plugins/org.eclipse.graphiti.ui/src/org/eclipse/graphiti/ui/internal/util/draw2d/TransparentGhostFigure.java

/*********************************************************************
* Copyright (c) 2005, 2019 SAP SE
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
*    SAP SE - initial API, implementation and documentation
*    mwenz - Bug 352440 - Fixed deprecation warnings - contributed by Felix Velasco
*    mwenz - Bug 373298 - Possible Resource leaks in Graphiti
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.graphiti.ui.internal.util.draw2d;

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.ImageFigure;
import org.eclipse.draw2d.geometry.Insets;

/**
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @noextend This class is not intended to be subclassed by clients.
 */
public class TransparentGhostFigure extends ImageFigure {

	private int alpha;

	public TransparentGhostFigure(int alpha) {
		this.alpha = alpha;
		setOpaque(false);
	}

	@Override
	protected void paintFigure(Graphics graphics) {
		super.paintFigure(graphics);
		graphics.setAlpha(alpha); // fill transparent gray rectangle
		graphics.setBackgroundColor(ColorConstants.lightGray);
		graphics.fillRectangle(getClientArea().getShrinked(new Insets(0, 0, 1, 1)));
		graphics.setAlpha(255); // draw non-transparent dotted rectangle border
		graphics.setLineStyle(Graphics.LINE_DOT);
		graphics.drawRectangle(getClientArea().getShrinked(new Insets(0, 0, 1, 1)));
	}

	public void dispose() {
		if (getImage() != null) {
			getImage().dispose();
		}
	}
}