Subclass a class that extends StatelessWidget or StatefulWidget class

Question

Is it possible to create a class that extends a class extending StatelessWidget or StatefulWidget.

For example:

class MyButton extends StatelessWidget { final String label; Button({this.label}); @override Widget build(BuildContext context) {     return ButtonExample("label");} } 

then

class SubmitButton extends MyButton {    String label;    SubmitButton({Key key, this.label}) : super(label: label);  // then somehow extend the parent build and change only the color // or in case of StatefulWidget change a functionality } 

I tried to search for examples online but I had not success.

Answer 1

In Flutter composition is preferred over inheritance.
Widgets are not supposed to be extended, this is why there are no examples or tutorials how to do it.

Flutter has a strong focus on composition and the included widget library contains a lot of smaller widgets that do one thing well, that allow to compose them into custom widgets in many different ways.