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/* ComponentEvent.java -- notification of events for components

   Copyright (C) 1999, 2002, 2005, 2006  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.awt.event;

import gnu.java.lang.CPStringBuilder;

import java.awt.AWTEvent;

import java.awt.Component;

/**

 * This class is for events generated when a component is moved, resized,

 * hidden, or shown.  These events normally do not need to be handled by the

 * application, since the AWT system automatically takes care of them. This

 * is also the superclass for other events on components, but

 * ComponentListeners ignore such subclasses.

 *

 * @author Aaron M. Renn (arenn@urbanophile.com)

 * @see ComponentAdapter

 * @see ComponentListener

 * @since 1.1

 * @status updated to 1.4

 */

public class ComponentEvent extends AWTEvent

{

  /**

   * Compatible with JDK 1.1+.

   */

  private static final long serialVersionUID = 8101406823902992965L;

  /** This is the first id in the range of ids used by this class. */

  public static final int COMPONENT_FIRST = 100;

  /** This is the last id in the range of ids used by this class. */

  public static final int COMPONENT_LAST = 103;

  /** This id indicates that a component was moved. */

  public static final int COMPONENT_MOVED = 100;

  /** This id indicates that a component was resized. */

  public static final int COMPONENT_RESIZED = 101;

  /** This id indicates that a component was shown. */

  public static final int COMPONENT_SHOWN = 102;

  /** This id indicates that a component was hidden. */

  public static final int COMPONENT_HIDDEN = 103;

  /**

   * Initializes a new instance of <code>ComponentEvent</code> with the

   * specified source and id. Note that an invalid id leads to unspecified

   * results.

   *

   * @param source the source of the event

   * @param id the event id

   * @throws IllegalArgumentException if source is null

   */

  public ComponentEvent(Component source, int id)

  {

    super(source, id);

  }

  /**

   * This method returns the event source as a <code>Component</code>. If the

   * source has subsequently been modified to a non-Component, this returns

   * null.

   *

   * @return the event source as a <code>Component</code>, or null

   */

  public Component getComponent()

  {

    return source instanceof Component ? (Component) source : null;

  }

  /**

   * This method returns a string identifying this event. This is the field

   * name of the id type, and for COMPONENT_MOVED or COMPONENT_RESIZED, the

   * new bounding box of the component.

   *

   * @return a string identifying this event

   */

  public String paramString()

  {

    CPStringBuilder s = new CPStringBuilder();

    // Unlike Sun, we don't throw NullPointerException or ClassCastException

    // when source was illegally changed.

    if (id == COMPONENT_MOVED)

      s.append("COMPONENT_MOVED ");

    else if (id == COMPONENT_RESIZED)

      s.append("COMPONENT_RESIZED ");

    else if (id == COMPONENT_SHOWN)

      s.append("COMPONENT_SHOWN ");

    else if (id == COMPONENT_HIDDEN)

      s.append("COMPONENT_HIDDEN ");

    else

      return "unknown type";

    s.append("(").append(getComponent().getX()).append(",")

      .append(getComponent().getY()).append(" ")

      .append(getComponent().getWidth()).append("x")

      .append(getComponent().getHeight()).append(")");

    return s.toString();

  }

} // class ComponentEvent