Code review comment for lp:~dandrader/frame/backend

> * Why can't we infer the number of axes from the number of added axes, rather
> than by having to manually set the value. The same for number of touches in
> the frame.

Because it's inefficient. If you add 10 items you will redefine the counter property 10 times.

It also hides the fact that number_of_foo is just a property that can be set independently from the entities they refer to. Besides, the idea of the backend interface is to enable the user to manually and directly build frame data as they will, to feed grail. No real logic expected here. All responsibility is in the hands of the user. The equivalent of a header defining some structs.

> * I understand how events are created, but how are they enqueued to a frame
> instance? How are devices added to a frame instance?

There's no need for a frame instance if you're using the backend interface. The whole point is that you manually create frame events to feed them to grail (through grail_process_frame_event). In that sense, libframe is reduced to being just a header defining some data containers that grail understands.