1 /*
   2  * Copyright (c) 1995, 2020, 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.PlatformGraphicsInfo;
  82 import sun.awt.SunToolkit;
  83 
  84 /**
  85  * This class is the abstract superclass of all actual
  86  * implementations of the Abstract Window Toolkit. Subclasses of
  87  * the {@code Toolkit} class are used to bind the various components
  88  * to particular native toolkit implementations.
  89  * <p>
  90  * Many GUI events may be delivered to user
  91  * asynchronously, if the opposite is not specified explicitly.
  92  * As well as
  93  * many GUI operations may be performed asynchronously.
  94  * This fact means that if the state of a component is set, and then
  95  * the state immediately queried, the returned value may not yet
  96  * reflect the requested change.  This behavior includes, but is not
  97  * limited to:
  98  * <ul>
  99  * <li>Scrolling to a specified position.
 100  * <br>For example, calling {@code ScrollPane.setScrollPosition}
 101  *     and then {@code getScrollPosition} may return an incorrect
 102  *     value if the original request has not yet been processed.
 103  *
 104  * <li>Moving the focus from one component to another.
 105  * <br>For more information, see
 106  * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#transferTiming">Timing
 107  * Focus Transfers</a>, a section in
 108  * <a href="https://docs.oracle.com/javase/tutorial/uiswing/">The Swing
 109  * Tutorial</a>.
 110  *
 111  * <li>Making a top-level container visible.
 112  * <br>Calling {@code setVisible(true)} on a {@code Window},
 113  *     {@code Frame} or {@code Dialog} may occur
 114  *     asynchronously.
 115  *
 116  * <li>Setting the size or location of a top-level container.
 117  * <br>Calls to {@code setSize}, {@code setBounds} or
 118  *     {@code setLocation} on a {@code Window},
 119  *     {@code Frame} or {@code Dialog} are forwarded
 120  *     to the underlying window management system and may be
 121  *     ignored or modified.  See {@link java.awt.Window} for
 122  *     more information.
 123  * </ul>
 124  * <p>
 125  * Most applications should not call any of the methods in this
 126  * class directly. The methods defined by {@code Toolkit} are
 127  * the "glue" that joins the platform-independent classes in the
 128  * {@code java.awt} package with their counterparts in
 129  * {@code java.awt.peer}. Some methods defined by
 130  * {@code Toolkit} query the native operating system directly.
 131  *
 132  * @author      Sami Shaio
 133  * @author      Arthur van Hoff
 134  * @author      Fred Ecks
 135  * @since       1.0
 136  */
 137 public abstract class Toolkit {
 138 
 139     /**
 140      * Constructs a {@code Toolkit}.
 141      */
 142     protected Toolkit() {}
 143 
 144     // The following method is called by the private method
 145     // <code>updateSystemColors</code> in <code>SystemColor</code>.
 146 
 147     /**
 148      * Fills in the integer array that is supplied as an argument
 149      * with the current system color values.
 150      *
 151      * @param     systemColors an integer array.
 152      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 153      * returns true
 154      * @see       java.awt.GraphicsEnvironment#isHeadless
 155      * @since     1.1
 156      */
 157     protected void loadSystemColors(int[] systemColors)
 158         throws HeadlessException {
 159         GraphicsEnvironment.checkHeadless();
 160     }
 161 
 162     /**
 163      * Controls whether the layout of Containers is validated dynamically
 164      * during resizing, or statically, after resizing is complete.
 165      * Use {@code isDynamicLayoutActive()} to detect if this feature enabled
 166      * in this program and is supported by this operating system
 167      * and/or window manager.
 168      * Note that this feature is supported not on all platforms, and
 169      * conversely, that this feature cannot be turned off on some platforms.
 170      * On these platforms where dynamic layout during resizing is not supported
 171      * (or is always supported), setting this property has no effect.
 172      * Note that this feature can be set or unset as a property of the
 173      * operating system or window manager on some platforms.  On such
 174      * platforms, the dynamic resize property must be set at the operating
 175      * system or window manager level before this method can take effect.
 176      * This method does not change support or settings of the underlying
 177      * operating system or
 178      * window manager.  The OS/WM support can be
 179      * queried using getDesktopProperty("awt.dynamicLayoutSupported") method.
 180      *
 181      * @param     dynamic  If true, Containers should re-layout their
 182      *            components as the Container is being resized.  If false,
 183      *            the layout will be validated after resizing is completed.
 184      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 185      *            returns true
 186      * @see       #isDynamicLayoutSet()
 187      * @see       #isDynamicLayoutActive()
 188      * @see       #getDesktopProperty(String propertyName)
 189      * @see       java.awt.GraphicsEnvironment#isHeadless
 190      * @since     1.4
 191      */
 192     public void setDynamicLayout(final boolean dynamic)
 193         throws HeadlessException {
 194         GraphicsEnvironment.checkHeadless();
 195         if (this != getDefaultToolkit()) {
 196             getDefaultToolkit().setDynamicLayout(dynamic);
 197         }
 198     }
 199 
 200     /**
 201      * Returns whether the layout of Containers is validated dynamically
 202      * during resizing, or statically, after resizing is complete.
 203      * Note: this method returns the value that was set programmatically;
 204      * it does not reflect support at the level of the operating system
 205      * or window manager for dynamic layout on resizing, or the current
 206      * operating system or window manager settings.  The OS/WM support can
 207      * be queried using getDesktopProperty("awt.dynamicLayoutSupported").
 208      *
 209      * @return    true if validation of Containers is done dynamically,
 210      *            false if validation is done after resizing is finished.
 211      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 212      *            returns true
 213      * @see       #setDynamicLayout(boolean dynamic)
 214      * @see       #isDynamicLayoutActive()
 215      * @see       #getDesktopProperty(String propertyName)
 216      * @see       java.awt.GraphicsEnvironment#isHeadless
 217      * @since     1.4
 218      */
 219     protected boolean isDynamicLayoutSet()
 220         throws HeadlessException {
 221         GraphicsEnvironment.checkHeadless();
 222 
 223         if (this != Toolkit.getDefaultToolkit()) {
 224             return Toolkit.getDefaultToolkit().isDynamicLayoutSet();
 225         } else {
 226             return false;
 227         }
 228     }
 229 
 230     /**
 231      * Returns whether dynamic layout of Containers on resize is currently
 232      * enabled on the underlying operating system and/or window manager. If the
 233      * platform supports it, {@code setDynamicLayout(boolean)} may be used to
 234      * programmatically enable or disable platform dynamic layout. Regardless of
 235      * whether that toggling is supported, or whether {@code true} or {@code
 236      * false} is specified as an argument, or has never been called at all, this
 237      * method will return the active current platform behavior and which will be
 238      * followed by the JDK in determining layout policy during resizing.
 239      * <p>
 240      * If dynamic layout is currently inactive then Containers re-layout their
 241      * components when resizing is completed. As a result the
 242      * {@code Component.validate()} method will be invoked only once per resize.
 243      * If dynamic layout is currently active then Containers re-layout their
 244      * components on every native resize event and the {@code validate()} method
 245      * will be invoked each time. The OS/WM support can be queried using the
 246      * getDesktopProperty("awt.dynamicLayoutSupported") method. This property
 247      * will reflect the platform capability but is not sufficient to tell if it
 248      * is presently enabled.
 249      *
 250      * @return true if dynamic layout of Containers on resize is currently
 251      *         active, false otherwise.
 252      * @throws HeadlessException if the GraphicsEnvironment.isHeadless() method
 253      *         returns true
 254      * @see #setDynamicLayout(boolean dynamic)
 255      * @see #isDynamicLayoutSet()
 256      * @see #getDesktopProperty(String propertyName)
 257      * @see java.awt.GraphicsEnvironment#isHeadless
 258      * @since 1.4
 259      */
 260     public boolean isDynamicLayoutActive()
 261         throws HeadlessException {
 262         GraphicsEnvironment.checkHeadless();
 263 
 264         if (this != Toolkit.getDefaultToolkit()) {
 265             return Toolkit.getDefaultToolkit().isDynamicLayoutActive();
 266         } else {
 267             return false;
 268         }
 269     }
 270 
 271     /**
 272      * Gets the size of the screen.  On systems with multiple displays, the
 273      * primary display is used.  Multi-screen aware display dimensions are
 274      * available from {@code GraphicsConfiguration} and
 275      * {@code GraphicsDevice}.
 276      * @return    the size of this toolkit's screen, in pixels.
 277      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 278      * returns true
 279      * @see       java.awt.GraphicsConfiguration#getBounds
 280      * @see       java.awt.GraphicsDevice#getDisplayMode
 281      * @see       java.awt.GraphicsEnvironment#isHeadless
 282      */
 283     public abstract Dimension getScreenSize()
 284         throws HeadlessException;
 285 
 286     /**
 287      * Returns the screen resolution in dots-per-inch.
 288      * @return    this toolkit's screen resolution, in dots-per-inch.
 289      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 290      * returns true
 291      * @see       java.awt.GraphicsEnvironment#isHeadless
 292      */
 293     public abstract int getScreenResolution()
 294         throws HeadlessException;
 295 
 296     /**
 297      * Gets the insets of the screen.
 298      * @param     gc a {@code GraphicsConfiguration}
 299      * @return    the insets of this toolkit's screen, in pixels.
 300      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 301      * returns true
 302      * @see       java.awt.GraphicsEnvironment#isHeadless
 303      * @since     1.4
 304      */
 305     public Insets getScreenInsets(GraphicsConfiguration gc)
 306         throws HeadlessException {
 307         GraphicsEnvironment.checkHeadless();
 308         if (this != Toolkit.getDefaultToolkit()) {
 309             return Toolkit.getDefaultToolkit().getScreenInsets(gc);
 310         } else {
 311             return new Insets(0, 0, 0, 0);
 312         }
 313     }
 314 
 315     /**
 316      * Determines the color model of this toolkit's screen.
 317      * <p>
 318      * {@code ColorModel} is an abstract class that
 319      * encapsulates the ability to translate between the
 320      * pixel values of an image and its red, green, blue,
 321      * and alpha components.
 322      * <p>
 323      * This toolkit method is called by the
 324      * {@code getColorModel} method
 325      * of the {@code Component} class.
 326      * @return    the color model of this toolkit's screen.
