/* 
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.components.ui.internal.feedback;

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Cursors;
import org.eclipse.draw2d.Polyline;
import org.eclipse.gef.DragTracker;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.handles.SquareHandle;
import org.eclipse.swt.graphics.Color;

/**
 * A handle, used to move points of a polyline or polygon.
 * 
 * @author Sven Wende
 * 
 */
public final class PolyPointHandle extends SquareHandle {
	/**
	 * Index of the polygon point, that should be moved.
	 */
	private int _pointIndex;
	
	/**
	 * The Polyline for this PolyPointHandle.
	 */
	private Polyline _polyline = null;

	/**
	 * Creates a new Handle for the given GraphicalEditPart.
	 * 
	 * @param owner
	 *            owner of the ResizeHandle
	 * @param pointIndex
	 *            index of the polygon point, that should be moved
	 */
	public PolyPointHandle(final GraphicalEditPart owner, final int pointIndex) {
		super();
		if (owner.getFigure() instanceof Polyline) {
			_polyline = (Polyline) owner.getFigure();
		}
		_pointIndex = pointIndex;
		setOwner(owner);

		PolyPointLocator locator = new PolyPointLocator((Polyline) owner
				.getFigure(), pointIndex);
		setLocator(locator);

		setCursor(Cursors.CROSS);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected DragTracker createDragTracker() {
		return new PolyPointDragTracker(getOwner(), _pointIndex);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Color getBorderColor() {
		return ColorConstants.darkGray;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Color getFillColor() {
		return ColorConstants.yellow;
	}
}