JDK14/Java14源码在线阅读
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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 &&
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