public void Undo(InkCanvas inkCanvas)
{
if (UndoneOperations.Count > 0)
{
UndoneOperations.Last().Undo(inkCanvas);
if (UndoneOperations.Last().GetUndoRedoOperation() == UndoRedoOperation.AddStroke)
{
AddStrokeOperation aso = UndoneOperations.Last() as AddStrokeOperation;
AddStrokeOperation ason = new AddStrokeOperation(aso.AddedStroke);
AddOperationToRedoneOperations(ason);
}
else if (UndoneOperations.Last().GetUndoRedoOperation() == UndoRedoOperation.EraseStroke)
{
EraseStrokeOperation eso = UndoneOperations.Last() as EraseStrokeOperation;
EraseStrokeOperation eson = new EraseStrokeOperation(eso.ErasedStroke);
AddOperationToRedoneOperations(eson);
}
else if (UndoneOperations.Last().GetUndoRedoOperation() == UndoRedoOperation.DeleteAll)
{
DeleteAllOperation dao = UndoneOperations.Last() as DeleteAllOperation;
DeleteAllOperation daon = new DeleteAllOperation(dao.DeletedStrokes);
AddOperationToRedoneOperations(daon);
}
else if (UndoneOperations.Last().GetUndoRedoOperation() == UndoRedoOperation.EraseByPoint)
{
EraseByPointOperation ebpo = UndoneOperations.Last() as EraseByPointOperation;
EraseByPointOperation ebpon = new EraseByPointOperation(ebpo.StrokesBefore, ebpo.StrokesAfter);
AddOperationToRedoneOperations(ebpon);
}
else
{
}
RemoveLastUndoneOperation();
}
}
public void RemoveLastUndoneOperation()
{
UndoneOperations.Remove(UndoneOperations.Last());
OnPropertyChanged(nameof(CanUndo));
}
public void AddOperationToUndoneOperations(IUndoRedoOperation undoRedoOperation)
{
UndoneOperations.Add(undoRedoOperation);
OnPropertyChanged(nameof(CanUndo));
}
