how could I place a conditional for next action-CodePudding

I would like to condition the sign out action depending If I have already or not sign in. I just tried with an "If" before everything but it show a "expected identifier" and "expected )". I would like to learn abut this part

I tried with an "If" conditional before PopUp menu.

appBar: AppBar(

            title: Text("Categoria"),
            backgroundColor: Color.fromARGB(150, 255, 0, 0),

              if (FirebaseAuth.instance.signInWithEmailAndPassword(email: "usu" password: "cla"))
                {
                actions: [

                PopupMenuButton(

                onSelected: (Menu item) {
                setState(() {
                if (item == Menu.logout) {
                FirebaseAuth.instance.signOut();
                Navigator.push(context, MaterialPageRoute(
                builder: (context) => Login()));
                }
                });
                },
                itemBuilder: (BuildContext context) =>
                <PopupMenuEntry<Menu>>[
                PopupMenuItem(value: Menu.logout,
                child: Text("Cerrar sesión")
                )
                ],
                )

                ],
                }
          ),

Here is a screen of the code

CodePudding user response：

You can check the current auth state:

FirebaseAuth.instance
  .authStateChanges()
  .listen((User? user) {
    if (user == null) {
      print('User is currently signed out!');
    } else {
      print('User is signed in!');
    }
  });

CodePudding user response：

put the above the line of PopupMenuButton

           title: Text("Categoria"),
            backgroundColor: Color.fromARGB(150, 255, 0, 0),


                
                actions: [
                if (FirebaseAuth.instance.signInWithEmailAndPassword(email: "usu" password: "cla"))
                PopupMenuButton(

                onSelected: (Menu item) {
                setState(() {
                if (item == Menu.logout) {
                FirebaseAuth.instance.signOut();
                Navigator.push(context, MaterialPageRoute(
                builder: (context) => Login()));
                }
                });
                },
                itemBuilder: (BuildContext context) =>
                <PopupMenuEntry<Menu>>[
                PopupMenuItem(value: Menu.logout,
                child: Text("Cerrar sesión")
                )
                ],
                )

                ],
                
          ),

you can use if clause only like that after return part:

return Column(
  children: [
    if(condition == true) // or you just can write condition
    Text('true')
  ]
)

or you can use ? and :

return Container(
  child: 
  condition == true // or you just can write condition
  ? Text('true')
  : Text('false')
)