public class

JRootPane

extends JComponent
implements Accessible

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

Class Overview

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 following text describes this graphic.

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 following text describes this graphic.

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:

The glassPane fills the entire viewable area of the JRootPane (bounds - insets).
The layeredPane fills the entire viewable area of the JRootPane. (bounds - insets)
The menuBar is positioned at the upper edge of the layeredPane.
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 hieararchy 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^TM has been added to the java.beans package. Please see XMLEncoder.

Summary

Nested Classes
class	JRootPane.AccessibleJRootPane	This class implements accessibility support for the `JRootPane` class.
class	JRootPane.RootLayout	A custom layout manager that is responsible for the layout of layeredPane, glassPane, and menuBar.

Constants
int	COLOR_CHOOSER_DIALOG	Constant used for the windowDecorationStyle property.
int	ERROR_DIALOG	Constant used for the windowDecorationStyle property.
int	FILE_CHOOSER_DIALOG	Constant used for the windowDecorationStyle property.
int	FRAME	Constant used for the windowDecorationStyle property.
int	INFORMATION_DIALOG	Constant used for the windowDecorationStyle property.
int	NONE	Constant used for the windowDecorationStyle property.
int	PLAIN_DIALOG	Constant used for the windowDecorationStyle property.
int	QUESTION_DIALOG	Constant used for the windowDecorationStyle property.
int	WARNING_DIALOG	Constant used for the windowDecorationStyle property.

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Inherited Constants

From class javax.swing.JComponent

From class java.awt.Component

From interface java.awt.image.ImageObserver

Fields
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 JRootPane.DefaultAction	defaultPressAction	This field is deprecated. As of Java 2 platform v1.3.
protected JRootPane.DefaultAction	defaultReleaseAction	This field is deprecated. As of Java 2 platform v1.3.
protected Component	glassPane	The glass pane that overlays the menu bar and content pane, so it can intercept mouse movements and such.
protected JLayeredPane	layeredPane	The layered pane that manages the menu bar and content pane.
protected JMenuBar	menuBar	The menu bar.

[Expand]

Inherited Fields

From class javax.swing.JComponent

Public Constructors
	JRootPane() Creates a `JRootPane`, setting up its `glassPane`, `layeredPane`, and `contentPane`.

Public Methods
void	addNotify() Notifies this component that it now has a parent component.
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() This method is 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.
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) This method is 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.

Protected Methods
void	addImpl(Component comp, Object constraints, int index) Overridden to enforce the position of the glass component as the zero child.
Container	createContentPane() Called by the constructor methods to create the default `contentPane`.
Component	createGlassPane() Called by the constructor methods to create the default `glassPane`.
JLayeredPane	createLayeredPane() Called by the constructor methods to create the default `layeredPane`.
LayoutManager	createRootLayout() Called by the constructor methods to create the default `layoutManager`.
String	paramString() Returns a string representation of this `JRootPane`.

[Expand]

