author | darcy |
Fri, 24 Jan 2014 07:16:53 -0800 | |
changeset 22574 | 7f8ce0c8c20a |
parent 21278 | ef8a3a2a72f2 |
child 25201 | 4adc75e0c4e5 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing; |
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import java.awt.*; |
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import java.awt.event.*; |
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import java.applet.Applet; |
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import java.beans.PropertyChangeListener; |
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import java.util.Locale; |
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import java.util.Vector; |
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import java.io.Serializable; |
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import javax.accessibility.*; |
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/** |
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* An extended version of <code>java.applet.Applet</code> that adds support for |
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* the JFC/Swing component architecture. |
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* You can find task-oriented documentation about using <code>JApplet</code> |
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* in <em>The Java Tutorial</em>, |
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* in the section |
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* <a |
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href="http://docs.oracle.com/javase/tutorial/uiswing/components/applet.html">How to Make Applets</a>. |
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* <p> |
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* The <code>JApplet</code> class is slightly incompatible with |
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* <code>java.applet.Applet</code>. <code>JApplet</code> contains a |
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* <code>JRootPane</code> as its only child. The <code>contentPane</code> |
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* should be the parent of any children of the <code>JApplet</code>. |
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* As a convenience, the {@code add}, {@code remove}, and {@code setLayout} |
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* methods of this class are overridden, so that they delegate calls |
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* to the corresponding methods of the {@code ContentPane}. |
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* For example, you can add a child component to an applet as follows: |
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* <pre> |
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* applet.add(child); |
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* </pre> |
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* |
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* And the child will be added to the <code>contentPane</code>. |
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* The <code>contentPane</code> will always be non-<code>null</code>. |
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* Attempting to set it to <code>null</code> will cause the |
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* <code>JApplet</code> to throw an exception. The default |
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* <code>contentPane</code> will have a <code>BorderLayout</code> |
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* manager set on it. |
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* Refer to {@link javax.swing.RootPaneContainer} |
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* for details on adding, removing and setting the <code>LayoutManager</code> |
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* of a <code>JApplet</code>. |
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* <p> |
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* Please see the <code>JRootPane</code> documentation for a |
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* complete description of the <code>contentPane</code>, <code>glassPane</code>, |
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* and <code>layeredPane</code> properties. |
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* <p> |
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* <strong>Warning:</strong> Swing is not thread safe. For more |
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* information see <a |
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* href="package-summary.html#threading">Swing's Threading |
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* Policy</a>. |
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* <p> |
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* <strong>Warning:</strong> |
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* Serialized objects of this class will not be compatible with |
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* future Swing releases. The current serialization support is |
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* appropriate for short term storage or RMI between applications running |
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* the same version of Swing. As of 1.4, support for long term storage |
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* of all JavaBeans™ |
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* has been added to the <code>java.beans</code> package. |
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* Please see {@link java.beans.XMLEncoder}. |
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* |
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* @see javax.swing.RootPaneContainer |
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* @beaninfo |
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* attribute: isContainer true |
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* attribute: containerDelegate getContentPane |
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* description: Swing's Applet subclass. |
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* |
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* @author Arnaud Weber |
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*/ |
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@SuppressWarnings("serial") // Same-version serialization only |
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public class JApplet extends Applet implements Accessible, |
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RootPaneContainer, |
