https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2020, 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.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.LayoutManager;
import java.awt.event.WindowEvent;

import java.beans.JavaBean;
import java.beans.BeanProperty;

import javax.accessibility.Accessible;
import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleState;
import javax.accessibility.AccessibleStateSet;


An extended version of java.awt.Frame that adds support for
the JFC/Swing component architecture.
You can find task-oriented documentation about using JFrame
in The Java Tutorial, in the section
How to Make Frames.


The JFrame class is slightly incompatible with Frame.
Like all other JFC/Swing top-level containers,
a JFrame contains a JRootPane as its only child.
The content pane provided by the root pane should,
as a rule, contain
all the non-menu components displayed by the JFrame.
This is different from the AWT Frame case. As a convenience, the add, remove, and setLayout methods of this class are overridden, so that they delegate calls to the corresponding methods of the ContentPane. For example, you can add a child component to a frame as follows: 
      frame.add(child);

 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 RootPaneContainer for details on adding, removing and setting the LayoutManager
of a JFrame.


Unlike a Frame, a JFrame 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 setDefaultCloseOperation. To make the JFrame behave the same as a Frame
instance, use
setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE).


For more information on content panes
and other features that root panes provide,
see Using Top-Level Containers in The Java Tutorial.


In a multi-screen environment, you can create a JFrame on a different screen device. See Frame for more information. 

Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.


Warning:
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
has been added to the java.beans package. Please see XMLEncoder. 
Author:Jeff Dinkins, Georges Saab, David Kloba
See Also:
Since:1.2
/**
 * 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="https://docs.oracle.com/javase/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 convenience, the {@code add}, {@code remove}, and {@code setLayout}
 * methods of this class are overridden, so that they delegate calls
 * to the corresponding methods of the {@code ContentPane}.
 * For example, you can add a child component to a frame as follows:
 * <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="https://docs.oracle.com/javase/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
 * 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
 *
 * @author Jeff Dinkins
 * @author Georges Saab
 * @author David Kloba
 * @since 1.2
 */
@JavaBean(defaultProperty = "JMenuBar", description = "A toplevel window which can be minimized to an icon.")
@SwingContainer(delegate = "getContentPane")
@SuppressWarnings("serial") // Same-version serialization only
public class JFrame  extends Frame implements WindowConstants,
                                              Accessible,
                                              RootPaneContainer,
                              TransferHandler.HasGetTransferHandler
{
    
Key into the AppContext, used to check if should provide decorations
by default.

/**
     * 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 TransferHandler for this frame.

/**
     * The <code>TransferHandler</code> for this frame.
     */
    private TransferHandler transferHandler;

    
The JRootPane instance that manages the
contentPane
and optional menuBar for this frame, as well as the
glassPane.

See Also:
/**
     * 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 add and setLayout
will be forwarded to the contentPane. This is initially
false, but is set to true when the JFrame is constructed.

See Also:
/**
     * 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.


This constructor sets the component's locale property to the value
returned by JComponent.getDefaultLocale.

Throws:
  • HeadlessException – if GraphicsEnvironment.isHeadless()
returns true.
See Also:
/**
     * 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 Frame in the specified
GraphicsConfiguration of
a screen device and a blank title.


This constructor sets the component's locale property to the value
returned by JComponent.getDefaultLocale.

Params:
  • gc – the GraphicsConfiguration that is used
         to construct the new Frame;
         if gc is null, the system
         default GraphicsConfiguration is assumed
Throws:
  • IllegalArgumentException – if gc is not from
         a screen device.  This exception is always thrown when
     GraphicsEnvironment.isHeadless() returns true.
See Also:
Since:    1.3
/**
     * 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 Frame with the
specified title.


This constructor sets the component's locale property to the value
returned by JComponent.getDefaultLocale.

Params:
  • title – the title for the frame
Throws:
See Also:
/**
     * 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 JFrame with the specified title and the
specified GraphicsConfiguration of a screen device.


This constructor sets the component's locale property to the value
returned by JComponent.getDefaultLocale.

Params:
  • title – the title to be displayed in the
         frame's border. A null value is treated as
         an empty string, "".
  • gc – the GraphicsConfiguration that is used
         to construct the new JFrame with;
         if gc is null, the system
         default GraphicsConfiguration is assumed
Throws:
  • IllegalArgumentException – if gc is not from
         a screen device.  This exception is always thrown when
     GraphicsEnvironment.isHeadless() returns true.
See Also:
Since:    1.3
/**
     * 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 JFrame properly. 
/** 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);
    }

    
Called by the constructor methods to create the default
rootPane.

