interface RulerStyleConfig {
    bgColor?: string;
    textColor?: string;
    lineColor?: string;
}
interface IRulerConfig {
    container: string | HTMLElement;
    canvas: string | HTMLCanvasElement;
    indicator: string | HTMLElement;
    fps?: number;
    scale?: number;
    duration?: number;
    currentTime?: number;
    containerScale?: number;
    style?: RulerStyleConfig;
    onInit?: () => void;
    onScale?: (scale: number) => void;
    onSeek?: (time: number) => void;
    onUITimeChange?: (time: number) => void;
}
type ScaleLevel = {
    step: number;
    group: number;
    criticalW: number;
};
declare class Ruler {
    readonly config: IRulerConfig;
    static instance: Ruler;
    dpr: number;
    fps: number;
    scaleLevel: ScaleLevel[];
    private container;
    private canvas;
    private indicator;
    private ctx;
    minScale: number;
    maxScale: number;
    private scale;
    private containerScale;
    private currentFrame;
    private totalFrames;
    private timePerFrame;
    private viewportStart;
    private viewportWidth;
    private scaleLevelIdx;
    private basePixelPerFrame;
    private isMouseDown;
    private renderRequestId;
    constructor(config: IRulerConfig);
    static getInstance(config: IRulerConfig): Ruler;
    private initEvents;
    private initCanvas;
    private handleResize;
    private updateScaleLevel;
    private updateBasePixelPerFrame;
    private initScaleLevel;
    preFrame(): void;
    nextFrame(): void;
    fit(): void;
    frameToPixel(frame: number): number;
    pixelToFrame(pixel: number): number;
    timeToPixel(time: number): number;
    pixelToTime(pixel: number): number;
    private getValidateScale;
    setScale(scale: number): void;
    setCurrentTime(time: number): void;
    setDuration(duration: number): void;
    private scheduleRender;
    private render;
    private formatTime;
    /**
     * 处理指针移动
     */
    private handleIndicatorMove;
    /**
     * 根据鼠标位置计算currentTime
     */
    private handleCurTimeOfMousePos;
    /**
     * 处理容器点击
     */
    private handleContainerClick;
    private handleOnSeek;
    /**
     * 处理滚动
     */
    private handleScroll;
    /**
     * 处理缩放
     */
    private handleWheel;
    getBasePixelPerMs(): number;
    /**
     * 更新容器的缩放比例
     */
    updateContainerScale(scale: number): void;
}

export { Ruler };
export type { IRulerConfig, RulerStyleConfig };