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javax.swing
Class JWindow

java.lang.Object
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  +--java.awt.Component
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        +--java.awt.Container
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              +--java.awt.Window
                    |
                    +--javax.swing.JWindow

public class JWindow

extends Window

implements Accessible, RootPaneContainer

A JWindow is a container that can be displayed anywhere on the user's desktop. It does not have the title bar, window-management buttons, or other trimmings associated with a JFrame, but it is still a "first-class citizen" of the user's desktop, and can exist anywhere on it.

The JWindow component contains a JRootPane as it's only child. The contentPane() should be the parent of any children of the JWindow. From the older java.awt.Window object you would normally do something like this:

       window.add(child);
 

However, using JWindow you would code:

       window.getContentPane().add(child);
 

The same is true of setting LayoutManagers, removing components, listing children, etc. All these methods should normally be sent to the contentPane() instead of the JWindow itself. The contentPane() will always be non-null. Attempting to set it to null will cause the JWindow to throw an exception. The default contentPane() will have a BorderLayout manager set on it.

Please see the JRootPane documentation for a complete description of the contentPane(), glassPane(), and layeredPane() components.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JWindow key assignments.

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. A future release of Swing will provide support for long term persistence.

See Also:

JRootPane, Serialized Form

Inner Class Summary

protected class

JWindow.AccessibleJWindow The class used to obtain the AccessibleRole for this object.

Field Summary

protected AccessibleContext	accessibleContext The accessible context property
protected JRootPane	rootPane The JRootPane instance that manages the contentPane and optional menuBar for this frame, as well as the glassPane.
protected boolean	rootPaneCheckingEnabled If true then calls to add and setLayout cause an exception to be thrown.

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

JWindow()
Creates a window with no specified owner.

JWindow(Frame owner)
Creates a window with the specified owner frame.

JWindow(Window owner)
Creates a window with the specified owner window.

Method Summary

protected void	addImpl(Component comp, Object constraints, int index) By default, children may not be added directly to a this component, they must be added to its contentPane instead.
protected JRootPane	createRootPane() Called by the constructor methods to create the default rootPane.
AccessibleContext	getAccessibleContext() Get the AccessibleContext associated with this JWindow
Container	getContentPane() Returns the contentPane object for this window.
Component	getGlassPane() Returns the glassPane object for this window.
JLayeredPane	getLayeredPane() Returns the layeredPane object for this window.
JRootPane	getRootPane() Returns the rootPane object for this window.
protected boolean	isRootPaneCheckingEnabled() Returns whether calls to add and setLayout cause an exception to be thrown.
protected String	paramString() Returns a string representation of this JWindow.
void	remove(Component comp) Removes the specified component from this container.
void	setContentPane(Container contentPane) Sets the contentPane property.
void	setGlassPane(Component glassPane) Sets the glassPane property.
void	setLayeredPane(JLayeredPane layeredPane) Sets the layeredPane property.
void	setLayout(LayoutManager manager) By default the layout of this component may not be set, the layout of its contentPane should be set instead.
protected void	setRootPane(JRootPane root) Sets the rootPane property.
protected void	setRootPaneCheckingEnabled(boolean enabled) Determines whether calls to add and setLayout cause an exception to be thrown.
protected void	windowInit() Called by the constructors to init the JWindow properly.

Methods inherited from class java.awt.Window

addNotify, addWindowListener, applyResourceBundle, applyResourceBundle, dispose, finalize, getFocusOwner, getInputContext, getLocale, getOwnedWindows, getOwner, getToolkit, getWarningString, hide, isShowing, pack, postEvent, processEvent, processWindowEvent, removeWindowListener, setCursor, show, toBack, toFront

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, removeNotify, setFont, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

rootPane

protected JRootPane rootPane

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

See Also:

getRootPane(), setRootPane(javax.swing.JRootPane)

rootPaneCheckingEnabled

protected boolean rootPaneCheckingEnabled

If true then calls to add and setLayout cause an exception to be thrown.

See Also:

isRootPaneCheckingEnabled(), setRootPaneCheckingEnabled(boolean)

accessibleContext

protected AccessibleContext accessibleContext

The accessible context property

Constructor Detail

JWindow

public JWindow()

Creates a window with no specified owner.

JWindow

public JWindow(Frame owner)

Creates a window with the specified owner frame.

