如何从 Flutter 中的另一个小部件滚动小部件

Question

The right way to interact between widgets in flutter is Provider. But Provider manages a data, but with just scrolling, no data is supposed to be changed. How is it possible to send a scroll command (like jumpTo) between widgets placed on same level? (not like parent\child relation)

For example: there is a button that adds a new item to the ListView with provider like that:

listProvider.createItem("New item");

And the list should be scrolled down to the end after that.
How to do that?

Answer 1

Widget A{

@override build (ctx){
return B(_scrollController) ;

}


Widget B{
ScrollController scrollController;
B{this._scrollController}

}

Use this right after listProvider.createItem("New item") to scroll to bottom of listview. _scrollController.animateTo(_scrollController.position.maxScrollExtent)

Answer 2

Assuming you have access to the scrollController provided to the listView: You can call scrollController.position.moveTo(scrollcontroller.position.maxScrollExtent) after you've added the element to the ListView.

You can also add a duration to moveTo to get to scroll down more naturally.