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Fixed mouse wheel scrolling direction on iOS

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This commit is contained in:
Sam Lantinga
2023-11-14 09:10:56 -08:00
parent f5600fd9f4
commit 15504da0b8
1 changed files with 39 additions and 1 deletions
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40
src/video/uikit/SDL_uikitevents.m
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@@ -273,6 +273,31 @@ static int mice_connected = 0;
static id mouse_connect_observer = nil;
static id mouse_disconnect_observer = nil;
static bool mouse_relative_mode = SDL_FALSE;
static SDL_MouseWheelDirection mouse_scroll_direction = SDL_MOUSEWHEEL_NORMAL;
static void UpdateScrollDirection(void)
{
#if 0 /* This code doesn't work for some reason */
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
if ([userDefaults boolForKey:@"com.apple.swipescrolldirection"]) {
mouse_scroll_direction = SDL_MOUSEWHEEL_FLIPPED;
} else {
mouse_scroll_direction = SDL_MOUSEWHEEL_NORMAL;
}
#else
Boolean keyExistsAndHasValidFormat = NO;
Boolean naturalScrollDirection = CFPreferencesGetAppBooleanValue(CFSTR("com.apple.swipescrolldirection"), kCFPreferencesAnyApplication, &keyExistsAndHasValidFormat);
if (!keyExistsAndHasValidFormat) {
/* Couldn't read the preference, assume natural scrolling direction */
naturalScrollDirection = YES;
}
if (naturalScrollDirection) {
mouse_scroll_direction = SDL_MOUSEWHEEL_FLIPPED;
} else {
mouse_scroll_direction = SDL_MOUSEWHEEL_NORMAL;
}
#endif
}
static void UpdatePointerLock(void)
{
@@ -325,8 +350,21 @@ static void OnGCMouseConnected(GCMouse *mouse) API_AVAILABLE(macos(11.0), ios(14
};
mouse.mouseInput.scroll.valueChangedHandler = ^(GCControllerDirectionPad *dpad, float xValue, float yValue) {
SDL_SendMouseWheel(0, SDL_GetMouseFocus(), 0, xValue, yValue, SDL_MOUSEWHEEL_NORMAL);
/* Raw scroll values come in here, vertical values in the first axis, horizontal values in the second axis.
* The vertical values are negative moving the mouse wheel up and positive moving it down.
* The horizontal values are negative moving the mouse wheel left and positive moving it right.
* The vertical values are inverted compared to SDL, and the horizontal values are as expected.
*/
float vertical = -xValue;
float horizontal = yValue;
if (mouse_scroll_direction == SDL_MOUSEWHEEL_FLIPPED) {
/* Since these are raw values, we need to flip them ourselves */
vertical = -vertical;
horizontal = -horizontal;
}
SDL_SendMouseWheel(0, SDL_GetMouseFocus(), mouseID, horizontal, vertical, mouse_scroll_direction);
};
UpdateScrollDirection();
dispatch_queue_t queue = dispatch_queue_create("org.libsdl.input.mouse", DISPATCH_QUEUE_SERIAL);
dispatch_set_target_queue(queue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));