I have a dart file with IndexedStack and the following function in the same file to change the stacks.

The file with method as follows-

  class RootApp extends StatefulWidget  with selectedTab {
  @override
  _RootAppState createState() => _RootAppState();
}


class _RootAppState extends State<RootApp> {
  int pageIndex = 0;
  List<Widget> pages = [
    ......
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    ....

    return AnimatedBottomNavigationBar(
      .......
      onTap: (index) {
        selectedTab(index);
      },
    );
  }

  selectedTab(index) {
    setState(() {
      pageIndex = index;
    });
  }
}

The other file is as follows---

class CreatBudgetPage extends StatefulWidget {
  @override
  _CreatBudgetPageState createState() => _CreatBudgetPageState();
}

class _CreatBudgetPageState extends State<CreatBudgetPage> {
  .......
    FirebaseFirestore.instance
        .collection('expenses/'   userId   '/'   todayDate)
        .add({
   ....
    }).then((_) {
      print("collection created");
      void rootApp() => selectedTab(0);
    }).catchError((error) {
      print(error);
    });
  }

How can i call this function from another dart file?

Edit: I tried the methods suggested by Rohith but they aren't working. So i have updated my dart file.

CodePudding user response：

You can import the file in which your function is in for example

import "IndexedTabs.dart";

void main() => selectedTab(index)

or you can use mixin like this

mixin SelectedTab {
  selectedTab(index) {
     setState(() {
        pageIndex = index;
      });
  }
}

In main file

class Main with selectedTab {
  void main() => selectedTab(index);
}

Update

This is in your main file

class RootApp extends StatefulWidget {
  @override
  _RootAppState createState() => _RootAppState();
}


class RootApp extends StatefulWidget {
  @override
  _RootAppState createState() => _RootAppState();
}


class _RootAppState extends State<RootApp> {
  int pageIndex = 0;
  List<Widget> pages = [
    
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BottomNavigationBar(
      items: [],
      onTap: (index) {
        setState(() {
          selectedTab(pageIndex, index);
        });
      },
    );
  }
}

This is the file with your function

void selectedTab(pageIndex, index) {
  pageIndex = index;
}

CodePudding user response：

just import the file then you can freely call any function or class in that file :

import 'yourfile.dart'

yourmethode();