Question 415311 in Flutter Question posted in
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How to execute cubit function from a void function of a class in Flutter

how you are calling a cubit function from a void function of stateless/ful widget. I assume in an ideal world all functions should be placed in cubits but similar to context.read<MyCubit>().myfunction(); which i can use in onpressed of a Button Widget i need a way to execute the cubit function from a void function. Is that possible?

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2

Answers


  1. 0

    To call a Cubit function from a void function in Flutter Pass BuildContext to your function

    void _onPressed(BuildContext context) {
  context.read<MyCubit>().myFunction();
}

    Call the function when needed, like in an onPressed event:

    ElevatedButton(
  onPressed: () => _onPressed(context),
  child: Text('Call Cubit'),
)
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  2. 0

    I saw your comment but couldn’t reply directly due to insufficient reputation, so I’m posting this answer.

    You can call a Cubit function from a void method without passing BuildContext by storing the Cubit instance in your State class. Here’s how:

    Solution: Initialize the Cubit in didChangeDependencies

    1.Declare the Cubit variable in your State class:

    class _MyWidgetState extends State<MyWidget> {
  late MyCubit _myCubit;

  // Other state variables and methods...
}

    2.Initialize the Cubit in didChangeDependencies:

    @override
void didChangeDependencies() {
  super.didChangeDependencies();
  _myCubit = context.read<MyCubit>();
}

    Explanation: didChangeDependencies is called after initState and whenever the dependencies change. It’s safe to use context here, ensuring that the Cubit is properly initialized before you use it.

    3.Use the Cubit in your void method without BuildContext:

    void _handleStateChange(AppLifecycleState state) {
  if (state == AppLifecycleState.paused) {
    _myCubit.myFunction();
  }
}

    Note: Ensure that MyCubit is provided above your widget in the widget tree using BlocProvider:

    BlocProvider(
  create: (context) => MyCubit(),
  child: MyWidget(),
);

    Alternative Option: You can also fix this issue using the get_it package if you prefer a global access approach.

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