How to create Nested L shaped Widget in Flutter - Stack Overflow

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I want to create the following L shaped design : -

This can be created using simple Column , Row and Expanded Widgets but I am not able to think it through. Design must be responsive as the Size of the Square changes. I thought about using Container Widget and its left and bottom Border in order to make the L shape but the issue with that is Container will be nested and hence might have to use stack but Expanded Widget wont work properly inside it.

I want to create the following L shaped design : -

This can be created using simple Column , Row and Expanded Widgets but I am not able to think it through. Design must be responsive as the Size of the Square changes. I thought about using Container Widget and its left and bottom Border in order to make the L shape but the issue with that is Container will be nested and hence might have to use stack but Expanded Widget wont work properly inside it.

• flutter
• flutter-animation

Share Improve this question Follow edited Feb 15 at 4:15 Ramji asked Feb 12 at 9:38 RamjiRamji 16222 gold badges77 silver badges2626 bronze badges 5

• Use CustomPainter class. – Reza Farjam Commented Feb 12 at 10:44
• @RezaFarjam , how can I make it responsive with respect to the square size ? Can you provide a example ? – Ramji Commented Feb 12 at 11:21
• If you didn't want to use a CustomPainter, which gives you the size of the canvas, and is probably also more efficient, you might be interested in the AspectRatio widget. – JaffaKetchup Commented Feb 15 at 13:57
• @JaffaKetchup , can add a short example code on how to do it – Ramji Commented Feb 15 at 14:17
• 1 You can put bunch of Container in Stack, I am not really sure if you need tap event, else assets image is fine, – Md. Yeasin Sheikh Commented Feb 17 at 14:59

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2 Answers 2

Sorted by: Reset to default 1 +50

Following is the minimum required code for the given design:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
 const MyApp({super.key});

 @override
 Widget build(BuildContext context) {
  return MaterialApp(
   home: Scaffold(
    appBar: AppBar(
      title: const Text('LShaped Design'),
      backgroundColor: Colors.blue,
    ),
    body: SizedBox(
      height: double.maxFinite,
      width: double.maxFinite,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Stack(
            children: <Widget>[
              Container(
                width: 100,
                height: 100,
                decoration: BoxDecoration(
                  color: Colors.white60,
                  border: Border.all(color: Colors.black, style: BorderStyle.solid, width: 2)
                ),
              ),
              _lShapeContainer(lPos: 0, side: 100),
              _lShapeContainer(lPos: 10, side: 90),
              _lShapeContainer(lPos: 20, side: 80),
              _lShapeContainer(lPos: 30, side: 70),
              _lShapeContainer(lPos: 40, side: 60),
              _lShapeContainer(lPos: 50, side: 50),
              _lShapeContainer(lPos: 60, side: 40),
            ],
          ),
        ],
      ),
    ),
  ),
);}
Widget _lShapeContainer({required double lPos, required double side}) {
 return Positioned(
  left: lPos,
  child: Container(
    width: side - 15,
    height: side,
    decoration: BoxDecoration(
        color: Colors.white60,
        border: Border.all(color: Colors.black, style: BorderStyle.solid, width: 2)
    ),
  ),
);}}

The output:

Updated: Responsive design

Following is code where you can have a responsive shape. You need to adjust the height, width and multiplier according to your needs.

class HomePage extends StatelessWidget {
 const HomePage({super.key});

 @override
 Widget build(BuildContext context) {
  final double height = 100;
  final double width = 100;
  final double multiplier = 10
  return Scaffold(
   appBar: AppBar(
    title: const Text('LShaped Design'),
    backgroundColor: Colors.blue,
   ),
   body: SizedBox(
    height: double.maxFinite,
    width: double.maxFinite,
    child: Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Container(
          height: height,
          width: width + multiplier,
          color: Colors.red,
          child: AspectRatio(
            aspectRatio: 1/2,
            child: Stack(
              children: <Widget>[
                Container(
                  decoration: BoxDecoration(
                    color: Colors.white60,
                    border: Border.all(color: Colors.black, style: BorderStyle.solid, width: 2)
                  ),
                ),
                _lShapeContainer(lPos: 0, side: height, color: Colors.blue),
                _lShapeContainer(lPos: (multiplier*1), side: height - (multiplier*1), color: Colors.white24),
                _lShapeContainer(lPos: (multiplier*2), side: height - (multiplier*2), color: Colors.black26),
                _lShapeContainer(lPos: (multiplier*3), side: height - (multiplier*3), color: Colors.green),
                _lShapeContainer(lPos: (multiplier*4), side: height - (multiplier*4), color: Colors.amberAccent),
                _lShapeContainer(lPos: (multiplier*5), side: height - (multiplier*5), color: Colors.redAccent),
                _lShapeContainer(lPos: (multiplier*6), side: height - (multiplier*6), color: Colors.brown),
              ],
            ),
          ),
        ),
      ],
    ),
  ),
);}
  Widget _lShapeContainer({required double lPos, required double side, required Color color}) {
return Positioned(
  left: lPos,
  child: Container(
    width: side - 15,
    height: side,
    decoration:
        BoxDecoration(color: color, border: Border.all(color: Colors.black, style: BorderStyle.solid, width: 2)),
  ),
);}}

1. Make the squares bigger:

final double height = 200;
final double width = 200;
final double multiplier = 20;

2. Change the right side vertical container width according to your need:

width: width + multiplier,

OR

width: width,

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      body: Center(
        child: LShapedWidget(),
      ),
    ),
  ));
}

class LShapedWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Vertical part of the "L"
          Container(
            width: 50,
            height: 150,
            color: Colors.blue,
          ),
          Row(
            children: [
              // Base of the "L"
              Container(
                width: 150,
                height: 50,
                color: Colors.blue,
              ),
              // Nested L inside the bigger L
              Column(
                children: [
                  Container(
                    width: 50,
                    height: 100,
                    color: Colors.red,
                  ),
                  Row(
                    children: [
                      Container(
                        width: 100,
                        height: 50,
                        color: Colors.red,
                      )
                    ],
                  )
                ],
              )
            ],
          )
        ],
      ),
    );
  }
}

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