// Copyright (c) 1995, 1996 Regents of the University of California.
// All rights reserved.
//
// This software was developed by the Arcadia project
// at the University of California, Irvine.
//
// Redistribution and use in source and binary forms are permitted
// provided that the above copyright notice and this paragraph are
// duplicated in all such forms and that any documentation,
// advertising materials, and other materials related to such
// distribution and use acknowledge that the software was developed
// by the University of California, Irvine.  The name of the
// University may not be used to endorse or promote products derived
// from this software without specific prior written permission.
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
// WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

// File: ActionAlign.java
// Classes: ActionAlign
// Original Author: ics125b spring 1996

package edu.neu.ccs.demeter.tools.apstudio.graphedit;

/** An Action to align 2 or more objects relative to each other. <p>
 * needs-more-work: should add align centers.
 */
public class ActionAlign extends Action 
{
	/** Constants specifying the type of alignment requested
	* These are the class variabls*/

	public static final int ALIGN_TOPS = 0;
	public static final int ALIGN_BOTTOMS = 1;
	public static final int ALIGN_LEFTS = 2;
	public static final int ALIGN_RIGHTS = 3;

	/** Specification of the type of alignment requested */
	private int direction;

	/** Construct a new ActionAlign.
	* @param dir The desired alignment direction, one of the constants
	* listed above. */
	public ActionAlign(int dir,Document d)
	{
		super(d);
		direction = dir;
	}
	
	public String name() { return "Align Objects"; }

	public void doIt()
	{
		Selection sel = _document.selection();
		if (sel.size() > 1)
		{
			sel.startTrans();
			sel.align(direction);
			sel.endTrans();
		}
		_document.gcdNeedsSaving(true);
	}

	public void undoIt() { }

} /* end class ActionAlign */