Inherited Methods

From class javax.swing.JComponent

void	addAncestorListener(AncestorListener listener) Registers `listener` so that it will receive `AncestorEvents` when it or any of its ancestors move or are made visible or invisible.
void	addNotify() Notifies this component that it now has a parent component.
synchronized void	addVetoableChangeListener(VetoableChangeListener listener) Adds a `VetoableChangeListener` to the listener list.
void	computeVisibleRect(Rectangle visibleRect) Returns the `Component`'s "visible rect rectangle" - the intersection of the visible rectangles for this component and all of its ancestors.
boolean	contains(int x, int y) Gives the UI delegate an opportunity to define the precise shape of this component for the sake of mouse processing.
JToolTip	createToolTip() Returns the instance of `JToolTip` that should be used to display the tooltip.
void	disable() This method is deprecated. As of JDK version 1.1, replaced by `java.awt.Component.setEnabled(boolean)`.
void	enable() This method is deprecated. As of JDK version 1.1, replaced by `java.awt.Component.setEnabled(boolean)`.
void	firePropertyChange(String propertyName, boolean oldValue, boolean newValue) Support for reporting bound property changes for boolean properties.
void	firePropertyChange(String propertyName, char oldValue, char newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, int oldValue, int newValue) Support for reporting bound property changes for integer properties.
void	fireVetoableChange(String propertyName, Object oldValue, Object newValue) Supports reporting constrained property changes.
AccessibleContext	getAccessibleContext() Returns the `AccessibleContext` associated with this `JComponent`.
ActionListener	getActionForKeyStroke(KeyStroke aKeyStroke) Returns the object that will perform the action registered for a given keystroke.
final ActionMap	getActionMap() Returns the `ActionMap` used to determine what `Action` to fire for particular `KeyStroke` binding.
float	getAlignmentX() Overrides `Container.getAlignmentX` to return the vertical alignment.
float	getAlignmentY() Overrides `Container.getAlignmentY` to return the horizontal alignment.
AncestorListener[]	getAncestorListeners() Returns an array of all the ancestor listeners registered on this component.
boolean	getAutoscrolls() Gets the `autoscrolls` property.
int	getBaseline(int width, int height) Returns the baseline.
Component.BaselineResizeBehavior	getBaselineResizeBehavior() Returns an enum indicating how the baseline of the component changes as the size changes.
Border	getBorder() Returns the border of this component or `null` if no border is currently set.
Rectangle	getBounds(Rectangle rv) Stores the bounds of this component into "return value" `rv` and returns `rv`.
final Object	getClientProperty(Object key) Returns the value of the property with the specified key.
Graphics	getComponentGraphics(Graphics g) Returns the graphics object used to paint this component.
JPopupMenu	getComponentPopupMenu() Returns `JPopupMenu` that assigned for this component.
int	getConditionForKeyStroke(KeyStroke aKeyStroke) Returns the condition that determines whether a registered action occurs in response to the specified keystroke.
int	getDebugGraphicsOptions() Returns the state of graphics debugging.
static Locale	getDefaultLocale() Returns the default locale used to initialize each JComponent's locale property upon creation.
FontMetrics	getFontMetrics(Font font) Gets the `FontMetrics` for the specified `Font`.
Graphics	getGraphics() Returns this component's graphics context, which lets you draw on a component.
int	getHeight() Returns the current height of this component.
boolean	getInheritsPopupMenu() Returns true if the JPopupMenu should be inherited from the parent.
final InputMap	getInputMap() Returns the `InputMap` that is used when the component has focus.
final InputMap	getInputMap(int condition) Returns the `InputMap` that is used during `condition`.
InputVerifier	getInputVerifier() Returns the input verifier for this component.
Insets	getInsets() If a border has been set on this component, returns the border's insets; otherwise calls `super.getInsets`.
Insets	getInsets(Insets insets) Returns an `Insets` object containing this component's inset values.
<T extends EventListener> T[]	getListeners(Class<T> listenerType) Returns an array of all the objects currently registered as `FooListener`s upon this `JComponent`.
Point	getLocation(Point rv) Stores the x,y origin of this component into "return value" `rv` and returns `rv`.
Dimension	getMaximumSize() If the maximum size has been set to a non-`null` value just returns it.
Dimension	getMinimumSize() If the minimum size has been set to a non-`null` value just returns it.
Component	getNextFocusableComponent() This method is deprecated. As of 1.4, replaced by `FocusTraversalPolicy`.
Point	getPopupLocation(MouseEvent event) Returns the preferred location to display the popup menu in this component's coordinate system.
Dimension	getPreferredSize() If the `preferredSize` has been set to a non-`null` value just returns it.
KeyStroke[]	getRegisteredKeyStrokes() Returns the `KeyStrokes` that will initiate registered actions.
JRootPane	getRootPane() Returns the `JRootPane` ancestor for this component.
Dimension	getSize(Dimension rv) Stores the width/height of this component into "return value" `rv` and returns `rv`.
Point	getToolTipLocation(MouseEvent event) Returns the tooltip location in this component's coordinate system.
String	getToolTipText() Returns the tooltip string that has been set with `setToolTipText`.
String	getToolTipText(MouseEvent event) Returns the string to be used as the tooltip for event.
Container	getTopLevelAncestor() Returns the top-level ancestor of this component (either the containing `Window` or `Applet`), or `null` if this component has not been added to any container.
TransferHandler	getTransferHandler() Gets the `transferHandler` property.
String	getUIClassID() Returns the `UIDefaults` key used to look up the name of the `swing.plaf.ComponentUI` class that defines the look and feel for this component.
boolean	getVerifyInputWhenFocusTarget() Returns the value that indicates whether the input verifier for the current focus owner will be called before this component requests focus.
synchronized VetoableChangeListener[]	getVetoableChangeListeners() Returns an array of all the vetoable change listeners registered on this component.
Rectangle	getVisibleRect() Returns the `Component`'s "visible rectangle" - the intersection of this component's visible rectangle, `new Rectangle(0, 0, getWidth(), getHeight())`, and all of its ancestors' visible rectangles.
int	getWidth() Returns the current width of this component.
int	getX() Returns the current x coordinate of the component's origin.
int	getY() Returns the current y coordinate of the component's origin.
void	grabFocus() Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.
boolean	isDoubleBuffered() Returns whether this component should use a buffer to paint.
static boolean	isLightweightComponent(Component c) Returns true if this component is lightweight, that is, if it doesn't have a native window system peer.
boolean	isManagingFocus() This method is deprecated. As of 1.4, replaced by `Component.setFocusTraversalKeys(int, Set)` and `Container.setFocusCycleRoot(boolean)`.
boolean	isOpaque() Returns true if this component is completely opaque.
