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136 lines
4.6 KiB
Java
136 lines
4.6 KiB
Java
/* ContainerEvent.java -- components added/removed from a container
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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.Component;
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import java.awt.Container;
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/**
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* This event is generated when a component is added or removed from a
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* container. Applications do not ordinarily need to handle these events
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* since the AWT system handles them internally.
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*
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* @author Aaron M. Renn <arenn@urbanophile.com>
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* @see ContainerAdapter
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* @see ContainerListener
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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 ContainerEvent extends ComponentEvent
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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 = -4114942250539772041L;
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/** This is the first id in the id range used by this class. */
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public static final int CONTAINER_FIRST = 300;
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/** This is the last id in the id range used by this class. */
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public static final int CONTAINER_LAST = 301;
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/** This id indicates a component was added to the container. */
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public static final int COMPONENT_ADDED = 300;
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/** This id indicates a component was removed from the container. */
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public static final int COMPONENT_REMOVED = 301;
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/**
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* The non-null child component that was added or removed.
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*
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* @serial the child component that changed
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*/
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private final Component child;
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/**
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* Initializes a new instance of <code>ContainerEvent</code> with the
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* specified source and id. Additionally, the affected child component
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* is also passed as a parameter. Note that an invalid id leads to
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* unspecified results.
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*
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* @param source the source container of the event
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* @param id the event id
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* @param child the child component affected by this event
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* @throws IllegalArgumentException if source is null
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*/
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public ContainerEvent(Component source, int id, Component child)
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{
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super(source, id);
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this.child = child;
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}
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/**
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* Returns the source of this event as a <code>Container</code>.
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*
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* @return the source of the event
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* @throws ClassCastException if the source is changed to a non-Container
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*/
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public Container getContainer()
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{
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return (Container) source;
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}
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/**
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* This method returns the child object that was added or removed from
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* the container.
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*
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* @return the child object added or removed
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*/
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public Component getChild()
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{
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return child;
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}
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/**
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* This method returns a string identifying this event. It is formatted as:
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* <code>(getID() == COMPONENT_ADDED ? "COMPONENT_ADDED"
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* : "COMPONENT_REMOVED") + ",child=" + getChild().getName()</code>.
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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 if child is illegally
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// null.
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return (id == COMPONENT_ADDED ? "COMPONENT_ADDED,child="
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: id == COMPONENT_REMOVED ? "COMPONENT_REMOVED,child="
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: "unknown type,child=") + (child == null ? "" : child.getName());
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}
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} // class ContainerEvent
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