JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, 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.image.ColorModel;
import sun.awt.AWTAccessor;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
/**
* The <code>GraphicsDevice</code> class describes the graphics devices
* that might be available in a particular graphics environment. These
* include screen and printer devices. Note that there can be many screens
* and many printers in an instance of {@link GraphicsEnvironment}. Each
* graphics device has one or more {@link GraphicsConfiguration} objects
* associated with it. These objects specify the different configurations
* in which the <code>GraphicsDevice</code> can be used.
* <p>
* In a multi-screen environment, the <code>GraphicsConfiguration</code>
* objects can be used to render components on multiple screens. The
* following code sample demonstrates how to create a <code>JFrame</code>
* object for each <code>GraphicsConfiguration</code> on each screen
* device in the <code>GraphicsEnvironment</code>:
* <pre>{@code
* GraphicsEnvironment ge = GraphicsEnvironment.
* getLocalGraphicsEnvironment();
* GraphicsDevice[] gs = ge.getScreenDevices();
* for (int j = 0; j < gs.length; j++) {
* GraphicsDevice gd = gs[j];
* GraphicsConfiguration[] gc =
* gd.getConfigurations();
* for (int i=0; i < gc.length; i++) {
* JFrame f = new
* JFrame(gs[j].getDefaultConfiguration());
* Canvas c = new Canvas(gc[i]);
* Rectangle gcBounds = gc[i].getBounds();
* int xoffs = gcBounds.x;
* int yoffs = gcBounds.y;
* f.getContentPane().add(c);
* f.setLocation((i*50)+xoffs, (i*60)+yoffs);
* f.show();
* }
* }
* }</pre>
* <p>
* For more information on full-screen exclusive mode API, see the
* <a href="https://docs.oracle.com/javase/tutorial/extra/fullscreen/index.html">
* Full-Screen Exclusive Mode API Tutorial</a>.
*
* @see GraphicsEnvironment
* @see GraphicsConfiguration
*/
public abstract class GraphicsDevice {
private Window fullScreenWindow;
private AppContext fullScreenAppContext; // tracks which AppContext
// created the FS window
// this lock is used for making synchronous changes to the AppContext's
// current full screen window
private final Object fsAppContextLock = new Object();
private Rectangle windowedModeBounds;
/**
* This is an abstract class that cannot be instantiated directly.
* Instances must be obtained from a suitable factory or query method.
* @see GraphicsEnvironment#getScreenDevices
* @see GraphicsEnvironment#getDefaultScreenDevice
* @see GraphicsConfiguration#getDevice
*/
protected GraphicsDevice() {
}
/**
* Device is a raster screen.
*/
public final static int TYPE_RASTER_SCREEN = 0;
/**
* Device is a printer.
*/
public final static int TYPE_PRINTER = 1;
/**
* Device is an image buffer. This buffer can reside in device
* or system memory but it is not physically viewable by the user.
*/
public final static int TYPE_IMAGE_BUFFER = 2;
/**
* Kinds of translucency supported by the underlying system.
*
* @see #isWindowTranslucencySupported
*
* @since 1.7
*/
public static enum WindowTranslucency {
/**
* Represents support in the underlying system for windows each pixel
* of which is guaranteed to be either completely opaque, with
* an alpha value of 1.0, or completely transparent, with an alpha
* value of 0.0.
*/
PERPIXEL_TRANSPARENT,
/**
* Represents support in the underlying system for windows all of
* the pixels of which have the same alpha value between or including
* 0.0 and 1.0.
*/
TRANSLUCENT,
/**
* Represents support in the underlying system for windows that
* contain or might contain pixels with arbitrary alpha values
* between and including 0.0 and 1.0.
*/
PERPIXEL_TRANSLUCENT;
}
/**
* Returns the type of this <code>GraphicsDevice</code>.
* @return the type of this <code>GraphicsDevice</code>, which can
* either be TYPE_RASTER_SCREEN, TYPE_PRINTER or TYPE_IMAGE_BUFFER.
* @see #TYPE_RASTER_SCREEN
* @see #TYPE_PRINTER
* @see #TYPE_IMAGE_BUFFER
*/
public abstract int getType();
/**
* Returns the identification string associated with this
* <code>GraphicsDevice</code>.
* <p>
* A particular program might use more than one
* <code>GraphicsDevice</code> in a <code>GraphicsEnvironment</code>.
