https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2017, 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.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.security.AccessController;
import javax.accessibility.*;
import javax.swing.plaf.RootPaneUI;
import java.util.Vector;
import java.io.Serializable;
import javax.swing.border.*;

import sun.awt.AWTAccessor;
import sun.security.action.GetBooleanAction;



A lightweight container used behind the scenes by
JFrame, JDialog, JWindow,
JApplet, and JInternalFrame.
For task-oriented information on functionality provided by root panes
see How to Use Root Panes,
a section in The Java Tutorial.


The following image shows the relationships between
the classes that use root panes.


The "heavyweight" components (those that delegate to a peer, or native
component on the host system) are shown with a darker, heavier box. The four
heavyweight JFC/Swing containers (JFrame, JDialog,
JWindow, and JApplet) are
shown in relation to the AWT classes they extend.
These four components are the
only heavyweight containers in the Swing library. The lightweight container
JInternalFrame is also shown.
All five of these JFC/Swing containers implement the
RootPaneContainer interface,
and they all delegate their operations to a
JRootPane (shown with a little "handle" on top).


Note: The JComponent method getRootPane
can be used to obtain the JRootPane that contains
a given component.




Example









The diagram at right shows the structure of a JRootPane.
A JRootpane is made up of a glassPane,
an optional menuBar, and a contentPane.
(The JLayeredPane manages the menuBar
and the contentPane.)
The glassPane sits over the top of everything,
where it is in a position to intercept mouse movements.
Since the glassPane (like the contentPane)
can be an arbitrary component, it is also possible to set up the
glassPane for drawing. Lines and images on the
glassPane can then range
over the frames underneath without being limited by their boundaries.


Although the menuBar component is optional,
the layeredPane, contentPane,
and glassPane always exist.
Attempting to set them to null generates an exception.


To add components to the JRootPane (other than the
optional menu bar), you add the object to the contentPane
of the JRootPane, like this:

      rootPane.getContentPane().add(child);


The same principle holds true for setting layout managers, removing
components, listing children, etc. All these methods are invoked on
the contentPane instead of on the JRootPane.


Note: The default layout manager for the contentPane is
 a BorderLayout manager. However, the JRootPane
 uses a custom LayoutManager.
 So, when you want to change the layout manager for the components you added
 to a JRootPane, be sure to use code like this:

   rootPane.getContentPane().setLayout(new BoxLayout());


If a JMenuBar component is set on the JRootPane,
it is positioned along the upper edge of the frame.
The contentPane is adjusted in location and size to
fill the remaining area.
(The JMenuBar and the contentPane are added to the
layeredPane component at the
JLayeredPane.FRAME_CONTENT_LAYER layer.)


The layeredPane is the parent of all children in the
JRootPane -- both as the direct parent of the menu and
the grandparent of all components added to the contentPane.
It is an instance of JLayeredPane,
which provides the ability to add components at several layers.
This capability is very useful when working with menu popups,
dialog boxes, and dragging -- situations in which you need to place
a component on top of all other components in the pane.


The glassPane sits on top of all other components in the
JRootPane.
That provides a convenient place to draw above all other components,
and makes it possible to intercept mouse events,
which is useful both for dragging and for drawing.
Developers can use setVisible on the glassPane
to control when the glassPane displays over the other children.
By default the glassPane is not visible.


The custom LayoutManager used by JRootPane
ensures that:

    

  1. The glassPane fills the entire viewable
    area of the JRootPane (bounds - insets).

  2. The layeredPane fills the entire viewable area of the
    JRootPane. (bounds - insets)

  3. The menuBar is positioned at the upper edge of the
    layeredPane.

  4. The contentPane fills the entire viewable area,
    minus the menuBar, if present.


Any other views in the JRootPane view hierarchy are ignored.


If you replace the LayoutManager of the JRootPane,
you are responsible for managing all of these views.
So ordinarily you will want to be sure that you
change the layout manager for the contentPane rather than
for the JRootPane itself!


The painting architecture of Swing requires an opaque
JComponent
to exist in the containment hierarchy above all other components. This is
typically provided by way of the content pane. If you replace the content
pane, it is recommended that you make the content pane opaque
by way of setOpaque(true). Additionally, if the content pane
overrides paintComponent, it
will need to completely fill in the background in an opaque color in
paintComponent.


