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Java example source code file (ComponentEvent.java)
The ComponentEvent.java Java example source code/*
* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.awt.event;
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Rectangle;
import java.lang.annotation.Native;
/**
* A low-level event which indicates that a component moved, changed
* size, or changed visibility (also, the root class for the other
* component-level events).
* <P>
* Component 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.
* <P>
* In addition to serving as the base class for other component-related
* events (InputEvent, FocusEvent, WindowEvent, ContainerEvent),
* this class defines the events that indicate changes in
* a component's size, position, or visibility.
* <P>
* This low-level event is generated by a component object (such as a
* List) when the component is moved, resized, rendered invisible, or made
* visible again. The event is passed to every <code>ComponentListener
* or <code>ComponentAdapter object which registered to receive such
* events using the component's <code>addComponentListener method.
* (<code>ComponentAdapter objects implement the
* <code>ComponentListener interface.) Each such listener object
* gets this <code>ComponentEvent when the event occurs.
* <p>
* An unspecified behavior will be caused if the {@code id} parameter
* of any particular {@code ComponentEvent} instance is not
* in the range from {@code COMPONENT_FIRST} to {@code COMPONENT_LAST}.
*
* @see ComponentAdapter
* @see ComponentListener
* @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html">Tutorial: Writing a Component Listener
*
* @author Carl Quinn
* @since 1.1
*/
public class ComponentEvent extends AWTEvent {
/**
* The first number in the range of ids used for component events.
*/
public static final int COMPONENT_FIRST = 100;
/**
* The last number in the range of ids used for component events.
*/
public static final int COMPONENT_LAST = 103;
/**
* This event indicates that the component's position changed.
*/
@Native public static final int COMPONENT_MOVED = COMPONENT_FIRST;
/**
* This event indicates that the component's size changed.
*/
@Native public static final int COMPONENT_RESIZED = 1 + COMPONENT_FIRST;
/**
* This event indicates that the component was made visible.
*/
@Native public static final int COMPONENT_SHOWN = 2 + COMPONENT_FIRST;
/**
* This event indicates that the component was rendered invisible.
*/
@Native public static final int COMPONENT_HIDDEN = 3 + COMPONENT_FIRST;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 8101406823902992965L;
/**
* Constructs a <code>ComponentEvent object.
* <p> This method throws an
* <code>IllegalArgumentException if
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