import { IAnimatable } from "./IAnimatable";
/**
 * - Worldclock provides clock support for animations, advance time for each IAnimatable object added to the instance.
 * @see dragonBones.IAnimateble
 * @see dragonBones.Armature
 * @version DragonBones 3.0
 * @language en_US
 */
export declare class WorldClock implements IAnimatable {
    /**
     * - Current time. (In seconds)
     * @version DragonBones 3.0
     * @language en_US
     */
    time: number;
    /**
     * - The play speed, used to control animation speed-shift play.
     * [0: Stop play, (0~1): Slow play, 1: Normal play, (1~N): Fast play]
     * @default 1.0
     * @version DragonBones 3.0
     * @language en_US
     */
    timeScale: number;
    private _systemTime;
    private readonly _animatebles;
    private _clock;
    /**
     * - Creating a Worldclock instance. Typically, you do not need to create Worldclock instance.
     * When multiple Worldclock instances are running at different speeds, can achieving some specific animation effects, such as bullet time.
     * @version DragonBones 3.0
     * @language en_US
     */
    constructor(time?: number);
    /**
     * - Advance time for all IAnimatable instances.
     * @param passedTime - Passed time. [-1: Automatically calculates the time difference between the current frame and the previous frame, [0~N): Passed time] (In seconds)
     * @version DragonBones 3.0
     * @language en_US
     */
    advanceTime(passedTime: number): void;
    /**
     * - Check whether contains a specific instance of IAnimatable.
     * @param value - The IAnimatable instance.
     * @version DragonBones 3.0
     * @language en_US
     */
    contains(value: IAnimatable): boolean;
    /**
     * - Add IAnimatable instance.
     * @param value - The IAnimatable instance.
     * @version DragonBones 3.0
     * @language en_US
     */
    add(value: IAnimatable): void;
    /**
     * - Removes a specified IAnimatable instance.
     * @param value - The IAnimatable instance.
     * @version DragonBones 3.0
     * @language en_US
     */
    remove(value: IAnimatable): void;
    /**
     * - Clear all IAnimatable instances.
     * @version DragonBones 3.0
     * @language en_US
     */
    clear(): void;
    /**
     * @inheritDoc
     */
    get clock(): WorldClock | null;
    set clock(value: WorldClock | null);
}