GridView height fit the children height flutter

L39hommeSage
February 15, 2023
196 views
1 vote
2 Answers

I’m confuse about the usage of gridview in flutter.
I want to display a list of features with their rates.
The feature component/widget isn’t that big in term of height but when I place them in a gridview the height of each case is way more bigger that it needs to be.

How can I control the height of each case to fit the child height ?

here is my code :

import 'package:flutter/material.dart';
import 'package:project/Components/ReviewComps/AttributeRatings.dart';
    
class ReviewPage extends StatelessWidget {
      const ReviewPage({Key? key}) : super(key: key);
    
      @override
      Widget build(BuildContext context) {
        return Scaffold(
            body: SingleChildScrollView(
          child: Container(
            padding: const EdgeInsets.all(20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisAlignment: MainAxisAlignment.start,
              children: const <Widget>[
                AttributeRatings(),
              ],
            ),
          ),
        ));
      }
    }

here is my gridview that create problems :

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    var featureList = [
      _featureItems(4),
      _featureItems(3.2),
      _featureItems(1),
    ];
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        const Text("Features average rating"),
        GridView.count(
          crossAxisCount: 2,
          crossAxisSpacing: 20,
          shrinkWrap: true,
          physics: const NeverScrollableScrollPhysics(),
          children: featureList,
        ),
      ],
    );
  }
}

Container _featureItems(double rate) {
  return Container(
    color: Colors.red,
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            const Text('Feature'),
            Text(rate.toString()),
          ],
        ),
        Stack(
          children: [
            Container(
              height: 2,
              width: double.infinity,
              color: const Color(0xffDBDFED),
            ),
            FractionallySizedBox(
              widthFactor: rate / 5,
              child: Container(
                height: 2,
                color: const Color(0xff39B0EA),
              ),
            )
          ],
        )
      ],
    ),
  );
}

Tags: flutter gridview

Answers

Chosen as BEST ANSWER

The solution I found is quite complicated but I changed the gridview to a list view and put rows inside. The most dificult was to work with odd lengths lists here is my solution :

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    var featureList = [4, 3.2, 4, 2, 3.2];
    double nbRows = featureList.length % 2 == 0
        ? (featureList.length / 2)
        : (featureList.length / 2) + 1;
    var reworkedFeatureList = [];
    if (featureList.length % 2 == 0) {
      for (var i = 0; i < (featureList.length - 1) / 2; i++) {
        reworkedFeatureList.add([featureList[i * 2], featureList[(i * 2) + 1]]);
      }
    } else {
      final retVal = featureList.removeLast();
      for (var i = 0; i < (featureList.length - 1) / 2; i++) {
        reworkedFeatureList.add([featureList[i * 2], featureList[(i * 2) + 1]]);
      }
      reworkedFeatureList.add([retVal, -1]);
    }
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        const Text("Features average rating"),
        ListView.separated(
          separatorBuilder: (context, index) {
            return const SizedBox(height: 12);
          },
          itemCount: nbRows.toInt(),
          shrinkWrap: true,
          physics: const NeverScrollableScrollPhysics(),
          itemBuilder: (context, index) =>
              _featureItemsRow(reworkedFeatureList[index]),
        ),
      ],
    );
  }
}

Row _featureItemsRow(var rates) {
  return Row(
    children: [
      Expanded(
          child: Padding(
        padding: const EdgeInsets.only(right: 10.0),
        child: _featureItem(rates[0].toDouble()),
      )),
      Expanded(
          child: Padding(
        padding: const EdgeInsets.only(left: 10.0),
        child: _featureItem(rates[1].toDouble()),
      )),
    ],
  );
}

Column _featureItem(double rate) {
  if (rate == -1) {
    return Column();
  } else {
    return Column(
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            const Text('Feature'),
            Text(rate.toString()),
          ],
        ),
        Stack(
          children: [
            Container(
              height: 2,
              width: double.infinity,
              color: const Color(0xffDBDFED),
            ),
            FractionallySizedBox(
              widthFactor: rate / 5,
              child: Container(
                height: 2,
                color: const Color(0xff39B0EA),
              ),
            )
          ],
        )
      ],
    );
  }
}

(Edit)

You can give childAspectRatio to customise a height as following

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    var featureList = [
      _featureItems(4),
      _featureItems(3.2),
      _featureItems(1),
    ];
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        const Text("Features average rating"),
        GridView.count(
          crossAxisCount: 2,
          crossAxisSpacing: 20,
          childAspectRatio: 4,//You may have to calculate based on screen size
          shrinkWrap: true,
          physics: const NeverScrollableScrollPhysics(),
          children: featureList,
        ),
      ],
    );
  }
}

Container _featureItems(double rate) {
  return Container(
    color: Colors.red,
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            const Text('Feature'),
            Text(rate.toString()),
          ],
        ),
        Stack(
          children: [
            Container(
              height: 2,
              width: double.infinity,
              color: const Color(0xffDBDFED),
            ),
            FractionallySizedBox(
              widthFactor: rate / 5,
              child: Container(
                height: 2,
                color: const Color(0xff39B0EA),
              ),
            )
          ],
        )
      ],
    ),
  );
}

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