Added bottom navigation to home route

lib/ui/routes/home_route.dart

@@ -1,12 +1,90 @@
+import 'package:comunic/ui/tiles/CustomBottomNavigationBarItem.dart';
 import 'package:flutter/material.dart';
 
 /// Main route of the application
 ///
 /// @author Pierre HUBERT
 
-class HomeRoute extends StatelessWidget {
+class HomeRoute extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() => _HomeRouteState();
+}
+
+class _HomeRouteState extends State<HomeRoute> {
+  int _currTab = 0;
+  List<int> history = List();
+
+
+  /// Change currently visible tab
+  void _changeTab(int newTabNumber) {
+    setState(() {
+      _currTab = newTabNumber;
+    });
+  }
+
+  /// Allows to go to previous tab
+  Future<bool> _willPop() async {
+    if (history.length == 1) return true;
+
+    history.removeLast();
+    _changeTab(history[history.length - 1]);
+    return false;
+  }
+
+  /// Handles a new tab being tapped
+  void _onTap(int number, BuildContext context) {
+    if (_currTab != number) history.add(number);
+    _changeTab(number);
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    history.add(_currTab);
+  }
+
+  /// Build the body of the application
+  Widget _buildBody(BuildContext context) {
+    switch (_currTab) {
+      case 0:
+        return Text("Conversations");
+
+      case 1:
+        return Text("Menu");
+
+      default:
+        throw "Invalid tab number : " + _currTab.toString();
+    }
+  }
+
+  /// Build navigation bar items
+  List<BottomNavigationBarItem> _buildNavigationBarItems() {
+    return <BottomNavigationBarItem>[
+      CustomNavigationBarItem(
+        icon: Icon(Icons.chat),
+        title: Text("Conversations"),
+      ),
+      CustomNavigationBarItem(
+        icon: Icon(Icons.menu),
+        title: Text("Menu"),
+      ),
+    ];
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Text("Home route");
+    return WillPopScope(
+      onWillPop: _willPop,
+      child: Scaffold(
+        body: SafeArea(
+          child: _buildBody(context),
+        ),
+        bottomNavigationBar: BottomNavigationBar(
+          currentIndex: _currTab,
+          items: _buildNavigationBarItems(),
+          onTap: (i) => _onTap(i, context),
+        ),
+      ),
+    );
   }
-}
+}

lib/ui/tiles/CustomBottomNavigationBarItem.dart

@@ -0,0 +1,13 @@
+import 'package:flutter/material.dart';
+
+/// Custom navigation bar item
+///
+/// @author Pierre HUBERT
+
+class CustomNavigationBarItem extends BottomNavigationBarItem {
+  const CustomNavigationBarItem({
+    @required Widget icon,
+    Widget title,
+    bool selected,
+  }) : super(icon: icon, title: title, backgroundColor: Colors.blue,);
+}