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wayland: fix up/down mix up in discrete events

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The wayland specification for discrete step information for scroll and
other axes reads:

| The discrete value carries the directional information. e.g. a
| value of -2 is two steps towards the negative direction of this axis.

mutter sets a value of 1 for SCROLL_DOWN events and -1 for SCROLL_UP
events.

gdkdevice Wayland backend does the opposite, it translates a positive
discrete value as SCROLL_UP and a negative value as SCROLL_DOWN, which
ends up inverting the scrolling direction.

Fix the logic in gdkdevice Wayland to use a positive value as
SCROLL_DOWN and a negative value as SCROLL_UP so that it matches mutter
and weston logic.

https://bugzilla.gnome.org/show_bug.cgi?id=765907
This commit is contained in:
Olivier Fourdan 2016-05-03 10:44:16 +02:00
parent be201a5b71
commit e74ecfe22e
1 changed files with 2 additions and 2 deletions
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4
gdk/wayland/gdkdevice-wayland.c
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@ -1138,9 +1138,9 @@ flush_scroll_event (GdkWaylandSeat *seat,
else if (pointer_frame->discrete_x < 0)
direction = GDK_SCROLL_RIGHT;
else if (pointer_frame->discrete_y > 0)
direction = GDK_SCROLL_UP;
else
direction = GDK_SCROLL_DOWN;
else
direction = GDK_SCROLL_UP;
flush_discrete_scroll_event (seat, direction);
pointer_frame->discrete_x = 0;