     }
1630 
1631     /**
1632      * Adds the specified property change listener for the named desktop
1633      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1634      * its property name is ignored, and the wrapped listener is added.
1635      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1636      * no exception is thrown and no action is performed.
1637      *
1638      * @param   name The name of the property to listen for
1639      * @param   pcl The property change listener
1640      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1641                 PropertyChangeListener)
1642      * @since   1.2
1643      */
1644     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1645         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1646     }
1647 
1648     /**
1649      * Removes the specified property change listener for the named
1650      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1651      * is removed, its property name is ignored, and
1652      * the wrapped listener is removed.
1653      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1654      * no exception is thrown and no action is performed.
1655      *
1656      * @param   name The name of the property to remove
1657      * @param   pcl The property change listener
1658      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1659                 PropertyChangeListener)
1660      * @since   1.2
1661      */
1662     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1663         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1664     }
1665 
1666     /**
1667      * Returns an array of all the property change listeners
1668      * registered on this toolkit. The returned array
1669      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1670      * that associate listeners with the names of desktop properties.
1671      *
1672      * @return all of this toolkit's {@link PropertyChangeListener}
1673      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1674      *         or an empty array  if no listeners are added
1675      *
1676      * @see PropertyChangeSupport#getPropertyChangeListeners()
1677      * @since 1.4
1678      */
1679     public PropertyChangeListener[] getPropertyChangeListeners() {
1680         return desktopPropsSupport.getPropertyChangeListeners();
1681     }
1682 
1683     /**
1684      * Returns an array of all property change listeners
1685      * associated with the specified name of a desktop property.
1686      *
1687      * @param  propertyName the named property
1688      * @return all of the {@code PropertyChangeListener} objects
1689      *         associated with the specified name of a desktop property
1690      *         or an empty array if no such listeners are added
1691      *
1692      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1693      * @since 1.4
1694      */
1695     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1696         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1697     }
1698 
1699     /**
1700      * The desktop properties.
1701      */
1702     protected final Map<String,Object> desktopProperties =
1703             new HashMap<String,Object>();
1704     /**
1705      * The desktop properties change support.
1706      */
1707     protected final PropertyChangeSupport desktopPropsSupport =
1708             Toolkit.createPropertyChangeSupport(this);
1709 
1710     /**
1711      * Returns whether the always-on-top mode is supported by this toolkit.
1712      * To detect whether the always-on-top mode is supported for a
1713      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1714      * @return {@code true}, if current toolkit supports the always-on-top mode,
1715      *     otherwise returns {@code false}
1716      * @see Window#isAlwaysOnTopSupported
1717      * @see Window#setAlwaysOnTop(boolean)
1718      * @since 1.6
1719      */
1720     public boolean isAlwaysOnTopSupported() {
1721         return true;
1722     }
1723 
1724     /**
1725      * Returns whether the given modality type is supported by this toolkit. If
1726      * a dialog with unsupported modality type is created, then
1727      * {@code Dialog.ModalityType.MODELESS} is used instead.
1728      *
1729      * @param modalityType modality type to be checked for support by this toolkit
1730      *
1731      * @return {@code true}, if current toolkit supports given modality
1732      *     type, {@code false} otherwise
1733      *
1734      * @see java.awt.Dialog.ModalityType
1735      * @see java.awt.Dialog#getModalityType
1736      * @see java.awt.Dialog#setModalityType
1737      *
1738      * @since 1.6
1739      */
1740     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1741 
1742     /**
1743      * Returns whether the given modal exclusion type is supported by this
1744      * toolkit. If an unsupported modal exclusion type property is set on a window,
1745      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1746      *
1747      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1748      *
1749      * @return {@code true}, if current toolkit supports given modal exclusion
1750      *     type, {@code false} otherwise
1751      *
1752      * @see java.awt.Dialog.ModalExclusionType
1753      * @see java.awt.Window#getModalExclusionType
1754      * @see java.awt.Window#setModalExclusionType
1755      *
1756      * @since 1.6
1757      */
1758     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1759 
1760     // 8014718: logging has been removed from SunToolkit
1761 
1762     private static final int LONG_BITS = 64;
1763     private int[] calls = new int[LONG_BITS];
1764     private static volatile long enabledOnToolkitMask;
1765     private AWTEventListener eventListener = null;
1766     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1767 
1768     /*
1769      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1770      * if the listener is proxied.
