news and news details

lib/pages/home/news/news_details/news_details.dart

@@ -1,76 +1,70 @@
+import 'package:didvan/pages/home/news/news_details/news_details_state.dart';
 import 'package:didvan/widgets/didvan/page_view.dart';
-import 'package:didvan/widgets/didvan/text.dart';
 import 'package:didvan/widgets/floating_navigation_bar.dart';
-import 'package:didvan/widgets/skeletun_image.dart';
+import 'package:didvan/widgets/state_handlers/state_handler.dart';
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
-class NewsDetails extends StatelessWidget {
+class NewsDetails extends StatefulWidget {
-  const NewsDetails({Key? key}) : super(key: key);
+  final Map<String, dynamic> pageData;
+  const NewsDetails({Key? key, required this.pageData}) : super(key: key);
+
+  @override
+  State<NewsDetails> createState() => _NewsDetailsState();
+}
+
+class _NewsDetailsState extends State<NewsDetails> {
+  final ScrollController _scrollController = ScrollController();
+
+  @override
+  void initState() {
+    final state = context.read<NewsDetailsState>();
+    state.args = widget.pageData['args'];
+    Future.delayed(Duration.zero, () {
+      state.getNewsDetails(widget.pageData['id']);
+    });
+    super.initState();
+  }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      body: Stack(
+      body: Consumer<NewsDetailsState>(
+        builder: (context, state, child) => StateHandler<NewsDetailsState>(
+          onRetry: () => state.getNewsDetails(state.currentNews.id),
+          state: state,
+          builder: (context, state) => Stack(
             children: [
+              if (state.news.isNotEmpty)
                 DidvanPageView(
-            pages: [
+                  isRadar: false,
-              Column(
+                  initialIndex: state.initialIndex,
-                crossAxisAlignment: CrossAxisAlignment.start,
+                  onPageChanged: _onPageChnaged,
-                children: [
+                  scrollController: _scrollController,
-                  const SkeletonImage(
+                  items: state.news,
-                    imageUrl: 'https://wallpapercave.com/wp/wp9373116.jpg',
-                    width: double.infinity,
-                    height: 200,
                 ),
-                  const SizedBox(height: 20),
+              if (state.news.isNotEmpty)
-                  for (var i = 0; i < 10; i++)
+                Positioned(
-                    Padding(
+                  bottom: 0,
-                      padding: const EdgeInsets.symmetric(horizontal: 16),
-                      child: Builder(
-                        builder: (context) {
-                          switch (i) {
-                            case 0:
-                              return Column(
-                                crossAxisAlignment: CrossAxisAlignment.start,
-                                children: [
-                                  DidvanText(
-                                    'تحلیل شکاف فناوری صنعت فولاد ایران',
-                                    style:
-                                        Theme.of(context).textTheme.bodyText1,
-                                  ),
-                                  const SizedBox(height: 8),
-                                  const DidvanText(
-                                    'پایگاه خبری معدن نیوز - 2 ساعت پیش',
-                                  ),
-                                  const SizedBox(height: 8),
-                                ],
-                              );
-                            default:
-                              return const Padding(
-                                padding: EdgeInsets.only(bottom: 8),
-                                child: DidvanText(
-                                  'این سایت امروز (شنبه) تیم منتخب قاره آسیا در سال ۲۰۲۱ میلادی را معرفی کرد که از ایران، سردار آزمون و محمد حسین کنعانی‌زادگان در ترکیب اصلی و مهدی طارمی و سیدمجید حسینی در جمع بازیکنان ذخیره دیده می‌شوند.',
-                                ),
-                              );
-                          }
-                        },
-                      ),
-                    ),
-                  const SizedBox(height: 20),
-                ],
-              ),
-            ],
-          ),
-          const Positioned(
                   left: 0,
                   right: 0,
-            bottom: 0,
                   child: FloatingNavigationBar(
-              isRadar: false,
+                    news: state.currentNews,
+                    scrollController: _scrollController,
                   ),
                 ),
             ],
           ),
+        ),
+      ),
+    );
+  }
+
+  void _onPageChnaged(int index) {
+    final state = context.read<NewsDetailsState>();
+    state.getNewsDetails(
+      state.news[index]!.id,
+      isForward: state.currentIndex < index,
     );
   }
 }

lib/pages/home/news/news_details/news_details_state.dart

@@ -1,3 +1,73 @@
-import 'package:didvan/providers/core_provider.dart';
+import 'dart:math';
 
-class NewsDetailsState extends CoreProvier {}
+import 'package:didvan/models/enums.dart';
+import 'package:didvan/models/news_details_data.dart';
+import 'package:didvan/models/requests/news.dart';
+import 'package:didvan/providers/core_provider.dart';
+import 'package:didvan/services/network/request.dart';
+import 'package:didvan/services/network/request_helper.dart';
+
+class NewsDetailsState extends CoreProvier {
+  final List<NewsDetailsData?> news = [];
+  late final int initialIndex;
+  late final NewsRequestArgs args;
+
+  int _currentIndex = 0;
+  int get currentIndex => _currentIndex;
+
+  NewsDetailsData get currentNews => news[_currentIndex]!;
+
+  Future<void> getNewsDetails(int id, {bool? isForward}) async {
+    if (isForward == null) {
+      appState = AppState.busy;
+    }
+    final service = RequestService(RequestHelper.newsDetails(id, args));
+    await service.httpGet();
+    if (service.isSuccess) {
+      final result = service.result;
+      NewsDetailsData? prevNews;
+      if (result['prevNews'].isNotEmpty) {
+        prevNews = NewsDetailsData.fromJson(result['prevNews']);
+      }
+      final newsItem = NewsDetailsData.fromJson(result['news']);
+      NewsDetailsData? nextNews;
+      if (result['nextNews'].isNotEmpty) {
+        nextNews = NewsDetailsData.fromJson(result['nextNews']);
+      }
+      if (isForward == null) {
+        news.addAll(List.generate(max(newsItem.order - 2, 0), (index) => null));
+        if (prevNews != null) {
+          news.add(prevNews);
+        }
+        news.add(newsItem);
+        if (nextNews != null) {
+          news.add(nextNews);
+        }
+        _currentIndex = initialIndex = newsItem.order - 1;
+      } else if (isForward) {
+        if (!exists(nextNews) && nextNews != null) {
+          news.add(nextNews);
+        }
+        _currentIndex++;
+      } else if (!isForward) {
+        if (!exists(prevNews) && prevNews != null) {
+          news[_currentIndex - 2] = prevNews;
+        }
+        _currentIndex--;
+      }
+      appState = AppState.idle;
+      return;
+    }
+    if (isForward == null) {
+      appState = AppState.failed;
+    }
+  }
+
+  bool exists(NewsDetailsData? newsItem) =>
+      news.any((n) => newsItem != null && n != null && n.id == newsItem.id);
+
+  void onCommentAdded(int id) {
+    news.firstWhere((item) => item!.id == id)!.comments++;
+    notifyListeners();
+  }
+}

lib/pages/home/news/news_state.dart

@@ -1,20 +1,31 @@
 import 'package:collection/collection.dart';
 import 'package:didvan/models/enums.dart';
 import 'package:didvan/models/news_overview.dart';
+import 'package:didvan/models/requests/news.dart';
 import 'package:didvan/providers/core_provider.dart';
 import 'package:didvan/services/network/request.dart';
 import 'package:didvan/services/network/request_helper.dart';
 
 class NewsState extends CoreProvier {
-  bool isFiltering = false;
   String search = '';
   String lastSearch = '';
   String? startDate;
   String? endDate;
+  int page = 1;
 
   final List<MapEntry> _markQueue = [];
   final List<NewsOverview> news = [];
 
