import * as Core from "cmf.core/src/core";
/**
 * LoadingUpdateFlag
 */
export interface LoadingUpdateArgs {
    message: string;
    stepProgress: number;
    stepNumber: number;
}
/**
 * LoadingFinishFlag
 */
export interface LoadingFinishArgs {
    finish: boolean;
}
/**
 * Loading service
 */
export declare abstract class LoadingService extends Core.Generic {
    /**
     * Update callback
     */
    private _updateCallback;
    /**
     * Finish callback
     */
    private _finishCallback;
    /**
     * Is loading
     */
    private _isLoading;
    readonly isLoading: boolean;
    /**
     * Update messages queue
     */
    private _updateMessagesQueue;
    /**
     * Number of steps
     */
    private _numberOfSteps;
    numberOfSteps: number;
    /**
     * Initial message
     */
    initialMessage: string;
    private _initialMessage;
    /**
     * Constructor
     */
    constructor();
    /**
     * Start service
     */
    startService(): void;
    /**
     * End service
     */
    endService(): void;
    /**
     * Update messages queue
     */
    getUpdateMessagesQueue(): LoadingUpdateArgs[];
    /**
     * Set update callback
     * @param callback update
     */
    onUpdate(callback: any): void;
    /**
     * Set finish callback
     * @param callback finish
     */
    onFinish(callback: any): void;
    /**
     * Start loading progress
     */
    protected start(): void;
    /**
     * Update loading progress
     */
    protected update(flag: LoadingUpdateArgs): void;
    /**
     * Finish loading progress
     */
    protected finish(): void;
}