* This method returns a <code>String</code> identifying a
* particular <code>GraphicsDevice</code> in the local
* <code>GraphicsEnvironment</code>. Although there is
* no public method to set this <code>String</code>, a programmer can
* use the <code>String</code> for debugging purposes. Vendors of
* the Java™ Runtime Environment can
* format the return value of the <code>String</code>. To determine
* how to interpret the value of the <code>String</code>, contact the
* vendor of your Java Runtime. To find out who the vendor is, from
* your program, call the
* {@link System#getProperty(String) getProperty} method of the
* System class with "java.vendor".
* @return a <code>String</code> that is the identification
* of this <code>GraphicsDevice</code>.
*/
public abstract String getIDstring();
/**
* Returns all of the <code>GraphicsConfiguration</code>
* objects associated with this <code>GraphicsDevice</code>.
* @return an array of <code>GraphicsConfiguration</code>
* objects that are associated with this
* <code>GraphicsDevice</code>.
*/
public abstract GraphicsConfiguration[] getConfigurations();
/**
* Returns the default <code>GraphicsConfiguration</code>
* associated with this <code>GraphicsDevice</code>.
* @return the default <code>GraphicsConfiguration</code>
* of this <code>GraphicsDevice</code>.
*/
public abstract GraphicsConfiguration getDefaultConfiguration();
/**
* Returns the "best" configuration possible that passes the
* criteria defined in the {@link GraphicsConfigTemplate}.
* @param gct the <code>GraphicsConfigTemplate</code> object
* used to obtain a valid <code>GraphicsConfiguration</code>
* @return a <code>GraphicsConfiguration</code> that passes
* the criteria defined in the specified
* <code>GraphicsConfigTemplate</code>.
* @see GraphicsConfigTemplate
*/
public GraphicsConfiguration
getBestConfiguration(GraphicsConfigTemplate gct) {
GraphicsConfiguration[] configs = getConfigurations();
return gct.getBestConfiguration(configs);
}
/**
* Returns <code>true</code> if this <code>GraphicsDevice</code>
* supports full-screen exclusive mode.
* If a SecurityManager is installed, its
* <code>checkPermission</code> method will be called
* with <code>AWTPermission("fullScreenExclusive")</code>.
* <code>isFullScreenSupported</code> returns true only if
* that permission is granted.
* @return whether full-screen exclusive mode is available for
* this graphics device
* @see java.awt.AWTPermission
* @since 1.4
*/
public boolean isFullScreenSupported() {
return false;
}
/**
* Enter full-screen mode, or return to windowed mode. The entered
* full-screen mode may be either exclusive or simulated. Exclusive
* mode is only available if <code>isFullScreenSupported</code>
* returns <code>true</code>.
* <p>
* Exclusive mode implies:
* <ul>
* <li>Windows cannot overlap the full-screen window. All other application
* windows will always appear beneath the full-screen window in the Z-order.
* <li>There can be only one full-screen window on a device at any time,
* so calling this method while there is an existing full-screen Window
* will cause the existing full-screen window to
* return to windowed mode.
* <li>Input method windows are disabled. It is advisable to call
* <code>Component.enableInputMethods(false)</code> to make a component
* a non-client of the input method framework.
* </ul>
* <p>
* The simulated full-screen mode places and resizes the window to the maximum
* possible visible area of the screen. However, the native windowing system
* may modify the requested geometry-related data, so that the {@code Window} object
* is placed and sized in a way that corresponds closely to the desktop settings.
* <p>
* When entering full-screen mode, if the window to be used as a
* full-screen window is not visible, this method will make it visible.
* It will remain visible when returning to windowed mode.
* <p>
* When entering full-screen mode, all the translucency effects are reset for
* the window. Its shape is set to {@code null}, the opacity value is set to
* 1.0f, and the background color alpha is set to 255 (completely opaque).
* These values are not restored when returning to windowed mode.
* <p>
* It is unspecified and platform-dependent how decorated windows operate
* in full-screen mode. For this reason, it is recommended to turn off
* the decorations in a {@code Frame} or {@code Dialog} object by using the
* {@code setUndecorated} method.
* <p>
* When returning to windowed mode from an exclusive full-screen window,
* any display changes made by calling {@code setDisplayMode} are
* automatically restored to their original state.
