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touchpad: add two-finger average scrolling

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If two fingers are down and moving, take the average movement of both fingers
and use that for scrolling.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2014-02-06 19:17:22 +10:00
parent 8d867a2b8a
commit d22cdf1c47
1 changed files with 43 additions and 1 deletions
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44
src/evdev-mt-touchpad.c
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@ -331,14 +331,56 @@ tp_post_process_state(struct tp_dispatch *tp, uint32_t time)
}
}
static void
tp_post_twofinger_scroll(struct tp_dispatch *tp, uint32_t time)
{
struct tp_touch *t;
int nchanged = 0;
double dx = 0, dy =0;
double tmpx, tmpy;
tp_for_each_touch(tp, t) {
if (t->dirty) {
nchanged++;
tp_get_delta(t, &tmpx, &tmpy);
dx += tmpx;
dy += tmpy;
}
}
if (nchanged == 0)
return;
dx /= nchanged;
dy /= nchanged;
tp_filter_motion(tp, &dx, &dy, time);
if (dx != 0.0)
pointer_notify_axis(&tp->device->base,
time,
LIBINPUT_POINTER_AXIS_HORIZONTAL_SCROLL,
li_fixed_from_double(dx));
if (dy != 0.0)
pointer_notify_axis(&tp->device->base,
time,
LIBINPUT_POINTER_AXIS_VERTICAL_SCROLL,
li_fixed_from_double(dy));
}
static void
tp_post_events(struct tp_dispatch *tp, uint32_t time)
{
struct tp_touch *t = tp_current_touch(tp);
double dx, dy;
if (tp->nfingers_down != 1)
if (tp->nfingers_down > 2) {
return;
} else if (tp->nfingers_down == 2) {
tp_post_twofinger_scroll(tp, time);
return;
}
if (t->history.count < 4)