how to streambuilder auto scroll in send new message

Question

I'm creating an app that has a group chat section and I'm facing a problem I need when I send a new message it automatically scrolls to the last message I sent like chat apps ? This is my code

StreamBuilder<QuerySnapshot>(
        stream: _firestore.collection('messages').orderBy('time').snapshots(),
        builder: (context, snapshot){
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(
              child: Container(
                height: 40,
                width: 40,
                child: CircularProgressIndicator(),
              ),
            );
          }
          List<messageLine> messageWidgets = [];
          final messages = snapshot.data!.docs;
          for(var message in messages){
            final messageText = message.data().toString().contains('text') ? message.get('text') : '';
            final messagesender = message.data().toString().contains('sender') ? message.get('sender') : '';
            final currentUser = Signinuser.email;
            if (currentUser == messagesender){

            }
            final messageWidget = messageLine(sender: messagesender,text: messageText,isme: currentUser == messagesender,);
            messageWidgets.add(messageWidget);
          }
          return Expanded(
            child: Container(
              decoration: BoxDecoration(
                image: DecorationImage(
                  image: AssetImage('assets/chatBack.png'),
                  fit: BoxFit.cover
                )
              ),
              child: ListView(
                padding: EdgeInsets.symmetric(
                  horizontal: 10,vertical: 20
                ),
                children: messageWidgets
              ),
            ),
          );
        },),