Enum ReadOnly

pub enum ReadOnly<T> {
    Constant(T),
    Reader(DynamicReader<T>),
}

A value that can only be read from.

Variants

Constant(T)

A value that will not ever change externally.

Reader(DynamicReader<T>)

A value that is read from a dynamic.

Implementations

impl<T> ReadOnly<T>

pub fn get(&self) -> T

where T: Clone,

Returns a clone of the currently stored value.

pub fn generation(&self) -> Option<Generation>

Returns the current generation of the data stored, if the contained value is Dynamic.

pub fn map<R>(&self, map: impl FnOnce(&T) -> R) -> R

Maps the current contents to map and returns the result.

pub fn map_each<R, F>(&self, map: F) -> ReadOnly<R>

where T: Send + 'static, F: for<'a> FnMut(&'a T) -> R + Send + 'static, R: PartialEq + Send + 'static,

Returns a new value that is updated using U::from(T.clone()) each time self is updated.

Trait Implementations

impl<T> Debug for ReadOnly<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> From<Dynamic<T>> for ReadOnly<T>

fn from(value: Dynamic<T>) -> Self

Converts to this type from the input type.

impl<T> From<DynamicReader<T>> for ReadOnly<T>

fn from(value: DynamicReader<T>) -> Self

Converts to this type from the input type.

impl<T> From<Owned<T>> for ReadOnly<T>

fn from(value: Owned<T>) -> Self

Converts to this type from the input type.

impl<T> IntoReadOnly<T> for ReadOnly<T>

fn into_read_only(self) -> ReadOnly<T>

Returns self as a ReadOnly.

impl MakeWidgetWithTag for ReadOnly<String>

fn make_with_tag(self, id: WidgetTag) -> WidgetInstance

Returns a new WidgetInstance whose WidgetId comes from tag.