我们可以在Flutter中创建一个新的小部件吗？

问题描述：

我是Flutter的新手，我注意到它提供了许多小部件供您选择。但是我的问题是：我们可以自己制造吗？例如，我可以制作自己尚未提供的按钮吗？

being new to Flutter i've noticed that it offers a lot of widgets to choose from. But my question is : Can we make our own? foe example, Can I make my own kind of button that's not already offered?

答

是的，您可以创建自己的小部件。例如，如上所述，您可以使用以下代码创建自定义按钮。

Yes you can create your own widget. For example, as you stated above, you can create a custom button using code like the one below.

OutlineButton 构造函数以红色背景色，32px的圆形边框半径和文本构建按钮。这也是其中的 onPressed 函数，当您按下按钮时会执行该函数；在下面的示例中，按下按钮后，您将打印到控制台的语句我按下了它。

The properties that you see inside the OutlineButton constructor build the button with a red background color, a circular border-radius of 32px and a text. The is also a onPressed function inside there that is executed when you press the button; in the example below after pressing the button you print to the console the statement I pressed it.

Widget _buildButton(BuildContext context){
    return OutlineButton(
      onPressed: (){
        print('I pressed it');
      },
      color: Colors.red,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(32.0)),
      child: Text('CUSTOM BUTTON'),
    );
  }

您还可以将按钮包装在 ButtonTheme 小部件，该小部件可为您提供多种功能，其中之一是根据需要的大小缩放按钮。

You can also wrap your button inside a ButtonTheme widget, which offers you multiple features, one of them is to scale the button with the sizes you need.

Widget _buildButton(BuildContext context){
    return ButtonTheme(
      height: 100,
      minWidth: 100,

      child: OutlineButton(
        onPressed: (){},
        color: Colors.red,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(32.0)),
        child: Text('CUSTOM BUTTON'),
      ),
    );
  }

我们可以在Flutter中创建一个新的小部件吗？

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