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Hash : cc7b2fc5
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Date : 2018-03-10T21:13:50
Temporary fix for bug 3432 - macOS 10.12: small scrolls (1 wheel notch) don't generate events Eric Wasylishen This bug was reintroduced by https://hg.libsdl.org/SDL/rev/fcf24b38a28a The steps to reproduce are the same: run the "testrelative" SDL demo with "--info all", connect a USB mouse with a scroll wheel, and roll the scroll wheel one "notch". You'll get log output like: testdraw2[1644:67222] INFO: SDL EVENT: Mouse: wheel scrolled 0 in x and 0 in y (reversed: 1) in window 1 As far as I can tell macOS doesn't have an API for getting the number of "wheel notches"; I get a deltaY of 0.100006 for one "notch", and it's heavily accelerated (if you roll the wheel quickly you'll get large deltas). So NSEvent's deltaY is only meant to be used for scrolling a scroll view, with the given distance in points, not something like selecting an item in a game. Here's a temporary patch that at restores the foor/ceil in Cocoa_HandleMouseWheel. Not ideal, but at least it restores the ability to scroll one notch of a mousewheel.
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README.txt
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Simple DirectMedia Layer (SDL) Version 2.0 --- https://www.libsdl.org/ Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games. More extensive documentation is available in the docs directory, starting with README.md Enjoy! Sam Lantinga (slouken@libsdl.org)