Listview 实现基于时间轴的可撤销ListTile小部件
注意:在开始提问之前,我想让每个人都了解 问题是,我的最终目标是:Listview 实现基于时间轴的可撤销ListTile小部件,listview,flutter,flutter-layout,Listview,Flutter,Flutter Layout,注意:在开始提问之前,我想让每个人都了解 问题是,我的最终目标是: 开发一个反应式listile小部件,通过更改其当前状态来响应来自后端的事件 我把这个留给另一个问题。现在,这是我的目标 目标:设计一个statefull小部件,该小部件具有多个自定义组件,如圆形和与时间轴相关的小部件 并将其放置在一个可撤销列表文件中和其他组件一起,如下面的屏幕截图所示 到目前为止,我已经用Dismissable listile实现了ListView屏幕,其中包含了先前设计中显示的文本小部件 以下是我目前
- 开发一个反应式
小部件,通过更改其当前状态来响应来自后端的事件listile
目标:设计一个
statefull
小部件,该小部件具有多个自定义组件,如圆形和与时间轴相关的小部件
并将其放置在一个可撤销列表文件中
和其他组件一起,如下面的屏幕截图所示
到目前为止,我已经用Dismissable listile
实现了ListView
屏幕,其中包含了先前设计中显示的文本
小部件
以下是我目前拥有的代码:
ListView.builder(
itemCount: _items.length,
itemBuilder: (context, index) {
final String item = _items[index];
return Dismissible(
direction: DismissDirection.startToEnd,
key: Key(item),
onDismissed: (DismissDirection dir) {
setState(() => this._items.removeAt(index));
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(dir == DismissDirection.startToEnd
? '$item removed.'
: '$item liked.'),
action: SnackBarAction(
label: 'UNDO',
onPressed: () {
setState(() => this._items.insert(index, item));
},
),
),
);
},
background: Container(
color: Colors.red,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FaIcon(
FontAwesomeIcons.times,
color: kWhite,
),
SizedBox(
height: 10,
),
Text(
'Cancel Order',
style: TextStyle(color: kWhite),
)
],
),
alignment: Alignment.centerLeft,
),
child: ListTile(
//CustomeTimeLineWidget goes here innstead of the container
title: Container(
child: Column(
children: <Widget>[
Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Order No: 002345',
),
Text('items no: 12'),
],
),
SizedBox(
height: 20,
),
Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Order Total: 20000',
),
Text('17/04/2020'),
],
),
],
),
),
),
);
},
),
ListView.builder(
itemCount:_items.length,
itemBuilder:(上下文,索引){
最终字符串项=_项[索引];
可驳回的回报(
方向:DismissDirection.startToEnd,
键:键(项),
onDismissed:(DismissDirection目录){
设置状态(()=>this._items.removeAt(index));
Scaffold.of(上下文).showSnackBar(
小吃条(
内容:Text(dir==DismissDirection.startToEnd
?“$项已删除。”
:“$item liked”。),
行动:SnackBarAction(
标签:“撤消”,
已按下:(){
设置状态(()=>this.\u items.insert(index,item));
},
),
),
);
},
背景:集装箱(
颜色:颜色,红色,
子:列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
法肯(
FontAwesomeIcons.times,
颜色:kWhite,
),
大小盒子(
身高:10,
),
正文(
“取消订单”,
样式:TextStyle(颜色:kWhite),
)
],
),
对齐:alignment.centerLeft,
),
孩子:ListTile(
//CustomeTimeLineWidget在这里代替容器
标题:集装箱(
子:列(
儿童:[
划船(
mainAxisSize:mainAxisSize.max,
mainAxisAlignment:mainAxisAlignment.spaceBetween,
儿童:[
正文(
‘订单编号:002345’,
),
文本(“项目编号:12”),
],
),
大小盒子(
身高:20,
),
划船(
mainAxisSize:mainAxisSize.max,
mainAxisAlignment:mainAxisAlignment.spaceBetween,
儿童:[
正文(
“订单总数:20000”,
),
文本('17/04/2020'),
],
),
],
),
),
),
);
},
),
这是从代码中得到的设计
尝试过的解决方案:
我考虑过使用时间线包,但它显示的是垂直时间线,而不是水平时间线
问题:我需要实现时间线(每个列表中的圆圈)
我已经根据您的需要在每个列表中添加了圆圈
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:intl/intl.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
body: SafeArea(
child: MyHomePage(),
),
),
);
}
}
const kWhite = Colors.white;
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final _items = <Order>[
Order(
id: 'id-1',
date: DateTime.now(),
number: 12,
intemNo: 20,
orderTotal: 20000,
status: OrderStatus.inProgress,
),
Order(
id: 'id-2',
date: DateTime.now().subtract(Duration(days: 10)),
number: 10,
intemNo: 2,
orderTotal: 5000,
status: OrderStatus.delivered,
),
];
DateFormat dateFormate = DateFormat.yMd();
@override
Widget build(BuildContext context) {
return ListView.separated(
separatorBuilder: (context, index) => Divider(
indent: 10.0,
endIndent: 10.0,
color: Colors.black,
),
itemCount: _items.length,
itemBuilder: (context, index) {
var item = _items[index];
return Dismissible(
direction: DismissDirection.startToEnd,
key: Key(item.id),
onDismissed: (dir) {
setState(() => _items.removeAt(index));
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(dir == DismissDirection.startToEnd
? '$item removed.'