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:David Kloba
See Also:
Since:1.2
/**
 * A lightweight container used behind the scenes by
 * <code>JFrame</code>, <code>JDialog</code>, <code>JWindow</code>,
 * <code>JApplet</code>, and <code>JInternalFrame</code>.
 * For task-oriented information on functionality provided by root panes
 * see <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html">How to Use Root Panes</a>,
 * a section in <em>The Java Tutorial</em>.
 *
 * <p>
 * The following image shows the relationships between
 * the classes that use root panes.
 * <p style="text-align:center"><img src="doc-files/JRootPane-1.gif"
 * alt="The following text describes this graphic."
 * HEIGHT=484 WIDTH=629></p>
 * The &quot;heavyweight&quot; components (those that delegate to a peer, or native
 * component on the host system) are shown with a darker, heavier box. The four
 * heavyweight JFC/Swing containers (<code>JFrame</code>, <code>JDialog</code>,
 * <code>JWindow</code>, and <code>JApplet</code>) are
 * shown in relation to the AWT classes they extend.
 * These four components are the
 * only heavyweight containers in the Swing library. The lightweight container
 * <code>JInternalFrame</code> is also shown.
 * All five of these JFC/Swing containers implement the
 * <code>RootPaneContainer</code> interface,
 * and they all delegate their operations to a
 * <code>JRootPane</code> (shown with a little "handle" on top).
 * <blockquote>
 * <b>Note:</b> The <code>JComponent</code> method <code>getRootPane</code>
 * can be used to obtain the <code>JRootPane</code> that contains
 * a given component.
 * </blockquote>
 *
 * <table class="borderless" style="float:right">
 * <caption>Example</caption>
 * <tr>
 * <td style="text-align:center">
 * <img src="doc-files/JRootPane-2.gif"
 * alt="The following text describes this graphic." HEIGHT=386 WIDTH=349>
 * </td>
 * </tr>
 * </table>
 * The diagram at right shows the structure of a <code>JRootPane</code>.
 * A <code>JRootpane</code> is made up of a <code>glassPane</code>,
 * an optional <code>menuBar</code>, and a <code>contentPane</code>.
 * (The <code>JLayeredPane</code> manages the <code>menuBar</code>
 * and the <code>contentPane</code>.)
 * The <code>glassPane</code> sits over the top of everything,
 * where it is in a position to intercept mouse movements.
 * Since the <code>glassPane</code> (like the <code>contentPane</code>)
 * can be an arbitrary component, it is also possible to set up the
 * <code>glassPane</code> for drawing. Lines and images on the
 * <code>glassPane</code> can then range
 * over the frames underneath without being limited by their boundaries.
 * <p>
 * Although the <code>menuBar</code> component is optional,
 * the <code>layeredPane</code>, <code>contentPane</code>,
 * and <code>glassPane</code> always exist.
 * Attempting to set them to <code>null</code> generates an exception.
 * <p>
 * To add components to the <code>JRootPane</code> (other than the
 * optional menu bar), you add the object to the <code>contentPane</code>
 * of the <code>JRootPane</code>, like this:
 * <pre>
 *       rootPane.getContentPane().add(child);
 * </pre>
 * The same principle holds true for setting layout managers, removing
 * components, listing children, etc. All these methods are invoked on
 * the <code>contentPane</code> instead of on the <code>JRootPane</code>.
 * <blockquote>
 * <b>Note:</b> The default layout manager for the <code>contentPane</code> is
 *  a <code>BorderLayout</code> manager. However, the <code>JRootPane</code>
 *  uses a custom <code>LayoutManager</code>.
 *  So, when you want to change the layout manager for the components you added
 *  to a <code>JRootPane</code>, be sure to use code like this:
 * <pre>
 *    rootPane.getContentPane().setLayout(new BoxLayout());
 * </pre></blockquote>
 * If a <code>JMenuBar</code> component is set on the <code>JRootPane</code>,
 * it is positioned along the upper edge of the frame.
 * The <code>contentPane</code> is adjusted in location and size to
 * fill the remaining area.
 * (The <code>JMenuBar</code> and the <code>contentPane</code> are added to the
 * <code>layeredPane</code> component at the
 * <code>JLayeredPane.FRAME_CONTENT_LAYER</code> layer.)
 * <p>
 * The <code>layeredPane</code> is the parent of all children in the
 * <code>JRootPane</code> -- both as the direct parent of the menu and
 * the grandparent of all components added to the <code>contentPane</code>.
 * It is an instance of <code>JLayeredPane</code>,
 * which provides the ability to add components at several layers.
 * This capability is very useful when working with menu popups,
 * dialog boxes, and dragging -- situations in which you need to place
 * a component on top of all other components in the pane.
 * <p>
 * The <code>glassPane</code> sits on top of all other components in the
 * <code>JRootPane</code>.
 * That provides a convenient place to draw above all other components,
 * and makes it possible to intercept mouse events,
 * which is useful both for dragging and for drawing.
 * Developers can use <code>setVisible</code> on the <code>glassPane</code>
 * to control when the <code>glassPane</code> displays over the other children.
 * By default the <code>glassPane</code> is not visible.
 * <p>
 * The custom <code>LayoutManager</code> used by <code>JRootPane</code>
 * ensures that:
 * <OL>
 * <LI>The <code>glassPane</code> fills the entire viewable
 *     area of the <code>JRootPane</code> (bounds - insets).
 * <LI>The <code>layeredPane</code> fills the entire viewable area of the
 *     <code>JRootPane</code>. (bounds - insets)
 * <LI>The <code>menuBar</code> is positioned at the upper edge of the
 *     <code>layeredPane</code>.
 * <LI>The <code>contentPane</code> fills the entire viewable area,
 *     minus the <code>menuBar</code>, if present.
 * </OL>
 * Any other views in the <code>JRootPane</code> view hierarchy are ignored.
 * <p>
 * If you replace the <code>LayoutManager</code> of the <code>JRootPane</code>,
 * you are responsible for managing all of these views.
 * So ordinarily you will want to be sure that you
 * change the layout manager for the <code>contentPane</code> rather than
 * for the <code>JRootPane</code> itself!
 * <p>
 * The painting architecture of Swing requires an opaque
 * <code>JComponent</code>
 * to exist in the containment hierarchy above all other components. This is
 * typically provided by way of the content pane. If you replace the content
 * pane, it is recommended that you make the content pane opaque
 * by way of <code>setOpaque(true)</code>. Additionally, if the content pane
 * overrides <code>paintComponent</code>, it
 * will need to completely fill in the background in an opaque color in
 * <code>paintComponent</code>.
 * <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&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @see JLayeredPane
 * @see JMenuBar
 * @see JWindow
 * @see JFrame
 * @see JDialog
 * @see JApplet
 * @see JInternalFrame
 * @see JComponent
 * @see BoxLayout
 *
 * @see <a href="http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html">
 * Mixing Heavy and Light Components</a>
 *
 * @author David Kloba
 * @since 1.2
 */
/// PENDING(klobad) Who should be opaque in this component?
@SuppressWarnings("serial")
public class JRootPane extends JComponent implements Accessible {

