Stack Widget Examples

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: Text("Stack Widget: Examples")),
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  static final TextStyle bigStyle = TextStyle(fontSize: 20);

  //Stack of overlapping containers of reducing size
  final stk1 = Stack(
        children: [
          Container(
            height: 300.0,
            width: 300.0,
            color: Colors.red,
          ),
          Container(
            height: 250.0,
            width: 250.0,
            color: Colors.green,
          ),
          Container(
            height: 200.0,
            width: 200.0,
            color: Colors.yellow,
          )
        ],
      );
  
  
//Playing with Alignment property
  final stk2 = Stack(
        alignment: Alignment.center,
        children: [
          Container(
            height: 300.0,
            width: 300.0,
            color: Colors.red,
          ),
          Container(
            height: 250.0,
            width: 250.0,
            color: Colors.green,
          ),
          Container(
            height: 200.0,
            width: 200.0,
            color: Colors.yellow,
          )
        ],
      );

  //One child on top of another using Positioned
  final stk3 = Container(
        height: 400.0,
        //color: Colors.yellow,
        child: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Stack(
            alignment: Alignment.center,
            children: [
              Container(
                height: 300.0,
                width: 300.0,
                color: Colors.red,
              ),
              Positioned(
                top: 0.0,
                child: Container(
                  height: 250.0,
                  width: 250.0,
                  color: Colors.green,
                ),
              ),
            ],
          ),
        ),
      );

  //Playing with Positioned properties
  final stk4 = Container(
        height: 400.0,
        //color: Colors.yellow,
        child: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Stack(
            alignment: Alignment.center,
            children: [
              Container(
                height: 300.0,
                width: 300.0,
                color: Colors.red,
              ),
              Positioned(
                top: 0.0,
                bottom: 0.0,
                child: Container(
                  height: 250.0,
                  width: 250.0,
                  color: Colors.green,
                ),
              ),
            ],
          ),
        ),
      );

  //Playing with Positioned
  final stk5 = Container(
        height: 400.0,
        width: 350.0,
        //color: Colors.yellow,
        child: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Stack(
            alignment: Alignment.center,
            children: [
              Container(
                height: 300.0,
                width: 200.0,
                color: Colors.red,
              ),
              Positioned(
                right: 0.0,
                child: Container(
                  height: 250.0,
                  width: 150.0,
                  color: Colors.green,
                ),
              ),
            ],
          ),
        ),
      );
 

  @override
  Widget build(BuildContext context) {
    return stk5;
  }
}