我是新手，扑朔迷离。我创建了一个Navigation Drawer，它具有多个选择。在每个抽屉中，我都有一个屏幕，其中包含List来自server的数据。
现在，我想将Search Icon添加到Navigation Bar到Editfield中，以过滤列表详细信息并在Navigation Drawer上任何选定项目的屏幕上进行更新。
请帮帮我..将不胜感激。
NavigationDrawer屏幕
import 'package:flutter/material.dart';
import 'package:innovation_bridge/fragments/AnnouncementsScreen.dart';
import 'package:innovation_bridge/fragments/AttendeesScreen.dart';
import 'package:innovation_bridge/fragments/BookmarksScreen.dart';
import 'package:innovation_bridge/fragments/ExibitorsScreen.dart';
import 'package:innovation_bridge/fragments/HomeScreen.dart';
import 'package:innovation_bridge/fragments/InnovationsScreen.dart';
import 'package:innovation_bridge/fragments/MeetingsScreen.dart';
import 'package:innovation_bridge/fragments/PrivacyPolicyScreen.dart';
import 'package:innovation_bridge/fragments/ProgramScreen.dart';
import 'package:innovation_bridge/fragments/SpeedSessionScreen.dart';
import 'package:innovation_bridge/fragments/TermsConditionsScreen.dart';
import 'package:innovation_bridge/utils/Utils.dart';
class HomeDashboard extends StatefulWidget {
final drawerItems = [
new DrawerItem("Dashboard"),
new DrawerItem("Program"),
new DrawerItem("Exibitors"),
new DrawerItem("Innovations"),
new DrawerItem("Attendees"),
new DrawerItem("Speed Session"),
new DrawerItem("Bookmarks"),
new DrawerItem("Announcements"),
new DrawerItem("Privacy Policy"),
new DrawerItem("Terms & Conditions"),
new DrawerItem("Logout")
];
@override
_HomeDashboardState createState() => _HomeDashboardState();
}
class _HomeDashboardState extends State<HomeDashboard> {
int _selectedDrawerIndex = 0;
//Let's use a switch statement to return the Fragment for a selected item
_getDrawerFragment(int pos) {
switch (pos) {
case 0:
return new HomeScreen();
case 1:
return new ProgramScreen();
case 2:
return new ExibitorsScreen();
case 3:
return new InnovationsScreen();
case 4:
return new AttendeesScreen();
case 5:
return new SpeedSessionScreen();
case 6:
return new BookmarksScreen();
case 7:
return new AnnouncementsScreen();
case 8:
return new PrivacyPolicyScreen();
case 9:
return new TermsConditionsScreen();
default:
return new Text("Error");
}
}
//Let's update the selectedDrawerItemIndex the close the drawer
_onSelectItem(int index) {
setState(() => _selectedDrawerIndex = index);
//we close the drawer
Navigator.of(context).pop();
}
@override
Widget build(BuildContext context) {
List<Widget> drawerOptions = [];
//Let's create drawer list items. Each will have an icon and text
for (var i = 0; i < widget.drawerItems.length; i++) {
var d = widget.drawerItems[i];
drawerOptions.add(
ListTile(
title: new Text(d.title),
selected: i == _selectedDrawerIndex,
onTap: () => _onSelectItem(i),
)
);
}
//Let's scaffold our homepage
return new Scaffold(
appBar: new AppBar(
// We will dynamically display title of selected page
title: new Text(widget.drawerItems[_selectedDrawerIndex].title),
actions: <Widget>[
IconButton(
tooltip: 'Search',
icon: const Icon(Icons.search),
onPressed: (){
},
),
IconButton(
tooltip: 'Search',
icon: const Icon(Icons.filter_list),
onPressed: (){
},
)
],
),
// Let's register our Drawer to the Scaffold
drawer: SafeArea(
child: new Drawer(
child: new Column(
children: <Widget>[
Container(
color: Utils.hexToColor("#F24A1C"),
height: MediaQuery.of(context).size.height / 10,
width: MediaQuery.of(context).size.width,
child: Padding(
padding: EdgeInsets.only(left: 20),
child: Align(
alignment: Alignment.centerLeft,
