Module java.desktop

Package javax.swing

Class JWindow

java.lang.Object

java.awt.Component

java.awt.Container

java.awt.Window

javax.swing.JWindow

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible, RootPaneContainer

@JavaBean(defaultProperty="accessibleContext",
          description="A toplevel window which has no system border or controls.")
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 its only child. The contentPane should be the parent of any children of the JWindow. As a convenience, the add, remove, and setLayout methods of this class are overridden, so that they delegate calls to the corresponding methods of the ContentPane. For example, you can add a child component to a window as follows:

       window.add(child);
 

And the child will be added to the contentPane. 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. Refer to RootPaneContainer for details on adding, removing and setting the LayoutManager of a JWindow.

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.

Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

Since:

1.2

See Also:

• JRootPane

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	JWindow.AccessibleJWindow	This class implements accessibility support for the JWindow class.

Nested classes/interfaces declared in class java.awt.Window

Window.AccessibleAWTWindow, Window.Type

Nested classes/interfaces declared in class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces declared in class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields

Modifier and Type	Field	Description
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 be forwarded to the contentPane.

Fields declared in class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields declared in interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor	Description
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 specified owner window.
JWindow(Window owner, GraphicsConfiguration gc)	Creates a window with the specified owner window and GraphicsConfiguration of a screen device.

Method Summary

Modifier and Type	Method	Description
protected void	addImpl(Component comp, Object constraints, int index)	Adds the specified child Component.
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.
Graphics	getGraphics()	Creates a graphics context for this component.
JLayeredPane	getLayeredPane()	Returns the layeredPane object for this window.
JRootPane	getRootPane()	Returns the rootPane object for this window.
TransferHandler	getTransferHandler()	Gets the transferHandler property.
protected boolean	isRootPaneCheckingEnabled()	Returns whether calls to add and setLayout are forwarded to the contentPane.
protected String	paramString()	Returns a string representation of this JWindow.
void	remove(Component comp)	Removes the specified component from the container.
void	repaint(long time, int x, int y, int width, int height)	Repaints the specified rectangle of this component within time milliseconds.
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)	Sets the LayoutManager.
protected void	setRootPane(JRootPane root)	Sets the new rootPane object for this window.
protected void	setRootPaneCheckingEnabled(boolean enabled)	Sets whether calls to add and setLayout are forwarded to the contentPane.
void	setTransferHandler(TransferHandler newHandler)	Sets the transferHandler property, which is a mechanism to support transfer of data into this component.
void	update(Graphics g)	Calls paint(g).
protected void	windowInit()	Called by the constructors to init the JWindow properly.

Methods declared in class java.awt.Window

addNotify, addPropertyChangeListener, addPropertyChangeListener, addWindowFocusListener, addWindowListener, addWindowStateListener, applyResourceBundle, applyResourceBundle, createBufferStrategy, createBufferStrategy, dispose, getBackground, getBufferStrategy, getFocusableWindowState, getFocusCycleRootAncestor, getFocusOwner, getFocusTraversalKeys, getIconImages, getInputContext, getListeners, getLocale, getModalExclusionType, getMostRecentFocusOwner, getOpacity, getOwnedWindows, getOwner, getOwnerlessWindows, getShape, getToolkit, getType, getWarningString, getWindowFocusListeners, getWindowListeners, getWindows, getWindowStateListeners, hide, isActive, isAlwaysOnTop, isAlwaysOnTopSupported, isAutoRequestFocus, isFocusableWindow, isFocusCycleRoot, isFocused, isLocationByPlatform, isOpaque, isShowing, isValidateRoot, pack, paint, postEvent, processEvent, processWindowEvent, processWindowFocusEvent, processWindowStateEvent, removeWindowFocusListener, removeWindowListener, removeWindowStateListener, reshape, setAlwaysOnTop, setAutoRequestFocus, setBackground, setBounds, setBounds, setCursor, setFocusableWindowState, setFocusCycleRoot, setIconImage, setIconImages, setLocation, setLocation, setLocationByPlatform, setLocationRelativeTo, setMinimumSize, setModalExclusionType, setOpacity, setShape, setSize, setSize, setType, setVisible, show, toBack, toFront

