Get Point For Centering
/*
* $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.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
/**
* Encapsulates various utilities for windows (ie: <code>Frame</code> and
* <code>Dialog</code> objects and descendants, in particular).
*
* @author Richard Bair
*/
public class Utils {
public static Point getPointForCentering(Window window) {
Rectangle usableBounds = getUsableDeviceBounds(window);
int screenWidth = usableBounds.width;
int screenHeight = usableBounds.height;
int width = window.getWidth();
int height = window.getHeight();
return new Point(((screenWidth - width) / 2) + usableBounds.x,
((screenHeight - height) / 2) + usableBounds.y);
}
/**
* <p>
* Returns the <code>Point</code> at which a window should be placed to
* center that window on the screen.
* </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 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 screen.
*/
private static Rectangle getUsableDeviceBounds(Window window) {
Window owner = window.getOwner();
GraphicsConfiguration gc = null;
if (owner == null) {
gc = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice().getDefaultConfiguration();
} else {
gc = owner.getGraphicsConfiguration();
}
Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);
Rectangle bounds = gc.getBounds();
bounds.x += insets.left;
bounds.y += insets.top;
bounds.width -= (insets.left + insets.right);
bounds.height -= (insets.top + insets.bottom);
return bounds;
}
}
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