////////////////////////////////////////////////////////////////////////////////
//
//  Licensed to the Apache Software Foundation (ASF) under one or more
//  contributor license agreements.  See the NOTICE file distributed with
//  this work for additional information regarding copyright ownership.
//  The ASF licenses this file to You under the Apache License, Version 2.0
//  (the "License"); you may not use this file except in compliance with
//  the License.  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
package flashx.undo
{
	/** 
	 * IOperation defines the interface for operations that can be undone and redone.
	 *  
	 * @playerversion Flash 10
	 * @playerversion AIR 1.5
 	 * @langversion 3.0
	 */
	public interface IOperation
	{
		/** 
		 * Reperforms the operation.
		 * 
		 * <p>The operation is also responsible for pushing itself onto the undo stack.</p>
		 *  
		 * @playerversion Flash 10
		 * @playerversion AIR 1.5
	 	 * @langversion 3.0
		 */
		function performRedo():void;
		/** 
		 * Reverses the operation.
		 * 
		 * <p>The operation is also responsible for pushing itself onto the redo stack.</p> 
		 * 
		 * @playerversion Flash 10
		 * @playerversion AIR 1.5
	 	 * @langversion 3.0
		 */
		function performUndo():void;
	}
}