Window (Java 2 Platform SE v1.4.1_"07")

Overview | Package | Class | Use | Tree | Deprecated | Index | Help

JavaTM 2 Platform
Std. Ed. v1.4.1_"07"

PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.awt
Class Window

    java.lang.Object
      |
      +--java.awt.Component
            |
            +--java.awt.Container
                  |
                  +--java.awt.Window

All Implemented Interfaces:
  Accessible, ImageObserver, MenuContainer, Serializable

Direct Known Subclasses:
  BasicToolBarUI.DragWindow, Dialog, Frame, JWindow

public class Window
extends Container
implements Accessible

A `Window` object is a top-level window with no borders and no menubar. The default layout for a window is `BorderLayout`.

A window must have either a frame, dialog, or another window defined as its owner when it's constructed.

In a multi-screen environment, you can create a `Window` on a different screen device by constructing the `Window` with `Window(Window, GraphicsConfiguration)`. The `GraphicsConfiguration` object is one of the `GraphicsConfiguration` objects of the target screen device.

In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, the bounds of all configurations are relative to the virtual device coordinate system. The origin of the virtual-coordinate system is at the upper left-hand corner of the primary physical screen. Depending on the location of the primary screen in the virtual device, negative coordinates are possible, as shown in the following figure.

In such an environment, when calling `setLocation`, you must pass a virtual coordinate to this method. Similarly, calling `getLocationOnScreen` on a `Window` returns virtual device coordinates. Call the `getBounds` method of a `GraphicsConfiguration` to find its origin in the virtual coordinate system.

The following code sets the location of a `Window` at (10, 10) relative to the origin of the physical screen of the corresponding `GraphicsConfiguration`. If the bounds of the `GraphicsConfiguration` is not taken into account, the `Window` location would be set at (10, 10) relative to the virtual-coordinate system and would appear on the primary physical screen, which might be different from the physical screen of the specified `GraphicsConfiguration`.

    	Window w = new Window(Window owner, GraphicsConfiguration gc);
    	Rectangle bounds = gc.getBounds();
    	w.setLocation(10 + bounds.x, 10 + bounds.y);

Windows are capable of generating the following WindowEvents: WindowOpened, WindowClosed, WindowGainedFocus, WindowLostFocus.

Since:
  JDK1.0
See Also:
  `WindowEvent`, `addWindowListener(java.awt.event.WindowListener)`, `BorderLayout`, Serialized Form

Nested Class Summary
`protected class` | `Window.AccessibleAWTWindow` This class implements accessibility support for the `Window` class.

Nested classes inherited from class java.awt.Container
``

Nested classes inherited from class java.awt.Component
`Component.BltBufferStrategy, Component.FlipBufferStrategy`

Field Summary

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
`Window(Frame owner)` Constructs a new invisible window with the specified `Frame` as its owner.
`Window(Window owner)` Constructs a new invisible window with the specified `Window` as its owner.
`Window(Window owner, GraphicsConfiguration gc)` Constructs a new invisible window with the specified window as its owner and a `GraphicsConfiguration` of a screen device.