boolean	isOptimizedDrawingEnabled() Returns true if this component tiles its children -- that is, if it can guarantee that the children will not overlap.
final boolean	isPaintingForPrint() Returns `true` if the current painting operation on this component is part of a `print` operation.
boolean	isPaintingTile() Returns true if the component is currently painting a tile.
boolean	isRequestFocusEnabled() Returns `true` if this `JComponent` should get focus; otherwise returns `false`.
boolean	isValidateRoot() If this method returns true, `revalidate` calls by descendants of this component will cause the entire tree beginning with this root to be validated.
void	paint(Graphics g) Invoked by Swing to draw components.
void	paintBorder(Graphics g) Paints the component's border.
void	paintChildren(Graphics g) Paints this component's children.
void	paintComponent(Graphics g) Calls the UI delegate's paint method, if the UI delegate is non-`null`.
void	paintImmediately(int x, int y, int w, int h) Paints the specified region in this component and all of its descendants that overlap the region, immediately.
void	paintImmediately(Rectangle r) Paints the specified region now.
String	paramString() Returns a string representation of this `JComponent`.
void	print(Graphics g) Invoke this method to print the component to the specified `Graphics`.
void	printAll(Graphics g) Invoke this method to print the component.
void	printBorder(Graphics g) Prints the component's border.
void	printChildren(Graphics g) Prints this component's children.
void	printComponent(Graphics g) This is invoked during a printing operation.
void	processComponentKeyEvent(KeyEvent e) Processes any key events that the component itself recognizes.
boolean	processKeyBinding(KeyStroke ks, KeyEvent e, int condition, boolean pressed) Invoked to process the key bindings for `ks` as the result of the `KeyEvent` `e`.
void	processKeyEvent(KeyEvent e) Overrides `processKeyEvent` to process events.
void	processMouseEvent(MouseEvent e) Processes mouse events occurring on this component by dispatching them to any registered `MouseListener` objects, refer to `processMouseEvent(MouseEvent)` for a complete description of this method.
void	processMouseMotionEvent(MouseEvent e) Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED.
final void	putClientProperty(Object key, Object value) Adds an arbitrary key/value "client property" to this component.
void	registerKeyboardAction(ActionListener anAction, KeyStroke aKeyStroke, int aCondition) This method is now obsolete, please use a combination of `getActionMap()` and `getInputMap()` for similiar behavior.
void	registerKeyboardAction(ActionListener anAction, String aCommand, KeyStroke aKeyStroke, int aCondition) This method is now obsolete, please use a combination of `getActionMap()` and `getInputMap()` for similiar behavior.
void	removeAncestorListener(AncestorListener listener) Unregisters `listener` so that it will no longer receive `AncestorEvents`.
void	removeNotify() Notifies this component that it no longer has a parent component.
synchronized void	removeVetoableChangeListener(VetoableChangeListener listener) Removes a `VetoableChangeListener` from the listener list.
void	repaint(long tm, int x, int y, int width, int height) Adds the specified region to the dirty region list if the component is showing.
void	repaint(Rectangle r) Adds the specified region to the dirty region list if the component is showing.
boolean	requestDefaultFocus() This method is deprecated. As of 1.4, replaced by `FocusTraversalPolicy.getDefaultComponent(Container).requestFocus()`
void	requestFocus() Requests that this `Component` gets the input focus.
boolean	requestFocus(boolean temporary) Requests that this `Component` gets the input focus.
boolean	requestFocusInWindow(boolean temporary) Requests that this `Component` gets the input focus.
boolean	requestFocusInWindow() Requests that this `Component` gets the input focus.
void	resetKeyboardActions() Unregisters all the bindings in the first tier `InputMaps` and `ActionMap`.
void	reshape(int x, int y, int w, int h) This method is deprecated. As of JDK 5, replaced by `Component.setBounds(int, int, int, int)`. Moves and resizes this component.
void	revalidate() Supports deferred automatic layout.
void	scrollRectToVisible(Rectangle aRect) Forwards the `scrollRectToVisible()` message to the `JComponent`'s parent.
final void	setActionMap(ActionMap am) Sets the `ActionMap` to `am`.
void	setAlignmentX(float alignmentX) Sets the the vertical alignment.
void	setAlignmentY(float alignmentY) Sets the the horizontal alignment.
void	setAutoscrolls(boolean autoscrolls) Sets the `autoscrolls` property.
void	setBackground(Color bg) Sets the background color of this component.
void	setBorder(Border border) Sets the border of this component.
void	setComponentPopupMenu(JPopupMenu popup) Sets the `JPopupMenu` for this `JComponent`.
void	setDebugGraphicsOptions(int debugOptions) Enables or disables diagnostic information about every graphics operation performed within the component or one of its children.
static void	setDefaultLocale(Locale l) Sets the default locale used to initialize each JComponent's locale property upon creation.
void	setDoubleBuffered(boolean aFlag) Sets whether this component should use a buffer to paint.
void	setEnabled(boolean enabled) Sets whether or not this component is enabled.
void	setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes) Sets the focus traversal keys for a given traversal operation for this Component.
void	setFont(Font font) Sets the font for this component.
void	setForeground(Color fg) Sets the foreground color of this component.
void	setInheritsPopupMenu(boolean value) Sets whether or not `getComponentPopupMenu` should delegate to the parent if this component does not have a `JPopupMenu` assigned to it.
final void	setInputMap(int condition, InputMap map) Sets the `InputMap` to use under the condition `condition` to `map`.
void	setInputVerifier(InputVerifier inputVerifier) Sets the input verifier for this component.
void	setMaximumSize(Dimension maximumSize) Sets the maximum size of this component to a constant value.
void	setMinimumSize(Dimension minimumSize) Sets the minimum size of this component to a constant value.
void	setNextFocusableComponent(Component aComponent) This method is deprecated. As of 1.4, replaced by `FocusTraversalPolicy`
void	setOpaque(boolean isOpaque) If true the component paints every pixel within its bounds.
void	setPreferredSize(Dimension preferredSize) Sets the preferred size of this component.
void	setRequestFocusEnabled(boolean requestFocusEnabled) Provides a hint as to whether or not this `JComponent` should get focus.
void	setToolTipText(String text) Registers the text to display in a tool tip.
void	setTransferHandler(TransferHandler newHandler) Sets the `transferHandler` property, which is `null` if the component does not support data transfer operations.
void	setUI(ComponentUI newUI) Sets the look and feel delegate for this component.
void	setVerifyInputWhenFocusTarget(boolean verifyInputWhenFocusTarget) Sets the value to indicate whether input verifier for the current focus owner will be called before this component requests focus.
void	setVisible(boolean aFlag) Makes the component visible or invisible.
void	unregisterKeyboardAction(KeyStroke aKeyStroke) This method is now obsolete.
void	update(Graphics g) Calls `paint`.
void	updateUI() Resets the UI property to a value from the current look and feel.

