1 /*
   2  * Copyright (c) 1995, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.awt;
  27 
  28 import java.awt.datatransfer.Clipboard;
  29 import java.awt.dnd.DragGestureListener;
  30 import java.awt.dnd.DragGestureRecognizer;
  31 import java.awt.dnd.DragSource;
  32 import java.awt.event.*;
  33 import java.awt.im.InputMethodHighlight;
  34 import java.awt.image.ColorModel;
  35 import java.awt.image.ImageObserver;
  36 import java.awt.image.ImageProducer;
  37 import java.beans.PropertyChangeEvent;
  38 import java.beans.PropertyChangeListener;
  39 import java.beans.PropertyChangeSupport;
  40 import java.io.File;
  41 import java.io.FileInputStream;
  42 import java.net.URL;
  43 import java.util.ArrayList;
  44 import java.util.EventListener;
  45 import java.util.HashMap;
  46 import java.util.Map;
  47 import java.util.MissingResourceException;
  48 import java.util.Properties;
  49 import java.util.ResourceBundle;
  50 import java.util.StringTokenizer;
  51 import java.util.WeakHashMap;
  52 
  53 import sun.awt.AWTAccessor;
  54 import sun.awt.AWTPermissions;
  55 import sun.awt.AppContext;
  56 import sun.awt.HeadlessToolkit;
  57 import sun.awt.PeerEvent;
  58 import sun.awt.SunToolkit;
  59 
  60 import java.security.AccessController;
  61 import java.security.PrivilegedAction;
  62 import java.util.Arrays;
  63 import java.util.ServiceLoader;
  64 import java.util.Set;
  65 import java.util.stream.Collectors;
  66 import javax.accessibility.AccessibilityProvider;
  67 
  68 /**
  69  * This class is the abstract superclass of all actual
  70  * implementations of the Abstract Window Toolkit. Subclasses of
  71  * the {@code Toolkit} class are used to bind the various components
  72  * to particular native toolkit implementations.
  73  * <p>
  74  * Many GUI events may be delivered to user
  75  * asynchronously, if the opposite is not specified explicitly.
  76  * As well as
  77  * many GUI operations may be performed asynchronously.
  78  * This fact means that if the state of a component is set, and then
  79  * the state immediately queried, the returned value may not yet
  80  * reflect the requested change.  This behavior includes, but is not
  81  * limited to:
  82  * <ul>
  83  * <li>Scrolling to a specified position.
  84  * <br>For example, calling {@code ScrollPane.setScrollPosition}
  85  *     and then {@code getScrollPosition} may return an incorrect
  86  *     value if the original request has not yet been processed.
  87  *
  88  * <li>Moving the focus from one component to another.
  89  * <br>For more information, see
  90  * <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#transferTiming">Timing
  91  * Focus Transfers</a>, a section in
  92  * <a href="http://docs.oracle.com/javase/tutorial/uiswing/">The Swing
  93  * Tutorial</a>.
  94  *
  95  * <li>Making a top-level container visible.
  96  * <br>Calling {@code setVisible(true)} on a {@code Window},
  97  *     {@code Frame} or {@code Dialog} may occur
  98  *     asynchronously.
  99  *
 100  * <li>Setting the size or location of a top-level container.
 101  * <br>Calls to {@code setSize}, {@code setBounds} or
 102  *     {@code setLocation} on a {@code Window},
 103  *     {@code Frame} or {@code Dialog} are forwarded
 104  *     to the underlying window management system and may be
 105  *     ignored or modified.  See {@link java.awt.Window} for
 106  *     more information.
 107  * </ul>
 108  * <p>
 109  * Most applications should not call any of the methods in this
 110  * class directly. The methods defined by {@code Toolkit} are
 111  * the "glue" that joins the platform-independent classes in the
 112  * {@code java.awt} package with their counterparts in
 113  * {@code java.awt.peer}. Some methods defined by
 114  * {@code Toolkit} query the native operating system directly.
 115  *
 116  * @author      Sami Shaio
 117  * @author      Arthur van Hoff
 118  * @author      Fred Ecks
 119  * @since       1.0
 120  */
 121 public abstract class Toolkit {
 122 
 123     // The following method is called by the private method
 124     // <code>updateSystemColors</code> in <code>SystemColor</code>.
 125 
 126     /**
 127      * Fills in the integer array that is supplied as an argument
 128      * with the current system color values.
 129      *
 130      * @param     systemColors an integer array.
 131      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 132      * returns true
 133      * @see       java.awt.GraphicsEnvironment#isHeadless
 134      * @since     1.1
 135      */
 136     protected void loadSystemColors(int[] systemColors)
 137         throws HeadlessException {
 138         GraphicsEnvironment.checkHeadless();
 139     }
 140 
 141     /**
 142      * Controls whether the layout of Containers is validated dynamically
 143      * during resizing, or statically, after resizing is complete.
 144      * Use {@code isDynamicLayoutActive()} to detect if this feature enabled
 145      * in this program and is supported by this operating system
 146      * and/or window manager.
 147      * Note that this feature is supported not on all platforms, and
 148      * conversely, that this feature cannot be turned off on some platforms.
 149      * On these platforms where dynamic layout during resizing is not supported
 150      * (or is always supported), setting this property has no effect.
 151      * Note that this feature can be set or unset as a property of the
 152      * operating system or window manager on some platforms.  On such
 153      * platforms, the dynamic resize property must be set at the operating
 154      * system or window manager level before this method can take effect.
 155      * This method does not change support or settings of the underlying
 156      * operating system or
 157      * window manager.  The OS/WM support can be
 158      * queried using getDesktopProperty("awt.dynamicLayoutSupported") method.
 159      *
 160      * @param     dynamic  If true, Containers should re-layout their
 161      *            components as the Container is being resized.  If false,
 162      *            the layout will be validated after resizing is completed.
 163      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 164      *            returns true
 165      * @see       #isDynamicLayoutSet()
 166      * @see       #isDynamicLayoutActive()
 167      * @see       #getDesktopProperty(String propertyName)
 168      * @see       java.awt.GraphicsEnvironment#isHeadless
 169      * @since     1.4
 170      */
 171     public void setDynamicLayout(final boolean dynamic)
 172         throws HeadlessException {
 173         GraphicsEnvironment.checkHeadless();
 174         if (this != getDefaultToolkit()) {
 175             getDefaultToolkit().setDynamicLayout(dynamic);
 176         }
 177     }
 178 
 179     /**
 180      * Returns whether the layout of Containers is validated dynamically
 181      * during resizing, or statically, after resizing is complete.
 182      * Note: this method returns the value that was set programmatically;
 183      * it does not reflect support at the level of the operating system
 184      * or window manager for dynamic layout on resizing, or the current
 185      * operating system or window manager settings.  The OS/WM support can
 186      * be queried using getDesktopProperty("awt.dynamicLayoutSupported").
 187      *
 188      * @return    true if validation of Containers is done dynamically,
 189      *            false if validation is done after resizing is finished.
 190      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 191      *            returns true
 192      * @see       #setDynamicLayout(boolean dynamic)
 193      * @see       #isDynamicLayoutActive()
 194      * @see       #getDesktopProperty(String propertyName)
 195      * @see       java.awt.GraphicsEnvironment#isHeadless
 196      * @since     1.4
 197      */
 198     protected boolean isDynamicLayoutSet()
 199         throws HeadlessException {
 200         GraphicsEnvironment.checkHeadless();
 201 
 202         if (this != Toolkit.getDefaultToolkit()) {
 203             return Toolkit.getDefaultToolkit().isDynamicLayoutSet();
 204         } else {
 205             return false;
 206         }
 207     }
 208 
 209     /**
 210      * Returns whether dynamic layout of Containers on resize is currently
 211      * enabled on the underlying operating system and/or window manager. If the
 212      * platform supports it, {@code setDynamicLayout(boolean)} may be used to
 213      * programmatically enable or disable platform dynamic layout. Regardless of
 214      * whether that toggling is supported, or whether {@code true} or {@code
 215      * false} is specified as an argument, or has never been called at all, this
 216      * method will return the active current platform behavior and which will be
 217      * followed by the JDK in determining layout policy during resizing.
 218      * <p>
 219      * If dynamic layout is currently inactive then Containers re-layout their
 220      * components when resizing is completed. As a result the
 221      * {@code Component.validate()} method will be invoked only once per resize.
 222      * If dynamic layout is currently active then Containers re-layout their
 223      * components on every native resize event and the {@code validate()} method
 224      * will be invoked each time. The OS/WM support can be queried using the
 225      * getDesktopProperty("awt.dynamicLayoutSupported") method. This property
 226      * will reflect the platform capability but is not sufficient to tell if it
 227      * is presently enabled.
 228      *
 229      * @return true if dynamic layout of Containers on resize is currently
 230      *         active, false otherwise.
 231      * @throws HeadlessException if the GraphicsEnvironment.isHeadless() method
 232      *         returns true
 233      * @see #setDynamicLayout(boolean dynamic)
 234      * @see #isDynamicLayoutSet()
 235      * @see #getDesktopProperty(String propertyName)
 236      * @see java.awt.GraphicsEnvironment#isHeadless
 237      * @since 1.4
 238      */
 239     public boolean isDynamicLayoutActive()
 240         throws HeadlessException {
 241         GraphicsEnvironment.checkHeadless();
 242 
 243         if (this != Toolkit.getDefaultToolkit()) {
 244             return Toolkit.getDefaultToolkit().isDynamicLayoutActive();
 245         } else {
 246             return false;
 247         }
 248     }
 249 
 250     /**
 251      * Gets the size of the screen.  On systems with multiple displays, the
 252      * primary display is used.  Multi-screen aware display dimensions are
 253      * available from {@code GraphicsConfiguration} and
 254      * {@code GraphicsDevice}.
 255      * @return    the size of this toolkit's screen, in pixels.
 256      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 257      * returns true
 258      * @see       java.awt.GraphicsConfiguration#getBounds
 259      * @see       java.awt.GraphicsDevice#getDisplayMode
 260      * @see       java.awt.GraphicsEnvironment#isHeadless
 261      */
 262     public abstract Dimension getScreenSize()
 263         throws HeadlessException;
 264 
 265     /**
 266      * Returns the screen resolution in dots-per-inch.
 267      * @return    this toolkit's screen resolution, in dots-per-inch.