: '$item liked.'),
action: SnackBarAction(
label: 'UNDO',
onPressed: () {
setState(() => _items.insert(index, item));
},
),
),
);
},
background: Container(
color: Colors.red,
padding: EdgeInsets.all(10),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FaIcon(
FontAwesomeIcons.times,
color: kWhite,
),
SizedBox(
height: 10,
),
Text(
'Cancel \n Order',
style: TextStyle(color: kWhite),
)
],
),
alignment: Alignment.centerLeft,
),
child: ListTile(
title: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Order No: ${item.number}',
),
Text('items no: ${item.intemNo}'),
],
),
SizedBox(
height: 20,
),
Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Order Total: ${item.orderTotal}',
),
Text(dateFormate.format(item.date)),
],
),
SizedBox(
height: 20,
),
StatusBar(
status: item.status,
)
],
),
),
),
);
},
);
}
}
class StatusBar extends StatelessWidget {
const StatusBar({Key key, this.status}) : super(key: key);
final OrderStatus status;
final List<String> titles = const [
'waiting',
'in progress',
'delivering',
'delivered'
];
@override
Widget build(BuildContext context) {
var checkedCount = _getCheckedCount(status);
var elements = List<bool>.generate(4, (i) => i < checkedCount);
return Column(
children: <Widget>[
Stack(
children: [
Positioned(
top: 25,
left: 10,
right: 10,
child: Container(
height: 4,
color: Colors.black38,
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: elements
.asMap()
.map((index, isChecked) => MapEntry(
index,
Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Colors.deepOrange,
),
alignment: Alignment.center,
width: 50,
height: 50,
child: isChecked
? FaIcon(
FontAwesomeIcons.check,
color: kWhite,
)
: null,
),
Text(titles[index])
],
),
))
.values
.toList(),
),
],
),
],
);
}
_getCheckedCount(OrderStatus status) {
switch (status) {
case OrderStatus.waiting:
return 1;
case OrderStatus.inProgress:
return 2;
case OrderStatus.deliviring:
return 3;
case OrderStatus.delivered:
return 4;
}
}
}
class Order {
final String id;
final int number;
final int intemNo;
final int orderTotal;
final DateTime date;
final OrderStatus status;
Order({
@required this.id,
@required this.number,
@required this.intemNo,
@required this.orderTotal,
@required this.date,
@required this.status,
});
}
enum OrderStatus { waiting, inProgress, deliviring, delivered }
导入“包装:颤振/材料.省道”;
导入“package:font_awesome_flatter/font_awesome_flatter.dart”;
导入“包:intl/intl.dart”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
家:脚手架(
正文:安全区(
子:MyHomePage(),
),
),
);
}
}
const kWhite=Colors.white;
类MyHomePage扩展StatefulWidget{
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
最终项目=[
命令(
id:'id-1',
日期:DateTime.now(),
编号:12,
国际编号:20,
订单总数:20000,
状态:OrderStatus.inProgress,
),
命令(
id:'id-2',
日期:DateTime.now().subtract(持续时间(天:10)),
编号:10,
国际:2,
订单总数:5000,
状态:OrderStatus.delivered,
),
];
DateFormat DateFormat=DateFormat.yMd();
@凌驾
小部件构建(构建上下文){
返回ListView.separated(
separatorBuilder:(上下文,索引)=>分隔符(
缩进:10.0,
收尾缩进:10.0,
颜色:颜色,黑色,
),
itemCount:_items.length,
itemBuilder:(上下文,索引){
var项目=_项目[索引];
可驳回的回报(
方向:DismissDirection.startToEnd,
密钥:密钥(项目id),
onDismissed:(dir){
设置状态(()=>_items.removet(索引));
Scaffold.of(上下文).showSnackBar(
小吃条(
内容:Text(dir==DismissDirection.startToEnd
?“$项已删除。”
:“$item liked”。),
行动:SnackBarAction(
标签:“撤消”,
已按下:(){
设置状态(()=>_items.insert(index,item));
},
),
),
);
},
背景:集装箱(
颜色:颜色,红色,
填充:边缘设置。全部(10),
子:列(
mainAxisAlignment:mainAxisAlignment.center,
中国