dart - flutter ListView scroll to index not available

Question

What I needed:

I want to scroll a list by some index, how can i do that.

What I know:

scrollToIndex should start from n index, but how can we scroll to any index?

Answer 1

Unfortunately, ListView has no built-in approach to a scrollToIndex() function. You’ll have to develop your own way to measure to that element’s offset for animateTo() or jumpTo(), or you can search through these suggested solutions/plugins or from other posts like Flutter: Scrolling to a widget in ListView

(the general scrollToIndex issue is discussed at flutter/issues/12319 since 2017, but still with no current plans)

---

But there is a different kind of ListView that does support scrollToIndex (as mentioned by Slashbin):

• ScrollablePositionedList
  • dependency: scrollable_positioned_list

You set it up exactly like ListView and works the same, except you now have access to a ItemScrollController that does:

• jumpTo({index, alignment})
• scrollTo({index, alignment, duration, curve})

Simplified example:

ItemScrollController _scrollController = ItemScrollController();

ScrollablePositionedList.builder(
  itemScrollController: _scrollController,
  itemCount: _myList.length,
  itemBuilder: (context, index) {
    return _myList[index];
  },
)

_scrollController.scrollTo(index: 150, duration: Duration(seconds: 1));

(note that this library is developed by Google but not by the core Flutter team.)