1771      */
1772     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1773     {
1774         AWTEventListener localL = l;
1775 
1776         if (localL == null) {
1777             return null;
1778         }
1779         // if user passed in a AWTEventListenerProxy object, extract
1780         // the listener
1781         if (l instanceof AWTEventListenerProxy) {
1782             localL = ((AWTEventListenerProxy)l).getListener();
1783         }
1784         return localL;
1785     }
1786 
1787     /**
1788      * Adds an AWTEventListener to receive all AWTEvents dispatched
1789      * system-wide that conform to the given {@code eventMask}.
1790      * <p>
1791      * First, if there is a security manager, its {@code checkPermission}
1792      * method is called with an
1793      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1794      * This may result in a SecurityException.
1795      * <p>
1796      * {@code eventMask} is a bitmask of event types to receive.
1797      * It is constructed by bitwise OR-ing together the event masks
1798      * defined in {@code AWTEvent}.
1799      * <p>
1800      * Note:  event listener use is not recommended for normal
1801      * application use, but are intended solely to support special
1802      * purpose facilities including support for accessibility,
1803      * event record/playback, and diagnostic tracing.
1804      *
1805      * If listener is null, no exception is thrown and no action is performed.
1806      *
1807      * @param    listener   the event listener.
1808      * @param    eventMask  the bitmask of event types to receive
1809      * @throws SecurityException
1810      *        if a security manager exists and its
1811      *        {@code checkPermission} method doesn't allow the operation.
1812      * @see      #removeAWTEventListener
1813      * @see      #getAWTEventListeners
1814      * @see      SecurityManager#checkPermission
1815      * @see      java.awt.AWTEvent
1816      * @see      java.awt.AWTPermission
1817      * @see      java.awt.event.AWTEventListener
1818      * @see      java.awt.event.AWTEventListenerProxy
1819      * @since    1.2
1820      */
1821     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1822         AWTEventListener localL = deProxyAWTEventListener(listener);
1823 
1824         if (localL == null) {
1825             return;
1826         }
1827         SecurityManager security = System.getSecurityManager();
1828         if (security != null) {
1829           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1830         }
1831         synchronized (this) {
1832             SelectiveAWTEventListener selectiveListener =
1833                 listener2SelectiveListener.get(localL);
1834 
1835             if (selectiveListener == null) {
1836                 // Create a new selectiveListener.
1837                 selectiveListener = new SelectiveAWTEventListener(localL,
1838                                                                  eventMask);
1839                 listener2SelectiveListener.put(localL, selectiveListener);
1840                 eventListener = ToolkitEventMulticaster.add(eventListener,
1841                                                             selectiveListener);
1842             }
1843             // OR the eventMask into the selectiveListener's event mask.
1844             selectiveListener.orEventMasks(eventMask);
1845 
1846             enabledOnToolkitMask |= eventMask;
1847 
1848             long mask = eventMask;
1849             for (int i=0; i<LONG_BITS; i++) {
1850                 // If no bits are set, break out of loop.
1851                 if (mask == 0) {
1852                     break;
1853                 }
1854                 if ((mask & 1L) != 0) {  // Always test bit 0.
1855                     calls[i]++;
1856                 }
1857                 mask >>>= 1;  // Right shift, fill with zeros on left.
1858             }
1859         }
1860     }
1861 
1862     /**
1863      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1864      * <p>
1865      * First, if there is a security manager, its {@code checkPermission}
1866      * method is called with an
1867      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1868      * This may result in a SecurityException.
1869      * <p>
1870      * Note:  event listener use is not recommended for normal
1871      * application use, but are intended solely to support special
1872      * purpose facilities including support for accessibility,
1873      * event record/playback, and diagnostic tracing.
1874      *
1875      * If listener is null, no exception is thrown and no action is performed.
1876      *
1877      * @param    listener   the event listener.
1878      * @throws SecurityException
1879      *        if a security manager exists and its
1880      *        {@code checkPermission} method doesn't allow the operation.
