Function getTrackWidthPx

src/components/createDataZoomSlider.ts:124–128

()

  };

  const getTrackWidthPx = (): number | null => {
    // getBoundingClientRect() is robust even if the container is scaled.
    const w = track.getBoundingClientRect().width;
    return Number.isFinite(w) && w > 0 ? w : null;
  };

  const pxToPercent = (dxPx: number): number | null => {
    const w = getTrackWidthPx();