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/*******************************************************************************
* Copyright (c) 2007, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Friederike Schertel <friederike@schertel.org> - Bug 478336
******************************************************************************/
package org.eclipse.ui.internal;
import org.eclipse.core.runtime.IStatus;
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.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.internal.misc.StatusUtil;
import org.eclipse.ui.statushandlers.StatusManager;
/**
* Base class for Cyclic animations.
*
* @since 3.3
*
*/
public abstract class ImageCycleFeedbackBase extends AnimationFeedbackBase {
protected Image[] images;
protected Image stoppedImage;
private Image offScreenImage;
private GC offScreenImageGC;
private int imageDataIndex;
private Image image;
private ImageData imageData;
protected Display display;
protected Color background;
/**
* @param parentShell
*/
public ImageCycleFeedbackBase(Shell parentShell) {
super(parentShell);
// TODO Auto-generated constructor stub
}
/**
*
* @param parentShell
* @param images : an array of images
*/
public ImageCycleFeedbackBase(Shell parentShell, Image[] images) {
super(parentShell);
this.images = images;
}
/**
* Set the image during progress without caching.
*
* @param image
*/
public abstract void showImage(Image image);
/**
* Save initial Image which would be stoppedImage
*
*/
public abstract void saveStoppedImage();
/**
* Set the stopped Image upon animation completion
*
* @param image
*/
public abstract void setStoppedImage(Image image);
@Override
public void dispose() {
if (stoppedImage == null || stoppedImage.isDisposed())
return;
setStoppedImage(stoppedImage);
if (offScreenImageGC != null && !offScreenImageGC.isDisposed())
offScreenImageGC.dispose();
if (offScreenImage != null && !offScreenImage.isDisposed())
offScreenImage.dispose();
}
@Override
public boolean jobInit(AnimationEngine engine) {
return super.jobInit(engine);
}
@Override
public void renderStep(AnimationEngine engine) {
if (offScreenImage == null) {
offScreenImage = getOffscreenImage();
}
try {
imageDataIndex = (imageDataIndex + 1) % images.length;
image = images[imageDataIndex];
imageData = image.getImageData();
offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height, imageData.x, imageData.y,
imageData.width, imageData.height);
final Image finalImage = image;
display.syncExec(() -> showImage(finalImage));
/*
* Sleep for the specified delay time (adding commonly-used slow-down fudge
* factors).
*/
// try {
// Thread.sleep(30);
// } catch (InterruptedException e) {
// }
if (images == null)
return;
} catch (SWTException ex) {
IStatus status = StatusUtil.newStatus(WorkbenchPlugin.PI_WORKBENCH, ex);
StatusManager.getManager().handle(status);
}
}
private Image getOffscreenImage() {
saveStoppedImage();
imageDataIndex = 0;
image = images[imageDataIndex];
imageData = image.getImageData();
/*
* Create an off-screen image to draw on, and fill it with the shell background.
*/
offScreenImage = new Image(display, imageData.width, imageData.height);
offScreenImageGC = new GC(offScreenImage);
offScreenImageGC.setBackground(background);
offScreenImageGC.fillRectangle(0, 0, imageData.width, imageData.height);
/*
* Create the first image and draw it on the off-screen image.
*/
offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height, imageData.x, imageData.y,
imageData.width, imageData.height);
return offScreenImage;
}
}
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