Flutter Appbar (actions) with child tabs


I’m new in Flutter and I wonder if you can help me to find a solution to my problem.

I have a scaffold with a tabview and I want to make a filter (actions button) in the main appbar to manage tabs.

Both main and child are StatefulWidgets

here’s my code of the main page :

Widget body = TabBarView(
      controller: tabController,
      children: <Widget>[
        new First(filter: filter),
        new Second(filter: filter);
        new Third(filter: filter);
return Scaffold(
    appBar: AppBar(
           actions:[IconButton(icon: Icon(MdiIcons.filter),onPressed: 
           () {
              // Send info to child 
           bottom: new TabBar(
           controller: tabController,
           tabs: <Tab>[
             new Tab(text:"Tab1"),
             new Tab(text:"Tab2"),
             new Tab(text:"Tab3")
    body: new Builder(builder: (BuildContext context) {
      _scaffoldContext = context;
      return body;

Children page :

Widget body = Text("Filter name here");
return Scaffold(
  new Builder(
    builder: (context) {
      snack = new DisplaySnackBar(context: context);
      return body;

I don’t know where to put the actions of appbar to make Text on child’s body changes from the main page.


I found the solution by making my parent widget as an InheritedWidget so I can access to it’s data from child.

Here’s an example :

class MyStatefulWidget extends StatefulWidget{
  MyStatefulWidgetState createState() => MyStatefulWidgetState();

  static MyStatefulWidgetState of(BuildContext context){
    return (context.inheritFromWidgetOfExactType(_MyInheritedStateContainer) as _MyInheritedStateContainer).data;
class MyStatefulWidgetState extends State<MyStatefulWidget>{

String variableCalledHello = "Hello World";
  void initState() {
  Widget build(BuildContext context) {
   return new _MyInheritedStateContainer(data:this,child:/* Body here */);
class _MyInheritedStateContainer extends InheritedWidget{
Key key,
    @required Widget child,
    @required this.data,
  }) : super(key: key, child: child);

final MyStatefulWidgetState data;

  bool updateShouldNotify(_MyInheritedStateContainer oldWidget) {
    return true;

and for every child :

you just have to call MyStatefulWidgetState state = MyStatefulWidgetState.of(context);

example :

  Widget build(BuildContext context) {
   MyStatefulWidgetState state = MyStatefulWidgetState.of(context);


   return /* Container ... */;


Hope that will help someone to solve his problem.


Answered By – Simo.J

Answer Checked By – David Marino (FlutterFixes Volunteer)

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