JRootPane

java.lang.Object
- java.awt.Component
- - java.awt.Container
  - - javax.swing.JComponent
    - - javax.swing.JRootPane

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible
```
public class JRootPane
extends JComponent
implements Accessible
```
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.

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.
See Also:

JLayeredPane, JMenuBar, JWindow, JFrame, JDialog, JApplet, JInternalFrame, JComponent, BoxLayout, Mixing Heavy and Light Components

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
`protected class`	`JRootPane.AccessibleJRootPane` This class implements accessibility support for the `JRootPane` class.
`protected class`	`JRootPane.RootLayout` A custom layout manager that is responsible for the layout of layeredPane, glassPane, and menuBar.

Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields

Modifier and Type	Field and Description
`static int`	`COLOR_CHOOSER_DIALOG` Constant used for the windowDecorationStyle property.
`protected Container`	`contentPane` The content pane.
`protected JButton`	`defaultButton` The button that gets activated when the pane has the focus and a UI-specific action like pressing the Enter key occurs.
`protected javax.swing.JRootPane.DefaultAction`	`defaultPressAction` Deprecated. As of Java 2 platform v1.3.
`protected javax.swing.JRootPane.DefaultAction`	`defaultReleaseAction` Deprecated. As of Java 2 platform v1.3.
`static int`	`ERROR_DIALOG` Constant used for the windowDecorationStyle property.
`static int`	`FILE_CHOOSER_DIALOG` Constant used for the windowDecorationStyle property.
`static int`	`FRAME` Constant used for the windowDecorationStyle property.
`protected Component`	`glassPane` The glass pane that overlays the menu bar and content pane, so it can intercept mouse movements and such.
`static int`	`INFORMATION_DIALOG` Constant used for the windowDecorationStyle property.
`protected JLayeredPane`	`layeredPane` The layered pane that manages the menu bar and content pane.
`protected JMenuBar`	`menuBar` The menu bar.
`static int`	`NONE` Constant used for the windowDecorationStyle property.
`static int`	`PLAIN_DIALOG` Constant used for the windowDecorationStyle property.
`static int`	`QUESTION_DIALOG` Constant used for the windowDecorationStyle property.
`static int`	`WARNING_DIALOG` Constant used for the windowDecorationStyle property.

Fields inherited from class javax.swing.JComponent
listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor and Description
`JRootPane()` Creates a `JRootPane`, setting up its `glassPane`, `layeredPane`, and `contentPane`.

Method Summary

All Methods

Instance Methods

Concrete Methods

Deprecated Methods
Modifier and Type	Method and Description
`protected void`	`addImpl(Component comp, Object constraints, int index)` Overridden to enforce the position of the glass component as the zero child.
`void`	`addNotify()` Notifies this component that it now has a parent component.
`protected Container`	`createContentPane()` Called by the constructor methods to create the default `contentPane`.
`protected Component`	`createGlassPane()` Called by the constructor methods to create the default `glassPane`.
`protected JLayeredPane`	`createLayeredPane()` Called by the constructor methods to create the default `layeredPane`.
`protected LayoutManager`	`createRootLayout()` Called by the constructor methods to create the default `layoutManager`.
`AccessibleContext`	`getAccessibleContext()` Gets the `AccessibleContext` associated with this `JRootPane`.
`Container`	`getContentPane()` Returns the content pane -- the container that holds the components parented by the root pane.
`JButton`	`getDefaultButton()` Returns the value of the `defaultButton` property.
`Component`	`getGlassPane()` Returns the current glass pane for this `JRootPane`.
`JMenuBar`	`getJMenuBar()` Returns the menu bar from the layered pane.
`JLayeredPane`	`getLayeredPane()` Gets the layered pane used by the root pane.
`JMenuBar`	`getMenuBar()` Deprecated. As of Swing version 1.0.3 replaced by `getJMenuBar()`.
`RootPaneUI`	`getUI()` Returns the L&F object that renders this component.
`String`	`getUIClassID()` Returns a string that specifies the name of the L&F class that renders this component.
`int`	`getWindowDecorationStyle()` Returns a constant identifying the type of Window decorations the `JRootPane` is providing.
`boolean`	`isOptimizedDrawingEnabled()` The `glassPane` and `contentPane` have the same bounds, which means `JRootPane` does not tiles its children and this should return false.
`boolean`	`isValidateRoot()` If a descendant of this `JRootPane` calls `revalidate`, validate from here on down.
`protected String`	`paramString()` Returns a string representation of this `JRootPane`.
`void`	`removeNotify()` Notifies this component that it no longer has a parent component.
`void`	`setContentPane(Container content)` Sets the content pane -- the container that holds the components parented by the root pane.
`void`	`setDefaultButton(JButton defaultButton)` Sets the `defaultButton` property, which determines the current default button for this `JRootPane`.
`void`	`setDoubleBuffered(boolean aFlag)` Sets whether this component should use a buffer to paint.
`void`	`setGlassPane(Component glass)` Sets a specified `Component` to be the glass pane for this root pane.
`void`	`setJMenuBar(JMenuBar menu)` Adds or changes the menu bar used in the layered pane.
`void`	`setLayeredPane(JLayeredPane layered)` Sets the layered pane for the root pane.
`void`	`setMenuBar(JMenuBar menu)` Deprecated. As of Swing version 1.0.3 replaced by `setJMenuBar(JMenuBar menu)`.
`void`	`setUI(RootPaneUI ui)` Sets the L&F object that renders this component.
`void`	`setWindowDecorationStyle(int windowDecorationStyle)` Sets the type of Window decorations (such as borders, widgets for closing a Window, title ...) the `JRootPane` should provide.
`void`	`updateUI()` Resets the UI property to a value from the current look and feel.

