export class CallbackThrottle {
    private lastCallbackExecuted: number;
    private throttleTime: number;

    constructor(ms: number) {
        this.throttleTime = ms;
        this.lastCallbackExecuted = 0;
    }

    setThrottleTimer(ms: number) {
        this.throttleTime = ms;
    }

    queueCallback(func: Function) {
        if (!func) {
            throw new Error('CallbackThrottle.queueCallback(). No callback.');
        }

        this._doCallback(func);
    }

    _doCallback(func: Function) {
        let rightNow = Date.now();
        if (rightNow >= this.lastCallbackExecuted + this.throttleTime) {
            this.lastCallbackExecuted = rightNow;
            func();
        } else {
            setTimeout(() => {
                this._doCallback(func);
            }, this.lastCallbackExecuted + this.throttleTime);
        }
    }
}