timelines_page.dart
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import 'dart:convert';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:one_poem/timeline/models/friend_entity.dart';
import 'package:one_poem/timeline/widgets/friend_cell.dart';
import 'package:one_poem/timeline/widgets/header_view.dart';
class TimelinesPage extends StatefulWidget {
const TimelinesPage({Key? key}) : super(key: key);
@override
_TimelinesPageState createState() => _TimelinesPageState();
}
class _TimelinesPageState extends State<TimelinesPage>{
final ScrollController _scrollController = ScrollController();
double _opacity = 0;
FriendEntity _friendmodelEntity = FriendEntity();
Future<String> loadAsset() async {
return await rootBundle.loadString('lib/res/timeline/Data.json');
}
@override
void initState() {
super.initState();
loadAsset().then((value){
var json = jsonDecode(value);
_friendmodelEntity = FriendEntity.fromJson(json);
setState(() {});
});
_scrollController.addListener(() {
double alph = _scrollController.offset/200;
if (alph < 0) {
alph = 0;
} else if (alph > 1) {
alph = 1;
}
setState(() {
_opacity = alph;
});
});
}
Widget _mainListViewBuidler(BuildContext context , int index) {
return FriendCell(model: _friendmodelEntity.data![index],);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
ListView(
padding: const EdgeInsets.only(top: 0),
controller: _scrollController,
children: <Widget>[
const HeaderView(),
ListView.builder(padding: const EdgeInsets.only(top: 0), itemBuilder: _mainListViewBuidler , itemCount: _friendmodelEntity.data!.length, shrinkWrap: true, physics:NeverScrollableScrollPhysics(),)
],
),
Opacity(
opacity: _opacity,
child: const CupertinoNavigationBar(
middle: Text("朋友圈"),
),
)
],
),
);
}
}