Methods inherited from class javax.swing.JComponent
addAncestorListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - NONE
```
public static final int NONE
```
    Constant used for the windowDecorationStyle property. Indicates that the JRootPane should not provide any sort of Window decorations.
    
    Since:
    
    1.4
    
    See Also:
    
    Constant Field Values
  - FRAME
```
public static final int FRAME
```
    Constant used for the windowDecorationStyle property. Indicates that the JRootPane should provide decorations appropriate for a Frame.
    
    Since:
    
    1.4
    
    See Also:
    
    Constant Field Values
  - PLAIN_DIALOG
```
public static final int PLAIN_DIALOG
```
    Constant used for the windowDecorationStyle property. Indicates that the JRootPane should provide decorations appropriate for a Dialog.
    
    Since:
    
    1.4
    
    See Also:
    
    Constant Field Values
  - INFORMATION_DIALOG
```
public static final int INFORMATION_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - ERROR_DIALOG
```
public static final int ERROR_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - COLOR_CHOOSER_DIALOG
```
public static final int COLOR_CHOOSER_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - FILE_CHOOSER_DIALOG
```
public static final int FILE_CHOOSER_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - QUESTION_DIALOG
```
public static final int QUESTION_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - WARNING_DIALOG
```
public static final int WARNING_DIALOG
```
    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
    
    See Also:
    
    Constant Field Values
  - menuBar
```
protected JMenuBar menuBar
```
    The menu bar.
  - contentPane
```
protected Container contentPane
```
    The content pane.
  - layeredPane
```
protected JLayeredPane layeredPane
```
    The layered pane that manages the menu bar and content pane.
  - glassPane
```
protected Component glassPane
```
    The glass pane that overlays the menu bar and content pane, so it can intercept mouse movements and such.
  - defaultButton
```
protected JButton defaultButton
```
    The button that gets activated when the pane has the focus and a UI-specific action like pressing the Enter key occurs.
  - defaultPressAction
```
@Deprecated
protected javax.swing.JRootPane.DefaultAction defaultPressAction
```
    Deprecated. As of Java 2 platform v1.3.
    
    As of Java 2 platform v1.3 this unusable field is no longer used. To override the default button you should replace the Action in the JRootPane's ActionMap. Please refer to the key bindings specification for further details.
    
    See Also:
    
    defaultButton
  - defaultReleaseAction
```
@Deprecated
protected javax.swing.JRootPane.DefaultAction defaultReleaseAction
```
    Deprecated. As of Java 2 platform v1.3.
    
    As of Java 2 platform v1.3 this unusable field is no longer used. To override the default button you should replace the Action in the JRootPane's ActionMap. Please refer to the key bindings specification for further details.
    
    See Also:
    
    defaultButton
- Constructor Detail
  - JRootPane
```
public JRootPane()
```
    Creates a JRootPane, setting up its glassPane, layeredPane, and contentPane.
- Method Detail
  - setDoubleBuffered
```
public void setDoubleBuffered(boolean aFlag)
```
    Sets whether this component should use a buffer to paint. If set to true, all the drawing from this component will be done in an offscreen painting buffer. The offscreen painting buffer will the be copied onto the screen. If a Component is buffered and one of its ancestor is also buffered, the ancestor buffer will be used.
    
    Overrides:
    
    setDoubleBuffered in class JComponent
    
    Parameters:
    
    aFlag - if true, set this component to be double buffered
    
    Since:
    
    1.6
  - getWindowDecorationStyle
```
public int getWindowDecorationStyle()
```
    Returns a constant identifying the type of Window decorations the JRootPane is providing.
    
    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
    
    See Also:
    
    setWindowDecorationStyle(int)
  - setWindowDecorationStyle
```
public void setWindowDecorationStyle(int 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.
    
