Function get_virtual_items

primitives/src/virtual/virtualizer.rs:204–221

Return the virtual items to render. This is meant to be called in the render body.** It `.read()`s `scroll_offset` and `viewport_size` to subscribe the component.

(
    state: &Store<VirtualizerState>,
    measurements: &[VirtualItem],
    overscan: usize,
)

/// **This is meant to be called in the render body.**  It `.read()`s
/// `scroll_offset` and `viewport_size` to subscribe the component.
pub fn get_virtual_items(
    state: &Store<VirtualizerState>,
    measurements: &[VirtualItem],
    overscan: usize,
) -> Vec<VirtualItem> {
    let range = match calculate_range(state, measurements) {
        Some(r) => r,
        None => return Vec::new(),
    };

    let count = measurements.len();
    let indexes = default_range_extractor(range, overscan, count);

    indexes
        .into_iter()
        .filter_map(|i| measurements.get(i).cloned())
        .collect()
}

/// Return the total scrollable size.
///