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Merge branch 'win32-smooth-scrolling-gtk4' into 'master'

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GDK W32: Support smooth scrolling (GTK4)

See merge request GNOME/gtk!298
This commit is contained in:
Matthias Clasen 2018-08-18 20:39:56 +00:00
commit 62b887e064
1 changed files with 26 additions and 4 deletions
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30
gdk/win32/gdkevents-win32.c
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@ -2712,13 +2712,35 @@ gdk_event_translate (MSG *msg,
event = gdk_event_new (GDK_SCROLL);
event->any.surface = window;
event->scroll.direction = GDK_SCROLL_SMOOTH;
if (msg->message == WM_MOUSEWHEEL)
event->scroll.direction = (((short) HIWORD (msg->wParam)) > 0) ?
GDK_SCROLL_UP : GDK_SCROLL_DOWN;
{
UINT lines_multiplier = 3;
event->scroll.delta_y = (gdouble) GET_WHEEL_DELTA_WPARAM (msg->wParam) / (gdouble) WHEEL_DELTA;
/* -1 means that we should scroll in screens, not lines.
* Right now GDK doesn't support that.
*/
if (SystemParametersInfo (SPI_GETWHEELSCROLLLINES, 0, &lines_multiplier, 0) &&
lines_multiplier != (UINT) -1)
event->scroll.delta_y *= (gdouble) lines_multiplier;
}
else if (msg->message == WM_MOUSEHWHEEL)
event->scroll.direction = (((short) HIWORD (msg->wParam)) > 0) ?
GDK_SCROLL_RIGHT : GDK_SCROLL_LEFT;
{
UINT chars_multiplier = 3;
event->scroll.delta_x = (gdouble) GET_WHEEL_DELTA_WPARAM (msg->wParam) / (gdouble) WHEEL_DELTA;
/* There doesn't seem to be any indication that
* h-scroll has an equivalent of the "screen" mode,
* indicated by multiplier being (UINT) -1.
*/
if (SystemParametersInfo (SPI_GETWHEELSCROLLCHARS, 0, &chars_multiplier, 0))
event->scroll.delta_x *= (gdouble) chars_multiplier;
}
/* It seems that delta values given by Windows are
* inverted (positive delta scrolls up, not down).
*/
event->scroll.delta_x *= -1.0;
event->scroll.delta_y *= -1.0;
event->scroll.time = _gdk_win32_get_next_tick (msg->time);
event->scroll.x = (gint16) point.x / impl->surface_scale;
event->scroll.y = (gint16) point.y / impl->surface_scale;