    Parameters:
    
    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.
    
    Since:
    
    1.4
    
    See Also:
    
    JDialog.setDefaultLookAndFeelDecorated(boolean), JFrame.setDefaultLookAndFeelDecorated(boolean), LookAndFeel.getSupportsWindowDecorations()
  - getUI
```
public RootPaneUI getUI()
```
    Returns the L&F object that renders this component.
    
    Returns:
    
    LabelUI object
    
    Since:
    
    1.3
  - setUI
```
public void setUI(RootPaneUI ui)
```
    Sets the L&F object that renders this component.
    
    Parameters:
    
    ui - the LabelUI L&F object
    
    Since:
    
    1.3
    
    See Also:
    
    UIDefaults.getUI(javax.swing.JComponent)
  - updateUI
```
public void updateUI()
```
    Resets the UI property to a value from the current look and feel.
    
    Overrides:
    
    updateUI in class JComponent
    
    See Also:
    
    JComponent.updateUI()
  - getUIClassID
```
public String getUIClassID()
```
    Returns a string that specifies the name of the L&F class that renders this component.
    
    Overrides:
    
    getUIClassID in class JComponent
    
    Returns:
    
    the string "RootPaneUI"
    
    See Also:
    
    JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)
  - createLayeredPane
```
protected JLayeredPane createLayeredPane()
```
    Called by the constructor methods to create the default layeredPane. Bt default it creates a new JLayeredPane.
    
    Returns:
    
    the default layeredPane
  - createContentPane
```
protected Container createContentPane()
```
    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
  - createGlassPane
```
protected Component createGlassPane()
```
    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
  - createRootLayout
```
protected LayoutManager createRootLayout()
```
    Called by the constructor methods to create the default layoutManager.
    
    Returns:
    
    the default layoutManager.
  - setJMenuBar
```
public void setJMenuBar(JMenuBar menu)
```
    Adds or changes the menu bar used in the layered pane.
    
    Parameters:
    
    menu - the JMenuBar to add
  - setMenuBar
```
@Deprecated
public void setMenuBar(JMenuBar menu)
```
    Deprecated. As of Swing version 1.0.3 replaced by setJMenuBar(JMenuBar menu).
    
    Specifies the menu bar value.
    
    Parameters:
    
    menu - the JMenuBar to add.
  - getJMenuBar
```
public JMenuBar getJMenuBar()
```
    Returns the menu bar from the layered pane.
    
    Returns:
    
    the JMenuBar used in the pane
  - getMenuBar
```
@Deprecated
public JMenuBar getMenuBar()
```
    Deprecated. As of Swing version 1.0.3 replaced by getJMenuBar().
    
    Returns the menu bar value.
    
    Returns:
    
    the JMenuBar used in the pane
  - setContentPane
```
public void setContentPane(Container content)
```
    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.
    
    Parameters:
    
    content - the Container to use for component-contents
    
    Throws:
    
    IllegalComponentStateException - (a runtime exception) if the content pane parameter is null
  - getContentPane
```
public Container getContentPane()
```
    Returns the content pane -- the container that holds the components parented by the root pane.
    
    Returns:
    
    the Container that holds the component-contents
  - setLayeredPane
```
public void setLayeredPane(JLayeredPane layered)
```
    Sets the layered pane for the root pane. The layered pane typically holds a content pane and an optional JMenuBar.
    
