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gdk/x11: Transform XI_Motion based scroll into discrete

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Depending on the input driver, we will get XI_Motion based scroll
events for regular mouse wheels. These are intended to be handled
as discrete scroll, so detect smooth scroll events that move by
exactly 1.0 in either direction.

Fixes: https://gitlab.gnome.org/GNOME/gtk/-/issues/3459
This commit is contained in:
Carlos Garnacho 2020-12-16 14:07:13 +01:00
parent 2192bb3dde
commit c95a32def8
1 changed files with 38 additions and 8 deletions
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46
gdk/x11/gdkdevicemanager-xi2.c
View File

@ -1716,19 +1716,49 @@ gdk_x11_device_manager_xi2_translate_event (GdkEventTranslator *translator,
scroll_valuators_changed (GDK_X11_DEVICE_XI2 (source_device),
&xev->valuators, &delta_x, &delta_y))
{
GdkModifierType state;
GDK_DISPLAY_NOTE (display, EVENTS,
g_message ("smooth scroll: \n\tdevice: %u\n\tsource device: %u\n\twindow %ld\n\tdeltas: %f %f",
xev->deviceid, xev->sourceid,
xev->event, delta_x, delta_y));
event = gdk_scroll_event_new (surface,
device,
NULL,
xev->time,
_gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group),
delta_x,
delta_y,
delta_x == 0.0 && delta_y == 0.0);
state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);
if (gdk_device_get_source (source_device) != GDK_SOURCE_TOUCHPAD &&
((delta_x == 0.0 && ABS (delta_y) == 1.0) ||
(ABS (delta_x) == 1.0 && delta_y == 0.0)))
{
GdkScrollDirection direction;
if (delta_x > 0)
direction = GDK_SCROLL_RIGHT;
else if (delta_x < 0)
direction = GDK_SCROLL_LEFT;
else if (delta_y > 0)
direction = GDK_SCROLL_DOWN;
else
direction = GDK_SCROLL_UP;
event = gdk_scroll_event_new_discrete (surface,
device,
NULL,
xev->time,
state,
direction,
FALSE);
}
else
{
event = gdk_scroll_event_new (surface,
device,
NULL,
xev->time,
state,
delta_x,
delta_y,
delta_x == 0.0 && delta_y == 0.0);
}
break;
}