pub trait WindowImpl: WindowImplExt + BinImpl {
fn set_focus(&self, window: &Self::Type, focus: Option<&Widget>) { ... }
fn activate_focus(&self, window: &Self::Type) { ... }
fn activate_default(&self, window: &Self::Type) { ... }
fn keys_changed(&self, window: &Self::Type) { ... }
fn enable_debugging(&self, window: &Self::Type, toggle: bool) -> bool { ... }
}