forked from lxm_flutter/FlutterUnit
128 lines
3.9 KiB
Dart
128 lines
3.9 KiB
Dart
import 'dart:math';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/9/21
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/// contact me by email 1981462002@qq.com
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/// 说明: 303 CupertinoSliverRefreshControl Sliver刷新控制器 iOS风格的下拉刷新控制器，可执行异步刷新方法、自定义控制器组件、指示器停留高度和触发加载的滑动高度。
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// {
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// "widgetId": 303,
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// "name": '刷新控制器基本使用',
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// "priority": 1,
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// "subtitle":
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// "【refreshIndicatorExtent】 : 加载中指示器高度 【double】\n"
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// "【refreshTriggerPullDistance】 : 触发加载的滑动高度 【double】\n"
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// "【onRefresh】 : 下拉事件 【RefreshCallback】\n"
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// "【builder】 : 指示器构造器 【RefreshControlIndicatorBuilder】",
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// }
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class CupertinoSliverRefreshControlDemo extends StatefulWidget {
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@override
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_CupertinoSliverRefreshControlDemoState createState() =>
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_CupertinoSliverRefreshControlDemoState();
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}
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class _CupertinoSliverRefreshControlDemoState
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extends State<CupertinoSliverRefreshControlDemo> {
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final data = <Color>[
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Colors.orange[50],
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Colors.orange[100],
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Colors.orange[200],
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Colors.orange[300],
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Colors.orange[400],
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Colors.orange[500],
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Colors.orange[600],
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Colors.orange[700],
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Colors.orange[800],
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Colors.orange[900],
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];
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final r = Random();
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@override
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Widget build(BuildContext context) {
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return Container(
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height: 300,
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child: CustomScrollView(
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physics: BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),
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slivers: <Widget>[
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_buildSliverAppBar(),
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CupertinoSliverRefreshControl(
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refreshIndicatorExtent: 60,
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refreshTriggerPullDistance: 80,
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onRefresh: _doRefresh,
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),
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_buildSliverList()
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],
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),
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);
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}
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Widget _buildSliverList() => SliverFixedExtentList(
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itemExtent: 50,
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delegate: SliverChildBuilderDelegate(
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(_, int index) => Container(
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alignment: Alignment.center,
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width: 100,
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height: 60,
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color: data[index],
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child: Text(
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colorString(data[index]),
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style: TextStyle(color: Colors.white, shadows: [
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Shadow(
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color: Colors.black,
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offset: Offset(.5, .5),
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blurRadius: 2)
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]),
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),
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),
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childCount: data.length),
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);
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Widget _buildSliverAppBar() {
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return SliverAppBar(
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expandedHeight: 120.0,
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leading: Container(
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margin: EdgeInsets.all(10),
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child: Image.asset('assets/images/icon_head.webp')),
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title: Text('张风捷特烈'),
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actions: _buildActions(),
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elevation: 5,
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pinned: true,
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backgroundColor: Colors.orange,
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flexibleSpace: FlexibleSpaceBar(
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//伸展处布局
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titlePadding: EdgeInsets.only(left: 55, bottom: 15), //标题边距
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collapseMode: CollapseMode.parallax, //视差效果
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background: Image.asset(
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"assets/images/caver.webp",
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fit: BoxFit.cover,
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),
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),
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);
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}
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List<Widget> _buildActions() => <Widget>[
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IconButton(
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onPressed: () {},
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icon: Icon(
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Icons.star_border,
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color: Colors.white,
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),
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)
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];
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String colorString(Color color) =>
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"#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
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Color randomColor() => Color.fromARGB(
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r.nextInt(255), r.nextInt(255), r.nextInt(255), r.nextInt(255));
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Future<void> _doRefresh() async {
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await Future.delayed(Duration(seconds: 2));
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setState(() {
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data.insertAll(0, [randomColor()]);
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});
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}
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}
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