From class java.awt.Container

void	add(Component comp, Object constraints) Adds the specified component to the end of this container.
Component	add(String name, Component comp) Adds the specified component to this container.
Component	add(Component comp, int index) Adds the specified component to this container at the given position.
Component	add(Component comp) Appends the specified component to the end of this container.
void	add(Component comp, Object constraints, int index) Adds the specified component to this container with the specified constraints at the specified index.
synchronized void	addContainerListener(ContainerListener l) Adds the specified container listener to receive container events from this container.
void	addImpl(Component comp, Object constraints, int index) Adds the specified component to this container at the specified index.
void	addNotify() Makes this Container displayable by connecting it to a native screen resource.
void	addPropertyChangeListener(String propertyName, PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list for a specific property.
void	addPropertyChangeListener(PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list.
void	applyComponentOrientation(ComponentOrientation o) Sets the `ComponentOrientation` property of this container and all components contained within it.
boolean	areFocusTraversalKeysSet(int id) Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Container.
int	countComponents() This method is deprecated. As of JDK version 1.1, replaced by getComponentCount().
void	deliverEvent(Event e) This method is deprecated. As of JDK version 1.1, replaced by `dispatchEvent(AWTEvent e)`
void	doLayout() Causes this container to lay out its components.
Component	findComponentAt(Point p) Locates the visible child component that contains the specified point.
Component	findComponentAt(int x, int y) Locates the visible child component that contains the specified position.
float	getAlignmentX() Returns the alignment along the x axis.
float	getAlignmentY() Returns the alignment along the y axis.
Component	getComponent(int n) Gets the nth component in this container.
Component	getComponentAt(int x, int y) Locates the component that contains the x,y position.
Component	getComponentAt(Point p) Gets the component that contains the specified point.
int	getComponentCount() Gets the number of components in this panel.
int	getComponentZOrder(Component comp) Returns the z-order index of the component inside the container.
Component[]	getComponents() Gets all the components in this container.
synchronized ContainerListener[]	getContainerListeners() Returns an array of all the container listeners registered on this container.
Set<AWTKeyStroke>	getFocusTraversalKeys(int id) Returns the Set of focus traversal keys for a given traversal operation for this Container.
FocusTraversalPolicy	getFocusTraversalPolicy() Returns the focus traversal policy that will manage keyboard traversal of this Container's children, or null if this Container is not a focus cycle root.
Insets	getInsets() Determines the insets of this container, which indicate the size of the container's border.
LayoutManager	getLayout() Gets the layout manager for this container.
<T extends EventListener> T[]	getListeners(Class<T> listenerType) Returns an array of all the objects currently registered as `FooListener`s upon this `Container`.
Dimension	getMaximumSize() Returns the maximum size of this container.
Dimension	getMinimumSize() Returns the minimum size of this container.
Point	getMousePosition(boolean allowChildren) Returns the position of the mouse pointer in this `Container`'s coordinate space if the `Container` is under the mouse pointer, otherwise returns `null`.
Dimension	getPreferredSize() Returns the preferred size of this container.
Insets	insets() This method is deprecated. As of JDK version 1.1, replaced by `getInsets()`.
void	invalidate() Invalidates the container.
boolean	isAncestorOf(Component c) Checks if the component is contained in the component hierarchy of this container.
boolean	isFocusCycleRoot(Container container) Returns whether the specified Container is the focus cycle root of this Container's focus traversal cycle.
boolean	isFocusCycleRoot() Returns whether this Container is the root of a focus traversal cycle.
final boolean	isFocusTraversalPolicyProvider() Returns whether this container provides focus traversal policy.
boolean	isFocusTraversalPolicySet() Returns whether the focus traversal policy has been explicitly set for this Container.
void	layout() This method is deprecated. As of JDK version 1.1, replaced by `doLayout()`.
void	list(PrintStream out, int indent) Prints a listing of this container to the specified output stream.
void	list(PrintWriter out, int indent) Prints out a list, starting at the specified indentation, to the specified print writer.
Component	locate(int x, int y) This method is deprecated. As of JDK version 1.1, replaced by `getComponentAt(int, int)`.
Dimension	minimumSize() This method is deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`.
void	paint(Graphics g) Paints the container.
void	paintComponents(Graphics g) Paints each of the components in this container.
String	paramString() Returns a string representing the state of this `Container`.
Dimension	preferredSize() This method is deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`.
void	print(Graphics g) Prints the container.
void	printComponents(Graphics g) Prints each of the components in this container.
void	processContainerEvent(ContainerEvent e) Processes container events occurring on this container by dispatching them to any registered ContainerListener objects.
void	processEvent(AWTEvent e) Processes events on this container.
void	remove(Component comp) Removes the specified component from this container.
void	remove(int index) Removes the component, specified by `index`, from this container.
void	removeAll() Removes all the components from this container.
synchronized void	removeContainerListener(ContainerListener l) Removes the specified container listener so it no longer receives container events from this container.
void	removeNotify() Makes this Container undisplayable by removing its connection to its native screen resource.
void	setComponentZOrder(Component comp, int index) Moves the specified component to the specified z-order index in the container.
void	setFocusCycleRoot(boolean focusCycleRoot) Sets whether this Container is the root of a focus traversal cycle.
void	setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes) Sets the focus traversal keys for a given traversal operation for this Container.
void	setFocusTraversalPolicy(FocusTraversalPolicy policy) Sets the focus traversal policy that will manage keyboard traversal of this Container's children, if this Container is a focus cycle root.
final void	setFocusTraversalPolicyProvider(boolean provider) Sets whether this container will be used to provide focus traversal policy.
void	setFont(Font f) Sets the font of this container.
void	setLayout(LayoutManager mgr) Sets the layout manager for this container.
void	transferFocusDownCycle() Transfers the focus down one focus traversal cycle.
void	update(Graphics g) Updates the container.
void	validate() Validates this container and all of its subcomponents.
void	validateTree() Recursively descends the container tree and recomputes the layout for any subtrees marked as needing it (those marked as invalid).

