import { FrameCounter } from './FrameCounter';
/**
 * (To be filled)
 */
export declare abstract class TimedFrameCounter extends FrameCounter {
    /**
     * Function that will be called when the cycle has been completed.
     */
    completeBehavior: () => any;
    /**
     * True if this counter is activated.
     */
    readonly isOn: boolean;
    protected durationFrameCount: number;
    protected _isOn: boolean;
    /**
     *
     * @param durationFrameCount
     * @param completeBehavior
     */
    constructor(durationFrameCount: number, completeBehavior?: () => any);
    /**
     * Activate this counter.
     * @param duration
     * @chainable
     */
    on(duration?: number): TimedFrameCounter;
    /**
     * Deactivate this counter.
     * @chainable
     */
    off(): TimedFrameCounter;
    /**
     * @override
     */
    step(): void;
    /**
     * Returns the progress ratio within the cycle.
     */
    abstract getProgressRatio(): number;
    protected abstract completeCycle(): void;
}