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This is implemented via a low-level keyboard hook. Unfortunately, this is rather invasive, but it's how Microsoft recommends that it be done [0]. We want to do as little as possible in the hook, so we only intercept a few crucial modifier keys there, while leaving other keys to the normal event processing flow. We will only install this hook if SDL_HINT_GRAB_KEYBOARD=1, which is not the default. This will reduce any compatibility concerns to just the SDL applications that explicitly ask for this behavior. We also remove the hook when the grab is terminated to ensure that we're not unnecessarily staying involved in key event processing when it's not required anymore. [0]: https://docs.microsoft.com/en-us/windows/win32/dxtecharts/disabling-shortcut-keys-in-games
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)