Utils.java Source code

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Here is the source code for Utils.java

Source

/*
 * $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.Window;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentListener;

import javax.swing.SwingUtilities;

public class Utils {

    /**
     * Installs/resets a ComponentListener to resize the
     * given window to minWidth/Height if needed.
     *
     * @param window
     * @param minWidth
     * @param minHeight
     */
    public static void setMinimumSizeManager(Window window, int minWidth, int minHeight) {
        ComponentListener[] listeners = window.getComponentListeners();
        ComponentListener listener = null;
        for (ComponentListener l : listeners) {
            if (l instanceof MinSizeComponentListener) {
                listener = l;
                break;
            }
        }
        if (listener == null) {
            window.addComponentListener(new MinSizeComponentListener(window, minWidth, minHeight));
        } else {
            ((MinSizeComponentListener) listener).resetSizes(minWidth, minHeight);
        }
    }

    /**
     * Resets window size to minSize if needed.
     *
     * @author Patrick Wright
     */
    public static class MinSizeComponentListener extends ComponentAdapter {
        private Window window;
        private int minHeight;
        private int minWidth;

        MinSizeComponentListener(Window frame, int minWidth, int minHeight) {
            this.window = frame;
            resetSizes(minWidth, minHeight);
        }

        public void resetSizes(int minWidth, int minHeight) {
            this.minWidth = minWidth;
            this.minHeight = minHeight;
            adjustIfNeeded(window);
        }

        @Override
        public void componentResized(java.awt.event.ComponentEvent evt) {
            adjustIfNeeded((Window) evt.getComponent());
        }

        private void adjustIfNeeded(final Window window) {
            boolean doSize = false;
            int newWidth = window.getWidth();
            int newHeight = window.getHeight();
            if (newWidth < minWidth) {
                newWidth = minWidth;
                doSize = true;
            }
            if (newHeight < minHeight) {
                newHeight = minHeight;
                doSize = true;
            }
            if (doSize) {
                final int w = newWidth;
                final int h = newHeight;
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        window.setSize(w, h);
                    }
                });
            }
        }
    }
}