comunicmobile/lib/ui/routes/home_route.dart

import 'package:comunic/ui/screens/conversations_list_screen.dart';
import 'package:comunic/ui/screens/friends_list_screen.dart';
import 'package:comunic/ui/screens/menus_screen.dart';
import 'package:comunic/ui/screens/newest_posts.dart';
import 'package:comunic/ui/tiles/custom_bottom_navigation_bar_item.dart';
import 'package:comunic/ui/widgets/navbar_widget.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/material.dart';

/// Main route of the application
///
/// @author Pierre HUBERT

class HomeRoute extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _HomeRouteState();
}

class _HomeRouteState extends State<HomeRoute> {
  BarCallbackActions _currTab = BarCallbackActions.OPEN_CONVERSATIONS;
  List<BarCallbackActions> history = List();

  /// Change currently visible tab
  void _changeTab(BarCallbackActions newTab) {
    setState(() {
      _currTab = newTab;
    });
  }

  /// 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(BarCallbackActions action) {
    if (_currTab != action) history.add(action);
    _changeTab(action);
  }

  @override
  void initState() {
    super.initState();
    history.add(_currTab);
  }

  /// Build the body of the application
  Widget _buildBody(BuildContext context) {
    switch (_currTab) {
      case BarCallbackActions.OPEN_CONVERSATIONS:
        return ConversationsListScreen();

      case BarCallbackActions.OPEN_NEWEST_POSTS:
        return NewestPostsScreen();

      case BarCallbackActions.OPEN_FRIENDS:
        return FriendsListScreen();

      default:
        throw "Invalid tab : " + _currTab.toString();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.blueAccent,
      child: SafeArea(
        // Avoid OS areas
        child: WillPopScope(
          onWillPop: _willPop,
          child: Scaffold(
            appBar: ComunicAppBar(
              onTap: _onTap,
              selectedAction: _currTab,
            ),
            body: SafeArea(
              child: _buildBody(context),
            ),
          ),
        ),
      ),
    );
  }
}