Java tutorial
//package com.java2s; /* * Image/J Plugins * Copyright (C) 2002-2008 Jarek Sacha * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Latest release available at http://sourceforge.net/projects/ij-plugins/ * */ import java.awt.*; public class Main { /** * Center window on screen. * * @param window window to be centered. * @param packFrame if <code>true</code> call window's <code>pack()</code> * method before centering. */ public static void centerOnScreen(Window window, boolean packFrame) { //Validate frames that have preset sizes //Pack frames that have useful preferred size info, e.g. from their layout if (packFrame) { window.pack(); } else { window.validate(); } //Center the frame window Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize = window.getSize(); if (frameSize.height > screenSize.height) { frameSize.height = screenSize.height; } if (frameSize.width > screenSize.width) { frameSize.width = screenSize.width; } window.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2); } }