From class java.awt.Component

boolean	action(Event evt, Object what) This method is deprecated. As of JDK version 1.1, should register this component as ActionListener on component which fires action events.
void	add(PopupMenu popup) Adds the specified popup menu to the component.
synchronized void	addComponentListener(ComponentListener l) Adds the specified component listener to receive component events from this component.
synchronized void	addFocusListener(FocusListener l) Adds the specified focus listener to receive focus events from this component when this component gains input focus.
void	addHierarchyBoundsListener(HierarchyBoundsListener l) Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes.
void	addHierarchyListener(HierarchyListener l) Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes.
synchronized void	addInputMethodListener(InputMethodListener l) Adds the specified input method listener to receive input method events from this component.
synchronized void	addKeyListener(KeyListener l) Adds the specified key listener to receive key events from this component.
synchronized void	addMouseListener(MouseListener l) Adds the specified mouse listener to receive mouse events from this component.
synchronized void	addMouseMotionListener(MouseMotionListener l) Adds the specified mouse motion listener to receive mouse motion events from this component.
synchronized void	addMouseWheelListener(MouseWheelListener l) Adds the specified mouse wheel listener to receive mouse wheel events from this component.
void	addNotify() Makes this `Component` displayable by connecting it to a native screen resource.
void	addPropertyChangeListener(String propertyName, PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list for a specific property.
void	addPropertyChangeListener(PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list.
void	applyComponentOrientation(ComponentOrientation orientation) Sets the `ComponentOrientation` property of this component and all components contained within it.
boolean	areFocusTraversalKeysSet(int id) Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Component.
Rectangle	bounds() This method is deprecated. As of JDK version 1.1, replaced by `getBounds()`.
int	checkImage(Image image, ImageObserver observer) Returns the status of the construction of a screen representation of the specified image.
int	checkImage(Image image, int width, int height, ImageObserver observer) Returns the status of the construction of a screen representation of the specified image.
AWTEvent	coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent) Potentially coalesce an event being posted with an existing event.
boolean	contains(Point p) Checks whether this component "contains" the specified point, where the point's x and y coordinates are defined to be relative to the coordinate system of this component.
boolean	contains(int x, int y) Checks whether this component "contains" the specified point, where `x` and `y` are defined to be relative to the coordinate system of this component.
Image	createImage(int width, int height) Creates an off-screen drawable image to be used for double buffering.
Image	createImage(ImageProducer producer) Creates an image from the specified image producer.
VolatileImage	createVolatileImage(int width, int height, ImageCapabilities caps) Creates a volatile off-screen drawable image, with the given capabilities.
VolatileImage	createVolatileImage(int width, int height) Creates a volatile off-screen drawable image to be used for double buffering.
void	deliverEvent(Event e) This method is deprecated. As of JDK version 1.1, replaced by `dispatchEvent(AWTEvent e)`.
void	disable() This method is deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
final void	disableEvents(long eventsToDisable) Disables the events defined by the specified event mask parameter from being delivered to this component.
final void	dispatchEvent(AWTEvent e) Dispatches an event to this component or one of its sub components.
void	doLayout() Prompts the layout manager to lay out this component.
void	enable() This method is deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
void	enable(boolean b) This method is deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
final void	enableEvents(long eventsToEnable) Enables the events defined by the specified event mask parameter to be delivered to this component.
void	enableInputMethods(boolean enable) Enables or disables input method support for this component.
void	firePropertyChange(String propertyName, float oldValue, float newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, byte oldValue, byte newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, char oldValue, char newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, short oldValue, short newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, long oldValue, long newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, boolean oldValue, boolean newValue) Support for reporting bound property changes for boolean properties.
void	firePropertyChange(String propertyName, double oldValue, double newValue) Reports a bound property change.
void	firePropertyChange(String propertyName, Object oldValue, Object newValue) Support for reporting bound property changes for Object properties.
void	firePropertyChange(String propertyName, int oldValue, int newValue) Support for reporting bound property changes for integer properties.
AccessibleContext	getAccessibleContext() Gets the `AccessibleContext` associated with this `Component`.
float	getAlignmentX() Returns the alignment along the x axis.
float	getAlignmentY() Returns the alignment along the y axis.
Color	getBackground() Gets the background color of this component.
int	getBaseline(int width, int height) Returns the baseline.
Component.BaselineResizeBehavior	getBaselineResizeBehavior() Returns an enum indicating how the baseline of the component changes as the size changes.
Rectangle	getBounds(Rectangle rv) Stores the bounds of this component into "return value" rv and return rv.
Rectangle	getBounds() Gets the bounds of this component in the form of a `Rectangle` object.
ColorModel	getColorModel() Gets the instance of `ColorModel` used to display the component on the output device.
Component	getComponentAt(Point p) Returns the component or subcomponent that contains the specified point.
Component	getComponentAt(int x, int y) Determines if this component or one of its immediate subcomponents contains the (x, y) location, and if so, returns the containing component.
synchronized ComponentListener[]	getComponentListeners() Returns an array of all the component listeners registered on this component.
ComponentOrientation	getComponentOrientation() Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component.
Cursor	getCursor() Gets the cursor set in the component.
synchronized DropTarget	getDropTarget() Gets the `DropTarget` associated with this `Component`.
Container	getFocusCycleRootAncestor() Returns the Container which is the focus cycle root of this Component's focus traversal cycle.
synchronized FocusListener[]	getFocusListeners() Returns an array of all the focus listeners registered on this component.
Set<AWTKeyStroke>	getFocusTraversalKeys(int id) Returns the Set of focus traversal keys for a given traversal operation for this Component.
boolean	getFocusTraversalKeysEnabled() Returns whether focus traversal keys are enabled for this Component.
Font	getFont() Gets the font of this component.
FontMetrics	getFontMetrics(Font font) Gets the font metrics for the specified font.
Color	getForeground() Gets the foreground color of this component.
Graphics	getGraphics() Creates a graphics context for this component.
GraphicsConfiguration	getGraphicsConfiguration() Gets the `GraphicsConfiguration` associated with this `Component`.
int	getHeight() Returns the current height of this component.
synchronized HierarchyBoundsListener[]	getHierarchyBoundsListeners() Returns an array of all the hierarchy bounds listeners registered on this component.
