Returns a point where the given popup menu should be shown. - Java Swing

Java examples for Swing:JPopupMenu

  1. HOME
  2. Java
  3. Swing
  4. JPopupMenu

Description

Returns a point where the given popup menu should be shown.

Demo Code

/**/*from  w w  w.j a  v a 2s.  c om*/
 * $RCSfile$
 * $Revision: 128 $
 * $Date: 2004-10-25 20:42:00 -0300 (Mon, 25 Oct 2004) $
 *
 * Copyright (C) 2004-2008 Jive Software. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import java.awt.*;
import java.awt.event.MouseEvent;

import javax.swing.*;

public class Main {
    /**
     * Returns a point where the given popup menu should be shown. The
     * point is calculated by adjusting the X and Y coordinates from the
     * given mouse event so that the popup menu will not be clipped by
     * the screen boundaries.
     *
     * @param popup the popup menu
     * @param event the mouse event
     * @return the point where the popup menu should be shown
     */
    public static Point getPopupMenuShowPoint(JPopupMenu popup,
            MouseEvent event) {
        Component source = (Component) event.getSource();
        Point topLeftSource = source.getLocationOnScreen();
        Point ptRet = getPopupMenuShowPoint(popup,
                topLeftSource.x + event.getX(),
                topLeftSource.y + event.getY());
        ptRet.translate(-topLeftSource.x, -topLeftSource.y);
        return ptRet;
    }

    /**
     * Returns a point where the given popup menu should be shown. The
     * point is calculated by adjusting the X and Y coordinates so that
     * the popup menu will not be clipped by the screen boundaries.
     *
     * @param popup the popup menu
     * @param x     the x position in screen coordinate
     * @param y     the y position in screen coordinates
     * @return the point where the popup menu should be shown in screen
     *         coordinates
     */
    public static Point getPopupMenuShowPoint(JPopupMenu popup, int x, int y) {
        Dimension sizeMenu = popup.getPreferredSize();
        Point bottomRightMenu = new Point(x + sizeMenu.width, y
                + sizeMenu.height);

        Rectangle[] screensBounds = getScreenBounds();
        int n = screensBounds.length;
        for (int i = 0; i < n; i++) {
            Rectangle screenBounds = screensBounds[i];
            if (screenBounds.x <= x
                    && x <= (screenBounds.x + screenBounds.width)) {
                Dimension sizeScreen = screenBounds.getSize();
                sizeScreen.height -= 32; // Hack to help prevent menu being clipped by Windows/Linux/Solaris Taskbar.

                int xOffset = 0;
                if (bottomRightMenu.x > (screenBounds.x + sizeScreen.width))
                    xOffset = -sizeMenu.width;

                int yOffset = 0;
                if (bottomRightMenu.y > (screenBounds.y + sizeScreen.height))
                    yOffset = sizeScreen.height - bottomRightMenu.y;

                return new Point(x + xOffset, y + yOffset);
            }
        }

        return new Point(x, y); // ? that would mean that the top left point was not on any screen.
    }

    public static Rectangle[] getScreenBounds() {
        GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        final GraphicsDevice[] screenDevices = graphicsEnvironment
                .getScreenDevices();
        Rectangle[] screenBounds = new Rectangle[screenDevices.length];
        for (int i = 0; i < screenDevices.length; i++) {
            GraphicsDevice screenDevice = screenDevices[i];
            final GraphicsConfiguration defaultConfiguration = screenDevice
                    .getDefaultConfiguration();
            screenBounds[i] = defaultConfiguration.getBounds();
        }

        return screenBounds;
    }
}

Related Tutorials