Returns:a new JRootPane
/**
     * Called by the constructor methods to create the default
     * <code>rootPane</code>.
     *
     * @return a new {@code JRootPane}
     */
    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 defaultCloseOperation property.

Params:
  • e –  the window event
See Also:
/**
     * 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(final 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 EXIT_ON_CLOSE:
                    // This needs to match the checkExit call in
                    // setDefaultCloseOperation
                    System.exit(0);
                    break;
                case DO_NOTHING_ON_CLOSE:
                default:
            }
        }
    }

    
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:




    

  • DO_NOTHING_ON_CLOSE
(defined in WindowConstants):
Don't do anything; require the
program to handle the operation in the windowClosing
method of a registered WindowListener object.

  • HIDE_ON_CLOSE
(defined in WindowConstants):
Automatically hide the frame after
invoking any registered WindowListener
objects.

  • DISPOSE_ON_CLOSE
(defined in WindowConstants):
Automatically hide and dispose the
frame after invoking any registered WindowListener
objects.

  • EXIT_ON_CLOSE
(defined in WindowConstants):
Exit the application using the System
exit method.  Use this only in applications.




The value is set to HIDE_ON_CLOSE by default. Changes
to the value of this property cause the firing of a property
change event, with property name "defaultCloseOperation".


Note: When the last displayable window within the
Java virtual machine (VM) is disposed of, the VM may
terminate.  See 
AWT Threading Issues for more information.

Params:
  • operation – the operation which should be performed when the
       user closes the frame
Throws:
  • IllegalArgumentException – if defaultCloseOperation value
            isn't one of the above valid values
  • SecurityException – 
       if EXIT_ON_CLOSE has been specified and the
       SecurityManager will
       not allow the caller to invoke System.exit
See Also:
/**
     * 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:
     * <br><br>
     * <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>WindowConstants</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)
     */
    @BeanProperty(preferred = true, enumerationValues = {
            "WindowConstants.DO_NOTHING_ON_CLOSE",
            "WindowConstants.HIDE_ON_CLOSE",
            "WindowConstants.DISPOSE_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 (operation == EXIT_ON_CLOSE) {
            SecurityManager security = System.getSecurityManager();
            if (security != null) {
                security.checkExit(0);
            }
        }
        if (this.defaultCloseOperation != operation) {
            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.

See Also:
Returns:an integer indicating the window-close 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 transferHandler property, which is a mechanism to support transfer of data into this component. Use null if the component does not support data transfer operations. 
 If the system property suppressSwingDropSupport is false (the default) and the current drop target on this component is either null or not a user-set drop target, this method will change the drop target as follows: If newHandler is null it will clear the drop target. If not null it will install a new DropTarget. 
 Note: When used with JFrame, TransferHandler only provides data import capability, as the data export related methods are currently typed to JComponent. 

Please see

How to Use Drag and Drop and Data Transfer, a section in
The Java Tutorial, for more information.

Params:
  • newHandler – the new TransferHandler
See Also:
Since:1.6
/**
     * 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="https://docs.oracle.com/javase/tutorial/uiswing/dnd/index.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
     */
    @BeanProperty(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 transferHandler property.

See Also:
Returns:the value of the transferHandler property
Since:1.6
/**
     * 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 paint(g).  This method was overridden to
prevent an unnecessary call to clear the background.

Params:
  • g – the Graphics context in which to paint
/**
     * 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.

Params:
  • menubar – the menubar being placed in the frame
See Also:
/**
    * Sets the menubar for this frame.
    * @param menubar the menubar being placed in the frame
    *
    * @see #getJMenuBar
    */
    @BeanProperty(bound = false, hidden = true, description
            = "The menubar for accessing pulldown menus from this frame.")
    public void setJMenuBar(final JMenuBar menubar) {
        getRootPane().setJMenuBar(menubar);
    }

   
Returns the menubar set on this frame.

See Also:
Returns:the menubar for this frame
/**
    * Returns the menubar set on this frame.
    * @return the menubar for this frame
    *
    * @see #setJMenuBar
    */
    public JMenuBar getJMenuBar() {
        return getRootPane().getJMenuBar();
    }

    
Returns whether calls to add and
setLayout are forwarded to the contentPane.

