/*
This file is part of the algoviz@vt collection of algorithm
visualizations.

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 distribution. If not, see
<http://www.gnu.org/licenses/>.
*/

package splayTree;

/**
 * This class just holds which VirtualState in the current VirtualStateCollection this step refers to
 *
 * @author Andy Street, alstreet@vt.edu
 * @version Apr 22, 2009
 *
 */
public class ChangeState extends State
{

	private int stateNumber;
	private VirtualStateCollection vt;
	
	public ChangeState(VirtualState s, VirtualStateCollection vt, Operation o, String text)
	{
		super(o, text);
		
		this.stateNumber = vt.addState(s);
		this.vt = vt;
	}
	
	/**
	 * @see avl.State#onStateFocused(avl.TreePanel)
	 */
	@Override
	public void onStateFocused(TreePanel tp, boolean goingForward)
	{
		if(goingForward)
			vt.animate(tp, stateNumber, stateNumber + 1);
		else
			vt.animate(tp, stateNumber + 1, stateNumber);
	}

	/**
	 * @see avl.State#onStateUnfocused(avl.TreePanel)
	 */
	@Override
	public void onStateUnfocused(TreePanel tp)
	{
	}
	
	/**
	 * Draws this state.  If prev is true, it will draw the state it would
	 * animate from when going forward, otherwise it will draw the state it would
	 * animate to.
	 * 
	 * @see avl.State#draw(avl.TreePanel)
	 */
	@Override
	public void draw(TreePanel tp, boolean prev)
	{
		vt.animate(tp, stateNumber + (prev ? 0 : 1), stateNumber + (prev ? 0 : 1));
	}
	
        @Override
        public String toString(){
            String temp=stateNumber + "" + super.getText();
            return temp;
        }


}