Ckeckbox inside menu actions in flutter is not updated until I reopen the menu again

Issue

Here is the relevant part of code:

class QuestionsScreen extends StatefulWidget {
  @override
  QuestionsScreenState createState() => QuestionsScreenState();
}

    class QuestionsScreenState extends State<QuestionsScreen> {
      final List<Question> questions = [];
      bool offline = false;
    
      @override
      Widget build(BuildContext context) {
        return BlocProvider(
          create: (context) => QuestionsBloc(sl.get<QuestionsRepository>())
            ..add(QuestionsInitialLoad()),
          child: Scaffold(
            appBar: AppBar(
              title: Text('StackOverflow Questions'),
              centerTitle: true,
              actions: <Widget>[
                PopupMenuButton<int>(
                    itemBuilder: (BuildContext context) => <PopupMenuItem<int>>[
                          new PopupMenuItem<int>(value: 1, child: Text('Refresh')),
                          new PopupMenuItem<int>(
                              value: 2,
                              child: new Row(children: <Widget>[
                                new Text("Offline"),
                                new Checkbox(
                                  value: offline,
                                  onChanged: (newValue) {
                                    setState(() {
                                      offline = newValue!;
                                    });
                                  }, //  <-- leading Checkbox
                                )
                              ])),
                        ],
                    onSelected: (int value) {
                      setState(() {
                        if (value == 1) {
                          questions.clear();
                          QuestionsBloc(sl.get<QuestionsRepository>())
                            ..add
                            ..isFetching = true
                            ..add(QuestionsRestart());
                        }
                      });
                    })
              ],
            ),
            body: QuestionsBody(questions, offline),
          ),
        );
      }
    }

As you can see, I have a checkbox declared inside the pop menu actions button of the scaffold appbar in flutter. When I click on it, the update happens, but I cannot see the update until I reopen the menu again. It is possible to see the update of the checkbox in the popup menu right away? Thanks.

Solution

This is how it looks on dev-tools after clicking PopupMenuButton

enter image description here

PopupMenuItem is not within the current context.

We can use StatefulBuilder to handle cases like this, In this case wrap CheckBox with StatefulBuilder. You can also choose on Row.

StatefulBuilder(
    builder: (context, setStateSB) => Checkbox(
          value: offline,
          onChanged: (newValue) {
            setStateSB(() {
              offline = newValue!; // to update checkbox
            });
            setState(() {
              offline = newValue!; //to update the main ui if needed
            });
          },
        )),

Answered By – Yeasin Sheikh

Answer Checked By – Marie Seifert (FlutterFixes Admin)

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