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package javax.swing.event;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
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. As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder.
Author: Dave Moore
/**
* An event reported to a child component that originated from an
* ancestor in the component hierarchy.
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Dave Moore
*/
@SuppressWarnings("serial")
public class AncestorEvent extends AWTEvent {
An ancestor-component was added to the hierarchy of
visible objects (made visible), and is currently being displayed.
/**
* An ancestor-component was added to the hierarchy of
* visible objects (made visible), and is currently being displayed.
*/
public static final int ANCESTOR_ADDED = 1;
An ancestor-component was removed from the hierarchy
of visible objects (hidden) and is no longer being displayed.
/**
* An ancestor-component was removed from the hierarchy
* of visible objects (hidden) and is no longer being displayed.
*/
public static final int ANCESTOR_REMOVED = 2;
An ancestor-component changed its position on the screen. /** An ancestor-component changed its position on the screen. */
public static final int ANCESTOR_MOVED = 3;
Container ancestor;
Container ancestorParent;
Constructs an AncestorEvent object to identify a change
in an ancestor-component's display-status.
Params: - 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
/**
* Constructs an AncestorEvent object to identify a change
* in an ancestor-component's display-status.
*
* @param source the JComponent that originated the event
* (typically <code>this</code>)
* @param id an int specifying {@link #ANCESTOR_ADDED},
* {@link #ANCESTOR_REMOVED} or {@link #ANCESTOR_MOVED}
* @param ancestor a Container object specifying the ancestor-component
* whose display-status changed
* @param ancestorParent a Container object specifying the ancestor's parent
*/
public AncestorEvent(JComponent source, int id, Container ancestor, Container ancestorParent) {
super(source, id);
this.ancestor = ancestor;
this.ancestorParent = ancestorParent;
}
Returns the ancestor that the event actually occurred on.
Returns: the Container object specifying the ancestor component
/**
* Returns the ancestor that the event actually occurred on.
*
* @return the {@code Container} object specifying the ancestor component
*/
public Container getAncestor() {
return ancestor;
}
Returns the parent of the ancestor the event actually occurred on.
This is most interesting in an ANCESTOR_REMOVED event, as
the ancestor may no longer be in the component hierarchy.
Returns: the Container object specifying the ancestor's parent
/**
* Returns the parent of the ancestor the event actually occurred on.
* This is most interesting in an ANCESTOR_REMOVED event, as
* the ancestor may no longer be in the component hierarchy.
*
* @return the {@code Container} object specifying the ancestor's parent
*/
public Container getAncestorParent() {
return ancestorParent;
}
Returns the component that the listener was added to.
Returns: the JComponent on which the event occurred
/**
* Returns the component that the listener was added to.
*
* @return the {@code JComponent} on which the event occurred
*/
public JComponent getComponent() {
return (JComponent)getSource();
}
}