Method Summary
`void` | `addNotify()` Makes this Window displayable by creating the connection to its native screen resource.
`void` | `addPropertyChangeListener(PropertyChangeListener listener)` Adds a PropertyChangeListener to the listener list.
`void` | `addPropertyChangeListener(String propertyName, PropertyChangeListener listener)` Adds a PropertyChangeListener to the listener list for a specific property.
`void` | `addWindowFocusListener(WindowFocusListener l)` Adds the specified window focus listener to receive window events from this window.
`void` | `addWindowListener(WindowListener l)` Adds the specified window listener to receive window events from this window.
`void` | `addWindowStateListener(WindowStateListener l)` Adds the specified window state listener to receive window events from this window.
`void` | `applyResourceBundle(ResourceBundle rb)` Deprecated. As of J2SE 1.4, replaced by `Component.applyComponentOrientation`.
`void` | `applyResourceBundle(String rbName)` Deprecated. As of J2SE 1.4, replaced by `Component.applyComponentOrientation`.
`void` | `createBufferStrategy(int numBuffers)` Creates a new strategy for multi-buffering on this component.
`void` | `createBufferStrategy(int numBuffers, BufferCapabilities caps)` Creates a new strategy for multi-buffering on this component with the required buffer capabilities.
`void` | `dispose()` Releases all of the native screen resources used by this Window, its subcomponents, and all of its owned children.
`protected void` | `finalize()` Disposes of the input methods and context, and removes the WeakReference which formerly pointed to this Window from the parent's owned Window list.
`AccessibleContext` | `getAccessibleContext()` Gets the AccessibleContext associated with this Window.
`BufferStrategy` | `getBufferStrategy()`
`boolean` | `getFocusableWindowState()` Returns whether this Window can become the focused Window if it meets the other requirements outlined in `isFocusableWindow`.
`Container` | `getFocusCycleRootAncestor()` Always returns `null` because Windows have no ancestors; they represent the top of the Component hierarchy.
`Component` | `getFocusOwner()` Returns the child Component of this Window that has focus if this Window is focused; returns null otherwise.
`Set` | `getFocusTraversalKeys(int id)` Gets a focus traversal key for this Window.
`GraphicsConfiguration` | `getGraphicsConfiguration()` This method returns the GraphicsConfiguration used by this Window.
`InputContext` | `getInputContext()` Gets the input context for this window.
`EventListener[]` | `getListeners(Class listenerType)` Returns an array of all the objects currently registered as `FooListener`s upon this `Window`.
`Locale` | `getLocale()` Gets the `Locale` object that is associated with this window, if the locale has been set.
`Component` | `getMostRecentFocusOwner()` Returns the child Component of this Window that will receive the focus when this Window is focused.
`Window[]` | `getOwnedWindows()` Return an array containing all the windows this window currently owns.
`Window` | `getOwner()` Returns the owner of this window.
`Toolkit` | `getToolkit()` Returns the toolkit of this frame.
`String` | `getWarningString()` Gets the warning string that is displayed with this window.
`WindowFocusListener[]` | `getWindowFocusListeners()` Returns an array of all the window focus listeners registered on this window.
`WindowListener[]` | `getWindowListeners()` Returns an array of all the window listeners registered on this window.
`WindowStateListener[]` | `getWindowStateListeners()` Returns an array of all the window state listeners registered on this window.
`void` | `hide()` Hide this Window, its subcomponents, and all of its owned children.
`boolean` | `isActive()` Returns whether this Window is active.
`boolean` | `isFocusableWindow()` Returns whether this Window can become the focused Window, that is, whether this Window or any of its subcomponents can become the focus owner.
`boolean` | `isFocusCycleRoot()` Always returns `true` because all Windows must be roots of a focus traversal cycle.
`boolean` | `isFocused()` Returns whether this Window is focused.
`boolean` | `isShowing()` Checks if this Window is showing on screen.
`void` | `pack()` Causes this Window to be sized to fit the preferred size and layouts of its subcomponents.
`boolean` | `postEvent(Event e)` Deprecated. As of JDK version 1.1 replaced by `dispatchEvent(AWTEvent)`.
`protected void` | `processEvent(AWTEvent e)` Processes events on this window.
`protected void` | `processWindowEvent(WindowEvent e)` Processes window events occurring on this window by dispatching them to any registered WindowListener objects.
`protected void` | `processWindowFocusEvent(WindowEvent e)` Processes window focus event occuring on this window by dispatching them to any registered WindowFocusListener objects.
`protected void` | `processWindowStateEvent(WindowEvent e)` Processes window state event occuring on this window by dispatching them to any registered `WindowStateListener` objects.
`void` | `removeWindowFocusListener(WindowFocusListener l)` Removes the specified window focus listener so that it no longer receives window events from this window.
`void` | `removeWindowListener(WindowListener l)` Removes the specified window listener so that it no longer receives window events from this window.
`void` | `removeWindowStateListener(WindowStateListener l)` Removes the specified window state listener so that it no longer receives window events from this window.
`void` | `setCursor(Cursor cursor)` Set the cursor image to a specified cursor.
`void` | `setFocusableWindowState(boolean focusableWindowState)` Sets whether this Window can become the focused Window if it meets the other requirements outlined in `isFocusableWindow`.
`void` | `setFocusCycleRoot(boolean focusCycleRoot)` Does nothing because Windows must always be roots of a focus traversal cycle.
`void` | `setLocationRelativeTo(Component c)` Sets the location of the window relative to the specified component.
`void` | `show()` Makes the Window visible.
`void` | `toBack()` If this Window is visible, sends this Window to the back and may cause it to lose focus or activation if it is the focused or active Window.
`void` | `toFront()` If this Window is visible, brings this Window to the front and may make it the focused Window.

Methods inherited from class java.awt.Container
`add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFocusTraversalKeys, setFocusTraversalPolicy, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, update, validate, validateTree`

Methods inherited from class java.awt.Component
`action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, 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, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus, transferFocusUpCycle`

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

Constructor Detail

### Window

    public Window(Frame owner)

  Constructs a new invisible window with the specified `Frame` as its owner. The Window will not be focusable unless its owner is showing on the screen.

