Struct ScrollManager 

pub struct ScrollManager<V: View + Clone + Send + Sync + 'static> { /* private fields */ }

Virtual scroll manager with Ankurah LiveQuery integration

Implementations

impl<V: View + Clone + Send + Sync + 'static> ScrollManager<V>

pub fn new( ctx: &Context, predicate: impl TryInto<Predicate, Error = impl Debug>, display_order: impl IntoOrderBy, minimum_row_height: u32, buffer_factor: f64, viewport_height: u32, ) -> Result<Self, RetrievalError>

Create a new scroll manager

Arguments

• ctx - Ankurah context
• predicate - Filter predicate (e.g., "room_id = 'abc'")
• display_order - Visual order (e.g., "timestamp DESC" for chat)
• minimum_row_height - Guaranteed minimum item height in pixels
• buffer_factor - Buffer as multiple of viewport (2.0 = 2x viewport buffer)
• viewport_height - Viewport height in pixels

pub async fn start(&self)

Initialize the scroll manager (waits for initial query results) generally this should be backgrounded and not awaited on.

pub fn visible_set(&self) -> Read<VisibleSet<V>>

pub fn mode(&self) -> ScrollMode

pub fn current_selection(&self) -> String

Get the current selection (predicate + order by) as a string.

pub fn debug_info(&self) -> Read<ScrollDebugInfo>

Get debug info about scroll position and buffer state

pub fn on_scroll( &self, first_visible: EntityId, last_visible: EntityId, scrolling_backward: bool, )

Notify the scroll manager of visible item changes

Arguments

• first_visible - EntityId of the first (oldest) visible item
• last_visible - EntityId of the last (newest) visible item
• scrolling_backward - True if user is scrolling toward older items