public void MakeHistory(string id = "")
{
if (!TrackChanges)
{
return;
}
if (id == null)
{
id = "";
}
if (id == "" || id != lastid)
{
UndoBuffer.AddLast(Model.Clone());
RedoBuffer.Clear();
if (UndoBuffer.Count > 100)
{
UndoBuffer.RemoveFirst();
}
UnsavedChanges++;
Device.BeginInvokeOnMainThread(() =>
{
Save.ChangeCanExecute();
Undo.ChangeCanExecute();
Redo.ChangeCanExecute();
});
}
lastid = id;
}
private void Player_HistoryButtonChange(object sender, bool CanUndo, bool CanRedo)
{
Device.BeginInvokeOnMainThread(() =>
{
Undo.ChangeCanExecute();
Redo.ChangeCanExecute();
});
}
public LevelEditModel(OGLContext context)
{
context.Levels.ToAP(0);
Context = context;
Undo = new Command(() =>
{
if (UndoBuffer.Count > 0)
{
lastid = "";
RedoBuffer.AddLast(Model);
Model = UndoBuffer.Last.Value;
UndoBuffer.RemoveLast();
if (UnsavedChanges > 0)
{
UnsavedChanges--;
}
Undo.ChangeCanExecute();
Redo.ChangeCanExecute();
Save.ChangeCanExecute();
bool old = TrackChanges;
TrackChanges = false;
FireModelChanged();
OnPropertyChanged("");
TrackChanges = old;
}
},
() => UndoBuffer.Count > 0);
Redo = new Command(() =>
{
if (RedoBuffer.Count > 0)
{
lastid = "";
UndoBuffer.AddLast(Model);
Model = RedoBuffer.Last.Value;
RedoBuffer.RemoveLast();
UnsavedChanges++;
Undo.ChangeCanExecute();
Redo.ChangeCanExecute();
Save.ChangeCanExecute();
bool old = TrackChanges;
FireModelChanged();
TrackChanges = false;
OnPropertyChanged("");
TrackChanges = old;
}
},
() => RedoBuffer.Count > 0);
Save = new Command(async() =>
{
if (IsBusy)
{
return;
}
IsBusy = true;
await SaveAsync();
IsBusy = false;
}, () => UnsavedChanges > 0);
}
private void Player_HistoryButtonChange(object sender, bool CanUndo, bool CanRedo)
{
Undo.ChangeCanExecute();
Redo.ChangeCanExecute();
}