改进行的ListView的总体布局
我正在尝试像这样实现行的ListView：
这是我的代码：
import 'package:flutter/material.dart';
import 'package:good_driver_app/common/ExpandedButton.dart';
class ServicePetrolPage extends StatefulWidget {
// HomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
// final String title;
@override
_ServicePetrolPage createState() => _ServicePetrolPage();
}
class _ServicePetrolPage extends State<ServicePetrolPage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text('Petrol'),
),
body: Container(
child: ListView(
children: <Widget>[
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row (
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo",
),
),
Flexible(
child: new Text(
"Location",
),
),
Flexible(
child: new Text(
"Distance",
),
),
Flexible(
child: new Text(
"\$",
),
),
Flexible(
child: new Text(
"Facilities",
),
),
],
),
),
)
],
),
),
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row (
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 1",
),
),
Flexible(
child: new Text(
"Johnson Rd",
),
),
Flexible(
child: new Text(
"0.2 KM",
),
),
Flexible(
child: new Text(
"\$12.45",
),
),
Flexible(
child: new Text(
"ATM, Restaurant",
),
),
],
),
),
)
],
),
),
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row (
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 2",
),
),
Flexible(
child: new Text(
"Hennessy Rd",
),
),
Flexible(
child: new Text(
"0.5 KM",
),
),
Flexible(
child: new Text(
"\$12.88",
),
),
Flexible(
child: new Text(
"ATM",
),
),
],
),
),
)
],
),
),
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row (
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 3",
),
),
Flexible(
child: new Text(
"Lockhart Rd",
),
),
Flexible(
child: new Text(
"1.2 KM",
),
),
Flexible(
child: new Text(
"\$12.88",
),
),
Flexible(
child: new Text(
"Toilet",
),
),
],
),
),
)
],
),
),
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row (
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 4",
),
),
Flexible(
child: new Text(
"Canal Rd",
),
),
Flexible(
child: new Text(
"1.2 KM",
),
),
Flexible(
child: new Text(
"\$12.90",
),
),
Flexible(
child: new Text(
"Restaurant, Toilet",
),
),
],
),
),
)
],
),
),
],
),
),
);
}
}
这是结果：
我的问题是：
- 如何在单元格之间放置水平间隙？
- 如何缩小行间距？
2 个答案:
答案 0 :(得分：0)
1-添加一个Container并将height设置为1（您想要的颜色）（在每个容器行之间）。
Container(
height: 1,
color: Colors.black,
),
2-减少填充，我将将此padding: EdgeInsets.all(10)更改为此padding: EdgeInsets.symmetric(horizontal: 10, vertical: 2)
最终代码：
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text('Petrol'),
),
body: Container(
child: ListView(
children: <Widget>[
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo",
),
),
Flexible(
child: new Text(
"Location",
),
),
Flexible(
child: new Text(
"Distance",
),
),
Flexible(
child: new Text(
"\$",
),
),
Flexible(
child: new Text(
"Facilities",
),
),
],
),
),
)
],
),
),
Container(
height: 1,
color: Colors.black,
),
Container(
padding: EdgeInsets.all(10),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding:
EdgeInsets.symmetric(horizontal: 10, vertical: 2),
height: 50.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 1",
),
),
Flexible(
child: new Text(
"Johnson Rd",
),
),
Flexible(
child: new Text(
"0.2 KM",
),
),
Flexible(
child: new Text(
"\$12.45",
),
),
Flexible(
child: new Text(
"ATM, Restaurant",
),
),
],
),
),
)
],
),
),
Container(
height: 1,
color: Colors.black,
),
Container(
padding: EdgeInsets.symmetric(horizontal: 10, vertical: 2),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 2",
),
),
Flexible(
child: new Text(
"Hennessy Rd",
),
),
Flexible(
child: new Text(
"0.5 KM",
),
),
Flexible(
child: new Text(
"\$12.88",
),
),
Flexible(
child: new Text(
"ATM",
),
),
],
),
),
)
],
),
),
Container(
height: 1,
color: Colors.black,
),
Container(
padding: EdgeInsets.symmetric(horizontal: 10, vertical: 2),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 3",
),
),
Flexible(
child: new Text(
