create Popup - Java Swing

Java examples for Swing:JPopupMenu

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Description

create Popup

Demo Code

/*//from ww  w  . j  a  v  a 2 s  .  c  o  m
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
 * 
 * The contents of this file are subject to the terms of the GNU General Public License Version 3
 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each file.
 */
//package com.java2s;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import javax.swing.Popup;
import javax.swing.PopupFactory;

public class Main {
    public static Popup createPopup(Component invoker, Component content,
            int x, int y) {
        Point p = adjustPopupLocationToFitScreen(invoker,
                content.getPreferredSize(), x, y);
        return PopupFactory.getSharedInstance().getPopup(invoker, content,
                p.x, p.y);
    }

    static Point adjustPopupLocationToFitScreen(Component invoker,
            Dimension preferredSize, int xposition, int yposition) {
        Point p = new Point(xposition, yposition);

        if (GraphicsEnvironment.isHeadless())
            return p;

        Toolkit toolkit = Toolkit.getDefaultToolkit();
        Rectangle screenBounds;
        Insets screenInsets;
        GraphicsConfiguration gc = null;
        // Try to find GraphicsConfiguration, that includes mouse
        // pointer position
        GraphicsEnvironment ge = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        GraphicsDevice[] gd = ge.getScreenDevices();
        for (int i = 0; i < gd.length; i++) {
            if (gd[i].getType() == GraphicsDevice.TYPE_RASTER_SCREEN) {
                GraphicsConfiguration dgc = gd[i].getDefaultConfiguration();
                if (dgc.getBounds().contains(p)) {
                    gc = dgc;
                    break;
                }
            }
        }

        // If not found and we have invoker, ask invoker about his gc
        if (gc == null && invoker != null) {
            gc = invoker.getGraphicsConfiguration();
        }

        if (gc != null) {
            // If we have GraphicsConfiguration use it to get
            // screen bounds and insets
            screenInsets = toolkit.getScreenInsets(gc);
            screenBounds = gc.getBounds();
        } else {
            // If we don't have GraphicsConfiguration use primary screen
            // and empty insets
            screenInsets = new Insets(0, 0, 0, 0);
            screenBounds = new Rectangle(toolkit.getScreenSize());
        }

        int scrWidth = screenBounds.width
                - Math.abs(screenInsets.left + screenInsets.right);
        int scrHeight = screenBounds.height
                - Math.abs(screenInsets.top + screenInsets.bottom);

        Dimension size;

        size = preferredSize;

        // Use long variables to prevent overflow
        long pw = (long) p.x + (long) size.width;
        long ph = (long) p.y + (long) size.height;

        if (pw > screenBounds.x + scrWidth)
            p.x = screenBounds.x + scrWidth - size.width;

        if (ph > screenBounds.y + scrHeight)
            p.y = screenBounds.y + scrHeight - size.height;

        /* Change is made to the desired (X,Y) values, when the
           PopupMenu is too tall OR too wide for the screen
         */
        if (p.x < screenBounds.x)
            p.x = screenBounds.x;
        if (p.y < screenBounds.y)
            p.y = screenBounds.y;

        return p;
    }
}

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