/*******************************************************************************
 * Copyright (c) 2000, 2005 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.gef.examples.flow.policies;

import org.eclipse.swt.graphics.Color;

import org.eclipse.draw2d.IFigure;

import org.eclipse.gef.EditPart;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.editpolicies.GraphicalEditPolicy;

/**
 * @author Daniel Lee
 */
public class ActivityContainerHighlightEditPolicy extends GraphicalEditPolicy {

private Color revertColor;
private static Color highLightColor = new Color(null, 200, 200, 240);

/**
 * @see org.eclipse.gef.EditPolicy#eraseTargetFeedback(org.eclipse.gef.Request)
 */
public void eraseTargetFeedback(Request request) {
	if (revertColor != null) {
		setContainerBackground(revertColor);
		revertColor = null;
	}
}

private Color getContainerBackground() {
	return getContainerFigure().getBackgroundColor();
}

private IFigure getContainerFigure() {
	return ((GraphicalEditPart)getHost()).getFigure();
}

/**
 * @see org.eclipse.gef.EditPolicy#getTargetEditPart(org.eclipse.gef.Request)
 */
public EditPart getTargetEditPart(Request request) {
	return request.getType().equals(RequestConstants.REQ_SELECTION_HOVER)
		? getHost() : null;
}

private void setContainerBackground(Color c) {
	getContainerFigure().setBackgroundColor(c);
}

/**
 * Changes the background color of the container to the highlight color
 */
protected void showHighlight() {
	if (revertColor == null) {
		revertColor = getContainerBackground();
		setContainerBackground(highLightColor);
	}
}

/**
 * @see org.eclipse.gef.EditPolicy#showTargetFeedback(org.eclipse.gef.Request)
 */
public void showTargetFeedback(Request request) {
	if (request.getType().equals(RequestConstants.REQ_CREATE)
		|| request.getType().equals(RequestConstants.REQ_ADD))
		showHighlight();
}

}