ScrollablePositionedList: Assert when reuse the ScrollablePositionedList about flutter.widgets HOT 14 CLOSED

@tarobins same problems

jumpTo

scrollTo

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I had the same problem when using ScrollablePositionedList in a stateless widget. Converting it to a stateful widget did the trick

Also define ItemScrollController inside initState() method.

ItemScrollController _controller;
void initState() {
// TODO: implement initState
super.initState();
_controller = ItemScrollController();
}

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I think #119 will fix this issue. Once that PR is closed, please let me know if not.

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Did you add the property itemScrollController inside the builder?

ScrollablePositionedList.builder( itemCount: 500, itemBuilder: (context, index) => Text('Item $index'), itemScrollController: itemScrollController, itemPositionListener: itemPositionListener, );

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@rockingdice I haven't been able to repo the issue. Do you have sample code available?

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@tarobins I'll try to make a repo project for you.

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I was trying to repo this issue with the withControl branch of this project: https://github.com/tarobins/page_list_demo/tree/withControl

The app has two pages with a list on each and a button that jumps the first list to 100. The button only controller the first list, and when the second list is showing, and you press the button you do get an error, kind of expectedly. Is this the situation you were running into or something else?

Thanks

Tom

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as an aside, I ran into this while trying the above #43

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I had the same problem when using ScrollablePositionedList in a stateless widget. Converting it to a stateful widget did the trick

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I also had this issue, as far as I can tell I'm using everything correctly. Converting the containing widget from Stateless to Statefull fixed it with no other changes.

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@nachoapps do you have an example of where it didn't work?

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I do in my app, but it's not extracted to a reusable case right now. Also my flutter code is trash, so, sorry about that.

If you want to take a look, here's the commit that fixed it:
tactical-retreat/dadguide-flutter@065c3fd

Basically what I did here was create a Stack that automatically puts 'to bottom' and 'to top' buttons in the upper right/left hand corner, hovering over a list. With the regular ListView this is awful and slow, but with your widget super fast!

I'm using that stack widget here:
https://github.com/nachoapps/dadguide-flutter/blob/065c3fdae1a9a5e326c70029860eeeb835c940f3/lib/screens/monster/monster_list_tab.dart#L73

My app has bottom tabs, and the behavior I saw was clicking between tabs could semi-randomly cause a red screen of death.

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Seems fixed in 1.6, thanks!

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I'm having it back on 0.1.8...

The following assertion was thrown building Container:
'package:scrollable_positioned_list/src/scrollable_positioned_list.dart': Failed assertion: line 202 pos 12: '_scrollableListState == null': is not true.

The relevant error-causing widget was
Container
lib/widgets/dive_list.dart:198
When the exception was thrown, this was the stack
#2      ItemScrollController._attach
package:scrollable_positioned_list/src/scrollable_positioned_list.dart:202
#3      _ScrollablePositionedListState.initState
package:scrollable_positioned_list/src/scrollable_positioned_list.dart:241
#4      StatefulElement._firstBuild
package:flutter/…/widgets/framework.dart:4765
#5      ComponentElement.mount
package:flutter/…/widgets/framework.dart:4601
...     Normal element mounting (111 frames)

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