synchronized HierarchyListener[]	getHierarchyListeners() Returns an array of all the hierarchy listeners registered on this component.
boolean	getIgnoreRepaint()
InputContext	getInputContext() Gets the input context used by this component for handling the communication with input methods when text is entered in this component.
synchronized InputMethodListener[]	getInputMethodListeners() Returns an array of all the input method listeners registered on this component.
InputMethodRequests	getInputMethodRequests() Gets the input method request handler which supports requests from input methods for this component.
synchronized KeyListener[]	getKeyListeners() Returns an array of all the key listeners registered on this component.
<T extends EventListener> T[]	getListeners(Class<T> listenerType) Returns an array of all the objects currently registered as `FooListener`s upon this `Component`.
Locale	getLocale() Gets the locale of this component.
Point	getLocation() Gets the location of this component in the form of a point specifying the component's top-left corner.
Point	getLocation(Point rv) Stores the x,y origin of this component into "return value" rv and return rv.
Point	getLocationOnScreen() Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space.
Dimension	getMaximumSize() Gets the maximum size of this component.
Dimension	getMinimumSize() Gets the mininimum size of this component.
synchronized MouseListener[]	getMouseListeners() Returns an array of all the mouse listeners registered on this component.
synchronized MouseMotionListener[]	getMouseMotionListeners() Returns an array of all the mouse motion listeners registered on this component.
Point	getMousePosition() Returns the position of the mouse pointer in this `Component`'s coordinate space if the `Component` is directly under the mouse pointer, otherwise returns `null`.
synchronized MouseWheelListener[]	getMouseWheelListeners() Returns an array of all the mouse wheel listeners registered on this component.
String	getName() Gets the name of the component.
Container	getParent() Gets the parent of this component.
ComponentPeer	getPeer() This method is deprecated. As of JDK version 1.1, programs should not directly manipulate peers; replaced by `boolean isDisplayable()`.
Dimension	getPreferredSize() Gets the preferred size of this component.
PropertyChangeListener[]	getPropertyChangeListeners() Returns an array of all the property change listeners registered on this component.
PropertyChangeListener[]	getPropertyChangeListeners(String propertyName) Returns an array of all the listeners which have been associated with the named property.
Dimension	getSize() Returns the size of this component in the form of a `Dimension` object.
Dimension	getSize(Dimension rv) Stores the width/height of this component into "return value" rv and return rv.
Toolkit	getToolkit() Gets the toolkit of this component.
final Object	getTreeLock() Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.
int	getWidth() Returns the current width of this component.
int	getX() Returns the current x coordinate of the components origin.
int	getY() Returns the current y coordinate of the components origin.
boolean	gotFocus(Event evt, Object what) This method is deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).
boolean	handleEvent(Event evt) This method is deprecated. As of JDK version 1.1 replaced by processEvent(AWTEvent).
boolean	hasFocus() Returns `true` if this `Component` is the focus owner.
void	hide() This method is deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.
boolean	imageUpdate(Image img, int infoflags, int x, int y, int w, int h) Repaints the component when the image has changed.
boolean	inside(int x, int y) This method is deprecated. As of JDK version 1.1, replaced by contains(int, int).
void	invalidate() Invalidates this component.
boolean	isBackgroundSet() Returns whether the background color has been explicitly set for this Component.
boolean	isCursorSet() Returns whether the cursor has been explicitly set for this Component.
boolean	isDisplayable() Determines whether this component is displayable.
boolean	isDoubleBuffered() Returns true if this component is painted to an offscreen image ("buffer") that's copied to the screen later.
boolean	isEnabled() Determines whether this component is enabled.
boolean	isFocusCycleRoot(Container container) Returns whether the specified Container is the focus cycle root of this Component's focus traversal cycle.
boolean	isFocusOwner() Returns `true` if this `Component` is the focus owner.
boolean	isFocusTraversable() This method is deprecated. As of 1.4, replaced by `isFocusable()`.
boolean	isFocusable() Returns whether this Component can be focused.
boolean	isFontSet() Returns whether the font has been explicitly set for this Component.
boolean	isForegroundSet() Returns whether the foreground color has been explicitly set for this Component.
boolean	isLightweight() A lightweight component doesn't have a native toolkit peer.
boolean	isMaximumSizeSet() Returns true if the maximum size has been set to a non-`null` value otherwise returns false.
boolean	isMinimumSizeSet() Returns whether or not `setMinimumSize` has been invoked with a non-null value.
boolean	isOpaque() Returns true if this component is completely opaque, returns false by default.
boolean	isPreferredSizeSet() Returns true if the preferred size has been set to a non-`null` value otherwise returns false.
boolean	isShowing() Determines whether this component is showing on screen.
boolean	isValid() Determines whether this component is valid.
boolean	isVisible() Determines whether this component should be visible when its parent is visible.
boolean	keyDown(Event evt, int key) This method is deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent).
boolean	keyUp(Event evt, int key) This method is deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent).
void	layout() This method is deprecated. As of JDK version 1.1, replaced by `doLayout()`.
void	list(PrintStream out) Prints a listing of this component to the specified output stream.
void	list() Prints a listing of this component to the standard system output stream `System.out`.
void	list(PrintStream out, int indent) Prints out a list, starting at the specified indentation, to the specified print stream.
void	list(PrintWriter out) Prints a listing to the specified print writer.
void	list(PrintWriter out, int indent) Prints out a list, starting at the specified indentation, to the specified print writer.
Component	locate(int x, int y) This method is deprecated. As of JDK version 1.1, replaced by getComponentAt(int, int).
Point	location() This method is deprecated. As of JDK version 1.1, replaced by `getLocation()`.
boolean	lostFocus(Event evt, Object what) This method is deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).
Dimension	minimumSize() This method is deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`.
boolean	mouseDown(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
boolean	mouseDrag(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent).
boolean	mouseEnter(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
boolean	mouseExit(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
boolean	mouseMove(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent).
boolean	mouseUp(Event evt, int x, int y) This method is deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
void	move(int x, int y) This method is deprecated. As of JDK version 1.1, replaced by `setLocation(int, int)`.
void	nextFocus() This method is deprecated. As of JDK version 1.1, replaced by transferFocus().
void	paint(Graphics g) Paints this component.
void	paintAll(Graphics g) Paints this component and all of its subcomponents.
String	paramString() Returns a string representing the state of this component.
boolean	postEvent(Event e) This method is deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent).
Dimension	preferredSize() This method is deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`.
