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keyboard: add a note about the use of transforms in getkey_opt()

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Lephe 2021-09-01 16:21:53 +02:00
parent 2d0e18f2d8
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include/gint/keyboard.h
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@ -246,6 +246,15 @@ typedef bool (*getkey_feature_t)(key_event_t event);
value whenever you want to interrupt the call; using a timer with
[timer_timeout] as callback is suitable. See <gint/timer.h>.
Event transforms in getkey_opt() (SHIFT, ALPHA and repetitions) are handled
by changing the transform settings on the keyboard device. These settings
are restored when getkey_opt() returns, so if they are originally disabled
(which they are unless set manually) then the status of the SHIFT and ALPHA
keys is lost between calls (this has an effect it getkey_opt() is
interrupted by timeout). Therefore, in order to use modifiers across several
calls to getkey_opt(), make sure to enable the transforms on the keyboard
device; see <gint/drivers/keydev.h> for details.
@options An or-combination of values from the GETKEY_* enumeration
@timeout Optional pointer to a timeout value
Returns a key event of type KEYEV_DOWN or KEYEV_HOLD with [mod=1]. */