How can I detect continuously if scrolling is disabled in Flutter?

Question

I want to constantly check if scrolling is not possible.

  @override
  void initState() {
    super.initState();

    WidgetsBinding.instance!.addPostFrameCallback((duration) {

      print("${_scrollViewController.position.maxScrollExtent}");
      // prints true if scrollable else false
      print("isScrollable = ${_scrollViewController.position.maxScrollExtent != 0}");

    });
  }

I've tried this code, but it's only detected once and not continuously. What should I do?

Solution

Use NotificationListener widget.

example:

NotificationListener<ScrollNotification>(
  child: ListView(
     children: MyListChilren()),
  onNotification: (ScrollNotification scrollNotif) {
    print(scrollNotif.metrics.maxScrollExtent);
  },
);