The question is difficult to understand due to machine translation. Sorry.

I am looking for a way to actively stop the scrolling of a ScrollView in Flutter.

The action is Scroll state -> multiple touches -> idle scrolling I'm thinking of a flow like this.

The Listener widget is already able to acquire multiple touches I can also get the scrolling state with NotificationListener, but I am not able to stop it from here. but we are not able to stop it from here.

In the ScrollPosition documentation I have confirmed that there is a method called beginActivity(ScrollActivity? newActivity), but I am not sure how to implement this method. I am not sure how to implement this method.

I would appreciate it if someone could help me solve this problem.

return Scaffold(
  body: NotificationListener<ScrollNotification>(
    onNotification: (ScrollNotification scrollNotification) {

      if(_touchCount >= 2)
      {
        setState(() {
            //We plan to include a scroll stop process in this.
        });
      }

      return true;
    },
    child: Listener(
      onPointerDown: incrementEnter,
      onPointerUp: incrementExit,
      onPointerCancel: incrementExit,
          child: SingleChildScrollView(
            
          ),
    ),
  ),
);

CodePudding user response：

You're going to need to create a ScrollController which should be owned by State and passed into your SingleChildScrollView.

Subclass ScrollController and add a method to call or a member to set when your touch count threshold is met to tell the controller to stop. By stop I mean override createScrollPosition and return the old position if that stop flag is true otherwise have the override return super.createScrollPosition.

Just to be clear, listening to the ScrollNotification and setState is unnecessary. All the logic should be in the scroll controller.