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TransferHandler.HasGetTransferHandler |
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{ |
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/** |
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* @see #getRootPane |
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* @see #setRootPane |
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*/ |
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protected JRootPane rootPane; |
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/** |
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* If true then calls to <code>add</code> and <code>setLayout</code> |
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* will be forwarded to the <code>contentPane</code>. This is initially |
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* false, but is set to true when the <code>JApplet</code> is constructed. |
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* |
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* @see #isRootPaneCheckingEnabled |
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* @see #setRootPaneCheckingEnabled |
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* @see javax.swing.RootPaneContainer |
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*/ |
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protected boolean rootPaneCheckingEnabled = false; |
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/** |
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* The <code>TransferHandler</code> for this applet. |
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*/ |
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private TransferHandler transferHandler; |
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/** |
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* Creates a swing applet instance. |
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* <p> |
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* This constructor sets the component's locale property to the value |
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* returned by <code>JComponent.getDefaultLocale</code>. |
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* |
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* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
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* returns true. |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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* @see JComponent#getDefaultLocale |
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*/ |
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public JApplet() throws HeadlessException { |
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super(); |
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// Check the timerQ and restart if necessary. |
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TimerQueue q = TimerQueue.sharedInstance(); |
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if(q != null) { |
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q.startIfNeeded(); |
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} |
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/* Workaround for bug 4155072. The shared double buffer image |
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* may hang on to a reference to this applet; unfortunately |
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* Image.getGraphics() will continue to call JApplet.getForeground() |
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* and getBackground() even after this applet has been destroyed. |
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* So we ensure that these properties are non-null here. |
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*/ |
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setForeground(Color.black); |
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setBackground(Color.white); |
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setLocale( JComponent.getDefaultLocale() ); |
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setLayout(new BorderLayout()); |
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setRootPane(createRootPane()); |
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setRootPaneCheckingEnabled(true); |
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setFocusTraversalPolicyProvider(true); |
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sun.awt.SunToolkit.checkAndSetPolicy(this); |
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enableEvents(AWTEvent.KEY_EVENT_MASK); |
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} |
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/** Called by the constructor methods to create the default rootPane. */ |
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protected JRootPane createRootPane() { |
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JRootPane rp = new JRootPane(); |
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// NOTE: this uses setOpaque vs LookAndFeel.installProperty as there |
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// is NO reason for the RootPane not to be opaque. For painting to |
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// work the contentPane must be opaque, therefor the RootPane can |
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// also be opaque. |
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rp.setOpaque(true); |
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return rp; |
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} |
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/** |
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* Sets the {@code transferHandler} property, which is a mechanism to |
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* support transfer of data into this component. Use {@code null} |
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* if the component does not support data transfer operations. |
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* <p> |
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* If the system property {@code suppressSwingDropSupport} is {@code false} |
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* (the default) and the current drop target on this component is either |
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* {@code null} or not a user-set drop target, this method will change the |
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* drop target as follows: If {@code newHandler} is {@code null} it will |