boolean	prepareImage(Image image, ImageObserver observer) Prepares an image for rendering on this component.
boolean	prepareImage(Image image, int width, int height, ImageObserver observer) Prepares an image for rendering on this component at the specified width and height.
void	print(Graphics g) Prints this component.
void	printAll(Graphics g) Prints this component and all of its subcomponents.
void	processComponentEvent(ComponentEvent e) Processes component events occurring on this component by dispatching them to any registered `ComponentListener` objects.
void	processEvent(AWTEvent e) Processes events occurring on this component.
void	processFocusEvent(FocusEvent e) Processes focus events occurring on this component by dispatching them to any registered `FocusListener` objects.
void	processHierarchyBoundsEvent(HierarchyEvent e) Processes hierarchy bounds events occurring on this component by dispatching them to any registered `HierarchyBoundsListener` objects.
void	processHierarchyEvent(HierarchyEvent e) Processes hierarchy events occurring on this component by dispatching them to any registered `HierarchyListener` objects.
void	processInputMethodEvent(InputMethodEvent e) Processes input method events occurring on this component by dispatching them to any registered `InputMethodListener` objects.
void	processKeyEvent(KeyEvent e) Processes key events occurring on this component by dispatching them to any registered `KeyListener` objects.
void	processMouseEvent(MouseEvent e) Processes mouse events occurring on this component by dispatching them to any registered `MouseListener` objects.
void	processMouseMotionEvent(MouseEvent e) Processes mouse motion events occurring on this component by dispatching them to any registered `MouseMotionListener` objects.
void	processMouseWheelEvent(MouseWheelEvent e) Processes mouse wheel events occurring on this component by dispatching them to any registered `MouseWheelListener` objects.
void	remove(MenuComponent popup) Removes the specified popup menu from the component.
synchronized void	removeComponentListener(ComponentListener l) Removes the specified component listener so that it no longer receives component events from this component.
synchronized void	removeFocusListener(FocusListener l) Removes the specified focus listener so that it no longer receives focus events from this component.
void	removeHierarchyBoundsListener(HierarchyBoundsListener l) Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component.
void	removeHierarchyListener(HierarchyListener l) Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component.
synchronized void	removeInputMethodListener(InputMethodListener l) Removes the specified input method listener so that it no longer receives input method events from this component.
synchronized void	removeKeyListener(KeyListener l) Removes the specified key listener so that it no longer receives key events from this component.
synchronized void	removeMouseListener(MouseListener l) Removes the specified mouse listener so that it no longer receives mouse events from this component.
synchronized void	removeMouseMotionListener(MouseMotionListener l) Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component.
synchronized void	removeMouseWheelListener(MouseWheelListener l) Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component.
void	removeNotify() Makes this `Component` undisplayable by destroying it native screen resource.
void	removePropertyChangeListener(String propertyName, PropertyChangeListener listener) Removes a `PropertyChangeListener` from the listener list for a specific property.
void	removePropertyChangeListener(PropertyChangeListener listener) Removes a PropertyChangeListener from the listener list.
void	repaint(int x, int y, int width, int height) Repaints the specified rectangle of this component.
void	repaint(long tm, int x, int y, int width, int height) Repaints the specified rectangle of this component within `tm` milliseconds.
void	repaint() Repaints this component.
void	repaint(long tm) Repaints the component.
void	requestFocus() Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.
boolean	requestFocus(boolean temporary) Requests that this `Component` get the input focus, and that this `Component`'s top-level ancestor become the focused `Window`.
boolean	requestFocusInWindow(boolean temporary) Requests that this `Component` get the input focus, if this `Component`'s top-level ancestor is already the focused `Window`.
boolean	requestFocusInWindow() Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.
void	reshape(int x, int y, int width, int height) This method is deprecated. As of JDK version 1.1, replaced by `setBounds(int, int, int, int)`.
void	resize(Dimension d) This method is deprecated. As of JDK version 1.1, replaced by `setSize(Dimension)`.
void	resize(int width, int height) This method is deprecated. As of JDK version 1.1, replaced by `setSize(int, int)`.
void	setBackground(Color c) Sets the background color of this component.
void	setBounds(int x, int y, int width, int height) Moves and resizes this component.
void	setBounds(Rectangle r) Moves and resizes this component to conform to the new bounding rectangle `r`.
void	setComponentOrientation(ComponentOrientation o) Sets the language-sensitive orientation that is to be used to order the elements or text within this component.
void	setCursor(Cursor cursor) Sets the cursor image to the specified cursor.
synchronized void	setDropTarget(DropTarget dt) Associate a `DropTarget` with this component.
void	setEnabled(boolean b) Enables or disables this component, depending on the value of the parameter `b`.
void	setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes) Sets the focus traversal keys for a given traversal operation for this Component.
void	setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled) Sets whether focus traversal keys are enabled for this Component.
void	setFocusable(boolean focusable) Sets the focusable state of this Component to the specified value.
void	setFont(Font f) Sets the font of this component.
void	setForeground(Color c) Sets the foreground color of this component.
void	setIgnoreRepaint(boolean ignoreRepaint) Sets whether or not paint messages received from the operating system should be ignored.
void	setLocale(Locale l) Sets the locale of this component.
void	setLocation(int x, int y) Moves this component to a new location.
void	setLocation(Point p) Moves this component to a new location.
void	setMaximumSize(Dimension maximumSize) Sets the maximum size of this component to a constant value.
void	setMinimumSize(Dimension minimumSize) Sets the minimum size of this component to a constant value.
void	setName(String name) Sets the name of the component to the specified string.
void	setPreferredSize(Dimension preferredSize) Sets the preferred size of this component to a constant value.
void	setSize(int width, int height) Resizes this component so that it has width `width` and height `height`.
void	setSize(Dimension d) Resizes this component so that it has width `d.width` and height `d.height`.
void	setVisible(boolean b) Shows or hides this component depending on the value of parameter `b`.
void	show() This method is deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.
void	show(boolean b) This method is deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.
Dimension	size() This method is deprecated. As of JDK version 1.1, replaced by `getSize()`.
String	toString() Returns a string representation of this component and its values.
void	transferFocus() Transfers the focus to the next component, as though this Component were the focus owner.
void	transferFocusBackward() Transfers the focus to the previous component, as though this Component were the focus owner.
void	transferFocusUpCycle() Transfers the focus up one focus traversal cycle.
void	update(Graphics g) Updates this component.
void	validate() Ensures that this component has a valid layout.