See Also:
Returns:true if add and setLayout
        are forwarded; false otherwise
/**
     * Returns whether calls to <code>add</code> and
     * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
     *
     * @return true if <code>add</code> and <code>setLayout</code>
     *         are forwarded; false otherwise
     *
     * @see #addImpl
     * @see #setLayout
     * @see #setRootPaneCheckingEnabled
     * @see javax.swing.RootPaneContainer
     */
    protected boolean isRootPaneCheckingEnabled() {
        return rootPaneCheckingEnabled;
    }


    
Sets whether calls to add and
setLayout are forwarded to the contentPane.

Params:
  • enabled –  true if add and setLayout
       are forwarded, false if they should operate directly on the
       JFrame.
See Also:
/**
     * Sets whether calls to <code>add</code> and
     * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
     *
     * @param enabled  true if <code>add</code> and <code>setLayout</code>
     *        are forwarded, false if they should operate directly on the
     *        <code>JFrame</code>.
     *
     * @see #addImpl
     * @see #setLayout
     * @see #isRootPaneCheckingEnabled
     * @see javax.swing.RootPaneContainer
     */
    @BeanProperty(hidden = true, description
            = "Whether the add and setLayout methods are forwarded")
    protected void setRootPaneCheckingEnabled(boolean enabled) {
        rootPaneCheckingEnabled = enabled;
    }


    
Adds the specified child Component.
This method is overridden to conditionally forward calls to the
contentPane.
By default, children are added to the contentPane instead of the frame, refer to RootPaneContainer for details. 
Params:
  • comp – the component to be enhanced
  • constraints – the constraints to be respected
  • index – the index
Throws:
See Also:
/**
     * Adds the specified child <code>Component</code>.
     * This method is overridden to conditionally forward calls to the
     * <code>contentPane</code>.
     * By default, children are added to the <code>contentPane</code> instead
     * of the frame, refer to {@link javax.swing.RootPaneContainer} for
     * details.
     *
     * @param comp the component to be enhanced
     * @param constraints the constraints to be respected
     * @param index the index
     * @exception IllegalArgumentException if <code>index</code> is invalid
     * @exception IllegalArgumentException if adding the container's parent
     *                  to itself
     * @exception IllegalArgumentException if adding a window to a container
     *
     * @see #setRootPaneCheckingEnabled
     * @see javax.swing.RootPaneContainer
     */
    protected void addImpl(Component comp, Object constraints, int index)
    {
        if(isRootPaneCheckingEnabled()) {
            getContentPane().add(comp, constraints, index);
        }
        else {
            super.addImpl(comp, constraints, index);
        }
    }

    
Removes the specified component from the container. If
comp is not the rootPane, this will forward
the call to the contentPane. This will do nothing if
comp is not a child of the JFrame or
contentPane.

Params:
  • comp – the component to be removed
Throws:
See Also:
/**
     * Removes the specified component from the container. If
     * <code>comp</code> is not the <code>rootPane</code>, this will forward
     * the call to the <code>contentPane</code>. This will do nothing if
     * <code>comp</code> is not a child of the <code>JFrame</code> or
     * <code>contentPane</code>.
     *
     * @param comp the component to be removed
     * @throws NullPointerException if <code>comp</code> is null
     * @see #add
     * @see javax.swing.RootPaneContainer
     */
    public void remove(Component comp) {
        if (comp == rootPane) {
            super.remove(comp);
        } else {
            getContentPane().remove(comp);
        }
    }


    
Sets the LayoutManager.
Overridden to conditionally forward the call to the
contentPane. Refer to RootPaneContainer for more information. 
Params:
  • manager – the LayoutManager
See Also:
/**
     * Sets the <code>LayoutManager</code>.
     * Overridden to conditionally forward the call to the
     * <code>contentPane</code>.
     * Refer to {@link javax.swing.RootPaneContainer} for
     * more information.
     *
     * @param manager the <code>LayoutManager</code>
     * @see #setRootPaneCheckingEnabled
     * @see javax.swing.RootPaneContainer
     */
    public void setLayout(LayoutManager manager) {
        if(isRootPaneCheckingEnabled()) {
            getContentPane().setLayout(manager);
        }
        else {
            super.setLayout(manager);
        }
    }


    
Returns the rootPane object for this frame.

