import { IZoomCallbacks } from "../Interface/IZoomCallbacks";
/**
 * Represents zoom meta data.
 */
export interface ZoomData {
    minZoomScale: number;
    maxZoomScale: number;
    previousZoomScale: number;
    currentZoomScale: number;
}
export interface ZoomProperties {
    isZoomEnabled: boolean;
    zoomType: ZoomType;
}
/**
 * x and y are coordinates of cursor position on the image relative to zoomed/scaled image
 */
export interface CursorPosition {
    x: number;
    y: number;
}
/**
 * Enum indicating zoom behavior
 */
export declare enum ZoomDirection {
    In = 0,
    Out = 1
}
/**
 * This indicates the point around which an image will be zoomed in our out.
 */
export declare enum ZoomType {
    Default = 0,
    ImageCenter = 1,
    ViewportCenter = 2,
    CursorCenter = 3
}
/**
 * The manager for zoom functionality.
 */
export declare class ZoomManager {
    /**
     * [Gets] The boolean flag that indicates if zoom settings needs to be reset when new content is loaded to canvas.
     */
    get resetZoomOnContentLoad(): boolean;
    /**
     * [Sets] The boolean flag that indicates if zoom settings needs to be reset when new content is loaded to canvas.
     */
    set resetZoomOnContentLoad(reset: boolean);
    /**
     * Gets the singleton instance of Zoom Manager.
     * @param isZoomEnabled - Flag that indicates if zoom is enabled.
     * @param zoomCallbacks - [Optional] The collection of zoom callbacks.
     * @param maxZoom - [Optional] Maximum  zoom factor.
     * @param zoomScale - [Optional] Incremental/Decremental zoom factor.
     */
    static getInstance(isZoomEnabled?: boolean, editorContainerDiv?: HTMLDivElement, zoomCallbacks?: IZoomCallbacks, maxZoom?: number, zoomScale?: number): ZoomManager;
    /**
     * This holds the current instance of zoomManager.
     */
    private static instance;
    /**
     * This decides whether zoom is enabled for the project.
     */
    isZoomEnabled: boolean;
    /**
     * This indicates the point around which an image will be zoomed in our out.
     */
    zoomType: ZoomType;
    /**
     * The collection of zoom callbacks.
     */
    callbacks: IZoomCallbacks;
    isDraggingEnabled: boolean;
    /**
     * The minimum zoom factor.
     * Defaults to 1 or 100%.
     */
    private minZoomScale;
    /**
     * The maximum zoom factor.
     * Defaults to 4 or 400%.
     */
    private maxZoomScale;
    /**
     * The factor or scale at which the zoom in / zoom out works incrementally.
     */
    private zoomScale;
    /**
     * This holds the current scale at which the image is zoomed at.
     */
    private currentZoomScale;
    /**
     * This holds the previous scale at which the image is zoomed at.
     */
    private previousZoomScale;
    /**
     * boolean that states if the zoom needs to be reset on content update. Defaults to false.
     */
    private shouldResetZoomOnContentLoad;
    private zoomCanvas;
    private pos;
    private constructor();
    /**
     * Updates the zoom values based on the direction of zoom.
     * @param zoomType - The direction of zoom.
     * @returns - Zoom data object.
     */
    updateZoomScale(zoomType: ZoomDirection, newScale?: number): ZoomData;
    /**
     * Sets the maximum zoom scale.
     * @param maxZoomScale - The maximum zoom scale.
     */
    setMaxZoomScale(maxZoomScale: number): void;
    /**
     * Sets the zoom scale.
     * @param zoomScale - Zoom factor.
     */
    setZoomScale(zoomScale: number): void;
    /**
     * Gets the zoomData object.
     * @returns - Zoom data object.
     */
    getZoomData(): ZoomData;
    /**
     * Deletes the single instance of zoom manager.
     */
    deleteInstance(): void;
    /**
     * Helper function to subscribe manager to drag events
     */
    setDragging(activate: boolean): void;
    private mouseDownHandler;
    private mouseUpHandler;
    private mouseMoveHandler;
}