CODEWITHSUNDEEP
inheritanceflutterwidgetabstract-class
Little Monkey
Little Monkey

Reputation: 6157

Flutter: inherit from abstract stateless widget

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
}

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

Upvotes: 10

Views: 7882

Answers (2)

Вова Заика
Вова Заика

Reputation: 1

I would recommend to do next

abstract class ICustomWidget implements Widget {
void myProtocol();

}

and rest is like previous commentator. The reason why is that you can use you interface directly in some other build method without casting it to exact type because it is already inherits Widget

Upvotes: 0

TruongSinh
TruongSinh

Reputation: 4866

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.

Here's the sample code for interface


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
  }
}

Upvotes: 14

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