Java tutorial
/* * Copyright (c) 1995, 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt; import java.awt.datatransfer.Clipboard; import java.awt.dnd.DragGestureListener; import java.awt.dnd.DragGestureRecognizer; import java.awt.dnd.DragSource; import java.awt.event.AWTEventListener; import java.awt.event.AWTEventListenerProxy; import java.awt.event.ActionEvent; import java.awt.event.AdjustmentEvent; import java.awt.event.ComponentEvent; import java.awt.event.ContainerEvent; import java.awt.event.FocusEvent; import java.awt.event.HierarchyEvent; import java.awt.event.InputEvent; import java.awt.event.InputMethodEvent; import java.awt.event.InvocationEvent; import java.awt.event.ItemEvent; import java.awt.event.KeyEvent; import java.awt.event.MouseEvent; import java.awt.event.PaintEvent; import java.awt.event.TextEvent; import java.awt.event.WindowEvent; import java.awt.im.InputMethodHighlight; import java.awt.image.ColorModel; import java.awt.image.ImageObserver; import java.awt.image.ImageProducer; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import java.io.File; import java.io.FileInputStream; import java.net.URL; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.ArrayList; import java.util.Arrays; import java.util.EventListener; import java.util.HashMap; import java.util.Map; import java.util.MissingResourceException; import java.util.Properties; import java.util.ResourceBundle; import java.util.ServiceLoader; import java.util.Set; import java.util.WeakHashMap; import java.util.stream.Collectors; import javax.accessibility.AccessibilityProvider; import sun.awt.AWTAccessor; import sun.awt.AWTPermissions; import sun.awt.AppContext; import sun.awt.HeadlessToolkit; import sun.awt.PeerEvent; import sun.awt.PlatformGraphicsInfo; import sun.awt.SunToolkit; /** * This class is the abstract superclass of all actual * implementations of the Abstract Window Toolkit. Subclasses of * the {@code Toolkit} class are used to bind the various components * to particular native toolkit implementations. * <p> * Many GUI events may be delivered to user * asynchronously, if the opposite is not specified explicitly. * As well as * many GUI operations may be performed asynchronously. * This fact means that if the state of a component is set, and then * the state immediately queried, the returned value may not yet * reflect the requested change. This behavior includes, but is not * limited to: * <ul> * <li>Scrolling to a specified position. * <br>For example, calling {@code ScrollPane.setScrollPosition} * and then {@code getScrollPosition} may return an incorrect * value if the original request has not yet been processed. * * <li>Moving the focus from one component to another. * <br>For more information, see * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#transferTiming">Timing * Focus Transfers</a>, a section in * <a href="https://docs.oracle.com/javase/tutorial/uiswing/">The Swing * Tutorial</a>. * * <li>Making a top-level container visible. * <br>Calling {@code setVisible(true)} on a {@code Window}, * {@code Frame} or {@code Dialog} may occur * asynchronously. * * <li>Setting the size or location of a top-level container. * <br>Calls to {@code setSize}, {@code setBounds} or * {@code setLocation} on a {@code Window}, * {@code Frame} or {@code Dialog} are forwarded * to the underlying window management system and may be * ignored or modified. See {@link java.awt.Window} for * more information. * </ul> * <p> * Most applications should not call any of the methods in this * class directly. The methods defined by {@code Toolkit} are * the "glue" that joins the platform-independent classes in the * {@code java.awt} package with their counterparts in * {@code java.awt.peer}. Some methods defined by * {@code Toolkit} query the native operating system directly. * * @author Sami Shaio * @author Arthur van Hoff * @author Fred Ecks * @since 1.0 */ public abstract class Toolkit { // The following method is called by the private method // <code>updateSystemColors</code> in <code>SystemColor</code>. /** * Fills in the integer array that is supplied as an argument * with the current system color values. * * @param systemColors an integer array. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.1 */ protected void loadSystemColors(int[] systemColors) throws HeadlessException { GraphicsEnvironment.checkHeadless(); } /** * Controls whether the layout of Containers is validated dynamically * during resizing, or statically, after resizing is complete. * Use {@code isDynamicLayoutActive()} to detect if this feature enabled * in this program and is supported by this operating system * and/or window manager. * Note that this feature is supported not on all platforms, and * conversely, that this feature cannot be turned off on some platforms. * On these platforms where dynamic layout during resizing is not supported * (or is always supported), setting this property has no effect. * Note that this feature can be set or unset as a property of the * operating system or window manager on some platforms. On such * platforms, the dynamic resize property must be set at the operating * system or window manager level before this method can take effect. * This method does not change support or settings of the underlying * operating system or * window manager. The OS/WM support can be * queried using getDesktopProperty("awt.dynamicLayoutSupported") method. * * @param dynamic If true, Containers should re-layout their * components as the Container is being resized. If false, * the layout will be validated after resizing is completed. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see #isDynamicLayoutSet() * @see #isDynamicLayoutActive() * @see #getDesktopProperty(String propertyName) * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.4 */ public void setDynamicLayout(final boolean dynamic) throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != getDefaultToolkit()) { getDefaultToolkit().setDynamicLayout(dynamic); } } /** * Returns whether the layout of Containers is validated dynamically * during resizing, or statically, after resizing is complete. * Note: this method returns the value that was set programmatically; * it does not reflect support at the level of the operating system * or window manager for dynamic layout on resizing, or the current * operating system or window manager settings. The OS/WM support can * be queried using getDesktopProperty("awt.dynamicLayoutSupported"). * * @return true if validation of Containers is done dynamically, * false if validation is done after resizing is finished. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see #setDynamicLayout(boolean dynamic) * @see #isDynamicLayoutActive() * @see #getDesktopProperty(String propertyName) * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.4 */ protected boolean isDynamicLayoutSet() throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().isDynamicLayoutSet(); } else { return false; } } /** * Returns whether dynamic layout of Containers on resize is currently * enabled on the underlying operating system and/or window manager. If the * platform supports it, {@code setDynamicLayout(boolean)} may be used to * programmatically enable or disable platform dynamic layout. Regardless of * whether that toggling is supported, or whether {@code true} or {@code * false} is specified as an argument, or has never been called at all, this * method will return the active current platform behavior and which will be * followed by the JDK in determining layout policy during resizing. * <p> * If dynamic layout is currently inactive then Containers re-layout their * components when resizing is completed. As a result the * {@code Component.validate()} method will be invoked only once per resize. * If dynamic layout is currently active then Containers re-layout their * components on every native resize event and the {@code validate()} method * will be invoked each time. The OS/WM support can be queried using the * getDesktopProperty("awt.dynamicLayoutSupported") method. This property * will reflect the platform capability but is not sufficient to tell if it * is presently enabled. * * @return true if dynamic layout of Containers on resize is currently * active, false otherwise. * @throws HeadlessException if the GraphicsEnvironment.isHeadless() method * returns true * @see #setDynamicLayout(boolean dynamic) * @see #isDynamicLayoutSet() * @see #getDesktopProperty(String propertyName) * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.4 */ public boolean isDynamicLayoutActive() throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().isDynamicLayoutActive(); } else { return false; } } /** * Gets the size of the screen. On systems with multiple displays, the * primary display is used. Multi-screen aware display dimensions are * available from {@code GraphicsConfiguration} and * {@code GraphicsDevice}. * @return the size of this toolkit's screen, in pixels. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsConfiguration#getBounds * @see java.awt.GraphicsDevice#getDisplayMode * @see java.awt.GraphicsEnvironment#isHeadless */ public abstract Dimension getScreenSize() throws HeadlessException; /** * Returns the screen resolution in dots-per-inch. * @return this toolkit's screen resolution, in dots-per-inch. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless */ public abstract int getScreenResolution() throws HeadlessException; /** * Gets the insets of the screen. * @param gc a {@code GraphicsConfiguration} * @return the insets of this toolkit's screen, in pixels. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.4 */ public Insets getScreenInsets(GraphicsConfiguration gc) throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().getScreenInsets(gc); } else { return new Insets(0, 0, 0, 0); } } /** * Determines the color model of this toolkit's screen. * <p> * {@code ColorModel} is an abstract class that * encapsulates the ability to translate between the * pixel values of an image and its red, green, blue, * and alpha components. * <p> * This toolkit method is called by the * {@code getColorModel} method * of the {@code Component} class. * @return the color model of this toolkit's screen. