commit 559072c8d8b3e45fe9b639bf898e3ac6c508c09d · bretton.dev/coves-mobile

+518
lib/screens/compose/community_picker_screen.dart
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       import 'dart:async';

     

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       import 'package:cached_network_image/cached_network_image.dart';

     

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       import 'package:flutter/material.dart';

     

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       import 'package:provider/provider.dart';

     

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       import '../../constants/app_colors.dart';

     

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       import '../../models/community.dart';

     

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       import '../../providers/auth_provider.dart';

     

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       import '../../services/api_exceptions.dart';

     

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       import '../../services/coves_api_service.dart';

     

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       /// Community Picker Screen

     

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       ///

     

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       /// Full-screen interface for selecting a community when creating a post.

     

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       ///

     

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       /// Features:

     

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       /// - Search bar with 300ms debounce for client-side filtering

     

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       /// - Scroll pagination - loads more communities when near bottom

     

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       /// - Loading, error, and empty states

     

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       /// - Returns selected community on tap via Navigator.pop

     

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       ///

     

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       /// Design:

     

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       /// - Header: "Post to" with X close button

     

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       /// - Search bar: "Search for a community" with search icon

     

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       /// - List of communities showing:

     

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       ///   - Avatar (CircleAvatar with first letter fallback)

     

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       ///   - Community name (bold)

     

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       ///   - Member count + optional description

     

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       class CommunityPickerScreen extends StatefulWidget {

     

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         const CommunityPickerScreen({super.key});

     

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         @override

     

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         State<CommunityPickerScreen> createState() => _CommunityPickerScreenState();

     

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       }

     

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       class _CommunityPickerScreenState extends State<CommunityPickerScreen> {

     

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         final TextEditingController _searchController = TextEditingController();

     

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         final ScrollController _scrollController = ScrollController();

     

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         List<CommunityView> _communities = [];

     

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         List<CommunityView> _filteredCommunities = [];

     

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         bool _isLoading = false;

     

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         bool _isLoadingMore = false;

     

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         String? _error;

     

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         String? _cursor;

     

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         bool _hasMore = true;

     

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         Timer? _searchDebounce;

     

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         CovesApiService? _apiService;

     

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         @override

     

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         void initState() {

     

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           super.initState();

     

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           _searchController.addListener(_onSearchChanged);

     

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           _scrollController.addListener(_onScroll);

     

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           // Defer API initialization to first frame to access context

     

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           WidgetsBinding.instance.addPostFrameCallback((_) {

     

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             _initApiService();

     

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             _loadCommunities();

     

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           });

     

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         }

     

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         void _initApiService() {

     

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           final authProvider = context.read<AuthProvider>();

     

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           _apiService = CovesApiService(

     

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             tokenGetter: authProvider.getAccessToken,

     

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             tokenRefresher: authProvider.refreshToken,

     

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             signOutHandler: authProvider.signOut,

     

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           );

     

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         }

     

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         @override

     

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         void dispose() {

     

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           _searchController.dispose();

     

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           _scrollController.dispose();

     

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           _searchDebounce?.cancel();

     

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           _apiService?.dispose();

     

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           super.dispose();

     

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         }

     

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         void _onSearchChanged() {

     

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           // Cancel previous debounce timer

     

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           _searchDebounce?.cancel();

     

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           // Start new debounce timer (300ms)

     

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           _searchDebounce = Timer(const Duration(milliseconds: 300), _filterCommunities);

     

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         }

     

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         void _filterCommunities() {

     

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           final query = _searchController.text.trim().toLowerCase();

     

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           if (query.isEmpty) {

     

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             setState(() {

     

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               _filteredCommunities = _communities;

     

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             });

     

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             return;

     

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           }

     

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           setState(() {

     

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             _filteredCommunities = _communities.where((community) {

     

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               final name = community.name.toLowerCase();

     

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               final displayName = community.displayName?.toLowerCase() ?? '';

     

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               final description = community.description?.toLowerCase() ?? '';

     

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               return name.contains(query) ||

     

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                   displayName.contains(query) ||

     

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                   description.contains(query);

     

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             }).toList();

     

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           });

     

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         }

     

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         void _onScroll() {

     

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           // Load more when near bottom (80% scrolled)

     

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           if (_scrollController.position.pixels >=

     

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               _scrollController.position.maxScrollExtent * 0.8) {

     

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             if (!_isLoadingMore && _hasMore && !_isLoading) {

     

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               _loadMoreCommunities();

     

