import { ObservedValueOf } from 'rxjs';
import { Reader } from '../../reader';
import { ReactiveEntity } from '../../utils/ReactiveEntity';
import { ZoomPosition } from './types';
import { ScrollNavigationController } from '../..';
export type ZoomControllerState = {
    isZooming: boolean;
    currentScale: number;
    currentPosition: ZoomPosition;
};
export declare class ZoomController extends ReactiveEntity<ZoomControllerState> {
    protected reader: Reader;
    private enterSubject;
    private exitSubject;
    constructor(reader: Reader);
    enter(options?: ObservedValueOf<typeof this.enterSubject>): void;
    exit(options?: ObservedValueOf<typeof this.exitSubject>): void;
    move(position: {
        x: number;
        y: number;
    }, options?: {
        constrain?: "within-viewport";
    }): void;
    scaleAt(userScale: number, options?: {
        constrain?: "within-viewport";
    }): void;
    protected updateZoom(scale: number, position?: ZoomPosition, options?: {
        constraints?: (position: ZoomPosition, scale: number) => ZoomPosition;
    }): void;
    protected applyZoom(scale: number, position: {
        x: number;
        y: number;
    }): void;
    protected get isControlled(): boolean;
    protected get scrollNavigationController(): ScrollNavigationController;
    protected get viewport(): {
        element: HTMLElement;
        pageSize: {
            width: number;
            height: number;
        };
        width: number;
        height: number;
    };
}