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Cancel any accumulated mouse wheel motion in the opposite direction when the wheel direction changes 

Fixes https://github.com/libsdl-org/SDL/issues/2912
This commit is contained in:
Sam Lantinga 2021-11-08 09:58:11 -08:00
parent 5dbbc8e61f
commit a3e8fd49e6
1 changed files with 22 additions and 4 deletions
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26
src/events/SDL_mouse.c
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@ -623,20 +623,38 @@ SDL_SendMouseWheel(SDL_Window * window, SDL_MouseID mouseID, float x, float y, S
return 0;
}
if (x > 0.0f) {
if (mouse->accumulated_wheel_x < 0.0f) {
mouse->accumulated_wheel_x = 0.0f;
}
} else if (x < 0.0f) {
if (mouse->accumulated_wheel_x > 0.0f) {
mouse->accumulated_wheel_x = 0.0f;
}
}
mouse->accumulated_wheel_x += x;
if (mouse->accumulated_wheel_x > 0) {
if (mouse->accumulated_wheel_x > 0.0f) {
integral_x = (int)SDL_floor(mouse->accumulated_wheel_x);
} else if (mouse->accumulated_wheel_x < 0) {
} else if (mouse->accumulated_wheel_x < 0.0f) {
integral_x = (int)SDL_ceil(mouse->accumulated_wheel_x);
} else {
integral_x = 0;
}
mouse->accumulated_wheel_x -= integral_x;
if (y > 0.0f) {
if (mouse->accumulated_wheel_y < 0.0f) {
mouse->accumulated_wheel_y = 0.0f;
}
} else if (y < 0.0f) {
if (mouse->accumulated_wheel_y > 0.0f) {
mouse->accumulated_wheel_y = 0.0f;
}
}
mouse->accumulated_wheel_y += y;
if (mouse->accumulated_wheel_y > 0) {
if (mouse->accumulated_wheel_y > 0.0f) {
integral_y = (int)SDL_floor(mouse->accumulated_wheel_y);
} else if (mouse->accumulated_wheel_y < 0) {
} else if (mouse->accumulated_wheel_y < 0.0f) {
integral_y = (int)SDL_ceil(mouse->accumulated_wheel_y);
} else {
integral_y = 0;