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @see java.awt.image.ColorModel * @see java.awt.Component#getColorModel */ public abstract ColorModel getColorModel() throws HeadlessException; /** * Returns the names of the available fonts in this toolkit.<p> * For 1.1, the following font names are deprecated (the replacement * name follows): * <ul> * <li>TimesRoman (use Serif) * <li>Helvetica (use SansSerif) * <li>Courier (use Monospaced) * </ul><p> * The ZapfDingbats fontname is also deprecated in 1.1 but the characters * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports * those characters. * @return the names of the available fonts in this toolkit. * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()} * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames() */ @Deprecated public abstract String[] getFontList(); /** * Gets the screen device metrics for rendering of the font. * @param font a font * @return the screen metrics of the specified font in this toolkit * @deprecated As of JDK version 1.2, replaced by the {@code Font} * method {@code getLineMetrics}. * @see java.awt.font.LineMetrics * @see java.awt.Font#getLineMetrics * @see java.awt.GraphicsEnvironment#getScreenDevices */ @Deprecated public abstract FontMetrics getFontMetrics(Font font); /** * Synchronizes this toolkit's graphics state. Some window systems * may do buffering of graphics events. * <p> * This method ensures that the display is up-to-date. It is useful * for animation. */ public abstract void sync(); /** * The default toolkit. */ private static Toolkit toolkit; /** * Used internally by the assistive technologies functions; set at * init time and used at load time */ private static String atNames; /** * Initializes properties related to assistive technologies. * These properties are used both in the loadAssistiveProperties() * function below, as well as other classes in the jdk that depend * on the properties (such as the use of the screen_magnifier_present * property in Java2D hardware acceleration initialization). The * initialization of the properties must be done before the platform- * specific Toolkit class is instantiated so that all necessary * properties are set up properly before any classes dependent upon them * are initialized. */ private static void initAssistiveTechnologies() { // Get accessibility properties final String sep = File.separator; final Properties properties = new Properties(); atNames = java.security.AccessController.doPrivileged(new java.security.PrivilegedAction<String>() { public String run() { // Try loading the per-user accessibility properties file. try { File propsFile = new File(System.getProperty("user.home") + sep + ".accessibility.properties"); FileInputStream in = new FileInputStream(propsFile); // Inputstream has been buffered in Properties class properties.load(in); in.close(); } catch (Exception e) { // Per-user accessibility properties file does not exist } // Try loading the system-wide accessibility properties // file only if a per-user accessibility properties // file does not exist or is empty. if (properties.size() == 0) { try { File propsFile = new File( System.getProperty("java.home") + sep + "conf" + sep + "accessibility.properties"); FileInputStream in = new FileInputStream(propsFile); // Inputstream has been buffered in Properties class properties.load(in); in.close(); } catch (Exception e) { // System-wide accessibility properties file does // not exist; } } // Get whether a screen magnifier is present. First check // the system property and then check the properties file. String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present"); if (magPresent == null) { magPresent = properties.getProperty("screen_magnifier_present", null); if (magPresent != null) { System.setProperty("javax.accessibility.screen_magnifier_present", magPresent); } } // Get the names of any assistive technologies to load. First // check the system property and then check the properties // file. String classNames = System.getProperty("javax.accessibility.assistive_technologies"); if (classNames == null) { classNames = properties.getProperty("assistive_technologies", null); if (classNames != null) { System.setProperty("javax.accessibility.assistive_technologies", classNames); } } return classNames; } }); } /** * Rethrow the AWTError but include the cause. * * @param s the error message * @param e the original exception * @throws AWTError the new AWTError including the cause (the original exception) */ private static void newAWTError(Throwable e, String s) { AWTError newAWTError = new AWTError(s); newAWTError.initCause(e); throw newAWTError; } /** * When a service provider for Assistive Technology is not found look for a * supporting class on the class path and instantiate it. * * @param atName the name of the class to be loaded */ private static void fallbackToLoadClassForAT(String atName) { try { Class<?> c = Class.forName(atName, false, ClassLoader.getSystemClassLoader()); c.getConstructor().newInstance(); } catch (ClassNotFoundException e) { newAWTError(e, "Assistive Technology not found: " + atName); } catch (InstantiationException e) { newAWTError(e, "Could not instantiate Assistive Technology: " + atName); } catch (IllegalAccessException e) { newAWTError(e, "Could not access Assistive Technology: " + atName); } catch (Exception e) { newAWTError(e, "Error trying to install Assistive Technology: " + atName); } } /** * Loads accessibility support using the property assistive_technologies. * The form is assistive_technologies= followed by a comma-separated list of * assistive technology providers to load. The order in which providers are * loaded is determined by the order in which the ServiceLoader discovers * implementations of the AccessibilityProvider interface, not by the order * of provider names in the property list. When a provider is found its * accessibility implementation will be started by calling the provider's * activate method. If the list of assistive technology providers is the * empty string or contains only * {@linkplain Character#isWhitespace(int) white space} characters or * {@code null} it is ignored. All other errors are handled via an AWTError * exception. */ private static void loadAssistiveTechnologies() { // Load any assistive technologies if (atNames != null && !atNames.isBlank()) { ClassLoader cl = ClassLoader.getSystemClassLoader(); Set<String> names = Arrays.stream(atNames.split(",")).map(String::trim).collect(Collectors.toSet()); final Map<String, AccessibilityProvider> providers = new HashMap<>(); AccessController.doPrivileged((PrivilegedAction<Void>) () -> { try { for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) { String name = p.getName(); if (names.contains(name) && !providers.containsKey(name)) { p.activate(); providers.put(name, p); } } } catch (java.util.ServiceConfigurationError | Exception e) { newAWTError(e, "Could not load or activate service provider"); } return null; }); names.stream().filter(n -> !providers.containsKey(n)).forEach(Toolkit::fallbackToLoadClassForAT); } } /** * Gets the default toolkit. * <p> * If a system property named {@code "java.awt.headless"} is set * to {@code true} then the headless implementation * of {@code Toolkit} is used, * otherwise the default platform-specific implementation of * {@code Toolkit} is used. * <p> * If this Toolkit is not a headless implementation and if they exist, service * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded * if specified by the system property * {@code javax.accessibility.assistive_technologies}. * <p> * An example of setting this property is to invoke Java with * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}. * In addition to MyServiceProvider other service providers can be specified * using a comma separated list. Service providers are loaded after the AWT * toolkit is created. * <p> * If the list of assistive technology providers as provided through system * property "{@systemProperty javax.accessibility.assistive_technologies}" * is the empty string or contains only * {@linkplain Character#isWhitespace(int) white space} characters it is * ignored. All other errors are handled via an AWTError exception. * <p> * The names specified in the assistive_technologies property are used to query * each service provider implementation. If the requested name matches the * {@linkplain AccessibilityProvider#getName name} of the service provider, the * {@link AccessibilityProvider#activate} method will be invoked to activate the * matching service provider. * * @implSpec * If assistive technology service providers are not specified with a system * property this implementation will look in a properties file located as follows: * <ul> * <li> {@code ${user.home}/.accessibility.properties} * <li> {@code ${java.home}/conf/accessibility.properties} * </ul> * Only the first of these files to be located will be consulted. The requested * service providers are specified by setting the {@code assistive_technologies=} * property. A single provider or a comma separated list of providers can be * specified. * * @return the default toolkit. * @throws AWTError in case of an error loading assistive technologies. * @see java.util.ServiceLoader * @see javax.accessibility.AccessibilityProvider */ public static synchronized Toolkit getDefaultToolkit() { if (toolkit == null) { toolkit = PlatformGraphicsInfo.createToolkit(); if (GraphicsEnvironment.isHeadless() && !