Class java.awt.Window - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.Window

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

public class Window
extends Container

A Window object is a top-level window with no borders and no menubar. It could be used to implement a pop-up menu. The default layout for a window is BorderLayout. A Window object blocks input to other application windows when it is shown.

Windows are capable of generating the following window events: WindowOpened, WindowClosed.

See Also:: WindowEvent, addWindowListener, BorderLayout

Window(Frame): Constructs a new invisible window.

addNotify(): Creates the Window's peer.
addWindowListener(WindowListener): Adds the specified window listener to receive window events from this window.
dispose(): Disposes of this window.
getFocusOwner(): Returns the child component of this Window which has focus if and only if this Window is active.
getLocale(): Gets the Locale object that is associated with this window, if the locale has been set.
getToolkit(): Returns the toolkit of this frame.
getWarningString(): Gets the warning string that is displayed with this window.
isShowing(): Checks if this Window is showing on screen.
pack(): Causes subcomponents of this window to be laid out at their preferred size.
postEvent(Event): Deprecated.
processEvent(AWTEvent): Processes events on this window.
processWindowEvent(WindowEvent): Processes window events occurring on this window by dispatching them to any registered WindowListener objects.
removeWindowListener(WindowListener): Removes the specified window listener so that it no longer receives window events from this window.
setCursor(Cursor): Set the cursor image to a predefined cursor.
show(): Shows this window, and brings it to the front.
toBack(): Sends this window to the back.
toFront(): Brings this window to the front.

Window

 public Window(Frame parent)

Constructs a new invisible window.

The window is not initially visible. Call the show method to cause the window to become visible.

Parameters:: parent - the main application frame.
See Also:: show, setSize

addNotify

 public void addNotify()

Creates the Window's peer. The peer allows us to modify the appearance of the Window without changing its functionality.

Overrides:: addNotify in class Container

pack

 public void pack()

Causes subcomponents of this window to be laid out at their preferred size.

show

 public void show()

Shows this window, and brings it to the front.

If this window is not yet visible, show makes it visible. If this window is already visible, then this method brings it to the front.

Overrides:: show in class Component
See Also:: toFront, setVisible

dispose

 public void dispose()

Disposes of this window. This method must be called to release the resources that are used for the window.

toFront

 public void toFront()

Brings this window to the front. Places this window at the top of the stacking order and shows it in front of any other windows.

See Also:: toBack

toBack

 public void toBack()

Sends this window to the back. Places this window at the bottom of the stacking order and makes the corresponding adjustment to other visible windows.

See Also:: toFront

getToolkit

 public Toolkit getToolkit()

Returns the toolkit of this frame.

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

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.

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

setCursor

 public synchronized void setCursor(Cursor cursor)

Set the cursor image to a predefined cursor.

Parameters:: cursor - One of the constants defined by the Cursor class. If this parameter is null then the cursor for this window will be set to the type Cursor.DEFAULT_CURSOR .
Overrides:: setCursor in class Container
See Also:: getCursor, Cursor

addWindowListener

 public synchronized void addWindowListener(WindowListener l)

Adds the specified window listener to receive window events from this window.

Parameters:: l - the window listener

removeWindowListener

 public synchronized void removeWindowListener(WindowListener l)

Removes the specified window listener so that it no longer receives window events from this window.

Parameters:: l - the window listener

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.

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

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) A WindowListener object is registered via addWindowListener() b) Window events are enabled via enableEvents()

Parameters:: e - the window event
See Also:: enableEvents

getFocusOwner

 public Component getFocusOwner()

Returns the child component of this Window which has focus if and only if this Window is active.

Returns:: the component with focus, or null if no children have focus assigned to them.

postEvent

 public boolean postEvent(Event e)

Note: postEvent() is deprecated. As of JDK version 1.1 replaced by dispatchEvent(AWTEvent).

Overrides:: postEvent in class Component

isShowing

 public boolean isShowing()

Checks if this Window is showing on screen.

Overrides:: isShowing in class Component
See Also:: setVisible

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