  If there is a security manager, this method first calls the security manager's `checkTopLevelWindow` method with `this` as its argument to determine whether or not the window must be displayed with a warning banner.

Parameters:
  `owner` - the `Frame` to act as owner
Throws:
  `IllegalArgumentException` - if the `owner`'s `GraphicsConfiguration` is not from a screen device
  `IllegalArgumentException` - if `owner` is `null`; this exception is always thrown when `GraphicsEnvironment.isHeadless` returns true
See Also:
  `GraphicsEnvironment.isHeadless()`, `SecurityManager.checkTopLevelWindow(java.lang.Object)`, `isShowing()`

### Window

    public Window(Window owner)

  Constructs a new invisible window with the specified `Window` as its owner. The Window will not be focusable unless its nearest owning Frame or Dialog is showing on the screen.

  If there is a security manager, this method first calls the security manager's `checkTopLevelWindow` method with `this` as its argument to determine whether or not the window must be displayed with a warning banner.

Parameters:
  `owner` - the `Window` to act as owner
Throws:
  `IllegalArgumentException` - if the `owner`'s `GraphicsConfiguration` is not from a screen device
  `IllegalArgumentException` - if `owner` is `null`. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true.
Since:
  1.2
See Also:
  `GraphicsEnvironment.isHeadless()`, `SecurityManager.checkTopLevelWindow(java.lang.Object)`, `isShowing()`

### Window

    public Window(Window owner,
                  GraphicsConfiguration gc)

  Constructs a new invisible window with the specified window as its owner and a `GraphicsConfiguration` of a screen device. The Window will not be focusable unless its nearest owning Frame or Dialog is showing on the screen.

  If there is a security manager, this method first calls the security manager's `checkTopLevelWindow` method with `this` as its argument to determine whether or not the window must be displayed with a warning banner.

Parameters:
  `owner` - the window to act as owner
  `gc` - the `GraphicsConfiguration` of the target screen device; if `gc` is `null`, the system default `GraphicsConfiguration` is assumed
Throws:
  `IllegalArgumentException` - if `owner` is `null`
  `IllegalArgumentException` - if `gc` is not from a screen device; this exception is always thrown when `GraphicsEnvironment.isHeadless` returns `true`
Since:
  1.3
See Also:
  `GraphicsEnvironment.isHeadless()`, `SecurityManager.checkTopLevelWindow(java.lang.Object)`, `GraphicsConfiguration.getBounds()`, `isShowing()`

Method Detail

### finalize

    protected void finalize()
                     throws Throwable

  Disposes of the input methods and context, and removes the WeakReference which formerly pointed to this Window from the parent's owned Window list.

  Overrides:
    `finalize` in class `Object`
  Throws:
    `Throwable` - the `Exception` raised by this method

### addNotify

    public void addNotify()

  Makes this Window displayable by creating the connection to its native screen resource. This method is called internally by the toolkit and should not be called directly by programs.

  Overrides:
    `addNotify` in class `Container`
  Since:
    JDK1.0
  See Also:
    `Component.isDisplayable()`, `Container.removeNotify()`

### pack

    public void pack()

  Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. If the window and/or its owner are not yet displayable, both are made displayable before calculating the preferred size. The Window will be validated after the preferredSize is calculated.

  See Also:
    `Component.isDisplayable()`

### show

    public void show()

  Makes the Window visible. If the Window and/or its owner are not yet displayable, both are made displayable. The Window will be validated prior to being made visible. If the Window is already visible, this will bring the Window to the front.

  Overrides:
    `show` in class `Component`
  See Also:
    `Component.isDisplayable()`, `toFront()`, `Component.setVisible(boolean)`

### hide

    public void hide()

  Hide this Window, its subcomponents, and all of its owned children. The Window and its subcomponents can be made visible again with a call to `show`.

  Overrides:
    `hide` in class `Component`
  See Also:
    `show()`, `dispose()`

### dispose

    public void dispose()

  Releases all of the native screen resources used by this Window, its subcomponents, and all of its owned children. That is, the resources for these Components will be destroyed, any memory they consume will be returned to the OS, and they will be marked as undisplayable.

  The Window and its subcomponents can be made displayable again by rebuilding the native resources with a subsequent call to `pack` or `show`. The states of the recreated Window and its subcomponents will be identical to the states of these objects at the point where the Window was disposed (not accounting for additional modifcations between those actions).

  See Also:
    `Component.isDisplayable()`, `pack()`, `show()`

### toFront

    public void toFront()

  If this Window is visible, brings this Window to the front and may make it the focused Window.