(toolkit instanceof HeadlessToolkit)) { toolkit = new HeadlessToolkit(toolkit); } if (!GraphicsEnvironment.isHeadless()) { loadAssistiveTechnologies(); } } return toolkit; } /** * Returns an image which gets pixel data from the specified file, * whose format can be either GIF, JPEG or PNG. * The underlying toolkit attempts to resolve multiple requests * with the same filename to the same returned Image. * <p> * Since the mechanism required to facilitate this sharing of * {@code Image} objects may continue to hold onto images * that are no longer in use for an indefinite period of time, * developers are encouraged to implement their own caching of * images by using the {@link #createImage(java.lang.String) createImage} * variant wherever available. * If the image data contained in the specified file changes, * the {@code Image} object returned from this method may * still contain stale information which was loaded from the * file after a prior call. * Previously loaded image data can be manually discarded by * calling the {@link Image#flush flush} method on the * returned {@code Image}. * <p> * This method first checks if there is a security manager installed. * If so, the method calls the security manager's * {@code checkRead} method with the file specified to ensure * that the access to the image is allowed. * @param filename the name of a file containing pixel data * in a recognized file format. * @return an image which gets its pixel data from * the specified file. * @throws SecurityException if a security manager exists and its * checkRead method doesn't allow the operation. * @see #createImage(java.lang.String) */ public abstract Image getImage(String filename); /** * Returns an image which gets pixel data from the specified URL. * The pixel data referenced by the specified URL must be in one * of the following formats: GIF, JPEG or PNG. * The underlying toolkit attempts to resolve multiple requests * with the same URL to the same returned Image. * <p> * Since the mechanism required to facilitate this sharing of * {@code Image} objects may continue to hold onto images * that are no longer in use for an indefinite period of time, * developers are encouraged to implement their own caching of * images by using the {@link #createImage(java.net.URL) createImage} * variant wherever available. * If the image data stored at the specified URL changes, * the {@code Image} object returned from this method may * still contain stale information which was fetched from the * URL after a prior call. * Previously loaded image data can be manually discarded by * calling the {@link Image#flush flush} method on the * returned {@code Image}. * <p> * This method first checks if there is a security manager installed. * If so, the method calls the security manager's * {@code checkPermission} method with the corresponding * permission to ensure that the access to the image is allowed. * If the connection to the specified URL requires * either {@code URLPermission} or {@code SocketPermission}, * then {@code URLPermission} is used for security checks. * @param url the URL to use in fetching the pixel data. * @return an image which gets its pixel data from * the specified URL. * @throws SecurityException if a security manager exists and its * checkPermission method doesn't allow * the operation. * @see #createImage(java.net.URL) */ public abstract Image getImage(URL url); /** * Returns an image which gets pixel data from the specified file. * The returned Image is a new object which will not be shared * with any other caller of this method or its getImage variant. * <p> * This method first checks if there is a security manager installed. * If so, the method calls the security manager's * {@code checkRead} method with the specified file to ensure * that the image creation is allowed. * @param filename the name of a file containing pixel data * in a recognized file format. * @return an image which gets its pixel data from * the specified file. * @throws SecurityException if a security manager exists and its * checkRead method doesn't allow the operation. * @see #getImage(java.lang.String) */ public abstract Image createImage(String filename); /** * Returns an image which gets pixel data from the specified URL. * The returned Image is a new object which will not be shared * with any other caller of this method or its getImage variant. * <p> * This method first checks if there is a security manager installed. * If so, the method calls the security manager's * {@code checkPermission} method with the corresponding * permission to ensure that the image creation is allowed. * If the connection to the specified URL requires * either {@code URLPermission} or {@code SocketPermission}, * then {@code URLPermission} is used for security checks. * @param url the URL to use in fetching the pixel data. * @return an image which gets its pixel data from * the specified URL. * @throws SecurityException if a security manager exists and its * checkPermission method doesn't allow * the operation. * @see #getImage(java.net.URL) */ public abstract Image createImage(URL url); /** * Prepares an image for rendering. * <p> * If the values of the width and height arguments are both * {@code -1}, this method prepares the image for rendering * on the default screen; otherwise, this method prepares an image * for rendering on the default screen at the specified width and height. * <p> * The image data is downloaded asynchronously in another thread, * and an appropriately scaled screen representation of the image is * generated. * <p> * This method is called by components {@code prepareImage} * methods. * <p> * Information on the flags returned by this method can be found * with the definition of the {@code ImageObserver} interface. * @param image the image for which to prepare a * screen representation. * @param width the width of the desired screen * representation, or {@code -1}. * @param height the height of the desired screen * representation, or {@code -1}. * @param observer the {@code ImageObserver} * object to be notified as the * image is being prepared. * @return {@code true} if the image has already been * fully prepared; {@code false} otherwise. * @see java.awt.Component#prepareImage(java.awt.Image, * java.awt.image.ImageObserver) * @see java.awt.Component#prepareImage(java.awt.Image, * int, int, java.awt.image.ImageObserver) * @see java.awt.image.ImageObserver */ public abstract boolean prepareImage(Image image, int width, int height, ImageObserver observer); /** * Indicates the construction status of a specified image that is * being prepared for display. * <p> * If the values of the width and height arguments are both * {@code -1}, this method returns the construction status of * a screen representation of the specified image in this toolkit. * Otherwise, this method returns the construction status of a * scaled representation of the image at the specified width * and height. * <p> * This method does not cause the image to begin loading. * An application must call {@code prepareImage} to force * the loading of an image. * <p> * This method is called by the component's {@code checkImage} * methods. * <p> * Information on the flags returned by this method can be found * with the definition of the {@code ImageObserver} interface. * @param image the image whose status is being checked. * @param width the width of the scaled version whose status is * being checked, or {@code -1}. * @param height the height of the scaled version whose status * is being checked, or {@code -1}. * @param observer the {@code ImageObserver} object to be * notified as the image is being prepared. * @return the bitwise inclusive <strong>OR</strong> of the * {@code ImageObserver} flags for the * image data that is currently available. * @see java.awt.Toolkit#prepareImage(java.awt.Image, * int, int, java.awt.image.ImageObserver) * @see java.awt.Component#checkImage(java.awt.Image, * java.awt.image.ImageObserver) * @see java.awt.Component#checkImage(java.awt.Image, * int, int, java.awt.image.ImageObserver) * @see java.awt.image.ImageObserver */ public abstract int checkImage(Image image, int width, int height, ImageObserver observer); /** * Creates an image with the specified image producer. * @param producer the image producer to be used. * @return an image with the specified image producer. * @see java.awt.Image * @see java.awt.image.ImageProducer * @see java.awt.Component#createImage(java.awt.image.ImageProducer) */ public abstract Image createImage(ImageProducer producer); /** * Creates an image which decodes the image stored in the specified * byte array. * <p> * The data must be in some image format, such as GIF or JPEG, * that is supported by this toolkit. * @param imagedata an array of bytes, representing * image data in a supported image format. * @return an image. * @since 1.1 */ public Image createImage(byte[] imagedata) { return createImage(imagedata, 0, imagedata.length); } /** * Creates an image which decodes the image stored in the specified * byte array, and at the specified offset and length. * The data must be in some image format, such as GIF or JPEG, * that is supported by this toolkit. * @param imagedata an array of bytes, representing * image data in a supported image format. * @param imageoffset the offset of the beginning * of the data in the array. * @param imagelength the length of the data in the array. * @return an image. * @since 1.1 */ public abstract Image createImage(byte[] imagedata, int imageoffset, int imagelength); /** * Gets a {@code PrintJob} object which is the result of initiating * a print operation on the toolkit's platform. * <p> * Each actual implementation of this method should first check if there * is a security manager installed. If there is, the method should call * the security manager's {@code checkPrintJobAccess} method to * ensure initiation of a print operation is allowed. If the default * implementation of {@code checkPrintJobAccess} is used (that is, * that method is not overriden), then this results in a call to the * security manager's {@code checkPermission} method with a * {@code RuntimePermission("queuePrintJob")} permission. * * @param frame the