 327      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 328      * returns true
 329      * @see       java.awt.GraphicsEnvironment#isHeadless
 330      * @see       java.awt.image.ColorModel
 331      * @see       java.awt.Component#getColorModel
 332      */
 333     public abstract ColorModel getColorModel()
 334         throws HeadlessException;
 335 
 336     /**
 337      * Returns the names of the available fonts in this toolkit.<p>
 338      * For 1.1, the following font names are deprecated (the replacement
 339      * name follows):
 340      * <ul>
 341      * <li>TimesRoman (use Serif)
 342      * <li>Helvetica (use SansSerif)
 343      * <li>Courier (use Monospaced)
 344      * </ul><p>
 345      * The ZapfDingbats fontname is also deprecated in 1.1 but the characters
 346      * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports
 347      * those characters.
 348      * @return    the names of the available fonts in this toolkit.
 349      * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()}
 350      * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()
 351      */
 352     @Deprecated
 353     public abstract String[] getFontList();
 354 
 355     /**
 356      * Gets the screen device metrics for rendering of the font.
 357      * @param     font   a font
 358      * @return    the screen metrics of the specified font in this toolkit
 359      * @deprecated  As of JDK version 1.2, replaced by the {@code Font}
 360      *          method {@code getLineMetrics}.
 361      * @see java.awt.font.LineMetrics
 362      * @see java.awt.Font#getLineMetrics
 363      * @see java.awt.GraphicsEnvironment#getScreenDevices
 364      */
 365     @Deprecated
 366     public abstract FontMetrics getFontMetrics(Font font);
 367 
 368     /**
 369      * Synchronizes this toolkit's graphics state. Some window systems
 370      * may do buffering of graphics events.
 371      * <p>
 372      * This method ensures that the display is up-to-date. It is useful
 373      * for animation.
 374      */
 375     public abstract void sync();
 376 
 377     /**
 378      * The default toolkit.
 379      */
 380     private static Toolkit toolkit;
 381 
 382     /**
 383      * Used internally by the assistive technologies functions; set at
 384      * init time and used at load time
 385      */
 386     private static String atNames;
 387 
 388     /**
 389      * Initializes properties related to assistive technologies.
 390      * These properties are used both in the loadAssistiveProperties()
 391      * function below, as well as other classes in the jdk that depend
 392      * on the properties (such as the use of the screen_magnifier_present
 393      * property in Java2D hardware acceleration initialization).  The
 394      * initialization of the properties must be done before the platform-
 395      * specific Toolkit class is instantiated so that all necessary
 396      * properties are set up properly before any classes dependent upon them
 397      * are initialized.
 398      */
 399     private static void initAssistiveTechnologies() {
 400 
 401         // Get accessibility properties
 402         final String sep = File.separator;
 403         final Properties properties = new Properties();
 404 
 405 
 406         atNames = java.security.AccessController.doPrivileged(
 407             new java.security.PrivilegedAction<String>() {
 408             public String run() {
 409 
 410                 // Try loading the per-user accessibility properties file.
 411                 try {
 412                     File propsFile = new File(
 413                       System.getProperty("user.home") +
 414                       sep + ".accessibility.properties");
 415                     FileInputStream in =
 416                         new FileInputStream(propsFile);
 417 
 418                     // Inputstream has been buffered in Properties class
 419                     properties.load(in);
 420                     in.close();
 421                 } catch (Exception e) {
 422                     // Per-user accessibility properties file does not exist
 423                 }
 424 
 425                 // Try loading the system-wide accessibility properties
 426                 // file only if a per-user accessibility properties
 427                 // file does not exist or is empty.
 428                 if (properties.size() == 0) {
 429                     try {
 430                         File propsFile = new File(
 431                             System.getProperty("java.home") + sep + "conf" +
 432                             sep + "accessibility.properties");
 433                         FileInputStream in =
 434                             new FileInputStream(propsFile);
 435 
 436                         // Inputstream has been buffered in Properties class
 437                         properties.load(in);
 438                         in.close();
 439                     } catch (Exception e) {
 440                         // System-wide accessibility properties file does
 441                         // not exist;
 442                     }
 443                 }
 444 
 445                 // Get whether a screen magnifier is present.  First check
 446                 // the system property and then check the properties file.
 447                 String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present");
 448                 if (magPresent == null) {
 449                     magPresent = properties.getProperty("screen_magnifier_present", null);
 450                     if (magPresent != null) {
 451                         System.setProperty("javax.accessibility.screen_magnifier_present", magPresent);
 452                     }
 453                 }
 454 
 455                 // Get the names of any assistive technologies to load.  First
 456                 // check the system property and then check the properties
 457                 // file.
 458                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 459                 if (classNames == null) {
 460                     classNames = properties.getProperty("assistive_technologies", null);
 461                     if (classNames != null) {
 462                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 463                     }
 464                 }
 465                 return classNames;
 466             }
 467         });
 468     }
 469 
 470     /**
 471      * Rethrow the AWTError but include the cause.
 472      *
 473      * @param s the error message
 474      * @param e the original exception
 475      * @throws AWTError the new AWTError including the cause (the original exception)
 476      */
 477     private static void newAWTError(Throwable e, String s) {
 478         AWTError newAWTError = new AWTError(s);
 479         newAWTError.initCause(e);
 480         throw newAWTError;
 481     }
 482 
 483     /**
 484      * When a service provider for Assistive Technology is not found look for a
 485      * supporting class on the class path and instantiate it.
 486      *
 487      * @param atName the name of the class to be loaded
 488      */
 489     private static void fallbackToLoadClassForAT(String atName) {
 490         try {
 491             Class<?> c = Class.forName(atName, false, ClassLoader.getSystemClassLoader());
 492             c.getConstructor().newInstance();
 493         } catch (ClassNotFoundException e) {
 494             newAWTError(e, "Assistive Technology not found: " + atName);
 495         } catch (InstantiationException e) {
 496             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);
 497         } catch (IllegalAccessException e) {
 498             newAWTError(e, "Could not access Assistive Technology: " + atName);
 499         } catch (Exception e) {
 500             newAWTError(e, "Error trying to install Assistive Technology: " + atName);
 501         }
 502     }
 503 
 504     /**
 505      * Loads accessibility support using the property assistive_technologies.
 506      * The form is assistive_technologies= followed by a comma-separated list of
 507      * assistive technology providers to load.  The order in which providers are
 508      * loaded is determined by the order in which the ServiceLoader discovers
 509      * implementations of the AccessibilityProvider interface, not by the order
 510      * of provider names in the property list.  When a provider is found its
 511      * accessibility implementation will be started by calling the provider's
 512      * activate method. If the list of assistive technology providers is the
 513      * empty string or contains only
 514      * {@linkplain Character#isWhitespace(int) white space} characters or
 515      * {@code null} it is ignored. All other errors are handled via an AWTError
 516      * exception.
 517      */
 518     private static void loadAssistiveTechnologies() {
 519         // Load any assistive technologies
 520         if (atNames != null && !atNames.isBlank()) {
 521             ClassLoader cl = ClassLoader.getSystemClassLoader();
 522             Set<String> names = Arrays.stream(atNames.split(","))
 523                                       .map(String::trim)
 524                                       .collect(Collectors.toSet());
 525             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 526             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 527                 try {
 528                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 529                         String name = p.getName();
 530                         if (names.contains(name) && !providers.containsKey(name)) {
 531                             p.activate();
 532                             providers.put(name, p);
 533                         }
 534                     }
 535                 } catch (java.util.ServiceConfigurationError | Exception e) {
 536                     newAWTError(e, "Could not load or activate service provider");
 537                 }
 538                 return null;
 539             });
 540             names.stream()
 541                  .filter(n -> !providers.containsKey(n))
 542                  .forEach(Toolkit::fallbackToLoadClassForAT);
 543         }
 544     }
 545 
 546     /**
 547      * Gets the default toolkit.
 548      * <p>
 549      * If a system property named {@code "java.awt.headless"} is set
 550      * to {@code true} then the headless implementation
 551      * of {@code Toolkit} is used,
 552      * otherwise the default platform-specific implementation of
 553      * {@code Toolkit} is used.
 554      * <p>
 555      * If this Toolkit is not a headless implementation and if they exist, service
 556      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 557      * if specified by the system property
 558      * {@code javax.accessibility.assistive_technologies}.
 559      * <p>
 560      * An example of setting this property is to invoke Java with
 561      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 562      * In addition to MyServiceProvider other service providers can be specified
 563      * using a comma separated list.  Service providers are loaded after the AWT
 564      * toolkit is created.
 565      * <p>
 566      * If the list of assistive technology providers as provided through system
 567      * property "{@systemProperty javax.accessibility.assistive_technologies}"
 568      * is the empty string or contains only
 569      * {@linkplain Character#isWhitespace(int) white space} characters it is
 570      * ignored. All other errors are handled via an AWTError exception.
 571      * <p>
 572      * The names specified in the assistive_technologies property are used to query
 573      * each service provider implementation.  If the requested name matches the
 574      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 575      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 576      * matching service provider.
 577      *
 578      * @implSpec
 579      * If assistive technology service providers are not specified with a system
 580      * property this implementation will look in a properties file located as follows:
 581      * <ul>
 582      * <li> {@code ${user.home}/.accessibility.properties}
 583      * <li> {@code ${java.home}/conf/accessibility.properties}
 584      * </ul>
 585      * Only the first of these files to be located will be consulted.  The requested
 586      * service providers are specified by setting the {@code assistive_technologies=}
 587      * property.  A single provider or a comma separated list of providers can be
 588      * specified.
 589      *
 590      * @return     the default toolkit.
 591      * @throws  AWTError in case of an error loading assistive technologies.
 592      * @see java.util.ServiceLoader
 593      * @see javax.accessibility.AccessibilityProvider
 594      */
 595     public static synchronized Toolkit getDefaultToolkit() {
 596         if (toolkit == null) {
 597             toolkit = PlatformGraphicsInfo.createToolkit();
 598             if (GraphicsEnvironment.isHeadless() &&
 599                 !(toolkit instanceof HeadlessToolkit)) {
 600                 toolkit = new HeadlessToolkit(toolkit);
 601             }
 602             if (!GraphicsEnvironment.isHeadless()) {
 603                 loadAssistiveTechnologies();
 604             }
 605         }
 606         return toolkit;
 607     }
 608 
 609     /**
 610      * Returns an image which gets pixel data from the specified file,
 611      * whose format can be either GIF, JPEG or PNG.
 612      * The underlying toolkit attempts to resolve multiple requests
 613      * with the same filename to the same returned Image.
