Action generated when an element is given keyboard focus. This callback is called after the KILLFOCUS_CB.
int function(Ihandle *self); [in C] elem:getfocus() -> (ret: number) [in IupLua3] elem:getfocus_cb() -> (ret: number) [in IupLua5]
self: identifier of the element that received keyboard focus.
All elements with user interaction, except menus.