/*
 Copyright (c) 1998-2005 The Regents of the University of California
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN  BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY
 */
package diva.graph;

import diva.canvas.interactor.DragInteractor;
import diva.canvas.interactor.SelectionInteractor;
import diva.canvas.interactor.SelectionModel;

/**
 * An interactor for nodes.
 *
 * @author         Michael Shilman
 * @author         John Reekie
 * @version        $Id: NodeInteractor.java 38798 2005-07-08 20:00:01Z cxh $
 * @Pt.AcceptedRating Red
 */
public class NodeInteractor extends SelectionInteractor {
    /** The interactor that drags nodes
     */
    private DragInteractor _nodeDragInteractor;

    /**
     * The graph controller that manages this interactor.
     */
    private GraphController _controller;

    /** Create a new node interactor that belongs to the given
     * controller.
     */
    public NodeInteractor(GraphController controller) {
        super();
        _controller = controller;
        setDragInteractor(new NodeDragInteractor(controller));
    }

    /** Create a new node interactor that belongs to the given
     * controller and that uses the given selection model
     */
    public NodeInteractor(GraphController controller, SelectionModel sm) {
        this(controller);
        super.setSelectionModel(sm);
    }

    /** Get the interactor that drags nodes
     */
    public DragInteractor getDragInteractor() {
        return _nodeDragInteractor;
    }

    /** Return the graph controller that manages this interactor.
     */
    public GraphController getGraphController() {
        return _controller;
    }

    /** Set the interactor that drags nodes
     */
    public void setDragInteractor(DragInteractor i) {
        if (_nodeDragInteractor != null) {
            removeInteractor(_nodeDragInteractor);
        }

        if (i != null) {
            addInteractor(i);
        }

        _nodeDragInteractor = i;
    }
}