import { LoadingProgressArgs } from "../engine_setup.js";
/** @internal */
export declare class LoadingElementOptions {
    className?: string;
    additionalClasses?: string[];
}
/** @internal */
export interface ILoadingViewHandler {
    onLoadingBegin(message?: string): any;
    onLoadingUpdate(progress: LoadingProgressArgs | number, message?: string): any;
    onLoadingFinished(message?: string): any;
    setMessage(string: string): any;
}
/** @internal */
export declare function calculateProgress01(progress: LoadingProgressArgs): number;
/** @internal */
export declare class EngineLoadingView implements ILoadingViewHandler {
    static LoadingContainerClassName: string;
    loadingProgress: number;
    /** Usually the NeedleEngineHTMLElement */
    private _element;
    private _progress;
    private _allowCustomLoadingElement;
    private _loadingElement?;
    private _loadingTextContainer;
    private _loadingBar;
    private _loadingBarFinishedColor;
    private _messageContainer;
    private _loadingElementOptions?;
    /**
     * Creates a new loading view
     * @param owner the element that will contain the loading view (should be the NeedleEngineHTMLElement)
     */
    constructor(owner: HTMLElement, opts?: LoadingElementOptions);
    onLoadingBegin(message?: string): Promise<void>;
    onLoadingUpdate(progress: LoadingProgressArgs | ProgressEvent | number, message?: string): void;
    onLoadingFinished(): void;
    setMessage(message: string): void;
    private _progressLoop;
    private smoothProgressLoop;
    private onDoneLoading;
    private updateDisplay;
    private createLoadingElement;
}