Type Alias ViewPortDrawCallback 

pub type ViewPortDrawCallback = Option<unsafe extern "C" fn(canvas: *mut Canvas, context: *mut c_void)>;

ViewPort Draw callback called from GUI thread

Aliased Type

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

Variants

None

No value.

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

Some value of type T.