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             }

     

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           }

     

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         }

     

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         Future<void> _loadCommunities() async {

     

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           if (_isLoading || _apiService == null) {

     

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             return;

     

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           }

     

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           setState(() {

     

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             _isLoading = true;

     

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             _error = null;

     

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           });

     

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           try {

     

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             final response = await _apiService!.listCommunities(

     

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               limit: 50,

     

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             );

     

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             if (mounted) {

     

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               setState(() {

     

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                 _communities = response.communities;

     

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                 _filteredCommunities = response.communities;

     

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                 _cursor = response.cursor;

     

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                 _hasMore = response.cursor != null && response.cursor!.isNotEmpty;

     

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                 _isLoading = false;

     

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               });

     

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             }

     

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           } on ApiException catch (e) {

     

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             if (mounted) {

     

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               setState(() {

     

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                 _error = e.message;

     

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                 _isLoading = false;

     

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               });

     

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             }

     

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           } on Exception catch (e) {

     

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             if (mounted) {

     

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               setState(() {

     

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                 _error = 'Failed to load communities: ${e.toString()}';

     

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                 _isLoading = false;

     

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               });

     

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             }

     

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           }

     

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         }

     

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         Future<void> _loadMoreCommunities() async {

     

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           if (_isLoadingMore || !_hasMore || _cursor == null || _apiService == null) {

     

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             return;

     

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           }

     

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           setState(() {

     

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             _isLoadingMore = true;

     

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           });

     

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           try {

     

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             final response = await _apiService!.listCommunities(

     

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               limit: 50,

     

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               cursor: _cursor,

     

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             );

     

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             if (mounted) {

     

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               setState(() {

     

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                 _communities.addAll(response.communities);

     

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                 _cursor = response.cursor;

     

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                 _hasMore = response.cursor != null && response.cursor!.isNotEmpty;

     

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                 _isLoadingMore = false;

     

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                 // Re-apply search filter if active

     

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                 _filterCommunities();

     

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               });

     

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             }

     

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           } on ApiException catch (e) {

     

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             if (mounted) {

     

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               setState(() {

     

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                 _error = e.message;

     

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                 _isLoadingMore = false;

     

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               });

     

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             }

     

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           } on Exception {

     

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             if (mounted) {

     

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               setState(() {

     

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                 _isLoadingMore = false;

     

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               });

     

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             }

     

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           }

     

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         }

     

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         void _onCommunityTap(CommunityView community) {

     

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           Navigator.pop(context, community);

     

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         }

     

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         @override

     

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         Widget build(BuildContext context) {

     

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           return Scaffold(

     

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             backgroundColor: AppColors.background,

     

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             appBar: AppBar(

     

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               backgroundColor: AppColors.background,

     

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               foregroundColor: Colors.white,

     

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               title: const Text('Post to'),

     

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               elevation: 0,

     

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               leading: IconButton(

     

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                 icon: const Icon(Icons.close),

     

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                 onPressed: () => Navigator.pop(context),

     

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               ),

     

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             ),

     

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             body: SafeArea(

     

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               child: Column(

     

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                 children: [

     

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                   // Search bar

     

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                   Padding(

     

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                     padding: const EdgeInsets.all(16),

     

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                     child: TextField(

     

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                       controller: _searchController,

     

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                       style: const TextStyle(color: Colors.white),

     

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                       decoration: InputDecoration(

     

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                         hintText: 'Search for a community',

     

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                         hintStyle: const TextStyle(color: Color(0xFF5A6B7F)),

     

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                         filled: true,

     

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                         fillColor: const Color(0xFF1A2028),

     

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                         border: OutlineInputBorder(

     

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                           borderRadius: BorderRadius.circular(12),

     

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                           borderSide: BorderSide.none,

     

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                         ),

     

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                         enabledBorder: OutlineInputBorder(

     

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                           borderRadius: BorderRadius.circular(12),

     

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                           borderSide: BorderSide.none,

     

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                         ),

     

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                         focusedBorder: OutlineInputBorder(

     

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                           borderRadius: BorderRadius.circular(12),

     

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                           borderSide: const BorderSide(

     

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                             color: AppColors.primary,

     

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                             width: 2,

     

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                           ),

     

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                         ),

     

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                         prefixIcon: const Icon(

     

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                           Icons.search,

     

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                           color: Color(0xFF5A6B7F),

     

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                         ),

     

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                         contentPadding: const EdgeInsets.symmetric(

     

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                           horizontal: 16,

     

