Source Code : Center that window on the given desktop.

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Center that window on the given desktop.

   
/*
 * $Id: WindowUtils.java,v 1.16 2009/05/25 16:37:52 kschaefe Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.JInternalFrame;

/**
 * Encapsulates various utilities for windows (ie: <code>Frame</code> and
 * <code>Dialog</code> objects and descendants, in particular).
 *
 * @author Richard Bair
 */
public class Utils {
  /**
   * <p/>
   * Returns the <code>Point</code> at which a window should be placed to
   * center that window on the given desktop.
   * </p>
   * <p/>
   * Some thought was taken as to whether to implement a method such as this,
   * or to simply make a method that, given a window, will center it.  It was
   * decided that it is better to not alter an object within a method.
   * </p>
   *
   * @param window  The window (JInternalFrame) to calculate the center point
   *                for.  This object can not be null.
   *
   * @return the <code>Point</code> at which the window should be placed to
   *         center that window on the given desktop
   */
  public static Point getPointForCentering(JInternalFrame window) {
      try {
          //assert window != null;
          Point mousePoint = MouseInfo.getPointerInfo().getLocation();
          GraphicsDevice[] devices = GraphicsEnvironment
                  .getLocalGraphicsEnvironment().getScreenDevices();
          for (GraphicsDevice device : devices) {
              Rectangle bounds = device.getDefaultConfiguration().getBounds();
              //check to see if the mouse cursor is within these bounds
              if (mousePoint.x >= bounds.x && mousePoint.y >= bounds.y
                  && mousePoint.x <= (bounds.x + bounds.width)
                  && mousePoint.y <= (bounds.y + bounds.height)) {
                  //this is it
                  int screenWidth = bounds.width;
                  int screenHeight = bounds.height;
                  int width = window.getWidth();
                  int height = window.getHeight();
                  return new Point(((screenWidth - width) / 2) + bounds.x,
                                      ((screenHeight - height) / 2) + bounds
                                              .y);
              }
          }
      } catch (Exception e) {
         
      }
      return new Point(0, 0);
  }
}

   
    
    
  

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