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cocoa: Don't round scroll deltas from trackpads 

Rounding the scroll deltas from trackpads causes jerky scrolling behavior
by artificially amplifying the effects of very small scroll movements.

We should only round events from devices with discrete scroll wheels,
because we know the smallest unit of movement there is a single tick.
This commit is contained in:
Cameron Gutman 2021-12-07 00:38:46 -06:00 committed by Sam Lantinga
parent 8cee50eea5
commit da0f76de6d
1 changed files with 13 additions and 9 deletions
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4
src/video/cocoa/SDL_cocoamouse.m
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@ -473,6 +473,9 @@ Cocoa_HandleMouseWheel(SDL_Window *window, NSEvent *event)
}
}
/* For discrete scroll events from conventional mice, always send a full tick.
For continuous scroll events from trackpads, send fractional deltas for smoother scrolling. */
if (![event respondsToSelector:@selector(hasPreciseScrollingDeltas)] || ![event hasPreciseScrollingDeltas]) {
if (x > 0) {
x = SDL_ceil(x);
} else if (x < 0) {
@ -483,6 +486,7 @@ Cocoa_HandleMouseWheel(SDL_Window *window, NSEvent *event)
} else if (y < 0) {
y = SDL_floor(y);
}
}
SDL_SendMouseWheel(window, mouseID, x, y, direction);
}