forked from lxm_flutter/FlutterUnit
初步优化项目结构
This commit is contained in:
@@ -0,0 +1,86 @@
|
||||
import 'package:flutter/material.dart';
|
||||
|
||||
/// create by 张风捷特烈 on 2020/9/21
|
||||
/// contact me by email 1981462002@qq.com
|
||||
/// 说明: 350 BoxScrollView 盒滑动视图
|
||||
/// BoxScrollView 类是一个继承自 ScrollView 的抽象类,所以无法直接使用,它的子类有 ListView、GridView。一般不自己实现子类使用它。
|
||||
/// link 183,162,163
|
||||
///
|
||||
// {
|
||||
// "widgetId": 350,
|
||||
// "name": 'BoxScrollView 介绍',
|
||||
// "priority": 1,
|
||||
// "subtitle":
|
||||
// "【reverse】 : 是否反向 【bool】\n"
|
||||
// "【scrollDirection】 : 滑动方向 【Axis】\n"
|
||||
// "【cacheExtent】 : 缓存长 【double】\n"
|
||||
// "【dragStartBehavior】 : 拖动行为 【DragStartBehavior】\n"
|
||||
// "【clipBehavior】 : 裁剪行为 【ClipBehavior】\n"
|
||||
// "【controller】 : 控制器 【ScrollController】",
|
||||
// }
|
||||
|
||||
class BoxScrollViewDemo extends StatelessWidget {
|
||||
|
||||
final String info =
|
||||
'BoxScrollView 是 ScrollView 的子类,实现了它的抽象方法,且暴露出另一个抽象方法 buildChildLayout,返回 Sliver 家族 Widget,'
|
||||
'其子类有 ListView 和 GridView,分别使用 Sliver 家族相关List、Gird列表组件实现的。';
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return Container(
|
||||
height: 300,
|
||||
child: Column(
|
||||
children: [
|
||||
Container(
|
||||
color: Colors.blue.withOpacity(0.1),
|
||||
padding: EdgeInsets.all(10),
|
||||
margin: EdgeInsets.all(10),
|
||||
child: Text(info),
|
||||
),
|
||||
Expanded(child: MyBoxScrollView()),
|
||||
],
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
class MyBoxScrollView extends BoxScrollView {
|
||||
|
||||
final List<Color> data = [
|
||||
Colors.purple[50]!,
|
||||
Colors.purple[100]!,
|
||||
Colors.purple[200]!,
|
||||
Colors.purple[300]!,
|
||||
Colors.purple[400]!,
|
||||
Colors.purple[500]!,
|
||||
Colors.purple[600]!,
|
||||
Colors.purple[700]!,
|
||||
Colors.purple[800]!,
|
||||
Colors.purple[900]!,
|
||||
];
|
||||
|
||||
String colorString(Color color) =>
|
||||
"#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
|
||||
|
||||
@override
|
||||
Widget buildChildLayout(BuildContext context)=> SliverFixedExtentList(
|
||||
itemExtent: 60,
|
||||
delegate: SliverChildBuilderDelegate(
|
||||
(_, int index) => Container(
|
||||
alignment: Alignment.center,
|
||||
width: 100,
|
||||
height: 50,
|
||||
color: data[index],
|
||||
child: Text(
|
||||
colorString(data[index]),
|
||||
style: TextStyle(color: Colors.white, shadows: [
|
||||
Shadow(
|
||||
color: Colors.black,
|
||||
offset: Offset(.5, .5),
|
||||
blurRadius: 2)
|
||||
]),
|
||||
),
|
||||
),
|
||||
childCount: data.length),
|
||||
);
|
||||
}
|
||||
Reference in New Issue
Block a user