child: Text('Menu', style: TextStyle(
fontSize: 18,
color: Colors.white
))
),
),
),
new Column(children: drawerOptions)
],
),
),
),
body: _getDrawerFragment(_selectedDrawerIndex),
);
}
}
//Let's define a DrawerItem data object
class DrawerItem {
String title;
IconData icon;
DrawerItem(this.title);
}
在NavigationDrawer Screen中，应启用对搜索图标TextField的单击，而在List Screen中，当用户开始键入内容时应进行过滤。
列表屏幕
import 'dart:math';
import 'package:connectivity/connectivity.dart';
import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:innovation_bridge/detailScreens/ProgramDetailScreen.dart';
import 'package:innovation_bridge/dialogs/CommonMessageDialog.dart';
import 'package:innovation_bridge/utils/Utils.dart';
import 'package:table_calendar/table_calendar.dart';
class ProgramScreen extends StatefulWidget {
@override
_ProgramScreenState createState() => _ProgramScreenState();
}
class _ProgramScreenState extends State<ProgramScreen> {
var meteors = [
"Tunguska",
"Crab Pulsar",
"Geminga",
"Calvera",
"Vela X-1",
];
final String uri = 'https://jsonplaceholder.typicode.com/users';
Future<List<Users>> _fetchUsers() async {
print('@@ inside fetch user == ');
var response = await http.get(Uri.encodeFull(uri));
if (response.statusCode == 200) {
final items = json.decode(response.body).cast<Map<String, dynamic>>();
List<Users> listOfUsers = items.map<Users>((json) {
return Users.fromJson(json);
}).toList();
return listOfUsers;
} else {
throw Exception('Failed to load internet');
}
}
CalendarController _calendarController;
@override
void initState() {
super.initState();
_calendarController = CalendarController();
}
@override
void dispose() {
_calendarController.dispose();
super.dispose();
}
void _onDaySelected(DateTime day, List events) {
print('@@ CALLBACK: _onDaySelected' +day.toIso8601String());
setState(() {
});
}
void _onVisibleDaysChanged(DateTime first, DateTime last, CalendarFormat format) {
print('CALLBACK: _onVisibleDaysChanged');
}
@override
Widget build(BuildContext context) {
return Container(
child: Column(
children: <Widget>[
Container(
color: Colors.grey[350],
child: _buildTableCalendar(),
),
Expanded(
child: StreamBuilder(
stream: Connectivity().onConnectivityChanged,
builder: (BuildContext context, AsyncSnapshot<ConnectivityResult> snapShot){
if (!snapShot.hasData) return Center(child: CircularProgressIndicator());
var result = snapShot.data;
switch (result) {
case ConnectivityResult.none:
print("no net");
return Center(child: Text("No Internet Connection! none "));
case ConnectivityResult.mobile:
return _listDetials();
case ConnectivityResult.wifi:
print("yes net");
return _listDetials();
default:
return Center(child: Text("No Internet Connection! default"));
}
},
),
)
],
),
);
}
FutureBuilder _listDetials(){
return FutureBuilder(
future: _fetchUsers(),
builder: (context, snapshot){
if (!snapshot.hasData) {
return Center(child: CircularProgressIndicator());
}
if (snapshot.hasError){
return Text('${snapshot.error}');
}
else{
return ListView.builder(
itemCount: 5,
scrollDirection: Axis.vertical,
itemBuilder: (BuildContext context, int index){
return Padding(
padding: EdgeInsets.fromLTRB(15.0, 10.0, 15.0, 4),
child: Container(
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
GestureDetector(
onTap: (){
Navigator.push(context, MaterialPageRoute(
builder: (context) => ProgramDetailScreen()
));
},
child: Text('Program Activity Title', style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.w400
)),
),
