Type Alias PopupCallback 

pub type PopupCallback = Option<unsafe extern "C" fn(context: *mut c_void)>;

Popup result callback type comes from GUI thread

Aliased Type

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

Variants

None

No value.

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

Some value of type T.