*
* @param w a window to use as the full-screen window; {@code null}
* if returning to windowed mode. Some platforms expect the
* fullscreen window to be a top-level component (i.e., a {@code Frame});
* therefore it is preferable to use a {@code Frame} here rather than a
* {@code Window}.
*
* @see #isFullScreenSupported
* @see #getFullScreenWindow
* @see #setDisplayMode
* @see Component#enableInputMethods
* @see Component#setVisible
* @see Frame#setUndecorated
* @see Dialog#setUndecorated
*
* @since 1.4
*/
public void setFullScreenWindow(Window w) {
if (w != null) {
if (w.getShape() != null) {
w.setShape(null);
}
if (w.getOpacity() < 1.0f) {
w.setOpacity(1.0f);
}
if (!w.isOpaque()) {
Color bgColor = w.getBackground();
bgColor = new Color(bgColor.getRed(), bgColor.getGreen(),
bgColor.getBlue(), 255);
w.setBackground(bgColor);
}
// Check if this window is in fullscreen mode on another device.
final GraphicsConfiguration gc = w.getGraphicsConfiguration();
if (gc != null && gc.getDevice() != this
&& gc.getDevice().getFullScreenWindow() == w) {
gc.getDevice().setFullScreenWindow(null);
}
}
if (fullScreenWindow != null && windowedModeBounds != null) {
// if the window went into fs mode before it was realized it may
// have (0,0) dimensions
if (windowedModeBounds.width == 0) windowedModeBounds.width = 1;
if (windowedModeBounds.height == 0) windowedModeBounds.height = 1;
fullScreenWindow.setBounds(windowedModeBounds);
}
// Set the full screen window
synchronized (fsAppContextLock) {
// Associate fullscreen window with current AppContext
if (w == null) {
fullScreenAppContext = null;
} else {
fullScreenAppContext = AppContext.getAppContext();
}
fullScreenWindow = w;
}
if (fullScreenWindow != null) {
windowedModeBounds = fullScreenWindow.getBounds();
// Note that we use the graphics configuration of the device,
// not the window's, because we're setting the fs window for
// this device.
final GraphicsConfiguration gc = getDefaultConfiguration();
final Rectangle screenBounds = gc.getBounds();
if (SunToolkit.isDispatchThreadForAppContext(fullScreenWindow)) {
// Update graphics configuration here directly and do not wait
// asynchronous notification from the peer. Note that
// setBounds() will reset a GC, if it was set incorrectly.
fullScreenWindow.setGraphicsConfiguration(gc);
}
fullScreenWindow.setBounds(screenBounds.x, screenBounds.y,
screenBounds.width, screenBounds.height);
fullScreenWindow.setVisible(true);
fullScreenWindow.toFront();
}
}
/**
* Returns the <code>Window</code> object representing the
* full-screen window if the device is in full-screen mode.
*
* @return the full-screen window, or <code>null</code> if the device is
* not in full-screen mode.
* @see #setFullScreenWindow(Window)
* @since 1.4
*/
public Window getFullScreenWindow() {
Window returnWindow = null;
synchronized (fsAppContextLock) {
// Only return a handle to the current fs window if we are in the
// same AppContext that set the fs window
if (fullScreenAppContext == AppContext.getAppContext()) {
returnWindow = fullScreenWindow;
}
}
return returnWindow;
}
/**
* Returns <code>true</code> if this <code>GraphicsDevice</code>
* supports low-level display changes.
* On some platforms low-level display changes may only be allowed in
* full-screen exclusive mode (i.e., if {@link #isFullScreenSupported()}
* returns {@code true} and the application has already entered
* full-screen mode using {@link #setFullScreenWindow}).
* @return whether low-level display changes are supported for this
* graphics device.
* @see #isFullScreenSupported
* @see #setDisplayMode
* @see #setFullScreenWindow
* @since 1.4
*/
public boolean isDisplayChangeSupported() {
return false;
}
/**
* Sets the display mode of this graphics device. This is only allowed
* if {@link #isDisplayChangeSupported()} returns {@code true} and may
* require first entering full-screen exclusive mode using
* {@link #setFullScreenWindow} providing that full-screen exclusive mode is
* supported (i.e., {@link #isFullScreenSupported()} returns
* {@code true}).
* <p>
*
* The display mode must be one of the display modes returned by
* {@link #getDisplayModes()}, with one exception: passing a display mode
* with {@link DisplayMode#REFRESH_RATE_UNKNOWN} refresh rate will result in
* selecting a display mode from the list of available display modes with
* matching width, height and bit depth.
