Type Alias KeyEventCallback 

pub type KeyEventCallback = Rc<dyn Fn(&mut App, &KeyEvent) -> bool>;

The signature for HardwareKeyboard::add_handler, a callback to decide whether the entire framework handles a key event.

HardwareKeyboard::remove_handler matches the handler by allocation (Rc::ptr_eq), where Dart matches the function by identity.

Aliased Type

pub struct KeyEventCallback { /* private fields */ }