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* clear the drop target. If not {@code null} it will install a new |
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* {@code DropTarget}. |
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* <p> |
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* Note: When used with {@code JApplet}, {@code TransferHandler} only |
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* provides data import capability, as the data export related methods |
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* are currently typed to {@code JComponent}. |
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* <p> |
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* Please see |
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* <a href="http://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html"> |
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* How to Use Drag and Drop and Data Transfer</a>, a section in |
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* <em>The Java Tutorial</em>, for more information. |
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* |
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* @param newHandler the new {@code TransferHandler} |
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* |
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* @see TransferHandler |
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* @see #getTransferHandler |
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* @see java.awt.Component#setDropTarget |
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* @since 1.6 |
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* |
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* @beaninfo |
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* bound: true |
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* hidden: true |
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* description: Mechanism for transfer of data into the component |
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*/ |
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public void setTransferHandler(TransferHandler newHandler) { |
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TransferHandler oldHandler = transferHandler; |
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transferHandler = newHandler; |
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SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler); |
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firePropertyChange("transferHandler", oldHandler, newHandler); |
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} |
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/** |
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* Gets the <code>transferHandler</code> property. |
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* |
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* @return the value of the <code>transferHandler</code> property |
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* |
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* @see TransferHandler |
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* @see #setTransferHandler |
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* @since 1.6 |
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*/ |
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public TransferHandler getTransferHandler() { |
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return transferHandler; |
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} |
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/** |
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* Just calls <code>paint(g)</code>. This method was overridden to |
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* prevent an unnecessary call to clear the background. |
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*/ |
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public void update(Graphics g) { |
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paint(g); |
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} |
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/** |
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* Sets the menubar for this applet. |
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* @param menuBar the menubar being placed in the applet |
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* |
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* @see #getJMenuBar |
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* |
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* @beaninfo |
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* hidden: true |
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* description: The menubar for accessing pulldown menus from this applet. |
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*/ |
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public void setJMenuBar(JMenuBar menuBar) { |
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getRootPane().setMenuBar(menuBar); |
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} |
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/** |
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* Returns the menubar set on this applet. |
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* |
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* @see #setJMenuBar |
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*/ |
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public JMenuBar getJMenuBar() { |
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return getRootPane().getMenuBar(); |
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} |
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/** |
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* Returns whether calls to <code>add</code> and |
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* <code>setLayout</code> are forwarded to the <code>contentPane</code>. |
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* |
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* @return true if <code>add</code> and <code>setLayout</code> |
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* are forwarded; false otherwise |
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* |
263 |
* @see #addImpl |
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* @see #setLayout |
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* @see #setRootPaneCheckingEnabled |
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266 |
* @see javax.swing.RootPaneContainer |
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*/ |
