add pagination for pages

lib/pages/carton/model/carton_model.dart

@@ -4,62 +4,20 @@ import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/constants.dart';
 import 'package:fcs/domain/entities/carton.dart';
-import 'package:fcs/domain/vo/shipment_status.dart';
-import 'package:fcs/helpers/paginator.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 import 'package:fcs/pagination/paginator_listener.dart';
 import 'package:logging/logging.dart';
 
 class CartonModel extends BaseModel {
-  List<Carton> _boxes = [];
-  PaginatorListener<Carton>? cartonsByFilter;
-
   final log = Logger('CartonModel');
-  List<Carton> get boxes => _selectedIndex == 1
-      ? _boxes
-      : List<Carton>.from(_delivered?.values ?? []);
 
-  Paginator? _delivered;
-  int _selectedIndex = 1;
+  PaginatorListener<Carton>? cartonsByFilter;
+  PaginatorListener<Carton>? getBoxes;
+
+  int selectedIndex = 1;
   int _selectedIndexFilter = 1;
   bool isLoading = false;
 
-  StreamSubscription<QuerySnapshot>? listener;
-  StreamSubscription<QuerySnapshot>? cartonListener;
-  static List<ShipmentStatus> statusHistory = [
-    ShipmentStatus(status: "Packed", date: DateTime(2020, 6, 1), done: true),
-    ShipmentStatus(status: "Shipped", date: DateTime(2020, 6, 5), done: false),
-    ShipmentStatus(
-        status: "Delivered", date: DateTime(2020, 6, 15), done: false)
-  ];
-
-  // List<Carton> get completed {
-  //   return boxes.where((e) => e.status == "Delivered").toList()
-  //     ..sort((e1, e2) {
-  //       return e2.packageNumber.compareTo(e1.packageNumber);
-  //     });
-  // }
-
-  // List<Carton> get processed {
-  //   return boxes.where((e) => e.status == "Packed").toList()
-  //     ..sort((e1, e2) {
-  //       return e2.packageNumber.compareTo(e1.packageNumber);
-  //     });
-  // }
-
-  // List<Carton> get upcoming {
-  //   return boxes
-  //       .where((e) =>
-  //           e.status == "Packed" ||
-  //           // e.status == "Received" ||
-  //           e.status == "Shipped" ||
-  //           e.status == "Arrived")
-  //       .toList()
-  //         ..sort((e1, e2) {
-  //           return e2.packageNumber.compareTo(e1.packageNumber);
-  //         });
-  // }
-
   List<String> cartonTypes = [
     carton_from_packages,
     carton_from_cartons,
@@ -74,10 +32,7 @@ class CartonModel extends BaseModel {
     carton_small_bag
   ];
 
-  set selectedIndex(int index) {
-    _selectedIndex = index;
-    notifyListeners();
-  }
+  int get selectedIndexFilter => _selectedIndexFilter;
 
   set selectedIndexFilter(int index) {
     _selectedIndexFilter = index;
@@ -86,19 +41,6 @@ class CartonModel extends BaseModel {
     notifyListeners();
   }
 
-  int get selectedIndex => _selectedIndex;
-  int get selectedIndexFilter => _selectedIndexFilter;
-
-  initData() async {
-    _selectedIndex = 1;
-    _selectedIndexFilter = 1;
-    _loadBoxes();
-
-    if (_delivered != null) _delivered!.close();
-    _delivered = _getDelivered();
-    _delivered!.load();
-  }
-
   @override
   void privilegeChanged() {
     if (user != null || !user!.hasCarton()) {
@@ -106,40 +48,54 @@ class CartonModel extends BaseModel {
     }
   }
 
+  void initUser(user) {
+    super.initUser(user);
+  }
+
+  @override
+  logout() async {
+    getBoxes?.close();
+    cartonsByFilter?.close();
+  }
+
   Future<void> _initData() async {
     logout();
     _selectedIndexFilter = 1;
-
     _loadPaginationCartons(
         _selectedIndexFilter == 1 ? "carton_weight" : "user_name");
   }
 
-  Future<void> _loadBoxes() async {
+  onChanged(int index) {
+    selectedIndex = index;
+    loadPaginationBoxes(selectedIndex);
+    notifyListeners();
+  }
+
+  Future<void> loadPaginationBoxes(int index) async {
     if (user == null || !user!.hasCarton()) return;
-    String path = "/$cartons_collection/";
-    if (listener != null) listener!.cancel();
-    _boxes = [];
-    try {
-      listener = FirebaseFirestore.instance
-          .collection("$path")
-          .where("status",
-              whereIn: [carton_packed_status, carton_shipped_status])
-          .where("is_deleted", isEqualTo: false)
-          .orderBy("created_at", descending: true)
-          .snapshots()
-          .listen((QuerySnapshot snapshot) {
-            _boxes.clear();
-            _boxes = snapshot.docs.map((documentSnapshot) {
-              var s = Carton.fromMap(
-                  documentSnapshot.data() as Map<String, dynamic>,
-                  documentSnapshot.id);
-              return s;
-            }).toList();
-            notifyListeners();
-          });
-    } catch (e) {
-      log.warning("Error!! $e");
+
+    String path = "/$cartons_collection";
+    Query col = FirebaseFirestore.instance.collection(path);
+    Query pageQuery = FirebaseFirestore.instance.collection(path);
+
+    if (index == 1) {
+      col = col.where("status",
+          whereIn: [carton_packed_status, carton_shipped_status]);
+      pageQuery = pageQuery.where("status",
+          whereIn: [carton_packed_status, carton_shipped_status]);
     }
+
+    if (index == 2) {
+      col = col.where("is_delivered", isEqualTo: true);
+      pageQuery = pageQuery.where("is_delivered", isEqualTo: true);
+    }
+
+    pageQuery = pageQuery.orderBy("created_at", descending: true);
+
+    getBoxes?.close();
+    getBoxes = PaginatorListener<Carton>(
+        col, pageQuery, (data, id) => Carton.fromMap(data, id),
+        rowPerLoad: 30);
   }
 
   _loadPaginationCartons(String orderName) {
@@ -164,49 +120,6 @@ class CartonModel extends BaseModel {
         rowPerLoad: 30);
   }
 
-  Paginator? _getDelivered() {
-    if (user == null || !user!.hasCarton()) return null;
-
-    var pageQuery = FirebaseFirestore.instance
-        .collection("/$cartons_collection")
-        .where("is_delivered", isEqualTo: true)
-        .where("is_deleted", isEqualTo: false);
-    var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
-      return Carton.fromMap(data, id);
-    });
-    return paginator;
-  }
-
-  Future<void> loadMore() async {
-    if (_delivered == null && _delivered!.ended || selectedIndex == 1) return;
-    isLoading = true;
-    notifyListeners();
-    await _delivered!.load(onFinished: () {
-      isLoading = false;
-      notifyListeners();
-    });
-  }
-
-  Future<void> refresh() async {
-    if (selectedIndex == 1) return;
-    await _delivered?.refresh(onFinished: () {
-      notifyListeners();
-    });
-  }
-
-  void initUser(user) {
-    super.initUser(user);
-  }
-
-  @override
-  logout() async {
-    if (listener != null) await listener!.cancel();
-    if (cartonListener != null) await cartonListener!.cancel();
-    if (_delivered != null) _delivered!.close();
-    if (cartonsByFilter != null) cartonsByFilter!.close();
-    _boxes = [];
-  }
-
   Future<List<Carton>> getCartons(String shipmentID) async {
     String path = "/$cartons_collection";
     var querySnap = await FirebaseFirestore.instance