1881      * @see      #addAWTEventListener
1882      * @see      #getAWTEventListeners
1883      * @see      SecurityManager#checkPermission
1884      * @see      java.awt.AWTEvent
1885      * @see      java.awt.AWTPermission
1886      * @see      java.awt.event.AWTEventListener
1887      * @see      java.awt.event.AWTEventListenerProxy
1888      * @since    1.2
1889      */
1890     public void removeAWTEventListener(AWTEventListener listener) {
1891         AWTEventListener localL = deProxyAWTEventListener(listener);
1892 
1893         if (listener == null) {
1894             return;
1895         }
1896         SecurityManager security = System.getSecurityManager();
1897         if (security != null) {
1898             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1899         }
1900 
1901         synchronized (this) {
1902             SelectiveAWTEventListener selectiveListener =
1903                 listener2SelectiveListener.get(localL);
1904 
1905             if (selectiveListener != null) {
1906                 listener2SelectiveListener.remove(localL);
1907                 int[] listenerCalls = selectiveListener.getCalls();
1908                 for (int i=0; i<LONG_BITS; i++) {
1909                     calls[i] -= listenerCalls[i];
1910                     assert calls[i] >= 0: "Negative Listeners count";
1911 
1912                     if (calls[i] == 0) {
1913                         enabledOnToolkitMask &= ~(1L<<i);
1914                     }
1915                 }
1916             }
1917             eventListener = ToolkitEventMulticaster.remove(eventListener,
1918             (selectiveListener == null) ? localL : selectiveListener);
1919         }
1920     }
1921 
1922     static boolean enabledOnToolkit(long eventMask) {
1923         return (enabledOnToolkitMask & eventMask) != 0;
1924         }
1925 
1926     synchronized int countAWTEventListeners(long eventMask) {
1927         int ci = 0;
1928         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1929         }
1930         ci--;
1931         return calls[ci];
1932     }
1933     /**
1934      * Returns an array of all the {@code AWTEventListener}s
1935      * registered on this toolkit.
1936      * If there is a security manager, its {@code checkPermission}
1937      * method is called with an
1938      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1939      * This may result in a SecurityException.
1940      * Listeners can be returned
1941      * within {@code AWTEventListenerProxy} objects, which also contain
1942      * the event mask for the given listener.
1943      * Note that listener objects
1944      * added multiple times appear only once in the returned array.
1945      *
1946      * @return all of the {@code AWTEventListener}s or an empty
1947      *         array if no listeners are currently registered
1948      * @throws SecurityException
1949      *        if a security manager exists and its
1950      *        {@code checkPermission} method doesn't allow the operation.
1951      * @see      #addAWTEventListener
1952      * @see      #removeAWTEventListener
1953      * @see      SecurityManager#checkPermission
1954      * @see      java.awt.AWTEvent
1955      * @see      java.awt.AWTPermission
1956      * @see      java.awt.event.AWTEventListener
1957      * @see      java.awt.event.AWTEventListenerProxy
1958      * @since 1.4
1959      */
1960     public AWTEventListener[] getAWTEventListeners() {
1961         SecurityManager security = System.getSecurityManager();
1962         if (security != null) {
1963             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1964         }
1965         synchronized (this) {
1966             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1967 
1968             AWTEventListener[] ret = new AWTEventListener[la.length];
1969             for (int i = 0; i < la.length; i++) {
1970                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1971                 AWTEventListener tempL = sael.getListener();
1972                 //assert tempL is not an AWTEventListenerProxy - we should
1973                 // have weeded them all out
1974                 // don't want to wrap a proxy inside a proxy
1975                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1976             }
1977             return ret;
1978         }
1979     }
1980 
1981     /**
1982      * Returns an array of all the {@code AWTEventListener}s
1983      * registered on this toolkit which listen to all of the event
1984      * types specified in the {@code eventMask} argument.
1985      * If there is a security manager, its {@code checkPermission}
1986      * method is called with an
1987      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1988      * This may result in a SecurityException.
1989      * Listeners can be returned
1990      * within {@code AWTEventListenerProxy} objects, which also contain
1991      * the event mask for the given listener.
1992      * Note that listener objects
1993      * added multiple times appear only once in the returned array.
