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Reverse horizontal scrolling behavior

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The SDL mouse wheel event seems inconsistent between horizontal and
vertical scrolling.

> Movements to the left generate negative x values and to the right
> generate positive x values. Movements down (scroll backward) generate
> negative y values and up (scroll forward) generate positive y values.

<https://wiki.libsdl.org/SDL_MouseWheelEvent#Remarks>

Reverse the horizontal.

Fixes <https://github.com/Genymobile/scrcpy/issues/49>.
This commit is contained in:
Romain Vimont 2018-03-12 09:37:46 +01:00
parent f6d0893316
commit f9a63ec272
1 changed files with 4 additions and 1 deletions
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5
app/src/convert.c
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@ -172,7 +172,10 @@ SDL_bool mouse_wheel_from_sdl_to_android(const SDL_MouseWheelEvent *from,
to->scroll_event.position = position;
int mul = from->direction == SDL_MOUSEWHEEL_NORMAL ? 1 : -1;
to->scroll_event.hscroll = mul * from->x;
// SDL behavior seems inconsistent between horizontal and vertical scrolling
// so reverse the horizontal
// <https://wiki.libsdl.org/SDL_MouseWheelEvent#Remarks>
to->scroll_event.hscroll = -mul * from->x;
to->scroll_event.vscroll = mul * from->y;
return SDL_TRUE;