parent of the print dialog. May not be null. * @param jobtitle the title of the PrintJob. A null title is equivalent * to "". * @param props a Properties object containing zero or more properties. * Properties are not standardized and are not consistent across * implementations. Because of this, PrintJobs which require job * and page control should use the version of this function which * takes JobAttributes and PageAttributes objects. This object * may be updated to reflect the user's job choices on exit. May * be null. * @return a {@code PrintJob} object, or {@code null} if the * user cancelled the print job. * @throws NullPointerException if frame is null * @throws SecurityException if this thread is not allowed to initiate a * print job request * @see java.awt.GraphicsEnvironment#isHeadless * @see java.awt.PrintJob * @see java.lang.RuntimePermission * @since 1.1 */ public abstract PrintJob getPrintJob(Frame frame, String jobtitle, Properties props); /** * Gets a {@code PrintJob} object which is the result of initiating * a print operation on the toolkit's platform. * <p> * Each actual implementation of this method should first check if there * is a security manager installed. If there is, the method should call * the security manager's {@code checkPrintJobAccess} method to * ensure initiation of a print operation is allowed. If the default * implementation of {@code checkPrintJobAccess} is used (that is, * that method is not overriden), then this results in a call to the * security manager's {@code checkPermission} method with a * {@code RuntimePermission("queuePrintJob")} permission. * * @param frame the parent of the print dialog. May not be null. * @param jobtitle the title of the PrintJob. A null title is equivalent * to "". * @param jobAttributes a set of job attributes which will control the * PrintJob. The attributes will be updated to reflect the user's * choices as outlined in the JobAttributes documentation. May be * null. * @param pageAttributes a set of page attributes which will control the * PrintJob. The attributes will be applied to every page in the * job. The attributes will be updated to reflect the user's * choices as outlined in the PageAttributes documentation. May be * null. * @return a {@code PrintJob} object, or {@code null} if the * user cancelled the print job. * @throws NullPointerException if frame is null * @throws IllegalArgumentException if pageAttributes specifies differing * cross feed and feed resolutions. Also if this thread has * access to the file system and jobAttributes specifies * print to file, and the specified destination file exists but * is a directory rather than a regular file, does not exist but * cannot be created, or cannot be opened for any other reason. * However in the case of print to file, if a dialog is also * requested to be displayed then the user will be given an * opportunity to select a file and proceed with printing. * The dialog will ensure that the selected output file * is valid before returning from this method. * @throws SecurityException if this thread is not allowed to initiate a * print job request, or if jobAttributes specifies print to file, * and this thread is not allowed to access the file system * @see java.awt.PrintJob * @see java.awt.GraphicsEnvironment#isHeadless * @see java.lang.RuntimePermission * @see java.awt.JobAttributes * @see java.awt.PageAttributes * @since 1.3 */ public PrintJob getPrintJob(Frame frame, String jobtitle, JobAttributes jobAttributes, PageAttributes pageAttributes) { // Override to add printing support with new job/page control classes if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle, jobAttributes, pageAttributes); } else { return getPrintJob(frame, jobtitle, null); } } /** * Emits an audio beep depending on native system settings and hardware * capabilities. * @since 1.1 */ public abstract void beep(); /** * Gets the singleton instance of the system Clipboard which interfaces * with clipboard facilities provided by the native platform. This * clipboard enables data transfer between Java programs and native * applications which use native clipboard facilities. * <p> * In addition to any and all default formats text returned by the system * Clipboard's {@code getTransferData()} method is available in the * following flavors: * <ul> * <li>DataFlavor.stringFlavor</li> * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li> * </ul> * As with {@code java.awt.datatransfer.StringSelection}, if the * requested flavor is {@code DataFlavor.plainTextFlavor}, or an * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of * the system Clipboard's {@code getTransferData()} method for * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}. * Because of this, support for * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is * <b>deprecated</b>. * <p> * Each actual implementation of this method should first check if there * is a security manager installed. If there is, the method should call * the security manager's {@link SecurityManager#checkPermission * checkPermission} method to check {@code AWTPermission("accessClipboard")}. * * @return the system Clipboard * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @see java.awt.datatransfer.Clipboard * @see java.awt.datatransfer.StringSelection * @see java.awt.datatransfer.DataFlavor#stringFlavor * @see java.awt.datatransfer.DataFlavor#plainTextFlavor * @see java.io.Reader * @see java.awt.AWTPermission * @since 1.1 */ public abstract Clipboard getSystemClipboard() throws HeadlessException; /** * Gets the singleton instance of the system selection as a * {@code Clipboard} object. This allows an application to read and * modify the current, system-wide selection. * <p> * An application is responsible for updating the system selection whenever * the user selects text, using either the mouse or the keyboard. * Typically, this is implemented by installing a * {@code FocusListener} on all {@code Component}s which support * text selection, and, between {@code FOCUS_GAINED} and * {@code FOCUS_LOST} events delivered to that {@code Component}, * updating the system selection {@code Clipboard} when the selection * changes inside the {@code Component}. Properly updating the system * selection ensures that a Java application will interact correctly with * native applications and other Java applications running simultaneously * on the system. Note that {@code java.awt.TextComponent} and * {@code javax.swing.text.JTextComponent} already adhere to this * policy. When using these classes, and their subclasses, developers need * not write any additional code. * <p> * Some platforms do not support a system selection {@code Clipboard}. * On those platforms, this method will return {@code null}. In such a * case, an application is absolved from its responsibility to update the * system selection {@code Clipboard} as described above. * <p> * Each actual implementation of this method should first check if there * is a security manager installed. If there is, the method should call * the security manager's {@link SecurityManager#checkPermission * checkPermission} method to check {@code AWTPermission("accessClipboard")}. * * @return the system selection as a {@code Clipboard}, or * {@code null} if the native platform does not support a * system selection {@code Clipboard} * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * * @see java.awt.datatransfer.Clipboard * @see java.awt.event.FocusListener * @see java.awt.event.FocusEvent#FOCUS_GAINED * @see java.awt.event.FocusEvent#FOCUS_LOST * @see TextComponent * @see javax.swing.text.JTextComponent * @see AWTPermission * @see GraphicsEnvironment#isHeadless * @since 1.4 */ public Clipboard getSystemSelection() throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().getSystemSelection(); } else { GraphicsEnvironment.checkHeadless(); return null; } } /** * Determines which modifier key is the appropriate accelerator * key for menu shortcuts. * <p> * Menu shortcuts, which are embodied in the * {@code MenuShortcut} class, are handled by the * {@code MenuBar} class. * <p> * By default, this method returns {@code Event.CTRL_MASK}. * Toolkit implementations should override this method if the * <b>Control</b> key isn't the correct key for accelerators. * @return the modifier mask on the {@code Event} class * that is used for menu shortcuts on this toolkit. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @see java.awt.MenuBar * @see java.awt.MenuShortcut * @deprecated It is recommended that extended modifier keys and * {@link #getMenuShortcutKeyMaskEx()} be used instead * @since 1.1 */ @Deprecated(since = "10") public int getMenuShortcutKeyMask() throws HeadlessException { GraphicsEnvironment.checkHeadless(); return Event.CTRL_MASK; } /** * Determines which extended modifier key is the appropriate accelerator * key for menu shortcuts. * <p> * Menu shortcuts, which are embodied in the {@code MenuShortcut} class, are * handled by the {@code MenuBar} class. * <p> * By default, this method returns {@code InputEvent.CTRL_DOWN_MASK}. * Toolkit implementations should override this method if the * <b>Control</b> key isn't the correct key for accelerators. * * @return the modifier mask on the {@code InputEvent} class that is used * for menu shortcuts on this toolkit * @throws HeadlessException if GraphicsEnvironment.isHeadless() returns * true * @see java.awt.GraphicsEnvironment#isHeadless * @see java.awt.MenuBar * @see java.awt.MenuShortcut * @since 10 */ public int getMenuShortcutKeyMaskEx() throws HeadlessException { GraphicsEnvironment.checkHeadless(); return InputEvent.CTRL_DOWN_MASK; } /** * Returns whether the given locking key on the keyboard is currently in * its "on" state. * Valid key codes are * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK}, * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK}, * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}. * * @param keyCode the key code * @return {@code true} if the given key is currently in its "on" state; * otherwise {@code false} * @exception java.lang.IllegalArgumentException if {@code keyCode} * is not one of the valid key codes * @exception java.lang.UnsupportedOperationException if the host system doesn't * allow getting the state of this key programmatically, or if the keyboard * doesn't have this key * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.3 */ public boolean getLockingKeyState(int keyCode) throws UnsupportedOperationException { GraphicsEnvironment.checkHeadless(); if (!(keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK || keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) { throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState"); } throw new UnsupportedOperationException("Toolkit.getLockingKeyState"); } /** * Sets the state of the given locking key on the keyboard. * Valid key codes are * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK}, * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK}, * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}. * <p> * Depending on the platform, setting the state of a locking key may * involve event processing and therefore may not be immediately * observable through getLockingKeyState. * * @param keyCode the key code * @param on the state of the key * @exception java.lang.IllegalArgumentException if {@code keyCode} * is not one of the valid key codes * @exception java.lang.UnsupportedOperationException if the host system doesn't * allow setting the state of this key programmatically, or if the keyboard * doesn't have this key * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.3 */ public void setLockingKeyState(int keyCode, boolean on) throws UnsupportedOperationException { GraphicsEnvironment.checkHeadless(); if (!(keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK || keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) { throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState"); } throw new UnsupportedOperationException("Toolkit.setLockingKeyState"); } /** * Give native peers the ability to query the native container * given a native component (eg the direct parent may be lightweight). * * @param c the component to fetch the container for * @return the native container object for the component */ protected static Container getNativeContainer(Component c) { return c.getNativeContainer(); } /** * Creates a new custom cursor object. * If the image to display is invalid, the cursor will be hidden (made * completely transparent), and the hotspot will be set to (0, 0). * * <p>Note that multi-frame images are invalid and may cause this * method to hang. * * @param cursor the image to display when the cursor is activated * @param hotSpot the X and Y of the large cursor's hot spot; the * hotSpot values must be less than the Dimension returned by * {@code getBestCursorSize} * @param name a localized description of the cursor, for Java Accessibility use * @exception IndexOutOfBoundsException if the hotSpot values are outside * the bounds of the cursor * @return the cursor created * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.2 */ public Cursor createCustomCursor(Image cursor, Point hotSpot, String name) throws IndexOutOfBoundsException, HeadlessException { // Override to implement custom cursor support. if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().createCustomCursor(cursor, hotSpot, name); } else { return new Cursor(Cursor.DEFAULT_CURSOR); } } /** * Returns the supported cursor dimension which is closest to the desired * sizes. Systems which only support a single cursor size will return that * size regardless of the desired sizes. Systems which don't support custom * cursors will return a dimension of 0, 0. <p> * Note: if an image is used whose dimensions don't match a supported size * (as returned by this method), the Toolkit implementation will attempt to * resize the image to a supported size. * Since converting low-resolution images is difficult, * no guarantees are made as to the quality of a cursor image which isn't a * supported size. It is therefore recommended that this method * be called and an appropriate image used so no image conversion is made. * * @param preferredWidth the preferred cursor width the component would like * to use. * @param preferredHeight the preferred cursor height the component would like * to use. * @return the closest matching supported cursor size, or a dimension of 0,0 if * the Toolkit implementation doesn't support custom cursors. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.2 */ public Dimension getBestCursorSize(int preferredWidth, int preferredHeight) throws HeadlessException { GraphicsEnvironment.checkHeadless(); // Override to implement custom cursor support. if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().getBestCursorSize(preferredWidth, preferredHeight); } else { return new Dimension(0, 0); } } /** * Returns the maximum number of colors the Toolkit supports in a custom cursor * palette.<p> * Note: if an image is used which has more colors in its palette than * the supported maximum, the Toolkit implementation will attempt to flatten the * palette to the maximum. Since converting low-resolution images is difficult, * no guarantees are made as to the quality of a cursor image which has more * colors than the system supports. It is therefore recommended that this method * be called and an appropriate image used so no image conversion is made. * * @return the maximum number of colors, or zero if custom cursors are not * supported by this Toolkit implementation. * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.2 */ public int getMaximumCursorColors() throws HeadlessException { GraphicsEnvironment.checkHeadless(); // Override to implement custom cursor support. if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().getMaximumCursorColors(); } else { return 0; } } /** * Returns whether Toolkit supports this state for * {@code Frame}s. This method tells whether the <em>UI * concept</em> of, say, maximization or iconification is * supported. It will always return false for "compound" states * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}. * In other words, the rule of thumb is that only queries with a * single frame state constant as an argument are meaningful. * <p>Note that supporting a given concept is a platform- * dependent feature. Due to native limitations the Toolkit * object may report a particular state as supported, however at * the same time the Toolkit object will be unable to apply the * state to a given frame. This circumstance has two following * consequences: * <ul> * <li>Only the return value of {@code false} for the present * method actually indicates that the given state is not * supported. If the method returns {@code true} the given state * may still be unsupported and/or unavailable for a particular * frame. * <li>The developer should consider examining the value of the * {@link java.awt.event.WindowEvent#getNewState} method of the * {@code WindowEvent} received through the {@link * java.awt.event.WindowStateListener}, rather than assuming * that the state given to the {@code setExtendedState()} method * will be definitely applied. For more information see the * documentation for the {@link Frame#setExtendedState} method. * </ul> * * @param state one of named frame state constants. * @return {@code true} is this frame state is supported by * this Toolkit implementation, {@code false} otherwise. * @exception HeadlessException * if {@code GraphicsEnvironment.isHeadless()} * returns {@code true}. * @see java.awt.Window#addWindowStateListener * @since 1.4 */ public boolean isFrameStateSupported(int state) throws HeadlessException { GraphicsEnvironment.checkHeadless(); if (this != Toolkit.getDefaultToolkit()) { return Toolkit.getDefaultToolkit().isFrameStateSupported(state); } else { return (state == Frame.NORMAL); // others are not guaranteed } } /** * Support for I18N: any visible strings should be stored in * sun.awt.resources.awt.properties. The ResourceBundle is stored * here, so that only one copy is maintained. */ private static ResourceBundle resources; private static ResourceBundle platformResources; // called by platform toolkit private static void setPlatformResources(ResourceBundle bundle) { platformResources = bundle; } /** * Initialize JNI field and method ids */ private static native void initIDs(); /** * WARNING: This is a temporary workaround for a problem in the * way the AWT loads native libraries. A number of classes in the * AWT package have a native method, initIDs(), which initializes * the JNI field and method ids used in the native portion of * their implementation. * * Since the use and storage of these ids is done by the * implementation libraries, the implementation of these method is * provided by the particular AWT implementations (for example, * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The * problem is that this means that the native libraries must be * loaded by the java.* classes, which do not necessarily know the * names of the libraries to load. A better way of doing this * would be to provide a separate library which defines java.awt.