Struct MultibufferExcerptHeaderProvider 

pub struct MultibufferExcerptHeaderProvider { /* private fields */ }

Emits one virtual row per excerpt header, anchored above the excerpt’s first composed row. Cheap-clone reference to the multibuffer handle; re-reads excerpts on each collect().

T.7: when a [ThemeRegistryHandle] + the header element ids are supplied, collect() resolves the backdrop + path elements and bakes them into the row’s bg / cells’ fg — resolution happens off-thread at row-build time, never on a paint path. Without a handle (test paths) the rows fall back to bg: None (the renderer then picks its kind default).

Debug is hand-rolled because ThemeRegistryHandle (a dyn ThemeRegistry trait object) is not Debug; the VirtualRowProvider trait requires Debug.

Implementations

impl MultibufferExcerptHeaderProvider

pub fn new(multibuffer: MultibufferDocumentHandle) -> Self

Construct without theme wiring — headers render with no baked bg/fg (the renderer’s kind default applies). Test convenience; production uses Self::with_theme. Defaults nerd_fonts to false (BMP-fallback palette).

pub fn with_grouping(self, grouping: FoldGrouping) -> Self

OA.2: group header rows the way this view folds. Defaults to SourceFile, which is what every provider but the agenda wants.

pub fn with_theme( multibuffer: MultibufferDocumentHandle, theme: ThemeRegistryHandle, elements: MultibufferHeaderElementIds, nerd_fonts: bool, ) -> Self

T.7: construct with the resolved theme handle + the header element ids so collect() bakes the registered backdrop / path colors into the header rows. MH.A3: nerd_fonts selects the icon palette (captured at view creation; see the struct field doc for the per-buffer-toggle follow-on note).

Trait Implementations

impl Debug for MultibufferExcerptHeaderProvider

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

Formats the value using the given formatter.

impl VirtualRowProvider for MultibufferExcerptHeaderProvider

fn id(&self) -> ProviderId

A stable id for this provider. Used by the worker to deduplicate registration + route mutation notifications.

fn version(&self) -> u64

Monotonic version counter — the provider bumps it whenever the rows [Self::collect] would emit have changed. The worker uses the combined fingerprint of all providers’ versions to short-circuit on the cache-hit path without paying for the (potentially expensive) collect calls.

fn collect(&self) -> Vec<VirtualRow>

Emit the current set of virtual rows for the associated document.