    private static final String uiClassID = "RootPaneUI";

    
Whether or not we should dump the stack when true double buffering
is disabled. Default is false.

/**
     * Whether or not we should dump the stack when true double buffering
     * is disabled. Default is false.
     */
    private static final boolean LOG_DISABLE_TRUE_DOUBLE_BUFFERING;

    
Whether or not we should ignore requests to disable true double
buffering. Default is false.

/**
     * Whether or not we should ignore requests to disable true double
     * buffering. Default is false.
     */
    private static final boolean IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should not provide any sort of
Window decorations.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should not provide any sort of
     * Window decorations.
     *
     * @since 1.4
     */
    public static final int NONE = 0;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Frame.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Frame.
     *
     * @since 1.4
     */
    public static final int FRAME = 1;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog.
     *
     * @since 1.4
     */
    public static final int PLAIN_DIALOG = 2;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to display an informational message.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to display an informational message.
     *
     * @since 1.4
     */
    public static final int INFORMATION_DIALOG = 3;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to display an error message.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to display an error message.
     *
     * @since 1.4
     */
    public static final int ERROR_DIALOG = 4;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to display a JColorChooser.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to display a <code>JColorChooser</code>.
     *
     * @since 1.4
     */
    public static final int COLOR_CHOOSER_DIALOG = 5;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to display a JFileChooser.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to display a <code>JFileChooser</code>.
     *
     * @since 1.4
     */
    public static final int FILE_CHOOSER_DIALOG = 6;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to present a question to the user.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to present a question to the user.
     *
     * @since 1.4
     */
    public static final int QUESTION_DIALOG = 7;

    
Constant used for the windowDecorationStyle property. Indicates that
the JRootPane should provide decorations appropriate for
a Dialog used to display a warning message.

Since:1.4
/**
     * Constant used for the windowDecorationStyle property. Indicates that
     * the <code>JRootPane</code> should provide decorations appropriate for
     * a Dialog used to display a warning message.
     *
     * @since 1.4
     */
    public static final int WARNING_DIALOG = 8;

    private int windowDecorationStyle;

    
The menu bar. 
/** The menu bar. */
    protected JMenuBar menuBar;

    
The content pane. 
/** The content pane. */
    protected Container contentPane;

    
The layered pane that manages the menu bar and content pane. 
/** The layered pane that manages the menu bar and content pane. */
    protected JLayeredPane layeredPane;

    
The glass pane that overlays the menu bar and content pane,
 so it can intercept mouse movements and such.

/**
     * The glass pane that overlays the menu bar and content pane,
     *  so it can intercept mouse movements and such.
     */
    protected Component glassPane;
    
The button that gets activated when the pane has the focus and
a UI-specific action like pressing the Enter key occurs.

/**
     * The button that gets activated when the pane has the focus and
     * a UI-specific action like pressing the <b>Enter</b> key occurs.
     */
    protected JButton defaultButton;

    
Whether or not true double buffering should be used.  This is typically
true, but may be set to false in special situations.  For example,
heavy weight popups (backed by a window) set this to false.

/**
     * Whether or not true double buffering should be used.  This is typically
     * true, but may be set to false in special situations.  For example,
     * heavy weight popups (backed by a window) set this to false.
     */
    boolean useTrueDoubleBuffering = true;

    static {
        LOG_DISABLE_TRUE_DOUBLE_BUFFERING =
            AccessController.doPrivileged(new GetBooleanAction(
                                   "swing.logDoubleBufferingDisable"));
        IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING =
            AccessController.doPrivileged(new GetBooleanAction(
                                   "swing.ignoreDoubleBufferingDisable"));
    }

    
Creates a JRootPane, setting up its
glassPane, layeredPane,
and contentPane.

/**
     * Creates a <code>JRootPane</code>, setting up its
     * <code>glassPane</code>, <code>layeredPane</code>,
     * and <code>contentPane</code>.
     */
    public JRootPane() {
        setGlassPane(createGlassPane());
        setLayeredPane(createLayeredPane());
        setContentPane(createContentPane());
        setLayout(createRootLayout());
        setDoubleBuffered(true);
        updateUI();
    }

    
{@inheritDoc}

Since:1.6
/**
     * {@inheritDoc}
     * @since 1.6
     */
    public void setDoubleBuffered(boolean aFlag) {
        if (isDoubleBuffered() != aFlag) {
            super.setDoubleBuffered(aFlag);
            RepaintManager.currentManager(this).doubleBufferingChanged(this);
        }
    }

    
Returns a constant identifying the type of Window decorations the
JRootPane is providing.

