Struct VariableListState 

pub struct VariableListState { /* private fields */ }

Implementations

impl VariableListState

pub fn set_keys( &mut self, keys: Vec<String>, spec: VariableListSpec, ) -> Result<(), VirtualListError>

Install ordered keys while preserving measurements by identity.

Errors

Returns for invalid policy or duplicate keys.

pub fn measure( &mut self, key: &str, height: f64, anchor: Option<&str>, ) -> Result<f64, VirtualListError>

Record a measured item height and return the scroll correction required to keep an anchor key at the same viewport position.

Errors

Returns for unknown keys or invalid measurements.

pub fn window( &self, spec: VariableListSpec, scroll_offset: f64, viewport_height: f64, ) -> Result<VariableListWindow, VirtualListError>

Compute the bounded realization window and spacer geometry.

Errors

Returns viewport validation errors.

pub fn tail_offset(&self, viewport_height: f64) -> f64

Return the positive visible offset that keeps the bottom aligned.

pub fn measured_count(&self) -> usize

Trait Implementations

impl Clone for VariableListState

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VariableListState

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

Formats the value using the given formatter.

impl Default for VariableListState

fn default() -> Self

Returns the “default value” for a type.