    Parameters:
    
    layered - the JLayeredPane to use
    
    Throws:
    
    IllegalComponentStateException - (a runtime exception) if the layered pane parameter is null
  - getLayeredPane
```
public JLayeredPane getLayeredPane()
```
    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
  - setGlassPane
```
public void setGlassPane(Component glass)
```
    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);
 
```
    Parameters:
    
    glass - the Component to use as the glass pane for this JRootPane
    
    Throws:
    
    NullPointerException - if the glass parameter is null
  - getGlassPane
```
public Component getGlassPane()
```
    Returns the current glass pane for this JRootPane.
    
    Returns:
    
    the current glass pane
    
    See Also:
    
    setGlassPane(java.awt.Component)
  - isValidateRoot
```
public boolean isValidateRoot()
```
    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.
    
    Overrides:
    
    isValidateRoot in class JComponent
    
    Returns:
    
    true
    
    See Also:
    
    JComponent.isValidateRoot(), Container.isValidateRoot()
  - isOptimizedDrawingEnabled
```
public boolean isOptimizedDrawingEnabled()
```
    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.
    
    Overrides:
    
    isOptimizedDrawingEnabled in class JComponent
    
    Returns:
    
    true if this component's children don't overlap
  - addNotify
```
public void addNotify()
```
    Notifies this component that it now has a parent component. When this method is invoked, the chain of parent components is set up with KeyboardAction event listeners. This method is called by the toolkit internally and should not be called directly by programs.
    
    Overrides:
    
    addNotify in class JComponent
    
    See Also:
    
    JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)
  - removeNotify
```
public void removeNotify()
```
    Notifies this component that it no longer has a parent component. When this method is invoked, any KeyboardActions set up in the the chain of parent components are removed. This method is called by the toolkit internally and should not be called directly by programs.
    
    Overrides:
    
    removeNotify in class JComponent
    
    See Also:
    
    JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)
  - setDefaultButton
```
public void setDefaultButton(JButton defaultButton)
```
    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.
    
    Parameters:
    
    defaultButton - the JButton which is to be the default button
    
    See Also:
    
    JButton.isDefaultButton()
  - getDefaultButton
```
public JButton getDefaultButton()
```
    Returns the value of the defaultButton property.
    
    Returns:
    
    the JButton which is currently the default button
    
    See Also:
    
    setDefaultButton(javax.swing.JButton)
  - addImpl
```
protected void addImpl(Component comp,
                       Object constraints,
                       int index)
```
    Overridden to enforce the position of the glass component as the zero child.
    
    Overrides:
    
    addImpl in class Container
    
    Parameters:
    
    comp - the component to be enhanced
    
    constraints - the constraints to be respected
    
    index - the index
    
    See Also:
    
    Container.add(Component), Container.add(Component, int), Container.add(Component, java.lang.Object), Container.invalidate(), LayoutManager, LayoutManager2
  - paramString
```
protected String paramString()
```
    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.
    
    Overrides:
    
    paramString in class JComponent
    
    Returns:
    
    a string representation of this JRootPane.
  - getAccessibleContext
```
public AccessibleContext getAccessibleContext()
```
    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.
    
    Specified by:
    
    getAccessibleContext in interface Accessible
    
    Overrides:
    
    getAccessibleContext in class Component
    
    Returns:
    
    an AccessibleJRootPane that serves as the AccessibleContext of this JRootPane

Class JRootPane

Nested Class Summary

Nested Classes

Nested classes/interfaces inherited from class javax.swing.JComponent

Nested classes/interfaces inherited from class java.awt.Container

Nested classes/interfaces inherited from class java.awt.Component

Field Summary

Fields

Fields inherited from class javax.swing.JComponent

Fields inherited from class java.awt.Component

Fields inherited from interface java.awt.image.ImageObserver

Constructor Summary

Constructors

Method Summary

Methods inherited from class javax.swing.JComponent

Methods inherited from class java.awt.Container

Methods inherited from class java.awt.Component

Methods inherited from class java.lang.Object

Field Detail

NONE

FRAME

PLAIN_DIALOG

INFORMATION_DIALOG

ERROR_DIALOG

COLOR_CHOOSER_DIALOG

FILE_CHOOSER_DIALOG

QUESTION_DIALOG

WARNING_DIALOG

menuBar

contentPane

layeredPane

glassPane

defaultButton

defaultPressAction

defaultReleaseAction

Constructor Detail

JRootPane

Method Detail

setDoubleBuffered

getWindowDecorationStyle

setWindowDecorationStyle

getUI

setUI

updateUI

getUIClassID

createLayeredPane

createContentPane

createGlassPane

createRootLayout

setJMenuBar

setMenuBar

getJMenuBar

getMenuBar

setContentPane

getContentPane

setLayeredPane

getLayeredPane

setGlassPane

getGlassPane

isValidateRoot

isOptimizedDrawingEnabled

addNotify

removeNotify

setDefaultButton

getDefaultButton

addImpl

paramString

getAccessibleContext