Type Alias GAUGE_KEY_EVENT_HANDLER 

pub type GAUGE_KEY_EVENT_HANDLER = Option<unsafe extern "C" fn(event: ID32, evdata: UINT32, userdata: PVOID)>;

Aliased Type

pub enum GAUGE_KEY_EVENT_HANDLER {
    None,
    Some(unsafe extern "C" fn(u32, u32, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(u32, u32, *mut c_void))

Some value of type T.