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/*******************************************************************************
* Copyright (c) 2000, 2006 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.decorators;
import java.util.*;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.DecorationOverlayIcon;
import org.eclipse.swt.graphics.*;
/**
* The OverlayCache is a helper class used by the DecoratorManger
* to manage the lifecycle of overlaid images.
*/
class OverlayCache {
private Map cache = new HashMap(); /*from OverlayIcon to Image*/
/**
* Returns and caches an image corresponding to the specified icon.
* @param icon the icon
* @return the image
*/
Image getImageFor(DecorationOverlayIcon icon) {
Image image = (Image) cache.get(icon);
if (image == null) {
image = icon.createImage();
cache.put(icon, image);
}
return image;
}
/**
* Disposes of all images in the cache.
*/
void disposeAll() {
for (Iterator it = cache.values().iterator(); it.hasNext();) {
Image image = (Image) it.next();
image.dispose();
}
cache.clear();
}
/**
* Apply the descriptors for the receiver to the supplied
* image.
* @param source
* @param descriptors
* @return Image
*/
Image applyDescriptors(Image source, ImageDescriptor[] descriptors) {
Rectangle bounds = source.getBounds();
Point size = new Point(bounds.width, bounds.height);
DecorationOverlayIcon icon = new DecorationOverlayIcon(source,
descriptors, size);
return getImageFor(icon);
}
}
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