我想NestedScrollView
内ListView
有SliverAppBar
折叠。但是,如果我一个控制器添加到ListView
,它停止工作(AppBar
不塌陷)。在此处,留下ListView
不影响SliverAppBar
一个例子,但右ListView
一样。SliverAppBar和Listview与控制器
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(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
ScrollController scrollController = new ScrollController();
List<String> entries = ["a", "b", "c", "d", "e", "a", "b", "c", "d", "e"];
@override
Widget build(BuildContext context) {
return new DefaultTabController(
length: 2,
child: new Scaffold(
body: new NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
new SliverAppBar(
title: new Text("My app"),
pinned: true,
expandedHeight: 150.0,
floating: true,
forceElevated: innerBoxIsScrolled,
bottom: new TabBar(
tabs: <Tab>[
new Tab(text: "FIRST"),
new Tab(text: "SECOND"),
],
)),
];
},
body: new TabBarView(
children: <Widget>[
new ListView.builder(
itemCount: entries.length,
controller: scrollController,
itemExtent: 60.0,
itemBuilder: (buildContext, index) {
return new Text(entries[index]);
},
),
new ListView.builder(
itemCount: entries.length,
itemExtent: 60.0,
itemBuilder: (buildContext, index) {
return new Text(entries[index]);
},
),
],
),
),
),
);
}
}
你有什么想法,如果有可能有一个控制器连接到ListView
,仍然通知NestedScrollView
?
它工作正常,你的滚动焦点只转移到孩子提供控制器后,尝试在触摸第一个选项卡,看看我的意思是滚动。你为什么不提供控制器来独占父代? – aziza
哦,你是对的,所以基本上如果我有一个控制器,它需要连接到NestedScrollView而不是ListView控件。如果我真的想将控制器附加到listview而不是scrollview,该怎么办?你知道这有可能吗? –
你想要做什么? – aziza