Methods declared in class java.awt.Container

add, add, add, add, add, addContainerListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusDownCycle, validate, validateTree

Methods declared in class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, 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, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, resize, resize, revalidate, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setMaximumSize, setMixingCutoutShape, setName, setPreferredSize, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods declared in class java.lang.Object

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

Field Details

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 be forwarded to the contentPane. This is initially false, but is set to true when the JWindow is constructed.

See Also:

• isRootPaneCheckingEnabled()
• setRootPaneCheckingEnabled(boolean)
• RootPaneContainer

accessibleContext

protected AccessibleContext accessibleContext

The accessible context property.

Constructor Details

JWindow

public JWindow()

Creates a window with no specified owner. This window will not be focusable.

This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

See Also:

• GraphicsEnvironment.isHeadless()
• Window.isFocusableWindow()
• JComponent.getDefaultLocale()

JWindow

public JWindow(GraphicsConfiguration gc)

Creates a window with the specified GraphicsConfiguration of a screen device. This window will not be focusable.

This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

Parameters:

gc - the GraphicsConfiguration that is used to construct the new window with; if gc is null, the system default GraphicsConfiguration is assumed

Throws:

HeadlessException - If GraphicsEnvironment.isHeadless() returns true.

IllegalArgumentException - if gc is not from a screen device.

Since:

1.3

See Also:

• GraphicsEnvironment.isHeadless()
• Window.isFocusableWindow()
• JComponent.getDefaultLocale()

JWindow

public JWindow(Frame owner)

Creates a window with the specified owner frame. If owner is null, the shared owner will be used and this window will not be focusable. Also, this window will not be focusable unless its owner is showing on the screen.

This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

Parameters:

owner - the frame from which the window is displayed

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

See Also:

• GraphicsEnvironment.isHeadless()
• Window.isFocusableWindow()
• JComponent.getDefaultLocale()

JWindow

public JWindow(Window owner)

Creates a window with the specified owner window. This window will not be focusable unless its owner is showing on the screen. If owner is null, the shared owner will be used and this window will not be focusable.

This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

Parameters:

owner - the window from which the window is displayed

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

See Also:

• GraphicsEnvironment.isHeadless()
• Window.isFocusableWindow()
• JComponent.getDefaultLocale()

JWindow

public JWindow(Window owner,
 GraphicsConfiguration gc)

Creates a window with the specified owner window and GraphicsConfiguration of a screen device. If owner is null, the shared owner will be used and this window will not be focusable.

This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

Parameters:

owner - the window from which the window is displayed

gc - the GraphicsConfiguration that is used to construct the new window with; if gc is null, the system default GraphicsConfiguration is assumed, unless owner is also null, in which case the GraphicsConfiguration from the shared owner frame will be used.

Throws:

HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

IllegalArgumentException - if gc is not from a screen device.

Since:

1.3

See Also:

• GraphicsEnvironment.isHeadless()
• Window.isFocusableWindow()
• JComponent.getDefaultLocale()

Method Details

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.

Returns:

a new JRootPane

isRootPaneCheckingEnabled

protected boolean isRootPaneCheckingEnabled()

Returns whether calls to add and setLayout are forwarded to the contentPane.

Returns:

true if add and setLayout are forwarded; false otherwise

See Also:

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

setTransferHandler

@BeanProperty(hidden=true,
              description="Mechanism for transfer of data into the component")
public void setTransferHandler(TransferHandler newHandler)

Sets the transferHandler property, which is a mechanism to support transfer of data into this component. Use null if the component does not support data transfer operations.