 614      * <p>
 615      * Since the mechanism required to facilitate this sharing of
 616      * {@code Image} objects may continue to hold onto images
 617      * that are no longer in use for an indefinite period of time,
 618      * developers are encouraged to implement their own caching of
 619      * images by using the {@link #createImage(java.lang.String) createImage}
 620      * variant wherever available.
 621      * If the image data contained in the specified file changes,
 622      * the {@code Image} object returned from this method may
 623      * still contain stale information which was loaded from the
 624      * file after a prior call.
 625      * Previously loaded image data can be manually discarded by
 626      * calling the {@link Image#flush flush} method on the
 627      * returned {@code Image}.
 628      * <p>
 629      * This method first checks if there is a security manager installed.
 630      * If so, the method calls the security manager's
 631      * {@code checkRead} method with the file specified to ensure
 632      * that the access to the image is allowed.
 633      * @param     filename   the name of a file containing pixel data
 634      *                         in a recognized file format.
 635      * @return    an image which gets its pixel data from
 636      *                         the specified file.
 637      * @throws SecurityException  if a security manager exists and its
 638      *                            checkRead method doesn't allow the operation.
 639      * @see #createImage(java.lang.String)
 640      */
 641     public abstract Image getImage(String filename);
 642 
 643     /**
 644      * Returns an image which gets pixel data from the specified URL.
 645      * The pixel data referenced by the specified URL must be in one
 646      * of the following formats: GIF, JPEG or PNG.
 647      * The underlying toolkit attempts to resolve multiple requests
 648      * with the same URL to the same returned Image.
 649      * <p>
 650      * Since the mechanism required to facilitate this sharing of
 651      * {@code Image} objects may continue to hold onto images
 652      * that are no longer in use for an indefinite period of time,
 653      * developers are encouraged to implement their own caching of
 654      * images by using the {@link #createImage(java.net.URL) createImage}
 655      * variant wherever available.
 656      * If the image data stored at the specified URL changes,
 657      * the {@code Image} object returned from this method may
 658      * still contain stale information which was fetched from the
 659      * URL after a prior call.
 660      * Previously loaded image data can be manually discarded by
 661      * calling the {@link Image#flush flush} method on the
 662      * returned {@code Image}.
 663      * <p>
 664      * This method first checks if there is a security manager installed.
 665      * If so, the method calls the security manager's
 666      * {@code checkPermission} method with the corresponding
 667      * permission to ensure that the access to the image is allowed.
 668      * If the connection to the specified URL requires
 669      * either {@code URLPermission} or {@code SocketPermission},
 670      * then {@code URLPermission} is used for security checks.
 671      * @param     url   the URL to use in fetching the pixel data.
 672      * @return    an image which gets its pixel data from
 673      *                         the specified URL.
 674      * @throws SecurityException  if a security manager exists and its
 675      *                            checkPermission method doesn't allow
 676      *                            the operation.
 677      * @see #createImage(java.net.URL)
 678      */
 679     public abstract Image getImage(URL url);
 680 
 681     /**
 682      * Returns an image which gets pixel data from the specified file.
 683      * The returned Image is a new object which will not be shared
 684      * with any other caller of this method or its getImage variant.
 685      * <p>
 686      * This method first checks if there is a security manager installed.
 687      * If so, the method calls the security manager's
 688      * {@code checkRead} method with the specified file to ensure
 689      * that the image creation is allowed.
 690      * @param     filename   the name of a file containing pixel data
 691      *                         in a recognized file format.
 692      * @return    an image which gets its pixel data from
 693      *                         the specified file.
 694      * @throws SecurityException  if a security manager exists and its
 695      *                            checkRead method doesn't allow the operation.
 696      * @see #getImage(java.lang.String)
 697      */
 698     public abstract Image createImage(String filename);
 699 
 700     /**
 701      * Returns an image which gets pixel data from the specified URL.
 702      * The returned Image is a new object which will not be shared
 703      * with any other caller of this method or its getImage variant.
 704      * <p>
 705      * This method first checks if there is a security manager installed.
 706      * If so, the method calls the security manager's
 707      * {@code checkPermission} method with the corresponding
 708      * permission to ensure that the image creation is allowed.
 709      * If the connection to the specified URL requires
 710      * either {@code URLPermission} or {@code SocketPermission},
 711      * then {@code URLPermission} is used for security checks.
 712      * @param     url   the URL to use in fetching the pixel data.
 713      * @return    an image which gets its pixel data from
 714      *                         the specified URL.
 715      * @throws SecurityException  if a security manager exists and its
 716      *                            checkPermission method doesn't allow
 717      *                            the operation.
 718      * @see #getImage(java.net.URL)
 719      */
 720     public abstract Image createImage(URL url);
 721 
 722     /**
 723      * Prepares an image for rendering.
 724      * <p>
 725      * If the values of the width and height arguments are both
 726      * {@code -1}, this method prepares the image for rendering
 727      * on the default screen; otherwise, this method prepares an image
 728      * for rendering on the default screen at the specified width and height.
 729      * <p>
 730      * The image data is downloaded asynchronously in another thread,
 731      * and an appropriately scaled screen representation of the image is
 732      * generated.
 733      * <p>
 734      * This method is called by components {@code prepareImage}
 735      * methods.
 736      * <p>
 737      * Information on the flags returned by this method can be found
 738      * with the definition of the {@code ImageObserver} interface.
 739 
 740      * @param     image      the image for which to prepare a
 741      *                           screen representation.
 742      * @param     width      the width of the desired screen
 743      *                           representation, or {@code -1}.
 744      * @param     height     the height of the desired screen
 745      *                           representation, or {@code -1}.
 746      * @param     observer   the {@code ImageObserver}
 747      *                           object to be notified as the
 748      *                           image is being prepared.
 749      * @return    {@code true} if the image has already been
 750      *                 fully prepared; {@code false} otherwise.
 751      * @see       java.awt.Component#prepareImage(java.awt.Image,
 752      *                 java.awt.image.ImageObserver)
 753      * @see       java.awt.Component#prepareImage(java.awt.Image,
 754      *                 int, int, java.awt.image.ImageObserver)
 755      * @see       java.awt.image.ImageObserver
 756      */
 757     public abstract boolean prepareImage(Image image, int width, int height,
 758                                          ImageObserver observer);
 759 
 760     /**
 761      * Indicates the construction status of a specified image that is
 762      * being prepared for display.
 763      * <p>
 764      * If the values of the width and height arguments are both
 765      * {@code -1}, this method returns the construction status of
 766      * a screen representation of the specified image in this toolkit.
 767      * Otherwise, this method returns the construction status of a
 768      * scaled representation of the image at the specified width
 769      * and height.
 770      * <p>
 771      * This method does not cause the image to begin loading.
 772      * An application must call {@code prepareImage} to force
 773      * the loading of an image.
 774      * <p>
 775      * This method is called by the component's {@code checkImage}
 776      * methods.
 777      * <p>
 778      * Information on the flags returned by this method can be found
 779      * with the definition of the {@code ImageObserver} interface.
 780      * @param     image   the image whose status is being checked.
 781      * @param     width   the width of the scaled version whose status is
 782      *                 being checked, or {@code -1}.
 783      * @param     height  the height of the scaled version whose status
 784      *                 is being checked, or {@code -1}.
 785      * @param     observer   the {@code ImageObserver} object to be
 786      *                 notified as the image is being prepared.
 787      * @return    the bitwise inclusive <strong>OR</strong> of the
 788      *                 {@code ImageObserver} flags for the
 789      *                 image data that is currently available.
 790      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 791      *                 int, int, java.awt.image.ImageObserver)
 792      * @see       java.awt.Component#checkImage(java.awt.Image,
 793      *                 java.awt.image.ImageObserver)
 794      * @see       java.awt.Component#checkImage(java.awt.Image,
 795      *                 int, int, java.awt.image.ImageObserver)
 796      * @see       java.awt.image.ImageObserver
 797      */
 798     public abstract int checkImage(Image image, int width, int height,
 799                                    ImageObserver observer);
 800 
 801     /**
 802      * Creates an image with the specified image producer.
 803      * @param     producer the image producer to be used.
 804      * @return    an image with the specified image producer.
 805      * @see       java.awt.Image
 806      * @see       java.awt.image.ImageProducer
 807      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 808      */
 809     public abstract Image createImage(ImageProducer producer);
 810 
 811     /**
 812      * Creates an image which decodes the image stored in the specified
 813      * byte array.
 814      * <p>
 815      * The data must be in some image format, such as GIF or JPEG,
 816      * that is supported by this toolkit.
 817      * @param     imagedata   an array of bytes, representing
 818      *                         image data in a supported image format.
 819      * @return    an image.
 820      * @since     1.1
 821      */
 822     public Image createImage(byte[] imagedata) {
 823         return createImage(imagedata, 0, imagedata.length);
 824     }
 825 
 826     /**
 827      * Creates an image which decodes the image stored in the specified
 828      * byte array, and at the specified offset and length.
 829      * The data must be in some image format, such as GIF or JPEG,
 830      * that is supported by this toolkit.
 831      * @param     imagedata   an array of bytes, representing
 832      *                         image data in a supported image format.
 833      * @param     imageoffset  the offset of the beginning
 834      *                         of the data in the array.
 835      * @param     imagelength  the length of the data in the array.
 836      * @return    an image.
 837      * @since     1.1
 838      */
 839     public abstract Image createImage(byte[] imagedata,
 840                                       int imageoffset,
 841                                       int imagelength);
 842 
 843     /**
 844      * Gets a {@code PrintJob} object which is the result of initiating
 845      * a print operation on the toolkit's platform.
 846      * <p>
 847      * Each actual implementation of this method should first check if there
 848      * is a security manager installed. If there is, the method should call
 849      * the security manager's {@code checkPrintJobAccess} method to
 850      * ensure initiation of a print operation is allowed. If the default
 851      * implementation of {@code checkPrintJobAccess} is used (that is,
 852      * that method is not overriden), then this results in a call to the
 853      * security manager's {@code checkPermission} method with a
 854      * {@code RuntimePermission("queuePrintJob")} permission.
 855      *
 856      * @param   frame the parent of the print dialog. May not be null.
 857      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 858      *          to "".
 859      * @param   props a Properties object containing zero or more properties.
