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wayland: Improve checks when flushing scroll events

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If we get gdk_wayland_seat_flush_frame_event() with no previous event to be
flushed, we fallback into the scroll event checks. However, there's no check
performed there as to whether it really scrolled, so it'd always send a smooth
scroll event with 0/0 deltas in this case.

This should be mostly harmless, but still, we should only end up emitting scroll
events if those really happened.
This commit is contained in:
Carlos Garnacho 2016-04-18 14:10:49 +01:00
parent bfcd9a2193
commit f7108d4d43
1 changed files with 21 additions and 16 deletions
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37
gdk/wayland/gdkdevice-wayland.c
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@ -1142,26 +1142,31 @@ flush_scroll_event (GdkWaylandSeat *seat,
direction = GDK_SCROLL_DOWN; direction = GDK_SCROLL_DOWN;
flush_discrete_scroll_event (seat, direction); flush_discrete_scroll_event (seat, direction);
pointer_frame->discrete_x = 0;
pointer_frame->discrete_y = 0;
} }
/* Axes can stop independently, if we stop on one axis but have a if (pointer_frame->is_scroll_stop ||
* delta on the other, we don't count it as a stop event. pointer_frame->delta_x != 0 ||
*/ pointer_frame->delta_y != 0)
if (pointer_frame->is_scroll_stop && {
pointer_frame->delta_x == 0 && /* Axes can stop independently, if we stop on one axis but have a
pointer_frame->delta_y == 0) * delta on the other, we don't count it as a stop event.
is_stop = TRUE; */
if (pointer_frame->is_scroll_stop &&
pointer_frame->delta_x == 0 &&
pointer_frame->delta_y == 0)
is_stop = TRUE;
flush_smooth_scroll_event (seat, flush_smooth_scroll_event (seat,
pointer_frame->delta_x, pointer_frame->delta_x,
pointer_frame->delta_y, pointer_frame->delta_y,
is_stop); is_stop);
pointer_frame->delta_x = 0; pointer_frame->delta_x = 0;
pointer_frame->delta_y = 0; pointer_frame->delta_y = 0;
pointer_frame->discrete_x = 0; pointer_frame->is_scroll_stop = FALSE;
pointer_frame->discrete_y = 0; }
pointer_frame->is_scroll_stop = FALSE;
} }
static void static void