How to use Offstage widget in Flutter

In this Google flutter code example we are going to learn how to use Offstage 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 'offstage.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Baseline 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 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.
      home: BasicOffstage(),


import 'package:flutter/material.dart';

class BasicOffstage extends StatelessWidget {
  //A widget that lays the child out as if it was in the tree, but without painting anything, without making the
  //child available for hit testing, and without taking any room in the parent.
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Offstage Widget")),
      body: Offstage(
        //this container widget is inserted into the widget tree, but not painted to view
        child: Container(height: 50.0, width: 50.0, color:,

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