Trait kas::updatable::SingleData

pub trait SingleData: Debug {
    type Item: Clone;
    fn get_cloned(&self) -> Self::Item;
    fn update(&self, value: Self::Item) -> Option<UpdateHandle>;
}

Trait for viewable single data items

Associated Types

type Item: Clone

Output type

Required methods

fn get_cloned(&self) -> Self::Item

Get data (clone)

fn update(&self, value: Self::Item) -> Option<UpdateHandle>

Update data, if supported

This is optional and required only to support data updates through view widgets. If implemented, then Updatable::update_handle should return a copy of the same update handle.

Returns an UpdateHandle if an update occurred. Returns None if updates are unsupported.

This method takes only &self, thus some mechanism such as RefCell is required to obtain &mut and lower to SingleDataMut::set. The provider of this lowering should also provide an UpdateHandle.

Implementations on Foreign Types

impl<T> SingleData for Rc<T> where
    T: SingleData + ?Sized, 

type Item = <T as SingleData>::Item

pub fn get_cloned(&self) -> <Rc<T> as SingleData>::Item

pub fn update(&self, value: <Rc<T> as SingleData>::Item) -> Option<UpdateHandle>

impl<T> SingleData for Arc<T> where
    T: SingleData + ?Sized, 

type Item = <T as SingleData>::Item

pub fn get_cloned(&self) -> <Arc<T> as SingleData>::Item

pub fn update(
    &self,
    value: <Arc<T> as SingleData>::Item
) -> Option<UpdateHandle>

impl<T> SingleData for Box<T, Global> where
    T: SingleData + ?Sized, 

type Item = <T as SingleData>::Item

pub fn get_cloned(&self) -> <Box<T, Global> as SingleData>::Item

pub fn update(
    &self,
    value: <Box<T, Global> as SingleData>::Item
) -> Option<UpdateHandle>

impl<'_, T> SingleData for &'_ T where
    T: SingleData + ?Sized, 

type Item = <T as SingleData>::Item

pub fn get_cloned(&self) -> <&'_ T as SingleData>::Item

pub fn update(&self, value: <&'_ T as SingleData>::Item) -> Option<UpdateHandle>

impl<'_, T> SingleData for &'_ mut T where
    T: SingleData + ?Sized, 

type Item = <T as SingleData>::Item

pub fn get_cloned(&self) -> <&'_ mut T as SingleData>::Item

pub fn update(
    &self,
    value: <&'_ mut T as SingleData>::Item
) -> Option<UpdateHandle>

Implementors

impl<T> SingleData for SharedRc<T> where
    T: Clone + Debug, 

type Item = T