问题描述
谁知道 Flutter 中的 PaginatedDataTable 类？我今天发现了它，我想知道它是否不能解决我的问题。我有来自 API REST (PHP/MysqL) 的数据，我想在包含多个页面的表中加载数据。我更喜欢不要一次性加载所有数据，因为它可能很大，因此会减慢移动应用程序的速度。所以我们的想法是一次只加载 10 行，所以如果用户想看到更多，他可以点击下一页查看下一页等数据。
现在，我的代码是： 如您所见，我使用 futurebuilder 并将我想要的结果数量按页面 (20) 发送到我的 api，我的 api 返回前 20 个结果
import 'package:Flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'dart:async';
import 'menu_member.dart';
import 'globals.dart' as globals;
import 'appbar_draw.dart';
import 'package:font_awesome_Flutter/font_awesome_Flutter.dart';
import 'package:intl/intl.dart';
// Create a Form widget.
class Affiche_Jetons extends StatefulWidget {
@override
_Affiche_Jetons_State createState() {
return _Affiche_Jetons_State();
}
}
// Create a corresponding State class.
// This class holds data related to the form.
class _Affiche_Jetons_State extends State<Affiche_Jetons> {
@override
Future<List<ligne_jeton>> solde;
num total;
num resultbypage=20;
num nbpages=0;
num pageactuelle=1;
num premiereEntree=0;
Future <List<ligne_jeton>> Liste_Solde_display(num pageact) async {
// SERVER LOGIN API URL
var url = 'https://www.fortune-island.com/app/detail_credits.PHP';
premiereEntree=(pageact-1)*resultbypage;
var data = {
'id_membre': globals.id_membre,'premiere': premiereEntree,'resultbypage': resultbypage,};
var data_encode = jsonEncode(data);
print('appel http');
print(data_encode);
// Starting Web API Call.
var response = await http.post(url,body: data_encode,headers: {'content-type': 'application/json','accept': 'application/json','authorization': globals.token});
// Getting Server response into variable.
print(json.decode(response.body));
var jsondata = json.decode(response.body);
pageactuelle=pageact+1;
globals.gems=num.parse(jsondata['gems']);
globals.credits=num.parse(jsondata['credits']);
total=num.parse(jsondata['total']);
nbpages=(total/resultbypage).ceil();
List<ligne_jeton> lines = [];
var i=0;
if (jsondata.containsKey('listec')) {
for (var u in jsondata['listec']) {
i = i + 1;
ligne_jeton line = ligne_jeton(
u["dates"],u["heure"],u["credits"],u["type"]);
lines.add(line);
}
}
return lines;
}
void initState() {
solde = Liste_Solde_display(pageactuelle);
super.initState();
}
@override
Widget build(BuildContext context) {
return Stack(
children: <Widget>[
Container(
decoration: Boxdecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,end: Alignment.bottomright,colors: <Color>[
Colors.blue[300],Colors.blue[400]
],),Scaffold(
appBar: drawappbar(true),backgroundColor: Colors.transparent,drawer: new DrawerOnly(className: Affiche_Jetons()),body:
Container(
height: MediaQuery
.of(context)
.size
.height,width: MediaQuery
.of(context)
.size
.width,child:
FutureBuilder(
future: solde,builder: (BuildContext context,AsyncSnapshot snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return new Center(
child: new CircularProgressIndicator(),);
default:
if (snapshot.hasError) {
return new Center(
child: new Text('Error: ${snapshot.error}'),);
}
else {
List<ligne_jeton> values = snapshot.data;
if (values.isEmpty) {
return Container(
child: Center(
child: Text("Aucun mouvement de jetons pour le moment !!!",style: TextStyle(color: Colors.white))
)
);
}
else {
return ListView(
children: <Widget>[
Center(
child: Container(
margin: const EdgeInsets.only(top: 20.0),child: Text("DETAIL DE VOS JetoNS",textAlign: TextAlign.center,style: TextStyle(fontSize: 30.0,color: Colors.white))
),DataTable(
columnSpacing: 0,daTarowHeight: 50,columns: [
DataColumn(
label: Text("DATE",style: TextStyle(color: Colors.white)),numeric: false,tooltip: "",DataColumn(
label: Text("JetoNS",DataColumn(
label: Text("TYPE",],rows: List.generate(values.length,(index) {
var parsedDate = DateTime.parse(values[index].date);
final formatter = new DateFormat('dd/MM/yyyy HH:mm');
var dat = formatter.format(parsedDate);
return DaTarow(
cells: [
DataCell(
Text(dat,style: TextStyle(fontSize: 12.0,fontWeight: FontWeight.w900,color:Colors.white)),DataCell(
RichText(
text: TextSpan(
children: [
TextSpan(
text: values[index].nb_jeton.toString()+" ",style: TextStyle(fontSize: 12,fontWeight: FontWeight.w800,color: Colors.white)
),WidgetSpan(
child: Icon(FontAwesomeIcons.coins,color: Colors.Amber[200],size:15)
),)
),DataCell(
Text(values[index].type.toString(),color: Colors.white)),]
);
}).toList(),);
}
}
}
}
)
)
)
]
);
}
}
class ligne_jeton {
final String date;
final String heure;
final String nb_jeton;
final String type;
const ligne_jeton (this.date,this.heure,this.nb_jeton,this.type);
}
解决方法
要实现无限滚动，我们需要一个scrollcntroller，目前future builder不支持controller，所以尝试使用listview builder而不是future builder，或者你可以使用flutter_pagewise插件来实现分页