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Created attachment 621 [details]
Patch that adds hint to disable the idle timeout on iOS

iOS will timeout after about 45 seconds with no input and dim the screen, then subsequently lock the phone. This is fine for applications that always have touch input, but games often use the accelerometer alone. Accelerometer inputs are not counted towards preventing the idle timeout, so if this is the primary means of control, the idle timer must be disabled.

This patch adds a hint SDL_IOS_IDLE_TIMER_DISABLED in order to do this. I found I needed to add a callback facility to the hint system in order to notify any interested parties when a particular hint value changed. This was necessary as there isn't really a convenient place to periodically check the hint value on the iOS port of SDL and only checking the hint once on start up means you can't toggle the setting later on. It's probably quite a useful addition for future hints though, so I don't feel too bad about it.