/// <summary>
/// Return true if the element is the last in the queue
/// </summary>
/// <returns></returns>
public void Undo()
{
if (_undoLines.Count != 0)
{
Tuple <ActionType, ILineModel> line = _undoLines.Pop();
switch (line.Item1)
{
case ActionType.Add:
DeleteLine(line.Item2, false);
LineDeletedSignal.Dispatch(line.Item2.Guid);
break;
case ActionType.Edit:
UpdateLine(line.Item2, false);
LineUpdatedSignal.Dispatch(line.Item2);
break;
case ActionType.Delete:
CreateLine(line.Item2, false);
LineAddedSignal.Dispatch(line.Item2);
break;
}
}
SaveAvailableSignal.Dispatch(_undoLines.Count != 0);
UndoAvailableSignal.Dispatch(_undoLines.Count != 0);
}
private void UpdateLine(ILineModel line, bool undo)
{
ProjectService.UpdateLine((LineModel)line);
if (undo)
{
_undoLines.Push(new Tuple <ActionType, ILineModel>(ActionType.Edit, line));
UndoAvailableSignal.Dispatch(true);
}
else
{
_redoLines.Push(new Tuple <ActionType, ILineModel>(ActionType.Edit, line));
RedoAvailableSignal.Dispatch(true);
}
}
private void DeleteLine(ILineModel line, bool undo)
{
ProjectService.DeleteLine(line.Guid);
if (undo)
{
_undoLines.Push(new Tuple <ActionType, ILineModel>(ActionType.Delete, line));
UndoAvailableSignal.Dispatch(true);
}
else
{
_redoLines.Push(new Tuple <ActionType, ILineModel>(ActionType.Add, line));
RedoAvailableSignal.Dispatch(true);
}
}
private void OnAddLineReceived(ILineModel line)
{
_undoLines.Push(new Tuple <ActionType, ILineModel>(ActionType.Add, line));
UndoAvailableSignal.Dispatch(true);
SaveAvailableSignal.Dispatch(true);
}