Fix rotate button behavior on iOS (#138)

lib/screens/channel/stores/video_store.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 
+import 'package:device_info_plus/device_info_plus.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:frosty/api/twitch_api.dart';
@@ -37,6 +38,9 @@ abstract class VideoStoreBase with Store {
   @readonly
   var _overlayVisible = true;
 
+  @readonly
+  var _isIPad = false;
+
   @readonly
   StreamTwitch? _streamInfo;
 
@@ -152,13 +156,25 @@ abstract class VideoStoreBase with Store {
     return NavigationDecision.prevent;
   }
 
-  void initVideo() {
+  @action
+  Future<void> initVideo() async {
     try {
       controller?.runJavascript('document.getElementsByTagName("video")[0].addEventListener("pause", () => Pause.postMessage("video paused"));');
       controller?.runJavascript('document.getElementsByTagName("video")[0].addEventListener("play", () => Play.postMessage("video playing"));');
     } catch (e) {
       debugPrint(e.toString());
     }
+
+    // Determine whether the device is an iPad or not.
+    // Used to show or hide the rotate button on the overlay.
+    // Flutter doesn't allow programmatic rotation on iPad unless multitasking is disabled.
+    final deviceInfo = DeviceInfoPlugin();
+    final info = await deviceInfo.iosInfo;
+    if (info.model?.toLowerCase().contains('ipad') == true) {
+      _isIPad = true;
+    } else {
+      _isIPad = false;
+    }
   }
 
   void requestPictureInPicture() {

lib/screens/channel/stores/video_store.g.dart

@@ -101,6 +101,24 @@ mixin _$VideoStore on VideoStoreBase, Store {
     });
   }
 
+  late final _$_isIPadAtom =
+      Atom(name: 'VideoStoreBase._isIPad', context: context);
+
+  bool get isIPad {
+    _$_isIPadAtom.reportRead();
+    return super._isIPad;
+  }
+
+  @override
+  bool get _isIPad => isIPad;
+
+  @override
+  set _isIPad(bool value) {
+    _$_isIPadAtom.reportWrite(value, super._isIPad, () {
+      super._isIPad = value;
+    });
+  }
+
   late final _$_streamInfoAtom =
       Atom(name: 'VideoStoreBase._streamInfo', context: context);
 
@@ -136,6 +154,14 @@ mixin _$VideoStore on VideoStoreBase, Store {
         .run(() => super.handleToggleOverlay());
   }
 
+  late final _$initVideoAsyncAction =
+      AsyncAction('VideoStoreBase.initVideo', context: context);
+
+  @override
+  Future<void> initVideo() {
+    return _$initVideoAsyncAction.run(() => super.initVideo());
+  }
+
   late final _$VideoStoreBaseActionController =
       ActionController(name: 'VideoStoreBase', context: context);
 

lib/screens/channel/video_chat.dart

@@ -433,18 +433,35 @@ class _VideoOverlay extends StatelessWidget {
     );
 
     final rotateButton = IconButton(
-      tooltip: orientation == Orientation.portrait ? 'Enter Landscape Mode (Lock)' : 'Exit Landscape Mode',
+      tooltip: orientation == Orientation.portrait ? 'Enter Landscape Mode' : 'Exit Landscape Mode',
+      icon: const Icon(
+        Icons.screen_rotation,
+        color: Colors.white,
+      ),
       onPressed: () {
-        if (orientation == Orientation.portrait) {
-          SystemChrome.setPreferredOrientations([
-            DeviceOrientation.landscapeRight,
-            DeviceOrientation.landscapeLeft,
-          ]);
+        if (Platform.isIOS) {
+          if (orientation == Orientation.portrait) {
+            SystemChrome.setPreferredOrientations([
+              DeviceOrientation.landscapeRight,
+            ]);
+            SystemChrome.setPreferredOrientations([]);
+          } else {
+            SystemChrome.setPreferredOrientations([
+              DeviceOrientation.portraitUp,
+            ]);
+            SystemChrome.setPreferredOrientations([]);
+          }
         } else {
-          SystemChrome.setPreferredOrientations([]);
+          if (orientation == Orientation.portrait) {
+            SystemChrome.setPreferredOrientations([
+              DeviceOrientation.landscapeRight,
+              DeviceOrientation.landscapeLeft,
+            ]);
+          } else {
+            SystemChrome.setPreferredOrientations([]);
+          }
         }
       },
-      icon: orientation == Orientation.portrait ? const Icon(Icons.screen_lock_rotation) : const Icon(Icons.screen_rotation),
     );
 
     final streamInfo = videoStore.streamInfo;
@@ -600,7 +617,7 @@ class _VideoOverlay extends StatelessWidget {
                     ),
                   if (videoStore.settingsStore.fullScreen && orientation == Orientation.landscape) chatOverlayButton,
                   refreshButton,
-                  rotateButton,
+                  if (!videoStore.isIPad) rotateButton,
                   if (orientation == Orientation.landscape) fullScreenButton,
                 ],
               ),