See Also:
Returns:the rootPane property
/**
     * Returns the <code>rootPane</code> object for this frame.
     * @return the <code>rootPane</code> property
     *
     * @see #setRootPane
     * @see RootPaneContainer#getRootPane
     */
    @BeanProperty(bound = false, hidden = true, description
            = "the RootPane object for this frame.")
    public JRootPane getRootPane() {
        return rootPane;
    }


    
Sets the rootPane property.
This method is called by the constructor.

Params:
  • root – the rootPane object for this frame
See Also:
/**
     * Sets the <code>rootPane</code> property.
     * This method is called by the constructor.
     * @param root the <code>rootPane</code> object for this frame
     *
     * @see #getRootPane
     */
    protected void setRootPane(JRootPane root)
    {
        if(rootPane != null) {
            remove(rootPane);
        }
        rootPane = root;
        if(rootPane != null) {
            boolean checkingEnabled = isRootPaneCheckingEnabled();
            try {
                setRootPaneCheckingEnabled(false);
                add(rootPane, BorderLayout.CENTER);
            }
            finally {
                setRootPaneCheckingEnabled(checkingEnabled);
            }
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    public void setIconImage(Image image) {
        super.setIconImage(image);
    }

    
Returns the contentPane object for this frame.

See Also:
Returns:the contentPane property
/**
     * Returns the <code>contentPane</code> object for this frame.
     * @return the <code>contentPane</code> property
     *
     * @see #setContentPane
     * @see RootPaneContainer#getContentPane
     */
    public Container getContentPane() {
        return getRootPane().getContentPane();
    }

    
Sets the contentPane property.
This method is called by the constructor.


Swing's painting architecture requires an opaque JComponent
in the containment hierarchy. This is typically provided by the
content pane. If you replace the content pane it is recommended you
replace it with an opaque JComponent.

Params:
  • contentPane – the contentPane object for this frame
Throws:
See Also:
/**
     * Sets the <code>contentPane</code> property.
     * This method is called by the constructor.
     * <p>
     * Swing's painting architecture requires an opaque <code>JComponent</code>
     * in the containment hierarchy. This is typically provided by the
     * content pane. If you replace the content pane it is recommended you
     * replace it with an opaque <code>JComponent</code>.
     *
     * @param contentPane the <code>contentPane</code> object for this frame
     *
     * @exception java.awt.IllegalComponentStateException (a runtime
     *            exception) if the content pane parameter is <code>null</code>
     * @see #getContentPane
     * @see RootPaneContainer#setContentPane
     * @see JRootPane
     */
    @BeanProperty(bound = false, hidden = true, description
            = "The client area of the frame where child components are normally inserted.")
    public void setContentPane(Container contentPane) {
        getRootPane().setContentPane(contentPane);
    }

    
Returns the layeredPane object for this frame.

See Also:
Returns:the layeredPane property
/**
     * Returns the <code>layeredPane</code> object for this frame.
     * @return the <code>layeredPane</code> property
     *
     * @see #setLayeredPane
     * @see RootPaneContainer#getLayeredPane
     */
    public JLayeredPane getLayeredPane() {
        return getRootPane().getLayeredPane();
    }

    
Sets the layeredPane property.
This method is called by the constructor.

Params:
  • layeredPane – the layeredPane object for this frame
Throws:
See Also:
/**
     * Sets the <code>layeredPane</code> property.
     * This method is called by the constructor.
     * @param layeredPane the <code>layeredPane</code> object for this frame
     *
     * @exception java.awt.IllegalComponentStateException (a runtime
     *            exception) if the layered pane parameter is <code>null</code>
     * @see #getLayeredPane
     * @see RootPaneContainer#setLayeredPane
     */
    @BeanProperty(bound = false, hidden = true, description
            = "The pane that holds the various frame layers.")
    public void setLayeredPane(JLayeredPane layeredPane) {
        getRootPane().setLayeredPane(layeredPane);
    }

    
Returns the glassPane object for this frame.

See Also:
Returns:the glassPane property
/**
     * Returns the <code>glassPane</code> object for this frame.
     * @return the <code>glassPane</code> property
     *
     * @see #setGlassPane
     * @see RootPaneContainer#getGlassPane
     */
    public Component getGlassPane() {
        return getRootPane().getGlassPane();
    }

    
Sets the glassPane property.
This method is called by the constructor.

