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Add: Implement 2D map scrolling under SDL2 (#13167) 

Use a base multiplier to keep the existing option range (1-15).

SDL2 >= 2.18 allows for considerably smoother scrolling, but
basic support for earlier versions is included.
pull/13172/head
Eri the Switch 2024-12-13 12:21:30 +03:00 committed by Peter Nelson
parent 32dfb37b9d
commit 69ee8a8480
1 changed files with 13 additions and 1 deletions
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14
src/video/sdl2_v.cpp
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@ -404,13 +404,25 @@ bool VideoDriver_SDL_Base::PollEvent()
break;
}
case SDL_MOUSEWHEEL:
case SDL_MOUSEWHEEL: {
if (ev.wheel.y > 0) {
_cursor.wheel--;
} else if (ev.wheel.y < 0) {
_cursor.wheel++;
}
/* Handle 2D scrolling. */
const float SCROLL_BUILTIN_MULTIPLIER = 14.0f;
#if SDL_VERSION_ATLEAST(2, 18, 0)
_cursor.v_wheel -= ev.wheel.preciseY * SCROLL_BUILTIN_MULTIPLIER * _settings_client.gui.scrollwheel_multiplier;
_cursor.h_wheel += ev.wheel.preciseX * SCROLL_BUILTIN_MULTIPLIER * _settings_client.gui.scrollwheel_multiplier;
#else
_cursor.v_wheel -= static_cast<float>(ev.wheel.y * SCROLL_BUILTIN_MULTIPLIER * _settings_client.gui.scrollwheel_multiplier);
_cursor.h_wheel += static_cast<float>(ev.wheel.x * SCROLL_BUILTIN_MULTIPLIER * _settings_client.gui.scrollwheel_multiplier);
#endif
_cursor.wheel_moved = true;
break;
}
case SDL_MOUSEBUTTONDOWN:
if (_rightclick_emulate && SDL_GetModState() & KMOD_CTRL) {