import { BasePlugin, PluginRegistry, Listener } from '@embedpdf/core';
import { ViewportAction } from './actions';
import { ViewportPluginConfig, ViewportState, ViewportCapability, ViewportScrollMetrics, ViewportInputMetrics, ScrollToPayload } from './types';
export declare class ViewportPlugin extends BasePlugin<ViewportPluginConfig, ViewportCapability, ViewportState, ViewportAction> {
    readonly id: string;
    static readonly id: "viewport";
    private readonly viewportResize$;
    private readonly viewportMetrics$;
    private readonly scrollMetrics$;
    private readonly scrollActivity$;
    private readonly gateState$;
    private readonly scrollRequests$;
    private readonly scrollEndDelay;
    constructor(id: string, registry: PluginRegistry, config: ViewportPluginConfig);
    protected onDocumentLoadingStarted(documentId: string): void;
    protected onDocumentClosed(documentId: string): void;
    protected buildCapability(): ViewportCapability;
    private createViewportScope;
    registerViewport(documentId: string): void;
    unregisterViewport(documentId: string): void;
    setViewportResizeMetrics(documentId: string, metrics: ViewportInputMetrics): void;
    setViewportScrollMetrics(documentId: string, scrollMetrics: ViewportScrollMetrics): void;
    onScrollRequest(documentId: string, listener: Listener<ScrollToPayload>): import('@embedpdf/core').Unsubscribe;
    gate(key: string, documentId: string): void;
    releaseGate(key: string, documentId: string): void;
    private getViewportState;
    private getMetrics;
    private isScrolling;
    private isSmoothScrolling;
    private isGated;
    private hasGate;
    private getGates;
    private scrollTo;
    private bumpScrollActivity;
    onStoreUpdated(prevState: ViewportState, newState: ViewportState): void;
    initialize(_config: ViewportPluginConfig): Promise<void>;
    destroy(): Promise<void>;
}