Struct VirtualSource 

pub struct VirtualSource { /* private fields */ }

A lazily materialized, keyed source for a virtualizing control.

Item functions are called only for indices that the control needs to realize.

Implementations

impl VirtualSource

pub fn new<K, V, KI, VI>(key_revision: u64, len: usize, key: K, view: V) -> Self

where K: Fn(usize) -> KI + 'static, V: Fn(usize) -> VI + 'static, KI: Into<Key>, VI: Into<View>,

Creates an indexed source whose item views are built only when needed.

key_revision must change whenever the length, order, or value of any key changes. It may remain unchanged when only item view data changes. The key and view functions are called only with indices less than len.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn key_revision(&self) -> u64

Trait Implementations

impl Clone for VirtualSource

fn clone(&self) -> VirtualSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VirtualSource

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

Formats the value using the given formatter.

impl PartialEq for VirtualSource

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.