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forbid transform change while relative mode active

This commit is contained in:
expikr 2025-02-26 09:37:30 +08:00 committed by Sam Lantinga
parent 428f0dcd61
commit 5373271a12
2 changed files with 14 additions and 4 deletions
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12
include/SDL3/SDL_mouse.h
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@ -415,13 +415,19 @@ extern SDL_DECLSPEC bool SDLCALL SDL_WarpMouseGlobal(float x, float y);
/** /**
* Set a user-defined function by which to transform relative mouse inputs. * Set a user-defined function by which to transform relative mouse inputs.
* This overrides the relative system scale and relative speed scale hints. * This overrides the relative system scale and relative speed scale hints.
* Should be called prior to enabling relative mouse mode, fails otherwise.
* *
* \param callback a callback used to transform relative mouse motion, or NULL for default behavior. * \param callback a callback used to transform relative mouse motion,
* \param userdata a pointer that is passed to `callback`. or NULL for default behavior.
* \param userdata a pointer that will be passed to `callback`.
* \returns true on success or false on failure; call SDL_GetError() for more
* information.
*
* \threadsafety This function should only be called on the main thread.
* *
* \since This function is available since SDL 3.2.6. * \since This function is available since SDL 3.2.6.
*/ */
extern SDL_DECLSPEC void SDLCALL SDL_SetRelativeMouseTransform(SDL_MouseMotionTransformCallback callback, void *userdata); extern SDL_DECLSPEC bool SDLCALL SDL_SetRelativeMouseTransform(SDL_MouseMotionTransformCallback callback, void *userdata);
/** /**
* Set relative mouse mode for a window. * Set relative mouse mode for a window.

6
src/events/SDL_mouse.c
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@ -1120,11 +1120,15 @@ void SDL_QuitMouse(void)
SDL_mice = NULL; SDL_mice = NULL;
} }
void SDL_SetRelativeMouseTransform(SDL_MouseMotionTransformCallback transform, void *userdata) bool SDL_SetRelativeMouseTransform(SDL_MouseMotionTransformCallback transform, void *userdata)
{ {
SDL_Mouse *mouse = SDL_GetMouse(); SDL_Mouse *mouse = SDL_GetMouse();
if (mouse->relative_mode) {
return SDL_SetError("Can't set mouse transform while relative mode is active");
}
mouse->InputTransform = transform; mouse->InputTransform = transform;
mouse->input_transform_data = userdata; mouse->input_transform_data = userdata;
return true;
} }
SDL_MouseButtonFlags SDL_GetMouseState(float *x, float *y) SDL_MouseButtonFlags SDL_GetMouseState(float *x, float *y)