+  void init() {
+    search = '';
+    lastSearch = '';
+    startDate = null;
+    endDate = null;
+    Future.delayed(Duration.zero, () {
+      getNews(page: 1);
+    });
+  }
+
   void resetFilters() {
     startDate = null;
     endDate = null;
@@ -24,22 +35,24 @@ class NewsState extends CoreProvier {
   Future<void> getNews({
     required int page,
   }) async {
-    if (search != '' || filterApplied) {
+    if (this.page == page) {
+      news.clear();
+    }
+    this.page = page;
+    if (search != '') {
       lastSearch = search;
-      isFiltering = true;
-    } else {
-      isFiltering = false;
     }
     lastSearch = search;
     appState = AppState.busy;
-    news.clear();
     final service = RequestService(
       RequestHelper.newsOverviews(
+        args: NewsRequestArgs(
           page: 1,
           startDate: startDate?.split(' ').first,
           endDate: endDate?.split(' ').first,
           search: search == '' ? null : search,
         ),
+      ),
     );
     await service.httpGet();
     if (service.isSuccess) {
@@ -53,7 +66,7 @@ class NewsState extends CoreProvier {
     appState = AppState.failed;
   }
 
-  Future<void> markNews(int id) async {
+  Future<void> mark(int id) async {
     news.firstWhere((element) => element.id == id).marked = true;
     notifyListeners();
     _markQueue.add(MapEntry(id, true));
@@ -69,7 +82,7 @@ class NewsState extends CoreProvier {
     });
   }
 
-  Future<void> unMarkNews(int id) async {
+  Future<void> unMark(int id) async {
     news.firstWhere((element) => element.id == id).marked = false;
     notifyListeners();
     _markQueue.add(MapEntry(id, false));
@@ -85,5 +98,5 @@ class NewsState extends CoreProvier {
     });
   }
 
-  bool get filterApplied => startDate != null || endDate != null;
+  bool get isFiltering => startDate != null || endDate != null;
 }

lib/pages/home/news/widgets/news_item.dart

@@ -1,13 +1,14 @@
 import 'package:didvan/models/news_overview.dart';
+import 'package:didvan/models/requests/news.dart';
 import 'package:didvan/pages/home/news/news_state.dart';
 import 'package:didvan/routes/routes.dart';
+import 'package:didvan/utils/date_time.dart';
 import 'package:didvan/widgets/bookmark_button.dart';
 import 'package:didvan/widgets/didvan/card.dart';
 import 'package:didvan/widgets/didvan/divider.dart';
 import 'package:didvan/widgets/didvan/text.dart';
 import 'package:didvan/widgets/skeleton_image.dart';
 import 'package:flutter/material.dart';
-import 'package:persian_number_utility/persian_number_utility.dart';
 import 'package:provider/provider.dart';
 
 class NewsItem extends StatelessWidget {
@@ -23,6 +24,12 @@ class NewsItem extends StatelessWidget {
         arguments: {
           'state': state,
           'id': news.id,
+          'args': NewsRequestArgs(
+            page: state.page,
+            endDate: state.endDate,
+            search: state.search,
+            startDate: state.startDate,
+          )
         },
       ),
       child: Column(
@@ -55,15 +62,23 @@ class NewsItem extends StatelessWidget {
           const DidvanDivider(verticalPadding: 8),
           Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Row(
                 children: [
                   DidvanText(
-                '${news.reference} | ${DateTime.parse(news.createdAt).toPersianDateStr()}',
+                    news.reference,
-                style: Theme.of(context).textTheme.overline,
+                    style: Theme.of(context).textTheme.caption,
+                  ),
+                  DidvanText(
+                    ' - ' + DateTimeUtils.momentGenerator(news.createdAt),
+                    style: Theme.of(context).textTheme.caption,
+                  ),
+                ],
               ),
               BookmarkButton(
                 value: news.marked,
-                onMark: () => state.markNews(news.id),
+                onMark: () => state.mark(news.id),
-                onUnmark: () => state.unMarkNews(news.id),
+                onUnmark: () => state.unMark(news.id),
               ),
             ],
           ),