 860      *          Properties are not standardized and are not consistent across
 861      *          implementations. Because of this, PrintJobs which require job
 862      *          and page control should use the version of this function which
 863      *          takes JobAttributes and PageAttributes objects. This object
 864      *          may be updated to reflect the user's job choices on exit. May
 865      *          be null.
 866      * @return  a {@code PrintJob} object, or {@code null} if the
 867      *          user cancelled the print job.
 868      * @throws  NullPointerException if frame is null
 869      * @throws  SecurityException if this thread is not allowed to initiate a
 870      *          print job request
 871      * @see     java.awt.GraphicsEnvironment#isHeadless
 872      * @see     java.awt.PrintJob
 873      * @see     java.lang.RuntimePermission
 874      * @since   1.1
 875      */
 876     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 877                                          Properties props);
 878 
 879     /**
 880      * Gets a {@code PrintJob} object which is the result of initiating
 881      * a print operation on the toolkit's platform.
 882      * <p>
 883      * Each actual implementation of this method should first check if there
 884      * is a security manager installed. If there is, the method should call
 885      * the security manager's {@code checkPrintJobAccess} method to
 886      * ensure initiation of a print operation is allowed. If the default
 887      * implementation of {@code checkPrintJobAccess} is used (that is,
 888      * that method is not overriden), then this results in a call to the
 889      * security manager's {@code checkPermission} method with a
 890      * {@code RuntimePermission("queuePrintJob")} permission.
 891      *
 892      * @param   frame the parent of the print dialog. May not be null.
 893      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 894      *          to "".
 895      * @param   jobAttributes a set of job attributes which will control the
 896      *          PrintJob. The attributes will be updated to reflect the user's
 897      *          choices as outlined in the JobAttributes documentation. May be
 898      *          null.
 899      * @param   pageAttributes a set of page attributes which will control the
 900      *          PrintJob. The attributes will be applied to every page in the
 901      *          job. The attributes will be updated to reflect the user's
 902      *          choices as outlined in the PageAttributes documentation. May be
 903      *          null.
 904      * @return  a {@code PrintJob} object, or {@code null} if the
 905      *          user cancelled the print job.
 906      * @throws  NullPointerException if frame is null
 907      * @throws  IllegalArgumentException if pageAttributes specifies differing
 908      *          cross feed and feed resolutions. Also if this thread has
 909      *          access to the file system and jobAttributes specifies
 910      *          print to file, and the specified destination file exists but
 911      *          is a directory rather than a regular file, does not exist but
 912      *          cannot be created, or cannot be opened for any other reason.
 913      *          However in the case of print to file, if a dialog is also
 914      *          requested to be displayed then the user will be given an
 915      *          opportunity to select a file and proceed with printing.
 916      *          The dialog will ensure that the selected output file
 917      *          is valid before returning from this method.
 918      * @throws  SecurityException if this thread is not allowed to initiate a
 919      *          print job request, or if jobAttributes specifies print to file,
 920      *          and this thread is not allowed to access the file system
 921      * @see     java.awt.PrintJob
 922      * @see     java.awt.GraphicsEnvironment#isHeadless
 923      * @see     java.lang.RuntimePermission
 924      * @see     java.awt.JobAttributes
 925      * @see     java.awt.PageAttributes
 926      * @since   1.3
 927      */
 928     public PrintJob getPrintJob(Frame frame, String jobtitle,
 929                                 JobAttributes jobAttributes,
 930                                 PageAttributes pageAttributes) {
 931         // Override to add printing support with new job/page control classes
 932 
 933         if (this != Toolkit.getDefaultToolkit()) {
 934             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 935                                                            jobAttributes,
 936                                                            pageAttributes);
 937         } else {
 938             return getPrintJob(frame, jobtitle, null);
 939         }
 940     }
 941 
 942     /**
 943      * Emits an audio beep depending on native system settings and hardware
 944      * capabilities.
 945      * @since     1.1
 946      */
 947     public abstract void beep();
 948 
 949     /**
 950      * Gets the singleton instance of the system Clipboard which interfaces
 951      * with clipboard facilities provided by the native platform. This
 952      * clipboard enables data transfer between Java programs and native
 953      * applications which use native clipboard facilities.
 954      * <p>
 955      * In addition to any and all default formats text returned by the system
 956      * Clipboard's {@code getTransferData()} method is available in the
 957      * following flavors:
 958      * <ul>
 959      * <li>DataFlavor.stringFlavor</li>
 960      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 961      * </ul>
 962      * As with {@code java.awt.datatransfer.StringSelection}, if the
 963      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 964      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 965      * the system Clipboard's {@code getTransferData()} method for
 966      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 967      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 968      * Because of this, support for
 969      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 970      * <b>deprecated</b>.
 971      * <p>
 972      * Each actual implementation of this method should first check if there
 973      * is a security manager installed. If there is, the method should call
 974      * the security manager's {@link SecurityManager#checkPermission
 975      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 976      *
 977      * @return    the system Clipboard
 978      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 979      * returns true
 980      * @see       java.awt.GraphicsEnvironment#isHeadless
 981      * @see       java.awt.datatransfer.Clipboard
 982      * @see       java.awt.datatransfer.StringSelection
 983      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
 984      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
 985      * @see       java.io.Reader
 986      * @see       java.awt.AWTPermission
 987      * @since     1.1
 988      */
 989     public abstract Clipboard getSystemClipboard()
 990         throws HeadlessException;
 991 
 992     /**
 993      * Gets the singleton instance of the system selection as a
 994      * {@code Clipboard} object. This allows an application to read and
 995      * modify the current, system-wide selection.
 996      * <p>
 997      * An application is responsible for updating the system selection whenever
 998      * the user selects text, using either the mouse or the keyboard.
 999      * Typically, this is implemented by installing a
1000      * {@code FocusListener} on all {@code Component}s which support
1001      * text selection, and, between {@code FOCUS_GAINED} and
1002      * {@code FOCUS_LOST} events delivered to that {@code Component},
1003      * updating the system selection {@code Clipboard} when the selection
1004      * changes inside the {@code Component}. Properly updating the system
1005      * selection ensures that a Java application will interact correctly with
1006      * native applications and other Java applications running simultaneously
1007      * on the system. Note that {@code java.awt.TextComponent} and
1008      * {@code javax.swing.text.JTextComponent} already adhere to this
1009      * policy. When using these classes, and their subclasses, developers need
1010      * not write any additional code.
1011      * <p>
1012      * Some platforms do not support a system selection {@code Clipboard}.
1013      * On those platforms, this method will return {@code null}. In such a
1014      * case, an application is absolved from its responsibility to update the
1015      * system selection {@code Clipboard} as described above.
1016      * <p>
1017      * Each actual implementation of this method should first check if there
1018      * is a security manager installed. If there is, the method should call
1019      * the security manager's {@link SecurityManager#checkPermission
1020      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1021      *
1022      * @return the system selection as a {@code Clipboard}, or
1023      *         {@code null} if the native platform does not support a
1024      *         system selection {@code Clipboard}
1025      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1026      *            returns true
1027      *
1028      * @see java.awt.datatransfer.Clipboard
1029      * @see java.awt.event.FocusListener
1030      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1031      * @see java.awt.event.FocusEvent#FOCUS_LOST
1032      * @see TextComponent
1033      * @see javax.swing.text.JTextComponent
1034      * @see AWTPermission
1035      * @see GraphicsEnvironment#isHeadless
1036      * @since 1.4
1037      */
1038     public Clipboard getSystemSelection() throws HeadlessException {
1039         GraphicsEnvironment.checkHeadless();
1040 
1041         if (this != Toolkit.getDefaultToolkit()) {
1042             return Toolkit.getDefaultToolkit().getSystemSelection();
1043         } else {
1044             GraphicsEnvironment.checkHeadless();
1045             return null;
1046         }
1047     }
1048 
1049     /**
1050      * Determines which modifier key is the appropriate accelerator
1051      * key for menu shortcuts.
1052      * <p>
1053      * Menu shortcuts, which are embodied in the
1054      * {@code MenuShortcut} class, are handled by the
1055      * {@code MenuBar} class.
1056      * <p>
1057      * By default, this method returns {@code Event.CTRL_MASK}.
1058      * Toolkit implementations should override this method if the
1059      * <b>Control</b> key isn't the correct key for accelerators.
1060      * @return    the modifier mask on the {@code Event} class
1061      *                 that is used for menu shortcuts on this toolkit.
1062      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1063      * returns true
1064      * @see       java.awt.GraphicsEnvironment#isHeadless
1065      * @see       java.awt.MenuBar
1066      * @see       java.awt.MenuShortcut
1067      * @deprecated It is recommended that extended modifier keys and
1068      *             {@link #getMenuShortcutKeyMaskEx()} be used instead
1069      * @since     1.1
1070      */
1071     @Deprecated(since = "10")
1072     public int getMenuShortcutKeyMask() throws HeadlessException {
1073         GraphicsEnvironment.checkHeadless();
1074 
1075         return Event.CTRL_MASK;
1076     }
1077 
1078     /**
1079      * Determines which extended modifier key is the appropriate accelerator
1080      * key for menu shortcuts.
1081      * <p>
1082      * Menu shortcuts, which are embodied in the {@code MenuShortcut} class, are
1083      * handled by the {@code MenuBar} class.
1084      * <p>
1085      * By default, this method returns {@code InputEvent.CTRL_DOWN_MASK}.
1086      * Toolkit implementations should override this method if the
1087      * <b>Control</b> key isn't the correct key for accelerators.
1088      *
1089      * @return the modifier mask on the {@code InputEvent} class that is used
1090      *         for menu shortcuts on this toolkit
1091      * @throws HeadlessException if GraphicsEnvironment.isHeadless() returns
1092      *         true
1093      * @see java.awt.GraphicsEnvironment#isHeadless
1094      * @see java.awt.MenuBar
1095      * @see java.awt.MenuShortcut
1096      * @since 10
1097      */
1098     public int getMenuShortcutKeyMaskEx() throws HeadlessException {
1099         GraphicsEnvironment.checkHeadless();
1100 
1101         return InputEvent.CTRL_DOWN_MASK;
1102     }
1103 
1104     /**
1105      * Returns whether the given locking key on the keyboard is currently in
1106      * its "on" state.