Params:
  • glassPane – the glassPane object for this frame
See Also:
/**
     * Sets the <code>glassPane</code> property.
     * This method is called by the constructor.
     * @param glassPane the <code>glassPane</code> object for this frame
     *
     * @see #getGlassPane
     * @see RootPaneContainer#setGlassPane
     */
    @BeanProperty(bound = false, hidden = true, description
            = "A transparent pane used for menu rendering.")
    public void setGlassPane(Component glassPane) {
        getRootPane().setGlassPane(glassPane);
    }

    
{@inheritDoc}

Since:1.6
/**
     * {@inheritDoc}
     *
     * @since 1.6
     */
    @BeanProperty(bound = false)
    public Graphics getGraphics() {
        JComponent.getGraphicsInvoked(this);
        return super.getGraphics();
    }

    
Repaints the specified rectangle of this component within
time milliseconds.  Refer to RepaintManager
for details on how the repaint is handled.

Params:
  • time –   maximum time in milliseconds before update
  • x –    the x coordinate
  • y –    the y coordinate
  • width –    the width
  • height –   the height
See Also:
Since:    1.6
/**
     * Repaints the specified rectangle of this component within
     * <code>time</code> milliseconds.  Refer to <code>RepaintManager</code>
     * for details on how the repaint is handled.
     *
     * @param     time   maximum time in milliseconds before update
     * @param     x    the <i>x</i> coordinate
     * @param     y    the <i>y</i> coordinate
     * @param     width    the width
     * @param     height   the height
     * @see       RepaintManager
     * @since     1.6
     */
    public void repaint(long time, int x, int y, int width, int height) {
        if (RepaintManager.HANDLE_TOP_LEVEL_PAINT) {
            RepaintManager.currentManager(this).addDirtyRegion(
                              this, x, y, width, height);
        }
        else {
            super.repaint(time, x, y, width, height);
        }
    }

    
Provides a hint as to whether or not newly created JFrames
should have their Window decorations (such as borders, widgets to
close the window, title...) provided by the current look
and feel. If defaultLookAndFeelDecorated is true,
the current LookAndFeel supports providing window
decorations, and the current window manager supports undecorated
windows, then newly created JFrames will have their
Window decorations provided by the current LookAndFeel.
Otherwise, newly created JFrames will have their
Window decorations provided by the current window manager.


You can get the same effect on a single JFrame by doing the following:

   JFrame frame = new JFrame();
   frame.setUndecorated(true);
   frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);



Params:
  • defaultLookAndFeelDecorated – A hint as to whether or not current
       look and feel should provide window decorations
See Also:
Since:1.4
/**
     * Provides a hint as to whether or not newly created <code>JFrame</code>s
     * should have their Window decorations (such as borders, widgets to
     * close the window, title...) provided by the current look
     * and feel. If <code>defaultLookAndFeelDecorated</code> is true,
     * the current <code>LookAndFeel</code> supports providing window
     * decorations, and the current window manager supports undecorated
     * windows, then newly created <code>JFrame</code>s will have their
     * Window decorations provided by the current <code>LookAndFeel</code>.
     * Otherwise, newly created <code>JFrame</code>s will have their
     * Window decorations provided by the current window manager.
     * <p>
     * You can get the same effect on a single JFrame by doing the following:
     * <pre>
     *    JFrame frame = new JFrame();
     *    frame.setUndecorated(true);
     *    frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
     * </pre>
     *
     * @param defaultLookAndFeelDecorated A hint as to whether or not current
     *        look and feel should provide window decorations
     * @see javax.swing.LookAndFeel#getSupportsWindowDecorations
     * @since 1.4
     */
    public static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated) {
        if (defaultLookAndFeelDecorated) {
            SwingUtilities.appContextPut(defaultLookAndFeelDecoratedKey, Boolean.TRUE);
        } else {
            SwingUtilities.appContextPut(defaultLookAndFeelDecoratedKey, Boolean.FALSE);
        }
    }


    
Returns true if newly created JFrames should have their
Window decorations provided by the current look and feel. This is only
a hint, as certain look and feels may not support this feature.

Returns:true if look and feel should provide Window decorations.
Since:1.4
/**
     * Returns true if newly created <code>JFrame</code>s should have their
     * Window decorations provided by the current look and feel. This is only
     * a hint, as certain look and feels may not support this feature.
     *
     * @return true if look and feel should provide Window decorations.
     * @since 1.4
     */
    public static boolean isDefaultLookAndFeelDecorated() {
        Boolean defaultLookAndFeelDecorated =
            (Boolean) SwingUtilities.appContextGet(defaultLookAndFeelDecoratedKey);
        if (defaultLookAndFeelDecorated == null) {
            defaultLookAndFeelDecorated = Boolean.FALSE;
        }
        return defaultLookAndFeelDecorated.booleanValue();
    }

    
Returns a string representation of this JFrame.
This method
is intended to be used only for debugging purposes, and the
content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.

