private void ClearRedoStack()
{
if (InternalRedoStack.Count > 0)
{
InternalRedoStack.Clear();
OnPropertyChanged(new PropertyChangedEventArgs("CanRedo"));
}
}
void EnforceSizeLimit()
{
AssertNoUndoGroupOpen();
while (InternalUndoStack.Count > _sizeLimit)
{
InternalUndoStack.DequeueTail();
}
while (InternalRedoStack.Count > _sizeLimit)
{
InternalRedoStack.DequeueTail();
}
}
/// <summary>
/// Redoes the last undone operation.
/// </summary>
public void Redo()
{
AssertNoUndoGroupOpen();
if (InternalRedoStack.Count > 0)
{
IUndoableOperation operation = InternalRedoStack.DequeueHead();
InternalUndoStack.EnqueueHead(operation);
operation.Do();
OnOperationRedone();
if (InternalRedoStack.Count == 0)
{
OnPropertyChanged(new PropertyChangedEventArgs("CanRedo"));
}
if (InternalUndoStack.Count == 1)
{
OnPropertyChanged(new PropertyChangedEventArgs("CanUndo"));
}
EnforceSizeLimit();
}
}