message: set containerWidth onStart
diff: @@ -57,6 +57,9 @@ class Slider extends Component<SliderProps, SliderState> {
  onStart: TouchEventHandler = (e: TouchEvent) => {
  const boundingRect = this.container.getBoundingClientRect();
  + this.setState({
  + containerWidth: boundingRect.width,
  + }, () => {
  const absolutePosition = this.validateAbsolute(e.startX - boundingRect.left);
  const percentPosition = this.absoluteToPecent(absolutePosition);
  @@ -70,6 +73,7 @@ class Slider extends Component<SliderProps, SliderState> {
  percentPosition,
  });
  }
  + });
  };
  onMoveX: TouchEventHandler = (e: TouchEvent) => {
  