 268      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 269      * returns true
 270      * @see       java.awt.GraphicsEnvironment#isHeadless
 271      */
 272     public abstract int getScreenResolution()
 273         throws HeadlessException;
 274 
 275     /**
 276      * Gets the insets of the screen.
 277      * @param     gc a {@code GraphicsConfiguration}
 278      * @return    the insets of this toolkit's screen, in pixels.
 279      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 280      * returns true
 281      * @see       java.awt.GraphicsEnvironment#isHeadless
 282      * @since     1.4
 283      */
 284     public Insets getScreenInsets(GraphicsConfiguration gc)
 285         throws HeadlessException {
 286         GraphicsEnvironment.checkHeadless();
 287         if (this != Toolkit.getDefaultToolkit()) {
 288             return Toolkit.getDefaultToolkit().getScreenInsets(gc);
 289         } else {
 290             return new Insets(0, 0, 0, 0);
 291         }
 292     }
 293 
 294     /**
 295      * Determines the color model of this toolkit's screen.
 296      * <p>
 297      * {@code ColorModel} is an abstract class that
 298      * encapsulates the ability to translate between the
 299      * pixel values of an image and its red, green, blue,
 300      * and alpha components.
 301      * <p>
 302      * This toolkit method is called by the
 303      * {@code getColorModel} method
 304      * of the {@code Component} class.
 305      * @return    the color model of this toolkit's screen.
 306      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 307      * returns true
 308      * @see       java.awt.GraphicsEnvironment#isHeadless
 309      * @see       java.awt.image.ColorModel
 310      * @see       java.awt.Component#getColorModel
 311      */
 312     public abstract ColorModel getColorModel()
 313         throws HeadlessException;
 314 
 315     /**
 316      * Returns the names of the available fonts in this toolkit.<p>
 317      * For 1.1, the following font names are deprecated (the replacement
 318      * name follows):
 319      * <ul>
 320      * <li>TimesRoman (use Serif)
 321      * <li>Helvetica (use SansSerif)
 322      * <li>Courier (use Monospaced)
 323      * </ul><p>
 324      * The ZapfDingbats fontname is also deprecated in 1.1 but the characters
 325      * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports
 326      * those characters.
 327      * @return    the names of the available fonts in this toolkit.
 328      * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()}
 329      * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()
 330      */
 331     @Deprecated
 332     public abstract String[] getFontList();
 333 
 334     /**
 335      * Gets the screen device metrics for rendering of the font.
 336      * @param     font   a font
 337      * @return    the screen metrics of the specified font in this toolkit
 338      * @deprecated  As of JDK version 1.2, replaced by the {@code Font}
 339      *          method {@code getLineMetrics}.
 340      * @see java.awt.font.LineMetrics
 341      * @see java.awt.Font#getLineMetrics
 342      * @see java.awt.GraphicsEnvironment#getScreenDevices
 343      */
 344     @Deprecated
 345     public abstract FontMetrics getFontMetrics(Font font);
 346 
 347     /**
 348      * Synchronizes this toolkit's graphics state. Some window systems
 349      * may do buffering of graphics events.
 350      * <p>
 351      * This method ensures that the display is up-to-date. It is useful
 352      * for animation.
 353      */
 354     public abstract void sync();
 355 
 356     /**
 357      * The default toolkit.
 358      */
 359     private static Toolkit toolkit;
 360 
 361     /**
 362      * Used internally by the assistive technologies functions; set at
 363      * init time and used at load time
 364      */
 365     private static String atNames;
 366 
 367     /**
 368      * Initializes properties related to assistive technologies.
 369      * These properties are used both in the loadAssistiveProperties()
 370      * function below, as well as other classes in the jdk that depend
 371      * on the properties (such as the use of the screen_magnifier_present
 372      * property in Java2D hardware acceleration initialization).  The
 373      * initialization of the properties must be done before the platform-
 374      * specific Toolkit class is instantiated so that all necessary
 375      * properties are set up properly before any classes dependent upon them
 376      * are initialized.
 377      */
 378     private static void initAssistiveTechnologies() {
 379 
 380         // Get accessibility properties
 381         final String sep = File.separator;
 382         final Properties properties = new Properties();
 383 
 384 
 385         atNames = java.security.AccessController.doPrivileged(
 386             new java.security.PrivilegedAction<String>() {
 387             public String run() {
 388 
 389                 // Try loading the per-user accessibility properties file.
 390                 try {
 391                     File propsFile = new File(
 392                       System.getProperty("user.home") +
 393                       sep + ".accessibility.properties");
 394                     FileInputStream in =
 395                         new FileInputStream(propsFile);
 396 
 397                     // Inputstream has been buffered in Properties class
 398                     properties.load(in);
 399                     in.close();
 400                 } catch (Exception e) {
 401                     // Per-user accessibility properties file does not exist
 402                 }
 403 
 404                 // Try loading the system-wide accessibility properties
 405                 // file only if a per-user accessibility properties
 406                 // file does not exist or is empty.
 407                 if (properties.size() == 0) {
 408                     try {
 409                         File propsFile = new File(
 410                             System.getProperty("java.home") + sep + "conf" +
 411                             sep + "accessibility.properties");
 412                         FileInputStream in =
 413                             new FileInputStream(propsFile);
 414 
 415                         // Inputstream has been buffered in Properties class
 416                         properties.load(in);
 417                         in.close();
 418                     } catch (Exception e) {
 419                         // System-wide accessibility properties file does
 420                         // not exist;
 421                     }
 422                 }
 423 
 424                 // Get whether a screen magnifier is present.  First check
 425                 // the system property and then check the properties file.
 426                 String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present");
 427                 if (magPresent == null) {
 428                     magPresent = properties.getProperty("screen_magnifier_present", null);
 429                     if (magPresent != null) {
 430                         System.setProperty("javax.accessibility.screen_magnifier_present", magPresent);
 431                     }
 432                 }
 433 
 434                 // Get the names of any assistive technologies to load.  First
 435                 // check the system property and then check the properties
 436                 // file.
 437                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 438                 if (classNames == null) {
 439                     classNames = properties.getProperty("assistive_technologies", null);
 440                     if (classNames != null) {
 441                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 442                     }
 443                 }
 444                 return classNames;
 445             }
 446         });
 447     }
 448 
 449     /**
 450      * Rethrow the AWTError but include the cause.
 451      *
 452      * @param s the error message
 453      * @param e the original exception
 454      * @throws AWTError the new AWTError including the cause (the original exception)
 455      */
 456     private static void newAWTError(Throwable e, String s) {
 457         AWTError newAWTError = new AWTError(s);
 458         newAWTError.initCause(e);
 459         throw newAWTError;
 460     }
 461 
 462     /**
 463      * When a service provider for Assistive Technology is not found look for a
 464      * supporting class on the class path and instantiate it.
 465      *
 466      * @param atName the name of the class to be loaded
 467      */
 468     private static void fallbackToLoadClassForAT(String atName) {
 469         try {
 470             Class<?> c = Class.forName(atName, false, ClassLoader.getSystemClassLoader());
 471             c.getConstructor().newInstance();
 472         } catch (ClassNotFoundException e) {
 473             newAWTError(e, "Assistive Technology not found: " + atName);
 474         } catch (InstantiationException e) {
 475             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);
 476         } catch (IllegalAccessException e) {
 477             newAWTError(e, "Could not access Assistive Technology: " + atName);
 478         } catch (Exception e) {
 479             newAWTError(e, "Error trying to install Assistive Technology: " + atName);
 480         }
 481     }
 482 
 483     /**
 484      * Loads accessibility support using the property assistive_technologies.
 485      * The form is assistive_technologies= followed by a comma-separated list of
 486      * assistive technology providers to load.  The order in which providers are
 487      * loaded is determined by the order in which the ServiceLoader discovers
 488      * implementations of the AccessibilityProvider interface, not by the order
 489      * of provider names in the property list.  When a provider is found its
 490      * accessibility implementation will be started by calling the provider's
 491      * activate method.  All errors are handled via an AWTError exception.
 492      */
 493     private static void loadAssistiveTechnologies() {
 494         // Load any assistive technologies
 495         if (atNames != null) {
 496             ClassLoader cl = ClassLoader.getSystemClassLoader();
 497             Set<String> names = Arrays.stream(atNames.split(","))
 498                                       .map(String::trim)
 499                                       .collect(Collectors.toSet());
 500             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 501             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 502                 try {
 503                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 504                         String name = p.getName();
 505                         if (names.contains(name) && !providers.containsKey(name)) {
 506                             p.activate();
 507                             providers.put(name, p);
 508                         }
 509                     }
 510                 } catch (java.util.ServiceConfigurationError | Exception e) {
 511                     newAWTError(e, "Could not load or activate service provider");
 512                 }
 513                 return null;
 514             });
 515             names.stream()
 516                  .filter(n -> !providers.containsKey(n))
 517                  .forEach(Toolkit::fallbackToLoadClassForAT);
 518         }
 519     }
 520 
 521     /**
 522      * Gets the default toolkit.
 523      * <p>
 524      * If a system property named {@code "java.awt.headless"} is set
 525      * to {@code true} then the headless implementation
 526      * of {@code Toolkit} is used,
 527      * otherwise the default platform-specific implementation of
 528      * {@code Toolkit} is used.
 529      * <p>
 530      * If this Toolkit is not a headless implementation and if they exist, service
 531      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 532      * if specified by the system property
 533      * {@code javax.accessibility.assistive_technologies}.
 534      * <p>
 535      * An example of setting this property is to invoke Java with
 536      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 537      * In addition to MyServiceProvider other service providers can be specified
 538      * using a comma separated list.  Service providers are loaded after the AWT
 539      * toolkit is created. All errors are handled via an AWTError exception.
 540      * <p>
 541      * The names specified in the assistive_technologies property are used to query
 542      * each service provider implementation.  If the requested name matches the
 543      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 544      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 545      * matching service provider.
 546      *
 547      * @implSpec
 548      * If assistive technology service providers are not specified with a system
 549      * property this implementation will look in a properties file located as follows:
 550      * <ul>
 551      * <li> {@code ${user.home}/.accessibility.properties}
 552      * <li> {@code ${java.home}/conf/accessibility.properties}
 553      * </ul>
 554      * Only the first of these files to be located will be consulted.  The requested
 555      * service providers are specified by setting the {@code assistive_technologies=}
 556      * property.  A single provider or a comma separated list of providers can be
 557      * specified.