  Places this Window at the top of the stacking order and shows it in front of any other Windows in this VM. No action will take place is this Window is not visible. Some platforms do not allow Windows which own other Windows to appear on top of those owned Windows. Some platforms may not permit this VM to place its Windows above windows of native applications, or Windows of other VMs. This permission may depend on whether a Window in this VM is already focused. Every attempt will be made to move this Window as high as possible in the stacking order; however, developers should not assume that this method will move this Window above all other windows in every situation.

  Because of variations in native windowing systems, no guarantees about changes to the focused and active Windows can be made. Developers must never assume that this Window is the focused or active Window until this Window receives a WINDOW_GAINED_FOCUS or WINDOW_ACTIVATED event. On platforms where the top-most window is the focused window, this method will probably focus this Window, if it is not already focused. On platforms where the stacking order does not typically affect the focused window, this method will probably leave the focused and active Windows unchanged.

  If this method causes this Window to be focused, and this Window is a Frame or a Dialog, it will also become activated. If this Window is focused, but it is not a Frame or a Dialog, then the first Frame or Dialog that is an owner of this Window will be activated.

  See Also:
    `toBack()`

### toBack

    public void toBack()

  If this Window is visible, sends this Window to the back and may cause it to lose focus or activation if it is the focused or active Window.

  Places this Window at the bottom of the stacking order and shows it behind any other Windows in this VM. No action will take place is this Window is not visible. Some platforms do not allow Windows which are owned by other Windows to appear below their owners. Every attempt will be made to move this Window as low as possible in the stacking order; however, developers should not assume that this method will move this Window below all other windows in every situation.

  Because of variations in native windowing systems, no guarantees about changes to the focused and active Windows can be made. Developers must never assume that this Window is no longer the focused or active Window until this Window receives a WINDOW_LOST_FOCUS or WINDOW_DEACTIVATED event. On platforms where the top-most window is the focused window, this method will probably cause this Window to lose focus. In that case, the next highest, focusable Window in this VM will receive focus. On platforms where the stacking order does not typically affect the focused window, this method will probably leave the focused and active Windows unchanged.

  See Also:
    `toFront()`

### getToolkit

    public Toolkit getToolkit()

  Returns the toolkit of this frame.

  Overrides:
    `getToolkit` in class `Component`
  Returns:
    the toolkit of this window.
  See Also:
    `Toolkit`, `Toolkit.getDefaultToolkit()`, `Component.getToolkit()`

### getWarningString

    public final String getWarningString()

  Gets the warning string that is displayed with this window. If this window is insecure, the warning string is displayed somewhere in the visible area of the window. A window is insecure if there is a security manager, and the security manager's `checkTopLevelWindow` method returns `false` when this window is passed to it as an argument.

  If the window is secure, then `getWarningString` returns `null`. If the window is insecure, this method checks for the system property `awt.appletWarning` and returns the string value of that property.

  Returns:
    the warning string for this window.
  See Also:
    `SecurityManager.checkTopLevelWindow(java.lang.Object)`

### getLocale

    public Locale getLocale()

  Gets the `Locale` object that is associated with this window, if the locale has been set. If no locale has been set, then the default locale is returned.

  Overrides:
    `getLocale` in class `Component`
  Returns:
    the locale that is set for this window.
  Since:
    JDK1.1
  See Also:
    `Locale`

### getInputContext

    public InputContext getInputContext()

  Gets the input context for this window. A window always has an input context, which is shared by subcomponents unless they create and set their own.

  Overrides:
    `getInputContext` in class `Component`
  Returns:
    the input context used by this component; `null` if no context can be determined
  Since:
    1.2
  See Also:
    `Component.getInputContext()`

### setCursor

    public void setCursor(Cursor cursor)

  Set the cursor image to a specified cursor.

  Overrides:
    `setCursor` in class `Component`
  Parameters:
    `cursor` - One of the constants defined by the `Cursor` class; if this parameter is `null` then this component will inherit the cursor of its parent
  Since:
    JDK1.1
  See Also:
    `Component.getCursor()`, `Cursor`

### getOwner

    public Window getOwner()

  Returns the owner of this window.

  Since:
    1.2

### getOwnedWindows

    public Window[] getOwnedWindows()

  Return an array containing all the windows this window currently owns.

