keep state inside SearchDelegate

@OverRide

I have FutureBuilder>>ListView widgets Inside @OverRide buildResults(BuildContext context) method. I navigate to a new screen on list view item tap. but when i pop from the new screen the future is called again. Also i have pagination in the main list view, so when the user tap on item 100 for ex. after popping from the new screen, the main listview it will rebuild from the beginning

class DataSearch extends SearchDelegate<String>{
  
  @override
  List<Widget> buildActions(BuildContext context) {
    return [
      IconButton(
          icon: Icon(Icons.clear),
          onPressed: () {
            query = '';
          })
    ];
  }

  @override
  ThemeData appBarTheme(BuildContext context) {
    final ThemeData theme = Theme.of(context);
    return theme.copyWith(
        inputDecorationTheme: InputDecorationTheme(
            hintStyle: TextStyle(color: theme.primaryTextTheme.title.color)),
        primaryColor: theme.primaryColor,
        primaryIconTheme: theme.primaryIconTheme,
        primaryColorBrightness: theme.primaryColorBrightness,
        primaryTextTheme: theme.primaryTextTheme,
        textTheme: theme.textTheme.copyWith(
            title: theme.textTheme.title
                .copyWith(color: theme.primaryTextTheme.title.color)));
  }

  @override
  Widget buildLeading(BuildContext context) {
    return IconButton(
        icon: AnimatedIcon(
            icon: AnimatedIcons.menu_arrow, progress: transitionAnimation),
        onPressed: () {
          close(context, null);
        });
  }

  @override
  Widget buildResults(BuildContext context) {
     SearchProvider searchProvider =
        Provider.of<SearchProvider>(context, listen: false);

    return query.isEmpty == true ? Container() : FutureBuilder(
        future:  searchProvider.fetchData(query),
        builder: (context, snapshot) {
          switch (snapshot.connectionState) {
            case ConnectionState.waiting:
              return Center(
                  child: SpinKitHourGlass(
                color: Colors.greenAccent,
              ));
              break;
            default:
              if (snapshot.hasError) {
                return Center(child: Text("Error: ${snapshot.error}"));
              } else {
                return Consumer<SearchProvider>(
                  builder: (context, provider, child) => ImageList(
                    models: snapshot.data,
                    isSearch: true,
                  ),
                );
              }
          }
        });
  }

  @override
  Widget buildSuggestions(BuildContext context) {
    return Container();
  }
}

I have tried to wrap the Futurebuilder widget inside a statefull widget and use AutomaticKeepAliveClientMixin but in vain

class SearchWidget extends StatefulWidget {
  final String query;
  SearchWidget(this.query);
  @override
  _SearchWidgetState createState() => _SearchWidgetState();
}

class _SearchWidgetState extends State<SearchWidget>
    with AutomaticKeepAliveClientMixin {
  Future _future;
  @override
  void initState() {
    super.initState();
    SearchProvider searchProvider =
        Provider.of<SearchProvider>(context, listen: false);
    _future = searchProvider.fetchData(widget.query);
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return FutureBuilder(
        future: _future,
        builder: (context, snapshot) {
          switch (snapshot.connectionState) {
            case ConnectionState.waiting:
              return Center(
                  child: SpinKitHourGlass(
                color: Colors.greenAccent,
              ));
              break;
            default:
              if (snapshot.hasError) {
                return Center(child: Text("Error: ${snapshot.error}"));
              } else {
                return Consumer<SearchProvider>(
                  builder: (context, provider, child) => ImageList(
                    models: snapshot.data,
                    isSearch: true,
                  ),
                );
              }
          }
        });
  }

  @override
  bool get wantKeepAlive => true;
}

Would like to see this feature get implemented! Thanks!

This is really important to us
I hope it gets implemented

Any possible workaround for this?

I also facing this issue. Hopefully this can be implemented.

I am also facing this issue. I am passing a list to search delegate , and if query does not have the item in the list, I need to add this to the list and reload the list again . Do we have any kind of "state" in search delegate?

ctrl click on SearchDelegate it will open class material\search.dart
change bool get maintainState => false;
to bool get maintainState => true;

I am also facing this issue. Please implement this.

我一直以为是我学艺不精，原来是源码有问题^_^!

I'm having the same issue too!

I have the same issue

I also have the same issue. Is there an alternative to copying search.dart?

fix: add parameter to maintainState of SearchDelegate

fix: add parameter to maintainState of SearchDelegate (#152444)

fix: add parameter to maintainState of SearchDelegate (flutter#152444)

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

fix: add parameter to maintainState of SearchDelegate (flutter#152444)

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mohamed6996 commented on Oct 27, 2019

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