See Also:
Returns:One of NONE, FRAME,
       PLAIN_DIALOG, INFORMATION_DIALOG,
       ERROR_DIALOG, COLOR_CHOOSER_DIALOG,
       FILE_CHOOSER_DIALOG, QUESTION_DIALOG or
       WARNING_DIALOG.
Since:1.4
/**
     * Returns a constant identifying the type of Window decorations the
     * <code>JRootPane</code> is providing.
     *
     * @return One of <code>NONE</code>, <code>FRAME</code>,
     *        <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
     *        <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
     *        <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code> or
     *        <code>WARNING_DIALOG</code>.
     * @see #setWindowDecorationStyle
     * @since 1.4
     */
    public int getWindowDecorationStyle() {
        return windowDecorationStyle;
    }

    
Sets the type of Window decorations (such as borders, widgets for
closing a Window, title ...) the JRootPane should
provide. The default is to provide no Window decorations
(NONE).


This is only a hint, and some look and feels may not support
this.
This is a bound property.

Params:
  • windowDecorationStyle – Constant identifying Window decorations
       to provide.
Throws:
  • IllegalArgumentException – if style is
       not one of: NONE, FRAME,
       PLAIN_DIALOG, INFORMATION_DIALOG,
       ERROR_DIALOG, COLOR_CHOOSER_DIALOG,
       FILE_CHOOSER_DIALOG, QUESTION_DIALOG, or
       WARNING_DIALOG.
See Also:
Since:1.4
/**
     * Sets the type of Window decorations (such as borders, widgets for
     * closing a Window, title ...) the <code>JRootPane</code> should
     * provide. The default is to provide no Window decorations
     * (<code>NONE</code>).
     * <p>
     * This is only a hint, and some look and feels may not support
     * this.
     * This is a bound property.
     *
     * @param windowDecorationStyle Constant identifying Window decorations
     *        to provide.
     * @see JDialog#setDefaultLookAndFeelDecorated
     * @see JFrame#setDefaultLookAndFeelDecorated
     * @see LookAndFeel#getSupportsWindowDecorations
     * @throws IllegalArgumentException if <code>style</code> is
     *        not one of: <code>NONE</code>, <code>FRAME</code>,
     *        <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
     *        <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
     *        <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code>, or
     *        <code>WARNING_DIALOG</code>.
     * @since 1.4
     */
    @BeanProperty(expert = true, visualUpdate = true, enumerationValues = {
            "JRootPane.NONE",
            "JRootPane.FRAME",
            "JRootPane.PLAIN_DIALOG",
            "JRootPane.INFORMATION_DIALOG",
            "JRootPane.ERROR_DIALOG",
            "JRootPane.COLOR_CHOOSER_DIALOG",
            "JRootPane.FILE_CHOOSER_DIALOG",
            "JRootPane.QUESTION_DIALOG",
            "JRootPane.WARNING_DIALOG"}, description
            = "Identifies the type of Window decorations to provide")
    public void setWindowDecorationStyle(int windowDecorationStyle) {
        if (windowDecorationStyle < 0 ||
                  windowDecorationStyle > WARNING_DIALOG) {
            throw new IllegalArgumentException("Invalid decoration style");
        }
        int oldWindowDecorationStyle = getWindowDecorationStyle();
        this.windowDecorationStyle = windowDecorationStyle;
        firePropertyChange("windowDecorationStyle",
                            oldWindowDecorationStyle,
                            windowDecorationStyle);
    }

    
Returns the L&F object that renders this component.

Returns:LabelUI object
Since:1.3
/**
     * Returns the L&amp;F object that renders this component.
     *
     * @return <code>LabelUI</code> object
     * @since 1.3
     */
    public RootPaneUI getUI() {
        return (RootPaneUI)ui;
    }

    
Sets the L&F object that renders this component.

Params:
  • ui –  the LabelUI L&F object
See Also:
Since:1.3
/**
     * Sets the L&amp;F object that renders this component.
     *
     * @param ui  the <code>LabelUI</code> L&amp;F object
     * @see UIDefaults#getUI
     * @since 1.3
     */
    @BeanProperty(expert = true, hidden = true, visualUpdate = true, description
            = "The UI object that implements the Component's LookAndFeel.")
    public void setUI(RootPaneUI ui) {
        super.setUI(ui);
    }


    
Resets the UI property to a value from the current look and feel.

See Also:
  • updateUI.updateUI
/**
     * Resets the UI property to a value from the current look and feel.
     *
     * @see JComponent#updateUI
     */
    public void updateUI() {
        setUI((RootPaneUI)UIManager.getUI(this));
    }


    
Returns a string that specifies the name of the L&F class
that renders this component.

See Also:
Returns:the string "RootPaneUI"
/**
     * Returns a string that specifies the name of the L&amp;F class
     * that renders this component.
     *
     * @return the string "RootPaneUI"
     *
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }

    
Called by the constructor methods to create the default
layeredPane.
Bt default it creates a new JLayeredPane.

