JPopupMenuPlus.java

/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is Forte for Java, Community Edition. The Initial
 * Developer of the Original Code is Sun Microsystems, Inc. Portions
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 */

package org.openide.awt;

import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;
import java.awt.Component;
import java.awt.Point;

/** A subclass of JPopupMenu which ensures that the popup menus do
 * not stretch off the edges of the screen.
 *
 */
public class JPopupMenuPlus extends JPopupMenu {
    public JPopupMenuPlus() {
    }

    /*
     * Override the show() method to ensure that the popup will be
     * on the screen.
     */
    public void show(Component invoker, int x, int y) {
        if (isVisible()) {
            return;
        }
        Point p = new Point(x, y);
        SwingUtilities.convertPointToScreen (p, invoker);
        Point newPt = JPopupMenuUtils.getPopupMenuOrigin(this, p);
        SwingUtilities.convertPointFromScreen (newPt, invoker);
        super.show(invoker, newPt.x, newPt.y);
    }
}