  Since:
    1.2

### addWindowListener

    public void addWindowListener(WindowListener l)

  Adds the specified window listener to receive window events from this window. If l is null, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window listener
  See Also:
    `removeWindowListener(java.awt.event.WindowListener)`, `getWindowListeners()`

### addWindowStateListener

    public void addWindowStateListener(WindowStateListener l)

  Adds the specified window state listener to receive window events from this window. If `l` is null, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window state listener
  Since:
    1.4
  See Also:
    `removeWindowStateListener(java.awt.event.WindowStateListener)`, `getWindowStateListeners()`

### addWindowFocusListener

    public void addWindowFocusListener(WindowFocusListener l)

  Adds the specified window focus listener to receive window events from this window. If l is null, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window focus listener
  See Also:
    `removeWindowFocusListener(java.awt.event.WindowFocusListener)`, `getWindowFocusListeners()`

### removeWindowListener

    public void removeWindowListener(WindowListener l)

  Removes the specified window listener so that it no longer receives window events from this window. If l is null, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window listener
  See Also:
    `addWindowListener(java.awt.event.WindowListener)`, `getWindowListeners()`

### removeWindowStateListener

    public void removeWindowStateListener(WindowStateListener l)

  Removes the specified window state listener so that it no longer receives window events from this window. If `l` is `null`, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window state listener
  Since:
    1.4
  See Also:
    `addWindowStateListener(java.awt.event.WindowStateListener)`, `getWindowStateListeners()`

### removeWindowFocusListener

    public void removeWindowFocusListener(WindowFocusListener l)

  Removes the specified window focus listener so that it no longer receives window events from this window. If l is null, no exception is thrown and no action is performed.

  Parameters:
    `l` - the window focus listener
  See Also:
    `addWindowFocusListener(java.awt.event.WindowFocusListener)`, `getWindowFocusListeners()`

### getWindowListeners

    public WindowListener[] getWindowListeners()

  Returns an array of all the window listeners registered on this window.

  Returns:
    all of this window's `WindowListener`s or an empty array if no window listeners are currently registered
  Since:
    1.4
  See Also:
    `addWindowListener(java.awt.event.WindowListener)`, `removeWindowListener(java.awt.event.WindowListener)`

### getWindowFocusListeners

    public WindowFocusListener[] getWindowFocusListeners()

  Returns an array of all the window focus listeners registered on this window.

  Returns:
    all of this window's `WindowFocusListener`s or an empty array if no window focus listeners are currently registered
  Since:
    1.4
  See Also:
    `addWindowFocusListener(java.awt.event.WindowFocusListener)`, `removeWindowFocusListener(java.awt.event.WindowFocusListener)`

### getWindowStateListeners

    public WindowStateListener[] getWindowStateListeners()

  Returns an array of all the window state listeners registered on this window.

  Returns:
    all of this window's `WindowStateListener`s or an empty array if no window state listeners are currently registered
  Since:
    1.4
  See Also:
    `addWindowStateListener(java.awt.event.WindowStateListener)`, `removeWindowStateListener(java.awt.event.WindowStateListener)`

### getListeners

    public EventListener[] getListeners(Class listenerType)

  Returns an array of all the objects currently registered as `FooListener`s upon this `Window`. `FooListener`s are registered using the `addFooListener` method.

  You can specify the `listenerType` argument with a class literal, such as `FooListener.class`. For example, you can query a `Window` `w` for its window listeners with the following code:

      WindowListener[] wls = (WindowListener[])(w.getListeners(WindowListener.class));

  If no such listeners exist, this method returns an empty array.

  Overrides:
    `getListeners` in class `Container`
  Parameters:
    `listenerType` - the type of listeners requested; this parameter should specify an interface that descends from `java.util.EventListener`
  Returns:
    an array of all objects registered as `FooListener`s on this window, or an empty array if no such listeners have been added
  Throws:
    `ClassCastException` - if `listenerType` doesn't specify a class or interface that implements `java.util.EventListener`
  Since:
    1.3
  See Also:
    `getWindowListeners()`

### processEvent

    protected void processEvent(AWTEvent e)

  Processes events on this window. If the event is an `WindowEvent`, it invokes the `processWindowEvent` method, else it invokes its superclass's `processEvent`.

  Note that if the event parameter is `null` the behavior is unspecified and may result in an exception.

  Overrides:
    `processEvent` in class `Container`
  Parameters:
    `e` - the event

### processWindowEvent

    protected void processWindowEvent(WindowEvent e)

  Processes window events occurring on this window by dispatching them to any registered WindowListener objects. NOTE: This method will not be called unless window events are enabled for this component; this happens when one of the following occurs:
  - A WindowListener object is registered via `addWindowListener`
  - Window events are enabled via `enableEvents`

  Note that if the event parameter is `null` the behavior is unspecified and may result in an exception.

