protocol questions

[Giulio Camuffo]

2013/3/30 Matthias Clasen <matthias.clasen at gmail.com>

> Here are a few questions/observations I had while studying the protocol
> docs:
>
> - The use of serials in events seems a bit inconsistent. Most
> wl_pointer events have serials, but axis doesn't. wl_keyboard
> enter/leave events do. wl_data_offer.enter does, but the corresponding
> leave/motion events don't. Is there a rationale for this ?
>
> - Various input events have a time field. The spec doesn't really say
> anything about this. What is it good for, and what units are these -
> monotonic time ?
>

The time can be used to calculate whether two clicks are a double click for
instance. The timestamps are sent by evdev, and i think they are monotonic,
but i'm not sure.


> - It looks like I can't trigger a popup from a key or touch event,
> because set_popup requires a serial that corresponds to an implicit
> pointer grab. That is sad, I like the menu key...
>

Yes, this is a known bug which needs to be addressed.


> - Still on popups, I don't see a way for the client to dismiss the
> popup, or is that handled by just destroying the surface ?
>

I think the only other way apart destroying it is unmapping it, that is
attaching a null buffer to the surface.


>
> - Buffer transformations - fun. How do these relate to each of the
> following ?
>    - resize edges
>    - transient offset
>    - buffer attach x/y
>    - input/opaque/damage regions
>    - surface x/y in motion events
>
> - What is a wl_touch.frame event ? Weston doesn't seem to generate those...
>
> - Various strings in the protocol: title, class, output model/make.
> Are all of these required/known to be UTF-8 ? The class is documented
> as being a file path, which is bad news wrt to encodings...
>
> - The wl_pointer interface seems to be a bit weak wrt to device
> properties. I would at least expect to learn about the number of
> buttons and right-handed vs left-handed, etc.
>
>
> Thanks for any insights you can share about these questions.
>
>
> Matthias
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