Question 77078 in Flutter Question posted in
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Flutter Implementation of Isolates/compute inside stack of widgets – 'List<Future<Widget>>' can't be assigned to the parameter type 'List<Widget>'

The argument type ‘List<Future>’ can’t be assigned to the parameter type ‘List’

return SizedBox( width: screenSize.width, height: screenSize.height, child: Stack( alignment: Alignment.topLeft, children: listOfWidgets) );

listOfWidgets for example 10 widgets, each widget having one isolate and one compute which are running following function

String Calculate(int num){ int sum=num+num; return sum.toString(); }
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2

Answers


  1. 0

    in each widget i am planing to use 10 isolates. how it is possible to
    use 10 isolates with one future builder?

    you can try Future.wait

    Future<String> foo;
Future<int> bar;
FutureBuilder(
  future: Future.wait([bar, foo]), // here your future function
  builder: (context, AsyncSnapshot<List<dynamic>> snapshot) {
    snapshot.data[0]; //bar
    snapshot.data[1]; //foo
  },
);
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  2. 0

    try this:

    Stack(
  children: listOfWidgets.map(
    (future) => FutureBuilder<Widget>(
      future: future,
      builder: (context, snapshot) {
        if (snapshot.connectionState != ConnectionState.done) {
          return const CircularProgressIndicator();
        }
        if (snapshot.hasError || !snapshot.hasData) {
          return const Text('something went wrong');
        }
        return snapshot.data!;
      }
    ),
  ).toList()
),
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