 558      *
 559      * @return     the default toolkit.
 560      * @exception  AWTError  if a toolkit could not be found, or
 561      *                 if one could not be accessed or instantiated.
 562      * @see java.util.ServiceLoader
 563      * @see javax.accessibility.AccessibilityProvider
 564      */
 565     public static synchronized Toolkit getDefaultToolkit() {
 566         if (toolkit == null) {
 567             java.security.AccessController.doPrivileged(
 568                     new java.security.PrivilegedAction<Void>() {
 569                 public Void run() {
 570                     Class<?> cls = null;
 571                     String nm = System.getProperty("awt.toolkit");
 572                     try {
 573                         cls = Class.forName(nm);
 574                     } catch (ClassNotFoundException e) {
 575                         ClassLoader cl = ClassLoader.getSystemClassLoader();
 576                         if (cl != null) {
 577                             try {
 578                                 cls = cl.loadClass(nm);
 579                             } catch (final ClassNotFoundException ignored) {
 580                                 throw new AWTError("Toolkit not found: " + nm);
 581                             }
 582                         }
 583                     }
 584                     try {
 585                         if (cls != null) {
 586                             toolkit = (Toolkit)cls.getConstructor().newInstance();
 587                             if (GraphicsEnvironment.isHeadless()) {
 588                                 toolkit = new HeadlessToolkit(toolkit);
 589                             }
 590                         }
 591                     } catch (final ReflectiveOperationException ignored) {
 592                         throw new AWTError("Could not create Toolkit: " + nm);
 593                     }
 594                     return null;
 595                 }
 596             });
 597             if (!GraphicsEnvironment.isHeadless()) {
 598                 loadAssistiveTechnologies();
 599             }
 600         }
 601         return toolkit;
 602     }
 603 
 604     /**
 605      * Returns an image which gets pixel data from the specified file,
 606      * whose format can be either GIF, JPEG or PNG.
 607      * The underlying toolkit attempts to resolve multiple requests
 608      * with the same filename to the same returned Image.
 609      * <p>
 610      * Since the mechanism required to facilitate this sharing of
 611      * {@code Image} objects may continue to hold onto images
 612      * that are no longer in use for an indefinite period of time,
 613      * developers are encouraged to implement their own caching of
 614      * images by using the {@link #createImage(java.lang.String) createImage}
 615      * variant wherever available.
 616      * If the image data contained in the specified file changes,
 617      * the {@code Image} object returned from this method may
 618      * still contain stale information which was loaded from the
 619      * file after a prior call.
 620      * Previously loaded image data can be manually discarded by
 621      * calling the {@link Image#flush flush} method on the
 622      * returned {@code Image}.
 623      * <p>
 624      * This method first checks if there is a security manager installed.
 625      * If so, the method calls the security manager's
 626      * {@code checkRead} method with the file specified to ensure
 627      * that the access to the image is allowed.
 628      * @param     filename   the name of a file containing pixel data
 629      *                         in a recognized file format.
 630      * @return    an image which gets its pixel data from
 631      *                         the specified file.
 632      * @throws SecurityException  if a security manager exists and its
 633      *                            checkRead method doesn't allow the operation.
 634      * @see #createImage(java.lang.String)
 635      */
 636     public abstract Image getImage(String filename);
 637 
 638     /**
 639      * Returns an image which gets pixel data from the specified URL.
 640      * The pixel data referenced by the specified URL must be in one
 641      * of the following formats: GIF, JPEG or PNG.
 642      * The underlying toolkit attempts to resolve multiple requests
 643      * with the same URL to the same returned Image.
 644      * <p>
 645      * Since the mechanism required to facilitate this sharing of
 646      * {@code Image} objects may continue to hold onto images
 647      * that are no longer in use for an indefinite period of time,
 648      * developers are encouraged to implement their own caching of
 649      * images by using the {@link #createImage(java.net.URL) createImage}
 650      * variant wherever available.
 651      * If the image data stored at the specified URL changes,
 652      * the {@code Image} object returned from this method may
 653      * still contain stale information which was fetched from the
 654      * URL after a prior call.
 655      * Previously loaded image data can be manually discarded by
 656      * calling the {@link Image#flush flush} method on the
 657      * returned {@code Image}.
 658      * <p>
 659      * This method first checks if there is a security manager installed.
 660      * If so, the method calls the security manager's
 661      * {@code checkPermission} method with the corresponding
 662      * permission to ensure that the access to the image is allowed.
 663      * If the connection to the specified URL requires
 664      * either {@code URLPermission} or {@code SocketPermission},
 665      * then {@code URLPermission} is used for security checks.
 666      * For compatibility with pre-1.2 security managers, if the access
 667      * is denied with {@code FilePermission} or {@code SocketPermission},
 668      * the method throws the {@code SecurityException}
 669      * if the corresponding 1.1-style SecurityManager.checkXXX method
 670      * also denies permission.
 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      * For compatibility with pre-1.2 security managers, if the access
 713      * is denied with {@code FilePermission} or {@code SocketPermission},
 714      * the method throws {@code SecurityException}
 715      * if the corresponding 1.1-style SecurityManager.checkXXX method
 716      * also denies permission.
 717      * @param     url   the URL to use in fetching the pixel data.
 718      * @return    an image which gets its pixel data from
 719      *                         the specified URL.
 720      * @throws SecurityException  if a security manager exists and its
 721      *                            checkPermission method doesn't allow
 722      *                            the operation.
 723      * @see #getImage(java.net.URL)
 724      */
 725     public abstract Image createImage(URL url);
 726 
 727     /**
 728      * Prepares an image for rendering.
 729      * <p>
 730      * If the values of the width and height arguments are both
 731      * {@code -1}, this method prepares the image for rendering
 732      * on the default screen; otherwise, this method prepares an image
 733      * for rendering on the default screen at the specified width and height.
 734      * <p>
 735      * The image data is downloaded asynchronously in another thread,
 736      * and an appropriately scaled screen representation of the image is
 737      * generated.
 738      * <p>
 739      * This method is called by components {@code prepareImage}
 740      * methods.
 741      * <p>
 742      * Information on the flags returned by this method can be found
 743      * with the definition of the {@code ImageObserver} interface.
 744 
 745      * @param     image      the image for which to prepare a
 746      *                           screen representation.
 747      * @param     width      the width of the desired screen
 748      *                           representation, or {@code -1}.
 749      * @param     height     the height of the desired screen
 750      *                           representation, or {@code -1}.
 751      * @param     observer   the {@code ImageObserver}
 752      *                           object to be notified as the
 753      *                           image is being prepared.
 754      * @return    {@code true} if the image has already been
 755      *                 fully prepared; {@code false} otherwise.
 756      * @see       java.awt.Component#prepareImage(java.awt.Image,
 757      *                 java.awt.image.ImageObserver)
 758      * @see       java.awt.Component#prepareImage(java.awt.Image,
 759      *                 int, int, java.awt.image.ImageObserver)
 760      * @see       java.awt.image.ImageObserver
 761      */
 762     public abstract boolean prepareImage(Image image, int width, int height,
 763                                          ImageObserver observer);
 764 
 765     /**
 766      * Indicates the construction status of a specified image that is
 767      * being prepared for display.
 768      * <p>
 769      * If the values of the width and height arguments are both
 770      * {@code -1}, this method returns the construction status of
 771      * a screen representation of the specified image in this toolkit.
 772      * Otherwise, this method returns the construction status of a
 773      * scaled representation of the image at the specified width
 774      * and height.
 775      * <p>
 776      * This method does not cause the image to begin loading.
 777      * An application must call {@code prepareImage} to force
 778      * the loading of an image.
 779      * <p>
 780      * This method is called by the component's {@code checkImage}
 781      * methods.
 782      * <p>
 783      * Information on the flags returned by this method can be found
 784      * with the definition of the {@code ImageObserver} interface.
 785      * @param     image   the image whose status is being checked.
 786      * @param     width   the width of the scaled version whose status is
 787      *                 being checked, or {@code -1}.
 788      * @param     height  the height of the scaled version whose status
 789      *                 is being checked, or {@code -1}.
 790      * @param     observer   the {@code ImageObserver} object to be
 791      *                 notified as the image is being prepared.
 792      * @return    the bitwise inclusive <strong>OR</strong> of the
 793      *                 {@code ImageObserver} flags for the
 794      *                 image data that is currently available.
 795      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 796      *                 int, int, java.awt.image.ImageObserver)
 797      * @see       java.awt.Component#checkImage(java.awt.Image,
 798      *                 java.awt.image.ImageObserver)
 799      * @see       java.awt.Component#checkImage(java.awt.Image,
 800      *                 int, int, java.awt.image.ImageObserver)
 801      * @see       java.awt.image.ImageObserver
 802      */
 803     public abstract int checkImage(Image image, int width, int height,
 804                                    ImageObserver observer);
 805 
 806     /**
 807      * Creates an image with the specified image producer.
 808      * @param     producer the image producer to be used.
 809      * @return    an image with the specified image producer.
 810      * @see       java.awt.Image
 811      * @see       java.awt.image.ImageProducer
 812      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 813      */
 814     public abstract Image createImage(ImageProducer producer);
 815 
 816     /**
 817      * Creates an image which decodes the image stored in the specified
 818      * byte array.
 819      * <p>
 820      * The data must be in some image format, such as GIF or JPEG,
 821      * that is supported by this toolkit.
 822      * @param     imagedata   an array of bytes, representing
 823      *                         image data in a supported image format.
 824      * @return    an image.
 825      * @since     1.1
 826      */
 827     public Image createImage(byte[] imagedata) {
 828         return createImage(imagedata, 0, imagedata.length);
 829     }
 830 
 831     /**
 832      * Creates an image which decodes the image stored in the specified
 833      * byte array, and at the specified offset and length.
 834      * The data must be in some image format, such as GIF or JPEG,
 835      * that is supported by this toolkit.
 836      * @param     imagedata   an array of bytes, representing
 837      *                         image data in a supported image format.
 838      * @param     imageoffset  the offset of the beginning
 839      *                         of the data in the array.
 840      * @param     imagelength  the length of the data in the array.
 841      * @return    an image.
