Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class WindowEvent - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Edition

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java.awt.event
Class WindowEvent

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--java.awt.AWTEvent
              |
              +--java.awt.event.ComponentEvent
                    |
                    +--java.awt.event.WindowEvent

public class WindowEvent
extends ComponentEvent

A low-level event which indicates that a window has changed its status. This low-level event is generated by a Window object when it is opened, closed, about to close, activated or deactivated, iconified or deconified.

The event is passed to every WindowListener or WindowAdapter object which registered to receive such events using the window's addWindowListener method. (WindowAdapter objects implement the WindowListener interface.) Each such listener object gets this WindowEvent when the event occurs.

See Also:: WindowAdapter, WindowListener, Tutorial: Writing a Window Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary

static int WINDOW_ACTIVATED
          The window activated event type.

static int WINDOW_CLOSED
          The window closed event.

static int WINDOW_CLOSING
          The "window is closing" event.

static int WINDOW_DEACTIVATED
          The window deactivated event type.

static int WINDOW_DEICONIFIED
          The window deiconified event type.

static int WINDOW_FIRST
          The first number in the range of ids used for window events.

static int WINDOW_ICONIFIED
          The window iconified event.

static int WINDOW_LAST
          The last number in the range of ids used for window events.

static int WINDOW_OPENED
          The window opened event.

Fields inherited from class java.awt.event.ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Constructor Summary

WindowEvent(Window source, int id)
          Constructs a WindowEvent object.

Method Summary

Window getWindow()
          Returns the originator of the event.

String paramString()
          Returns a parameter string identifying this event.

Methods inherited from class java.awt.event.ComponentEvent

getComponent

Methods inherited from class java.awt.AWTEvent

consume, finalize, getID, isConsumed, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Detail

WINDOW_FIRST

public static final int WINDOW_FIRST

The first number in the range of ids used for window events.

WINDOW_LAST

public static final int WINDOW_LAST

The last number in the range of ids used for window events.

WINDOW_OPENED

public static final int WINDOW_OPENED

The window opened event. This event is delivered only the first time a window is made visible.

WINDOW_CLOSING

public static final int WINDOW_CLOSING

The "window is closing" event. This event is delivered when the user attempts to close the window from the window's system menu. If the program does not explicitly hide or dispose the window while processing this event, the window close operation will be cancelled.

WINDOW_CLOSED

public static final int WINDOW_CLOSED

The window closed event. This event is delivered after the window has been closed as the result of a call to dispose.

WINDOW_ICONIFIED

public static final int WINDOW_ICONIFIED

The window iconified event. This event is delivered when the window has been changed from a normal to a minimized state. For many platforms, a minimized window is displayed as the icon specified in the window's iconImage property.

See Also:: Frame#setIconImage

WINDOW_DEICONIFIED

public static final int WINDOW_DEICONIFIED

The window deiconified event type. This event is delivered when the window has been changed from a minimized to a normal state.

WINDOW_ACTIVATED

public static final int WINDOW_ACTIVATED

The window activated event type. This event is delivered when the window becomes the user's active window, which means that the window (or one of its subcomponents) will receive keyboard events.

WINDOW_DEACTIVATED

public static final int WINDOW_DEACTIVATED

The window deactivated event type. This event is delivered when a window is no longer the user's active window, which means keyboard events will no longer be delivered to the window or its subcomponents.

Constructor Detail

WindowEvent

public WindowEvent(Window source,
                   int id)

Constructs a WindowEvent object.

Parameters:: source - the Window object that originated the event; id - an integer indicating the type of event

Method Detail

getWindow

public Window getWindow()

Returns the originator of the event.

Returns:: the Window object that originated the event

paramString

public String paramString()

Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

Overrides:: paramString in class ComponentEvent

Returns:: a string identifying the event and its attributes