private renderScrollbar()

in src/TornadoChartScrolling.ts [150:197]
40 lines of code
2 McCabe index (conditional complexity)

    private renderScrollbar(
        brush: d3.BrushBehavior<any>,
        brushGraphicsContext: Selection<any>,
        brushX: number,
        scrollbarHight: number,
        onRender: (d3Selection: any, value: number) => void
    ): void {

        let d3Event = () => require("d3-selection").event;
        brush.on("brush", () => {
            let d3Selection: Selection<any> = d3Event().selection;
            window.requestAnimationFrame(() => onRender(d3Selection, 0));
        });
        this.root.on("wheel", () => {
            let d3Selection: Selection<any> = d3Event().selection;

            if (!this.isYScrollBarVisible) return;
            let wheelEvent: any = d3.event; // Casting to any to avoid compilation errors
            onRender(d3Selection, wheelEvent.deltaY);
        });

        brushGraphicsContext
            .attr("transform", translate(brushX, 0))
            .attr("drag-resize-disabled", "true");

        brushGraphicsContext
            .call(brush)
            .call(brush.move, [0, scrollbarHight]);

        // Disabling the zooming feature
        brushGraphicsContext
            .selectAll(".handle")
            .remove();

        brushGraphicsContext
            .select(".background")
            .remove();

        brushGraphicsContext
            .select(".overlay")
            .remove();

        brushGraphicsContext
            .selectAll(".selection")
            .style("fill-opacity", TornadoChartScrolling.ExtentFillOpacity)
            .style("cursor", "default")
            .style("display", null);
    }