 842      * @since     1.1
 843      */
 844     public abstract Image createImage(byte[] imagedata,
 845                                       int imageoffset,
 846                                       int imagelength);
 847 
 848     /**
 849      * Gets a {@code PrintJob} object which is the result of initiating
 850      * a print operation on the toolkit's platform.
 851      * <p>
 852      * Each actual implementation of this method should first check if there
 853      * is a security manager installed. If there is, the method should call
 854      * the security manager's {@code checkPrintJobAccess} method to
 855      * ensure initiation of a print operation is allowed. If the default
 856      * implementation of {@code checkPrintJobAccess} is used (that is,
 857      * that method is not overriden), then this results in a call to the
 858      * security manager's {@code checkPermission} method with a
 859      * {@code RuntimePermission("queuePrintJob")} permission.
 860      *
 861      * @param   frame the parent of the print dialog. May not be null.
 862      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 863      *          to "".
 864      * @param   props a Properties object containing zero or more properties.
 865      *          Properties are not standardized and are not consistent across
 866      *          implementations. Because of this, PrintJobs which require job
 867      *          and page control should use the version of this function which
 868      *          takes JobAttributes and PageAttributes objects. This object
 869      *          may be updated to reflect the user's job choices on exit. May
 870      *          be null.
 871      * @return  a {@code PrintJob} object, or {@code null} if the
 872      *          user cancelled the print job.
 873      * @throws  NullPointerException if frame is null
 874      * @throws  SecurityException if this thread is not allowed to initiate a
 875      *          print job request
 876      * @see     java.awt.GraphicsEnvironment#isHeadless
 877      * @see     java.awt.PrintJob
 878      * @see     java.lang.RuntimePermission
 879      * @since   1.1
 880      */
 881     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 882                                          Properties props);
 883 
 884     /**
 885      * Gets a {@code PrintJob} object which is the result of initiating
 886      * a print operation on the toolkit's platform.
 887      * <p>
 888      * Each actual implementation of this method should first check if there
 889      * is a security manager installed. If there is, the method should call
 890      * the security manager's {@code checkPrintJobAccess} method to
 891      * ensure initiation of a print operation is allowed. If the default
 892      * implementation of {@code checkPrintJobAccess} is used (that is,
 893      * that method is not overriden), then this results in a call to the
 894      * security manager's {@code checkPermission} method with a
 895      * {@code RuntimePermission("queuePrintJob")} permission.
 896      *
 897      * @param   frame the parent of the print dialog. May not be null.
 898      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 899      *          to "".
 900      * @param   jobAttributes a set of job attributes which will control the
 901      *          PrintJob. The attributes will be updated to reflect the user's
 902      *          choices as outlined in the JobAttributes documentation. May be
 903      *          null.
 904      * @param   pageAttributes a set of page attributes which will control the
 905      *          PrintJob. The attributes will be applied to every page in the
 906      *          job. The attributes will be updated to reflect the user's
 907      *          choices as outlined in the PageAttributes documentation. May be
 908      *          null.
 909      * @return  a {@code PrintJob} object, or {@code null} if the
 910      *          user cancelled the print job.
 911      * @throws  NullPointerException if frame is null
 912      * @throws  IllegalArgumentException if pageAttributes specifies differing
 913      *          cross feed and feed resolutions. Also if this thread has
 914      *          access to the file system and jobAttributes specifies
 915      *          print to file, and the specified destination file exists but
 916      *          is a directory rather than a regular file, does not exist but
 917      *          cannot be created, or cannot be opened for any other reason.
 918      *          However in the case of print to file, if a dialog is also
 919      *          requested to be displayed then the user will be given an
 920      *          opportunity to select a file and proceed with printing.
 921      *          The dialog will ensure that the selected output file
 922      *          is valid before returning from this method.
 923      * @throws  SecurityException if this thread is not allowed to initiate a
 924      *          print job request, or if jobAttributes specifies print to file,
 925      *          and this thread is not allowed to access the file system
 926      * @see     java.awt.PrintJob
 927      * @see     java.awt.GraphicsEnvironment#isHeadless
 928      * @see     java.lang.RuntimePermission
 929      * @see     java.awt.JobAttributes
 930      * @see     java.awt.PageAttributes
 931      * @since   1.3
 932      */
 933     public PrintJob getPrintJob(Frame frame, String jobtitle,
 934                                 JobAttributes jobAttributes,
 935                                 PageAttributes pageAttributes) {
 936         // Override to add printing support with new job/page control classes
 937 
 938         if (this != Toolkit.getDefaultToolkit()) {
 939             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 940                                                            jobAttributes,
 941                                                            pageAttributes);
 942         } else {
 943             return getPrintJob(frame, jobtitle, null);
 944         }
 945     }
 946 
 947     /**
 948      * Emits an audio beep depending on native system settings and hardware
 949      * capabilities.
 950      * @since     1.1
 951      */
 952     public abstract void beep();
 953 
 954     /**
 955      * Gets the singleton instance of the system Clipboard which interfaces
 956      * with clipboard facilities provided by the native platform. This
 957      * clipboard enables data transfer between Java programs and native
 958      * applications which use native clipboard facilities.
 959      * <p>
 960      * In addition to any and all default formats text returned by the system
 961      * Clipboard's {@code getTransferData()} method is available in the
 962      * following flavors:
 963      * <ul>
 964      * <li>DataFlavor.stringFlavor</li>
 965      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 966      * </ul>
 967      * As with {@code java.awt.datatransfer.StringSelection}, if the
 968      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 969      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 970      * the system Clipboard's {@code getTransferData()} method for
 971      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 972      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 973      * Because of this, support for
 974      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 975      * <b>deprecated</b>.
 976      * <p>
 977      * Each actual implementation of this method should first check if there
 978      * is a security manager installed. If there is, the method should call
 979      * the security manager's {@link SecurityManager#checkPermission
 980      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 981      *
 982      * @return    the system Clipboard
 983      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 984      * returns true
 985      * @see       java.awt.GraphicsEnvironment#isHeadless
 986      * @see       java.awt.datatransfer.Clipboard
 987      * @see       java.awt.datatransfer.StringSelection
 988      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
 989      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
 990      * @see       java.io.Reader
 991      * @see       java.awt.AWTPermission
 992      * @since     1.1
 993      */
 994     public abstract Clipboard getSystemClipboard()
 995         throws HeadlessException;
 996 
 997     /**
 998      * Gets the singleton instance of the system selection as a
 999      * {@code Clipboard} object. This allows an application to read and
1000      * modify the current, system-wide selection.
1001      * <p>
1002      * An application is responsible for updating the system selection whenever
1003      * the user selects text, using either the mouse or the keyboard.
1004      * Typically, this is implemented by installing a
1005      * {@code FocusListener} on all {@code Component}s which support
1006      * text selection, and, between {@code FOCUS_GAINED} and
1007      * {@code FOCUS_LOST} events delivered to that {@code Component},
1008      * updating the system selection {@code Clipboard} when the selection
1009      * changes inside the {@code Component}. Properly updating the system
1010      * selection ensures that a Java application will interact correctly with
1011      * native applications and other Java applications running simultaneously
1012      * on the system. Note that {@code java.awt.TextComponent} and
1013      * {@code javax.swing.text.JTextComponent} already adhere to this
1014      * policy. When using these classes, and their subclasses, developers need
1015      * not write any additional code.
1016      * <p>
1017      * Some platforms do not support a system selection {@code Clipboard}.
1018      * On those platforms, this method will return {@code null}. In such a
1019      * case, an application is absolved from its responsibility to update the
1020      * system selection {@code Clipboard} as described above.
1021      * <p>
1022      * Each actual implementation of this method should first check if there
1023      * is a security manager installed. If there is, the method should call
1024      * the security manager's {@link SecurityManager#checkPermission
1025      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1026      *
1027      * @return the system selection as a {@code Clipboard}, or
1028      *         {@code null} if the native platform does not support a
1029      *         system selection {@code Clipboard}
1030      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1031      *            returns true
1032      *
1033      * @see java.awt.datatransfer.Clipboard
1034      * @see java.awt.event.FocusListener
1035      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1036      * @see java.awt.event.FocusEvent#FOCUS_LOST
1037      * @see TextComponent
1038      * @see javax.swing.text.JTextComponent
1039      * @see AWTPermission
1040      * @see GraphicsEnvironment#isHeadless
1041      * @since 1.4
1042      */
1043     public Clipboard getSystemSelection() throws HeadlessException {
1044         GraphicsEnvironment.checkHeadless();
1045 
1046         if (this != Toolkit.getDefaultToolkit()) {
1047             return Toolkit.getDefaultToolkit().getSystemSelection();
1048         } else {
1049             GraphicsEnvironment.checkHeadless();
1050             return null;
1051         }
1052     }
1053 
1054     /**
1055      * Determines which modifier key is the appropriate accelerator
1056      * key for menu shortcuts.
1057      * <p>
1058      * Menu shortcuts, which are embodied in the
1059      * {@code MenuShortcut} class, are handled by the
1060      * {@code MenuBar} class.
1061      * <p>
1062      * By default, this method returns {@code Event.CTRL_MASK}.
1063      * Toolkit implementations should override this method if the
1064      * <b>Control</b> key isn't the correct key for accelerators.
1065      * @return    the modifier mask on the {@code Event} class
1066      *                 that is used for menu shortcuts on this toolkit.
1067      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1068      * returns true
1069      * @see       java.awt.GraphicsEnvironment#isHeadless
1070      * @see       java.awt.MenuBar
1071      * @see       java.awt.MenuShortcut
1072      * @since     1.1
1073      */
1074     @SuppressWarnings("deprecation")
1075     public int getMenuShortcutKeyMask() throws HeadlessException {
1076         GraphicsEnvironment.checkHeadless();
1077 
1078         return Event.CTRL_MASK;
1079     }
1080 
1081     /**
1082      * Returns whether the given locking key on the keyboard is currently in
1083      * its "on" state.
1084      * Valid key codes are
1085      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1086      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1087      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1088      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1089      *
1090      * @param  keyCode the key code
1091      * @return {@code true} if the given key is currently in its "on" state;
1092      *          otherwise {@code false}
1093      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1094      * is not one of the valid key codes
1095      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1096      * allow getting the state of this key programmatically, or if the keyboard
1097      * doesn't have this key
1098      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1099      * returns true
1100      * @see       java.awt.GraphicsEnvironment#isHeadless
1101      * @since 1.3
1102      */
1103     public boolean getLockingKeyState(int keyCode)
1104         throws UnsupportedOperationException
1105     {
1106         GraphicsEnvironment.checkHeadless();
1107 
1108         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1109                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1110             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1111         }
1112         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1113     }
1114 
1115     /**
1116      * Sets the state of the given locking key on the keyboard.
