Flutter Appbar (actions) with child tabs - tabs

Question

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(
body:
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.

Answer 1

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{
#override
MyStatefulWidgetState createState() => MyStatefulWidgetState();
static MyStatefulWidgetState of(BuildContext context){
return (context.inheritFromWidgetOfExactType(_MyInheritedStateContainer) as _MyInheritedStateContainer).data;
}
}
class MyStatefulWidgetState extends State<MyStatefulWidget>{
String variableCalledHello = "Hello World";
#override
void initState() {
super.initState();
}
#override
Widget build(BuildContext context) {
return new _MyInheritedStateContainer(data:this,child:/* Body here */);
}
}
class _MyInheritedStateContainer extends InheritedWidget{
_MyInheritedStateContainer({
Key key,
#required Widget child,
#required this.data,
}) : super(key: key, child: child);
final MyStatefulWidgetState data;
#override
bool updateShouldNotify(_MyInheritedStateContainer oldWidget) {
return true;
}
}
and for every child :
you just have to call MyStatefulWidgetState state = MyStatefulWidgetState.of(context);
example :
#override
Widget build(BuildContext context) {
MyStatefulWidgetState state = MyStatefulWidgetState.of(context);
print(state.variableCalledHello);
return /* Container ... */;
}
Hope that will help someone to solve his problem.
Thanks.