Для ListView добавить заголовок столбца нужно особенно внимательно, пожалуйста, обратитесь к этому. Flutter: можно ли добавить строку заголовка в ListView фрагмент кода
Вернуть заголовок в качестве первой строки по itemBuilder:
ListView.builder(
itemCount: data == null ? 1 : data.length + 1,
itemBuilder: (BuildContext context, int index) {
if (index == 0) {
// return the header
return new Column(...);
}
index -= 1;
// return row
var row = data[index];
return new InkWell(... with row ...);
},
);
Заголовок столбца поддержки DataTable, который вы можете рассмотретьреализовать с DataTable, пожалуйста, проверьте пример ниже.
полный код
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: DataTableDemo(),
);
}
}
class User {
String firstName;
String lastName;
User({this.firstName, this.lastName});
static List<User> getUsers() {
return <User>[
User(firstName: "Aaryan", lastName: "Shah"),
User(firstName: "Ben", lastName: "John"),
User(firstName: "Carrie", lastName: "Brown"),
User(firstName: "Deep", lastName: "Sen"),
User(firstName: "Emily", lastName: "Jane"),
];
}
}
class DataTableDemo extends StatefulWidget {
DataTableDemo() : super();
final String title = "Data Table Flutter Demo";
@override
DataTableDemoState createState() => DataTableDemoState();
}
class DataTableDemoState extends State<DataTableDemo> {
List<User> users;
List<User> selectedUsers;
bool sort;
@override
void initState() {
sort = false;
selectedUsers = [];
users = User.getUsers();
super.initState();
}
onSortColum(int columnIndex, bool ascending) {
if (columnIndex == 0) {
if (ascending) {
users.sort((a, b) => a.firstName.compareTo(b.firstName));
} else {
users.sort((a, b) => b.firstName.compareTo(a.firstName));
}
}
}
onSelectedRow(bool selected, User user) async {
setState(() {
if (selected) {
selectedUsers.add(user);
} else {
selectedUsers.remove(user);
}
});
}
deleteSelected() async {
setState(() {
if (selectedUsers.isNotEmpty) {
List<User> temp = [];
temp.addAll(selectedUsers);
for (User user in temp) {
users.remove(user);
selectedUsers.remove(user);
}
}
});
}
SingleChildScrollView dataBody() {
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: DataTable(
sortAscending: sort,
sortColumnIndex: 0,
columns: [
DataColumn(
label: Text("FIRST NAME"),
numeric: false,
tooltip: "This is First Name",
onSort: (columnIndex, ascending) {
setState(() {
sort = !sort;
});
onSortColum(columnIndex, ascending);
}),
DataColumn(
label: Text("LAST NAME"),
numeric: false,
tooltip: "This is Last Name",
),
],
rows: users
.map(
(user) => DataRow(
selected: selectedUsers.contains(user),
onSelectChanged: (b) {
print("Onselect");
onSelectedRow(b, user);
},
cells: [
DataCell(
Text(user.firstName),
onTap: () {
print('Selected ${user.firstName}');
},
),
DataCell(
Text(user.lastName),
),
]),
)
.toList(),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
verticalDirection: VerticalDirection.down,
children: <Widget>[
Expanded(
child: dataBody(),
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Padding(
padding: EdgeInsets.all(20.0),
child: OutlineButton(
child: Text('SELECTED ${selectedUsers.length}'),
onPressed: () {},
),
),
Padding(
padding: EdgeInsets.all(20.0),
child: OutlineButton(
child: Text('DELETE SELECTED'),
onPressed: selectedUsers.isEmpty
? null
: () {
deleteSelected();
},
),
),
],
),
],
),
);
}
}
