private void RedoButton_Click(object sender, RoutedEventArgs e)
{
if (UndoneStrokes.Count == 0)
{
return;
}
Strokes.Add(UndoneStrokes.Last());
UndoneStrokes.Remove(UndoneStrokes.Last());
}
private void UndoButton_Click(object sender, RoutedEventArgs e)
{
if (Strokes == null || Strokes.Count == 0)
{
return;
}
UndoneStrokes.Add(Strokes.ElementAt(Strokes.Count - 1));
Strokes.RemoveAt(Strokes.Count - 1);
}
public void Redo()
{
if (UndoneStrokes.Count == 0)
{
return;
}
lock (StrokesLock)
{
var strokeToRedo = UndoneStrokes.Pop();
Strokes.Add(strokeToRedo);
StrokeCollection.UpdateStroke(strokeToRedo.Id, strokeToRedo);
}
}
public void Undo()
{
lock (StrokesLock)
{
var currentUserLatestStroke = StrokeCollection.GetMergedStrokeMaps()?.FindLast(x => x.AuthorId == UserId);
if (currentUserLatestStroke == null)
{
return;
}
Strokes.Remove(currentUserLatestStroke);
StrokeCollection.UpdateStroke(currentUserLatestStroke.Id, null);
UndoneStrokes.Push(currentUserLatestStroke);
}
}
