refs #21: fix video aspect ratio

lib/src/message_widget.dart

@@ -39,6 +39,7 @@ class MessageWidget extends StatefulWidget {
     this.isParent = false,
     this.onMentionTap,
     this.showOtherMessageUsername = false,
+    this.showVideoFullScreen = true,
   }) : super(key: key);
 
   /// Function called on mention tap
@@ -65,6 +66,9 @@ class MessageWidget extends StatefulWidget {
   /// True if this is the parent of the thread being showed
   final bool isParent;
 
+  /// True if the video player will allow fullscreen mode
+  final bool showVideoFullScreen;
+
   @override
   _MessageWidgetState createState() => _MessageWidgetState();
 }
@@ -944,13 +948,23 @@ class _MessageWidgetState extends State<MessageWidget>
       _videoControllers[attachment.assetUrl] = videoController;
     }
 
+    return FutureBuilder<void>(
+      future: videoController.initialize(),
+      builder: (_, snapshot) {
+        if (snapshot.connectionState != ConnectionState.done) {
+          return Center(
+            child: CircularProgressIndicator(),
+          );
+        }
         ChewieController chewieController;
         if (_chuwieControllers.containsKey(attachment.assetUrl)) {
           chewieController = _chuwieControllers[attachment.assetUrl];
         } else {
           chewieController = ChewieController(
+              allowFullScreen: widget.showVideoFullScreen,
               videoPlayerController: videoController,
-          autoInitialize: true,
+              autoInitialize: false,
+              aspectRatio: videoController.value.aspectRatio,
               errorBuilder: (_, e) {
                 return Stack(
                   children: <Widget>[
@@ -975,12 +989,13 @@ class _MessageWidgetState extends State<MessageWidget>
               });
           _chuwieControllers[attachment.assetUrl] = chewieController;
         }
-
         return Chewie(
           key: ValueKey<String>(
               'ATTACHMENT-${attachment.title}-${widget.message.id}'),
           controller: chewieController,
         );
+      },
+    );
   }
 
   Future<void> _launchURL(String url) async {