ScenarioContainerHighlightEditPolicy.java

/*
 * Copyright 2005 Pi4 Technologies Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *
 * Change History:
 * Jul 7, 2005 : Initial version created by gary
 */
package org.savara.tools.scenario.designer.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;

/**
 * This class implements the highlight edit policy.
 */
public class ScenarioContainerHighlightEditPolicy
				extends GraphicalEditPolicy {

	/**
	 * @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();
	}

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