Flutter: ListView not scrollable, not bouncing

Question

I have the following example (tested on an iPhone X, iOS 11):

import \'package:flutter/material.dart\';

void main() => runApp(new MyApp());

class MyApp exte         


        

Answer 1

I found a solution how to track the offset with lists that have a smaller content height than the viewport. Use a NotificationListener together with a CustomScrollView in the build() method like this:

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State {
  ScrollController _controller = new ScrollController();

  @override
  Widget build(BuildContext context) {
    return new NotificationListener(
      onNotification: _handleScrollPosition,
        child: new CustomScrollView(
            slivers: [
              new SliverList(
                  delegate: new SliverChildListDelegate([
                    new Container(
                      height: 40.0,
                      color: Colors.blue,
                    ),
                    new Container(
                      height: 40.0,
                      color: Colors.red,
                    ),
                    new Container(
                      height: 40.0,
                      color: Colors.green,
                    ),
                  ])
              )
            ]
        )
    );
  }

  bool _handleScrollPosition(ScrollNotification notification) {
    print(notification.metrics.pixels);
    return true;
  }
}

As long as there is no solution with a ScrollController only (or a "better" (more elegant)) solution, I will accept this as the answer.