Returns: a string representation of this JFrame
/**
     * Returns a string representation of this <code>JFrame</code>.
     * This method
     * is intended to be used only for debugging purposes, and the
     * content and format of the returned string may vary between
     * implementations. The returned string may be empty but may not
     * be <code>null</code>.
     *
     * @return  a string representation of this <code>JFrame</code>
     */
    protected String paramString() {
        String defaultCloseOperationString;
        if (defaultCloseOperation == HIDE_ON_CLOSE) {
            defaultCloseOperationString = "HIDE_ON_CLOSE";
        } else if (defaultCloseOperation == DISPOSE_ON_CLOSE) {
            defaultCloseOperationString = "DISPOSE_ON_CLOSE";
        } else if (defaultCloseOperation == DO_NOTHING_ON_CLOSE) {
            defaultCloseOperationString = "DO_NOTHING_ON_CLOSE";
        } else if (defaultCloseOperation == EXIT_ON_CLOSE) {
            defaultCloseOperationString = "EXIT_ON_CLOSE";
        } else defaultCloseOperationString = "";
        String rootPaneString = (rootPane != null ?
                                 rootPane.toString() : "");
        String rootPaneCheckingEnabledString = (rootPaneCheckingEnabled ?
                                                "true" : "false");

        return super.paramString() +
        ",defaultCloseOperation=" + defaultCloseOperationString +
        ",rootPane=" + rootPaneString +
        ",rootPaneCheckingEnabled=" + rootPaneCheckingEnabledString;
    }



/////////////////
// Accessibility support
////////////////

    
The accessible context property.

/**
     * The accessible context property.
     */
    protected AccessibleContext accessibleContext = null;

    
Gets the AccessibleContext associated with this JFrame.
For JFrames, the AccessibleContext takes the form of an
AccessibleJFrame.
A new AccessibleJFrame instance is created if necessary.

Returns:an AccessibleJFrame that serves as the
        AccessibleContext of this JFrame
/**
     * Gets the AccessibleContext associated with this JFrame.
     * For JFrames, the AccessibleContext takes the form of an
     * AccessibleJFrame.
     * A new AccessibleJFrame instance is created if necessary.
     *
     * @return an AccessibleJFrame that serves as the
     *         AccessibleContext of this JFrame
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJFrame();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JFrame class.  It provides an implementation of the
Java Accessibility API appropriate to frame user-interface
elements.

/**
     * This class implements accessibility support for the
     * <code>JFrame</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to frame user-interface
     * elements.
     */
    protected class AccessibleJFrame extends AccessibleAWTFrame {

        
Constructs an AccessibleJFrame. 
/**
         * Constructs an {@code AccessibleJFrame}.
         */
        protected AccessibleJFrame() {}

        // AccessibleContext methods
        
Get the accessible name of this object.

Returns:the localized name of the object -- can be null if this
object does not have a name
/**
         * Get the accessible name of this object.
         *
         * @return the localized name of the object -- can be null if this
         * object does not have a name
         */
        public String getAccessibleName() {
            if (accessibleName != null) {
                return accessibleName;
            } else {
                if (getTitle() == null) {
                    return super.getAccessibleName();
                } else {
                    return getTitle();
                }
            }
        }

        
Get the state of this object.

See Also:
Returns:an instance of AccessibleStateSet containing the current
state set of the object
/**
         * Get the state of this object.
         *
         * @return an instance of AccessibleStateSet containing the current
         * state set of the object
         * @see AccessibleState
         */
        public AccessibleStateSet getAccessibleStateSet() {
            AccessibleStateSet states = super.getAccessibleStateSet();

            if (isResizable()) {
                states.add(AccessibleState.RESIZABLE);
            }
            if (getFocusOwner() != null) {
                states.add(AccessibleState.ACTIVE);
            }
            // FIXME:  [[[WDW - should also return ICONIFIED and ICONIFIABLE
            // if we can ever figure these out]]]
            return states;
        }
    } // inner class AccessibleJFrame
}