In Flutter, nested listview without fixed height has a overflow and non-scrollable

Question

In my project, I have implemented a questionnaire format page.

One questionnaire has a many parts (1,2,3 ...) and each part has a many questions.

And, the questions have a many selects (Very bad, bad, so-so, good, Very good, etc.).

To implement this page, I chose a nested listview (inside listview, another listview is existed).

This is a sample code that has a same widget tree with mine.

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          const Text('this is text inside 1st column. blue container'),
          Column(
            children: [
              const Text('this is text inside 2nd column. about part title'),
              ListView.separated(
                shrinkWrap: true,
                itemBuilder: (BuildContext firstListViewContext,
                    int firstListViewIndex) {
                  return Column(
                    children: [
                      const Text(
                          'this is text inside 1st listview and 3nd column. question title'),
                      ListView.separated(
                        shrinkWrap: true,
                        itemBuilder: (BuildContext context, int index) {
                          return Text(
                              'this is text inside 2nd listview and 3nd column, question selector list');
                        },
                        separatorBuilder: (BuildContext context, int index) =>
                            const SizedBox(height: 4),
                        itemCount: 20,
                      ),
                    ],
                  );
                },
                separatorBuilder: (BuildContext context, int index) =>
                    const SizedBox(height: 4),
                itemCount: 1,
              ),
            ],
          ),
          Spacer(),
          ElevatedButton(
              onPressed: () {},
              child: Text('this is button inside 1st column.')),
        ],
      ),
    );
  }
}

Above code has a overflow problem and the question listview cannot be scrolled...

Is there any way I can get rid of overflows in the code above and scroll down the problem list?

Edit 1.

In my code, only question's listview should be scrollable.

The button should be attached to the bottom of the screen.

eamirho3ein · Accepted Answer · 2022-08-31 18:10:58Z

1

Try this:

Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          const Text('this is text inside 1st column. blue container'),
          Expanded(
            child: Column(
              children: [
                const Text('this is text inside 2nd column. about part title'),
                Expanded(
                  child: ListView.separated(
                    itemBuilder: (BuildContext firstListViewContext,
                        int firstListViewIndex) {
                      return Column(
                        children: [
                          const Text(
                              'this is text inside 1st listview and 3nd column. question title'),
                          ListView.separated(
                            physics: NeverScrollableScrollPhysics(),// <---- update: add this
                            shrinkWrap: true,
                            itemBuilder: (BuildContext context, int index) {
                              return Text(
                                  'this is text inside 2nd listview and 3nd column, question selector list');
                            },
                            separatorBuilder:
                                (BuildContext context, int index) =>
                                    const SizedBox(height: 4),
                            itemCount: 20,
                          ),
                        ],
                      );
                    },
                    separatorBuilder: (BuildContext context, int index) =>
                        const SizedBox(height: 4),
                    itemCount: 1,
                  ),
                ),
              ],
            ),
          ),
          Spacer(),
          ElevatedButton(
              onPressed: () {},
              child: Text('this is button inside 1st column.')),
        ],
      )

edited Aug 31, 2022 at 18:10

answered Aug 31, 2022 at 5:18

eamirho3ein

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5 Comments

Jun Over a year ago

In my emulator, your code is not working... Is it a matter of my development environment...?

eamirho3ein Over a year ago

does it give you an error? or something?

Jun Over a year ago

any error is given but, the listview cannot be scrolled

eamirho3ein Over a year ago

if you can see the third line of my screen shot, you may see I can scroll the list. Are you exactly copy my answer and not happend?

eamirho3ein Over a year ago

I updated my answer. the inner listview scroll physic was interrupted the other so scroll worked only in specific situation. but by add physics: NeverScrollableScrollPhysics() will disable the inner listview scroll and every thing work fine.

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