Exchange

    scrollToPercent(pos) {
        const
            { refElSizes } = this.state,
            { secondLayerOnly, firstLayerOnly, firstLayerWithScales } = this.refs,
            firstLayerOnlyWidth = firstLayerOnly.getBoundingClientRect().width,
            firstLayerWithScalesWidth = firstLayerWithScales.getBoundingClientRect().width,
            scaleDiff = firstLayerWithScalesWidth - firstLayerOnlyWidth,
            clickPercentage = (pos.x - scaleDiff) / firstLayerOnlyWidth,
            secondLayerWidth = refElSizes.layers.second.width * this.secondLayerMultiplier,
            scrollLevel = secondLayerOnly.parentNode,
            layersDiff = secondLayerWidth - refElSizes.layers.first.width,
            answer = layersDiff * clickPercentage;

        scrollLevel.scrollLeft = answer;
    }
    /*<layers*/

    /*nodes>*/
    firstLayerNodeClick(e, level, id) {
        const
            pos = {x: e.clientX, y: e.clientY};

        this.scrollToPercent(pos);
        this.changeLevel(true);
    }