"Lockhart Rd",
),
),
Flexible(
child: new Text(
"1.2 KM",
),
),
Flexible(
child: new Text(
"\$12.88",
),
),
Flexible(
child: new Text(
"Toilet",
),
),
],
),
),
)
],
),
),
Container(
height: 1,
color: Colors.black,
),
Container(
padding: EdgeInsets.symmetric(horizontal: 10, vertical: 2),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(15.0),
height: 50.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: new Text(
"Logo 4",
),
),
Flexible(
child: new Text(
"Canal Rd",
),
),
Flexible(
child: new Text(
"1.2 KM",
),
),
Flexible(
child: new Text(
"\$12.90",
),
),
Flexible(
child: new Text(
"Restaurant, Toilet",
),
),
],
),
),
)
],
),
),
Container(
height: 1,
color: Colors.black,
),
],
),
),
);
}
答案 1 :(得分：0)
这就是我要做的。
ServicePetrolPage
int mergeSortInvCount(vector<int> &arr, int izq, int der);
int mergeInvCount(vector<int> &arr, int izq, int mitad, int der);
void invCountRecursivo(vector<int> &arr, int n){
int numInversiones = mergeSortInvCount(arr, 1, n);
cout << "Num inversiones:" << numInversiones << endl;
for(int i=0; i < n; i++){
cout<<arr[i]<<endl;
}
}
int mergeSortInvCount(vector<int> &arr, int izq, int der){
int invCount = 0;
if(izq < der){
int mitad = (izq + der)/2;
invCount = mergeSortInvCount(arr, izq, mitad);
invCount += mergeSortInvCount(arr, mitad+1, der);
invCount += mergeInvCount(arr, izq, mitad, der);
}
return invCount;
}
int infinito = numeric_limits<int>::max();
int mergeInvCount(vector<int> &arr, int izq, int mitad, int der){
int n1 = mitad - izq + 1;
int n2 = der - mitad;
int invCount = 0;
vector<int> vectorIzq;
vector<int> vectorDer;
for(int k=0;k<n1;k++){
vectorIzq.push_back(arr[izq+k-1]);
}
vectorIzq.push_back(infinito);
for(int k=0;k<n2;k++){
vectorDer.push_back(arr[mitad+k]);
}
vectorDer.push_back(infinito);
int i = 0;
int j = 0;
for(int k = izq; k <= der; k++){
if(vectorIzq[i] <= vectorDer[j]){
arr[k] = vectorIzq[i];
i++;
}
else{
arr[k] = vectorDer[j];
j++;
invCount += (mitad - i);
}
}
return invCount;
}
DataView
class ServicePetrolPage extends StatefulWidget {
@override
_ServicePetrolPage createState() => _ServicePetrolPage();
}
class _ServicePetrolPage extends State<ServicePetrolPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Petrol'),
),
body: Container(
child: ListView(
children: <Widget>[
DataView(
distance: 'Distance',
facilities: ['Facilities'],
location: 'Location',
logo: ' Logo ',
price: '',
),
DataView(
logo: 'Logo 1',
location: 'Johnson Rd',
distance: '0.2 KM',
facilities: ['ATM', 'Restaurant'],
price: '12.45',
),
DataView(
logo: 'Logo 2',
location: 'Hennessy Rd',
distance: '0.5 KM',
facilities: ['ATM'],
price: '12.88',
),
DataView(
logo: 'Logo 3',
location: 'Lockhart Rd',
distance: '1.5 KM',
facilities: ['Toilet'],
price: '12.88',
),
DataView(
logo: 'Logo 4',
location: 'Canal Rd',
distance: '1.2 KM',
facilities: ['Restaurant', 'Toilet'],
price: '12.90',
),
],
),
),
);
}
}
由于我使用的是列表展开语法，因此您必须更新自己的 pubspec.yaml中的SDK约束
pubspec.yaml
class DataView extends StatelessWidget { final String logo; final String location; final String distance; final String price; final List<String> facilities; DataView({ this.location, this.distance, this.facilities, this.logo, this.price, }); @override Widget build(BuildContext context) { return Container( padding: EdgeInsets.all(10), child: Row( mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ Text("$logo"), Expanded( flex: 2, child: Center(child: Text("$location")), ), Expanded( flex: 1, child: Center(child: Text("$distance")), ), Expanded( flex: 1, child: Center(child: Text("\$$price")), ), Expanded( flex: 1, child: Wrap( alignment: WrapAlignment.center, children: <Widget>[ if (facilities != null) ...facilities.map((facility) { return Padding( padding: const EdgeInsets.all(0.0), child: Text( '$facility ', overflow: TextOverflow.ellipsis, ), ); }).toList(), ], ), ), ], ), ); } }
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