Possible bug with input handling

[Christopher Michael]

On 12/08/11 10:14, Tiago Vignatti wrote:
> Hi, sorry for late reply.
>
> On 11/29/2011 08:30 PM, Christopher Michael wrote:
>>
>> I found an issue while working on some local code, that may be a bug in
>> the input handling of Wayland.
>>
>> In my function to process button events (from mouse), the 'btn'
>> parameter that gets returned to my handler seems incorrect for Wheel
>> Events.
>>
>> Basically, mouse wheel down events are coming in as BTN_EXTRA, and mouse
>> wheel up events are coming in as BTN_SIDE. This seems incorrect to me :/
>> In my opinion, these should be perhaps BTN_FORWARD/BTN_BACK or maybe
>> BTN_GEAR_DOWN/BTN_GEAR_UP.
>>
>> In <linux/input.h> there resides a BTN_WHEEL value ... perhaps that
>> should be used for the returned 'btn' parameter, and the 'state'
>> parameter could be set to BTN_GEAR_UP/DOWN ?? It would make more sense
>> imo. Here is some short 'pseudo' code to illustrate what I mean.
>>
>> _cb_handle_button(void *data, struct wl_input_device *dev, uint32_t t,
>> uint32_t btn, uint32_t state)
>> {
>> if (btn == BTN_WHEEL)
>> {
>> if (state == BTN_GEAR_DOWN)
>> printf("Mouse Wheel Scrolled Down\n");
>> else if (state == BTN_GEAR_UP)
>> printf("Mouse Wheel Scrolled Up\n");
>> }
>> }
>>
>> As I am fairly new to Wayland, I am not sure where the issue actually
>> resides or what the proper fix would be, so I cannot provide a patch to
>> fix it :/
>
> BTN_WHEEL event is quite bizarre because it doesn't seem to be forwarded
> by any device. Are you using X11 or drm compositor btw? Can you run
> evtest [0] and show the output when you scroll up/down?
>
> [0] http://cgit.freedesktop.org/evtest/
>
> Tiago

I am using the X11 compositor. Here is the output from evtest when 
scrolling up/down on the wheel:

http://imgur.com/IPhPT

devilhorns