Trigger a function from a widget to a State object

Question

This is a simplified version of the scenario:

class ParentWdiegt extends StatelessWidget{
//
//
floatinActionButton: FloatingActionButtonWidget(onPressed:()=         


        

Answer 1

You can use GlobalKey for that:

// some global place
final customWidgetKey = new GlobalKey();

...

  // import the file with "customWidgetKey"

  new CustomWidget(key: customWidetKey, ...)

...

  // import the file with "customWidgetKey"

  floatinActionButton: FloatingActionButtonWidget(
      onPressed: ()=>customWidgetKey.currentState.someMethod(someValue))