Can toggle menubars

lib/ui/screens/call_screen.dart

@@ -49,6 +49,12 @@ class _CallScreenState extends SafeState<CallScreen> {
   final _renderers = Map<int, RTCVideoRenderer>();
   MediaStream _localStream;
   var _isLocalStreamVisible = true;
+  var _hideMenuBars = false;
+
+  bool get _canHideMenuBar =>
+      _hideMenuBars &&
+      _canMakeVideoCall &&
+      _renderers.keys.where((f) => f != userID()).length > 0;
 
   bool get _canMakeVideoCall =>
       _conversation.callCapabilities == CallCapabilities.VIDEO;
@@ -262,6 +268,13 @@ class _CallScreenState extends SafeState<CallScreen> {
     }
   }
 
+  /// Toggle menubar visibility
+  void _toggleMenuBarsVisibility() {
+    setState(() {
+      _hideMenuBars = !_hideMenuBars;
+    });
+  }
+
   /// Toggle local video streaming
   Future<void> _toggleStreaming(bool isVideo) async {
     if (isVideo && !_canMakeVideoCall) {
@@ -408,16 +421,22 @@ class _CallScreenState extends SafeState<CallScreen> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return GestureDetector(
-      appBar: AppBar(
+      onDoubleTap: () => _toggleMenuBarsVisibility(),
+      child: Scaffold(
+        appBar: _canHideMenuBar
+            ? null
+            : AppBar(
                 leading: IconButton(
                   icon: Icon(Icons.arrow_back),
                   onPressed: () => _leaveCall(),
                 ),
-        title:
+                title: _convName == null
-            _convName == null ? CircularProgressIndicator() : Text(_convName),
+                    ? CircularProgressIndicator()
+                    : Text(_convName),
               ),
         body: _buildBody(),
+      ),
     );
   }
 
@@ -437,9 +456,9 @@ class _CallScreenState extends SafeState<CallScreen> {
 
     return Column(
       children: <Widget>[
-        _buildMembersArea(),
+        _canHideMenuBar ? Container() : _buildMembersArea(),
         _buildVideosArea(),
-        _buildFooterArea()
+        _canHideMenuBar ? Container() : _buildFooterArea()
       ],
     );
   }
@@ -482,7 +501,8 @@ class _CallScreenState extends SafeState<CallScreen> {
               ? _buildLocalVideo()
               : Container(),
         ],
-    ));
+      ),
+    );
   }
 
   Widget _buildMemberVideo(int peerID) {