  Parameters:
    `e` - the window event
  See Also:
    `Component.enableEvents(long)`

### processWindowFocusEvent

    protected void processWindowFocusEvent(WindowEvent e)

  Processes window focus event occuring on this window by dispatching them to any registered WindowFocusListener objects. NOTE: this method will not be called unless window focus events are enabled for this window. This happens when one of the following occurs:
  - a WindowFocusListener is registered via `addWindowFocusListener`
  - Window focus events are enabled via `enableEvents`

  Note that if the event parameter is `null` the behavior is unspecified and may result in an exception.

  Parameters:
    `e` - the window focus event
  See Also:
    `Component.enableEvents(long)`

### processWindowStateEvent

    protected void processWindowStateEvent(WindowEvent e)

  Processes window state event occuring on this window by dispatching them to any registered `WindowStateListener` objects. NOTE: this method will not be called unless window state events are enabled for this window. This happens when one of the following occurs:
  - a `WindowStateListener` is registered via `addWindowStateListener`
  - window state events are enabled via `enableEvents`

  Note that if the event parameter is `null` the behavior is unspecified and may result in an exception.

  Parameters:
    `e` - the window state event
  Since:
    1.4
  See Also:
    `Component.enableEvents(long)`

### getFocusOwner

    public Component getFocusOwner()

  Returns the child Component of this Window that has focus if this Window is focused; returns null otherwise.

  Returns:
    the child Component with focus, or null if this Window is not focused
  See Also:
    `getMostRecentFocusOwner()`, `isFocused()`

### getMostRecentFocusOwner

    public Component getMostRecentFocusOwner()

  Returns the child Component of this Window that will receive the focus when this Window is focused. If this Window is currently focused, this method returns the same Component as `getFocusOwner()`. If this Window is not focused, then the child Component that most recently requested focus will be returned. If no child Component has ever requested focus, and this is a focusable Window, then this Window's initial focusable Component is returned. If no child Component has ever requested focus, and this is a non-focusable Window, null is returned.

  Returns:
    the child Component that will receive focus when this Window is focused
  Since:
    1.4
  See Also:
    `getFocusOwner()`, `isFocused()`, `isFocusableWindow()`

### isActive

    public boolean isActive()

  Returns whether this Window is active. Only a Frame or a Dialog may be active. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.

  Returns:
    whether this is the active Window.
  Since:
    1.4
  See Also:
    `isFocused()`

### isFocused

    public boolean isFocused()

  Returns whether this Window is focused. If there exists a focus owner, the focused Window is the Window that is, or contains, that focus owner. If there is no focus owner, then no Window is focused.

  If the focused Window is a Frame or a Dialog it is also the active Window. Otherwise, the active Window is the first Frame or Dialog that is an owner of the focused Window.

  Returns:
    whether this is the focused Window.
  Since:
    1.4
  See Also:
    `isActive()`

### getFocusTraversalKeys

    public Set getFocusTraversalKeys(int id)

  Gets a focus traversal key for this Window. (See `setFocusTraversalKeys` for a full description of each key.)

  If the traversal key has not been explicitly set for this Window, then this Window's parent's traversal key is returned. If the traversal key has not been explicitly set for any of this Window's ancestors, then the current KeyboardFocusManager's default traversal key is returned.

  Overrides:
    `getFocusTraversalKeys` in class `Container`
  Parameters:
    `id` - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
  Returns:
    the AWTKeyStroke for the specified key
  Throws:
    `IllegalArgumentException` - if id is not one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
  Since:
    1.4
  See Also:
    `Container.setFocusTraversalKeys(int, java.util.Set)`, `KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS`, `KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS`, `KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS`, `KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS`

### setFocusCycleRoot

    public final void setFocusCycleRoot(boolean focusCycleRoot)

  Does nothing because Windows must always be roots of a focus traversal cycle. The passed-in value is ignored.

  Overrides:
    `setFocusCycleRoot` in class `Container`
  Parameters:
    `focusCycleRoot` - this value is ignored
  Since:
    1.4
  See Also:
    `isFocusCycleRoot()`, `Container.setFocusTraversalPolicy(java.awt.FocusTraversalPolicy)`, `Container.getFocusTraversalPolicy()`

### isFocusCycleRoot

    public final boolean isFocusCycleRoot()

  Always returns `true` because all Windows must be roots of a focus traversal cycle.

  Overrides:
    `isFocusCycleRoot` in class `Container`
  Returns:
    `true`
  Since:
    1.4
  See Also:
    `setFocusCycleRoot(boolean)`, `Container.setFocusTraversalPolicy(java.awt.FocusTraversalPolicy)`, `Container.getFocusTraversalPolicy()`

### getFocusCycleRootAncestor

    public final Container getFocusCycleRootAncestor()

  Always returns `null` because Windows have no ancestors; they represent the top of the Component hierarchy.

