Flutter - 在列表生成器中列出
Flutter - list inside a list builder
我对 flutter 没有多少经验。
我想将 language_tool library 用于 Dart 和 Flutter。
我创建了以下脚本：
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Chat(),
);
}
}
class Chat extends StatefulWidget {
const Chat({Key? key}) : super(key: key);
@override
_ChatState createState() => _ChatState();
}
class _ChatState extends State<Chat> {
String text = 'Henlo i am Gabriele';
Future<List<WritingMistake>> tool(String text) async {
var tool = LanguageTool();
var result = tool.check(text);
var correction = await result;
print(correction);
List<WritingMistake> mistakes = [];
for (var m in correction) {
//var mistake = m.issueDescription;
WritingMistake mistake = WritingMistake(
message: m.message,
offset: m.offset,
length: m.length,
issueType: m.issueType,
issueDescription: m.issueDescription,
replacements: m.replacements,
);
mistakes.add(mistake);
}
print(mistakes.length);
print(mistakes);
return mistakes;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
color: Colors.red,
height: 150.0,
width: double.infinity,
child:
Center(child: Text(text, style: TextStyle(fontSize: 20.0))),
),
Text(
'\n Tap on the blue button to replace it in the message.\n',
),
FutureBuilder(
future: tool(text),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.data == null) {
return Container(
child: Center(
child: Text('Loading...'),
),
);
} else {
return SizedBox(
height: 200.0,
child: ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int index) {
return Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Row(
children: [
Row(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(' ' +
(index + 1).toString() +
' '),
Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(text.substring(
snapshot.data[index].offset,
snapshot.data[index].offset +
snapshot
.data[index].length)),
),
color: Colors.blue,
),
],
),
Icon(
Icons.arrow_forward,
),
Text(snapshot.data[index].issueDescription)
],
),
// Todo: Row with List of .replacements
],
),
),
// snapshot.data[index].issueDescription),
);
},
),
);
}
},
),
Expanded(child: Container(color: Colors.grey))
],
),
),
);
}
}
目前看起来像这样：
我希望它变成这个屏幕中的样子，但我希望绿色容器源自 WritingMistake.replacements 列表（列表中的每个元素都是文本）：
你知道我该怎么做吗？
花了几个小时做你想做的事。我的代码：
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:language_tool/language_tool.dart';
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Chat(),
);
}
}
class Chat extends StatefulWidget {
const Chat({Key? key}) : super(key: key);
@override
_ChatState createState() => _ChatState();
}
class _ChatState extends State<Chat> {
String text = 'Henlo i am Gabriele';
static List<WritingMistake> mistakes = []; // Moved Here And Init Like Static
Future<List<WritingMistake>> tool(String text) async {
var tool = LanguageTool();
var result = tool.check(text);
var correction = await result;
print(correction);
for (var m in correction) {
//var mistake = m.issueDescription;
WritingMistake mistake = WritingMistake(
message: m.message,
offset: m.offset,
length: m.length,
issueType: m.issueType,
issueDescription: m.issueDescription,
replacements: m.replacements,
);
mistakes.add(mistake);
}
print(mistakes.length);
print(mistakes);
return mistakes;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
color: Colors.red,
height: 150.0,
width: double.infinity,
child: Center(
child: Text(text, style: const TextStyle(fontSize: 20.0))),
),
const Text(
'\n Tap on the blue button to replace it in the message.\n',
),
FutureBuilder(
future: tool(text),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.data == null) {
return const Center(
child: Text('Loading...'),
);
} else {
return SizedBox(
height: 200.0,
child: ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int mistakeIdIndex) {
return Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Row(
children: [
Row(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(' ' +
(mistakeIdIndex + 1).toString() +
' '),
Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(text.substring(
snapshot.data[mistakeIdIndex]
.offset,
snapshot.data[mistakeIdIndex]
.offset +
snapshot
.data[mistakeIdIndex]
.length)),
),
color: Colors.blue,
),
],
),
const Icon(
Icons.arrow_forward,