* * initIDs, and exports the relevant symbols out to the * implementation libraries. * * For now, we know it's done by the implementation, and we assume * that the name of the library is "awt". -br. * * If you change loadLibraries(), please add the change to * java.awt.image.ColorModel.loadLibraries(). Unfortunately, * classes can be loaded in java.awt.image that depend on * libawt and there is no way to call Toolkit.loadLibraries() * directly. -hung */ private static boolean loaded = false; static void loadLibraries() { if (!loaded) { java.security.AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() { public Void run() { System.loadLibrary("awt"); return null; } }); loaded = true; } } static { AWTAccessor.setToolkitAccessor(new AWTAccessor.ToolkitAccessor() { @Override public void setPlatformResources(ResourceBundle bundle) { Toolkit.setPlatformResources(bundle); } }); java.security.AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() { public Void run() { try { resources = ResourceBundle.getBundle("sun.awt.resources.awt"); } catch (MissingResourceException e) { // No resource file; defaults will be used. } return null; } }); // ensure that the proper libraries are loaded loadLibraries(); initAssistiveTechnologies(); initIDs(); } /** * Gets a property with the specified key and default. * This method returns defaultValue if the property is not found. * * @param key the key * @param defaultValue the default value * @return the value of the property or the default value * if the property was not found */ public static String getProperty(String key, String defaultValue) { // first try platform specific bundle if (platformResources != null) { try { return platformResources.getString(key); } catch (MissingResourceException e) { } } // then shared one if (resources != null) { try { return resources.getString(key); } catch (MissingResourceException e) { } } return defaultValue; } /** * Get the application's or applet's EventQueue instance. * Depending on the Toolkit implementation, different EventQueues * may be returned for different applets. Applets should * therefore not assume that the EventQueue instance returned * by this method will be shared by other applets or the system. * * <p> If there is a security manager then its * {@link SecurityManager#checkPermission checkPermission} method * is called to check {@code AWTPermission("accessEventQueue")}. * * @return the {@code EventQueue} object * @throws SecurityException * if a security manager is set and it denies access to * the {@code EventQueue} * @see java.awt.AWTPermission */ public final EventQueue getSystemEventQueue() { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION); } return getSystemEventQueueImpl(); } /** * Gets the application's or applet's {@code EventQueue} * instance, without checking access. For security reasons, * this can only be called from a {@code Toolkit} subclass. * @return the {@code EventQueue} object */ protected abstract EventQueue getSystemEventQueueImpl(); /* Accessor method for use by AWT package routines. */ static EventQueue getEventQueue() { return getDefaultToolkit().getSystemEventQueueImpl(); } /** * Creates a concrete, platform dependent, subclass of the abstract * DragGestureRecognizer class requested, and associates it with the * DragSource, Component and DragGestureListener specified. * * subclasses should override this to provide their own implementation * * @param <T> the type of DragGestureRecognizer to create * @param abstractRecognizerClass The abstract class of the required recognizer * @param ds The DragSource * @param c The Component target for the DragGestureRecognizer * @param srcActions The actions permitted for the gesture * @param dgl The DragGestureListener * * @return the new object or null. Always returns null if * GraphicsEnvironment.isHeadless() returns true. * @see java.awt.GraphicsEnvironment#isHeadless */ public <T extends DragGestureRecognizer> T createDragGestureRecognizer(Class<T> abstractRecognizerClass, DragSource ds, Component c, int srcActions, DragGestureListener dgl) { return null; } /** * Obtains a value for the specified desktop property. * * A desktop property is a uniquely named value for a resource that * is Toolkit global in nature. Usually it also is an abstract * representation for an underlying platform dependent desktop setting. * For more information on desktop properties supported by the AWT see * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>. * * @param propertyName the property name * @return the value for the specified desktop property */ public final synchronized Object getDesktopProperty(String propertyName) { // This is a workaround for headless toolkits. It would be // better to override this method but it is declared final. // "this instanceof" syntax defeats polymorphism. // --mm, 03/03/00 if (this instanceof HeadlessToolkit) { return ((HeadlessToolkit) this).getUnderlyingToolkit().getDesktopProperty(propertyName); } if (desktopProperties.isEmpty()) { initializeDesktopProperties(); } Object value; // This property should never be cached if (propertyName.equals("awt.dynamicLayoutSupported")) { return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName); } value = desktopProperties.get(propertyName); if (value == null) { value = lazilyLoadDesktopProperty(propertyName); if (value != null) { setDesktopProperty(propertyName, value); } } /* for property "awt.font.desktophints" */ if (value instanceof RenderingHints) { value = ((RenderingHints) value).clone(); } return value; } /** * Sets the named desktop property to the specified value and fires a * property change event to notify any listeners that the value has changed. * * @param name the property name * @param newValue the new property value */ protected final void setDesktopProperty(String name, Object newValue) { // This is a workaround for headless toolkits. It would be // better to override this method but it is declared final. // "this instanceof" syntax defeats polymorphism. // --mm, 03/03/00 if (this instanceof HeadlessToolkit) { ((HeadlessToolkit) this).getUnderlyingToolkit().setDesktopProperty(name, newValue); return; } Object oldValue; synchronized (this) { oldValue = desktopProperties.get(name); desktopProperties.put(name, newValue); } // Don't fire change event if old and new values are null. // It helps to avoid recursive resending of WM_THEMECHANGED if (oldValue != null || newValue != null) { desktopPropsSupport.firePropertyChange(name, oldValue, newValue); } } /** * An opportunity to lazily evaluate desktop property values. * @return the desktop property or null * @param name the name */ protected Object lazilyLoadDesktopProperty(String name) { return null; } /** * initializeDesktopProperties */ protected void initializeDesktopProperties() { } /** * Adds the specified property change listener for the named desktop * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added, * its property name is ignored, and the wrapped listener is added. * If {@code name} is {@code null} or {@code pcl} is {@code null}, * no exception is thrown and no action is performed. * * @param name The name of the property to listen for * @param pcl The property change listener * @see PropertyChangeSupport#addPropertyChangeListener(String, PropertyChangeListener) * @since 1.2 */ public void addPropertyChangeListener(String name, PropertyChangeListener pcl) { desktopPropsSupport.addPropertyChangeListener(name, pcl); } /** * Removes the specified property change listener for the named * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object * is removed, its property name is ignored, and * the wrapped listener is removed. * If {@code name} is {@code null} or {@code pcl} is {@code null}, * no exception is thrown and no action is performed. * * @param name The name of the property to remove * @param pcl The property change listener * @see PropertyChangeSupport#removePropertyChangeListener(String, PropertyChangeListener) * @since 1.2 */ public void removePropertyChangeListener(String name, PropertyChangeListener pcl) { desktopPropsSupport.removePropertyChangeListener(name, pcl); } /** * Returns an array of all the property change listeners * registered on this toolkit. The returned array * contains {@link java.beans.PropertyChangeListenerProxy} objects * that associate listeners with the names of desktop properties. * * @return all of this toolkit's {@link PropertyChangeListener} * objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects * or an empty array if no listeners are added * * @see PropertyChangeSupport#getPropertyChangeListeners() * @since 1.4 */ public PropertyChangeListener[] getPropertyChangeListeners() { return desktopPropsSupport.getPropertyChangeListeners(); } /** * Returns an array of all property change listeners * associated with the specified name of a desktop property. * * @param propertyName the named property * @return all of the {@code PropertyChangeListener} objects * associated with the specified name of a desktop property * or an empty array if no such listeners are added * * @see PropertyChangeSupport#getPropertyChangeListeners(String) * @since 1.4 */ public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) { return desktopPropsSupport.getPropertyChangeListeners(propertyName); } /** * The desktop properties. */ protected final Map<String, Object> desktopProperties = new HashMap<String, Object>(); /** * The desktop properties change support. */ protected final PropertyChangeSupport desktopPropsSupport = Toolkit.createPropertyChangeSupport(this); /** * Returns whether the always-on-top mode is supported by this toolkit. * To detect whether the always-on-top mode is supported for a * particular Window, use {@link Window#isAlwaysOnTopSupported}. * @return {@code true}, if current toolkit supports the always-on-top mode, * otherwise returns {@code false} * @see Window#isAlwaysOnTopSupported * @see Window#setAlwaysOnTop(boolean) * @since 1.6 */ public boolean isAlwaysOnTopSupported() { return true; } /** * Returns whether the given modality type is supported by this toolkit. If * a dialog with unsupported modality type is created, then * {@code Dialog.ModalityType.MODELESS} is used instead. * * @param modalityType modality type to be checked for support by this toolkit * * @return {@code true}, if current toolkit supports given modality * type, {@code false} otherwise * * @see java.awt.Dialog.ModalityType * @see java.awt.Dialog#getModalityType * @see java.awt.Dialog#setModalityType * * @since 1.6 */ public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType); /** * Returns whether the given modal exclusion type is supported by this * toolkit. If an unsupported modal exclusion type property is