flutter_widgets是由Google提供，但不是来自Flutter团队的第三方组件。

1	flutter_widgets: ^0.1.7+1

ScrollablePositionedList

ScrollablePositionedList类似ListView，提供滚动到指定元素的功能。

import 'package:flutter_widgets/flutter_widgets.dart';
ItemScrollController _itemScrollController;
  @override
  void initState() {
    super.initState();
    _itemScrollController = new ItemScrollController();
 }
 
if(messageList.length > 1) {
    _itemScrollController.jumpTo(index: messageList.length - 1);
}

ScrollablePositionedList.builder(
            padding: EdgeInsets.fromLTRB(16.0, 16.0, 60.0, 16.0),
            itemScrollController: _itemScrollController,
            itemCount: messageList.length - 1,
            itemBuilder: (context, index) {
              return _buildItem(context, index);
            }),

Google提供的Flutter_Widgets

ScrollablePositionedList

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