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                           vertical: 12,

     

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                         ),

     

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                       ),

     

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                     ),

     

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                   ),

     

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                   // Community list

     

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                   Expanded(

     

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                     child: _buildBody(),

     

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                   ),

     

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                 ],

     

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               ),

     

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             ),

     

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           );

     

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         }

     

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         Widget _buildBody() {

     

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           // Loading state (initial load)

     

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           if (_isLoading) {

     

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             return const Center(

     

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               child: CircularProgressIndicator(

     

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                 color: AppColors.primary,

     

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               ),

     

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             );

     

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           }

     

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           // Error state

     

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           if (_error != null) {

     

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             return Center(

     

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               child: Padding(

     

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                 padding: const EdgeInsets.all(24),

     

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                 child: Column(

     

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                   mainAxisAlignment: MainAxisAlignment.center,

     

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                   children: [

     

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                     const Icon(

     

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                       Icons.error_outline,

     

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                       size: 48,

     

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                       color: Color(0xFF5A6B7F),

     

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                     ),

     

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                     const SizedBox(height: 16),

     

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                     Text(

     

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                       _error!,

     

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                       style: const TextStyle(

     

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                         color: Color(0xFFB6C2D2),

     

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                         fontSize: 16,

     

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                       ),

     

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                       textAlign: TextAlign.center,

     

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                     ),

     

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                     const SizedBox(height: 24),

     

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                     ElevatedButton(

     

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                       onPressed: _loadCommunities,

     

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                       style: ElevatedButton.styleFrom(

     

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                         backgroundColor: AppColors.primary,

     

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                         foregroundColor: Colors.white,

     

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                         padding: const EdgeInsets.symmetric(

     

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                           horizontal: 24,

     

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                           vertical: 12,

     

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                         ),

     

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                         shape: RoundedRectangleBorder(

     

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                           borderRadius: BorderRadius.circular(8),

     

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                         ),

     

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                       ),

     

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                       child: const Text('Retry'),

     

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                     ),

     

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                   ],

     

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                 ),

     

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               ),

     

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             );

     

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           }

     

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       +
       

     

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           // Empty state

     

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           if (_filteredCommunities.isEmpty) {

     

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             return Center(

     

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               child: Padding(

     

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                 padding: const EdgeInsets.all(24),

     

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                 child: Column(

     

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                   mainAxisAlignment: MainAxisAlignment.center,

     

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                   children: [

     

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                     const Icon(

     

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                       Icons.search_off,

     

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                       size: 48,

     

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                       color: Color(0xFF5A6B7F),

     

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       +
                     ),

     

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                     const SizedBox(height: 16),

     

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                     Text(

     

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                       _searchController.text.trim().isEmpty

     

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                           ? 'No communities found'

     

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                           : 'No communities match your search',

     

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                       style: const TextStyle(

     

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                         color: Color(0xFFB6C2D2),

     

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       +
                         fontSize: 16,

     

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                       ),

     

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                       textAlign: TextAlign.center,

     

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                     ),

     

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                   ],

     

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                 ),

     

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               ),

     

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             );

     

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           }

     

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       +
       

     

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           // Community list

     

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           return ListView.builder(

     

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       360
       +
             controller: _scrollController,

     

       361
       361
       +
             itemCount: _filteredCommunities.length + (_isLoadingMore ? 1 : 0),

     

       362
       362
       +
             itemBuilder: (context, index) {

     

       363
       363
       +
               // Loading indicator at bottom

     

       364
       364
       +
               if (index == _filteredCommunities.length) {

     

       365
       365
       +
                 return const Padding(

     

       366
       366
       +
                   padding: EdgeInsets.all(16),

     

       367
       367
       +
                   child: Center(

     

       368
       368
       +
                     child: CircularProgressIndicator(

     

       369
       369
       +
                       color: AppColors.primary,

     

       370
       370
       +
                     ),

     

       371
       371
       +
                   ),

     

       372
       372
       +
                 );

     

       373
       373
       +
               }

     

       374
       374
       +
       

     

       375
       375
       +
               final community = _filteredCommunities[index];

     

       376
       376
       +
               return _buildCommunityTile(community);

     

       377
       377
       +
             },

     

       378
       378
       +
           );

     

       379
       379
       +
         }

     

       380
       380
       +
       

     

       381
       381
       +
         Widget _buildCommunityAvatar(CommunityView community) {

     

       382
       382
       +
           final fallbackChild = CircleAvatar(

     

       383
       383
       +
             radius: 20,

     