),
Text(snapshot
.data[mistakeIdIndex].issueDescription)
],
),
// Todo: Row with List of .replacements
SizedBox(
width: MediaQuery.of(context)
.size
.width, // Width = Screen Width
height: 44,
child: ListView.builder(
itemCount: mistakes.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (BuildContext context,
int replacementsListIndex) {
return buildReplacements(mistakeIdIndex,
replacementsListIndex);
}),
)
],
),
),
// snapshot.data[index].issueDescription),
);
},
),
);
}
},
),
Expanded(child: Container(color: Colors.grey))
],
),
),
);
}
Widget buildReplacements(int mistakeIdIndex, int replacementsListIndex) {
if (mistakes[replacementsListIndex].replacements!.length == null) {
return const SizedBox(); // Return Empty If No Replacements Found, Just To Be Safe
}
// Check For Mistake ID - Remove This Will Cause A Problem with Displaying All Replacements Under All Words
if (mistakeIdIndex == replacementsListIndex) {
// If Only 1 Replacement, No Need To Create ListView.builder
if (mistakes[replacementsListIndex].replacements!.length == 1) {
return Container(
margin: const EdgeInsets.all(4),
padding: const EdgeInsets.all(8),
decoration: const BoxDecoration(
color: Color.fromARGB(255, 174, 213, 130)), // Green Color
child: Text(
mistakes[replacementsListIndex].replacements!.toString(),
style: const TextStyle(),
textAlign: TextAlign.center,
),
);
}
// Create ListView.builder to Create A Split Between Replacements To One Wrong-Word (Every Replacement Has It's Own Container With Green Background)
else {
return ListView.builder(
itemCount: mistakes[replacementsListIndex].replacements!.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (context, index) {
return Container(
margin: const EdgeInsets.all(4),
padding: const EdgeInsets.all(8),
decoration: const BoxDecoration(
color: Color.fromARGB(255, 174, 213, 130)), // Green Color
child: Text(
mistakes[replacementsListIndex]
.replacements![index]!
.toString(),
style: const TextStyle(),
textAlign: TextAlign.center,
),
);
});
}
}
// If Replacement Not For This Wrong-Word, Then Skip
else {
return const SizedBox();
}
}
}
和截图：
我对 flutter 没有多少经验。
我想将 language_tool library 用于 Dart 和 Flutter。
我创建了以下脚本：
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Chat(),
);
}
}
class Chat extends StatefulWidget {
const Chat({Key? key}) : super(key: key);
@override
_ChatState createState() => _ChatState();
}
class _ChatState extends State<Chat> {
String text = 'Henlo i am Gabriele';
Future<List<WritingMistake>> tool(String text) async {
var tool = LanguageTool();
var result = tool.check(text);
var correction = await result;
print(correction);
List<WritingMistake> mistakes = [];
for (var m in correction) {
//var mistake = m.issueDescription;
WritingMistake mistake = WritingMistake(
message: m.message,
offset: m.offset,
length: m.length,
issueType: m.issueType,
issueDescription: m.issueDescription,
replacements: m.replacements,
);
mistakes.add(mistake);
}
print(mistakes.length);
print(mistakes);
return mistakes;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
color: Colors.red,
height: 150.0,
width: double.infinity,
child:
Center(child: Text(text, style: TextStyle(fontSize: 20.0))),
),
Text(
'\n Tap on the blue button to replace it in the message.\n',
),
FutureBuilder(
future: tool(text),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.data == null) {
return Container(
child: Center(
child: Text('Loading...'),
),
);
} else {
return SizedBox(
height: 200.0,
child: ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int index) {
return Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Row(
children: [
Row(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(' ' +
(index + 1).toString() +
' '),
Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(text.substring(
snapshot.data[index].offset,
snapshot.data[index].offset +
snapshot
.data[index].length)),
),
color: Colors.blue,
),
],
),
Icon(
Icons.arrow_forward,
),
Text(snapshot.data[index].issueDescription)
],
),
// Todo: Row with List of .replacements
],
),
),
// snapshot.data[index].issueDescription),
);
},
),
);
}
},
),
Expanded(child: Container(color: Colors.grey))
],
),
),
);
