带有图标和文字的 Flutter 按钮看起来很奇怪

Question

我正在尝试创建一个 Flutter 应用程序，它有一个带有文本和图标作为标签的按钮，该图标位于文本的右侧。 this post 中描述的方法产生一个看起来很奇怪的按钮，它似乎扩展到应用程序的宽度，请看这张图片(链接，因为我不允许附加图片):

Button becomes wide when adding a Row widget as child

我不清楚使用哪些布局小部件来调整文本+图像按钮以将其格式化为纯文本按钮。

产生上述例子的代码:

Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new Text(
              'You have pushed the button this many times:',
            ),
            new Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
            new RaisedButton(
              onPressed: _incrementCounter,
              child: new Row(
                children: <Widget>[
                  new Text("Button with text and icon!"),
                  new Icon(Icons.lightbulb_outline)
                ],
              ),
            ),
            new RaisedButton(
              onPressed: _incrementCounter,
              child: new Text("Button with only text")
              ),
          ],
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: new Icon(Icons.add),
      ),
    );
  }
}

Answer 1

行属性 mainAxisSize: MainAxisSize.min 在这里发挥作用。

@override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Home'),
      ),
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new RaisedButton(
              onPressed: () {},
              child: new Row(
                mainAxisAlignment: MainAxisAlignment.center,
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                  new Text('Button with text and icon!'),
                  new Icon(Icons.lightbulb_outline),
                ],
              ),
            ),
            new RaisedButton(
              onPressed: () {},
              child: new Text('Button with only text'),
            )
          ],
        ),
      ),
    );
  }