If the system property suppressSwingDropSupport is false (the default) and the current drop target on this component is either null or not a user-set drop target, this method will change the drop target as follows: If newHandler is null it will clear the drop target. If not null it will install a new DropTarget.

Note: When used with JWindow, TransferHandler only provides data import capability, as the data export related methods are currently typed to JComponent.

Please see How to Use Drag and Drop and Data Transfer, a section in The Java Tutorial, for more information.

Parameters:

newHandler - the new TransferHandler

Since:

1.6

See Also:

• TransferHandler
• getTransferHandler()
• Component.setDropTarget(java.awt.dnd.DropTarget)

getTransferHandler

public TransferHandler getTransferHandler()

Gets the transferHandler property.

Returns:

the value of the transferHandler property

Since:

1.6

See Also:

• TransferHandler
• setTransferHandler(javax.swing.TransferHandler)

update

public void update(Graphics g)

Calls paint(g). This method was overridden to prevent an unnecessary call to clear the background.

Overrides:

update in class Container

Parameters:

g - the Graphics context in which to paint

See Also:

• Component.update(Graphics)

setRootPaneCheckingEnabled

@BeanProperty(hidden=true,
              description="Whether the add and setLayout methods are forwarded")
protected void setRootPaneCheckingEnabled(boolean enabled)

Sets whether calls to add and setLayout are forwarded to the contentPane.

Parameters:

enabled - true if add and setLayout are forwarded, false if they should operate directly on the JWindow.

See Also:

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

addImpl

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

Adds the specified child Component. This method is overridden to conditionally forward calls to the contentPane. By default, children are added to the contentPane instead of the frame, refer to RootPaneContainer for details.

Overrides:

addImpl in class Container

Parameters:

comp - the component to be enhanced

constraints - the constraints to be respected

index - the index

Throws:

IllegalArgumentException - if index is invalid

IllegalArgumentException - if adding the container's parent to itself

IllegalArgumentException - if adding a window to a container

See Also:

• setRootPaneCheckingEnabled(boolean)
• RootPaneContainer

remove

public void remove(Component comp)

Removes the specified component from the container. If comp is not the rootPane, this will forward the call to the contentPane. This will do nothing if comp is not a child of the JWindow or contentPane.

Overrides:

remove in class Container

Parameters:

comp - the component to be removed

Throws:

NullPointerException - if comp is null

See Also:

• Container.add(java.awt.Component)
• RootPaneContainer

setLayout

public void setLayout(LayoutManager manager)

Sets the LayoutManager. Overridden to conditionally forward the call to the contentPane. Refer to RootPaneContainer for more information.

Overrides:

setLayout in class Container

Parameters:

manager - the LayoutManager

See Also:

• setRootPaneCheckingEnabled(boolean)
• RootPaneContainer

getRootPane

@BeanProperty(bound=false,
              hidden=true,
              description="the RootPane object for this window.")
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

@BeanProperty(bound=false,
              hidden=true,
              description="The client area of the window where child components are normally inserted.")
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

@BeanProperty(bound=false,
              hidden=true,
              description="The pane which holds the various window layers.")
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

@BeanProperty(bound=false,
              hidden=true,
              description="A transparent pane used for menu rendering.")
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)

getGraphics

@BeanProperty(bound=false)
public Graphics getGraphics()

Creates a graphics context for this component. This method will return null if this component is currently not displayable.

Overrides:

getGraphics in class Component

Returns:

a graphics context for this component, or null if it has none

Since:

1.6

See Also:

• Component.paint(java.awt.Graphics)

repaint

public void repaint(long time,
 int x,
 int y,
 int width,
 int height)

Repaints the specified rectangle of this component within time milliseconds. Refer to RepaintManager for details on how the repaint is handled.

Overrides:

repaint in class Component

Parameters:

time - maximum time in milliseconds before update

x - the x coordinate

y - the y coordinate

width - the width

height - the height

Since:

1.6

See Also:

• RepaintManager

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