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emscripten: scale mousewheel X coordinates correctly, not just Y coordinates.

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Fixes #10454.
This commit is contained in:
Ryan C. Gordon
2024-10-23 23:35:02 -04:00
parent d0cf2c19d1
commit 4ea26a7771
1 changed files with 5 additions and 1 deletions
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6
src/video/emscripten/SDL_emscriptenevents.c
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@@ -360,20 +360,24 @@ static EM_BOOL Emscripten_HandleWheel(int eventType, const EmscriptenWheelEvent
SDL_WindowData *window_data = userData;
float deltaY = wheelEvent->deltaY;
float deltaX = wheelEvent->deltaX;
switch (wheelEvent->deltaMode) {
case DOM_DELTA_PIXEL:
deltaX /= 100; // 100 pixels make up a step
deltaY /= 100; // 100 pixels make up a step
break;
case DOM_DELTA_LINE:
deltaX /= 3; // 3 lines make up a step
deltaY /= 3; // 3 lines make up a step
break;
case DOM_DELTA_PAGE:
deltaX *= 80; // A page makes up 80 steps
deltaY *= 80; // A page makes up 80 steps
break;
}
SDL_SendMouseWheel(0, window_data->window, SDL_DEFAULT_MOUSE_ID, (float)wheelEvent->deltaX, -deltaY, SDL_MOUSEWHEEL_NORMAL);
SDL_SendMouseWheel(0, window_data->window, SDL_DEFAULT_MOUSE_ID, deltaX, -deltaY, SDL_MOUSEWHEEL_NORMAL);
return SDL_EventEnabled(SDL_EVENT_MOUSE_WHEEL);
}