https://pub.dev/packages/flutter_easyrefresh

flutter_easyrefresh 提供了一个专门用于自定义header的类：CustomHeader。

CustomHeader(
  headerBuilder: (
    BuildContext context,
    RefreshMode refreshState,
    double pulledExtent,
    double refreshTriggerPullDistance,
    double refreshIndicatorExtent,
    AxisDirection axisDirection,
    bool float,
    Duration? completeDuration,
    bool enableInfiniteRefresh,
    bool success,
    bool noMore,
  ) {
    final title = refreshState.toString();
    return Container(
      alignment: Alignment.center,
      color: Colors.orange,
      width: 100,
      height: 50,
      child: Text(
        title,
        style: const TextStyle(fontSize: 20),
      ),
    );
  },
),

我们可以根据 refreshState 做不同状态的处理。