Enum Value

pub enum Value<T> {
    Constant(T),
    Dynamic(Dynamic<T>),
}

A value that may be either constant or dynamic.

Variants

Constant(T)

A value that will not ever change externally.

Dynamic(Dynamic<T>)

A value that may be updated externally.

Implementations

impl<T> Value<T>

pub fn dynamic(value: T) -> Self

Returns a Value::Dynamic containing value.

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

Maps the current contents to map and returns the result.

pub fn map_tracking_redraw<R>( &self, context: &WidgetContext<'_>, map: impl FnOnce(&T) -> R, ) -> R

Maps the current contents to map and returns the result.

If self is a dynamic, context will be invalidated when the value is updated.

pub fn map_tracking_invalidate<R>( &self, context: &WidgetContext<'_>, map: impl FnOnce(&T) -> R, ) -> R

Maps the current contents to map and returns the result.

If self is a dynamic, context will be invalidated when the value is updated.

pub fn map_mut<R>(&mut self, map: impl FnOnce(Mutable<'_, T>) -> R) -> R

Maps the current contents with exclusive access and returns the result.

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

pub fn get(&self) -> T

where T: Clone,

Returns a clone of the currently stored value.

pub fn get_tracking_redraw(&self, context: &WidgetContext<'_>) -> T

where T: Clone,

Returns a clone of the currently stored value.

If self is a dynamic, context will be refreshed when the value is updated.

pub fn get_tracking_invalidate(&self, context: &WidgetContext<'_>) -> T

where T: Clone,

Returns a clone of the currently stored value.

If self is a dynamic, context will be invalidated when the value is updated.

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

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

Trait Implementations

impl<T> Clone for Value<T>

where T: Clone,

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Value<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Value<T>

where T: Default,

fn default() -> Self

Returns the “default value” for a type.

impl<T> Displayable<T> for Value<T>

where T: Debug + Display + Send + 'static,

fn into_displayable(self) -> DynamicReader<T>

Returns this value as a displayable reader.

fn into_label(self) -> Label<T>

where Self: Sized, T: Debug + Display + Send + 'static,

Returns self being Displayed in a Label widget.

impl<T> From<Dynamic<T>> for Value<T>

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

Converts to this type from the input type.

impl<T> From<Value<T>> for Tracked<Value<T>>

where T: Clone + PartialEq,

fn from(source: Value<T>) -> Self

Converts to this type from the input type.

impl<T> IntoComponentValue for Value<T>

where T: Clone + Send + 'static, Component: From<T>,

fn into_component_value(self) -> Value<Component>

Returns self stored in a component value.

impl<T> IntoDynamic<T> for Value<T>

fn into_dynamic(self) -> Dynamic<T>

Returns self as a dynamic.

impl<T> IntoReadOnly<T> for Value<T>

fn into_read_only(self) -> ReadOnly<T>

Returns self as a ReadOnly.

impl<T> IntoValue<T> for Value<T>

fn into_value(self) -> Value<T>

Returns this type as a Value.

impl IntoWidgetList for Value<WidgetList>

fn into_widget_list(self) -> Value<WidgetList>

Returns this list of widgets as a Value<WidgetList>.

fn into_rows(self) -> Stack

Returns self as a vertical Stack of rows.

fn into_columns(self) -> Stack

Returns self as a horizontal Stack of columns.

fn into_layers(self) -> Layers

Returns self as Layers, with the widgets being stacked in the Z direction.

fn into_wrap(self) -> Wrap

Returns a Wrap that lays the children out horizontally, wrapping into additional rows as needed.

fn into_list(self) -> List

Returns self as an unordered List.

impl MakeWidgetWithTag for Value<String>

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

Returns a new WidgetInstance whose WidgetId comes from tag.

impl<T> TrackedSource for Value<T>

where T: Clone + PartialEq,