From class java.lang.Object

Object	clone() Creates and returns a copy of this object.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
void	finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
final Class<?>	getClass() Returns the runtime class of this `Object`.
int	hashCode() Returns a hash code value for the object.
final void	notify() Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll() Wakes up all threads that are waiting on this object's monitor.
String	toString() Returns a string representation of the object.
final void	wait() Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
final void	wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
final void	wait(long timeout) Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.

From interface java.awt.MenuContainer

From interface java.awt.image.ImageObserver

From interface javax.accessibility.Accessible

Constants

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.

Constant Value: 5 (0x00000005)

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.

Constant Value: 4 (0x00000004)

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.

Constant Value: 6 (0x00000006)

public static final int FRAME

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

Constant Value: 1 (0x00000001)

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.

Constant Value: 3 (0x00000003)

public static final int NONE

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

Constant Value: 0 (0x00000000)

public static final int PLAIN_DIALOG

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

Constant Value: 2 (0x00000002)

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.

Constant Value: 7 (0x00000007)

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.

Constant Value: 8 (0x00000008)

Fields

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 JRootPane.DefaultAction defaultPressAction

This field is 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.

protected JRootPane.DefaultAction defaultReleaseAction

This field is 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.

protected Component glassPane

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

protected JLayeredPane layeredPane

The layered pane that manages the menu bar and content pane.

protected JMenuBar menuBar

The menu bar.

Public Constructors

public JRootPane ()

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

Public Methods

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.

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.

Returns

an AccessibleJRootPane that serves as the AccessibleContext of this JRootPane

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

public JButton getDefaultButton ()

Returns the value of the defaultButton property.

Returns

the JButton which is currently the default button

public Component getGlassPane ()

Returns the current glass pane for this JRootPane.

Returns

the current glass pane

public JMenuBar getJMenuBar ()

Returns the menu bar from the layered pane.

Returns

the JMenuBar used in the pane

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

public JMenuBar getMenuBar ()

This method is deprecated.
As of Swing version 1.0.3 replaced by getJMenuBar().

Returns the menu bar value.

Returns

the JMenuBar used in the pane

public RootPaneUI getUI ()

Returns the L&F object that renders this component.

Returns

LabelUI object

public String getUIClassID ()

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

Returns

the string "RootPaneUI"

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.

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 visiblity of the glassPane.

Returns

true if this component's children don't overlap

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.

Returns

true

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.

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 hiearchy. 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`

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

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.

Parameters

aFlag	if true, set this component to be double buffered

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`

public void setJMenuBar (JMenuBar menu)

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

Parameters

menu	the `JMenuBar` to add

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`

public void setMenuBar (JMenuBar menu)

This method is deprecated.
As of Swing version 1.0.3 replaced by setJMenuBar(JMenuBar menu).

Specifies the menu bar value.

Parameters

menu	the `JMenuBar` to add.

public void setUI (RootPaneUI ui)

Sets the L&F object that renders this component.

Parameters

ui	the `LabelUI` L&F object

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`.

public void updateUI ()

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

Protected Methods

protected void addImpl (Component comp, Object constraints, int index)

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

Parameters

comp	the component to be enhanced
constraints	the constraints to be respected
index	the index

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

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

protected JLayeredPane createLayeredPane ()

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

Returns

the default layeredPane

protected LayoutManager createRootLayout ()

Called by the constructor methods to create the default layoutManager.

Returns

the default layoutManager.

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.

Returns

a string representation of this JRootPane.

Interfaces

Classes

Enums

Exceptions

JRootPane

Class Overview

See Also

Summary

Constants

public static final int COLOR_CHOOSER_DIALOG

public static final int ERROR_DIALOG

public static final int FILE_CHOOSER_DIALOG

public static final int FRAME

public static final int INFORMATION_DIALOG

public static final int NONE

public static final int PLAIN_DIALOG

public static final int QUESTION_DIALOG

public static final int WARNING_DIALOG

Fields

protected Container contentPane

protected JButton defaultButton

protected JRootPane.DefaultAction defaultPressAction

See Also

protected JRootPane.DefaultAction defaultReleaseAction

See Also

protected Component glassPane

protected JLayeredPane layeredPane

protected JMenuBar menuBar

Public Constructors

public JRootPane ()

Public Methods

public void addNotify ()

public AccessibleContext getAccessibleContext ()

Returns

public Container getContentPane ()

Returns

public JButton getDefaultButton ()

Returns

See Also

public Component getGlassPane ()

Returns

See Also

public JMenuBar getJMenuBar ()

Returns

public JLayeredPane getLayeredPane ()

Returns

public JMenuBar getMenuBar ()

Returns

public RootPaneUI getUI ()

Returns

public String getUIClassID ()

Returns

See Also

public int getWindowDecorationStyle ()

Returns

See Also

public boolean isOptimizedDrawingEnabled ()

Returns

public boolean isValidateRoot ()

Returns

See Also

public void removeNotify ()

public void setContentPane (Container content)

Parameters

Throws

public void setDefaultButton (JButton defaultButton)

Parameters

See Also

public void setDoubleBuffered (boolean aFlag)

Parameters

public void setGlassPane (Component glass)

Parameters

Throws

public void setJMenuBar (JMenuBar menu)

Parameters

public void setLayeredPane (JLayeredPane layered)

Parameters

Throws

public void setMenuBar (JMenuBar menu)

Parameters