public override HistoryMemento PerformUndo()
{
HistoryMemento redoMemento = new HistoryMementoDeleteDrawing(metadata, managerId, drawingId, drawingName);
redoMemento.CommandName = commandName;
metadata.DeleteDrawing(managerId, drawingId);
return(redoMemento);
}
public void DeleteHitDrawing()
{
Keyframe keyframe = metadata.HitKeyframe;
AbstractDrawing drawing = metadata.HitDrawing;
if (keyframe == null || drawing == null)
{
return;
}
HistoryMemento memento = new HistoryMementoDeleteDrawing(metadata, keyframe.Id, drawing.Id, drawing.ToolDisplayName);
metadata.DeleteDrawing(keyframe.Id, drawing.Id);
metadata.HistoryStack.PushNewCommand(memento);
}