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protected boolean isRootPaneCheckingEnabled() { |
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return rootPaneCheckingEnabled; |
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} |
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/** |
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274 |
* Sets whether calls to <code>add</code> and |
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275 |
* <code>setLayout</code> are forwarded to the <code>contentPane</code>. |
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276 |
* |
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277 |
* @param enabled true if <code>add</code> and <code>setLayout</code> |
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* are forwarded, false if they should operate directly on the |
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* <code>JApplet</code>. |
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* |
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* @see #addImpl |
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* @see #setLayout |
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* @see #isRootPaneCheckingEnabled |
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* @see javax.swing.RootPaneContainer |
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* @beaninfo |
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* hidden: true |
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* description: Whether the add and setLayout methods are forwarded |
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*/ |
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protected void setRootPaneCheckingEnabled(boolean enabled) { |
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rootPaneCheckingEnabled = enabled; |
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} |
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293 |
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/** |
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* Adds the specified child <code>Component</code>. |
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296 |
* This method is overridden to conditionally forward calls to the |
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297 |
* <code>contentPane</code>. |
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* By default, children are added to the <code>contentPane</code> instead |
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* of the frame, refer to {@link javax.swing.RootPaneContainer} for |
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* details. |
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* |
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302 |
* @param comp the component to be enhanced |
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* @param constraints the constraints to be respected |
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* @param index the index |
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* @exception IllegalArgumentException if <code>index</code> is invalid |
|
306 |
* @exception IllegalArgumentException if adding the container's parent |
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* to itself |
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308 |
* @exception IllegalArgumentException if adding a window to a container |
|
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* |
|
310 |
* @see #setRootPaneCheckingEnabled |
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* @see javax.swing.RootPaneContainer |
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*/ |
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protected void addImpl(Component comp, Object constraints, int index) |
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{ |
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315 |
if(isRootPaneCheckingEnabled()) { |
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getContentPane().add(comp, constraints, index); |
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} |
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else { |
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super.addImpl(comp, constraints, index); |
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320 |
} |
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321 |
} |
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322 |
||
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/** |
|
324 |
* Removes the specified component from the container. If |
|
325 |
* <code>comp</code> is not the <code>rootPane</code>, this will forward |
|
326 |
* the call to the <code>contentPane</code>. This will do nothing if |
|
327 |
* <code>comp</code> is not a child of the <code>JFrame</code> or |
|
328 |
* <code>contentPane</code>. |
|
329 |
* |
|
330 |
* @param comp the component to be removed |
|
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* @throws NullPointerException if <code>comp</code> is null |
|
332 |
* @see #add |
|
333 |
* @see javax.swing.RootPaneContainer |
|
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*/ |
|
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public void remove(Component comp) { |
|
336 |
if (comp == rootPane) { |
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super.remove(comp); |
|
338 |
} else { |
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getContentPane().remove(comp); |
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340 |
} |
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} |
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342 |
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343 |
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344 |
/** |
|
345 |
* Sets the <code>LayoutManager</code>. |
|
346 |
* Overridden to conditionally forward the call to the |
|
347 |
* <code>contentPane</code>. |
|
348 |
* Refer to {@link javax.swing.RootPaneContainer} for |
|
349 |
* more information. |
|
350 |
* |
|
351 |
* @param manager the <code>LayoutManager</code> |
|
352 |
* @see #setRootPaneCheckingEnabled |
|
353 |
* @see javax.swing.RootPaneContainer |
|
354 |
*/ |
|
355 |
public void setLayout(LayoutManager manager) { |
|
356 |
if(isRootPaneCheckingEnabled()) { |
|
357 |
getContentPane().setLayout(manager); |
|
358 |
} |
|
359 |
else { |
|
360 |
super.setLayout(manager); |
|
361 |
} |
|
362 |
} |
|
363 |
||
364 |
||
365 |
/** |
|
366 |
* Returns the rootPane object for this applet. |
|
367 |
* |
|
368 |
* @see #setRootPane |
|
369 |
* @see RootPaneContainer#getRootPane |
|
370 |
*/ |
|
371 |
public JRootPane getRootPane() { |
|
372 |
return rootPane; |
|
373 |
} |
|
374 |
||
375 |
||
376 |
