pub trait InterpolationControlSourceExt: IsA<InterpolationControlSource> + Sealed + 'static {
// Provided methods
fn mode(&self) -> InterpolationMode { ... }
fn set_mode(&self, mode: InterpolationMode) { ... }
fn connect_mode_notify<F: Fn(&Self) + Send + Sync + 'static>(
&self,
f: F
) -> SignalHandlerId { ... }
}