public void Undo()
{
try
{
_undoInProgress = true;
Debug.WriteLine("UndoRedo Manager Available undo actions count: " + _undoActions.Count);
if (_undoActions.Count == 0)
{
return;
}
object oUndoAction = ListOperations.Pop(_undoActions);
Type undoDataType = oUndoAction.GetType();
if (typeof(UndoTransaction).Equals(undoDataType))
{
StartTransaction(oUndoAction as UndoTransaction);
}
undoDataType.InvokeMember("Execute", BindingFlags.InvokeMethod, null, oUndoAction, null);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
finally
{
_undoInProgress = false;
EndTransaction(_curTran);
}
}
public void PushReverseAction <T>(UndoRedoOperation <T> undoOperation, T undoData)
{
List <IUndoRedoAction> stack = null;
if (_undoInProgress)
{
stack = _redoActions;
}
else
{
stack = _undoActions;
}
if ((!_undoInProgress) && (!_redoInProgress))
{
//_redoActions.Clear();
}
if (_curTran == null)
{
ListOperations.Push(stack, new UndoRedoAction <T>(undoOperation, undoData));
}
else
{
(stack[0] as UndoTransaction).AddUndoRedoOperation(new UndoRedoAction <T>(undoOperation, undoData));
}
if (stack.Count > _maximumActions)
{
stack.RemoveRange(_maximumActions - 1, stack.Count - _maximumActions);
}
}
public void StartTransaction(UndoTransaction tran)
{
if (_curTran == null)
{
_curTran = tran;
ListOperations.Push(_undoActions, new UndoTransaction(tran.Name));
ListOperations.Push(_redoActions, new UndoTransaction(tran.Name));
}
}
public void EndTransaction(UndoTransaction tran)
{
if (_curTran == tran)
{
_curTran = null;
if (_undoActions.Count > 0)
{
UndoTransaction t = _undoActions[0] as UndoTransaction;
if (t != null && t.OperationsCount == 0)
{
ListOperations.Pop(_undoActions);
}
}
if (_redoActions.Count > 0)
{
UndoTransaction t = _redoActions[0] as UndoTransaction;
if (t != null && t.OperationsCount == 0)
{
ListOperations.Pop(_redoActions);
}
}
}
}