/** |
|
377 |
* Sets the rootPane property. This method is called by the constructor. |
|
378 |
* @param root the rootPane object for this applet |
|
379 |
* |
|
380 |
* @see #getRootPane |
|
381 |
* |
|
382 |
* @beaninfo |
|
383 |
* hidden: true |
|
384 |
* description: the RootPane object for this applet. |
|
385 |
*/ |
|
386 |
protected void setRootPane(JRootPane root) { |
|
387 |
if(rootPane != null) { |
|
388 |
remove(rootPane); |
|
389 |
} |
|
390 |
rootPane = root; |
|
391 |
if(rootPane != null) { |
|
392 |
boolean checkingEnabled = isRootPaneCheckingEnabled(); |
|
393 |
try { |
|
394 |
setRootPaneCheckingEnabled(false); |
|
395 |
add(rootPane, BorderLayout.CENTER); |
|
396 |
} |
|
397 |
finally { |
|
398 |
setRootPaneCheckingEnabled(checkingEnabled); |
|
399 |
} |
|
400 |
} |
|
401 |
} |
|
402 |
||
403 |
||
404 |
/** |
|
405 |
* Returns the contentPane object for this applet. |
|
406 |
* |
|
407 |
* @see #setContentPane |
|
408 |
* @see RootPaneContainer#getContentPane |
|
409 |
*/ |
|
410 |
public Container getContentPane() { |
|
411 |
return getRootPane().getContentPane(); |
|
412 |
} |
|
413 |
||
414 |
/** |
|
415 |
* Sets the contentPane property. This method is called by the constructor. |
|
416 |
* @param contentPane the contentPane object for this applet |
|
417 |
* |
|
418 |
* @exception java.awt.IllegalComponentStateException (a runtime |
|
419 |
* exception) if the content pane parameter is null |
|
420 |
* @see #getContentPane |
|
421 |
* @see RootPaneContainer#setContentPane |
|
422 |
* |
|
423 |
* @beaninfo |
|
424 |
* hidden: true |
|
425 |
* description: The client area of the applet where child |
|
426 |
* components are normally inserted. |
|
427 |
*/ |
|
428 |
public void setContentPane(Container contentPane) { |
|
429 |
getRootPane().setContentPane(contentPane); |
|
430 |
} |
|
431 |
||
432 |
/** |
|
433 |
* Returns the layeredPane object for this applet. |
|
434 |
* |
|
435 |
* @exception java.awt.IllegalComponentStateException (a runtime |
|
436 |
* exception) if the layered pane parameter is null |
|
437 |
* @see #setLayeredPane |
|
438 |
* @see RootPaneContainer#getLayeredPane |
|
439 |
*/ |
|
440 |
public JLayeredPane getLayeredPane() { |
|
441 |
return getRootPane().getLayeredPane(); |
|
442 |
} |
|
443 |
||
444 |
/** |
|
445 |
* Sets the layeredPane property. This method is called by the constructor. |
|
446 |
* @param layeredPane the layeredPane object for this applet |
|
447 |
* |
|
448 |
* @see #getLayeredPane |
|
449 |
* @see RootPaneContainer#setLayeredPane |
|
450 |
* |
|
451 |
* @beaninfo |
|
452 |
* hidden: true |
|
453 |
* description: The pane which holds the various applet layers. |
|
454 |
*/ |
|
455 |
public void setLayeredPane(JLayeredPane layeredPane) { |
|
456 |
getRootPane().setLayeredPane(layeredPane); |
|
457 |
} |
|
458 |
||
459 |
/** |
|
460 |
* Returns the glassPane object for this applet. |
|
461 |
* |
|
462 |
* @see #setGlassPane |
|
463 |
* @see RootPaneContainer#getGlassPane |
|
464 |
*/ |
|
465 |
public Component getGlassPane() { |
|
466 |
return getRootPane().getGlassPane(); |
|
467 |
} |
|
468 |
||
469 |
/** |
|
470 |
* Sets the glassPane property. |
|
471 |
* This method is called by the constructor. |
|
472 |
* @param glassPane the glassPane object for this applet |
|
473 |
* |
|
474 |
* @see #getGlassPane |
|
475 |
* @see RootPaneContainer#setGlassPane |
|
476 |
* |
|
477 |
* @beaninfo |
|
478 |
* hidden: true |
|
479 |
* description: A transparent pane used for menu rendering. |
|
480 |
*/ |
|
481 |
public void setGlassPane(Component glassPane) { |
|
482 |
getRootPane().setGlassPane(glassPane); |
|
483 |
} |
|
484 |
||
485 |
/** |
|
486 |
* {@inheritDoc} |
|
487 |
* |
|
488 |
* @since 1.6 |
|
489 |
*/ |
|
490 |
public Graphics getGraphics() { |
|
491 |
JComponent.getGraphicsInvoked(this); |
|
492 |
return super.getGraphics(); |
|
493 |
} |
|
494 |
||
495 |
/** |
|
496 |
* Repaints the specified rectangle of this component within |
|
497 |
* <code>time</code> milliseconds. Refer to <code>RepaintManager</code> |
|
498 |
* for details on how the repaint is handled. |
|
499 |
* |
|
500 |
* @param time maximum time in milliseconds before update |
|
501 |
* @param x the <i>x</i> coordinate |
|
502 |
* @param y the <i>y</i> coordinate |
|
503 |
* @param width the width |
|
504 |
* @param height the height |
|
505 |
* @see RepaintManager |
|
506 |
* @since 1.6 |
|
507 |
*/ |
|
508 |
public void repaint(long time, int x, int y, int width, int height) { |
|
509 |
if (RepaintManager.HANDLE_TOP_LEVEL_PAINT) { |
|
510 |
RepaintManager.currentManager(this).addDirtyRegion( |
|
511 |
this, x, y, width, height); |
|
512 |
} |
|
513 |
else { |
|
514 |
super.repaint(time, x, y, width, height); |
|
515 |
} |
|
516 |
} |
|
517 |
||
518 |
/** |
|
519 |
* Returns a string representation of this JApplet. This method |
|
520 |
* is intended to be used only for debugging purposes, and the |
|
521 |
* content and format of the returned string may vary between |
|
522 |
* implementations. The returned string may be empty but may not |
|
523 |
* be <code>null</code>. |
|
524 |
* |
|
525 |
* @return a string representation of this JApplet. |
|
526 |
*/ |
|
527 |
protected String paramString() { |
|
528 |
String rootPaneString = (rootPane != null ? |
|
529 |
rootPane.toString() : ""); |
|
530 |
String rootPaneCheckingEnabledString = (rootPaneCheckingEnabled ? |
|
531 |
"true" : "false"); |
|
532 |
||
533 |
return super.paramString() + |
|
534 |
",rootPane=" + rootPaneString + |
|
535 |
",rootPaneCheckingEnabled=" + rootPaneCheckingEnabledString; |
|
536 |
} |
|
537 |
||
538 |
||
539 |
||
540 |
///////////////// |
|
541 |
// Accessibility support |
|
542 |
//////////////// |
|
543 |
||
544 |
protected AccessibleContext accessibleContext = null; |
|
545 |
||
546 |
/** |
|
547 |
* Gets the AccessibleContext associated with this JApplet. |
|
548 |
* For JApplets, the AccessibleContext takes the form of an |
|
549 |
* AccessibleJApplet. |
|
550 |
* A new AccessibleJApplet instance is created if necessary. |
|
551 |
* |
|
552 |
* @return an AccessibleJApplet that serves as the |
|
553 |
* AccessibleContext of this JApplet |
|
554 |
*/ |
|
555 |
public AccessibleContext getAccessibleContext() { |
|
556 |
if (accessibleContext == null) { |
|
557 |
accessibleContext = new AccessibleJApplet(); |
|
558 |
} |
|
559 |
return accessibleContext; |
|
560 |
} |
|
561 |
||
562 |
/** |
|
563 |
* This class implements accessibility support for the |
|
564 |
* <code>JApplet</code> class. |
|
565 |
*/ |
|
566 |
protected class AccessibleJApplet extends AccessibleApplet { |
|
567 |
// everything moved to new parent, AccessibleApplet |
|
568 |
} |
|
569 |
} |