Struct cacao::utils::CellFactory

pub struct CellFactory(pub Rc<RefCell<HashMap<&'static str, Box<dyn Fn() -> Box<dyn Any>>>>>);

A CellFactory is an struct that stores closures that instantiate view types.

This is a pattern used in certain view types (e.g, ListView). This factory exists to enable dynamic view registration and dequeueing. It stores a closure and erases the type to Any, and supports querying for that time to get it back.

It is explicitly designed to panic if it’s unable to retrieve a stored item with the specified type, as the views that use this would cease to function if the type can’t be retrieved, and it’s better to blow up early.

Tuple Fields

0: Rc<RefCell<HashMap<&'static str, Box<dyn Fn() -> Box<dyn Any>>>>>

Implementations

impl CellFactory

pub fn new() -> Self

Creates and returns a new CellFactory.

pub fn insert<F, T>(&self, identifier: &'static str, vendor: F) where
    F: Fn() -> T + 'static,
    T: ViewDelegate + 'static, 

Store a closure for the given identifier.

pub fn get<R>(&self, identifier: &'static str) -> Box<R> where
    R: ViewDelegate + 'static, 

Attempts to retrieve the closure, downcasted to the specified type. This will panic if it’s unable to retrieve the closure with the requested type.

Trait Implementations

impl Clone for CellFactory

fn clone(&self) -> CellFactory

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CellFactory

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.