plugins/org.eclipse.actf.util.win32/src/org/eclipse/actf/util/win32/AccessibleHilighter.java

/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation and Others
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Takashi ITOH - initial API and implementation
 *******************************************************************************/

package org.eclipse.actf.util.win32;

import org.eclipse.actf.util.win32.impl.DrawUtil;
import org.eclipse.swt.graphics.Rectangle;



public class AccessibleHilighter {

    private static Thread lastThread = null;
    private static final int COLOR_YELLOW = 0x00FFFF;
    private static final int COLOR_GREEN = 0x00FF00;
    private static final int[][] FLASHING_COLORS = { 
        { COLOR_YELLOW, 250 }, { COLOR_GREEN, 250 },
        { COLOR_YELLOW, 250 }, { COLOR_GREEN, 250 }, 
        { COLOR_YELLOW, 250 }, { COLOR_GREEN, 250 },
        { COLOR_YELLOW, 1000 } 
    };

    /**
     * Flash rectangle without using OverlayWindow.
     *
     * Note: This function may leave garbages on the screen.
     * 
     * @param rect
     */
    public static void flashRectangle(final Rectangle rect) {
        if (null != lastThread) {
            lastThread.interrupt();
        }
        if( null != rect ) {
            lastThread = new Thread(new Runnable() {
                public void run() {
                    int hwndDraw = WindowUtil.GetDesktopWindow();
                    try {
                        for( int i=0; i<FLASHING_COLORS.length; i++ ) {
                            DrawUtil.drawRectangle(hwndDraw, rect, FLASHING_COLORS[i][0]);
                            Thread.sleep(FLASHING_COLORS[i][1]);
                        }
                    } catch (InterruptedException e) {
                    }
                    DrawUtil.redrawRectangle(hwndDraw, rect);
                    if (lastThread == Thread.currentThread()) {
                        lastThread = null;
                    }
                }
            });
            lastThread.start();
        }
    }
}