GraphCanvasSelectionListener.java

/*
 * Copyright (C) 2012 Jason Gedge <http://www.gedge.ca>
 *
 * This file is part of the OpGraph project.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package ca.gedge.opgraph.app.components.canvas;

import java.util.Collection;

import ca.gedge.opgraph.OpNode;

/**
 * An interface for classes that want to listen to selection events fired
 * from a {@link GraphCanvasSelectionModel}.
 */
public interface GraphCanvasSelectionListener {
	/**
	 * Called when the node selection state is changed in a {@link GraphCanvas}.
	 * 
	 * @param old  the previously selected nodes
	 * @param selected  the selected nodes
	 */
	public abstract void nodeSelectionChanged(Collection<OpNode> old, Collection<OpNode> selected);
}