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Bug 4716

Summary: Mac: SDL_GetModState reports incorrect Caps Lock state
Product: SDL Reporter: Tim McDaniel <timmcd101>
Component: eventsAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: icculus
Version: 2.0.10   
Hardware: All   
OS: macOS 10.14   

Description Tim McDaniel 2019-07-10 22:47:06 UTC 
I have tested this on macOS 10.14 & 10.15(beta), neither are available in the Bugzilla OS field.

SDL_GetModState appears to be reporting incorrect Caps Lock modifier state.  Below is output from the checkkeys test app.  Each of the 4 event lines represents pressing and releasing the physical Caps Lock key.

INFO: Initial state: modifiers: (none)
INFO: Key pressed :  scancode 57 = CapsLock, keycode 0x40000039 = CapsLock  modifiers: CAPS
INFO: Key released:  scancode 57 = CapsLock, keycode 0x40000039 = CapsLock  modifiers: CAPS
INFO: Key pressed :  scancode 57 = CapsLock, keycode 0x40000039 = CapsLock  modifiers: (none)
INFO: Key released:  scancode 57 = CapsLock, keycode 0x40000039 = CapsLock  modifiers: (none)

The event type (key pressed or released) matches the logical Caps Lock toggle state (i.e. matches the LED on the Caps Lock key: pressed = LED on, released = LED off).  However, the modifier state is wrong.  The sequence should be CAPS, (none), CAPS, (none).
Comment 1 Tim McDaniel 2019-07-10 22:59:16 UTC 
Also related:

With change 12907, the key events for Caps Lock no longer match the physical Caps Lock key state.  I realize this was done to avoid a permissions popup warning on macOS 10.15.  I don't have a workaround for this at the moment.  I doubt there is one.  However, it's worth noting here that this behavior does not match SDL's behavior on Windows.

bug 2157 is the related issue that led to the pre-12907 IOKit based Caps Lock tracking.
Comment 2 Ryan C. Gordon 2019-07-11 05:15:03 UTC 
(In reply to Tim McDaniel from comment #0)
> I have tested this on macOS 10.14 & 10.15(beta), neither are available in
> the Bugzilla OS field.

This is fixed in Bugzilla now, sorry!

> SDL_GetModState appears to be reporting incorrect Caps Lock modifier state. 
> Below is output from the checkkeys test app.  Each of the 4 event lines
> represents pressing and releasing the physical Caps Lock key.

This is now fixed in https://hg.libsdl.org/SDL/rev/41528cbd80ab ... it should report the CapsLock modifier correctly now, thanks!

I don't have a better workaround for keypress events at the moment, but I'll think on it more, even if we have to give up eventually. Let's track that over on Bug #2157 and close this one, though.

--ryan.