1994      *
1995      * @param  eventMask the bitmask of event types to listen for
1996      * @return all of the {@code AWTEventListener}s registered
1997      *         on this toolkit for the specified
1998      *         event types, or an empty array if no such listeners
1999      *         are currently registered
2000      * @throws SecurityException
2001      *        if a security manager exists and its
2002      *        {@code checkPermission} method doesn't allow the operation.
2003      * @see      #addAWTEventListener
2004      * @see      #removeAWTEventListener
2005      * @see      SecurityManager#checkPermission
2006      * @see      java.awt.AWTEvent
2007      * @see      java.awt.AWTPermission
2008      * @see      java.awt.event.AWTEventListener
2009      * @see      java.awt.event.AWTEventListenerProxy
2010      * @since 1.4
2011      */
2012     public AWTEventListener[] getAWTEventListeners(long eventMask) {
2013         SecurityManager security = System.getSecurityManager();
2014         if (security != null) {
2015             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
2016         }
2017         synchronized (this) {
2018             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
2019 
2020             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
2021 
2022             for (int i = 0; i < la.length; i++) {
2023                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2024                 if ((sael.getEventMask() & eventMask) == eventMask) {
2025                     //AWTEventListener tempL = sael.getListener();
2026                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
2027                                                        sael.getListener()));
2028                 }
2029             }
2030             return list.toArray(new AWTEventListener[0]);
2031         }
2032     }
2033 
2034     /*
2035      * This method notifies any AWTEventListeners that an event
2036      * is about to be dispatched.
2037      *
2038      * @param theEvent the event which will be dispatched.
2039      */
2040     void notifyAWTEventListeners(AWTEvent theEvent) {
2041         // This is a workaround for headless toolkits.  It would be
2042         // better to override this method but it is declared package private.
2043         // "this instanceof" syntax defeats polymorphism.
2044         // --mm, 03/03/00
2045         if (this instanceof HeadlessToolkit) {
2046             ((HeadlessToolkit)this).getUnderlyingToolkit()
2047                 .notifyAWTEventListeners(theEvent);
2048             return;
2049         }
2050 
2051         AWTEventListener eventListener = this.eventListener;
2052         if (eventListener != null) {
2053             eventListener.eventDispatched(theEvent);
2054         }
2055     }
2056 
2057     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2058         implements AWTEventListener {
2059         // Implementation cloned from AWTEventMulticaster.
2060 
2061         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2062             super(a, b);
2063         }
2064 
2065         @SuppressWarnings("overloads")
2066         static AWTEventListener add(AWTEventListener a,
2067                                     AWTEventListener b) {
2068             if (a == null)  return b;
2069             if (b == null)  return a;
2070             return new ToolkitEventMulticaster(a, b);
2071         }
2072 
2073         @SuppressWarnings("overloads")
2074         static AWTEventListener remove(AWTEventListener l,
2075                                        AWTEventListener oldl) {
2076             return (AWTEventListener) removeInternal(l, oldl);
2077         }
2078 
2079         // #4178589: must overload remove(EventListener) to call our add()
2080         // instead of the static addInternal() so we allocate a
2081         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2082         // Note: this method is called by AWTEventListener.removeInternal(),
2083         // so its method signature must match AWTEventListener.remove().
2084         protected EventListener remove(EventListener oldl) {
2085             if (oldl == a)  return b;
2086             if (oldl == b)  return a;
2087             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2088             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2089             if (a2 == a && b2 == b) {
2090                 return this;    // it's not here
2091             }
2092             return add(a2, b2);
2093         }
2094 
2095         public void eventDispatched(AWTEvent event) {
2096             ((AWTEventListener)a).eventDispatched(event);
2097             ((AWTEventListener)b).eventDispatched(event);
2098         }
2099     }
2100 
2101     private class SelectiveAWTEventListener implements AWTEventListener {
2102         AWTEventListener listener;
2103         private long eventMask;
2104         // This array contains the number of times to call the eventlistener
2105         // for each event type.
2106         int[] calls = new int[Toolkit.LONG_BITS];
2107 
2108         public AWTEventListener getListener() {return listener;}
2109         public long getEventMask() {return eventMask;}
2110         public int[] getCalls() {return calls;}
2111 
2112         public void orEventMasks(long mask) {
2113             eventMask |= mask;
2114             // For each event bit set in mask, increment its call count.
