Struct VirtualizedListState 

pub struct VirtualizedListState {
    pub selected: Option<usize>,
    /* private fields */
}

State for the VirtualizedList widget.

Fields

selected: Option<usize>

Currently selected index.

Implementations

impl VirtualizedListState

pub fn new() -> Self

Create a new state.

pub fn with_overscan(self, overscan: usize) -> Self

Create with overscan.

pub fn with_follow(self, follow: bool) -> Self

Create with follow mode enabled.

pub fn with_persistence_id(self, id: impl Into<String>) -> Self

Create with a persistence ID for state saving.

pub fn persistence_id(&self) -> Option<&str>

Get the persistence ID, if set.

pub fn scroll_offset(&self) -> usize

Get current scroll offset.

pub fn visible_count(&self) -> usize

Get visible item count (from last render).

pub fn scroll(&mut self, delta: i32, total_items: usize)

Scroll by delta (positive = down).

pub fn scroll_to(&mut self, idx: usize, total_items: usize)

Scroll to specific index.

pub fn scroll_to_top(&mut self)

Scroll to top.

pub fn scroll_to_bottom(&mut self, total_items: usize)

Scroll to bottom.

pub fn page_up(&mut self, total_items: usize)

Page up (scroll by visible count).

pub fn page_down(&mut self, total_items: usize)

Page down (scroll by visible count).

pub fn select(&mut self, index: Option<usize>)

Select an item.

pub fn select_previous(&mut self, total_items: usize)

Select previous item.

pub fn select_next(&mut self, total_items: usize)

Select next item.

pub fn is_at_bottom(&self, total_items: usize) -> bool

Check if at bottom.

pub fn set_follow(&mut self, follow: bool, total_items: usize)

Enable/disable follow mode.

pub fn follow_mode(&self) -> bool

Check if follow mode is enabled.

pub fn fling(&mut self, velocity: f32)

Start momentum scroll.

pub fn tick(&mut self, dt: Duration, total_items: usize)

Apply momentum scrolling tick.

Trait Implementations

impl Clone for VirtualizedListState

fn clone(&self) -> VirtualizedListState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VirtualizedListState

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

Formats the value using the given formatter.

impl Default for VirtualizedListState

fn default() -> Self

Returns the “default value” for a type.

impl Stateful for VirtualizedListState

type State = VirtualizedListPersistState

The state type that gets persisted.

fn state_key(&self) -> StateKey

Unique key identifying this widget instance.

fn save_state(&self) -> VirtualizedListPersistState

Extract current state for persistence.

fn restore_state(&mut self, state: VirtualizedListPersistState)

Restore state from persistence.

fn state_version() -> u32

State schema version for forward-compatible migrations.