set on a window, * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead. * * @param modalExclusionType modal exclusion type to be checked for support by this toolkit * * @return {@code true}, if current toolkit supports given modal exclusion * type, {@code false} otherwise * * @see java.awt.Dialog.ModalExclusionType * @see java.awt.Window#getModalExclusionType * @see java.awt.Window#setModalExclusionType * * @since 1.6 */ public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType); // 8014718: logging has been removed from SunToolkit private static final int LONG_BITS = 64; private int[] calls = new int[LONG_BITS]; private static volatile long enabledOnToolkitMask; private AWTEventListener eventListener = null; private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>(); /* * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy, * if the listener is proxied. */ private static AWTEventListener deProxyAWTEventListener(AWTEventListener l) { AWTEventListener localL = l; if (localL == null) { return null; } // if user passed in a AWTEventListenerProxy object, extract // the listener if (l instanceof AWTEventListenerProxy) { localL = ((AWTEventListenerProxy) l).getListener(); } return localL; } /** * Adds an AWTEventListener to receive all AWTEvents dispatched * system-wide that conform to the given {@code eventMask}. * <p> * First, if there is a security manager, its {@code checkPermission} * method is called with an * {@code AWTPermission("listenToAllAWTEvents")} permission. * This may result in a SecurityException. * <p> * {@code eventMask} is a bitmask of event types to receive. * It is constructed by bitwise OR-ing together the event masks * defined in {@code AWTEvent}. * <p> * Note: event listener use is not recommended for normal * application use, but are intended solely to support special * purpose facilities including support for accessibility, * event record/playback, and diagnostic tracing. * * If listener is null, no exception is thrown and no action is performed. * * @param listener the event listener. * @param eventMask the bitmask of event types to receive * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method doesn't allow the operation. * @see #removeAWTEventListener * @see #getAWTEventListeners * @see SecurityManager#checkPermission * @see java.awt.AWTEvent * @see java.awt.AWTPermission * @see java.awt.event.AWTEventListener * @see java.awt.event.AWTEventListenerProxy * @since 1.2 */ public void addAWTEventListener(AWTEventListener listener, long eventMask) { AWTEventListener localL = deProxyAWTEventListener(listener); if (localL == null) { return; } SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION); } synchronized (this) { SelectiveAWTEventListener selectiveListener = listener2SelectiveListener.get(localL); if (selectiveListener == null) { // Create a new selectiveListener. selectiveListener = new SelectiveAWTEventListener(localL, eventMask); listener2SelectiveListener.put(localL, selectiveListener); eventListener = ToolkitEventMulticaster.add(eventListener, selectiveListener); } // OR the eventMask into the selectiveListener's event mask. selectiveListener.orEventMasks(eventMask); enabledOnToolkitMask |= eventMask; long mask = eventMask; for (int i = 0; i < LONG_BITS; i++) { // If no bits are set, break out of loop. if (mask == 0) { break; } if ((mask & 1L) != 0) { // Always test bit 0. calls[i]++; } mask >>>= 1; // Right shift, fill with zeros on left. } } } /** * Removes an AWTEventListener from receiving dispatched AWTEvents. * <p> * First, if there is a security manager, its {@code checkPermission} * method is called with an * {@code AWTPermission("listenToAllAWTEvents")} permission. * This may result in a SecurityException. * <p> * Note: event listener use is not recommended for normal * application use, but are intended solely to support special * purpose facilities including support for accessibility, * event record/playback, and diagnostic tracing. * * If listener is null, no exception is thrown and no action is performed. * * @param listener the event listener. * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method doesn't allow the operation. * @see #addAWTEventListener * @see #getAWTEventListeners * @see SecurityManager#checkPermission * @see java.awt.AWTEvent * @see java.awt.AWTPermission * @see java.awt.event.AWTEventListener * @see java.awt.event.AWTEventListenerProxy * @since 1.2 */ public void removeAWTEventListener(AWTEventListener listener) { AWTEventListener localL = deProxyAWTEventListener(listener); if (listener == null) { return; } SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION); } synchronized (this) { SelectiveAWTEventListener selectiveListener = listener2SelectiveListener.get(localL); if (selectiveListener != null) { listener2SelectiveListener.remove(localL); int[] listenerCalls = selectiveListener.getCalls(); for (int i = 0; i < LONG_BITS; i++) { calls[i] -= listenerCalls[i]; assert calls[i] >= 0 : "Negative Listeners count"; if (calls[i] == 0) { enabledOnToolkitMask &= ~(1L << i); } } } eventListener = ToolkitEventMulticaster.remove(eventListener, (selectiveListener == null) ? localL : selectiveListener); } } static boolean enabledOnToolkit(long eventMask) { return (enabledOnToolkitMask & eventMask) != 0; } synchronized int countAWTEventListeners(long eventMask) { int ci = 0; for (; eventMask != 0; eventMask >>>= 1, ci++) { } ci--; return calls[ci]; } /** * Returns an array of all the {@code AWTEventListener}s * registered on this toolkit. * If there is a security manager, its {@code checkPermission} * method is called with an * {@code AWTPermission("listenToAllAWTEvents")} permission. * This may result in a SecurityException. * Listeners can be returned * within {@code AWTEventListenerProxy} objects, which also contain * the event mask for the given listener. * Note that listener objects * added multiple times appear only once in the returned array. * * @return all of the {@code AWTEventListener}s or an empty * array if no listeners are currently registered * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method doesn't allow the operation. * @see #addAWTEventListener * @see #removeAWTEventListener * @see SecurityManager#checkPermission * @see java.awt.AWTEvent * @see java.awt.AWTPermission * @see java.awt.event.AWTEventListener * @see java.awt.event.AWTEventListenerProxy * @since 1.4 */ public AWTEventListener[] getAWTEventListeners() { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION); } synchronized (this) { EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener, AWTEventListener.class); AWTEventListener[] ret = new AWTEventListener[la.length]; for (int i = 0; i < la.length; i++) { SelectiveAWTEventListener sael = (SelectiveAWTEventListener) la[i]; AWTEventListener tempL = sael.getListener(); //assert tempL is not an AWTEventListenerProxy - we should // have weeded them all out // don't want to wrap a proxy inside a proxy ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL); } return ret; } } /** * Returns an array of all the {@code AWTEventListener}s * registered on this toolkit which listen to all of the event * types specified in the {@code eventMask} argument. * If there is a security manager, its {@code checkPermission} * method is called with an * {@code AWTPermission("listenToAllAWTEvents")} permission. * This may result in a SecurityException. * Listeners can be returned * within {@code AWTEventListenerProxy} objects, which also contain * the event mask for the given listener. * Note that listener objects * added multiple times appear only once in the returned array. * * @param eventMask the bitmask of event types to listen for * @return all of the {@code AWTEventListener}s registered * on this toolkit for the specified * event types, or an empty array if no such listeners * are currently registered * @throws SecurityException * if a security manager exists and its * {@code checkPermission} method doesn't allow the operation. * @see #addAWTEventListener * @see #removeAWTEventListener * @see SecurityManager#checkPermission * @see java.awt.AWTEvent * @see java.awt.AWTPermission * @see java.awt.event.AWTEventListener * @see java.awt.event.AWTEventListenerProxy * @since 1.4 */ public AWTEventListener[] getAWTEventListeners(long eventMask) { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION); } synchronized (this) { EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener, AWTEventListener.class); java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length); for (int i = 0; i < la.length; i++) { SelectiveAWTEventListener sael = (SelectiveAWTEventListener) la[i]; if ((sael.getEventMask() & eventMask) == eventMask) { //AWTEventListener tempL = sael.getListener(); list.add(new AWTEventListenerProxy(sael.getEventMask(), sael.getListener())); } } return list.toArray(new AWTEventListener[0]); } } /* * This method notifies any AWTEventListeners that an event * is about to be dispatched. * * @param theEvent the event which will be dispatched. */ void notifyAWTEventListeners(AWTEvent theEvent) { // This is a workaround for headless toolkits. It would be // better to override this method but it is declared package private. // "this instanceof" syntax defeats polymorphism. // --mm, 03/03/00 if (this instanceof HeadlessToolkit) { ((HeadlessToolkit) this).getUnderlyingToolkit().notifyAWTEventListeners(theEvent); return; } AWTEventListener eventListener = this.eventListener; if (eventListener != null) { eventListener.eventDispatched(theEvent); } } private static class ToolkitEventMulticaster extends AWTEventMulticaster implements AWTEventListener { // Implementation cloned from AWTEventMulticaster. ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) { super(a, b); } @SuppressWarnings("overloads") static AWTEventListener add(AWTEventListener a, AWTEventListener b) { if (a == null) return b; if (b == null) return a; return new ToolkitEventMulticaster(a, b); } @SuppressWarnings("overloads") static AWTEventListener remove(AWTEventListener l, AWTEventListener oldl) { return (AWTEventListener) removeInternal(l, oldl); } // #4178589: must overload remove(EventListener) to call our add() // instead of the static addInternal() so we allocate a // ToolkitEventMulticaster instead of an AWTEventMulticaster. // Note: this method is called by AWTEventListener.removeInternal(), // so its method signature must match AWTEventListener.remove(). protected EventListener remove(EventListener oldl) { if (oldl == a) return b; if (oldl == b) return a; AWTEventListener a2 = (AWTEventListener) removeInternal(a, oldl); AWTEventListener b2 = (AWTEventListener) removeInternal(b, oldl); if (a2 == a && b2 == b) { return this; // it's not here } return add(a2, b2); } public void eventDispatched(AWTEvent event) { ((AWTEventListener) a).eventDispatched(event); ((AWTEventListener) b).eventDispatched(event); } } private class SelectiveAWTEventListener implements AWTEventListener { AWTEventListener listener; private long eventMask; // This array contains the number of times to call the eventlistener // for each event type. int[] calls = new int[Toolkit.LONG_BITS]; public AWTEventListener getListener() { return listener; } public long getEventMask() { return eventMask; } public int[] getCalls() { return calls; } public void orEventMasks(long mask) { eventMask |= mask; // For each event bit set in mask, increment its call count. for (int i = 0; i < Toolkit.LONG_BITS; i++) { // If no bits are set, break out of loop. if (mask == 0) { break; } if ((mask & 1L) != 0) { // Always test bit 0. calls[i]++; } mask >>>= 1; // Right shift, fill with zeros on left. } } SelectiveAWTEventListener(AWTEventListener l, long mask) { listener = l; eventMask = mask; } public void eventDispatched(AWTEvent event) { long eventBit = 0; // Used to save the bit of the event type. if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 && event.id >= ComponentEvent.COMPONENT_FIRST && event.id <= ComponentEvent.COMPONENT_LAST) || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 && event.id >= ContainerEvent.CONTAINER_FIRST && event.id <= ContainerEvent.CONTAINER_LAST) || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 && event.id >= FocusEvent.FOCUS_FIRST && event.id <= FocusEvent.FOCUS_LAST) || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 && event.id >= KeyEvent.KEY_FIRST && event.id <= KeyEvent.KEY_LAST) || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 && event.id == MouseEvent.MOUSE_WHEEL) || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 && (event.id == MouseEvent.MOUSE_MOVED || event.id == MouseEvent.MOUSE_DRAGGED)) || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 && event.id != MouseEvent.MOUSE_MOVED && event.id != MouseEvent.MOUSE_DRAGGED && event.id != MouseEvent.MOUSE_WHEEL && event.id >= MouseEvent.MOUSE_FIRST && event.id <= MouseEvent.MOUSE_LAST) || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 && (event.id >= WindowEvent.WINDOW_FIRST && event.id <= WindowEvent.WINDOW_LAST)) || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 && event.id >= ActionEvent.ACTION_FIRST && event.id <= ActionEvent.ACTION_LAST) || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 && event.id >= AdjustmentEvent.ADJUSTMENT_FIRST && event.id <= AdjustmentEvent.ADJUSTMENT_LAST) || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 && event.id >= ItemEvent.ITEM_FIRST && event.id <= ItemEvent.ITEM_LAST) || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 && event.id >= TextEvent.TEXT_FIRST && event.id <= TextEvent.TEXT_LAST) || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 && event.id >= InputMethodEvent.INPUT_METHOD_FIRST && event.id <= InputMethodEvent.INPUT_METHOD_LAST) || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 && event.id >= PaintEvent.PAINT_FIRST && event.id <= PaintEvent.PAINT_LAST) || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 && event.id >= InvocationEvent.INVOCATION_FIRST && event.id <= InvocationEvent.INVOCATION_LAST) || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 && event.id == HierarchyEvent.HIERARCHY_CHANGED) || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 && (event.id == HierarchyEvent.ANCESTOR_MOVED || event.id == HierarchyEvent.ANCESTOR_RESIZED)) || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 && event.id == WindowEvent.WINDOW_STATE_CHANGED) || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 && (event.id == WindowEvent.WINDOW_GAINED_FOCUS || event.id == WindowEvent.WINDOW_LOST_FOCUS)) || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 && (event instanceof sun.awt.UngrabEvent))) { // Get the index of the call count for this event type. // Instead of using Math.log(...) we will calculate it with // bit shifts. That's what previous implementation looked like: // // int ci = (int) (Math.log(eventBit)/Math.log(2)); int ci = 0; for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) { } ci--; // Call the listener as many times as it was added for this // event type. for (int i = 0; i < calls[ci]; i++) { listener.eventDispatched(event); } } } } /** * Returns a map of visual attributes for the abstract level description * of the given input method highlight, or null if no mapping is found. * The style field of the input method highlight is ignored. The map * returned is unmodifiable. * @param highlight input method highlight * @return style attribute map, or {@code null} * @exception HeadlessException if * {@code GraphicsEnvironment.isHeadless} returns true * @see java.awt.GraphicsEnvironment#isHeadless * @since 1.3 */ public abstract Map<java.awt.font.TextAttribute, ?> mapInputMethodHighlight(InputMethodHighlight highlight) throws HeadlessException; private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) { if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) { return new DesktopPropertyChangeSupport(toolkit); } else { return new PropertyChangeSupport(toolkit); } } @SuppressWarnings("serial") private static class DesktopPropertyChangeSupport extends PropertyChangeSupport { private static final StringBuilder PROP_CHANGE_SUPPORT_KEY = new StringBuilder( "desktop property change support key"); private final Object source; public DesktopPropertyChangeSupport(Object sourceBean) { super(sourceBean); source = sourceBean; } @Override public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null == pcs) { pcs = new PropertyChangeSupport(source); AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs); } pcs.addPropertyChangeListener(propertyName, listener); } @Override public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null != pcs) { pcs.removePropertyChangeListener(propertyName, listener); } } @Override public synchronized PropertyChangeListener[] getPropertyChangeListeners() { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null != pcs) { return pcs.getPropertyChangeListeners(); } else { return new PropertyChangeListener[0]; } } @Override public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName) { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null != pcs) { return pcs.getPropertyChangeListeners(propertyName); } else { return new PropertyChangeListener[0]; } } @Override public synchronized void addPropertyChangeListener(PropertyChangeListener listener) { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null == pcs) { pcs = new PropertyChangeSupport(source); AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs); } pcs.addPropertyChangeListener(listener); } @Override public synchronized void removePropertyChangeListener(PropertyChangeListener listener) { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null != pcs) { pcs.removePropertyChangeListener(listener); } } /* * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport * use this method. If this will be changed we will need to change this class. */ @Override public void firePropertyChange(final PropertyChangeEvent evt) { Object oldValue = evt.getOldValue(); Object newValue = evt.getNewValue(); String propertyName = evt.getPropertyName(); if (oldValue != null && newValue != null && oldValue.equals(newValue)) { return; } Runnable updater = new Runnable() { public void run() { PropertyChangeSupport pcs = (PropertyChangeSupport) AppContext.getAppContext() .get(PROP_CHANGE_SUPPORT_KEY); if (null != pcs) { pcs.firePropertyChange(evt); } } }; final AppContext currentAppContext = AppContext.getAppContext(); for (AppContext appContext : AppContext.getAppContexts()) { if (null == appContext || appContext.isDisposed()) { continue; } if (currentAppContext == appContext) { updater.run(); } else { final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT); SunToolkit.postEvent(appContext, e); } } } } /** * Reports whether events from extra mouse buttons are allowed to be processed and posted into * {@code EventQueue}. * <br> * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons} * property before the {@code Toolkit} class initialization. This setting could be done on the application * startup by the following command: * <pre> * java -Dsun.awt.enableExtraMouseButtons=false Application * </pre> * Alternatively, the property could be set in the application by using the following code: * <pre> * System.setProperty("sun.awt.enableExtraMouseButtons", "true"); * </pre> * before the {@code Toolkit} class initialization. * If not set by the time of the {@code Toolkit} class initialization, this property will be * initialized with {@code true}. * Changing this value after the {@code Toolkit} class initialization will have no effect. * * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted; * {@code false} otherwise * @see System#getProperty(String propertyName) * @see System#setProperty(String propertyName, String value) * @see java.awt.EventQueue * @since 1.7 */ public boolean areExtraMouseButtonsEnabled() throws HeadlessException { GraphicsEnvironment.checkHeadless(); return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled(); } }