Returns:the default layeredPane
/**
      * Called by the constructor methods to create the default
      * <code>layeredPane</code>.
      * Bt default it creates a new <code>JLayeredPane</code>.
      * @return the default <code>layeredPane</code>
      */
    protected JLayeredPane createLayeredPane() {
        JLayeredPane p = new JLayeredPane();
        p.setName(this.getName()+".layeredPane");
        return p;
    }

    
Called by the constructor methods to create the default
contentPane.
By default this method creates a new JComponent add sets a
BorderLayout as its LayoutManager.

Returns:the default contentPane
/**
     * Called by the constructor methods to create the default
     * <code>contentPane</code>.
     * By default this method creates a new <code>JComponent</code> add sets a
     * <code>BorderLayout</code> as its <code>LayoutManager</code>.
     * @return the default <code>contentPane</code>
     */
    protected Container createContentPane() {
        JComponent c = new JPanel();
        c.setName(this.getName()+".contentPane");
        c.setLayout(new BorderLayout() {
            /* This BorderLayout subclass maps a null constraint to CENTER.
             * Although the reference BorderLayout also does this, some VMs
             * throw an IllegalArgumentException.
             */
            public void addLayoutComponent(Component comp, Object constraints) {
                if (constraints == null) {
                    constraints = BorderLayout.CENTER;
                }
                super.addLayoutComponent(comp, constraints);
            }
        });
        return c;
    }

    
Called by the constructor methods to create the default
glassPane.
By default this method creates a new JComponent
with visibility set to false.

Returns:the default glassPane
/**
      * Called by the constructor methods to create the default
      * <code>glassPane</code>.
      * By default this method creates a new <code>JComponent</code>
      * with visibility set to false.
      * @return the default <code>glassPane</code>
      */
    protected Component createGlassPane() {
        JComponent c = new JPanel();
        c.setName(this.getName()+".glassPane");
        c.setVisible(false);
        ((JPanel)c).setOpaque(false);
        return c;
    }

    
Called by the constructor methods to create the default
layoutManager.

Returns:the default layoutManager.
/**
     * Called by the constructor methods to create the default
     * <code>layoutManager</code>.
     * @return the default <code>layoutManager</code>.
     */
    protected LayoutManager createRootLayout() {
        return new RootLayout();
    }

    
Adds or changes the menu bar used in the layered pane.

Params:
  • menu – the JMenuBar to add
/**
     * Adds or changes the menu bar used in the layered pane.
     * @param menu the <code>JMenuBar</code> to add
     */
    public void setJMenuBar(JMenuBar menu) {
        if(menuBar != null && menuBar.getParent() == layeredPane)
            layeredPane.remove(menuBar);
        menuBar = menu;

        if(menuBar != null) {
            menuBar.updateUI();
            layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
        }
    }

    
Specifies the menu bar value.

Params:
  • menu – the JMenuBar to add.
Deprecated:As of Swing version 1.0.3
 replaced by setJMenuBar(JMenuBar menu).
/**
     * Specifies the menu bar value.
     * @deprecated As of Swing version 1.0.3
     *  replaced by <code>setJMenuBar(JMenuBar menu)</code>.
     * @param menu the <code>JMenuBar</code> to add.
     */
    @Deprecated
    public void setMenuBar(JMenuBar menu){
        if(menuBar != null && menuBar.getParent() == layeredPane)
            layeredPane.remove(menuBar);
        menuBar = menu;

        if(menuBar != null)
            layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
    }

    
Returns the menu bar from the layered pane.

Returns:the JMenuBar used in the pane
/**
     * Returns the menu bar from the layered pane.
     * @return the <code>JMenuBar</code> used in the pane
     */
    public JMenuBar getJMenuBar() { return menuBar; }

    
Returns the menu bar value.

Deprecated:As of Swing version 1.0.3
 replaced by getJMenuBar().
Returns:the JMenuBar used in the pane
/**
     * Returns the menu bar value.
     * @deprecated As of Swing version 1.0.3
     *  replaced by <code>getJMenuBar()</code>.
     * @return the <code>JMenuBar</code> used in the pane
     */
    @Deprecated
    public JMenuBar getMenuBar() { return menuBar; }

    
Sets the content pane -- the container that holds the components
parented by the root pane.


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:
  • content – the Container to use for component-contents
Throws:
/**
     * Sets the content pane -- the container that holds the components
     * parented by the root pane.
     * <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 content the <code>Container</code> to use for component-contents
     * @exception java.awt.IllegalComponentStateException (a runtime
     *            exception) if the content pane parameter is <code>null</code>
     */
    public void setContentPane(Container content) {
        if(content == null)
            throw new IllegalComponentStateException("contentPane cannot be set to null.");
        if(contentPane != null && contentPane.getParent() == layeredPane)
            layeredPane.remove(contentPane);
        contentPane = content;

        layeredPane.add(contentPane, JLayeredPane.FRAME_CONTENT_LAYER);
    }

    
Returns the content pane -- the container that holds the components
parented by the root pane.

Returns:the Container that holds the component-contents
/**
     * Returns the content pane -- the container that holds the components
     * parented by the root pane.
     *
     * @return the <code>Container</code> that holds the component-contents
     */
    public Container getContentPane() { return contentPane; }

// PENDING(klobad) Should this reparent the contentPane and MenuBar?
    
Sets the layered pane for the root pane. The layered pane
typically holds a content pane and an optional JMenuBar.