1117      * Valid key codes are
1118      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1119      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1120      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1121      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1122      * <p>
1123      * Depending on the platform, setting the state of a locking key may
1124      * involve event processing and therefore may not be immediately
1125      * observable through getLockingKeyState.
1126      *
1127      * @param  keyCode the key code
1128      * @param  on the state of the key
1129      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1130      * is not one of the valid key codes
1131      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1132      * allow setting the state of this key programmatically, or if the keyboard
1133      * doesn't have this key
1134      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1135      * returns true
1136      * @see       java.awt.GraphicsEnvironment#isHeadless
1137      * @since 1.3
1138      */
1139     public void setLockingKeyState(int keyCode, boolean on)
1140         throws UnsupportedOperationException
1141     {
1142         GraphicsEnvironment.checkHeadless();
1143 
1144         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1145                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1146             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1147         }
1148         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1149     }
1150 
1151     /**
1152      * Give native peers the ability to query the native container
1153      * given a native component (eg the direct parent may be lightweight).
1154      *
1155      * @param  c the component to fetch the container for
1156      * @return the native container object for the component
1157      */
1158     protected static Container getNativeContainer(Component c) {
1159         return c.getNativeContainer();
1160     }
1161 
1162     /**
1163      * Creates a new custom cursor object.
1164      * If the image to display is invalid, the cursor will be hidden (made
1165      * completely transparent), and the hotspot will be set to (0, 0).
1166      *
1167      * <p>Note that multi-frame images are invalid and may cause this
1168      * method to hang.
1169      *
1170      * @param cursor the image to display when the cursor is activated
1171      * @param hotSpot the X and Y of the large cursor's hot spot; the
1172      *   hotSpot values must be less than the Dimension returned by
1173      *   {@code getBestCursorSize}
1174      * @param     name a localized description of the cursor, for Java Accessibility use
1175      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1176      *   the bounds of the cursor
1177      * @return the cursor created
1178      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1179      * returns true
1180      * @see       java.awt.GraphicsEnvironment#isHeadless
1181      * @since     1.2
1182      */
1183     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1184         throws IndexOutOfBoundsException, HeadlessException
1185     {
1186         // Override to implement custom cursor support.
1187         if (this != Toolkit.getDefaultToolkit()) {
1188             return Toolkit.getDefaultToolkit().
1189                 createCustomCursor(cursor, hotSpot, name);
1190         } else {
1191             return new Cursor(Cursor.DEFAULT_CURSOR);
1192         }
1193     }
1194 
1195     /**
1196      * Returns the supported cursor dimension which is closest to the desired
1197      * sizes.  Systems which only support a single cursor size will return that
1198      * size regardless of the desired sizes.  Systems which don't support custom
1199      * cursors will return a dimension of 0, 0. <p>
1200      * Note:  if an image is used whose dimensions don't match a supported size
1201      * (as returned by this method), the Toolkit implementation will attempt to
1202      * resize the image to a supported size.
1203      * Since converting low-resolution images is difficult,
1204      * no guarantees are made as to the quality of a cursor image which isn't a
1205      * supported size.  It is therefore recommended that this method
1206      * be called and an appropriate image used so no image conversion is made.
1207      *
1208      * @param     preferredWidth the preferred cursor width the component would like
1209      * to use.
1210      * @param     preferredHeight the preferred cursor height the component would like
1211      * to use.
1212      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1213      * the Toolkit implementation doesn't support custom cursors.
1214      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1215      * returns true
1216      * @see       java.awt.GraphicsEnvironment#isHeadless
1217      * @since     1.2
1218      */
1219     public Dimension getBestCursorSize(int preferredWidth,
1220         int preferredHeight) throws HeadlessException {
1221         GraphicsEnvironment.checkHeadless();
1222 
1223         // Override to implement custom cursor support.
1224         if (this != Toolkit.getDefaultToolkit()) {
1225             return Toolkit.getDefaultToolkit().
1226                 getBestCursorSize(preferredWidth, preferredHeight);
1227         } else {
1228             return new Dimension(0, 0);
1229         }
1230     }
1231 
1232     /**
1233      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1234      * palette.<p>
1235      * Note: if an image is used which has more colors in its palette than
1236      * the supported maximum, the Toolkit implementation will attempt to flatten the
1237      * palette to the maximum.  Since converting low-resolution images is difficult,
1238      * no guarantees are made as to the quality of a cursor image which has more
1239      * colors than the system supports.  It is therefore recommended that this method
1240      * be called and an appropriate image used so no image conversion is made.
1241      *
1242      * @return    the maximum number of colors, or zero if custom cursors are not
1243      * supported by this Toolkit implementation.
1244      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1245      * returns true
1246      * @see       java.awt.GraphicsEnvironment#isHeadless
1247      * @since     1.2
1248      */
1249     public int getMaximumCursorColors() throws HeadlessException {
1250         GraphicsEnvironment.checkHeadless();
1251 
1252         // Override to implement custom cursor support.
1253         if (this != Toolkit.getDefaultToolkit()) {
1254             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1255         } else {
1256             return 0;
1257         }
1258     }
1259 
1260     /**
1261      * Returns whether Toolkit supports this state for
1262      * {@code Frame}s.  This method tells whether the <em>UI
1263      * concept</em> of, say, maximization or iconification is
1264      * supported.  It will always return false for "compound" states
1265      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1266      * In other words, the rule of thumb is that only queries with a
1267      * single frame state constant as an argument are meaningful.
1268      * <p>Note that supporting a given concept is a platform-
1269      * dependent feature. Due to native limitations the Toolkit
1270      * object may report a particular state as supported, however at
1271      * the same time the Toolkit object will be unable to apply the
1272      * state to a given frame.  This circumstance has two following
1273      * consequences:
1274      * <ul>
1275      * <li>Only the return value of {@code false} for the present
1276      * method actually indicates that the given state is not
1277      * supported. If the method returns {@code true} the given state
1278      * may still be unsupported and/or unavailable for a particular
1279      * frame.
1280      * <li>The developer should consider examining the value of the
1281      * {@link java.awt.event.WindowEvent#getNewState} method of the
1282      * {@code WindowEvent} received through the {@link
1283      * java.awt.event.WindowStateListener}, rather than assuming
1284      * that the state given to the {@code setExtendedState()} method
1285      * will be definitely applied. For more information see the
1286      * documentation for the {@link Frame#setExtendedState} method.
1287      * </ul>
1288      *
1289      * @param state one of named frame state constants.
1290      * @return {@code true} is this frame state is supported by
1291      *     this Toolkit implementation, {@code false} otherwise.
1292      * @exception HeadlessException
1293      *     if {@code GraphicsEnvironment.isHeadless()}
1294      *     returns {@code true}.
1295      * @see java.awt.Window#addWindowStateListener
1296      * @since   1.4
1297      */
1298     public boolean isFrameStateSupported(int state)
1299         throws HeadlessException
1300     {
1301         GraphicsEnvironment.checkHeadless();
1302 
1303         if (this != Toolkit.getDefaultToolkit()) {
1304             return Toolkit.getDefaultToolkit().
1305                 isFrameStateSupported(state);
1306         } else {
1307             return (state == Frame.NORMAL); // others are not guaranteed
1308         }
1309     }
1310 
1311     /**
1312      * Support for I18N: any visible strings should be stored in
1313      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1314      * here, so that only one copy is maintained.
1315      */
1316     private static ResourceBundle resources;
1317     private static ResourceBundle platformResources;
1318 
1319     // called by platform toolkit
1320     private static void setPlatformResources(ResourceBundle bundle) {
1321         platformResources = bundle;
1322     }
1323 
1324     /**
1325      * Initialize JNI field and method ids
1326      */
1327     private static native void initIDs();
1328 
1329     /**
1330      * WARNING: This is a temporary workaround for a problem in the
1331      * way the AWT loads native libraries. A number of classes in the
1332      * AWT package have a native method, initIDs(), which initializes
1333      * the JNI field and method ids used in the native portion of
1334      * their implementation.
1335      *
1336      * Since the use and storage of these ids is done by the
1337      * implementation libraries, the implementation of these method is
1338      * provided by the particular AWT implementations (for example,
1339      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1340      * problem is that this means that the native libraries must be
1341      * loaded by the java.* classes, which do not necessarily know the
1342      * names of the libraries to load. A better way of doing this
1343      * would be to provide a separate library which defines java.awt.*
1344      * initIDs, and exports the relevant symbols out to the
1345      * implementation libraries.
1346      *
1347      * For now, we know it's done by the implementation, and we assume
1348      * that the name of the library is "awt".  -br.
1349      *
1350      * If you change loadLibraries(), please add the change to
1351      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1352      * classes can be loaded in java.awt.image that depend on
1353      * libawt and there is no way to call Toolkit.loadLibraries()
1354      * directly.  -hung
1355      */
1356     private static boolean loaded = false;
1357     static void loadLibraries() {
1358         if (!loaded) {
1359             java.security.AccessController.doPrivileged(
1360                 new java.security.PrivilegedAction<Void>() {
1361                     public Void run() {
1362                         System.loadLibrary("awt");
1363                         return null;
1364                     }
1365                 });
1366             loaded = true;
1367         }
1368     }
1369 
1370     static {
1371         AWTAccessor.setToolkitAccessor(
1372                 new AWTAccessor.ToolkitAccessor() {
1373                     @Override
1374                     public void setPlatformResources(ResourceBundle bundle) {
1375                         Toolkit.setPlatformResources(bundle);
1376                     }
1377                 });
1378 
1379         java.security.AccessController.doPrivileged(
1380                                  new java.security.PrivilegedAction<Void>() {
1381             public Void run() {
1382                 try {
1383                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1384                 } catch (MissingResourceException e) {
1385                     // No resource file; defaults will be used.
1386                 }
1387                 return null;
1388             }
1389         });
1390 
1391         // ensure that the proper libraries are loaded
1392         loadLibraries();
1393         initAssistiveTechnologies();
1394         initIDs();
1395     }
1396 
1397     /**
1398      * Gets a property with the specified key and default.
