Struct VirtualItem 

pub struct VirtualItem {
    pub index: usize,
    pub size: f64,
    pub start: f64,
    pub end: f64,
    pub key: VirtualKey,
    pub lane: usize,
}

Metadata for a single virtualized item.

Represents the computed layout information that the virtualizer produces for each item within the visible range. Components use this metadata to position and render items in the scroll container.

Fields

index: usize

The index of this item in the full dataset.

size: f64

The measured or estimated size of this item in pixels.

Represents height for vertical lists or width for horizontal lists.

start: f64

The offset in pixels from the start of the virtualized region.

Represents the top offset for vertical lists or the left offset for horizontal lists.

end: f64

The end position in pixels (start + size).

key: VirtualKey

A stable identity key for this item.

When a custom get_item_key is provided, this key follows the item across reorders. Otherwise it equals the index.

lane: usize

The lane index for grid layouts (0 for single-column lists).

Implementations

impl VirtualItem

pub fn new(index: usize, size: f64, start: f64) -> Self

Creates a new virtual item with the given layout parameters.

Parameters

• index: The item’s position in the full dataset.
• size: The item’s size in pixels along the scroll axis.
• start: The item’s offset from the start of the virtual region.

pub fn with_key_and_lane( index: usize, size: f64, start: f64, key: VirtualKey, lane: usize, ) -> Self

Creates a new virtual item with a specific key and lane.

Parameters

• index: The item’s position in the full dataset.
• size: The item’s size in pixels along the scroll axis.
• start: The item’s offset from the start of the virtual region.
• key: The stable identity key for this item.
• lane: The lane (column/row) index for grid layouts.

Trait Implementations

impl Clone for VirtualItem

fn clone(&self) -> VirtualItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VirtualItem

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

Formats the value using the given formatter.

impl PartialEq for VirtualItem

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for VirtualItem