Parameters:

owner - the frame from which the window is displayed

JWindow

public JWindow(Window owner)

Creates a window with the specified owner window.

Parameters:

owner - the window from which the window is displayed

Method Detail

windowInit

protected void windowInit()

Called by the constructors to init the JWindow properly.

createRootPane

protected JRootPane createRootPane()

Called by the constructor methods to create the default rootPane.

isRootPaneCheckingEnabled

protected boolean isRootPaneCheckingEnabled()

Returns whether calls to add and setLayout cause an exception to be thrown.

Returns:

true if add and setLayout are checked

See Also:

addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), setRootPaneCheckingEnabled(boolean)

setRootPaneCheckingEnabled

protected void setRootPaneCheckingEnabled(boolean enabled)

Determines whether calls to add and setLayout cause an exception to be thrown.

Parameters:

enabled - a boolean value, true if checking is to be enabled, which cause the exceptions to be thrown

See Also:

addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), isRootPaneCheckingEnabled()

addImpl

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

By default, children may not be added directly to a this component, they must be added to its contentPane instead. For example:

 thisComponent.getContentPane().add(child)
 

An attempt to add to directly to this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

Overrides:

addImpl in class Container

Throws:

Error - if called with rootPaneChecking true

See Also:

setRootPaneCheckingEnabled(boolean)

remove

public void remove(Component comp)

Removes the specified component from this container.

Overrides:

remove in class Container

Parameters:

comp - the component to be removed

See Also:

Container.add(java.awt.Component)

setLayout

public void setLayout(LayoutManager manager)

By default the layout of this component may not be set, the layout of its contentPane should be set instead. For example:

 thisComponent.getContentPane().setLayout(new BorderLayout())
 

An attempt to set the layout of this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

Overrides:

setLayout in class Container

Throws:

Error - if called with rootPaneChecking true

See Also:

setRootPaneCheckingEnabled(boolean)

getRootPane

public JRootPane getRootPane()

Returns the rootPane object for this window.

Specified by:

getRootPane in interface RootPaneContainer

See Also:

setRootPane(javax.swing.JRootPane), RootPaneContainer.getRootPane()

setRootPane

protected void setRootPane(JRootPane root)

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

Parameters:

root - the rootPane object for this window

See Also:

getRootPane()

getContentPane

public Container getContentPane()

Returns the contentPane object for this window.

Specified by:

getContentPane in interface RootPaneContainer

Returns:

the Container which is the contentPane

See Also:

setContentPane(java.awt.Container), RootPaneContainer.getContentPane()

setContentPane

public void setContentPane(Container contentPane)

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

Specified by:

setContentPane in interface RootPaneContainer

Parameters:

contentPane - the contentPane object for this window

Throws:

IllegalComponentStateException - (a runtime exception) if the content pane parameter is null

See Also:

getContentPane(), RootPaneContainer.setContentPane(java.awt.Container)

getLayeredPane

public JLayeredPane getLayeredPane()

Returns the layeredPane object for this window.

Specified by:

getLayeredPane in interface RootPaneContainer

Returns:

the JLayeredPane object

See Also:

setLayeredPane(javax.swing.JLayeredPane), RootPaneContainer.getLayeredPane()

setLayeredPane

public void setLayeredPane(JLayeredPane layeredPane)

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

Specified by:

setLayeredPane in interface RootPaneContainer

Parameters:

layeredPane - the layeredPane object for this window

Throws:

IllegalComponentStateException - (a runtime exception) if the content pane parameter is null

See Also:

getLayeredPane(), RootPaneContainer.setLayeredPane(javax.swing.JLayeredPane)

getGlassPane

public Component getGlassPane()

Returns the glassPane object for this window.

Specified by:

getGlassPane in interface RootPaneContainer

Returns:

the Component which is the glassPane

See Also:

setGlassPane(java.awt.Component), RootPaneContainer.getGlassPane()

setGlassPane

public void setGlassPane(Component glassPane)

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

Specified by:

setGlassPane in interface RootPaneContainer

Parameters:

glassPane - the glassPane object for this window

See Also:

getGlassPane(), RootPaneContainer.setGlassPane(java.awt.Component)

paramString

protected String paramString()

Returns a string representation of this JWindow. 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 Container

Returns:

a string representation of this JWindow.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext associated with this JWindow

Specified by:

getAccessibleContext in interface Accessible

Returns:

the AccessibleContext of this JWindow