How to change and simulate screen orientation in Flutter

TL;DR

• You can set the screen orientation using SystemChrome.setPreferredOrientations.
  • By specifying it before runApp, you can also fix the orientation for the entire app.
  • How to change screen orientation in flutter ? | Coding Ninja
    • https://codingninja.info/change-screen-orientation-in-flutter.html
• By rotating Widgets using RotatedBox or RotationTransition, you can simulate a screen orientation change, provided the amount of information doesn't require scrollbars.
  • You can even do things like keeping the AppBar in portrait while making the body landscape.
    • Whether you actually want to do that is another story...
  • Flutter - video_player fullscreen | Stack Overflow
    • https://stackoverflow.com/questions/52431109/flutter-video-player-fullscreen/52431324?stw=2#52431324
  • RotatedBox class | Flutter
    • https://api.flutter.dev/flutter/widgets/RotatedBox-class.html
  • RotationTransition class | Flutter
    • https://api.flutter.dev/flutter/widgets/RotationTransition-class.html

Setting the Screen Orientation

import 'package:flutter/services.dart';  // Required

// Something like this. Change `_landscape` wherever you need to.
// I used a switch case instead of a ternary operator because I thought it might be easier to read as a sample, though I'm not entirely sure if it is...
void changeLandscape() {
  switch (_landscape) {
    case false:
      SystemChrome.setPreferredOrientations(
          [DeviceOrientation.portraitDown, DeviceOrientation.portraitUp]);
      break;
    case true:
      // Use this when you want the right side to be the top.
      // If you want the left side to be the top, specify DeviceOrientation.landscapeLeft.
      SystemChrome.setPreferredOrientations(
          [DeviceOrientation.landscapeRight]);
      break;
  }
}

Fixing the Screen Orientation

• [Flutter] How to fix the screen to portrait/landscape | ryohtarot/main.dart | Gist
  • https://gist.github.com/ryohtarot/e34b7c17b207e527d9dcfb1f0e9d6ba0
• It seems separate handling is required for iPad.
  • setPreferredOrientations not working in iPad #27235 | flutter / flutter | GitHub
  • https://github.com/flutter/flutter/issues/27235

Rotating with RotatedBox

import 'package:flutter/material.dart';

...omitted
// Something like this. It's quite straightforward...
// Put your required Widget in YourWidget
// Change `_landscape` wherever you need to.
@override
Widget build(BuildContext context) {
  return RotatedBox(
            child: YourWidget(
              ),
            quarterTurns: _landscape ? 1 : 0);
...omitted

• Flutter - video_player fullscreen | Stack Overflow
  • It made me laugh that it was called "Genius!"
  • https://stackoverflow.com/questions/52431109/flutter-video-player-fullscreen/52431324?stw=2#52431324