/*
* @(#)Component.java 1.389 05/01/04
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Vector;
import java.util.Locale;
import java.util.EventListener;
import java.util.Iterator;
import java.util.HashSet;
import java.util.Set;
import java.util.Collections;
import java.awt.peer.ComponentPeer;
import java.awt.peer.ContainerPeer;
import java.awt.peer.LightweightPeer;
import java.awt.image.BufferStrategy;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.image.ColorModel;
import java.awt.image.VolatileImage;
import java.awt.event.*;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragSource;
import java.awt.dnd.DragSourceContext;
import java.awt.dnd.DragSourceListener;
import java.awt.dnd.InvalidDnDOperationException;
import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.awt.event.InputMethodListener;
import java.awt.event.InputMethodEvent;
import java.awt.im.InputContext;
import java.awt.im.InputMethodRequests;
import java.awt.dnd.DropTarget;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.accessibility.*;
import java.awt.GraphicsConfiguration;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.accessibility.*;
import java.util.logging.*;
import sun.security.action.GetPropertyAction;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import sun.awt.ConstrainableGraphics;
import sun.awt.DebugHelper;
import sun.awt.WindowClosingListener;
import sun.awt.WindowClosingSupport;
import sun.awt.GlobalCursorManager;
import sun.awt.dnd.SunDropTargetEvent;
import sun.awt.im.CompositionArea;
/**
* A <em>component</em> is an object having a graphical representation
* that can be displayed on the screen and that can interact with the
* user. Examples of components are the buttons, checkboxes, and scrollbars
* of a typical graphical user interface. <p>
* The <code>Component</code> class is the abstract superclass of
* the nonmenu-related Abstract Window Toolkit components. Class
* <code>Component</code> can also be extended directly to create a
* lightweight component. A lightweight component is a component that is
* not associated with a native opaque window.
* <p>
* <h3>Serialization</h3>
* It is important to note that only AWT listeners which conform
* to the <code>Serializable</code> protocol will be saved when
* the object is stored. If an AWT object has listeners that
* aren't marked serializable, they will be dropped at
* <code>writeObject</code> time. Developers will need, as always,
* to consider the implications of making an object serializable.
* One situation to watch out for is this:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp implements ActionListener, Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* MyApp()
* {
* // Oops, now aButton has a listener with a reference
* // to bigOne!
* aButton.addActionListener(this);
* }
*
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
* </pre>
* In this example, serializing <code>aButton</code> by itself
* will cause <code>MyApp</code> and everything it refers to
* to be serialized as well. The problem is that the listener
* is serializable by coincidence, not by design. To separate
* the decisions about <code>MyApp</code> and the
* <code>ActionListener</code> being serializable one can use a
* nested class, as in the following example:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp java.io.Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* class MyActionListener implements ActionListener
* {
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
*
* MyApp()
* {
* aButton.addActionListener(new MyActionListener());
* }
* }
* </pre>
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://java.sun.com/products/jfc/tsc/articles/painting/index.html">Painting in AWT and Swing</a>.
* <p>
* For details on the focus subsystem, see
* <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html">
* How to Use the Focus Subsystem</a>,
* a section in <em>The Java Tutorial</em>, and the
* <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* for more information.
*
* @version 1.389, 01/04/05
* @author Arthur van Hoff
* @author Sami Shaio
*/
public abstract class Component implements ImageObserver, MenuContainer,
Serializable
{
private static final Logger focusLog = Logger.getLogger("java.awt.focus.Component");
private static final Logger log = Logger.getLogger("java.awt.Component");
/**
* The peer of the component. The peer implements the component's
* behavior. The peer is set when the <code>Component</code> is
* added to a container that also is a peer.
* @see #addNotify
* @see #removeNotify
*/
transient ComponentPeer peer;
/**
* The parent of the object. It may be <code>null</code>
* for top-level components.
* @see #getParent
*/
transient Container parent;
/**
* The <code>AppContext</code> of the component. Applets/Plugin may
* change the AppContext.
*/
transient AppContext appContext;
/**
* The x position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int x;
/**
* The y position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int y;
/**
* The width of the component.