Params:
  • layered –  the JLayeredPane to use
Throws:
/**
     * Sets the layered pane for the root pane. The layered pane
     * typically holds a content pane and an optional <code>JMenuBar</code>.
     *
     * @param layered  the <code>JLayeredPane</code> to use
     * @exception java.awt.IllegalComponentStateException (a runtime
     *            exception) if the layered pane parameter is <code>null</code>
     */
    public void setLayeredPane(JLayeredPane layered) {
        if(layered == null)
            throw new IllegalComponentStateException("layeredPane cannot be set to null.");
        if(layeredPane != null && layeredPane.getParent() == this)
            this.remove(layeredPane);
        layeredPane = layered;

        this.add(layeredPane, -1);
    }
    
Gets the layered pane used by the root pane. The layered pane
typically holds a content pane and an optional JMenuBar.

Returns:the JLayeredPane currently in use
/**
     * Gets the layered pane used by the root pane. The layered pane
     * typically holds a content pane and an optional <code>JMenuBar</code>.
     *
     * @return the <code>JLayeredPane</code> currently in use
     */
    public JLayeredPane getLayeredPane() { return layeredPane; }

    
Sets a specified Component to be the glass pane for this
root pane.  The glass pane should normally be a lightweight,
transparent component, because it will be made visible when
ever the root pane needs to grab input events.


The new glass pane's visibility is changed to match that of
the current glass pane.  An implication of this is that care
must be taken when you want to replace the glass pane and
make it visible.  Either of the following will work:

  root.setGlassPane(newGlassPane);
  newGlassPane.setVisible(true);


or:

  root.getGlassPane().setVisible(true);
  root.setGlassPane(newGlassPane);



Params:
  • glass – the Component to use as the glass pane
             for this JRootPane
Throws:
/**
     * Sets a specified <code>Component</code> to be the glass pane for this
     * root pane.  The glass pane should normally be a lightweight,
     * transparent component, because it will be made visible when
     * ever the root pane needs to grab input events.
     * <p>
     * The new glass pane's visibility is changed to match that of
     * the current glass pane.  An implication of this is that care
     * must be taken when you want to replace the glass pane and
     * make it visible.  Either of the following will work:
     * <pre>
     *   root.setGlassPane(newGlassPane);
     *   newGlassPane.setVisible(true);
     * </pre>
     * or:
     * <pre>
     *   root.getGlassPane().setVisible(true);
     *   root.setGlassPane(newGlassPane);
     * </pre>
     *
     * @param glass the <code>Component</code> to use as the glass pane
     *              for this <code>JRootPane</code>
     * @exception NullPointerException if the <code>glass</code> parameter is
     *          <code>null</code>
     */
    public void setGlassPane(Component glass) {
        if (glass == null) {
            throw new NullPointerException("glassPane cannot be set to null.");
        }

        glass.setMixingCutoutShape(new Rectangle());

        boolean visible = false;
        if (glassPane != null && glassPane.getParent() == this) {
            this.remove(glassPane);
            visible = glassPane.isVisible();
        }

        glass.setVisible(visible);
        glassPane = glass;
        this.add(glassPane, 0);
        if (visible) {
            repaint();
        }
    }

    
Returns the current glass pane for this JRootPane.

See Also:
Returns:the current glass pane
/**
     * Returns the current glass pane for this <code>JRootPane</code>.
     * @return the current glass pane
     * @see #setGlassPane
     */
    public Component getGlassPane() {
        return glassPane;
    }

    
If a descendant of this JRootPane calls
revalidate, validate from here on down.


Deferred requests to layout a component and its descendents again.
For example, calls to revalidate, are pushed upwards to
either a JRootPane or a JScrollPane
because both classes override isValidateRoot to return true.

See Also:
Returns:true
/**
     * If a descendant of this <code>JRootPane</code> calls
     * <code>revalidate</code>, validate from here on down.
     *<p>
     * Deferred requests to layout a component and its descendents again.
     * For example, calls to <code>revalidate</code>, are pushed upwards to
     * either a <code>JRootPane</code> or a <code>JScrollPane</code>
     * because both classes override <code>isValidateRoot</code> to return true.
     *
     * @see JComponent#isValidateRoot
     * @see java.awt.Container#isValidateRoot
     * @return true
     */
    @Override
    public boolean isValidateRoot() {
        return true;
    }

    
The glassPane and contentPane
have the same bounds, which means JRootPane
does not tiles its children and this should return false.
On the other hand, the glassPane
is normally not visible, and so this can return true if the
glassPane isn't visible. Therefore, the
return value here depends upon the visibility of the
glassPane.

Returns:true if this component's children don't overlap
/**
     * The <code>glassPane</code> and <code>contentPane</code>
     * have the same bounds, which means <code>JRootPane</code>
     * does not tiles its children and this should return false.
     * On the other hand, the <code>glassPane</code>
     * is normally not visible, and so this can return true if the
     * <code>glassPane</code> isn't visible. Therefore, the
     * return value here depends upon the visibility of the
     * <code>glassPane</code>.
     *
     * @return true if this component's children don't overlap
     */
    public boolean isOptimizedDrawingEnabled() {
        return !glassPane.isVisible();
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    public void addNotify() {
        super.addNotify();
        enableEvents(AWTEvent.KEY_EVENT_MASK);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    public void removeNotify() {
        super.removeNotify();
    }


    
Sets the defaultButton property,
which determines the current default button for this JRootPane.
The default button is the button which will be activated
when a UI-defined activation event (typically the Enter key)
occurs in the root pane regardless of whether or not the button
has keyboard focus (unless there is another component within
the root pane which consumes the activation event,
such as a JTextPane).
For default activation to work, the button must be an enabled
descendent of the root pane when activation occurs.
To remove a default button from this root pane, set this
property to null.