2115             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2116                 // If no bits are set, break out of loop.
2117                 if (mask == 0) {
2118                     break;
2119                 }
2120                 if ((mask & 1L) != 0) {  // Always test bit 0.
2121                     calls[i]++;
2122                 }
2123                 mask >>>= 1;  // Right shift, fill with zeros on left.
2124             }
2125         }
2126 
2127         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2128             listener = l;
2129             eventMask = mask;
2130         }
2131 
2132         public void eventDispatched(AWTEvent event) {
2133             long eventBit = 0; // Used to save the bit of the event type.
2134             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2135                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2136                  event.id <= ComponentEvent.COMPONENT_LAST)
2137              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2138                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2139                  event.id <= ContainerEvent.CONTAINER_LAST)
2140              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2141                  event.id >= FocusEvent.FOCUS_FIRST &&
2142                  event.id <= FocusEvent.FOCUS_LAST)
2143              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2144                  event.id >= KeyEvent.KEY_FIRST &&
2145                  event.id <= KeyEvent.KEY_LAST)
2146              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2147                  event.id == MouseEvent.MOUSE_WHEEL)
2148              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2149                  (event.id == MouseEvent.MOUSE_MOVED ||
2150                   event.id == MouseEvent.MOUSE_DRAGGED))
2151              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2152                  event.id != MouseEvent.MOUSE_MOVED &&
2153                  event.id != MouseEvent.MOUSE_DRAGGED &&
2154                  event.id != MouseEvent.MOUSE_WHEEL &&
2155                  event.id >= MouseEvent.MOUSE_FIRST &&
2156                  event.id <= MouseEvent.MOUSE_LAST)
2157              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2158                  (event.id >= WindowEvent.WINDOW_FIRST &&
2159                  event.id <= WindowEvent.WINDOW_LAST))
2160              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2161                  event.id >= ActionEvent.ACTION_FIRST &&
2162                  event.id <= ActionEvent.ACTION_LAST)
2163              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2164                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2165                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2166              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2167                  event.id >= ItemEvent.ITEM_FIRST &&
2168                  event.id <= ItemEvent.ITEM_LAST)
2169              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2170                  event.id >= TextEvent.TEXT_FIRST &&
2171                  event.id <= TextEvent.TEXT_LAST)
2172              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2173                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2174                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2175              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2176                  event.id >= PaintEvent.PAINT_FIRST &&
2177                  event.id <= PaintEvent.PAINT_LAST)
2178              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2179                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2180                  event.id <= InvocationEvent.INVOCATION_LAST)
2181              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2182                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2183              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2184                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2185                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2186              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2187                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2188              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2189                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2190                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2191                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2192                     (event instanceof sun.awt.UngrabEvent))) {
2193                 // Get the index of the call count for this event type.
2194                 // Instead of using Math.log(...) we will calculate it with
2195                 // bit shifts. That's what previous implementation looked like:
2196                 //
2197                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2198                 int ci = 0;
2199                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2200                 }
2201                 ci--;
2202                 // Call the listener as many times as it was added for this
2203                 // event type.
2204                 for (int i=0; i<calls[ci]; i++) {
2205                     listener.eventDispatched(event);
2206                 }
2207             }
2208         }
2209     }
2210 
2211     /**
2212      * Returns a map of visual attributes for the abstract level description
2213      * of the given input method highlight, or null if no mapping is found.
2214      * The style field of the input method highlight is ignored. The map
2215      * returned is unmodifiable.
