how to update the previous page from the current page child stateless widget after Navigator.pushNam-CodePudding

I have a page (stateful widget) that loads a child widget, this child widget is a grid, and it's loads another child widget a single grid item details.

on single grid item details, there is InkWell, and when onTap I Navigate to a new page.

the grid widget and the single grid item are both stateless widgets

when I go back from the new page using the back button I would like to update the previews page.

for example from the single grid item i have:

Navigator.pushNamed(
          context,
          SingleMoviePage.routeName,
          arguments: movie,
        ).then((_){
          var pressed = Provider.of<MoviesListProvider>(context,listen: false).listPageButtonPressed;
          if (pressed) {
            updateChanges();
          }
        });

I can update the page by passing the updateChanges function to grid widget and from the grid widget to the page. but is there a better way to do it using provider ? or another way without the need to send the function from child to parent and from the parent to the grandparent ?

CodePudding user response：

First of all you can do so by putting your data source in a ChangeNotifier and when it's updated you can notify all widgets that depend on it.

Another fast solution is to access the statful widget's state using a GlobalKey like this:

GlobalKey<yourStateFulWidget> myKey = GlobalKey()

and then access and edite the data like:

 myKey.currentState!.someFunctionOrData();

note: to get a better understanding on how to do the first solution I recommend you to read the official example by the flutter team here:

https://docs.flutter.dev/development/data-and-backend/state-mgmt/simple