Struct ItemsView 

pub struct ItemsView<'a>(/* private fields */);

The items carried by a change notification of an untyped items list: a cheap, copyable view that produces an item only when asked for it.

See the module documentation (“Change notifications”).

Implementations

impl<'a> ItemsView<'a>

pub const EMPTY: ItemsView<'static>

A view of no items.

pub const fn from_slice(items: &'a [Option<BoxedValue>]) -> Self

A view of existing untyped items.

pub fn window(list: &'a dyn IItemsList, start: usize, count: usize) -> Self

A view of count items of list starting at start. Nothing is read from the list until an item is asked for.

pub fn of_source(source: &'a ItemsSource) -> Self

A view of all the items of source. Only the count is read.

pub fn of_source_range( source: &'a ItemsSource, start: usize, count: usize, ) -> Self

A view of count items of source starting at start.

pub fn from_typed<T: PropertyValue>(items: &'a TypedItems<'a, T>) -> Self

A view of typed items, each boxed when it is read.

pub fn len(&self) -> usize

The number of items. Never reads an item.

pub fn is_empty(&self) -> bool

Whether the view has no items. Never reads an item.

pub fn get(&self, index: usize) -> Option<BoxedValue>

The item at index. Panics if out of range.

pub fn iter(&self) -> ItemsViewIter<'a>

The items, each read when the iterator reaches it.

pub fn to_vec(&self) -> Vec<Option<BoxedValue>>

A copy of the items. Reads every item.

Trait Implementations

impl<'a> Clone for ItemsView<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for ItemsView<'a>

impl Debug for ItemsView<'_>

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

Formats the value using the given formatter.

impl Default for ItemsView<'_>

fn default() -> Self

Returns the “default value” for a type.

impl<'a> From<&'a ItemsSource> for ItemsView<'a>

fn from(source: &'a ItemsSource) -> Self

Converts to this type from the input type.

impl<'a> From<&'a Vec<Option<Rc<dyn AnyValue>>>> for ItemsView<'a>

fn from(items: &'a Vec<Option<BoxedValue>>) -> Self

Converts to this type from the input type.

impl<'a, const N: usize> From<&'a [Option<Rc<dyn AnyValue>>; N]> for ItemsView<'a>

fn from(items: &'a [Option<BoxedValue>; N]) -> Self

Converts to this type from the input type.

impl<'a> From<&'a [Option<Rc<dyn AnyValue>>]> for ItemsView<'a>

fn from(items: &'a [Option<BoxedValue>]) -> Self

Converts to this type from the input type.

impl<'a> IntoIterator for ItemsView<'a>

type Item = Option<Rc<dyn AnyValue>>

The type of the elements being iterated over.

type IntoIter = ItemsViewIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> ItemsViewIter<'a>

Creates an iterator from a value.

impl<'a> IntoIterator for &ItemsView<'a>

type Item = Option<Rc<dyn AnyValue>>

The type of the elements being iterated over.

type IntoIter = ItemsViewIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> ItemsViewIter<'a>

Creates an iterator from a value.