Java example source code file (WTrayIconPeer.java)

This example Java source code file (WTrayIconPeer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, bufferedimage, frame, iconobserver, image, imageobserver, integercomponentraster, point, popupmenu, popupmessagewindow, runnable, string, tray_icon_height, tray_icon_mask_size, tray_icon_width, window, wtrayiconpeer

The WTrayIconPeer.java Java example source code

/*
 * Copyright (c) 2005, 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.awt.windows;

import java.awt.Graphics2D;
import java.awt.AWTEvent;
import java.awt.Frame;
import java.awt.PopupMenu;
import java.awt.Point;
import java.awt.TrayIcon;
import java.awt.Image;
import java.awt.peer.TrayIconPeer;
import java.awt.image.*;
import sun.awt.SunToolkit;
import sun.awt.image.IntegerComponentRaster;
import sun.awt.windows.WPopupMenuPeer;

public class WTrayIconPeer extends WObjectPeer implements TrayIconPeer {
    final static int TRAY_ICON_WIDTH = 16;
    final static int TRAY_ICON_HEIGHT = 16;
    final static int TRAY_ICON_MASK_SIZE = (TRAY_ICON_WIDTH * TRAY_ICON_HEIGHT) / 8;

    IconObserver observer = new IconObserver();
    boolean firstUpdate = true;
    Frame popupParent = new Frame("PopupMessageWindow");
    PopupMenu popup;

    protected void disposeImpl() {
        if (popupParent != null) {
            popupParent.dispose();
        }
        popupParent.dispose();
        _dispose();
        WToolkit.targetDisposedPeer(target, this);
    }

    WTrayIconPeer(TrayIcon target) {
        this.target = target;
        popupParent.addNotify();
        create();
        updateImage();
    }

    public void updateImage() {
        Image image = ((TrayIcon)target).getImage();
        if (image != null) {
            updateNativeImage(image);
        }
    }

    public native void setToolTip(String tooltip);

    public synchronized void showPopupMenu(final int x, final int y) {
        if (isDisposed())
            return;

        SunToolkit.executeOnEventHandlerThread(target, new Runnable() {
                public void run() {
                    PopupMenu newPopup = ((TrayIcon)target).getPopupMenu();
                    if (popup != newPopup) {
                        if (popup != null) {
                            popupParent.remove(popup);
                        }
                        if (newPopup != null) {
                            popupParent.add(newPopup);
                        }
                        popup = newPopup;
                    }
                    if (popup != null) {
                        ((WPopupMenuPeer)popup.getPeer()).show(popupParent, new Point(x, y));
                    }
                }
            });
    }

    public void displayMessage(String caption, String text, String messageType) {
        // The situation when both caption and text are null is processed in the shared code.
        if (caption == null) {
            caption = "";
        }
        if (text == null) {
            text = "";
        }
        _displayMessage(caption, text, messageType);
    }


    // ***********************************************
    // ***********************************************


    synchronized void updateNativeImage(Image image) {
        if (isDisposed())
            return;

        boolean autosize = ((TrayIcon)target).isImageAutoSize();

        BufferedImage bufImage = new BufferedImage(TRAY_ICON_WIDTH, TRAY_ICON_HEIGHT,
                                                   BufferedImage.TYPE_INT_ARGB);
        Graphics2D gr = bufImage.createGraphics();
        if (gr != null) {
            try {
                gr.setPaintMode();

                gr.drawImage(image, 0, 0, (autosize ? TRAY_ICON_WIDTH : image.getWidth(observer)),
                             (autosize ? TRAY_ICON_HEIGHT : image.getHeight(observer)), observer);

                createNativeImage(bufImage);

                updateNativeIcon(!firstUpdate);
                if (firstUpdate) firstUpdate = false;

            } finally {
                gr.dispose();
            }
        }
    }

    void createNativeImage(BufferedImage bimage) {
        Raster raster = bimage.getRaster();
        byte[] andMask = new byte[TRAY_ICON_MASK_SIZE];
        int  pixels[] = ((DataBufferInt)raster.getDataBuffer()).getData();
        int npixels = pixels.length;
        int ficW = raster.getWidth();

        for (int i = 0; i < npixels; i++) {
            int ibyte = i / 8;
            int omask = 1 << (7 - (i % 8));

            if ((pixels[i] & 0xff000000) == 0) {
                // Transparent bit
                if (ibyte < andMask.length) {
                    andMask[ibyte] |= omask;
                }
            }
        }

        if (raster instanceof IntegerComponentRaster) {
            ficW = ((IntegerComponentRaster)raster).getScanlineStride();
        }
        setNativeIcon(((DataBufferInt)bimage.getRaster().getDataBuffer()).getData(),
                      andMask, ficW, raster.getWidth(), raster.getHeight());
    }

    void postEvent(AWTEvent event) {
        WToolkit.postEvent(WToolkit.targetToAppContext(target), event);
    }

    native void create();
    synchronized native void _dispose();

    /*
     * Updates/adds the icon in/to the system tray.
     * @param doUpdate if <code>true, updates the icon,
     * otherwise, adds the icon
     */
    native void updateNativeIcon(boolean doUpdate);

    native void setNativeIcon(int[] rData, byte[] andMask, int nScanStride,
                              int width, int height);

    native void _displayMessage(String caption, String text, String messageType);

    class IconObserver implements ImageObserver {
        public boolean imageUpdate(Image image, int flags, int x, int y, int width, int height) {
            if (image != ((TrayIcon)target).getImage() || // if the image has been changed
                isDisposed())
            {
                return false;
            }
            if ((flags & (ImageObserver.FRAMEBITS | ImageObserver.ALLBITS |
                          ImageObserver.WIDTH | ImageObserver.HEIGHT)) != 0)
            {
                updateNativeImage(image);
            }
            return (flags & ImageObserver.ALLBITS) == 0;
        }
    }
}