ReactScrollViewHelper.java 文件源码

private static void emitScrollEvent(ViewGroup scrollView, ScrollEventType scrollEventType) {
  View contentView = scrollView.getChildAt(0);

  if (contentView == null) {
    return;
  }

  ReactContext reactContext = (ReactContext) scrollView.getContext();
  reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(
      ScrollEvent.obtain(
          scrollView.getId(),
          scrollEventType,
          scrollView.getScrollX(),
          scrollView.getScrollY(),
          contentView.getWidth(),
          contentView.getHeight(),
          scrollView.getWidth(),
          scrollView.getHeight()));
}