2216      * @param highlight input method highlight
2217      * @return style attribute map, or {@code null}
2218      * @exception HeadlessException if
2219      *     {@code GraphicsEnvironment.isHeadless} returns true
2220      * @see       java.awt.GraphicsEnvironment#isHeadless
2221      * @since 1.3
2222      */
2223     public abstract Map<java.awt.font.TextAttribute,?>
2224         mapInputMethodHighlight(InputMethodHighlight highlight)
2225         throws HeadlessException;
2226 
2227     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2228         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2229             return new DesktopPropertyChangeSupport(toolkit);
2230         } else {
2231             return new PropertyChangeSupport(toolkit);
2232         }
2233     }
2234 
2235     @SuppressWarnings("serial")
2236     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2237 
2238         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2239                 new StringBuilder("desktop property change support key");
2240         private final Object source;
2241 
2242         public DesktopPropertyChangeSupport(Object sourceBean) {
2243             super(sourceBean);
2244             source = sourceBean;
2245         }
2246 
2247         @Override
2248         public synchronized void addPropertyChangeListener(
2249                 String propertyName,
2250                 PropertyChangeListener listener)
2251         {
2252             PropertyChangeSupport pcs = (PropertyChangeSupport)
2253                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2254             if (null == pcs) {
2255                 pcs = new PropertyChangeSupport(source);
2256                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2257             }
2258             pcs.addPropertyChangeListener(propertyName, listener);
2259         }
2260 
2261         @Override
2262         public synchronized void removePropertyChangeListener(
2263                 String propertyName,
2264                 PropertyChangeListener listener)
2265         {
2266             PropertyChangeSupport pcs = (PropertyChangeSupport)
2267                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2268             if (null != pcs) {
2269                 pcs.removePropertyChangeListener(propertyName, listener);
2270             }
2271         }
2272 
2273         @Override
2274         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2275         {
2276             PropertyChangeSupport pcs = (PropertyChangeSupport)
2277                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2278             if (null != pcs) {
2279                 return pcs.getPropertyChangeListeners();
2280             } else {
2281                 return new PropertyChangeListener[0];
2282             }
2283         }
2284 
2285         @Override
2286         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2287         {
2288             PropertyChangeSupport pcs = (PropertyChangeSupport)
2289                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2290             if (null != pcs) {
2291                 return pcs.getPropertyChangeListeners(propertyName);
2292             } else {
2293                 return new PropertyChangeListener[0];
2294             }
2295         }
2296 
2297         @Override
2298         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2299             PropertyChangeSupport pcs = (PropertyChangeSupport)
2300                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2301             if (null == pcs) {
2302                 pcs = new PropertyChangeSupport(source);
2303                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2304             }
2305             pcs.addPropertyChangeListener(listener);
2306         }
2307 
2308         @Override
2309         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2310             PropertyChangeSupport pcs = (PropertyChangeSupport)
2311                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2312             if (null != pcs) {
2313                 pcs.removePropertyChangeListener(listener);
2314             }
2315         }
2316 
2317         /*
2318          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2319          * use this method.  If this will be changed we will need to change this class.
2320          */
2321         @Override
2322         public void firePropertyChange(final PropertyChangeEvent evt) {
2323             Object oldValue = evt.getOldValue();
2324             Object newValue = evt.getNewValue();
2325             String propertyName = evt.getPropertyName();
2326             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2327                 return;
2328             }
2329             Runnable updater = new Runnable() {
2330                 public void run() {
2331                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2332                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2333                     if (null != pcs) {
2334                         pcs.firePropertyChange(evt);
2335                     }
2336                 }
2337             };
2338             final AppContext currentAppContext = AppContext.getAppContext();
2339             for (AppContext appContext : AppContext.getAppContexts()) {
2340                 if (null == appContext || appContext.isDisposed()) {
2341                     continue;
2342                 }
2343                 if (currentAppContext == appContext) {
2344                     updater.run();
2345                 } else {
2346                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2347                     SunToolkit.postEvent(appContext, e);
2348                 }
2349             }
2350         }
2351     }
2352 
2353     /**
2354     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2355     * {@code EventQueue}.
2356     * <br>
2357     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2358     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2359     * startup by the following command:
2360     * <pre>
2361     * java -Dsun.awt.enableExtraMouseButtons=false Application
2362     * </pre>
2363     * Alternatively, the property could be set in the application by using the following code:
2364     * <pre>
2365     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2366     * </pre>
2367     * before the {@code Toolkit} class initialization.
2368     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2369     * initialized with {@code true}.
2370     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2371     *
2372     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2373     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2374     *         {@code false} otherwise
2375     * @see System#getProperty(String propertyName)
2376     * @see System#setProperty(String propertyName, String value)
2377     * @see java.awt.EventQueue
2378     * @since 1.7
2379      */
2380     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2381         GraphicsEnvironment.checkHeadless();
2382 
2383         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2384     }
2385 }