如何将 function 传递给较低的小部件

Question

child: DismissiblePage(
        direction: DismissDirection.down,
        onDismiss: () => Navigator.of(context).pop(),
        child: InstagramStorySwipe(
          initialPage: index,
          children: List.generate(
            snapshot.data?.data?.data?.user?.feedReelsTray
                ?.edgeReelsTrayToReel?.edges?.length,
            (index) => ViewStoryScreen(
              // changePage: ,
              index: index,
              edges: snapshot.data.data.data.user.feedReelsTray
                  .edgeReelsTrayToReel.edges,
            ),
          ),
        ),
      ),

Here i have a method in InstagramStorySwipe which i need to call with the ViewStoryScreen

Edit: code also the whole thing is inside another class so i cant call InstagramSwipes method

Answer 1

Assuming the "method in InstagramStorySwipe" is called myMethod , you can add a parameter to the constructor of ViewStoryScreen like so:

class ViewStoryScreen extends StatelessWidget { // or StatefulWidget
  ViewStoryScreen({
    this.changePage,
    this.index,
    this.edges,
    this.myMethod,
  });

  /// The method passed by the parent
  final void Function() myMethod; // Change the signature of the function depending on myMethod

  final String changePage;

  // ...
}