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;
}