1107      * Valid key codes are
1108      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1109      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1110      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1111      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1112      *
1113      * @param  keyCode the key code
1114      * @return {@code true} if the given key is currently in its "on" state;
1115      *          otherwise {@code false}
1116      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1117      * is not one of the valid key codes
1118      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1119      * allow getting the state of this key programmatically, or if the keyboard
1120      * doesn't have this key
1121      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1122      * returns true
1123      * @see       java.awt.GraphicsEnvironment#isHeadless
1124      * @since 1.3
1125      */
1126     public boolean getLockingKeyState(int keyCode)
1127         throws UnsupportedOperationException
1128     {
1129         GraphicsEnvironment.checkHeadless();
1130 
1131         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1132                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1133             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1134         }
1135         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1136     }
1137 
1138     /**
1139      * Sets the state of the given locking key on the keyboard.
1140      * Valid key codes are
1141      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1142      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1143      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1144      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1145      * <p>
1146      * Depending on the platform, setting the state of a locking key may
1147      * involve event processing and therefore may not be immediately
1148      * observable through getLockingKeyState.
1149      *
1150      * @param  keyCode the key code
1151      * @param  on the state of the key
1152      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1153      * is not one of the valid key codes
1154      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1155      * allow setting the state of this key programmatically, or if the keyboard
1156      * doesn't have this key
1157      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1158      * returns true
1159      * @see       java.awt.GraphicsEnvironment#isHeadless
1160      * @since 1.3
1161      */
1162     public void setLockingKeyState(int keyCode, boolean on)
1163         throws UnsupportedOperationException
1164     {
1165         GraphicsEnvironment.checkHeadless();
1166 
1167         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1168                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1169             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1170         }
1171         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1172     }
1173 
1174     /**
1175      * Give native peers the ability to query the native container
1176      * given a native component (eg the direct parent may be lightweight).
1177      *
1178      * @param  c the component to fetch the container for
1179      * @return the native container object for the component
1180      */
1181     protected static Container getNativeContainer(Component c) {
1182         return c.getNativeContainer();
1183     }
1184 
1185     /**
1186      * Creates a new custom cursor object.
1187      * If the image to display is invalid, the cursor will be hidden (made
1188      * completely transparent), and the hotspot will be set to (0, 0).
1189      *
1190      * <p>Note that multi-frame images are invalid and may cause this
1191      * method to hang.
1192      *
1193      * @param cursor the image to display when the cursor is activated
1194      * @param hotSpot the X and Y of the large cursor's hot spot; the
1195      *   hotSpot values must be less than the Dimension returned by
1196      *   {@code getBestCursorSize}
1197      * @param     name a localized description of the cursor, for Java Accessibility use
1198      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1199      *   the bounds of the cursor
1200      * @return the cursor created
1201      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1202      * returns true
1203      * @see       java.awt.GraphicsEnvironment#isHeadless
1204      * @since     1.2
1205      */
1206     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1207         throws IndexOutOfBoundsException, HeadlessException
1208     {
1209         // Override to implement custom cursor support.
1210         if (this != Toolkit.getDefaultToolkit()) {
1211             return Toolkit.getDefaultToolkit().
1212                 createCustomCursor(cursor, hotSpot, name);
1213         } else {
1214             return new Cursor(Cursor.DEFAULT_CURSOR);
1215         }
1216     }
1217 
1218     /**
1219      * Returns the supported cursor dimension which is closest to the desired
1220      * sizes.  Systems which only support a single cursor size will return that
1221      * size regardless of the desired sizes.  Systems which don't support custom
1222      * cursors will return a dimension of 0, 0. <p>
1223      * Note:  if an image is used whose dimensions don't match a supported size
1224      * (as returned by this method), the Toolkit implementation will attempt to
1225      * resize the image to a supported size.
1226      * Since converting low-resolution images is difficult,
1227      * no guarantees are made as to the quality of a cursor image which isn't a
1228      * supported size.  It is therefore recommended that this method
1229      * be called and an appropriate image used so no image conversion is made.
1230      *
1231      * @param     preferredWidth the preferred cursor width the component would like
1232      * to use.
1233      * @param     preferredHeight the preferred cursor height the component would like
1234      * to use.
1235      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1236      * the Toolkit implementation doesn't support custom cursors.
1237      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1238      * returns true
1239      * @see       java.awt.GraphicsEnvironment#isHeadless
1240      * @since     1.2
1241      */
1242     public Dimension getBestCursorSize(int preferredWidth,
1243         int preferredHeight) throws HeadlessException {
1244         GraphicsEnvironment.checkHeadless();
1245 
1246         // Override to implement custom cursor support.
1247         if (this != Toolkit.getDefaultToolkit()) {
1248             return Toolkit.getDefaultToolkit().
1249                 getBestCursorSize(preferredWidth, preferredHeight);
1250         } else {
1251             return new Dimension(0, 0);
1252         }
1253     }
1254 
1255     /**
1256      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1257      * palette.<p>
1258      * Note: if an image is used which has more colors in its palette than
1259      * the supported maximum, the Toolkit implementation will attempt to flatten the
1260      * palette to the maximum.  Since converting low-resolution images is difficult,
1261      * no guarantees are made as to the quality of a cursor image which has more
1262      * colors than the system supports.  It is therefore recommended that this method
1263      * be called and an appropriate image used so no image conversion is made.
1264      *
1265      * @return    the maximum number of colors, or zero if custom cursors are not
1266      * supported by this Toolkit implementation.
1267      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1268      * returns true
1269      * @see       java.awt.GraphicsEnvironment#isHeadless
1270      * @since     1.2
1271      */
1272     public int getMaximumCursorColors() throws HeadlessException {
1273         GraphicsEnvironment.checkHeadless();
1274 
1275         // Override to implement custom cursor support.
1276         if (this != Toolkit.getDefaultToolkit()) {
1277             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1278         } else {
1279             return 0;
1280         }
1281     }
1282 
1283     /**
1284      * Returns whether Toolkit supports this state for
1285      * {@code Frame}s.  This method tells whether the <em>UI
1286      * concept</em> of, say, maximization or iconification is
1287      * supported.  It will always return false for "compound" states
1288      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1289      * In other words, the rule of thumb is that only queries with a
1290      * single frame state constant as an argument are meaningful.
1291      * <p>Note that supporting a given concept is a platform-
1292      * dependent feature. Due to native limitations the Toolkit
1293      * object may report a particular state as supported, however at
1294      * the same time the Toolkit object will be unable to apply the
1295      * state to a given frame.  This circumstance has two following
1296      * consequences:
1297      * <ul>
1298      * <li>Only the return value of {@code false} for the present
1299      * method actually indicates that the given state is not
1300      * supported. If the method returns {@code true} the given state
1301      * may still be unsupported and/or unavailable for a particular
1302      * frame.
1303      * <li>The developer should consider examining the value of the
1304      * {@link java.awt.event.WindowEvent#getNewState} method of the
1305      * {@code WindowEvent} received through the {@link
1306      * java.awt.event.WindowStateListener}, rather than assuming
1307      * that the state given to the {@code setExtendedState()} method
1308      * will be definitely applied. For more information see the
1309      * documentation for the {@link Frame#setExtendedState} method.
1310      * </ul>
1311      *
1312      * @param state one of named frame state constants.
1313      * @return {@code true} is this frame state is supported by
1314      *     this Toolkit implementation, {@code false} otherwise.
1315      * @exception HeadlessException
1316      *     if {@code GraphicsEnvironment.isHeadless()}
1317      *     returns {@code true}.
1318      * @see java.awt.Window#addWindowStateListener
1319      * @since   1.4
1320      */
1321     public boolean isFrameStateSupported(int state)
1322         throws HeadlessException
1323     {
1324         GraphicsEnvironment.checkHeadless();
1325 
1326         if (this != Toolkit.getDefaultToolkit()) {
1327             return Toolkit.getDefaultToolkit().
1328                 isFrameStateSupported(state);
1329         } else {
1330             return (state == Frame.NORMAL); // others are not guaranteed
1331         }
1332     }
1333 
1334     /**
1335      * Support for I18N: any visible strings should be stored in
1336      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1337      * here, so that only one copy is maintained.
1338      */
1339     private static ResourceBundle resources;
1340     private static ResourceBundle platformResources;
1341 
1342     // called by platform toolkit
1343     private static void setPlatformResources(ResourceBundle bundle) {
1344         platformResources = bundle;
1345     }
1346 
1347     /**
1348      * Initialize JNI field and method ids
1349      */
1350     private static native void initIDs();
1351 
1352     /**
1353      * WARNING: This is a temporary workaround for a problem in the
1354      * way the AWT loads native libraries. A number of classes in the
1355      * AWT package have a native method, initIDs(), which initializes
1356      * the JNI field and method ids used in the native portion of
1357      * their implementation.
1358      *
1359      * Since the use and storage of these ids is done by the
1360      * implementation libraries, the implementation of these method is
1361      * provided by the particular AWT implementations (for example,
1362      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1363      * problem is that this means that the native libraries must be
1364      * loaded by the java.* classes, which do not necessarily know the
1365      * names of the libraries to load. A better way of doing this
1366      * would be to provide a separate library which defines java.awt.*
1367      * initIDs, and exports the relevant symbols out to the
1368      * implementation libraries.
1369      *
1370      * For now, we know it's done by the implementation, and we assume
1371      * that the name of the library is "awt".  -br.
1372      *
1373      * If you change loadLibraries(), please add the change to
1374      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1375      * classes can be loaded in java.awt.image that depend on
1376      * libawt and there is no way to call Toolkit.loadLibraries()
1377      * directly.  -hung
1378      */
1379     private static boolean loaded = false;
1380     static void loadLibraries() {
1381         if (!loaded) {
1382             java.security.AccessController.doPrivileged(
1383                 new java.security.PrivilegedAction<Void>() {
1384                     public Void run() {
1385                         System.loadLibrary("awt");
1386                         return null;
1387                     }
1388                 });
1389             loaded = true;
1390         }
1391     }
1392 
1393     static {
1394         AWTAccessor.setToolkitAccessor(
1395                 new AWTAccessor.ToolkitAccessor() {
1396                     @Override
1397                     public void setPlatformResources(ResourceBundle bundle) {
1398                         Toolkit.setPlatformResources(bundle);
1399                     }
1400                 });
1401 
1402         java.security.AccessController.doPrivileged(
1403                                  new java.security.PrivilegedAction<Void>() {
1404             public Void run() {
1405                 try {
1406                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1407                 } catch (MissingResourceException e) {
1408                     // No resource file; defaults will be used.
