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138 lines
4.8 KiB
Java
138 lines
4.8 KiB
Java
/* ComponentEvent.java -- notification of events for components
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Copyright (C) 1999, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.event;
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import java.awt.AWTEvent;
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import java.awt.Component;
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/**
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* This class is for events generated when a component is moved, resized,
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* hidden, or shown. These events normally do not need to be handled by the
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* application, since the AWT system automatically takes care of them. This
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* is also the superclass for other events on components, but
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* ComponentListeners ignore such subclasses.
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*
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* @author Aaron M. Renn <arenn@urbanophile.com>
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* @see ComponentAdapter
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* @see ComponentListener
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* @since 1.1
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* @status updated to 1.4
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*/
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public class ComponentEvent extends AWTEvent
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{
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/**
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* Compatible with JDK 1.1+.
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*/
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private static final long serialVersionUID = 8101406823902992965L;
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/** This is the first id in the range of ids used by this class. */
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public static final int COMPONENT_FIRST = 100;
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/** This is the last id in the range of ids used by this class. */
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public static final int COMPONENT_LAST = 103;
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/** This id indicates that a component was moved. */
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public static final int COMPONENT_MOVED = 100;
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/** This id indicates that a component was resized. */
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public static final int COMPONENT_RESIZED = 101;
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/** This id indicates that a component was shown. */
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public static final int COMPONENT_SHOWN = 102;
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/** This id indicates that a component was hidden. */
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public static final int COMPONENT_HIDDEN = 103;
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/**
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* Initializes a new instance of <code>ComponentEvent</code> with the
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* specified source and id. Note that an invalid id leads to unspecified
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* results.
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*
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* @param source the source of the event
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* @param id the event id
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* @throws IllegalArgumentException if source is null
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*/
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public ComponentEvent(Component source, int id)
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{
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super(source, id);
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}
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/**
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* This method returns the event source as a <code>Component</code>. If the
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* source has subsequently been modified to a non-Component, this returns
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* null.
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*
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* @return the event source as a <code>Component</code>, or null
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*/
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public Component getComponent()
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{
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return source instanceof Component ? (Component) source : null;
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}
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/**
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* This method returns a string identifying this event. This is the field
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* name of the id type, and for COMPONENT_MOVED or COMPONENT_RESIZED, the
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* new bounding box of the component.
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*
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* @return a string identifying this event
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*/
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public String paramString()
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{
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// Unlike Sun, we don't throw NullPointerException or ClassCastException
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// when source was illegally changed.
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switch (id)
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{
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case COMPONENT_MOVED:
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return "COMPONENT_MOVED "
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+ (source instanceof Component
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? ((Component) source).getBounds() : (Object) "");
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case COMPONENT_RESIZED:
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return "COMPONENT_RESIZED "
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+ (source instanceof Component
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? ((Component) source).getBounds() : (Object) "");
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case COMPONENT_SHOWN:
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return "COMPONENT_SHOWN";
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case COMPONENT_HIDDEN:
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return "COMPONENT_HIDDEN";
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default:
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return "unknown type";
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}
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}
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} // class ComponentEvent
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