}
}
目前看起来像这样：
我希望它变成这个屏幕中的样子，但我希望绿色容器源自 WritingMistake.replacements 列表（列表中的每个元素都是文本）：
你知道我该怎么做吗？
花了几个小时做你想做的事。我的代码：
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:language_tool/language_tool.dart';
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Chat(),
);
}
}
class Chat extends StatefulWidget {
const Chat({Key? key}) : super(key: key);
@override
_ChatState createState() => _ChatState();
}
class _ChatState extends State<Chat> {
String text = 'Henlo i am Gabriele';
static List<WritingMistake> mistakes = []; // Moved Here And Init Like Static
Future<List<WritingMistake>> tool(String text) async {
var tool = LanguageTool();
var result = tool.check(text);
var correction = await result;
print(correction);
for (var m in correction) {
//var mistake = m.issueDescription;
WritingMistake mistake = WritingMistake(
message: m.message,
offset: m.offset,
length: m.length,
issueType: m.issueType,
issueDescription: m.issueDescription,
replacements: m.replacements,
);
mistakes.add(mistake);
}
print(mistakes.length);
print(mistakes);
return mistakes;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
color: Colors.red,
height: 150.0,
width: double.infinity,
child: Center(
child: Text(text, style: const TextStyle(fontSize: 20.0))),
),
const Text(
'\n Tap on the blue button to replace it in the message.\n',
),
FutureBuilder(
future: tool(text),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.data == null) {
return const Center(
child: Text('Loading...'),
);
} else {
return SizedBox(
height: 200.0,
child: ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int mistakeIdIndex) {
return Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Row(
children: [
Row(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(' ' +
(mistakeIdIndex + 1).toString() +
' '),
Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(text.substring(
snapshot.data[mistakeIdIndex]
.offset,
snapshot.data[mistakeIdIndex]
.offset +
snapshot
.data[mistakeIdIndex]
.length)),
),
color: Colors.blue,
),
],
),
const Icon(
Icons.arrow_forward,
),
Text(snapshot
.data[mistakeIdIndex].issueDescription)
],
),
// Todo: Row with List of .replacements
SizedBox(
width: MediaQuery.of(context)
.size
.width, // Width = Screen Width
height: 44,
child: ListView.builder(
itemCount: mistakes.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (BuildContext context,
int replacementsListIndex) {
return buildReplacements(mistakeIdIndex,
replacementsListIndex);
}),
)
],
),
),
// snapshot.data[index].issueDescription),
);
},
),
);
}
},
),
Expanded(child: Container(color: Colors.grey))
],
),
),
);
}
Widget buildReplacements(int mistakeIdIndex, int replacementsListIndex) {
if (mistakes[replacementsListIndex].replacements!.length == null) {
return const SizedBox(); // Return Empty If No Replacements Found, Just To Be Safe
}
// Check For Mistake ID - Remove This Will Cause A Problem with Displaying All Replacements Under All Words
if (mistakeIdIndex == replacementsListIndex) {
// If Only 1 Replacement, No Need To Create ListView.builder
if (mistakes[replacementsListIndex].replacements!.length == 1) {
return Container(
margin: const EdgeInsets.all(4),
padding: const EdgeInsets.all(8),
decoration: const BoxDecoration(
color: Color.fromARGB(255, 174, 213, 130)), // Green Color
child: Text(
mistakes[replacementsListIndex].replacements!.toString(),
style: const TextStyle(),
textAlign: TextAlign.center,
),
);
}
// Create ListView.builder to Create A Split Between Replacements To One Wrong-Word (Every Replacement Has It's Own Container With Green Background)
else {
return ListView.builder(
itemCount: mistakes[replacementsListIndex].replacements!.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (context, index) {
return Container(
margin: const EdgeInsets.all(4),
padding: const EdgeInsets.all(8),
decoration: const BoxDecoration(
color: Color.fromARGB(255, 174, 213, 130)), // Green Color
child: Text(
mistakes[replacementsListIndex]
.replacements![index]!
.toString(),
style: const TextStyle(),
textAlign: TextAlign.center,
),
);
});
}
}
// If Replacement Not For This Wrong-Word, Then Skip
else {
return const SizedBox();
}
}
}
和截图：