org.eclipse.mylyn.tasks.ui/src/org/eclipse/mylyn/internal/tasks/ui/CompositeContainerImageDescriptor.java

/*******************************************************************************
 * Copyright (c) 2006 - 2006 Mylar eclipse.org project 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:
 *     Mylar project committers - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylar.internal.tasks.ui;

import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;

/**
 * @author Mik Kersten
 */
public class CompositeContainerImageDescriptor extends CompositeImageDescriptor {

	private ImageData base;
	
	private ImageData overlay;
	
	protected Point size;
	
	public CompositeContainerImageDescriptor(ImageDescriptor icon, ImageDescriptor overlay) {
		this.base = getImageData(icon);
		if (overlay != null) {
			this.overlay = getImageData(overlay);
		}
		this.size = new Point(CompositeTaskImageDescriptor.WIDTH, base.height);
	}
	
	@Override
	protected void drawCompositeImage(int width, int height) {
		drawImage(base, 0, 0);
		if (overlay != null) {
			drawImage(overlay, base.width+2, 0);
		}
	}

	private ImageData getImageData(ImageDescriptor descriptor) {
		ImageData data = descriptor.getImageData(); 
		// see bug 51965: getImageData can return null
		if (data == null) {
			data = DEFAULT_IMAGE_DATA;
		}
		return data;
	}

	@Override
	protected Point getSize() {
		return new Point(size.x, size.y);
	}
}