Is there a way to add listeners in DefaultTabController? Is there a way to add listeners in DefaultTabController? dart dart

Is there a way to add listeners in DefaultTabController?


dart flutter

I use this:

new DefaultTabController(  child: Builder(    builder: (context) {         final tabController = DefaultTabController.of(context)!;      tabController.addListener(() {        print("New tab index: ${tabController.index}");      });          return Scaffold(        ...      );    }  ),);

dart flutter

  1. Define a tabController and a listener (once changing tab, it will be triggered twice)
class _ScreenState extends State<Screen> with SingleTickerProviderStateMixin {  late TabController tabController;  @override  void initState() {    super.initState();    this.tabController = TabController(length: 3, vsync: this);    this.tabController.addListener(() {      if (this.tabController.indexIsChanging) {        print(this.tabController.index);        print(this.tabController.previousIndex);      }    });  }}
  1. Pass it to the TabBar and TabBarView, like:
TabBar(  controller: this.tabController,  tabs: [   Tab(text: "0"),   Tab(text: "1"),   Tab(text: "2"),  ],)TabBarView(controller: this.tabController, children: [...])

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