Flutter:继承自抽象的无状态小部件 [英] Flutter: inherit from abstract stateless widget

问题描述

我有一个必须自定义小部件的类.这个可以有两个不同的实现，所以我想有一个抽象类作为接口，并创建另外两个扩展抽象类的类.所以，我有:

I have a class that has to take a custom widget. This one can have two different implementations, so I would like to have an abstract class as interface and create two other classes those extend the abstract one. So, I have:

abstract class ICustomWidget extends StatelessWidget{}

class A extends ICustomWidget{

  @override
  Widget build(BuildContext context) =>
     //Implementation
}

class B extends ICustomWidget {
  @override
  Widget build(BuildContext context) =>
     //Implementation
}

我想问一下这是否是正确的方法，或者还有另一种方法.谢谢

I want to ask if this is the right way to do this or there is another one. Thanks

推荐答案

我会使用 implements ，而不是 extends ，因为 ICustomWidget 是接口，而不是类，除非您可以提供更多的上下文和/或代码示例.

Rather than extends, I would use implements, because ICustomWidget is an interface, not a class, except if you can give more context and/or code sample.

这是界面的示例代码

abstract class ICustomWidget {
// or
// abstract class ICustomWidget extends StatelessWidget {
  void myProtocal();
}

class A extends StatelessWidget implements ICustomWidget {

  @override
  void myProtocal() {
    // TODO: implement myProtocal
  }

  @override
  Widget build(BuildContext context) {
     //Implementation
  }
}

class B extends ICustomWidget {
  // compilation error, `myProtocal` not implemented
  @override
  Widget build(BuildContext context) {
     //Implementation
  }
}

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