* However, passing a display mode with {@link DisplayMode#BIT_DEPTH_MULTI}
* for bit depth is only allowed if such mode exists in the list returned by
* {@link #getDisplayModes()}.
* <p>
* Example code:
* <pre><code>
* Frame frame;
* DisplayMode newDisplayMode;
* GraphicsDevice gd;
* // create a Frame, select desired DisplayMode from the list of modes
* // returned by gd.getDisplayModes() ...
*
* if (gd.isFullScreenSupported()) {
* gd.setFullScreenWindow(frame);
* } else {
* // proceed in non-full-screen mode
* frame.setSize(...);
* frame.setLocation(...);
* frame.setVisible(true);
* }
*
* if (gd.isDisplayChangeSupported()) {
* gd.setDisplayMode(newDisplayMode);
* }
* </code></pre>
*
* @param dm The new display mode of this graphics device.
* @exception IllegalArgumentException if the <code>DisplayMode</code>
* supplied is <code>null</code>, or is not available in the array returned
* by <code>getDisplayModes</code>
* @exception UnsupportedOperationException if
* <code>isDisplayChangeSupported</code> returns <code>false</code>
* @see #getDisplayMode
* @see #getDisplayModes
* @see #isDisplayChangeSupported
* @since 1.4
*/
public void setDisplayMode(DisplayMode dm) {
throw new UnsupportedOperationException("Cannot change display mode");
}
/**
* Returns the current display mode of this
* <code>GraphicsDevice</code>.
* The returned display mode is allowed to have a refresh rate
* {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate.
* Likewise, the returned display mode is allowed to have a bit depth
* {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple
* bit depths are supported.
* @return the current display mode of this graphics device.
* @see #setDisplayMode(DisplayMode)
* @since 1.4
*/
public DisplayMode getDisplayMode() {
GraphicsConfiguration gc = getDefaultConfiguration();
Rectangle r = gc.getBounds();
ColorModel cm = gc.getColorModel();
return new DisplayMode(r.width, r.height, cm.getPixelSize(), 0);
}
/**
* Returns all display modes available for this
* <code>GraphicsDevice</code>.
* The returned display modes are allowed to have a refresh rate
* {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate.
* Likewise, the returned display modes are allowed to have a bit depth
* {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple
* bit depths are supported.
* @return all of the display modes available for this graphics device.
* @since 1.4
*/
public DisplayMode[] getDisplayModes() {
return new DisplayMode[] { getDisplayMode() };
}
/**
* This method returns the number of bytes available in
* accelerated memory on this device.
* Some images are created or cached
* in accelerated memory on a first-come,
* first-served basis. On some operating systems,
* this memory is a finite resource. Calling this method
* and scheduling the creation and flushing of images carefully may
* enable applications to make the most efficient use of
* that finite resource.
* <br>
* Note that the number returned is a snapshot of how much
* memory is available; some images may still have problems
* being allocated into that memory. For example, depending
* on operating system, driver, memory configuration, and
* thread situations, the full extent of the size reported
* may not be available for a given image. There are further
* inquiry methods on the {@link ImageCapabilities} object
* associated with a VolatileImage that can be used to determine
* whether a particular VolatileImage has been created in accelerated
* memory.
* @return number of bytes available in accelerated memory.
* A negative return value indicates that the amount of accelerated memory
* on this GraphicsDevice is indeterminate.
* @see java.awt.image.VolatileImage#flush
* @see ImageCapabilities#isAccelerated
* @since 1.4
*/
public int getAvailableAcceleratedMemory() {
return -1;
}
/**
* Returns whether the given level of translucency is supported by
* this graphics device.
*
* @param translucencyKind a kind of translucency support
* @return whether the given translucency kind is supported
*
* @since 1.7
*/
public boolean isWindowTranslucencySupported(WindowTranslucency translucencyKind) {
switch (translucencyKind) {
case PERPIXEL_TRANSPARENT:
return isWindowShapingSupported();
case TRANSLUCENT:
return isWindowOpacitySupported();
case PERPIXEL_TRANSLUCENT:
return isWindowPerpixelTranslucencySupported();
}
return false;
}
/**
* Returns whether the windowing system supports changing the shape
* of top-level windows.
* Note that this method may sometimes return true, but the native
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java