Flutter 如何在展开的颤振列表中指定图元的宽度？

下面的代码表示一个项目列表，其中列表应为全宽，但列表中的元素可能不全宽。颤振似乎忽略了我对

SizedBox

的宽度限制，并迫使它完全展开

class ExampleBadListWidth extends StatelessWidget {
  List<String> things = [
    "1: This is a really really really really really really really  really really really  long thing",
    "2: This is a really really really really really really really  really really really  long thing",
    "3: This is a really really really really really really really  really really really  long thing"
  ];

  ExampleBadListWidth();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(children: [
      Expanded(
          child: ListView.builder(
        itemCount: things.length,
        itemBuilder: _thingBuilder,
      ))
    ]));
  }

  Widget _thingBuilder(context, index) {
    return SizedBox(width: 100, child: Text(things[index]));
  }
}

类示例BadListWidth扩展无状态小部件{
列出事情=[
“1:这真是一件很长的事情”，
“2:这真是一件很长的事情”，
“3:这真是一件很长的事”
];
示例BadListWidth（）；
@凌驾
小部件构建（构建上下文）{
返回脚手架(
正文：列（子项：[
扩大(
子项：ListView.builder(
itemCount:things.length，
itemBuilder:_thingBuilder，
))
]));
}
小部件_thingBuilder（上下文、索引）{
return-SizedBox（宽度：100，子项：Text（things[index]））；
}
}

您可以复制粘贴运行下面的完整代码
您可以使用

Center

或

Align

代码片段

Widget _thingBuilder(context, index) {
    return Center(
      child: SizedBox(
          width: 100,
          child: Text(things[index])),
    );
  }

或

工作演示

完整代码

import 'package:flutter/material.dart';

class ExampleBadListWidth extends StatelessWidget {
  List<String> things = [
    "1: This is a really really really really really really really  really really really  long thing",
    "2: This is a really really really really really really really  really really really  long thing",
    "3: This is a really really really really really really really  really really really  long thing"
  ];

  ExampleBadListWidth();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(children: [
      Expanded(
          child: ListView.builder(
        itemCount: things.length,
        itemBuilder: _thingBuilder,
      ))
    ]));
  }

  Widget _thingBuilder(context, index) {
    return Align(
      alignment: Alignment.centerLeft,
      child: SizedBox(
          width: 100,
          child: Text(things[index])),
    );
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: ExampleBadListWidth(),
    );
  }
}

导入“包装：颤振/材料.省道”；
类ExampleBadListWidth扩展了无状态小部件{
列出事情=[
“1:这真是一件很长的事情”，
“2:这真是一件很长的事情”，
“3:这真是一件很长的事”
];
示例BadListWidth（）；
@凌驾
小部件构建（构建上下文）{
返回脚手架(
正文：列（子项：[
扩大(
子项：ListView.builder(
itemCount:things.length，
itemBuilder:_thingBuilder，
))
]));
}
小部件_thingBuilder（上下文、索引）{
返回对齐(
对齐：alignment.centerLeft，
孩子：大小盒子(
宽度：100，
子：文本（事物[索引]），
);
}
}
void main（）{
runApp（MyApp（））；
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建（构建上下文）{
返回材料PP(
标题：“颤振演示”，
主题：主题数据(
主样本：颜色。蓝色，
视觉密度：视觉密度。自适应平台密度，
),
主页：示例BadListWidth（），
);
}
}

import 'package:flutter/material.dart';

class ExampleBadListWidth extends StatelessWidget {
  List<String> things = [
    "1: This is a really really really really really really really  really really really  long thing",
    "2: This is a really really really really really really really  really really really  long thing",
    "3: This is a really really really really really really really  really really really  long thing"
  ];

  ExampleBadListWidth();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(children: [
      Expanded(
          child: ListView.builder(
        itemCount: things.length,
        itemBuilder: _thingBuilder,
      ))
    ]));
  }

  Widget _thingBuilder(context, index) {
    return Align(
      alignment: Alignment.centerLeft,
      child: SizedBox(
          width: 100,
          child: Text(things[index])),
    );
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: ExampleBadListWidth(),
    );
  }
}