  Overrides:
    `getFocusCycleRootAncestor` in class `Component`
  Returns:
    `null`
  Since:
    1.4
  See Also:
    `Container.isFocusCycleRoot()`

### isFocusableWindow

    public final boolean isFocusableWindow()

  Returns whether this Window can become the focused Window, that is, whether this Window or any of its subcomponents can become the focus owner. For a Frame or Dialog to be focusable, its focusable Window state must be set to `true`. For a Window which is not a Frame or Dialog to be focusable, its focusable Window state must be set to `true`, its nearest owning Frame or Dialog must be showing on the screen, and it must contain at least one Component in its focus traversal cycle. If any of these conditions is not met, then neither this Window nor any of its subcomponents can become the focus owner.

  Returns:
    `true` if this Window can be the focused Window; `false` otherwise
  Since:
    1.4
  See Also:
    `getFocusableWindowState()`, `setFocusableWindowState(boolean)`, `isShowing()`, `Component.isFocusable()`

### getFocusableWindowState

    public boolean getFocusableWindowState()

  Returns whether this Window can become the focused Window if it meets the other requirements outlined in `isFocusableWindow`. If this method returns `false`, then `isFocusableWindow` will return `false` as well. If this method returns `true`, then `isFocusableWindow` may return `true` or `false` depending upon the other requirements which must be met in order for a Window to be focusable.

  By default, all Windows have a focusable Window state of `true`.

  Returns:
    whether this Window can be the focused Window
  Since:
    1.4
  See Also:
    `isFocusableWindow()`, `setFocusableWindowState(boolean)`, `isShowing()`, `Component.setFocusable(boolean)`

### setFocusableWindowState

    public void setFocusableWindowState(boolean focusableWindowState)

  Sets whether this Window can become the focused Window if it meets the other requirements outlined in `isFocusableWindow`. If this Window's focusable Window state is set to `false`, then `isFocusableWindow` will return `false`. If this Window's focusable Window state is set to `true`, then `isFocusableWindow` may return `true` or `false` depending upon the other requirements which must be met in order for a Window to be focusable.

  Setting a Window's focusability state to `false` is the standard mechanism for an application to identify to the AWT a Window which will be used as a floating palette or toolbar, and thus should be a non-focusable Window.

  Parameters:
    `focusableWindowState` - whether this Window can be the focused Window
  Since:
    1.4
  See Also:
    `isFocusableWindow()`, `getFocusableWindowState()`, `isShowing()`, `Component.setFocusable(boolean)`

### addPropertyChangeListener

    public void addPropertyChangeListener(PropertyChangeListener listener)

  Adds a PropertyChangeListener to the listener list. The listener is registered for all bound properties of this class, including the following:
  - this Window's font ("font")
  - this Window's background color ("background")
  - this Window's foreground color ("foreground")
  - this Window's focusability ("focusable")
  - this Window's focus traversal keys enabled state ("focusTraversalKeysEnabled")
  - this Window's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
  - this Window's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
  - this Window's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
  - this Window's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys")
  - this Window's focus traversal policy ("focusTraversalPolicy")
  - this Window's focusable Window state ("focusableWindowState")
  Note that if this Window is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

  If listener is null, no exception is thrown and no action is performed.

  Overrides:
    `addPropertyChangeListener` in class `Container`
  Parameters:
    `listener` - the PropertyChangeListener to be added
  See Also:
    `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`, `addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)`

### addPropertyChangeListener

    public void addPropertyChangeListener(String propertyName,
                                          PropertyChangeListener listener)

  Adds a PropertyChangeListener to the listener list for a specific property. The specified property may be user-defined, or one of the following:
  - this Window's font ("font")
  - this Window's background color ("background")
  - this Window's foreground color ("foreground")
  - this Window's focusability ("focusable")
  - this Window's focus traversal keys enabled state ("focusTraversalKeysEnabled")
  - this Window's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
  - this Window's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
  - this Window's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
  - this Window's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys")
  - this Window's focus traversal policy ("focusTraversalPolicy")
  - this Window's focusable Window state ("focusableWindowState")
  Note that if this Window is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

  If listener is null, no exception is thrown and no action is performed.

  Overrides:
    `addPropertyChangeListener` in class `Container`
  Parameters:
    `propertyName` - one of the property names listed above
    `listener` - the PropertyChangeListener to be added
  See Also:
    `addPropertyChangeListener(java.beans.PropertyChangeListener)`, `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`

### postEvent

    public boolean postEvent(Event e)

  Deprecated. As of JDK version 1.1 replaced by `dispatchEvent(AWTEvent)`.

