title: Get Value of child in ListWheelScrollView
body: <p>I am trying to get the value of the child text widget, or even if there is a way to get the value from the List that I populate the Text widgets from. when you scroll and the wheel stops, I would like to extract the value of the selectedItem.</p>
  
  <p>As I use infinite scroll I cannot map the value of the selectedItem to the List</p>
  
  <pre><code>import 'package:flutter/material.dart';
  
  void main() =&gt; runApp(MyApp());
  
  class MyApp extends StatefulWidget {
    @override
    _MyAppState createState() =&gt; _MyAppState();
  }
  
  class _MyAppState extends State&lt;MyApp&gt; {
    FixedExtentScrollController fixedExtentScrollController =
        new FixedExtentScrollController();
  
  // I would like to get one of these values
    List&lt;String&gt; numbers = [
      'one',
      'two',
      'three',
      'four',
      'five',
      'six',
      'seven',
      'eight',
      'nine'
    ];
  
  
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        color: Colors.white,
        home: Center(
          child: Container(
            height: 800.0,
            width: 250.0,
            child: ListWheelScrollView.useDelegate(
              itemExtent: 100,
              controller: fixedExtentScrollController,
              physics: FixedExtentScrollPhysics(),
              onSelectedItemChanged: (_) {
                print(fixedExtentScrollController.selectedItem.);
              },
              childDelegate: ListWheelChildLoopingListDelegate(
                children: &lt;Widget&gt;[
                  ...numbers.map((String number) {
                    return Container(
                      height: 100.0,
                      color: Colors.green,
                      child: Center(
                        child: Text( 
                          number,  //Here is the child value I would like to get
                          style: TextStyle(
                              fontSize: 24.0,
                              color: Colors.black,
                              fontWeight: FontWeight.normal,
                              fontStyle: FontStyle.normal,
                              decoration: TextDecoration.none),
                        ),
                      ),
                    );
                  })
                ],
              ),
            ),
          ),
        ),
      );
    }
  } 
  </code></pre>