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touchpad: only send most recent edge delta when triggering threshold

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When edge scrolling is triggered by exceeding the motion threshold (5mm) we
sent the whole delta as the first scroll event, causing a big jump.

Instead, send only the current delta. This effectively introduces a 5mm dead
zone when edge scrolling, still better than the jump.

https://bugs.freedesktop.org/show_bug.cgi?id=90990

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2015-06-19 09:21:58 +10:00
parent 3195b95d1d
commit f783dae0a7
1 changed files with 4 additions and 1 deletions
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5
src/evdev-mt-touchpad-edge-scroll.c
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@ -353,7 +353,7 @@ tp_edge_scroll_post_events(struct tp_dispatch *tp, uint64_t time)
struct tp_touch *t;
enum libinput_pointer_axis axis;
double *delta;
struct normalized_coords normalized;
struct normalized_coords normalized, tmp;
const struct normalized_coords zero = { 0.0, 0.0 };
const struct discrete_coords zero_discrete = { 0.0, 0.0 };
@ -402,11 +402,14 @@ tp_edge_scroll_post_events(struct tp_dispatch *tp, uint64_t time)
t->scroll.edge_state);
break;
case EDGE_SCROLL_TOUCH_STATE_EDGE_NEW:
tmp = normalized;
normalized = tp_normalize_delta(tp,
device_delta(t->point,
t->scroll.initial));
if (fabs(*delta) < DEFAULT_SCROLL_THRESHOLD)
normalized = zero;
else
normalized = tmp;
break;
case EDGE_SCROLL_TOUCH_STATE_EDGE:
break;