Copyright (c) 2000, 2008 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ltk.core.refactoring;

import org.eclipse.ltk.core.refactoring.history.IRefactoringExecutionListener;

Listener to monitor state changes of an IUndoManager. 

Clients may implement this interface to listen to undo manger changes.

 As of 3.2 clients which need to examine refactorings which have been performed, undone or redone should use IRefactoringExecutionListener for enhanced functionality. 
Since:
3.0/**
 * Listener to monitor state changes of an {@link IUndoManager}.
 * <p>
 * Clients may implement this interface to listen to undo manger changes.
 * </p>
 * <p>
 * As of 3.2 clients which need to examine refactorings which have been performed, undone or redone should use
 * {@link IRefactoringExecutionListener} for enhanced functionality.
 * </p>
 *
 * @since 3.0
 */
public interface IUndoManagerListener {

	
This method is called by the undo manager if the undo stack has
changed (for example a undo object got added or the undo stack
got flushed).
Params:
manager – the manager this listener is registered to/**
	 * This method is called by the undo manager if the undo stack has
	 * changed (for example a undo object got added or the undo stack
	 * got flushed).
	 *
	 * @param manager the manager this listener is registered to
	 */
	public void undoStackChanged(IUndoManager manager);

	
This method is called by the undo manager if the redo stack has
changed (for example a redo object got added or the redo stack
got flushed).
Params:
manager – the manager this listener is registered to/**
	 * This method is called by the undo manager if the redo stack has
	 * changed (for example a redo object got added or the redo stack
	 * got flushed).
	 *
	 * @param manager the manager this listener is registered to
	 */
	public void redoStackChanged(IUndoManager manager);

	
This method gets called by the undo manager if a change gets
executed in the context of the undo manager.
Params:
manager – the manager this listener is registered to
change – the change to be executed/**
	 * This method gets called by the undo manager if a change gets
	 * executed in the context of the undo manager.
	 *
	 * @param manager the manager this listener is registered to
	 * @param change the change to be executed
	 */
	public void aboutToPerformChange(IUndoManager manager, Change change);

	
This method gets called by the undo manager when a change has
been executed in the context of the undo manager.
Params:
manager – the manager this listener is registered to
change – the change that has been executed/**
	 * This method gets called by the undo manager when a change has
	 * been executed in the context of the undo manager.
	 *
	 * @param manager the manager this listener is registered to
	 * @param change the change that has been executed
	 */
	public void changePerformed(IUndoManager manager, Change change);
}