1399      * This method returns defaultValue if the property is not found.
1400      *
1401      * @param  key the key
1402      * @param  defaultValue the default value
1403      * @return the value of the property or the default value
1404      *         if the property was not found
1405      */
1406     public static String getProperty(String key, String defaultValue) {
1407         // first try platform specific bundle
1408         if (platformResources != null) {
1409             try {
1410                 return platformResources.getString(key);
1411             }
1412             catch (MissingResourceException e) {}
1413         }
1414 
1415         // then shared one
1416         if (resources != null) {
1417             try {
1418                 return resources.getString(key);
1419             }
1420             catch (MissingResourceException e) {}
1421         }
1422 
1423         return defaultValue;
1424     }
1425 
1426     /**
1427      * Get the application's or applet's EventQueue instance.
1428      * Depending on the Toolkit implementation, different EventQueues
1429      * may be returned for different applets.  Applets should
1430      * therefore not assume that the EventQueue instance returned
1431      * by this method will be shared by other applets or the system.
1432      *
1433      * <p> If there is a security manager then its
1434      * {@link SecurityManager#checkPermission checkPermission} method
1435      * is called to check {@code AWTPermission("accessEventQueue")}.
1436      *
1437      * @return    the {@code EventQueue} object
1438      * @throws  SecurityException
1439      *          if a security manager is set and it denies access to
1440      *          the {@code EventQueue}
1441      * @see     java.awt.AWTPermission
1442     */
1443     public final EventQueue getSystemEventQueue() {
1444         SecurityManager security = System.getSecurityManager();
1445         if (security != null) {
1446             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1447         }
1448         return getSystemEventQueueImpl();
1449     }
1450 
1451     /**
1452      * Gets the application's or applet's {@code EventQueue}
1453      * instance, without checking access.  For security reasons,
1454      * this can only be called from a {@code Toolkit} subclass.
1455      * @return the {@code EventQueue} object
1456      */
1457     protected abstract EventQueue getSystemEventQueueImpl();
1458 
1459     /* Accessor method for use by AWT package routines. */
1460     static EventQueue getEventQueue() {
1461         return getDefaultToolkit().getSystemEventQueueImpl();
1462     }
1463 
1464     /**
1465      * Creates a concrete, platform dependent, subclass of the abstract
1466      * DragGestureRecognizer class requested, and associates it with the
1467      * DragSource, Component and DragGestureListener specified.
1468      *
1469      * subclasses should override this to provide their own implementation
1470      *
1471      * @param <T> the type of DragGestureRecognizer to create
1472      * @param abstractRecognizerClass The abstract class of the required recognizer
1473      * @param ds                      The DragSource
1474      * @param c                       The Component target for the DragGestureRecognizer
1475      * @param srcActions              The actions permitted for the gesture
1476      * @param dgl                     The DragGestureListener
1477      *
1478      * @return the new object or null.  Always returns null if
1479      * GraphicsEnvironment.isHeadless() returns true.
1480      * @see java.awt.GraphicsEnvironment#isHeadless
1481      */
1482     public <T extends DragGestureRecognizer> T
1483         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1484                                     DragSource ds, Component c, int srcActions,
1485                                     DragGestureListener dgl)
1486     {
1487         return null;
1488     }
1489 
1490     /**
1491      * Obtains a value for the specified desktop property.
1492      *
1493      * A desktop property is a uniquely named value for a resource that
1494      * is Toolkit global in nature. Usually it also is an abstract
1495      * representation for an underlying platform dependent desktop setting.
1496      * For more information on desktop properties supported by the AWT see
1497      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1498      *
1499      * @param  propertyName the property name
1500      * @return the value for the specified desktop property
1501      */
1502     public final synchronized Object getDesktopProperty(String propertyName) {
1503         // This is a workaround for headless toolkits.  It would be
1504         // better to override this method but it is declared final.
1505         // "this instanceof" syntax defeats polymorphism.
1506         // --mm, 03/03/00
1507         if (this instanceof HeadlessToolkit) {
1508             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1509                 .getDesktopProperty(propertyName);
1510         }
1511 
1512         if (desktopProperties.isEmpty()) {
1513             initializeDesktopProperties();
1514         }
1515 
1516         Object value;
1517 
1518         // This property should never be cached
1519         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1520             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1521         }
1522 
1523         value = desktopProperties.get(propertyName);
1524 
1525         if (value == null) {
1526             value = lazilyLoadDesktopProperty(propertyName);
1527 
1528             if (value != null) {
1529                 setDesktopProperty(propertyName, value);
1530             }
1531         }
1532 
1533         /* for property "awt.font.desktophints" */
1534         if (value instanceof RenderingHints) {
1535             value = ((RenderingHints)value).clone();
1536         }
1537 
1538         return value;
1539     }
1540 
1541     /**
1542      * Sets the named desktop property to the specified value and fires a
1543      * property change event to notify any listeners that the value has changed.
1544      *
1545      * @param  name the property name
1546      * @param  newValue the new property value
1547      */
1548     protected final void setDesktopProperty(String name, Object newValue) {
1549         // This is a workaround for headless toolkits.  It would be
1550         // better to override this method but it is declared final.
1551         // "this instanceof" syntax defeats polymorphism.
1552         // --mm, 03/03/00
1553         if (this instanceof HeadlessToolkit) {
1554             ((HeadlessToolkit)this).getUnderlyingToolkit()
1555                 .setDesktopProperty(name, newValue);
1556             return;
1557         }
1558         Object oldValue;
1559 
1560         synchronized (this) {
1561             oldValue = desktopProperties.get(name);
1562             desktopProperties.put(name, newValue);
1563         }
1564 
1565         // Don't fire change event if old and new values are null.
1566         // It helps to avoid recursive resending of WM_THEMECHANGED
1567         if (oldValue != null || newValue != null) {
1568             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1569         }
1570     }
1571 
1572     /**
1573      * An opportunity to lazily evaluate desktop property values.
1574      * @return the desktop property or null
1575      * @param name the name
1576      */
1577     protected Object lazilyLoadDesktopProperty(String name) {
1578         return null;
1579     }
1580 
1581     /**
1582      * initializeDesktopProperties
1583      */
1584     protected void initializeDesktopProperties() {
1585     }
1586 
1587     /**
1588      * Adds the specified property change listener for the named desktop
1589      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1590      * its property name is ignored, and the wrapped listener is added.
1591      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1592      * no exception is thrown and no action is performed.
1593      *
1594      * @param   name The name of the property to listen for
1595      * @param   pcl The property change listener
1596      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1597                 PropertyChangeListener)
1598      * @since   1.2
1599      */
1600     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1601         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1602     }
1603 
1604     /**
1605      * Removes the specified property change listener for the named
1606      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1607      * is removed, its property name is ignored, and
1608      * the wrapped listener is removed.
1609      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1610      * no exception is thrown and no action is performed.
1611      *
1612      * @param   name The name of the property to remove
1613      * @param   pcl The property change listener
1614      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1615                 PropertyChangeListener)
1616      * @since   1.2
1617      */
1618     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1619         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1620     }
1621 
1622     /**
1623      * Returns an array of all the property change listeners
1624      * registered on this toolkit. The returned array
1625      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1626      * that associate listeners with the names of desktop properties.
1627      *
1628      * @return all of this toolkit's {@link PropertyChangeListener}
1629      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1630      *         or an empty array  if no listeners are added
1631      *
1632      * @see PropertyChangeSupport#getPropertyChangeListeners()
1633      * @since 1.4
1634      */
1635     public PropertyChangeListener[] getPropertyChangeListeners() {
1636         return desktopPropsSupport.getPropertyChangeListeners();
1637     }
1638 
1639     /**
1640      * Returns an array of all property change listeners
1641      * associated with the specified name of a desktop property.
1642      *
1643      * @param  propertyName the named property
1644      * @return all of the {@code PropertyChangeListener} objects
1645      *         associated with the specified name of a desktop property
1646      *         or an empty array if no such listeners are added
1647      *
1648      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1649      * @since 1.4
1650      */
1651     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1652         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1653     }
1654 
1655     /**
1656      * The desktop properties.
1657      */
1658     protected final Map<String,Object> desktopProperties =
1659             new HashMap<String,Object>();
1660     /**
1661      * The desktop properties change support.
1662      */
1663     protected final PropertyChangeSupport desktopPropsSupport =
1664             Toolkit.createPropertyChangeSupport(this);
1665 
1666     /**
1667      * Returns whether the always-on-top mode is supported by this toolkit.
1668      * To detect whether the always-on-top mode is supported for a
1669      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1670      * @return {@code true}, if current toolkit supports the always-on-top mode,
1671      *     otherwise returns {@code false}
1672      * @see Window#isAlwaysOnTopSupported
1673      * @see Window#setAlwaysOnTop(boolean)
1674      * @since 1.6
1675      */
1676     public boolean isAlwaysOnTopSupported() {
1677         return true;
1678     }
1679 
1680     /**
1681      * Returns whether the given modality type is supported by this toolkit. If
1682      * a dialog with unsupported modality type is created, then
1683      * {@code Dialog.ModalityType.MODELESS} is used instead.
1684      *
1685      * @param modalityType modality type to be checked for support by this toolkit
1686      *
1687      * @return {@code true}, if current toolkit supports given modality
1688      *     type, {@code false} otherwise
1689      *
1690      * @see java.awt.Dialog.ModalityType
1691      * @see java.awt.Dialog#getModalityType
1692      * @see java.awt.Dialog#setModalityType
1693      *
1694      * @since 1.6
1695      */
1696     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1697 
1698     /**
1699      * Returns whether the given modal exclusion type is supported by this
1700      * toolkit. If an unsupported modal exclusion type property is set on a window,
1701      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1702      *
1703      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1704      *
1705      * @return {@code true}, if current toolkit supports given modal exclusion
1706      *     type, {@code false} otherwise
1707      *
1708      * @see java.awt.Dialog.ModalExclusionType
1709      * @see java.awt.Window#getModalExclusionType
1710      * @see java.awt.Window#setModalExclusionType
1711      *
1712      * @since 1.6
1713      */
1714     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1715 
1716     // 8014718: logging has been removed from SunToolkit
1717 
1718     private static final int LONG_BITS = 64;
1719     private int[] calls = new int[LONG_BITS];
1720     private static volatile long enabledOnToolkitMask;
1721     private AWTEventListener eventListener = null;
1722     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1723 
1724     /*
1725      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1726      * if the listener is proxied.
