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elm - scroller wheel accel - limit to avoid over/underflow 

limit wheell accel multiplier to 100,000 ... this way sane values of
wheel_event->z will not overflow. also up intermediate coors to long
longs and clamp to be sure.
This commit is contained in:
Carsten Haitzler 2020-02-15 18:37:06 +00:00
parent f02cb1cb0d
commit 0646de4f66
1 changed files with 18 additions and 7 deletions
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25
src/lib/elementary/elm_interface_scrollable.c
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@ -2052,10 +2052,11 @@ _scroll_wheel_post_event_cb(void *data, Evas *e EINA_UNUSED)
Evas_Coord x = 0, y = 0, vw = 0, vh = 0, cw = 0, ch = 0;
int pagenumber_h = 0, pagenumber_v = 0;
int mx = 0, my = 0, minx = 0, miny = 0;
int mx = 0, my = 0, minx = 0, miny = 0, panw = 0, panh = 0;
Eina_Bool hold = EINA_FALSE;
Evas_Coord pwx, pwy;
double t;
long long lx, ly;
int direction;
EINA_SAFETY_ON_NULL_RETURN_VAL(ev, EINA_TRUE);
@ -2075,6 +2076,7 @@ _scroll_wheel_post_event_cb(void *data, Evas *e EINA_UNUSED)
if (sid->scrollto.y.animator) y = sid->scrollto.y.end;
elm_obj_pan_pos_max_get(sid->pan_obj, &mx, &my);
elm_obj_pan_pos_min_get(sid->pan_obj, &minx, &miny);
elm_pan_content_size_get(sid->pan_obj, &panw, &panh);
if (x < minx) x = minx;
if (x > mx) x = mx;
if (y < miny) y = miny;
@ -2109,7 +2111,7 @@ _scroll_wheel_post_event_cb(void *data, Evas *e EINA_UNUSED)
elm_obj_pan_content_size_get(sid->pan_obj, &cw, &ch);
if (!_paging_is_enabled(sid))
{
int d = ev->z;
long long d = ev->z;
double delta_t = (double)(ev->timestamp - sid->last_wheel) / 1000.0;
double mul;
@ -2117,31 +2119,40 @@ _scroll_wheel_post_event_cb(void *data, Evas *e EINA_UNUSED)
if (delta_t > 0.2) delta_t = 0.2;
mul = 1.0 + (_elm_config->scroll_accel_factor * ((0.2 - delta_t) / 0.2));
mul = mul * (1.0 + (0.15 * sid->last_wheel_mul));
if (d > 1000) d = 1000;
else if (d < -1000) d = -1000;
if (mul > 100000.0) mul = 100000.0;
d *= mul;
sid->last_wheel = ev->timestamp;
sid->last_wheel_mul = mul;
lx = x;
ly = y;
if (!direction)
{
if ((ch > vh) || (cw <= vw))
y += d * sid->step.y;
ly += d * (long long)sid->step.y;
else
{
x += d * sid->step.x;
lx += d * (long long)sid->step.x;
direction = 1;
}
}
else
{
if ((cw > vw) || (ch <= vh))
x += d * sid->step.x;
lx += d * (long long)sid->step.x;
else
{
y += d * sid->step.y;
ly += d * (long long)sid->step.y;
direction = 0;
}
}
_scroll_wheel_post_event_go(sid, x, y);
if (ly < (0 - panh)) ly = 0 - panh;
else if (ly > (my + panh)) ly = my + panh;
if (lx < (0 - panw)) lx = 0 - panw;
else if (lx > (mx + panw)) lx = mx + panw;
_scroll_wheel_post_event_go(sid, lx, ly);
}
else
{