Padding(padding: EdgeInsets.only(top: 6)),
Row(
children: <Widget>[
Expanded(
flex: 2,
child: Text('Location Name', style: TextStyle(
fontSize: 12,
fontWeight: FontWeight.w500,
color: Colors.blueAccent,
)),
),
Expanded(
flex: 2,
child: Align(
alignment: Alignment.centerRight,
child: Text('Start time - End time', style: TextStyle(
fontSize: 12,
fontWeight: FontWeight.w500,
color: Colors.blueAccent,
))
),
)
],
),
Padding(padding: EdgeInsets.only(top: 6)),
Text('Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.',
style: TextStyle(
fontSize: 12,
fontWeight: FontWeight.w400,
),),
ExpansionTile(
title: Text(''),
trailing: Icon(
Icons.face,
size: 36.0,
),
children: <Widget>[
GridView.count(
shrinkWrap: true,
physics: ClampingScrollPhysics(),
crossAxisCount: 3,
crossAxisSpacing: 5.0,
mainAxisSpacing: 5,
childAspectRatio: MediaQuery.of(context).size.width /
(MediaQuery.of(context).size.height / 4),
children: <Widget>[
GestureDetector(
onTap: (){
},
child: Container(
decoration: BoxDecoration(
border: Border.all(
width: 0.9
),
borderRadius: BorderRadius.all(
Radius.circular(5.0) // <--- border radius here
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(6, 5, 0, 0),
child: Text('Session Title',
softWrap: true,
overflow: TextOverflow.ellipsis,
style: TextStyle(
fontSize: 10,
fontWeight: FontWeight.bold
)),
),
Padding(
padding: EdgeInsets.fromLTRB(6, 1, 0, 0),
child: Text('10:00 - 10:30',
softWrap: true,
overflow: TextOverflow.ellipsis,
style: TextStyle(
fontSize: 9
)),
),
Padding(
padding: EdgeInsets.fromLTRB(6, 1, 0, 0),
child: Text('Hall B',
softWrap: true,
overflow: TextOverflow.ellipsis,
style: TextStyle(
fontSize: 9
)),
),
],
),
),
)
]),
],
// onExpansionChanged: (bool expanding) => setState(() => this.isExpanded = expanding),
)
],
),
),
);
},
);
}
},
);
}
// Simple TableCalendar configuration (using Styles)
Widget _buildTableCalendar() {
return TableCalendar(
calendarController: _calendarController,
startingDayOfWeek: StartingDayOfWeek.monday,
headerVisible: true,
initialCalendarFormat: CalendarFormat.week, availableCalendarFormats: const { CalendarFormat.week: 'Week', },
calendarStyle: CalendarStyle(
selectedColor: Colors.deepOrange[400],
todayColor: Colors.deepOrange[200],
markersColor: Colors.brown[700],
outsideDaysVisible: true
),
headerStyle: HeaderStyle(
formatButtonTextStyle: TextStyle().copyWith(color: Colors.white, fontSize: 15.0),
formatButtonDecoration: BoxDecoration(
color: Colors.deepOrange[400],
borderRadius: BorderRadius.circular(10.0),
),
),
onDaySelected: _onDaySelected,
onVisibleDaysChanged: _onVisibleDaysChanged,
);
}
}
Widget createGridView(BuildContext context, List<String> cosmicBodies) {
//I will shuffle my data
cosmicBodies.shuffle();
// Then build my GridView and return it
return new GridView.builder(
itemCount: cosmicBodies.length,
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3, mainAxisSpacing: 15.0),
itemBuilder: (BuildContext context, int index) {
return new GestureDetector(
child: new Card(
elevation: 5.0,
child: new Container(
alignment: Alignment.centerLeft,
margin: new EdgeInsets.only(top: 10.0, bottom: 10.0, left: 10.0),
child: new Text(cosmicBodies[index]),
),
),
);
});
}
class Users {
int id;
String name;
String username;
String email;
Users({
this.id,
this.name,
this.username,
this.email,
});
factory Users.fromJson(Map<String, dynamic> json) {
return Users(
id: json['id'],
name: json['name'],
email: json['email'],
username: json['username'],
);
}
}