How to use FittedBox widget in Flutter

In this Google flutter code example we are going to learn how to use FittedBox widget in Flutter.

You can copy and adopt this source code example to your android project without reinventing the wheel.

The comments on the code provide more detailed explanation

The code is based on flutter version 1 and 2.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'fittedbox.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Align Widget',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: BasicFittedBox(),
    );
  }
}

fittedbox.dart

import 'package:flutter/material.dart';

class BasicFittedBox extends StatelessWidget {
  //Scales and positions its child within itself according to fit.
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("FittedBox Widget")),
      body: Center(
        child: FittedBox(
          //set the fit property with th BoxFit class
          //BoxFit.contain: As large as possible while still containing the source entirely within the target box.
          //BoxFit.cover: As small as possible while still covering the entire target box.
          //BoxFit.fill: Fill the target box by distorting the source's aspect ratio.
          //BoxFit.fitHeight: Make sure the full height of the source is shown, regardless of whether this means the source overflows the target box horizontally.
          //BoxFit.fitWidth: Make sure the full width of the source is shown, regardless of whether this means the source overflows the target box vertically.
          //BoxFit.none: Align the source within the target box (by default, centering) and discard any portions of the source that lie outside the box.
          //BoxFit.scaleDown: Align the source within the target box (by default, centering) and, if necessary, scale the source down to ensure that the source fits within the box.

          //you can also set alignment property to properly align the child
          fit: BoxFit.contain,
          child: Container(
            height: 80.0,
            width: 80.0,
            color: Colors.red,
          ),
        ),
      ),
    );
  }
}

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