Ksp reference Manual

17.4. Callbacks and UI
Callback Type Variables and Constants
Built-in Variables and Constants
162
KSP Reference Manual

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$NI_CALLBACK_ID
Returns the ID number of the callback. Every callback has a unique ID number which remains the same within a function.
$NI_CALLBACK_TYPE
Returns the callback type. Useful for retrieving the callback that triggered a specific function.
The following constants are available:
$NI_CB_TYPE_ASYNC_OUT
$NI_CB_TYPE_CONTROLLER
$NI_CB_TYPE_INIT
$NI_CB_TYPE_LISTENER
$NI_CB_TYPE_NOTE
$NI_CB_TYPE_PERSISTENCE_CHANGED
$NI_CB_TYPE_PGS
$NI_CB_TYPE_POLY_AT
$NI_CB_TYPE_RELEASE
$NI_CB_TYPE_RPN/$NI_CB_TYPE_NRPN
$NI_CB_TYPE_UI_CONTROL
$NI_CB_TYPE_UI_UPDATE
$NI_CB_TYPE_MIDI_IN
Listener Constants
Can be used with 
set_listener()
or 
change_listener_par()
to set which signals will trigger the 
on listener
call-
back. Can also be used with 
$NI_SIGNAL_TYPE
to determine which signal type triggered the callback.
$NI_SIGNAL_TRANSP_STOP
$NI_SIGNAL_TRANSP_START
$NI_SIGNAL_TIMER_MS
$NI_SIGNAL_TIMER_BEAT