/*******************************************************************************
* Copyright (c) 2012 xored software, Inc.
* 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:
* xored software, Inc. - initial API and implementation (Yuri Strot)
******************************************************************************/
package com.xored.glance.internal.ui.panels;
import java.net.URL;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
import com.xored.glance.internal.ui.GlancePlugin;
import com.xored.glance.ui.utils.UIUtils;
public abstract class ImageAnimation extends Thread {
public ImageAnimation(URL url, Color bg) throws CoreException {
setDaemon(true);
this.bg = bg;
try {
imageDataArray = loader.load(url.openStream());
} catch (Exception e) {
throw new CoreException(GlancePlugin.createStatus(
"Can't read image '" + url.toString() + "'", e));
}
if (imageDataArray == null || imageDataArray.length <= 1) {
throw new CoreException(GlancePlugin.createStatus("Image '"
+ url.toString() + "' is not an animated image"));
}
}
@Override
public void run() {
Display display = PlatformUI.getWorkbench().getDisplay();
/*
* Create an off-screen image to draw on, and fill it with the shell
* background.
*/
final Image offScreenImage = new Image(display,
loader.logicalScreenWidth, loader.logicalScreenHeight);
GC offScreenImageGC = new GC(offScreenImage);
offScreenImageGC.setBackground(bg);
offScreenImageGC.fillRectangle(0, 0, loader.logicalScreenWidth,
loader.logicalScreenHeight);
Image image = null;
try {
/* Create the first image and draw it on the off-screen image. */
int imageDataIndex = 0;
ImageData imageData = imageDataArray[imageDataIndex];
image = new Image(display, imageData);
offScreenImageGC.drawImage(image, 0, 0, imageData.width,
imageData.height, imageData.x, imageData.y,
imageData.width, imageData.height);
/*
* Now loop through the images, creating and drawing each one on the
* off-screen image before drawing it on the shell.
*/
int repeatCount = loader.repeatCount;
while ((loader.repeatCount == 0 || repeatCount > 0)
&& !isTerminated()) {
switch (imageData.disposalMethod) {
case SWT.DM_FILL_BACKGROUND:
/* Fill with the background color before drawing. */
offScreenImageGC.setBackground(bg);
offScreenImageGC.fillRectangle(imageData.x, imageData.y,
imageData.width, imageData.height);
break;
case SWT.DM_FILL_PREVIOUS:
/* Restore the previous image before drawing. */
offScreenImageGC.drawImage(image, 0, 0, imageData.width,
imageData.height, imageData.x, imageData.y,
imageData.width, imageData.height);
break;
}
imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
imageData = imageDataArray[imageDataIndex];
image.dispose();
image = new Image(display, imageData);
offScreenImageGC.drawImage(image, 0, 0, imageData.width,
imageData.height, imageData.x, imageData.y,
imageData.width, imageData.height);
final Image newImage = image;
UIUtils.syncExec(display, new Runnable() {
public void run() {
updateImage(newImage);
}
});
/*
* Sleep for the specified delay time (adding commonly-used
* slow-down fudge factors).
*/
try {
int ms = imageData.delayTime * 10;
if (ms < 20)
ms += 30;
if (ms < 30)
ms += 10;
Thread.sleep(ms);
} catch (InterruptedException e) {
}
/*
* If we have just drawn the last image, decrement the repeat
* count and start again.
*/
if (imageDataIndex == imageDataArray.length - 1)
repeatCount--;
}
} catch (SWTException ex) {
GlancePlugin.log("There was an error animating the GIF", ex);
} finally {
if (offScreenImage != null && !offScreenImage.isDisposed())
offScreenImage.dispose();
if (offScreenImageGC != null && !offScreenImageGC.isDisposed())
offScreenImageGC.dispose();
if (image != null && !image.isDisposed())
image.dispose();
}
}
protected abstract boolean isTerminated();
protected abstract void updateImage(Image image);
private final ImageLoader loader = new ImageLoader();
private ImageData[] imageDataArray;
private final Color bg;
}