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VCAFE.3.0A
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ComponentEvent.java
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1998-09-22
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/*
* @(#)ComponentEvent.java 1.15 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.awt.event;
import java.awt.AWTEvent;
import java.awt.Event;
import java.awt.Component;
import java.awt.Rectangle;
/**
* The root event class for all component-level events.
* These events are provided for notification purposes ONLY;
* The AWT will automatically handle component moves and resizes
* internally so that GUI layout works properly regardless of
* whether a program is receiving these events or not.
*
* @see ComponentListener
*
* @version 1.15 07/01/98
* @author Carl Quinn
*/
public class ComponentEvent extends AWTEvent {
/**
* Marks the first integer id for the range of component event ids.
*/
public static final int COMPONENT_FIRST = 100;
/**
* Marks the last integer id for the range of component event ids.
*/
public static final int COMPONENT_LAST = 103;
/**
* The component moved event type.
*/
public static final int COMPONENT_MOVED = COMPONENT_FIRST;
/**
* The component resized event type.
*/
public static final int COMPONENT_RESIZED = 1 + COMPONENT_FIRST;
/**
* The component shown event type.
*/
public static final int COMPONENT_SHOWN = 2 + COMPONENT_FIRST;
/**
* The component hidden event type.
*/
public static final int COMPONENT_HIDDEN = 3 + COMPONENT_FIRST;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 8101406823902992965L;
/**
* Constructs a ComponentEvent object with the specified source component
* and type.
* @param source the component where the event originated
* @id the event type
*/
public ComponentEvent(Component source, int id) {
super(source, id);
}
/**
* Returns the component where this event originated.
*/
public Component getComponent() {
// return (source instanceof Component) ? (Component)source : null;
return (Component)source; // cast should always be OK, type was checked in constructor
}
public String paramString() {
String typeStr;
Rectangle b = (source !=null
? ((Component)source).getBounds()
: null);
switch(id) {
case COMPONENT_SHOWN:
typeStr = "COMPONENT_SHOWN";
break;
case COMPONENT_HIDDEN:
typeStr = "COMPONENT_HIDDEN";
break;
case COMPONENT_MOVED:
typeStr = "COMPONENT_MOVED ("+
b.x+","+b.y+" "+b.width+"x"+b.height+")";
break;
case COMPONENT_RESIZED:
typeStr = "COMPONENT_RESIZED ("+
b.x+","+b.y+" "+b.width+"x"+b.height+")";
break;
default:
typeStr = "unknown type";
}
return typeStr;
}
}