fix attachment size

lib/src/full_screen_video.dart

@@ -0,0 +1,76 @@
+import 'package:chewie/chewie.dart';
+import 'package:flutter/material.dart';
+import 'package:stream_chat_flutter/stream_chat_flutter.dart';
+import 'package:video_player/video_player.dart';
+
+import 'utils.dart';
+
+class FullScreenVideo extends StatefulWidget {
+  final Attachment attachment;
+
+  FullScreenVideo({
+    Key key,
+    @required this.attachment,
+  }) : super(key: key);
+
+  @override
+  _FullScreenVideoState createState() => _FullScreenVideoState();
+}
+
+class _FullScreenVideoState extends State<FullScreenVideo> {
+  ChewieController _chewieController;
+  VideoPlayerController _videoPlayerController;
+  bool initialized = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Builder(
+        builder: (context) {
+          if (!initialized) {
+            return Center(
+              child: CircularProgressIndicator(),
+            );
+          }
+
+          return Chewie(
+            controller: _chewieController,
+          );
+        },
+      ),
+    );
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _videoPlayerController =
+        VideoPlayerController.network(widget.attachment.assetUrl);
+    _videoPlayerController.initialize().whenComplete(() {
+      setState(() {
+        initialized = true;
+      });
+    });
+
+    _chewieController = ChewieController(
+      videoPlayerController: _videoPlayerController,
+      autoInitialize: false,
+      aspectRatio: _videoPlayerController.value.aspectRatio,
+    );
+    _videoPlayerController.addListener(() {
+      if (_videoPlayerController.value.hasError) {
+        WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
+          Navigator.pop(context);
+          launchURL(context, widget.attachment.titleLink);
+        });
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _videoPlayerController.dispose();
+    _chewieController.dispose();
+    super.dispose();
+  }
+}