JavaTM 2 Platform
Std. Ed. v1.3.1

javax.swing
Class JWindow

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--javax.swing.JWindow
All Implemented Interfaces:
Accessible, ImageObserver, MenuContainer, RootPaneContainer, Serializable

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.

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

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
          This class implements accessibility support for the JWindow class.
 
Inner classes inherited from class java.awt.Window
Window.AccessibleAWTWindow
 
Inner classes inherited from class java.awt.Container
Container.AccessibleAWTContainer
 
Inner classes inherited from class java.awt.Component
Component.AccessibleAWTComponent
 
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 will cause an exception to be thrown.
 
Fields inherited from class java.awt.Component
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
JWindow()
          Creates a window with no specified owner.
JWindow(Frame owner)
          Creates a window with the specified owner frame.
JWindow(GraphicsConfiguration gc)
          Creates a window with the specified GraphicsConfiguration of a screen device.
JWindow(Window owner)
          Creates a window with the owner and the specified GraphicsConfiguration of a screen device.
JWindow(Window owner, GraphicsConfiguration gc)
           
 
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()
          Gets the AccessibleContext associated with this JWindow.
 Container getContentPane()
          Returns the Container which is the contentPane for this window.
 Component getGlassPane()
          Returns the glassPane Component 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 will 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 for this window.
 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 new rootPane object for this window.
protected  void setRootPaneCheckingEnabled(boolean enabled)
          Determines whether calls to add and setLayout will 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, getGraphicsConfiguration, getInputContext, getListeners, 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, addHierarchyBoundsListener, addHierarchyListener, 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, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, 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 will 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(GraphicsConfiguration gc)
Creates a window with the specified GraphicsConfiguration of a screen device.
Parameters:
gc - the GraphicsConfiguration that is used to construct the new window with; if gc is null, the system default GraphicsConfiguration is assumed
Throws:
IllegalArgumentException - if gc is not from a screen device.
Since:
1.3

JWindow

public JWindow(Frame owner)
Creates a window with the specified owner frame. If owner is null, the shared owner will be used.
Parameters:
owner - the frame from which the window is displayed

JWindow

public JWindow(Window owner)
Creates a window with the owner and the specified GraphicsConfiguration of a screen device.
Parameters:
owner - the window to act as owner
gc - the GraphicsConfiguration that is used to construct the new Window; if gc is null, the system default GraphicsConfiguration is assumed
Throws:
IllegalArgumentException - if gc is not from a screen device.
IllegalArgumentException - if owner is null
Since:
1.3

JWindow

public JWindow(Window owner,
               GraphicsConfiguration gc)
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 will 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 will 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
Parameters:
comp - the component to be enhanced
constraints - the constraints to be enforced on the component
index - the index of the component
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
Parameters:
manager - the layout manager for the window
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
Returns:
the rootPane property for this window
See Also:
setRootPane(javax.swing.JRootPane), RootPaneContainer.getRootPane()

setRootPane

protected void setRootPane(JRootPane root)
Sets the new rootPane object for this window. This method is called by the constructor.
Parameters:
root - the new rootPane property
See Also:
getRootPane()

getContentPane

public Container getContentPane()
Returns the Container which is the contentPane for this window.
Specified by:
getContentPane in interface RootPaneContainer
Returns:
the contentPane property
See Also:
setContentPane(java.awt.Container), RootPaneContainer.getContentPane()

setContentPane

public void setContentPane(Container contentPane)
Sets the contentPane property for this window. This method is called by the constructor.
Specified by:
setContentPane in interface RootPaneContainer
Parameters:
contentPane - the new contentPane
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 layeredPane property
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 new layeredPane object
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 Component for this window.
Specified by:
getGlassPane in interface RootPaneContainer
Returns:
the glassPane property
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()
Gets the AccessibleContext associated with this JWindow. For JWindows, the AccessibleContext takes the form of an AccessibleJWindow. A new AccessibleJWindow instance is created if necessary.
Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class Window
Returns:
an AccessibleJWindow that serves as the AccessibleContext of this JWindow

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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