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

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javax.swing.event
Class AncestorEvent

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--java.awt.AWTEvent
              |
              +--javax.swing.event.AncestorEvent

public class AncestorEvent
extends AWTEvent

An event reported to a child component that originated from an ancestor in the component hierarchy.

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:: Serialized Form

Field Summary

static int ANCESTOR_ADDED
          An ancestor-component was added to the hierarchy of visible objects (made visible), and is currently being displayed.

static int ANCESTOR_MOVED
          An ancestor-component changed its position on the screen.

static int ANCESTOR_REMOVED
          An ancestor-component was removed from the hierarchy of visible objects (hidden) and is no longer being displayed.

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

AncestorEvent(JComponent source, int id, Container ancestor, Container ancestorParent)
          Constructs an AncestorEvent object to identify a change in an ancestor-component's display-status.

Method Summary

Container getAncestor()
          Returns the ancestor that the event actually occured on.

Container getAncestorParent()
          Returns the parent of the ancestor the event actually occured on.

JComponent getComponent()
          Returns the component that the listener was added to.

Methods inherited from class java.awt.AWTEvent

consume, finalize, getID, isConsumed, paramString, 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

ANCESTOR_ADDED

public static final int ANCESTOR_ADDED

An ancestor-component was added to the hierarchy of visible objects (made visible), and is currently being displayed.

ANCESTOR_REMOVED

public static final int ANCESTOR_REMOVED

An ancestor-component was removed from the hierarchy of visible objects (hidden) and is no longer being displayed.

ANCESTOR_MOVED

public static final int ANCESTOR_MOVED

An ancestor-component changed its position on the screen.

Constructor Detail

AncestorEvent

public AncestorEvent(JComponent source,
                     int id,
                     Container ancestor,
                     Container ancestorParent)

Constructs an AncestorEvent object to identify a change in an ancestor-component's display-status.

Parameters:: source - the JComponent that originated the event (typically this); id - an int specifying ANCESTOR_ADDED, ANCESTOR_REMOVED or ANCESTOR_MOVED; ancestor - a Container object specifying the ancestor-component whose display-status changed; ancestorParent - a Container object specifying the ancestor's parent

Method Detail

getAncestor

public Container getAncestor()

Returns the ancestor that the event actually occured on.

getAncestorParent

public Container getAncestorParent()

Returns the parent of the ancestor the event actually occured on. This is most interesting in an ANCESTOR_REMOVED event, as the ancestor may no longer be in the component hierarchy.

getComponent

public JComponent getComponent()

Returns the component that the listener was added to.