Merge pull request #196 from VITianLalit/implement_favourites_page

 Created Favorite Page

lib/favorite_page_provider.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class FavouriteScreenProvider with ChangeNotifier {
+  bool _drawingBoard = false;
+  bool get drawingBoard => _drawingBoard;
+
+  List<int> _selectedItemList = [];
+
+  List<int> get selectedItemList => _selectedItemList;
+
+  FavouriteScreenProvider() {
+    loadFromPrefs();
+  }
+
+  void setDrawingBoard() {
+    _drawingBoard = !_drawingBoard;
+    notifyListeners();
+    saveToPrefs();
+  }
+
+  void setList(int item) {
+    _selectedItemList.add(item);
+    notifyListeners();
+    saveToPrefs();
+  }
+
+  void removeList(int item) {
+    _selectedItemList.remove(item);
+    notifyListeners();
+    saveToPrefs();
+  }
+
+  Future<void> loadFromPrefs() async {
+    final prefs = await SharedPreferences.getInstance();
+    _drawingBoard = prefs.getBool('drawingBoard') ?? false;
+    _selectedItemList = prefs
+            .getStringList('selectedItemList')
+            ?.map((e) => int.parse(e))
+            .toList() ??
+        [];
+    notifyListeners();
+  }
+
+  Future<void> saveToPrefs() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('drawingBoard', _drawingBoard);
+    await prefs.setStringList('selectedItemList',
+        _selectedItemList.map((e) => e.toString()).toList());
+  }
+}

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:adaptive_theme/adaptive_theme.dart';
+import 'package:learn/favorite_page_provider.dart';
 import 'package:learn/landing_page.dart';
 import 'package:learn/pages/main_home.dart';
 import 'package:learn/utils/route/routes.dart';
@@ -9,20 +10,25 @@ import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 DateTime? currentBackPressTime;
-bool visitedGettingStartedPageOnceBool=false; //to store the value of 
+bool visitedGettingStartedPageOnceBool = false; //to store the value of
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   final savedThemeMode = await AdaptiveTheme.getThemeMode();
   final prefs = await SharedPreferences.getInstance();
-  visitedGettingStartedPageOnceBool = prefs.getBool('visitedGettingStartedPageOnce')??false; //if its is null i.e first time then set to false
+  visitedGettingStartedPageOnceBool =
+      prefs.getBool('visitedGettingStartedPageOnce') ??
+          false; //if its is null i.e first time then set to false
 
-  runApp(
-    ChangeNotifierProvider(
-      create: (context) => ThemeProvider(),
-      child: MyApp(savedThemeMode: savedThemeMode),
-    ),
-  );
+  runApp(MultiProvider(
+    providers: [
+      ChangeNotifierProvider(
+        create: (context) => ThemeProvider(),
+      ),
+      ChangeNotifierProvider(create: (context) => FavouriteScreenProvider()),
+    ],
+    child: MyApp(savedThemeMode: savedThemeMode),
+  ));
 }
 
 class MyApp extends StatelessWidget {
@@ -40,7 +46,9 @@ class MyApp extends StatelessWidget {
           theme: ThemeData.light(),
           darkTheme: ThemeData.dark(),
           themeMode: themeProvider.themeMode,
-          home: visitedGettingStartedPageOnceBool? const MainHome(): const LandingPage(), //if page opened for first time , show landing page (getting started page), else show home page
+          home: visitedGettingStartedPageOnceBool
+              ? const MainHome()
+              : const LandingPage(), //if page opened for first time , show landing page (getting started page), else show home page
           onGenerateRoute: Routers.generateRoute,
         );
       },