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wheel: accumulate scroll when direction changes

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Most mice with high-resolution support have a mechanism in place to
adjust the wheel to a detent. When scrolling, it is possible to stop
between two detents and this mechanism could generate a small amount of
scroll in the oposite direction.

Track the scroll direction in the wheel state machine and reset it when
the direction changes to avoid this issue.

Signed-off-by: José Expósito <jose.exposito89@gmail.com>
This commit is contained in:
José Expósito 2021-09-30 17:50:26 +02:00
parent b6a944bb80
commit d21f1ab7ab
3 changed files with 88 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
src/evdev-fallback.h
View file

@ -66,6 +66,14 @@ enum wheel_state {
WHEEL_STATE_SCROLLING,
};
enum wheel_direction {
WHEEL_DIR_UNKNOW,
WHEEL_DIR_VPOS,
WHEEL_DIR_VNEG,
WHEEL_DIR_HPOS,
WHEEL_DIR_HNEG,
};
struct mt_slot {
bool dirty;
enum mt_slot_state state;
@ -111,6 +119,7 @@ struct fallback_dispatch {
bool emulate_hi_res_wheel;
bool hi_res_event_received;
struct libinput_timer scroll_timer;
enum wheel_direction dir;
} wheel;
struct {

39
src/evdev-wheel.c
View file

@ -39,6 +39,7 @@ enum wheel_event {
WHEEL_EVENT_SCROLL_ACCUMULATED,
WHEEL_EVENT_SCROLL,
WHEEL_EVENT_SCROLL_TIMEOUT,
WHEEL_EVENT_SCROLL_DIR_CHANGED,
};
static inline const char *
@ -62,6 +63,7 @@ wheel_event_to_str(enum wheel_event event)
CASE_RETURN_STRING(WHEEL_EVENT_SCROLL_ACCUMULATED);
CASE_RETURN_STRING(WHEEL_EVENT_SCROLL);
CASE_RETURN_STRING(WHEEL_EVENT_SCROLL_TIMEOUT);
CASE_RETURN_STRING(WHEEL_EVENT_SCROLL_DIR_CHANGED);
}
return NULL;
}
@ -100,6 +102,8 @@ wheel_handle_event_on_state_none(struct fallback_dispatch *dispatch,
case WHEEL_EVENT_SCROLL:
dispatch->wheel.state = WHEEL_STATE_ACCUMULATING_SCROLL;
break;
case WHEEL_EVENT_SCROLL_DIR_CHANGED:
break;
case WHEEL_EVENT_RELEASE:
case WHEEL_EVENT_SCROLL_ACCUMULATED:
case WHEEL_EVENT_SCROLL_TIMEOUT:
@ -118,6 +122,7 @@ wheel_handle_event_on_state_pressed(struct fallback_dispatch *dispatch,
dispatch->wheel.state = WHEEL_STATE_NONE;
break;
case WHEEL_EVENT_SCROLL:
case WHEEL_EVENT_SCROLL_DIR_CHANGED:
/* Ignore scroll while the wheel is pressed */
break;
case WHEEL_EVENT_PRESS:
@ -144,6 +149,9 @@ wheel_handle_event_on_state_accumulating_scroll(struct fallback_dispatch *dispat
case WHEEL_EVENT_SCROLL:
/* Ignore scroll while accumulating deltas */
break;
case WHEEL_EVENT_SCROLL_DIR_CHANGED:
dispatch->wheel.state = WHEEL_STATE_NONE;
break;
case WHEEL_EVENT_RELEASE:
case WHEEL_EVENT_SCROLL_TIMEOUT:
log_wheel_bug(dispatch, event);
@ -168,6 +176,10 @@ wheel_handle_event_on_state_scrolling(struct fallback_dispatch *dispatch,
case WHEEL_EVENT_SCROLL_TIMEOUT:
dispatch->wheel.state = WHEEL_STATE_NONE;
break;
case WHEEL_EVENT_SCROLL_DIR_CHANGED:
wheel_cancel_scroll_timer(dispatch);
dispatch->wheel.state = WHEEL_STATE_NONE;
break;
case WHEEL_EVENT_RELEASE:
case WHEEL_EVENT_SCROLL_ACCUMULATED:
log_wheel_bug(dispatch, event);
@ -330,6 +342,30 @@ wheel_handle_state_scrolling(struct fallback_dispatch *dispatch,
wheel_flush_scroll(dispatch, device, time);
}
static void
wheel_handle_direction_change(struct fallback_dispatch *dispatch,
struct input_event *e,
uint64_t time)
{
enum wheel_direction new_dir = WHEEL_DIR_UNKNOW;
switch (e->code) {
case REL_WHEEL_HI_RES:
new_dir = (e->value > 0) ? WHEEL_DIR_VPOS : WHEEL_DIR_VNEG;
break;
case REL_HWHEEL_HI_RES:
new_dir = (e->value > 0) ? WHEEL_DIR_HPOS : WHEEL_DIR_HNEG;
break;
}
if (new_dir != WHEEL_DIR_UNKNOW && new_dir != dispatch->wheel.dir) {
dispatch->wheel.dir = new_dir;
wheel_handle_event(dispatch,
WHEEL_EVENT_SCROLL_DIR_CHANGED,
time);
}
}
void
fallback_wheel_process_relative(struct fallback_dispatch *dispatch,
struct evdev_device *device,
@ -354,12 +390,14 @@ fallback_wheel_process_relative(struct fallback_dispatch *dispatch,
dispatch->wheel.hi_res.y += e->value;
dispatch->wheel.hi_res_event_received = true;
dispatch->pending_event |= EVDEV_WHEEL;
wheel_handle_direction_change(dispatch, e, time);
wheel_handle_event(dispatch, WHEEL_EVENT_SCROLL, time);
break;
case REL_HWHEEL_HI_RES:
dispatch->wheel.hi_res.x += e->value;
dispatch->wheel.hi_res_event_received = true;
dispatch->pending_event |= EVDEV_WHEEL;
wheel_handle_direction_change(dispatch, e, time);
wheel_handle_event(dispatch, WHEEL_EVENT_SCROLL, time);
break;
}
@ -442,6 +480,7 @@ fallback_init_wheel(struct fallback_dispatch *dispatch,
char timer_name[64];
dispatch->wheel.state = WHEEL_STATE_NONE;
dispatch->wheel.dir = WHEEL_DIR_UNKNOW;
/* On kernel < 5.0 we need to emulate high-resolution
wheel scroll events */

