Struct CallbackHolder 

pub struct CallbackHolder { /* private fields */ }

CallbackHolder keeps the latest callback closure alive across recompositions. It stores the callback in an Rc<RefCell<…>> so that the composer can hand out lightweight forwarder closures without cloning the underlying callback value.

Implementations

impl CallbackHolder

pub fn new() -> Self

Create a new holder with a no-op callback so that callers can immediately invoke it.

pub fn update<F>(&self, f: F)

where F: FnMut() + 'static,

Replace the stored callback with a new closure provided by the caller.

pub fn clone_rc(&self) -> impl FnMut() + 'static

Produce a forwarder closure that keeps the holder alive and forwards calls to it.

Trait Implementations

impl Clone for CallbackHolder

fn clone(&self) -> CallbackHolder

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for CallbackHolder

fn default() -> Self

Returns the “default value” for a type.