contentBuilder method

@override Widget contentBuilder(BuildContext context, RefreshMode refreshState, double pulledExtent, double refreshTriggerPullDistance, double refreshIndicatorExtent, AxisDirection axisDirection, bool float, Duration? completeDuration, bool enableInfiniteRefresh, bool success, bool noMore,)

Implementation

@override
Widget contentBuilder(
    BuildContext context,
    RefreshMode refreshState,
    double pulledExtent,
    double refreshTriggerPullDistance,
    double refreshIndicatorExtent,
    AxisDirection axisDirection,
    bool float,
    Duration? completeDuration,
    bool enableInfiniteRefresh,
    bool success,
    bool noMore) {
  // print(
  //     '$refreshState  拉动距离:$pulledExtent 触发刷新距离:$refreshTriggerPullDistance Header的高度:$refreshIndicatorExtent');

  if (refreshState == RefreshMode.refreshed && success) {
    return const Center(child: Text('refresh success!'));
  }
  if (refreshState == RefreshMode.inactive) {
    return const SizedBox();
  }
  switch (refreshState) {
    case RefreshMode.drag:
      if (pulledExtent <= 20) {
        return const SizedBox();
      }
      return Container(
        alignment: Alignment.bottomCenter,
        child: AnimatedSwitcher(
          duration: const Duration(milliseconds: 300),
          child: pulledExtent <= refreshTriggerPullDistance
              ? const Icon(
            Icons.arrow_downward_outlined,
          )
              : const Icon(
            Icons.arrow_upward_outlined,
          ),
        ),
      );

  /// 刷新中状态。
    case RefreshMode.refresh:
      return SizedBox(
        height: refreshIndicatorExtent,
        child: Center(child: kLoadingWidgetWithRefresh),
      );

  /// 可以执行刷新的操作了，直接返回一个loading。
    case RefreshMode.armed:
      return Center(
        child: kLoadingWidgetWithRefresh,
      );
    default:
      return Container();
  }
}