41
test/test-pointer.c
View file

@ -796,8 +796,8 @@ START_TEST(pointer_scroll_wheel_hires)
test_hi_res_wheel_event(dev, axis, 6 * 120);
test_hi_res_wheel_event(dev, axis, 30);
test_hi_res_wheel_event(dev, axis, -40);
test_hi_res_wheel_event(dev, axis, -60);
test_hi_res_wheel_event(dev, axis, -40);
test_hi_res_wheel_event(dev, axis, 180);
}
}
@ -914,6 +914,44 @@ START_TEST(pointer_scroll_wheel_inhibit_small_deltas)
}
END_TEST
START_TEST(pointer_scroll_wheel_inhibit_dir_change)
{
struct litest_device *dev = litest_current_device();
struct libinput *li = dev->libinput;
if (!libevdev_has_event_code(dev->evdev, EV_REL, REL_WHEEL_HI_RES) &&
!libevdev_has_event_code(dev->evdev, EV_REL, REL_HWHEEL_HI_RES))
return;
litest_drain_events(dev->libinput);
/* Scroll one detent and a bit */
litest_event(dev, EV_REL, REL_WHEEL_HI_RES, 120);
litest_event(dev, EV_REL, REL_WHEEL_HI_RES, 30);
litest_event(dev, EV_SYN, SYN_REPORT, 0);
libinput_dispatch(li);
test_high_and_low_wheel_events_value(dev, REL_WHEEL_HI_RES, -150);
/* Scroll below the threshold in the oposite direction should be ignored */
litest_event(dev, EV_REL, REL_WHEEL_HI_RES, -30);
litest_event(dev, EV_SYN, SYN_REPORT, 0);
libinput_dispatch(li);
litest_assert_empty_queue(li);
/* But should be triggered if the scroll continues in the same direction */
litest_event(dev, EV_REL, REL_WHEEL_HI_RES, -120);
litest_event(dev, EV_SYN, SYN_REPORT, 0);
libinput_dispatch(li);
test_high_and_low_wheel_events_value(dev, REL_WHEEL_HI_RES, 150);
/* Scroll above the threshold in the same dir should be triggered */
litest_event(dev, EV_REL, REL_WHEEL_HI_RES, 80);
litest_event(dev, EV_SYN, SYN_REPORT, 0);
libinput_dispatch(li);
test_high_and_low_wheel_events_value(dev, REL_WHEEL_HI_RES, -80);
}
END_TEST
START_TEST(pointer_scroll_natural_defaults)
{
struct litest_device *dev = litest_current_device();
@ -3543,6 +3581,7 @@ TEST_COLLECTION(pointer)
litest_add(pointer_scroll_wheel_hires_send_only_lores_vertical, LITEST_WHEEL, LITEST_TABLET);
litest_add(pointer_scroll_wheel_hires_send_only_lores_horizontal, LITEST_WHEEL, LITEST_TABLET);
litest_add(pointer_scroll_wheel_inhibit_small_deltas, LITEST_WHEEL, LITEST_TABLET);
litest_add(pointer_scroll_wheel_inhibit_dir_change, LITEST_WHEEL, LITEST_TABLET);
litest_add(pointer_scroll_button, LITEST_RELATIVE|LITEST_BUTTON, LITEST_ANY);
litest_add(pointer_scroll_button_noscroll, LITEST_ABSOLUTE|LITEST_BUTTON, LITEST_RELATIVE);
litest_add(pointer_scroll_button_noscroll, LITEST_ANY, LITEST_RELATIVE|LITEST_BUTTON);