Returns the current cascade level of IupMainLoop. When no calls were done, return value is 0.
int IupMainLoopLevel(void); [in C] iup.MainLoopLevel() -> ret: number [in Lua]
Returns: the cascade level.
You can use this function to check if IupMainLoop was already called and avoid calling it again.
A call to IupPopup will increase one level.
IupOpen, IupClose, IupLoopStep, Guide/System Control, IDLE_ACTION, LOCKLOOP.