  Specified by:
    `postEvent` in interface `MenuContainer`
  Overrides:
    `postEvent` in class `Component`

### isShowing

    public boolean isShowing()

  Checks if this Window is showing on screen.

  Overrides:
    `isShowing` in class `Component`
  Returns:
    `true` if the component is showing, `false` otherwise
  See Also:
    `Component.setVisible(boolean)`

### applyResourceBundle

    public void applyResourceBundle(ResourceBundle rb)

  Deprecated. As of J2SE 1.4, replaced by `Component.applyComponentOrientation`.

  Applies the ResourceBundle's ComponentOrientation to this Window and all components contained within it.

  Since:
    1.2
  See Also:
    `ComponentOrientation`

### applyResourceBundle

    public void applyResourceBundle(String rbName)

  Deprecated. As of J2SE 1.4, replaced by `Component.applyComponentOrientation`.

  Loads the ResourceBundle with the given name using the default locale and applies its ComponentOrientation to this Window and all components contained within it.

  Since:
    1.2
  See Also:
    `ComponentOrientation`

### getAccessibleContext

    public AccessibleContext getAccessibleContext()

  Gets the AccessibleContext associated with this Window. For windows, the AccessibleContext takes the form of an AccessibleAWTWindow. A new AccessibleAWTWindow instance is created if necessary.

  Specified by:
    `getAccessibleContext` in interface `Accessible`
  Overrides:
    `getAccessibleContext` in class `Component`
  Returns:
    an AccessibleAWTWindow that serves as the AccessibleContext of this Window

### getGraphicsConfiguration

    public GraphicsConfiguration getGraphicsConfiguration()

  This method returns the GraphicsConfiguration used by this Window.

  Overrides:
    `getGraphicsConfiguration` in class `Component`
  Returns:
    the `GraphicsConfiguration` used by this `Component` or `null`

### setLocationRelativeTo

    public void setLocationRelativeTo(Component c)

  Sets the location of the window relative to the specified component. If the component is not currently showing, or `c` is `null`, the window is centered on the screen. If the bottom of the component is offscreen, the window is displayed to the right of the component.

  Parameters:
    `c` - the component in relation to which the window's location is determined
  Since:
    1.4

### createBufferStrategy

    public void createBufferStrategy(int numBuffers)

  Creates a new strategy for multi-buffering on this component. Multi-buffering is useful for rendering performance. This method attempts to create the best strategy available with the number of buffers supplied. It will always create a `BufferStrategy` with that number of buffers. A page-flipping strategy is attempted first, then a blitting strategy using accelerated buffers. Finally, an unaccelerated blitting strategy is used.

  Each time this method is called, the existing buffer strategy for this component is discarded.

  Overrides:
    `createBufferStrategy` in class `Component`
  Parameters:
    `numBuffers` - number of buffers to create
  Throws:
    `IllegalArgumentException` - if numBuffers is less than 1.
    `IllegalStateException` - if the component is not displayable
  Since:
    1.4
  See Also:
    `Component.isDisplayable()`, `getBufferStrategy()`

### createBufferStrategy

    public void createBufferStrategy(int numBuffers,
                                     BufferCapabilities caps)
                              throws AWTException

  Creates a new strategy for multi-buffering on this component with the required buffer capabilities. This is useful, for example, if only accelerated memory or page flipping is desired (as specified by the buffer capabilities).

  Each time this method is called, the existing buffer strategy for this component is discarded.

  Overrides:
    `createBufferStrategy` in class `Component`
  Parameters:
    `numBuffers` - number of buffers to create, including the front buffer
    `caps` - the required capabilities for creating the buffer strategy; cannot be `null`
  Throws:
    `AWTException` - if the capabilities supplied could not be supported or met; this may happen, for example, if there is not enough accelerated memory currently available, or if page flipping is specified but not possible.
    `IllegalArgumentException` - if numBuffers is less than 1, or if caps is `null`
  Since:
    1.4
  See Also:
    `getBufferStrategy()`

### getBufferStrategy

    public BufferStrategy getBufferStrategy()

  Overrides:
    `getBufferStrategy` in class `Component`
  Returns:
    the buffer strategy used by this component
  Since:
    1.4
  See Also:
    `createBufferStrategy(int)`

Overview | Package | Class | Use | Tree | Deprecated | Index | Help

JavaTM 2 Platform
Std. Ed. v1.4.1_"07"

PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

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.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.