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evdev: Provide the relative pointer motion event deltas

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Compositors need more detailed information about motion events. Make it
possible to retrieve this information when running the evdev backend by
adding the information to the backend specific event struct.

https://bugzilla.gnome.org/show_bug.cgi?id=752752
This commit is contained in:
Jonas Ådahl
2015-12-02 12:17:23 +08:00
parent a10200509e
commit a598917e07
4 changed files with 110 additions and 15 deletions
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59
clutter/evdev/clutter-event-evdev.c
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@ -32,6 +32,12 @@ typedef struct _ClutterEventEvdev ClutterEventEvdev;
struct _ClutterEventEvdev
{
guint32 evcode;
gboolean has_relative_motion;
double dx;
double dy;
double dx_unaccel;
double dy_unaccel;
};
static ClutterEventEvdev *
@ -80,6 +86,23 @@ _clutter_evdev_event_set_event_code (ClutterEvent *event,
event_evdev->evcode = evcode;
}
void
_clutter_evdev_event_set_relative_motion (ClutterEvent *event,
double dx,
double dy,
double dx_unaccel,
double dy_unaccel)
{
ClutterEventEvdev *event_evdev;
event_evdev = clutter_evdev_event_ensure_platform_data (event);
event_evdev->dx = dx;
event_evdev->dy = dy;
event_evdev->dx_unaccel = dx_unaccel;
event_evdev->dy_unaccel = dy_unaccel;
event_evdev->has_relative_motion = TRUE;
}
/**
* clutter_evdev_event_get_event_code:
* @event: a #ClutterEvent
@ -99,3 +122,39 @@ clutter_evdev_event_get_event_code (const ClutterEvent *event)
return 0;
}
/**
* clutter_evdev_event_get_pointer_motion
* @event: a #ClutterEvent
*
* If available, the normal and unaccelerated motion deltas are written
* to the dx, dy, dx_unaccel and dy_unaccel and TRUE is returned.
*
* If unavailable, FALSE is returned.
*
* Returns: TRUE on success, otherwise FALSE.
**/
gboolean
clutter_evdev_event_get_relative_motion (const ClutterEvent *event,
double *dx,
double *dy,
double *dx_unaccel,
double *dy_unaccel)
{
ClutterEventEvdev *event_evdev = _clutter_event_get_platform_data (event);
if (event_evdev && event_evdev->has_relative_motion)
{
if (dx)
*dx = event_evdev->dx;
if (dy)
*dy = event_evdev->dy;
if (dx_unaccel)
*dx_unaccel = event_evdev->dx_unaccel;
if (dy_unaccel)
*dy_unaccel = event_evdev->dy_unaccel;
return TRUE;
}
else
return FALSE;
}