1409                 }
1410                 return null;
1411             }
1412         });
1413 
1414         // ensure that the proper libraries are loaded
1415         loadLibraries();
1416         initAssistiveTechnologies();
1417         initIDs();
1418     }
1419 
1420     /**
1421      * Gets a property with the specified key and default.
1422      * This method returns defaultValue if the property is not found.
1423      *
1424      * @param  key the key
1425      * @param  defaultValue the default value
1426      * @return the value of the property or the default value
1427      *         if the property was not found
1428      */
1429     public static String getProperty(String key, String defaultValue) {
1430         // first try platform specific bundle
1431         if (platformResources != null) {
1432             try {
1433                 return platformResources.getString(key);
1434             }
1435             catch (MissingResourceException e) {}
1436         }
1437 
1438         // then shared one
1439         if (resources != null) {
1440             try {
1441                 return resources.getString(key);
1442             }
1443             catch (MissingResourceException e) {}
1444         }
1445 
1446         return defaultValue;
1447     }
1448 
1449     /**
1450      * Get the application's or applet's EventQueue instance.
1451      * Depending on the Toolkit implementation, different EventQueues
1452      * may be returned for different applets.  Applets should
1453      * therefore not assume that the EventQueue instance returned
1454      * by this method will be shared by other applets or the system.
1455      *
1456      * <p> If there is a security manager then its
1457      * {@link SecurityManager#checkPermission checkPermission} method
1458      * is called to check {@code AWTPermission("accessEventQueue")}.
1459      *
1460      * @return    the {@code EventQueue} object
1461      * @throws  SecurityException
1462      *          if a security manager is set and it denies access to
1463      *          the {@code EventQueue}
1464      * @see     java.awt.AWTPermission
1465     */
1466     public final EventQueue getSystemEventQueue() {
1467         SecurityManager security = System.getSecurityManager();
1468         if (security != null) {
1469             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1470         }
1471         return getSystemEventQueueImpl();
1472     }
1473 
1474     /**
1475      * Gets the application's or applet's {@code EventQueue}
1476      * instance, without checking access.  For security reasons,
1477      * this can only be called from a {@code Toolkit} subclass.
1478      * @return the {@code EventQueue} object
1479      */
1480     protected abstract EventQueue getSystemEventQueueImpl();
1481 
1482     /* Accessor method for use by AWT package routines. */
1483     static EventQueue getEventQueue() {
1484         return getDefaultToolkit().getSystemEventQueueImpl();
1485     }
1486 
1487     /**
1488      * Creates a concrete, platform dependent, subclass of the abstract
1489      * DragGestureRecognizer class requested, and associates it with the
1490      * DragSource, Component and DragGestureListener specified.
1491      *
1492      * subclasses should override this to provide their own implementation
1493      *
1494      * @param <T> the type of DragGestureRecognizer to create
1495      * @param abstractRecognizerClass The abstract class of the required recognizer
1496      * @param ds                      The DragSource
1497      * @param c                       The Component target for the DragGestureRecognizer
1498      * @param srcActions              The actions permitted for the gesture
1499      * @param dgl                     The DragGestureListener
1500      *
1501      * @return the new object or null.  Always returns null if
1502      * GraphicsEnvironment.isHeadless() returns true.
1503      * @see java.awt.GraphicsEnvironment#isHeadless
1504      */
1505     public <T extends DragGestureRecognizer> T
1506         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1507                                     DragSource ds, Component c, int srcActions,
1508                                     DragGestureListener dgl)
1509     {
1510         return null;
1511     }
1512 
1513     /**
1514      * Obtains a value for the specified desktop property.
1515      *
1516      * A desktop property is a uniquely named value for a resource that
1517      * is Toolkit global in nature. Usually it also is an abstract
1518      * representation for an underlying platform dependent desktop setting.
1519      * For more information on desktop properties supported by the AWT see
1520      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1521      *
1522      * @param  propertyName the property name
1523      * @return the value for the specified desktop property
1524      */
1525     public final synchronized Object getDesktopProperty(String propertyName) {
1526         // This is a workaround for headless toolkits.  It would be
1527         // better to override this method but it is declared final.
1528         // "this instanceof" syntax defeats polymorphism.
1529         // --mm, 03/03/00
1530         if (this instanceof HeadlessToolkit) {
1531             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1532                 .getDesktopProperty(propertyName);
1533         }
1534 
1535         if (desktopProperties.isEmpty()) {
1536             initializeDesktopProperties();
1537         }
1538 
1539         Object value;
1540 
1541         // This property should never be cached
1542         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1543             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1544         }
1545 
1546         value = desktopProperties.get(propertyName);
1547 
1548         if (value == null) {
1549             value = lazilyLoadDesktopProperty(propertyName);
1550 
1551             if (value != null) {
1552                 setDesktopProperty(propertyName, value);
1553             }
1554         }
1555 
1556         /* for property "awt.font.desktophints" */
1557         if (value instanceof RenderingHints) {
1558             value = ((RenderingHints)value).clone();
1559         }
1560 
1561         return value;
1562     }
1563 
1564     /**
1565      * Sets the named desktop property to the specified value and fires a
1566      * property change event to notify any listeners that the value has changed.
1567      *
1568      * @param  name the property name
1569      * @param  newValue the new property value
1570      */
1571     protected final void setDesktopProperty(String name, Object newValue) {
1572         // This is a workaround for headless toolkits.  It would be
1573         // better to override this method but it is declared final.
1574         // "this instanceof" syntax defeats polymorphism.
1575         // --mm, 03/03/00
1576         if (this instanceof HeadlessToolkit) {
1577             ((HeadlessToolkit)this).getUnderlyingToolkit()
1578                 .setDesktopProperty(name, newValue);
1579             return;
1580         }
1581         Object oldValue;
1582 
1583         synchronized (this) {
1584             oldValue = desktopProperties.get(name);
1585             desktopProperties.put(name, newValue);
1586         }
1587 
1588         // Don't fire change event if old and new values are null.
1589         // It helps to avoid recursive resending of WM_THEMECHANGED
1590         if (oldValue != null || newValue != null) {
1591             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1592         }
1593     }
1594 
1595     /**
1596      * An opportunity to lazily evaluate desktop property values.
1597      * @return the desktop property or null
1598      * @param name the name
1599      */
1600     protected Object lazilyLoadDesktopProperty(String name) {
1601         return null;
1602     }
1603 
1604     /**
1605      * initializeDesktopProperties
1606      */
1607     protected void initializeDesktopProperties() {
1608     }
1609 
1610     /**
1611      * Adds the specified property change listener for the named desktop
1612      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1613      * its property name is ignored, and the wrapped listener is added.
1614      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1615      * no exception is thrown and no action is performed.
1616      *
1617      * @param   name The name of the property to listen for
1618      * @param   pcl The property change listener
1619      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1620                 PropertyChangeListener)
1621      * @since   1.2
1622      */
1623     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1624         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1625     }
1626 
1627     /**
1628      * Removes the specified property change listener for the named
1629      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1630      * is removed, its property name is ignored, and
1631      * the wrapped listener is removed.
1632      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1633      * no exception is thrown and no action is performed.
1634      *
1635      * @param   name The name of the property to remove
1636      * @param   pcl The property change listener
1637      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1638                 PropertyChangeListener)
1639      * @since   1.2
1640      */
1641     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1642         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1643     }
1644 
1645     /**
1646      * Returns an array of all the property change listeners
1647      * registered on this toolkit. The returned array
1648      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1649      * that associate listeners with the names of desktop properties.
1650      *
1651      * @return all of this toolkit's {@link PropertyChangeListener}
1652      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1653      *         or an empty array  if no listeners are added
1654      *
1655      * @see PropertyChangeSupport#getPropertyChangeListeners()
1656      * @since 1.4
1657      */
1658     public PropertyChangeListener[] getPropertyChangeListeners() {
1659         return desktopPropsSupport.getPropertyChangeListeners();
1660     }
1661 
1662     /**
1663      * Returns an array of all property change listeners
1664      * associated with the specified name of a desktop property.
1665      *
1666      * @param  propertyName the named property
1667      * @return all of the {@code PropertyChangeListener} objects
1668      *         associated with the specified name of a desktop property
1669      *         or an empty array if no such listeners are added
1670      *
1671      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1672      * @since 1.4
1673      */
1674     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1675         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1676     }
1677 
1678     /**
1679      * The desktop properties.
1680      */
1681     protected final Map<String,Object> desktopProperties =
1682             new HashMap<String,Object>();
1683     /**
1684      * The desktop properties change support.
1685      */
1686     protected final PropertyChangeSupport desktopPropsSupport =
1687             Toolkit.createPropertyChangeSupport(this);
1688 
1689     /**
1690      * Returns whether the always-on-top mode is supported by this toolkit.
1691      * To detect whether the always-on-top mode is supported for a
1692      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1693      * @return {@code true}, if current toolkit supports the always-on-top mode,
1694      *     otherwise returns {@code false}
1695      * @see Window#isAlwaysOnTopSupported
1696      * @see Window#setAlwaysOnTop(boolean)
1697      * @since 1.6
1698      */
1699     public boolean isAlwaysOnTopSupported() {
1700         return true;
1701     }
1702 
1703     /**
1704      * Returns whether the given modality type is supported by this toolkit. If
1705      * a dialog with unsupported modality type is created, then
1706      * {@code Dialog.ModalityType.MODELESS} is used instead.
1707      *
1708      * @param modalityType modality type to be checked for support by this toolkit
1709      *
1710      * @return {@code true}, if current toolkit supports given modality
1711      *     type, {@code false} otherwise
1712      *
1713      * @see java.awt.Dialog.ModalityType
1714      * @see java.awt.Dialog#getModalityType
1715      * @see java.awt.Dialog#setModalityType
1716      *
1717      * @since 1.6
1718      */
1719     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1720 
1721     /**
1722      * Returns whether the given modal exclusion type is supported by this
1723      * toolkit. If an unsupported modal exclusion type property is set on a window,
1724      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1725      *
1726      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1727      *
1728      * @return {@code true}, if current toolkit supports given modal exclusion
1729      *     type, {@code false} otherwise
1730      *
1731      * @see java.awt.Dialog.ModalExclusionType
1732      * @see java.awt.Window#getModalExclusionType
1733      * @see java.awt.Window#setModalExclusionType
1734      *
1735      * @since 1.6
1736      */
1737     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1738 
1739     // 8014718: logging has been removed from SunToolkit
1740 
1741     private static final int LONG_BITS = 64;
1742     private int[] calls = new int[LONG_BITS];
1743     private static volatile long enabledOnToolkitMask;
1744     private AWTEventListener eventListener = null;
1745     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1746 
1747     /*
1748      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1749      * if the listener is proxied.
