From cd091b696ae5389aa3f771900e5ee04d0ab8fc2e Mon Sep 17 00:00:00 2001
From: Sikander Saleem <sikander.saleem@cloudsolutions.com.sa>
Date: Mon, 13 Mar 2023 16:12:26 +0300
Subject: [PATCH] worklist pagination added.

---
 lib/api/worklist/worklist_api_client.dart |  2 +-
 lib/ui/work_list/work_list_screen.dart    | 27 +++++++++++++++++++----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/lib/api/worklist/worklist_api_client.dart b/lib/api/worklist/worklist_api_client.dart
index 8765ddd..51e5c80 100644
--- a/lib/api/worklist/worklist_api_client.dart
+++ b/lib/api/worklist/worklist_api_client.dart
@@ -47,7 +47,7 @@ class WorkListApiClient {
     Map<String, dynamic> postParams = {
       "P_NOTIFICATION_TYPE": pNotificationType,
       "P_PAGE_NUM": pPageNum,
-      "P_PAGE_LIMIT": 50,
+      "P_PAGE_LIMIT": 20,
       "P_ITEM_TYPE": pItemType,
       "P_SEARCH_FROM_USER": pSearchUser,
       "P_SEARCH_ITEM_TYPE_DSP_NAME": pSearchItemType,
diff --git a/lib/ui/work_list/work_list_screen.dart b/lib/ui/work_list/work_list_screen.dart
index 485921d..9dea0a1 100644
--- a/lib/ui/work_list/work_list_screen.dart
+++ b/lib/ui/work_list/work_list_screen.dart
@@ -93,10 +93,12 @@ class _WorkListScreenState extends State<WorkListScreen> {
   final ScrollController _controller = ScrollController();
 
   int pNotificationType = 1;
+  ScrollController? _scrollController;
 
   @override
   void initState() {
     super.initState();
+    _scrollController = ScrollController()..addListener(_scrollListener);
     providerData = Provider.of<DashboardProviderModel>(context, listen: false);
     calculateCounter();
     if (workListItemIndex != null) getWorkList();
@@ -154,7 +156,7 @@ class _WorkListScreenState extends State<WorkListScreen> {
   ItgFormsModel? itgFormsModel;
   int? itgRequestTypeIndex;
 
-  Future<void> getWorkList({bool showLoading = true}) async {
+  Future<void> getWorkList({bool showLoading = true, bool isCallingFromRefresh = false}) async {
     try {
       if (showLoading) Utils.showLoading(context);
       if (workListItemTypes[workListItemIndex!].key == "ITG") {
@@ -173,7 +175,12 @@ class _WorkListScreenState extends State<WorkListScreen> {
         }
       } else {
         itgRequestTypeIndex = null;
-        workList = await WorkListApiClient().getWorkList(pageNumber, workListItemTypes[workListItemIndex!].key, pNotificationType.toString());
+        List<WorkListResponseModel>? _list = await WorkListApiClient().getWorkList(pageNumber, workListItemTypes[workListItemIndex!].key, pNotificationType.toString());
+        if (workList != null && _list != null && !isCallingFromRefresh) {
+          workList!.addAll(_list);
+        } else {
+          workList = _list;
+        }
         AppState().setWorkList = workList;
       }
       if (showLoading) Utils.hideLoading(context);
@@ -188,9 +195,10 @@ class _WorkListScreenState extends State<WorkListScreen> {
     try {
       _refreshController.refreshCompleted();
       Utils.showLoading(context);
+      pageNumber = 1;
       List dataOnRefresh = await Future.wait([
         providerData.fetchWorkListCounter(context, showLoading: false),
-        getWorkList(showLoading: false),
+        getWorkList(showLoading: false, isCallingFromRefresh: true),
       ]);
       calculateCounter();
       Utils.hideLoading(context);
@@ -203,9 +211,19 @@ class _WorkListScreenState extends State<WorkListScreen> {
 
   @override
   void dispose() {
+    _scrollController?.dispose();
     super.dispose();
   }
 
+  void _scrollListener() {
+    if (_scrollController!.position.pixels == _scrollController!.position.maxScrollExtent) {
+      pageNumber = pageNumber + 1;
+      if (itgRequestTypeIndex == null && workListItemTypes[workListItemIndex!].value != workList!.length) {
+        getWorkList();
+      }
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -236,6 +254,7 @@ class _WorkListScreenState extends State<WorkListScreen> {
                           }
                           if (workListItemIndex != index && !workListItemTypes[index].disable) {
                             workListItemIndex = index;
+                            pageNumber = 1;
                             if (workListItemTypes[index].value == 0) {
                               workList = [];
                               itgRequestTypeIndex = null;
@@ -273,6 +292,7 @@ class _WorkListScreenState extends State<WorkListScreen> {
                       ),
                       controller: _refreshController,
                       onRefresh: _onRefresh,
+                      scrollController: _scrollController,
                       child: SingleChildScrollView(
                         physics: const BouncingScrollPhysics(),
                         child: itgRequestTypeIndex != null
@@ -354,7 +374,6 @@ class _WorkListScreenState extends State<WorkListScreen> {
               setState(() {});
             }
           }
-
         } else {
           verifyWorkListCounter();
           if (mounted) setState(() {});