Question

如何重用InlineSpan类型的代码段（例如TextSpan，WidgetSpan）。

例如，

Text.rich(
  TextSpan(
    children: [
      WidgetSpan(...), // code I like to reuse
      ... // other stuff
    ],
  ),
)

我当然可以编写一个函数，给我这个InlineSpan，就像这样：

InlineSpan myCustomWidgetSpan() {
  return WidgetSpan(...);
}

从技术上讲这是可以的，但是通常我会通过创建扩展其他Flutter类的类（例如StatelessWidget或StatefulWidget）来重用部分代码。

我认为应该对此采取一些更惯用的方法。那么，重用产生InlineSpan的代码的最佳实践是什么？

Answer 1

您可以在下面复制粘贴运行完整代码
您可以使用软件包https://pub.dev/packages/span_builder

代码段

final spans = SpanBuilder("The quick brown fox")
      .apply(TextSpan(text: "brown", style: TextStyle(fontWeight: FontWeight.bold)))
      .apply(TextSpan(text: "?"), whereText: "fox")
      .build();


Text.rich(
              TextSpan(
                children: spans
              ),
            ),

工作演示

完整代码

import 'package:flutter/material.dart';
import 'package:span_builder/span_builder.dart';

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

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

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  final spans = SpanBuilder("The quick brown fox")
      .apply(TextSpan(text: "brown", style: TextStyle(fontWeight: FontWeight.bold)))
      .apply(TextSpan(text: "?"), whereText: "fox")
      .build();

  void _incrementCounter() {
    setState(() {     
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {    
    return Scaffold(
      appBar: AppBar(        
        title: Text(widget.title),
      ),
      body: Center(        
        child: Column(         
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text.rich(
              TextSpan(
                children: spans
              ),
            ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), 
    );
  }
}

如何在Flutter中创建自定义InlineSpans？

1 个答案: