/* * Copyright (c) 1997, 2006, 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 javax.swing; import java.awt.*;import java.awt.event.*;import java.beans.PropertyChangeListener;import java.util.Locale;import java.util.Vector;import java.io.Serializable; import javax.accessibility.*;  /** * An extended version of <code>java.awt.Frame</code> that adds support for * the JFC/Swing component architecture. * You can find task-oriented documentation about using <code>JFrame</code> * in <em>The Java Tutorial</em>, in the section * <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/frame.html">How to Make Frames</a>. * * <p> * The <code>JFrame</code> class is slightly incompatible with <code>Frame</code>. * Like all other JFC/Swing top-level containers, * a <code>JFrame</code> contains a <code>JRootPane</code> as its only child. * The <b>content pane</b> provided by the root pane should, * as a rule, contain * all the non-menu components displayed by the <code>JFrame</code>. * This is different from the AWT <code>Frame</code> case. * As a conveniance <code>add</code> and its variants, <code>remove</code> and * <code>setLayout</code> have been overridden to forward to the * <code>contentPane</code> as necessary. This means you can write: * <pre> *       frame.add(child); * </pre> * And the child will be added to the contentPane. * The content pane will * always be non-null. Attempting to set it to null will cause the JFrame * to throw an exception. The default content pane will have a BorderLayout * manager set on it. * Refer to {@link javax.swing.RootPaneContainer} * for details on adding, removing and setting the <code>LayoutManager</code> * of a <code>JFrame</code>. * <p> * Unlike a <code>Frame</code>, a <code>JFrame</code> has some notion of how to * respond when the user attempts to close the window. The default behavior * is to simply hide the JFrame when the user closes the window. To change the * default behavior, you invoke the method * {@link #setDefaultCloseOperation}. * To make the <code>JFrame</code> behave the same as a <code>Frame</code> * instance, use * <code>setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE)</code>. * <p> * For more information on content panes * and other features that root panes provide, * see <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/toplevel.html">Using Top-Level Containers</a> in <em>The Java Tutorial</em>. * <p> * In a multi-screen environment, you can create a <code>JFrame</code> * on a different screen device.  See {@link java.awt.Frame} for more * information. * <p> * <strong>Warning:</strong> Swing is not thread safe. For more * information see <a * href="package-summary.html#threading">Swing's Threading * Policy</a>. * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing.  As of 1.4, support for long term storage * of all JavaBeans<sup><font size="-2">TM</font></sup> * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @see JRootPane * @see #setDefaultCloseOperation * @see java.awt.event.WindowListener#windowClosing * @see javax.swing.RootPaneContainer * * @beaninfo *      attribute: isContainer true *      attribute: containerDelegate getContentPane *    description: A toplevel window which can be minimized to an icon. * * @author Jeff Dinkins * @author Georges Saab * @author David Kloba */public class JFrame  extends Frame implements WindowConstants,                                              Accessible,                                              RootPaneContainer,                              TransferHandler.HasGetTransferHandler{    /**     * The exit application default window close operation. If a window     * has this set as the close operation and is closed in an applet,     * a <code>SecurityException</code> may be thrown.     * It is recommended you only use this in an application.     * <p>     * @since 1.3     */    public static final int EXIT_ON_CLOSE = 3;     /**     * Key into the AppContext, used to check if should provide decorations     * by default.     */    private static final Object defaultLookAndFeelDecoratedKey =            new StringBuffer("JFrame.defaultLookAndFeelDecorated");     private int defaultCloseOperation = HIDE_ON_CLOSE;     /**     * The <code>TransferHandler</code> for this frame.     */    private TransferHandler transferHandler;     /**     * The <code>JRootPane</code> instance that manages the     * <code>contentPane</code>     * and optional <code>menuBar</code> for this frame, as well as the     * <code>glassPane</code>.     *     * @see JRootPane     * @see RootPaneContainer     */    protected JRootPane rootPane;     /**     * If true then calls to <code>add</code> and <code>setLayout</code>     * will be forwarded to the <code>contentPane</code>. This is initially     * false, but is set to true when the <code>JFrame</code> is constructed.     *     * @see #isRootPaneCheckingEnabled     * @see #setRootPaneCheckingEnabled     * @see javax.swing.RootPaneContainer     */    protected boolean rootPaneCheckingEnabled = false;      /**     * Constructs a new frame that is initially invisible.     * <p>     * This constructor sets the component's locale property to the value     * returned by <code>JComponent.getDefaultLocale</code>.     *     * @exception HeadlessException if GraphicsEnvironment.isHeadless()     * returns true.     * @see java.awt.GraphicsEnvironment#isHeadless     * @see Component#setSize     * @see Component#setVisible     * @see JComponent#getDefaultLocale     */    public JFrame() throws HeadlessException {        super();        frameInit();    }     /**     * Creates a <code>Frame</code> in the specified     * <code>GraphicsConfiguration</code> of     * a screen device and a blank title.     * <p>     * This constructor sets the component's locale property to the value     * returned by <code>JComponent.getDefaultLocale</code>.     *     * @param gc the <code>GraphicsConfiguration</code> that is used     *          to construct the new <code>Frame</code>;     *          if <code>gc</code> is <code>null</code>, the system     *          default <code>GraphicsConfiguration</code> is assumed     * @exception IllegalArgumentException if <code>gc</code> is not from     *          a screen device.  This exception is always thrown when     *      GraphicsEnvironment.isHeadless() returns true.     * @see java.awt.GraphicsEnvironment#isHeadless     * @see JComponent#getDefaultLocale     * @since     1.3     */    public JFrame(GraphicsConfiguration gc) {        super(gc);        frameInit();    }     /**     * Creates a new, initially invisible <code>Frame</code> with the     * specified title.     * <p>     * This constructor sets the component's locale property to the value     * returned by <code>JComponent.getDefaultLocale</code>.     *     * @param title the title for the frame     * @exception HeadlessException if GraphicsEnvironment.isHeadless()     * returns true.     * @see java.awt.GraphicsEnvironment#isHeadless     * @see Component#setSize     * @see Component#setVisible     * @see JComponent#getDefaultLocale     */    public JFrame(String title) throws HeadlessException {        super(title);        frameInit();    }     /**     * Creates a <code>JFrame</code> with the specified title and the     * specified <code>GraphicsConfiguration</code> of a screen device.     * <p>     * This constructor sets the component's locale property to the value     * returned by <code>JComponent.getDefaultLocale</code>.     *     * @param title the title to be displayed in the     *          frame's border. A <code>null</code> value is treated as     *          an empty string, "".     * @param gc the <code>GraphicsConfiguration</code> that is used     *          to construct the new <code>JFrame</code> with;     *          if <code>gc</code> is <code>null</code>, the system     *          default <code>GraphicsConfiguration</code> is assumed     * @exception IllegalArgumentException if <code>gc</code> is not from     *          a screen device.  This exception is always thrown when     *      GraphicsEnvironment.isHeadless() returns true.     * @see java.awt.GraphicsEnvironment#isHeadless     * @see JComponent#getDefaultLocale     * @since     1.3     */    public JFrame(String title, GraphicsConfiguration gc) {        super(title, gc);        frameInit();    }     /** Called by the constructors to init the <code>JFrame</code> properly. */    protected void frameInit() {        enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.WINDOW_EVENT_MASK);        setLocale( JComponent.getDefaultLocale() );        setRootPane(createRootPane());        setBackground(UIManager.getColor("control"));        setRootPaneCheckingEnabled(true);        if (JFrame.isDefaultLookAndFeelDecorated()) {            boolean supportsWindowDecorations =            UIManager.getLookAndFeel().getSupportsWindowDecorations();            if (supportsWindowDecorations) {                setUndecorated(true);                getRootPane().setWindowDecorationStyle(JRootPane.FRAME);            }        }        sun.awt.SunToolkit.checkAndSetPolicy(this, true);    }     /**     * Called by the constructor methods to create the default     * <code>rootPane</code>.     */    protected JRootPane createRootPane() {        JRootPane rp = new JRootPane();        // NOTE: this uses setOpaque vs LookAndFeel.installProperty as there        // is NO reason for the RootPane not to be opaque. For painting to        // work the contentPane must be opaque, therefor the RootPane can        // also be opaque.        rp.setOpaque(true);        return rp;    }     /**     * Processes window events occurring on this component.     * Hides the window or disposes of it, as specified by the setting     * of the <code>defaultCloseOperation</code> property.     *     * @param  e  the window event     * @see    #setDefaultCloseOperation     * @see    java.awt.Window#processWindowEvent     */    protected void processWindowEvent(WindowEvent e) {        super.processWindowEvent(e);         if (e.getID() == WindowEvent.WINDOW_CLOSING) {            switch(defaultCloseOperation) {              case HIDE_ON_CLOSE:                 setVisible(false);                 break;              case DISPOSE_ON_CLOSE:                 dispose();                 break;              case DO_NOTHING_ON_CLOSE:                 default:                 break;              case EXIT_ON_CLOSE:                  // This needs to match the checkExit call in                  // setDefaultCloseOperation                System.exit(0);                break;            }        }    } //    public void setMenuBar(MenuBar menu) {//        throw new IllegalComponentStateException("Please use setJMenuBar() with JFrame.");//    }     /**     * Sets the operation that will happen by default when     * the user initiates a "close" on this frame.     * You must specify one of the following choices:     * <p>     * <ul>     * <li><code>DO_NOTHING_ON_CLOSE</code>     * (defined in <code>WindowConstants</code>):     * Don't do anything; require the     * program to handle the operation in the <code>windowClosing</code>     * method of a registered <code>WindowListener</code> object.     *     * <li><code>HIDE_ON_CLOSE</code>     * (defined in <code>WindowConstants</code>):     * Automatically hide the frame after     * invoking any registered <code>WindowListener</code>     * objects.     *     * <li><code>DISPOSE_ON_CLOSE</code>     * (defined in <code>WindowConstants</code>):     * Automatically hide and dispose the     * frame after invoking any registered <code>WindowListener</code>     * objects.     *     * <li><code>EXIT_ON_CLOSE</code>     * (defined in <code>JFrame</code>):     * Exit the application using the <code>System</code>     * <code>exit</code> method.  Use this only in applications.     * </ul>     * <p>     * The value is set to <code>HIDE_ON_CLOSE</code> by default. Changes     * to the value of this property cause the firing of a property     * change event, with property name "defaultCloseOperation".     * <p>     * <b>Note</b>: When the last displayable window within the     * Java virtual machine (VM) is disposed of, the VM may     * terminate.  See <a href="../../java/awt/doc-files/AWTThreadIssues.html">     * AWT Threading Issues</a> for more information.     *     * @param operation the operation which should be performed when the     *        user closes the frame     * @exception IllegalArgumentException if defaultCloseOperation value     *             isn't one of the above valid values     * @see #addWindowListener     * @see #getDefaultCloseOperation     * @see WindowConstants     * @throws  SecurityException     *        if <code>EXIT_ON_CLOSE</code> has been specified and the     *        <code>SecurityManager</code> will     *        not allow the caller to invoke <code>System.exit</code>     * @see        java.lang.Runtime#exit(int)     *     * @beaninfo     *   preferred: true     *       bound: true     *        enum: DO_NOTHING_ON_CLOSE WindowConstants.DO_NOTHING_ON_CLOSE     *              HIDE_ON_CLOSE       WindowConstants.HIDE_ON_CLOSE     *              DISPOSE_ON_CLOSE    WindowConstants.DISPOSE_ON_CLOSE     *              EXIT_ON_CLOSE       WindowConstants.EXIT_ON_CLOSE     * description: The frame's default close operation.     */    public void setDefaultCloseOperation(int operation) {        if (operation != DO_NOTHING_ON_CLOSE &&            operation != HIDE_ON_CLOSE &&            operation != DISPOSE_ON_CLOSE &&            operation != EXIT_ON_CLOSE) {            throw new IllegalArgumentException("defaultCloseOperation must be one of: DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE, DISPOSE_ON_CLOSE, or EXIT_ON_CLOSE");        }        if (this.defaultCloseOperation != operation) {            if (operation == EXIT_ON_CLOSE) {                SecurityManager security = System.getSecurityManager();                if (security != null) {                    security.checkExit(0);                }            }            int oldValue = this.defaultCloseOperation;            this.defaultCloseOperation = operation;            firePropertyChange("defaultCloseOperation", oldValue, operation);        }    }     /**    * Returns the operation that occurs when the user    * initiates a "close" on this frame.    *    * @return an integer indicating the window-close operation    * @see #setDefaultCloseOperation    */    public int getDefaultCloseOperation() {        return defaultCloseOperation;    }     /**     * Sets the {@code transferHandler} property, which is a mechanism to     * support transfer of data into this component. Use {@code null}     * if the component does not support data transfer operations.     * <p>     * If the system property {@code suppressSwingDropSupport} is {@code false}     * (the default) and the current drop target on this component is either     * {@code null} or not a user-set drop target, this method will change the     * drop target as follows: If {@code newHandler} is {@code null} it will     * clear the drop target. If not {@code null} it will install a new     * {@code DropTarget}.     * <p>     * Note: When used with {@code JFrame}, {@code TransferHandler} only     * provides data import capability, as the data export related methods     * are currently typed to {@code JComponent}.     * <p>     * Please see     * <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/dnd.html">     * How to Use Drag and Drop and Data Transfer</a>, a section in     * <em>The Java Tutorial</em>, for more information.     *     * @param newHandler the new {@code TransferHandler}     *     * @see TransferHandler     * @see #getTransferHandler     * @see java.awt.Component#setDropTarget     * @since 1.6     *     * @beaninfo     *        bound: true     *       hidden: true     *  description: Mechanism for transfer of data into the component     */    public void setTransferHandler(TransferHandler newHandler) {        TransferHandler oldHandler = transferHandler;        transferHandler = newHandler;        SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler);        firePropertyChange("transferHandler", oldHandler, newHandler);    }     /**     * Gets the <code>transferHandler</code> property.     *     * @return the value of the <code>transferHandler</code> property     *     * @see TransferHandler     * @see #setTransferHandler     * @since 1.6     */    public TransferHandler getTransferHandler() {        return transferHandler;    }     /**     * Just calls <code>paint(g)</code>.  This method was overridden to     * prevent an unnecessary call to clear the background.     *     * @param g the Graphics context in which to paint     */    public void update(Graphics g) {        paint(g);    }    /**    * Sets the menubar for this frame.    * @param menubar the menubar being placed in the frame    *    * @see #getJMenuBar    *    * @beaninfo    *      hidden: true    * description: The menubar for accessing pulldown menus from this frame.    */    public void setJMenuBar(JMenuBar menubar) {        getRootPane().setMenuBar(menubar);    }    /**    * Returns the menubar set on this frame.    * @return the menubar for this frame    *    * @see #setJMenuBar    */    public JMenuBar getJMenuBar() {        return getRootPane().getMenuBar();    }

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