bundles/org.eclipse.gef/src/org/eclipse/gef/handles/BendpointCreationHandle.java

/*******************************************************************************
 * Copyright (c) 2000, 2010 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.handles;

import org.eclipse.draw2d.Locator;
import org.eclipse.draw2d.MidpointLocator;
import org.eclipse.draw2d.geometry.Dimension;

import org.eclipse.gef.ConnectionEditPart;
import org.eclipse.gef.DragTracker;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.SharedCursors;
import org.eclipse.gef.tools.ConnectionBendpointTracker;

/**
 * A BendpointHandle that is used to create a new bendpoint.
 */
public class BendpointCreationHandle extends BendpointHandle {

	{
		setCursor(SharedCursors.SIZEALL);
		setPreferredSize(new Dimension(DEFAULT_HANDLE_SIZE - 2,
				DEFAULT_HANDLE_SIZE - 2));
	}

	/**
	 * Creates a new BendpointCreationHandle.
	 */
	public BendpointCreationHandle() {
	}

	/**
	 * Creates a new BendpointCreationHandle, sets its owner to
	 * <code>owner</code> and its index to <code>index</code>, and sets its
	 * locator to a new {@link MidpointLocator}.
	 * 
	 * @param owner
	 *            the ConnectionEditPart owner
	 * @param index
	 *            the index
	 */
	public BendpointCreationHandle(ConnectionEditPart owner, int index) {
		setOwner(owner);
		setIndex(index);
		setLocator(new MidpointLocator(getConnection(), index));
	}

	/**
	 * Creates a new BendpointCreationHandle, sets its owner to
	 * <code>owner</code> and its index to <code>index</code>, and sets its
	 * locator to a new {@link MidpointLocator} with the given
	 * <code>locatorIndex</code>.
	 * 
	 * @param owner
	 *            the ConnectionEditPart owner
	 * @param index
	 *            the index
	 * @param locatorIndex
	 *            the locator index
	 */
	public BendpointCreationHandle(ConnectionEditPart owner, int index,
			int locatorIndex) {
		setOwner(owner);
		setIndex(index);
		setLocator(new MidpointLocator(getConnection(), locatorIndex));
	}

	/**
	 * Creates a new BendpointCreationHandle and sets its owner to
	 * <code>owner</code>, sets its index to <code>index</code>, and sets its
	 * locator to <code>locator</code>.
	 * 
	 * @param owner
	 *            the ConnectionEditPart owner
	 * @param index
	 *            the index
	 * @param locator
	 *            the Locator
	 */
	public BendpointCreationHandle(ConnectionEditPart owner, int index,
			Locator locator) {
		setOwner(owner);
		setIndex(index);
		setLocator(locator);
	}

	/**
	 * Creates and returns a new {@link ConnectionBendpointTracker}.
	 * 
	 * @return the new ConnectionBendpointTracker
	 */
	protected DragTracker createDragTracker() {
		ConnectionBendpointTracker tracker;
		tracker = new ConnectionBendpointTracker(
				(ConnectionEditPart) getOwner(), getIndex());
		tracker.setType(RequestConstants.REQ_CREATE_BENDPOINT);
		tracker.setDefaultCursor(getCursor());
		return tracker;
	}

}