1727      */
1728     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1729     {
1730         AWTEventListener localL = l;
1731 
1732         if (localL == null) {
1733             return null;
1734         }
1735         // if user passed in a AWTEventListenerProxy object, extract
1736         // the listener
1737         if (l instanceof AWTEventListenerProxy) {
1738             localL = ((AWTEventListenerProxy)l).getListener();
1739         }
1740         return localL;
1741     }
1742 
1743     /**
1744      * Adds an AWTEventListener to receive all AWTEvents dispatched
1745      * system-wide that conform to the given {@code eventMask}.
1746      * <p>
1747      * First, if there is a security manager, its {@code checkPermission}
1748      * method is called with an
1749      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1750      * This may result in a SecurityException.
1751      * <p>
1752      * {@code eventMask} is a bitmask of event types to receive.
1753      * It is constructed by bitwise OR-ing together the event masks
1754      * defined in {@code AWTEvent}.
1755      * <p>
1756      * Note:  event listener use is not recommended for normal
1757      * application use, but are intended solely to support special
1758      * purpose facilities including support for accessibility,
1759      * event record/playback, and diagnostic tracing.
1760      *
1761      * If listener is null, no exception is thrown and no action is performed.
1762      *
1763      * @param    listener   the event listener.
1764      * @param    eventMask  the bitmask of event types to receive
1765      * @throws SecurityException
1766      *        if a security manager exists and its
1767      *        {@code checkPermission} method doesn't allow the operation.
1768      * @see      #removeAWTEventListener
1769      * @see      #getAWTEventListeners
1770      * @see      SecurityManager#checkPermission
1771      * @see      java.awt.AWTEvent
1772      * @see      java.awt.AWTPermission
1773      * @see      java.awt.event.AWTEventListener
1774      * @see      java.awt.event.AWTEventListenerProxy
1775      * @since    1.2
1776      */
1777     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1778         AWTEventListener localL = deProxyAWTEventListener(listener);
1779 
1780         if (localL == null) {
1781             return;
1782         }
1783         SecurityManager security = System.getSecurityManager();
1784         if (security != null) {
1785           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1786         }
1787         synchronized (this) {
1788             SelectiveAWTEventListener selectiveListener =
1789                 listener2SelectiveListener.get(localL);
1790 
1791             if (selectiveListener == null) {
1792                 // Create a new selectiveListener.
1793                 selectiveListener = new SelectiveAWTEventListener(localL,
1794                                                                  eventMask);
1795                 listener2SelectiveListener.put(localL, selectiveListener);
1796                 eventListener = ToolkitEventMulticaster.add(eventListener,
1797                                                             selectiveListener);
1798             }
1799             // OR the eventMask into the selectiveListener's event mask.
1800             selectiveListener.orEventMasks(eventMask);
1801 
1802             enabledOnToolkitMask |= eventMask;
1803 
1804             long mask = eventMask;
1805             for (int i=0; i<LONG_BITS; i++) {
1806                 // If no bits are set, break out of loop.
1807                 if (mask == 0) {
1808                     break;
1809                 }
1810                 if ((mask & 1L) != 0) {  // Always test bit 0.
1811                     calls[i]++;
1812                 }
1813                 mask >>>= 1;  // Right shift, fill with zeros on left.
1814             }
1815         }
1816     }
1817 
1818     /**
1819      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1820      * <p>
1821      * First, if there is a security manager, its {@code checkPermission}
1822      * method is called with an
1823      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1824      * This may result in a SecurityException.
1825      * <p>
1826      * Note:  event listener use is not recommended for normal
1827      * application use, but are intended solely to support special
1828      * purpose facilities including support for accessibility,
1829      * event record/playback, and diagnostic tracing.
1830      *
1831      * If listener is null, no exception is thrown and no action is performed.
1832      *
1833      * @param    listener   the event listener.
1834      * @throws SecurityException
1835      *        if a security manager exists and its
1836      *        {@code checkPermission} method doesn't allow the operation.
1837      * @see      #addAWTEventListener
1838      * @see      #getAWTEventListeners
1839      * @see      SecurityManager#checkPermission
1840      * @see      java.awt.AWTEvent
1841      * @see      java.awt.AWTPermission
1842      * @see      java.awt.event.AWTEventListener
1843      * @see      java.awt.event.AWTEventListenerProxy
1844      * @since    1.2
1845      */
1846     public void removeAWTEventListener(AWTEventListener listener) {
1847         AWTEventListener localL = deProxyAWTEventListener(listener);
1848 
1849         if (listener == null) {
1850             return;
1851         }
1852         SecurityManager security = System.getSecurityManager();
1853         if (security != null) {
1854             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1855         }
1856 
1857         synchronized (this) {
1858             SelectiveAWTEventListener selectiveListener =
1859                 listener2SelectiveListener.get(localL);
1860 
1861             if (selectiveListener != null) {
1862                 listener2SelectiveListener.remove(localL);
1863                 int[] listenerCalls = selectiveListener.getCalls();
1864                 for (int i=0; i<LONG_BITS; i++) {
1865                     calls[i] -= listenerCalls[i];
1866                     assert calls[i] >= 0: "Negative Listeners count";
1867 
1868                     if (calls[i] == 0) {
1869                         enabledOnToolkitMask &= ~(1L<<i);
1870                     }
1871                 }
1872             }
1873             eventListener = ToolkitEventMulticaster.remove(eventListener,
1874             (selectiveListener == null) ? localL : selectiveListener);
1875         }
1876     }
1877 
1878     static boolean enabledOnToolkit(long eventMask) {
1879         return (enabledOnToolkitMask & eventMask) != 0;
1880         }
1881 
1882     synchronized int countAWTEventListeners(long eventMask) {
1883         int ci = 0;
1884         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1885         }
1886         ci--;
1887         return calls[ci];
1888     }
1889     /**
1890      * Returns an array of all the {@code AWTEventListener}s
1891      * registered on this toolkit.
1892      * If there is a security manager, its {@code checkPermission}
1893      * method is called with an
1894      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1895      * This may result in a SecurityException.
1896      * Listeners can be returned
1897      * within {@code AWTEventListenerProxy} objects, which also contain
1898      * the event mask for the given listener.
1899      * Note that listener objects
1900      * added multiple times appear only once in the returned array.
1901      *
1902      * @return all of the {@code AWTEventListener}s or an empty
1903      *         array if no listeners are currently registered
1904      * @throws SecurityException
1905      *        if a security manager exists and its
1906      *        {@code checkPermission} method doesn't allow the operation.
1907      * @see      #addAWTEventListener
1908      * @see      #removeAWTEventListener
1909      * @see      SecurityManager#checkPermission
1910      * @see      java.awt.AWTEvent
1911      * @see      java.awt.AWTPermission
1912      * @see      java.awt.event.AWTEventListener
1913      * @see      java.awt.event.AWTEventListenerProxy
1914      * @since 1.4
1915      */
1916     public AWTEventListener[] getAWTEventListeners() {
1917         SecurityManager security = System.getSecurityManager();
1918         if (security != null) {
1919             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1920         }
1921         synchronized (this) {
1922             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1923 
1924             AWTEventListener[] ret = new AWTEventListener[la.length];
1925             for (int i = 0; i < la.length; i++) {
1926                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1927                 AWTEventListener tempL = sael.getListener();
1928                 //assert tempL is not an AWTEventListenerProxy - we should
1929                 // have weeded them all out
1930                 // don't want to wrap a proxy inside a proxy
1931                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1932             }
1933             return ret;
1934         }
1935     }
1936 
1937     /**
1938      * Returns an array of all the {@code AWTEventListener}s
1939      * registered on this toolkit which listen to all of the event
1940      * types specified in the {@code eventMask} argument.
1941      * If there is a security manager, its {@code checkPermission}
1942      * method is called with an
1943      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1944      * This may result in a SecurityException.
1945      * Listeners can be returned
1946      * within {@code AWTEventListenerProxy} objects, which also contain
1947      * the event mask for the given listener.
1948      * Note that listener objects
1949      * added multiple times appear only once in the returned array.
1950      *
1951      * @param  eventMask the bitmask of event types to listen for
1952      * @return all of the {@code AWTEventListener}s registered
1953      *         on this toolkit for the specified
1954      *         event types, or an empty array if no such listeners
1955      *         are currently registered
1956      * @throws SecurityException
1957      *        if a security manager exists and its
1958      *        {@code checkPermission} method doesn't allow the operation.
1959      * @see      #addAWTEventListener
1960      * @see      #removeAWTEventListener
1961      * @see      SecurityManager#checkPermission
1962      * @see      java.awt.AWTEvent
1963      * @see      java.awt.AWTPermission
1964      * @see      java.awt.event.AWTEventListener
1965      * @see      java.awt.event.AWTEventListenerProxy
1966      * @since 1.4
1967      */
1968     public AWTEventListener[] getAWTEventListeners(long eventMask) {
1969         SecurityManager security = System.getSecurityManager();
1970         if (security != null) {
1971             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1972         }
1973         synchronized (this) {
1974             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1975 
1976             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
1977 
1978             for (int i = 0; i < la.length; i++) {
1979                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1980                 if ((sael.getEventMask() & eventMask) == eventMask) {
1981                     //AWTEventListener tempL = sael.getListener();
1982                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
1983                                                        sael.getListener()));
1984                 }
1985             }
1986             return list.toArray(new AWTEventListener[0]);
1987         }
1988     }
1989 
1990     /*
1991      * This method notifies any AWTEventListeners that an event
1992      * is about to be dispatched.
1993      *
1994      * @param theEvent the event which will be dispatched.
1995      */
1996     void notifyAWTEventListeners(AWTEvent theEvent) {
1997         // This is a workaround for headless toolkits.  It would be
1998         // better to override this method but it is declared package private.
1999         // "this instanceof" syntax defeats polymorphism.
2000         // --mm, 03/03/00
2001         if (this instanceof HeadlessToolkit) {
2002             ((HeadlessToolkit)this).getUnderlyingToolkit()
2003                 .notifyAWTEventListeners(theEvent);
2004             return;
2005         }
2006 
2007         AWTEventListener eventListener = this.eventListener;
2008         if (eventListener != null) {
2009             eventListener.eventDispatched(theEvent);
2010         }
2011     }
2012 
2013     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2014         implements AWTEventListener {
2015         // Implementation cloned from AWTEventMulticaster.
