public IObservable <HistoryEntry> Record(HistoryEntry entry, Func <HistoryEntry, IObservable <HistoryEntry> > execute)
{
StackRedo.Clear();
UpdateSubjects(true);
return(execute(entry).Do(updatedEntry =>
{
StackUndo.Push(updatedEntry);
UpdateSubjects();
}));
}
public IObservable <HistoryEntry> Redo(Func <HistoryEntry, IObservable <HistoryEntry> > execute)
{
if (StackRedo.Count == 0)
{
throw new Exception();
}
UpdateSubjects(true);
return(execute(StackRedo.Pop()).Do(entry =>
{
StackUndo.Push(entry);
UpdateSubjects();
}));
}