heavyweightcontainer.java

修正了jdk1.6中对托盘事件产生异常的bug.

/*
 * Copyright (C) 2004 NNL Technology AB
 * Visit www.infonode.net for information about InfoNode(R) 
 * products and how to contact NNL Technology AB.
 *
 * This program 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA 02111-1307, USA.
 */


// $Id: HeavyWeightContainer.java,v 1.5 2005/12/04 13:46:04 jesper Exp $

package net.infonode.docking.internal;

import java.awt.*;

/**
 * @author johan
 */
public class HeavyWeightContainer extends Panel {
  private Image bufferImage;
  private boolean doubleBuffer = false;

  public HeavyWeightContainer(Component c) {
    this(c, false);
  }

  public HeavyWeightContainer(Component c, boolean doubleBuffer) {
    super(new BorderLayout());
    this.doubleBuffer = doubleBuffer;
    add(c, BorderLayout.CENTER);
  }

  public void invalidate() {
    super.invalidate();
    bufferImage = null;
  }

  public void update(Graphics g) {
    if (doubleBuffer)
      paint(g);
    else
      super.update(g);
  }

  public boolean isDoubleBuffered() {
    return doubleBuffer;
  }

  public void paint(Graphics g) {
    if (doubleBuffer) {
      if (bufferImage == null)
        bufferImage = createImage(getWidth(), getHeight());

      Graphics g2 = bufferImage.getGraphics();
      g2.setColor(getBackground());
      g2.fillRect(0, 0, getWidth(), getHeight());
      super.paint(g2);

      g.drawImage(bufferImage, 0, 0, null);
      g2.dispose();
    }
    else {
      super.paint(g);
    }
  }
}