2016 
2017         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2018             super(a, b);
2019         }
2020 
2021         @SuppressWarnings("overloads")
2022         static AWTEventListener add(AWTEventListener a,
2023                                     AWTEventListener b) {
2024             if (a == null)  return b;
2025             if (b == null)  return a;
2026             return new ToolkitEventMulticaster(a, b);
2027         }
2028 
2029         @SuppressWarnings("overloads")
2030         static AWTEventListener remove(AWTEventListener l,
2031                                        AWTEventListener oldl) {
2032             return (AWTEventListener) removeInternal(l, oldl);
2033         }
2034 
2035         // #4178589: must overload remove(EventListener) to call our add()
2036         // instead of the static addInternal() so we allocate a
2037         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2038         // Note: this method is called by AWTEventListener.removeInternal(),
2039         // so its method signature must match AWTEventListener.remove().
2040         protected EventListener remove(EventListener oldl) {
2041             if (oldl == a)  return b;
2042             if (oldl == b)  return a;
2043             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2044             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2045             if (a2 == a && b2 == b) {
2046                 return this;    // it's not here
2047             }
2048             return add(a2, b2);
2049         }
2050 
2051         public void eventDispatched(AWTEvent event) {
2052             ((AWTEventListener)a).eventDispatched(event);
2053             ((AWTEventListener)b).eventDispatched(event);
2054         }
2055     }
2056 
2057     private class SelectiveAWTEventListener implements AWTEventListener {
2058         AWTEventListener listener;
2059         private long eventMask;
2060         // This array contains the number of times to call the eventlistener
2061         // for each event type.
2062         int[] calls = new int[Toolkit.LONG_BITS];
2063 
2064         public AWTEventListener getListener() {return listener;}
2065         public long getEventMask() {return eventMask;}
2066         public int[] getCalls() {return calls;}
2067 
2068         public void orEventMasks(long mask) {
2069             eventMask |= mask;
2070             // For each event bit set in mask, increment its call count.
2071             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2072                 // If no bits are set, break out of loop.
2073                 if (mask == 0) {
2074                     break;
2075                 }
2076                 if ((mask & 1L) != 0) {  // Always test bit 0.
2077                     calls[i]++;
2078                 }
2079                 mask >>>= 1;  // Right shift, fill with zeros on left.
2080             }
2081         }
2082 
2083         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2084             listener = l;
2085             eventMask = mask;
2086         }
2087 
2088         public void eventDispatched(AWTEvent event) {
2089             long eventBit = 0; // Used to save the bit of the event type.
2090             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2091                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2092                  event.id <= ComponentEvent.COMPONENT_LAST)
2093              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2094                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2095                  event.id <= ContainerEvent.CONTAINER_LAST)
2096              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2097                  event.id >= FocusEvent.FOCUS_FIRST &&
2098                  event.id <= FocusEvent.FOCUS_LAST)
2099              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2100                  event.id >= KeyEvent.KEY_FIRST &&
2101                  event.id <= KeyEvent.KEY_LAST)
2102              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2103                  event.id == MouseEvent.MOUSE_WHEEL)
2104              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2105                  (event.id == MouseEvent.MOUSE_MOVED ||
2106                   event.id == MouseEvent.MOUSE_DRAGGED))
2107              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2108                  event.id != MouseEvent.MOUSE_MOVED &&
2109                  event.id != MouseEvent.MOUSE_DRAGGED &&
2110                  event.id != MouseEvent.MOUSE_WHEEL &&
2111                  event.id >= MouseEvent.MOUSE_FIRST &&
2112                  event.id <= MouseEvent.MOUSE_LAST)
2113              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2114                  (event.id >= WindowEvent.WINDOW_FIRST &&
2115                  event.id <= WindowEvent.WINDOW_LAST))
2116              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2117                  event.id >= ActionEvent.ACTION_FIRST &&
2118                  event.id <= ActionEvent.ACTION_LAST)
2119              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2120                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2121                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2122              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2123                  event.id >= ItemEvent.ITEM_FIRST &&
2124                  event.id <= ItemEvent.ITEM_LAST)
2125              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2126                  event.id >= TextEvent.TEXT_FIRST &&
2127                  event.id <= TextEvent.TEXT_LAST)
2128              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2129                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2130                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2131              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2132                  event.id >= PaintEvent.PAINT_FIRST &&
2133                  event.id <= PaintEvent.PAINT_LAST)
2134              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2135                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2136                  event.id <= InvocationEvent.INVOCATION_LAST)
2137              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2138                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2139              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2140                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2141                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2142              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2143                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2144              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2145                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2146                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2147                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2148                     (event instanceof sun.awt.UngrabEvent))) {
2149                 // Get the index of the call count for this event type.
2150                 // Instead of using Math.log(...) we will calculate it with
2151                 // bit shifts. That's what previous implementation looked like:
2152                 //
2153                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2154                 int ci = 0;
2155                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2156                 }
2157                 ci--;
2158                 // Call the listener as many times as it was added for this
2159                 // event type.
2160                 for (int i=0; i<calls[ci]; i++) {
2161                     listener.eventDispatched(event);
2162                 }
2163             }
2164         }
2165     }
2166 
2167     /**
2168      * Returns a map of visual attributes for the abstract level description
2169      * of the given input method highlight, or null if no mapping is found.
2170      * The style field of the input method highlight is ignored. The map
2171      * returned is unmodifiable.
2172      * @param highlight input method highlight
2173      * @return style attribute map, or {@code null}
2174      * @exception HeadlessException if
2175      *     {@code GraphicsEnvironment.isHeadless} returns true
2176      * @see       java.awt.GraphicsEnvironment#isHeadless
2177      * @since 1.3
2178      */
2179     public abstract Map<java.awt.font.TextAttribute,?>
2180         mapInputMethodHighlight(InputMethodHighlight highlight)
2181         throws HeadlessException;
2182 
2183     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2184         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2185             return new DesktopPropertyChangeSupport(toolkit);
2186         } else {
2187             return new PropertyChangeSupport(toolkit);
2188         }
2189     }
2190 
2191     @SuppressWarnings("serial")
2192     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2193 
2194         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2195                 new StringBuilder("desktop property change support key");
2196         private final Object source;
2197 
2198         public DesktopPropertyChangeSupport(Object sourceBean) {
2199             super(sourceBean);
2200             source = sourceBean;
2201         }
2202 
2203         @Override
2204         public synchronized void addPropertyChangeListener(
2205                 String propertyName,
2206                 PropertyChangeListener listener)
2207         {
2208             PropertyChangeSupport pcs = (PropertyChangeSupport)
2209                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2210             if (null == pcs) {
2211                 pcs = new PropertyChangeSupport(source);
2212                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2213             }
2214             pcs.addPropertyChangeListener(propertyName, listener);
2215         }
2216 
2217         @Override
2218         public synchronized void removePropertyChangeListener(
2219                 String propertyName,
2220                 PropertyChangeListener listener)
2221         {
2222             PropertyChangeSupport pcs = (PropertyChangeSupport)
2223                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2224             if (null != pcs) {
2225                 pcs.removePropertyChangeListener(propertyName, listener);
2226             }
2227         }
2228 
2229         @Override
2230         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2231         {
2232             PropertyChangeSupport pcs = (PropertyChangeSupport)
2233                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2234             if (null != pcs) {
2235                 return pcs.getPropertyChangeListeners();
2236             } else {
2237                 return new PropertyChangeListener[0];
2238             }
2239         }
2240 
2241         @Override
2242         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2243         {
2244             PropertyChangeSupport pcs = (PropertyChangeSupport)
2245                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2246             if (null != pcs) {
2247                 return pcs.getPropertyChangeListeners(propertyName);
2248             } else {
2249                 return new PropertyChangeListener[0];
2250             }
2251         }
2252 
2253         @Override
2254         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2255             PropertyChangeSupport pcs = (PropertyChangeSupport)
2256                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2257             if (null == pcs) {
2258                 pcs = new PropertyChangeSupport(source);
2259                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2260             }
2261             pcs.addPropertyChangeListener(listener);
2262         }
2263 
2264         @Override
2265         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2266             PropertyChangeSupport pcs = (PropertyChangeSupport)
2267                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2268             if (null != pcs) {
2269                 pcs.removePropertyChangeListener(listener);
2270             }
2271         }
2272 
2273         /*
2274          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2275          * use this method.  If this will be changed we will need to change this class.
2276          */
2277         @Override
2278         public void firePropertyChange(final PropertyChangeEvent evt) {
2279             Object oldValue = evt.getOldValue();
2280             Object newValue = evt.getNewValue();
2281             String propertyName = evt.getPropertyName();
2282             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2283                 return;
2284             }
2285             Runnable updater = new Runnable() {
2286                 public void run() {
2287                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2288                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2289                     if (null != pcs) {
2290                         pcs.firePropertyChange(evt);
2291                     }
2292                 }
2293             };
2294             final AppContext currentAppContext = AppContext.getAppContext();
2295             for (AppContext appContext : AppContext.getAppContexts()) {
2296                 if (null == appContext || appContext.isDisposed()) {
2297                     continue;
2298                 }
2299                 if (currentAppContext == appContext) {
2300                     updater.run();
2301                 } else {
2302                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2303                     SunToolkit.postEvent(appContext, e);
2304                 }
2305             }
2306         }
2307     }
2308 
2309     /**
2310     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2311     * {@code EventQueue}.
2312     * <br>
2313     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2314     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2315     * startup by the following command:
2316     * <pre>
2317     * java -Dsun.awt.enableExtraMouseButtons=false Application
2318     * </pre>
2319     * Alternatively, the property could be set in the application by using the following code:
2320     * <pre>
2321     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2322     * </pre>
2323     * before the {@code Toolkit} class initialization.
2324     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2325     * initialized with {@code true}.
2326     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2327     *
2328     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2329     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2330     *         {@code false} otherwise
2331     * @see System#getProperty(String propertyName)
2332     * @see System#setProperty(String propertyName, String value)
2333     * @see java.awt.EventQueue
2334     * @since 1.7
2335      */
2336     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2337         GraphicsEnvironment.checkHeadless();
2338 
2339         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2340     }
2341 }