Ready to implement calls screen

lib/ui/routes/conversation_route.dart

@@ -102,6 +102,17 @@ class _ConversationRouteState extends State<ConversationRoute> {
           _conversationName == null ? tr("Loading") : _conversationName,
         ),
         actions: <Widget>[
+          // Start call (if possible)
+          _conversation == null ||
+                  _conversation.callCapabilities == CallCapabilities.NONE
+              ? Container()
+              : IconButton(
+                  icon: Icon(Icons.phone),
+                  onPressed: () => MainController.of(context)
+                      .startCall(widget.conversationID),
+                ),
+
+          // Edit conversation settings
           IconButton(
             icon: Icon(Icons.settings),
             onPressed: _openSettings,

lib/ui/routes/main_route.dart

@@ -2,6 +2,7 @@ import 'package:comunic/helpers/account_helper.dart';
 import 'package:comunic/ui/routes/account_settings/account_settings_route.dart';
 import 'package:comunic/ui/routes/app_settings_route.dart';
 import 'package:comunic/ui/routes/conversation_route.dart';
+import 'package:comunic/ui/screens/call_screen.dart';
 import 'package:comunic/ui/screens/conversations_list_screen.dart';
 import 'package:comunic/ui/screens/friends_list_screen.dart';
 import 'package:comunic/ui/screens/group_screen.dart';
@@ -75,6 +76,9 @@ abstract class MainController extends State<MainRoute> {
 
   /// Open a conversation
   void openConversation(int convID);
+
+  /// Start a call for a given conversation
+  void startCall(int convID);
 }
 
 /// Private implementation of HomeController
@@ -287,4 +291,9 @@ class _MainRouteState extends MainController {
       hideNavBar: true,
     ));
   }
+
+  @override
+  void startCall(int convID) {
+    push(CallScreen(convID: convID), hideNavBar: true);
+  }
 }

lib/ui/screens/call_screen.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+/// Call screen
+///
+/// @author Pierre Hubert
+
+class CallScreen extends StatefulWidget {
+  final int convID;
+
+  const CallScreen({Key key, @required this.convID})
+      : assert(convID != null),
+        assert(convID > 0),
+        super(key: key);
+
+  @override
+  _CallScreenState createState() => _CallScreenState();
+}
+
+class _CallScreenState extends State<CallScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Container();
+  }
+}