1750      */
1751     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1752     {
1753         AWTEventListener localL = l;
1754 
1755         if (localL == null) {
1756             return null;
1757         }
1758         // if user passed in a AWTEventListenerProxy object, extract
1759         // the listener
1760         if (l instanceof AWTEventListenerProxy) {
1761             localL = ((AWTEventListenerProxy)l).getListener();
1762         }
1763         return localL;
1764     }
1765 
1766     /**
1767      * Adds an AWTEventListener to receive all AWTEvents dispatched
1768      * system-wide that conform to the given {@code eventMask}.
1769      * <p>
1770      * First, if there is a security manager, its {@code checkPermission}
1771      * method is called with an
1772      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1773      * This may result in a SecurityException.
1774      * <p>
1775      * {@code eventMask} is a bitmask of event types to receive.
1776      * It is constructed by bitwise OR-ing together the event masks
1777      * defined in {@code AWTEvent}.
1778      * <p>
1779      * Note:  event listener use is not recommended for normal
1780      * application use, but are intended solely to support special
1781      * purpose facilities including support for accessibility,
1782      * event record/playback, and diagnostic tracing.
1783      *
1784      * If listener is null, no exception is thrown and no action is performed.
1785      *
1786      * @param    listener   the event listener.
1787      * @param    eventMask  the bitmask of event types to receive
1788      * @throws SecurityException
1789      *        if a security manager exists and its
1790      *        {@code checkPermission} method doesn't allow the operation.
1791      * @see      #removeAWTEventListener
1792      * @see      #getAWTEventListeners
1793      * @see      SecurityManager#checkPermission
1794      * @see      java.awt.AWTEvent
1795      * @see      java.awt.AWTPermission
1796      * @see      java.awt.event.AWTEventListener
1797      * @see      java.awt.event.AWTEventListenerProxy
1798      * @since    1.2
1799      */
1800     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1801         AWTEventListener localL = deProxyAWTEventListener(listener);
1802 
1803         if (localL == null) {
1804             return;
1805         }
1806         SecurityManager security = System.getSecurityManager();
1807         if (security != null) {
1808           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1809         }
1810         synchronized (this) {
1811             SelectiveAWTEventListener selectiveListener =
1812                 listener2SelectiveListener.get(localL);
1813 
1814             if (selectiveListener == null) {
1815                 // Create a new selectiveListener.
1816                 selectiveListener = new SelectiveAWTEventListener(localL,
1817                                                                  eventMask);
1818                 listener2SelectiveListener.put(localL, selectiveListener);
1819                 eventListener = ToolkitEventMulticaster.add(eventListener,
1820                                                             selectiveListener);
1821             }
1822             // OR the eventMask into the selectiveListener's event mask.
1823             selectiveListener.orEventMasks(eventMask);
1824 
1825             enabledOnToolkitMask |= eventMask;
1826 
1827             long mask = eventMask;
1828             for (int i=0; i<LONG_BITS; i++) {
1829                 // If no bits are set, break out of loop.
1830                 if (mask == 0) {
1831                     break;
1832                 }
1833                 if ((mask & 1L) != 0) {  // Always test bit 0.
1834                     calls[i]++;
1835                 }
1836                 mask >>>= 1;  // Right shift, fill with zeros on left.
1837             }
1838         }
1839     }
1840 
1841     /**
1842      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1843      * <p>
1844      * First, if there is a security manager, its {@code checkPermission}
1845      * method is called with an
1846      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1847      * This may result in a SecurityException.
1848      * <p>
1849      * Note:  event listener use is not recommended for normal
1850      * application use, but are intended solely to support special
1851      * purpose facilities including support for accessibility,
1852      * event record/playback, and diagnostic tracing.
1853      *
1854      * If listener is null, no exception is thrown and no action is performed.
1855      *
1856      * @param    listener   the event listener.
1857      * @throws SecurityException
1858      *        if a security manager exists and its
1859      *        {@code checkPermission} method doesn't allow the operation.
1860      * @see      #addAWTEventListener
1861      * @see      #getAWTEventListeners
1862      * @see      SecurityManager#checkPermission
1863      * @see      java.awt.AWTEvent
1864      * @see      java.awt.AWTPermission
1865      * @see      java.awt.event.AWTEventListener
1866      * @see      java.awt.event.AWTEventListenerProxy
1867      * @since    1.2
1868      */
1869     public void removeAWTEventListener(AWTEventListener listener) {
1870         AWTEventListener localL = deProxyAWTEventListener(listener);
1871 
1872         if (listener == null) {
1873             return;
1874         }
1875         SecurityManager security = System.getSecurityManager();
1876         if (security != null) {
1877             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1878         }
1879 
1880         synchronized (this) {
1881             SelectiveAWTEventListener selectiveListener =
1882                 listener2SelectiveListener.get(localL);
1883 
1884             if (selectiveListener != null) {
1885                 listener2SelectiveListener.remove(localL);
1886                 int[] listenerCalls = selectiveListener.getCalls();
1887                 for (int i=0; i<LONG_BITS; i++) {
1888                     calls[i] -= listenerCalls[i];
1889                     assert calls[i] >= 0: "Negative Listeners count";
1890 
1891                     if (calls[i] == 0) {
1892                         enabledOnToolkitMask &= ~(1L<<i);
1893                     }
1894                 }
1895             }
1896             eventListener = ToolkitEventMulticaster.remove(eventListener,
1897             (selectiveListener == null) ? localL : selectiveListener);
1898         }
1899     }
1900 
1901     static boolean enabledOnToolkit(long eventMask) {
1902         return (enabledOnToolkitMask & eventMask) != 0;
1903         }
1904 
1905     synchronized int countAWTEventListeners(long eventMask) {
1906         int ci = 0;
1907         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1908         }
1909         ci--;
1910         return calls[ci];
1911     }
1912     /**
1913      * Returns an array of all the {@code AWTEventListener}s
1914      * registered on this toolkit.
1915      * If there is a security manager, its {@code checkPermission}
1916      * method is called with an
1917      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1918      * This may result in a SecurityException.
1919      * Listeners can be returned
1920      * within {@code AWTEventListenerProxy} objects, which also contain
1921      * the event mask for the given listener.
1922      * Note that listener objects
1923      * added multiple times appear only once in the returned array.
1924      *
1925      * @return all of the {@code AWTEventListener}s or an empty
1926      *         array if no listeners are currently registered
1927      * @throws SecurityException
1928      *        if a security manager exists and its
1929      *        {@code checkPermission} method doesn't allow the operation.
1930      * @see      #addAWTEventListener
1931      * @see      #removeAWTEventListener
1932      * @see      SecurityManager#checkPermission
1933      * @see      java.awt.AWTEvent
1934      * @see      java.awt.AWTPermission
1935      * @see      java.awt.event.AWTEventListener
1936      * @see      java.awt.event.AWTEventListenerProxy
1937      * @since 1.4
1938      */
1939     public AWTEventListener[] getAWTEventListeners() {
1940         SecurityManager security = System.getSecurityManager();
1941         if (security != null) {
1942             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1943         }
1944         synchronized (this) {
1945             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1946 
1947             AWTEventListener[] ret = new AWTEventListener[la.length];
1948             for (int i = 0; i < la.length; i++) {
1949                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1950                 AWTEventListener tempL = sael.getListener();
1951                 //assert tempL is not an AWTEventListenerProxy - we should
1952                 // have weeded them all out
1953                 // don't want to wrap a proxy inside a proxy
1954                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1955             }
1956             return ret;
1957         }
1958     }
1959 
1960     /**
1961      * Returns an array of all the {@code AWTEventListener}s
1962      * registered on this toolkit which listen to all of the event
1963      * types specified in the {@code eventMask} argument.
1964      * If there is a security manager, its {@code checkPermission}
1965      * method is called with an
1966      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1967      * This may result in a SecurityException.
1968      * Listeners can be returned
1969      * within {@code AWTEventListenerProxy} objects, which also contain
1970      * the event mask for the given listener.
1971      * Note that listener objects
1972      * added multiple times appear only once in the returned array.
1973      *
1974      * @param  eventMask the bitmask of event types to listen for
1975      * @return all of the {@code AWTEventListener}s registered
1976      *         on this toolkit for the specified
1977      *         event types, or an empty array if no such listeners
1978      *         are currently registered
1979      * @throws SecurityException
1980      *        if a security manager exists and its
1981      *        {@code checkPermission} method doesn't allow the operation.
1982      * @see      #addAWTEventListener
1983      * @see      #removeAWTEventListener
1984      * @see      SecurityManager#checkPermission
1985      * @see      java.awt.AWTEvent
1986      * @see      java.awt.AWTPermission
1987      * @see      java.awt.event.AWTEventListener
1988      * @see      java.awt.event.AWTEventListenerProxy
1989      * @since 1.4
1990      */
1991     public AWTEventListener[] getAWTEventListeners(long eventMask) {
1992         SecurityManager security = System.getSecurityManager();
1993         if (security != null) {
1994             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1995         }
1996         synchronized (this) {
1997             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1998 
1999             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
2000 
2001             for (int i = 0; i < la.length; i++) {
2002                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2003                 if ((sael.getEventMask() & eventMask) == eventMask) {
2004                     //AWTEventListener tempL = sael.getListener();
2005                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
2006                                                        sael.getListener()));
2007                 }
2008             }
2009             return list.toArray(new AWTEventListener[0]);
2010         }
2011     }
2012 
2013     /*
2014      * This method notifies any AWTEventListeners that an event
2015      * is about to be dispatched.
2016      *
2017      * @param theEvent the event which will be dispatched.
2018      */
2019     void notifyAWTEventListeners(AWTEvent theEvent) {
2020         // This is a workaround for headless toolkits.  It would be
2021         // better to override this method but it is declared package private.
2022         // "this instanceof" syntax defeats polymorphism.
2023         // --mm, 03/03/00
2024         if (this instanceof HeadlessToolkit) {
2025             ((HeadlessToolkit)this).getUnderlyingToolkit()
2026                 .notifyAWTEventListeners(theEvent);
2027             return;
2028         }
2029 
2030         AWTEventListener eventListener = this.eventListener;
2031         if (eventListener != null) {
2032             eventListener.eventDispatched(theEvent);
2033         }
2034     }
2035 
2036     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2037         implements AWTEventListener {
2038         // Implementation cloned from AWTEventMulticaster.