Params:
  • defaultButton – the JButton which is to be the default button
See Also:
  • isDefaultButton.isDefaultButton
/**
     * Sets the <code>defaultButton</code> property,
     * which determines the current default button for this <code>JRootPane</code>.
     * The default button is the button which will be activated
     * when a UI-defined activation event (typically the <b>Enter</b> key)
     * occurs in the root pane regardless of whether or not the button
     * has keyboard focus (unless there is another component within
     * the root pane which consumes the activation event,
     * such as a <code>JTextPane</code>).
     * For default activation to work, the button must be an enabled
     * descendent of the root pane when activation occurs.
     * To remove a default button from this root pane, set this
     * property to <code>null</code>.
     *
     * @see JButton#isDefaultButton
     * @param defaultButton the <code>JButton</code> which is to be the default button
     */
    @BeanProperty(description
            = "The button activated by default in this root pane")
    public void setDefaultButton(JButton defaultButton) {
        JButton oldDefault = this.defaultButton;

        if (oldDefault != defaultButton) {
            this.defaultButton = defaultButton;

            if (oldDefault != null) {
                oldDefault.repaint();
            }
            if (defaultButton != null) {
                defaultButton.repaint();
            }
        }

        firePropertyChange("defaultButton", oldDefault, defaultButton);
    }

    
Returns the value of the defaultButton property.

See Also:
Returns:the JButton which is currently the default button
/**
     * Returns the value of the <code>defaultButton</code> property.
     * @return the <code>JButton</code> which is currently the default button
     * @see #setDefaultButton
     */
    public JButton getDefaultButton() {
        return defaultButton;
    }

    final void setUseTrueDoubleBuffering(boolean useTrueDoubleBuffering) {
        this.useTrueDoubleBuffering = useTrueDoubleBuffering;
    }

    final boolean getUseTrueDoubleBuffering() {
        return useTrueDoubleBuffering;
    }

    final void disableTrueDoubleBuffering() {
        if (useTrueDoubleBuffering) {
            if (!IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING) {
                if (LOG_DISABLE_TRUE_DOUBLE_BUFFERING) {
                    System.out.println("Disabling true double buffering for " +
                                       this);
                    Thread.dumpStack();
                }
                useTrueDoubleBuffering = false;
                RepaintManager.currentManager(this).
                        doubleBufferingChanged(this);
            }
        }
    }

    
Overridden to enforce the position of the glass component as
the zero child.

Params:
  • comp – the component to be enhanced
  • constraints – the constraints to be respected
  • index – the index
/**
     * Overridden to enforce the position of the glass component as
     * the zero child.
     *
     * @param comp the component to be enhanced
     * @param constraints the constraints to be respected
     * @param index the index
     */
    protected void addImpl(Component comp, Object constraints, int index) {
        super.addImpl(comp, constraints, index);

        /// We are making sure the glassPane is on top.
        if(glassPane != null
            && glassPane.getParent() == this
            && getComponent(0) != glassPane) {
            add(glassPane, 0);
        }
    }


///////////////////////////////////////////////////////////////////////////////
//// Begin Inner Classes
///////////////////////////////////////////////////////////////////////////////


    
A custom layout manager that is responsible for the layout of
layeredPane, glassPane, and menuBar.


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. 
/**
     * A custom layout manager that is responsible for the layout of
     * layeredPane, glassPane, and menuBar.
     * <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&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected class RootLayout implements LayoutManager2, Serializable
    {
        
Returns the amount of space the layout would like to have.

Params:
  • parent – the Container for which this layout manager
is being used
Returns:a Dimension object containing the layout's preferred size
/**
         * Returns the amount of space the layout would like to have.
         *
         * @param parent the Container for which this layout manager
         * is being used
         * @return a Dimension object containing the layout's preferred size
         */
        public Dimension preferredLayoutSize(Container parent) {
            Dimension rd, mbd;
            Insets i = getInsets();

            if(contentPane != null) {
                rd = contentPane.getPreferredSize();
            } else {
                rd = parent.getSize();
            }
            if(menuBar != null && menuBar.isVisible()) {
                mbd = menuBar.getPreferredSize();
            } else {
                mbd = new Dimension(0, 0);
            }
            return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
                                        rd.height + mbd.height + i.top + i.bottom);
        }

        
Returns the minimum amount of space the layout needs.