*
* @serial
* @see #getSize
*/
int width;
/**
* The height of the component.
*
* @serial
* @see #getSize
*/
int height;
/**
* The foreground color for this component.
* <code>foreground</code> can be <code>null</code>.
*
* @serial
* @see #getForeground
* @see #setForeground
*/
Color foreground;
/**
* The background color for this component.
* <code>background</code> can be <code>null</code>.
*
* @serial
* @see #getBackground
* @see #setBackground
*/
Color background;
/**
* The font used by this component.
* The <code>font</code> can be <code>null</code>.
*
* @serial
* @see #getFont
* @see #setFont
*/
Font font;
/**
* The font which the peer is currently using.
* (<code>null</code> if no peer exists.)
*/
Font peerFont;
/**
* The cursor displayed when pointer is over this component.
* This value can be <code>null</code>.
*
* @serial
* @see #getCursor
* @see #setCursor
*/
Cursor cursor;
/**
* The locale for the component.
*
* @serial
* @see #getLocale
* @see #setLocale
*/
JAVA API的源代码
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JAVA API的源代码 （2000个子文件） 
Component.class 74KB Container.class 42KB BigInteger.class 38KB X509CertSelector.class 33KB Pattern.class 33KB DecimalFormat.class 32KB KeyboardFocusManager.class 31KB TextLayout.class 30KB Class.class 30KB ObjectStreamClass.class 30KB Arrays.class 29KB ComponentColorModel.class 28KB Formatter$FormatSpecifier.class 28KB BigDecimal.class 28KB AffineTransform.class 27KB CharacterData00.class 27KB GregorianCalendar.class 27KB URI.class 26KB Scanner.class 26KB Window.class 26KB Font.class 25KB Collections.class 24KB ObjectInputStream.class 23KB ClassLoader.class 22KB TextLine.class 22KB Introspector.class 21KB SimpleDateFormat.class 21KB Character.class 20KB KeyEvent.class 20KB String.class 20KB Character$UnicodeBlock.class 19KB ICC_Profile.class 19KB BufferedImage.class 19KB BeanContextSupport.class 18KB Toolkit.class 18KB Calendar.class 18KB TreeMap.class 18KB SocksSocketImpl.class 17KB MutableBigInteger.class 17KB DefaultKeyboardFocusManager.class 17KB Raster.class 16KB ObjectOutputStream.class 16KB SystemFlavorMap.class 16KB WindowsPreferences.class 16KB ColorConvertOp.class 16KB Security.class 16KB MessageFormat.class 16KB AbstractPreferences.class 16KB Bits.class 16KB ColorModel.class 15KB URLConnection.class 15KB DataFlavor.class 15KB DirectByteBuffer.class 15KB Logger.class 15KB IndexColorModel.class 14KB SimpleTimeZone.class 14KB Locale.class 14KB ThreadPoolExecutor.class 14KB AWTEventMulticaster.class 14KB Date.class 14KB LogManager.class 14KB Provider.class 14KB BeanContextServicesSupport.class 14KB Socket.class 14KB DirectColorModel.class 14KB NumericShaper.class 14KB GridBagLayout.class 14KB Thread.class 13KB CopyOnWriteArrayList.class 13KB AbstractQueuedSynchronizer.class 13KB File.class 13KB ComponentSampleModel.class 13KB AbstractStringBuilder.class 13KB ObjectInputStream$BlockDataInputStream.class 13KB List.class 13KB StringBuffer.class 13KB InetAddress.class 13KB HashMap.class 13KB URL.class 12KB Hashtable.class 12KB Signature.class 12KB CubicCurve2D.class 12KB AttributedString.class 12KB TextMeasurer.class 12KB BitSet.class 12KB DatagramSocket.class 12KB LinkedBlockingQueue.class 11KB Frame.class 11KB EventQueue.class 11KB Color.class 11KB IdentityHashMap.class 11KB Method.class 11KB DragSource.class 11KB SampleModel.class 11KB SecurityManager.class 11KB Constructor.class 11KB ResourceBundle.class 11KB PageAttributes$MediaType.class 11KB Provider$Service.class 11KB Vector.class 11KB共 2000 条
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