2039 
2040         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2041             super(a, b);
2042         }
2043 
2044         @SuppressWarnings("overloads")
2045         static AWTEventListener add(AWTEventListener a,
2046                                     AWTEventListener b) {
2047             if (a == null)  return b;
2048             if (b == null)  return a;
2049             return new ToolkitEventMulticaster(a, b);
2050         }
2051 
2052         @SuppressWarnings("overloads")
2053         static AWTEventListener remove(AWTEventListener l,
2054                                        AWTEventListener oldl) {
2055             return (AWTEventListener) removeInternal(l, oldl);
2056         }
2057 
2058         // #4178589: must overload remove(EventListener) to call our add()
2059         // instead of the static addInternal() so we allocate a
2060         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2061         // Note: this method is called by AWTEventListener.removeInternal(),
2062         // so its method signature must match AWTEventListener.remove().
2063         protected EventListener remove(EventListener oldl) {
2064             if (oldl == a)  return b;
2065             if (oldl == b)  return a;
2066             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2067             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2068             if (a2 == a && b2 == b) {
2069                 return this;    // it's not here
2070             }
2071             return add(a2, b2);
2072         }
2073 
2074         public void eventDispatched(AWTEvent event) {
2075             ((AWTEventListener)a).eventDispatched(event);
2076             ((AWTEventListener)b).eventDispatched(event);
2077         }
2078     }
2079 
2080     private class SelectiveAWTEventListener implements AWTEventListener {
2081         AWTEventListener listener;
2082         private long eventMask;
2083         // This array contains the number of times to call the eventlistener
2084         // for each event type.
2085         int[] calls = new int[Toolkit.LONG_BITS];
2086 
2087         public AWTEventListener getListener() {return listener;}
2088         public long getEventMask() {return eventMask;}
2089         public int[] getCalls() {return calls;}
2090 
2091         public void orEventMasks(long mask) {
2092             eventMask |= mask;
2093             // For each event bit set in mask, increment its call count.
2094             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2095                 // If no bits are set, break out of loop.
2096                 if (mask == 0) {
2097                     break;
2098                 }
2099                 if ((mask & 1L) != 0) {  // Always test bit 0.
2100                     calls[i]++;
2101                 }
2102                 mask >>>= 1;  // Right shift, fill with zeros on left.
2103             }
2104         }
2105 
2106         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2107             listener = l;
2108             eventMask = mask;
2109         }
2110 
2111         public void eventDispatched(AWTEvent event) {
2112             long eventBit = 0; // Used to save the bit of the event type.
2113             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2114                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2115                  event.id <= ComponentEvent.COMPONENT_LAST)
2116              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2117                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2118                  event.id <= ContainerEvent.CONTAINER_LAST)
2119              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2120                  event.id >= FocusEvent.FOCUS_FIRST &&
2121                  event.id <= FocusEvent.FOCUS_LAST)
2122              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2123                  event.id >= KeyEvent.KEY_FIRST &&
2124                  event.id <= KeyEvent.KEY_LAST)
2125              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2126                  event.id == MouseEvent.MOUSE_WHEEL)
2127              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2128                  (event.id == MouseEvent.MOUSE_MOVED ||
2129                   event.id == MouseEvent.MOUSE_DRAGGED))
2130              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2131                  event.id != MouseEvent.MOUSE_MOVED &&
2132                  event.id != MouseEvent.MOUSE_DRAGGED &&
2133                  event.id != MouseEvent.MOUSE_WHEEL &&
2134                  event.id >= MouseEvent.MOUSE_FIRST &&
2135                  event.id <= MouseEvent.MOUSE_LAST)
2136              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2137                  (event.id >= WindowEvent.WINDOW_FIRST &&
2138                  event.id <= WindowEvent.WINDOW_LAST))
2139              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2140                  event.id >= ActionEvent.ACTION_FIRST &&
2141                  event.id <= ActionEvent.ACTION_LAST)
2142              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2143                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2144                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2145              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2146                  event.id >= ItemEvent.ITEM_FIRST &&
2147                  event.id <= ItemEvent.ITEM_LAST)
2148              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2149                  event.id >= TextEvent.TEXT_FIRST &&
2150                  event.id <= TextEvent.TEXT_LAST)
2151              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2152                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2153                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2154              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2155                  event.id >= PaintEvent.PAINT_FIRST &&
2156                  event.id <= PaintEvent.PAINT_LAST)
2157              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2158                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2159                  event.id <= InvocationEvent.INVOCATION_LAST)
2160              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2161                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2162              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2163                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2164                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2165              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2166                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2167              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2168                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2169                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2170                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2171                     (event instanceof sun.awt.UngrabEvent))) {
2172                 // Get the index of the call count for this event type.
2173                 // Instead of using Math.log(...) we will calculate it with
2174                 // bit shifts. That's what previous implementation looked like:
2175                 //
2176                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2177                 int ci = 0;
2178                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2179                 }
2180                 ci--;
2181                 // Call the listener as many times as it was added for this
2182                 // event type.
2183                 for (int i=0; i<calls[ci]; i++) {
2184                     listener.eventDispatched(event);
2185                 }
2186             }
2187         }
2188     }
2189 
2190     /**
2191      * Returns a map of visual attributes for the abstract level description
2192      * of the given input method highlight, or null if no mapping is found.
2193      * The style field of the input method highlight is ignored. The map
2194      * returned is unmodifiable.
2195      * @param highlight input method highlight
2196      * @return style attribute map, or {@code null}
2197      * @exception HeadlessException if
2198      *     {@code GraphicsEnvironment.isHeadless} returns true
2199      * @see       java.awt.GraphicsEnvironment#isHeadless
2200      * @since 1.3
2201      */
2202     public abstract Map<java.awt.font.TextAttribute,?>
2203         mapInputMethodHighlight(InputMethodHighlight highlight)
2204         throws HeadlessException;
2205 
2206     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2207         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2208             return new DesktopPropertyChangeSupport(toolkit);
2209         } else {
2210             return new PropertyChangeSupport(toolkit);
2211         }
2212     }
2213 
2214     @SuppressWarnings("serial")
2215     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2216 
2217         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2218                 new StringBuilder("desktop property change support key");
2219         private final Object source;
2220 
2221         public DesktopPropertyChangeSupport(Object sourceBean) {
2222             super(sourceBean);
2223             source = sourceBean;
2224         }
2225 
2226         @Override
2227         public synchronized void addPropertyChangeListener(
2228                 String propertyName,
2229                 PropertyChangeListener listener)
2230         {
2231             PropertyChangeSupport pcs = (PropertyChangeSupport)
2232                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2233             if (null == pcs) {
2234                 pcs = new PropertyChangeSupport(source);
2235                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2236             }
2237             pcs.addPropertyChangeListener(propertyName, listener);
2238         }
2239 
2240         @Override
2241         public synchronized void removePropertyChangeListener(
2242                 String propertyName,
2243                 PropertyChangeListener listener)
2244         {
2245             PropertyChangeSupport pcs = (PropertyChangeSupport)
2246                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2247             if (null != pcs) {
2248                 pcs.removePropertyChangeListener(propertyName, listener);
2249             }
2250         }
2251 
2252         @Override
2253         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2254         {
2255             PropertyChangeSupport pcs = (PropertyChangeSupport)
2256                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2257             if (null != pcs) {
2258                 return pcs.getPropertyChangeListeners();
2259             } else {
2260                 return new PropertyChangeListener[0];
2261             }
2262         }
2263 
2264         @Override
2265         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2266         {
2267             PropertyChangeSupport pcs = (PropertyChangeSupport)
2268                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2269             if (null != pcs) {
2270                 return pcs.getPropertyChangeListeners(propertyName);
2271             } else {
2272                 return new PropertyChangeListener[0];
2273             }
2274         }
2275 
2276         @Override
2277         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2278             PropertyChangeSupport pcs = (PropertyChangeSupport)
2279                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2280             if (null == pcs) {
2281                 pcs = new PropertyChangeSupport(source);
2282                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2283             }
2284             pcs.addPropertyChangeListener(listener);
2285         }
2286 
2287         @Override
2288         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2289             PropertyChangeSupport pcs = (PropertyChangeSupport)
2290                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2291             if (null != pcs) {
2292                 pcs.removePropertyChangeListener(listener);
2293             }
2294         }
2295 
2296         /*
2297          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2298          * use this method.  If this will be changed we will need to change this class.
2299          */
2300         @Override
2301         public void firePropertyChange(final PropertyChangeEvent evt) {
2302             Object oldValue = evt.getOldValue();
2303             Object newValue = evt.getNewValue();
2304             String propertyName = evt.getPropertyName();
2305             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2306                 return;
2307             }
2308             Runnable updater = new Runnable() {
2309                 public void run() {
2310                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2311                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2312                     if (null != pcs) {
2313                         pcs.firePropertyChange(evt);
2314                     }
2315                 }
2316             };
2317             final AppContext currentAppContext = AppContext.getAppContext();
2318             for (AppContext appContext : AppContext.getAppContexts()) {
2319                 if (null == appContext || appContext.isDisposed()) {
2320                     continue;
2321                 }
2322                 if (currentAppContext == appContext) {
2323                     updater.run();
2324                 } else {
2325                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2326                     SunToolkit.postEvent(appContext, e);
2327                 }
2328             }
2329         }
2330     }
2331 
2332     /**
2333     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2334     * {@code EventQueue}.
2335     * <br>
2336     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2337     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2338     * startup by the following command:
2339     * <pre>
2340     * java -Dsun.awt.enableExtraMouseButtons=false Application
2341     * </pre>
2342     * Alternatively, the property could be set in the application by using the following code:
2343     * <pre>
2344     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2345     * </pre>
2346     * before the {@code Toolkit} class initialization.
2347     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2348     * initialized with {@code true}.
2349     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2350     *
2351     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2352     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2353     *         {@code false} otherwise
2354     * @see System#getProperty(String propertyName)
2355     * @see System#setProperty(String propertyName, String value)
2356     * @see java.awt.EventQueue
2357     * @since 1.7
2358      */
2359     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2360         GraphicsEnvironment.checkHeadless();
2361 
2362         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2363     }
2364 }
--- EOF ---