Params:
  • parent – the Container for which this layout manager
is being used
Returns:a Dimension object containing the layout's minimum size
/**
         * Returns the minimum amount of space the layout needs.
         *
         * @param parent the Container for which this layout manager
         * is being used
         * @return a Dimension object containing the layout's minimum size
         */
        public Dimension minimumLayoutSize(Container parent) {
            Dimension rd, mbd;
            Insets i = getInsets();
            if(contentPane != null) {
                rd = contentPane.getMinimumSize();
            } else {
                rd = parent.getSize();
            }
            if(menuBar != null && menuBar.isVisible()) {
                mbd = menuBar.getMinimumSize();
            } else {
                mbd = new Dimension(0, 0);
            }
            return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
                        rd.height + mbd.height + i.top + i.bottom);
        }

        
Returns the maximum amount of space the layout can use.

Params:
  • target – the Container for which this layout manager
is being used
Returns:a Dimension object containing the layout's maximum size
/**
         * Returns the maximum amount of space the layout can use.
         *
         * @param target the Container for which this layout manager
         * is being used
         * @return a Dimension object containing the layout's maximum size
         */
        public Dimension maximumLayoutSize(Container target) {
            Dimension rd, mbd;
            Insets i = getInsets();
            if(menuBar != null && menuBar.isVisible()) {
                mbd = menuBar.getMaximumSize();
            } else {
                mbd = new Dimension(0, 0);
            }
            if(contentPane != null) {
                rd = contentPane.getMaximumSize();
            } else {
                // This is silly, but should stop an overflow error
                rd = new Dimension(Integer.MAX_VALUE,
                        Integer.MAX_VALUE - i.top - i.bottom - mbd.height - 1);
            }
            return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
                                         rd.height + mbd.height + i.top + i.bottom);
        }

        
Instructs the layout manager to perform the layout for the specified
container.

Params:
  • parent – the Container for which this layout manager
is being used
/**
         * Instructs the layout manager to perform the layout for the specified
         * container.
         *
         * @param parent the Container for which this layout manager
         * is being used
         */
        public void layoutContainer(Container parent) {
            Rectangle b = parent.getBounds();
            Insets i = getInsets();
            int contentY = 0;
            int w = b.width - i.right - i.left;
            int h = b.height - i.top - i.bottom;

            if(layeredPane != null) {
                layeredPane.setBounds(i.left, i.top, w, h);
            }
            if(glassPane != null) {
                glassPane.setBounds(i.left, i.top, w, h);
            }
            // Note: This is laying out the children in the layeredPane,
            // technically, these are not our children.
            if(menuBar != null && menuBar.isVisible()) {
                Dimension mbd = menuBar.getPreferredSize();
                menuBar.setBounds(0, 0, w, mbd.height);
                contentY += mbd.height;
            }
            if(contentPane != null) {
                contentPane.setBounds(0, contentY, w, h - contentY);
            }
        }

        public void addLayoutComponent(String name, Component comp) {}
        public void removeLayoutComponent(Component comp) {}
        public void addLayoutComponent(Component comp, Object constraints) {}
        public float getLayoutAlignmentX(Container target) { return 0.0f; }
        public float getLayoutAlignmentY(Container target) { return 0.0f; }
        public void invalidateLayout(Container target) {}
    }

    
Returns a string representation of this JRootPane.
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 JRootPane.
/**
     * Returns a string representation of this <code>JRootPane</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>JRootPane</code>.
     */
    protected String paramString() {
        return super.paramString();
    }

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

    
Gets the AccessibleContext associated with this
JRootPane. For root panes, the
AccessibleContext takes the form of an
AccessibleJRootPane.
A new AccessibleJRootPane instance is created if necessary.

Returns:an AccessibleJRootPane that serves as the
        AccessibleContext of this JRootPane
/**
     * Gets the <code>AccessibleContext</code> associated with this
     * <code>JRootPane</code>. For root panes, the
     * <code>AccessibleContext</code> takes the form of an
     * <code>AccessibleJRootPane</code>.
     * A new <code>AccessibleJRootPane</code> instance is created if necessary.
     *
     * @return an <code>AccessibleJRootPane</code> that serves as the
     *         <code>AccessibleContext</code> of this <code>JRootPane</code>
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJRootPane();
        }
        return accessibleContext;
    }

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


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. 
/**
     * This class implements accessibility support for the
     * <code>JRootPane</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to root pane user-interface elements.
     * <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&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected class AccessibleJRootPane extends AccessibleJComponent {
        
Get the role of this object.

Returns:an instance of AccessibleRole describing the role of
the object
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of
         * the object
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.ROOT_PANE;
        }

        
Returns the number of accessible children of the object.

Returns:the number of accessible children of the object.
/**
         * Returns the number of accessible children of the object.
         *
         * @return the number of accessible children of the object.
         */
        public int getAccessibleChildrenCount() {
            return super.getAccessibleChildrenCount();
        }

        
Returns the specified Accessible child of the object.  The Accessible
children of an Accessible object are zero-based, so the first child
of an Accessible child is at index 0, the second child is at index 1,
and so on.

Params:
  • i – zero-based index of child
See Also:
Returns:the Accessible child of the object
/**
         * Returns the specified Accessible child of the object.  The Accessible
         * children of an Accessible object are zero-based, so the first child
         * of an Accessible child is at index 0, the second child is at index 1,
         * and so on.
         *
         * @param i zero-based index of child
         * @return the Accessible child of the object
         * @see #getAccessibleChildrenCount
         */
        public Accessible getAccessibleChild(int i) {
            return super.getAccessibleChild(i);
        }
    } // inner class AccessibleJRootPane
}