flutter 保存列表状态和控制列表状态

class DiscoverActivePageState extends State<DiscoverActivePage>
    with AutomaticKeepAliveClientMixin


  bool _wantKeepAlive = false;

  //IM消息提醒定时器
  Timer? _discoverTimer;

  @override
  bool get wantKeepAlive => _wantKeepAlive;

  //是否保持列表状态，不自动刷新
  canKeepListLive(){
  //设置列表保持状态
    _wantKeepAlive = true;
    updateKeepAlive();
    if (_discoverTimer != null) {
      _discoverTimer?.cancel();
    }
    _discoverTimer = Timer(const Duration(minutes: 1), () {
    //一分钟后又可以自动刷新列表
      _wantKeepAlive = false;
      updateKeepAlive();
    });
  }

  @override
  void dispose() {
    if(_discoverTimer!=null){
      _discoverTimer!.cancel();
    }
    super.dispose();
  }