import { type CandidateStyleResolver, type LabelObstacle, type NormalisedPaddingOptions, type PlacedLabel, type PointLabelDatum, type PositionedCandidateResolver, type SeriesLabelDefaults } from 'ag-charts-core';
import { BBox } from '../../scene/bbox';
/**
 * Anything taking part in a label solve. A source contributes obstacles whether or not it places
 * labels of its own, so a module owning fixed, user-authored labels can reserve their space without
 * pretending to be a series.
 *
 * `id` shares a namespace with series ids and keys the placement result, so a registered source must
 * qualify its own (e.g. `crossLines:<axisId>`).
 */
export interface LabelSource {
    readonly id: string;
    readonly usesPlacedLabels: boolean;
    /** Increments on every invalidation of the label inputs; lets placement skip unchanged ones. */
    readonly nodeDataVersion: number;
    /** `seriesRect` is the placement space's canvas origin; series already work in it and ignore it. */
    getLabelObstacles?(seriesRect: BBox): LabelObstacle[] | undefined;
}
/**
 * A source whose own labels the engine places. `ISeries` satisfies it structurally; a source reaches
 * this path only via {@link LabelSource.usesPlacedLabels}.
 */
export interface PlacedLabelSource<TLabel = unknown> extends LabelSource {
    getLabelData(seriesRect: BBox): PointLabelDatum[];
    getLabelDefaults?(): SeriesLabelDefaults | undefined;
    getLabelCandidateStyler?(): CandidateStyleResolver | undefined;
    getLabelCandidateResolver?(): PositionedCandidateResolver | undefined;
    updatePlacedLabelData?(labels: PlacedLabel<TLabel>[], seriesRect: BBox): void;
}
export declare class LabelManager {
    private labelData;
    private lastPlacementSignature?;
    private lastPlacedLabels?;
    private readonly sources;
    registerSource(source: LabelSource): void;
    /**
     * A recreated axis registers its replacement before the old one is destroyed, so a source may only
     * drop its own entry — deleting by id alone would unregister the live replacement.
     */
    unregisterSource(id: string, source?: LabelSource): void;
    updateLabels(visibleSources: PlacedLabelSource[], padding: NormalisedPaddingOptions, seriesRect?: BBox): void;
    private computePlacement;
}