       384
       384
       +
             backgroundColor: AppColors.backgroundSecondary,

     

       385
       385
       +
             foregroundColor: Colors.white,

     

       386
       386
       +
             child: Text(

     

       387
       387
       +
               community.name.isNotEmpty ? community.name[0].toUpperCase() : '?',

     

       388
       388
       +
               style: const TextStyle(

     

       389
       389
       +
                 fontSize: 16,

     

       390
       390
       +
                 fontWeight: FontWeight.bold,

     

       391
       391
       +
               ),

     

       392
       392
       +
             ),

     

       393
       393
       +
           );

     

       394
       394
       +
       

     

       395
       395
       +
           if (community.avatar == null) {

     

       396
       396
       +
             return fallbackChild;

     

       397
       397
       +
           }

     

       398
       398
       +
       

     

       399
       399
       +
           return CachedNetworkImage(

     

       400
       400
       +
             imageUrl: community.avatar!,

     

       401
       401
       +
             imageBuilder: (context, imageProvider) => CircleAvatar(

     

       402
       402
       +
               radius: 20,

     

       403
       403
       +
               backgroundColor: AppColors.backgroundSecondary,

     

       404
       404
       +
               backgroundImage: imageProvider,

     

       405
       405
       +
             ),

     

       406
       406
       +
             placeholder: (context, url) => CircleAvatar(

     

       407
       407
       +
               radius: 20,

     

       408
       408
       +
               backgroundColor: AppColors.backgroundSecondary,

     

       409
       409
       +
               child: const SizedBox(

     

       410
       410
       +
                 width: 16,

     

       411
       411
       +
                 height: 16,

     

       412
       412
       +
                 child: CircularProgressIndicator(

     

       413
       413
       +
                   strokeWidth: 2,

     

       414
       414
       +
                   color: AppColors.primary,

     

       415
       415
       +
                 ),

     

       416
       416
       +
               ),

     

       417
       417
       +
             ),

     

       418
       418
       +
             errorWidget: (context, url, error) => fallbackChild,

     

       419
       419
       +
           );

     

       420
       420
       +
         }

     

       421
       421
       +
       

     

       422
       422
       +
         Widget _buildCommunityTile(CommunityView community) {

     

       423
       423
       +
           // Format member count

     

       424
       424
       +
           String formatCount(int? count) {

     

       425
       425
       +
             if (count == null) {

     

       426
       426
       +
               return '0';

     

       427
       427
       +
             }

     

       428
       428
       +
             if (count >= 1000000) {

     

       429
       429
       +
               return '${(count / 1000000).toStringAsFixed(1)}M';

     

       430
       430
       +
             } else if (count >= 1000) {

     

       431
       431
       +
               return '${(count / 1000).toStringAsFixed(1)}K';

     

       432
       432
       +
             }

     

       433
       433
       +
             return count.toString();

     

       434
       434
       +
           }

     

       435
       435
       +
       

     

       436
       436
       +
           final memberCount = formatCount(community.memberCount);

     

       437
       437
       +
           final subscriberCount = formatCount(community.subscriberCount);

     

       438
       438
       +
       

     

       439
       439
       +
           // Build description line

     

       440
       440
       +
           var descriptionLine = '';

     

       441
       441
       +
           if (community.memberCount != null && community.memberCount! > 0) {

     

       442
       442
       +
             descriptionLine = '$memberCount members';

     

       443
       443
       +
             if (community.subscriberCount != null &&

     

       444
       444
       +
                 community.subscriberCount! > 0) {

     

       445
       445
       +
               descriptionLine += ' · $subscriberCount subscribers';

     

       446
       446
       +
             }

     

       447
       447
       +
           } else if (community.subscriberCount != null &&

     

       448
       448
       +
               community.subscriberCount! > 0) {

     

       449
       449
       +
             descriptionLine = '$subscriberCount subscribers';

     

       450
       450
       +
           }

     

       451
       451
       +
       

     

       452
       452
       +
           if (community.description != null && community.description!.isNotEmpty) {

     

       453
       453
       +
             if (descriptionLine.isNotEmpty) {

     

       454
       454
       +
               descriptionLine += ' · ';

     

       455
       455
       +
             }

     

       456
       456
       +
             descriptionLine += community.description!;

     

       457
       457
       +
           }

     

       458
       458
       +
       

     

       459
       459
       +
           return Material(

     

       460
       460
       +
             color: Colors.transparent,

     

       461
       461
       +
             child: InkWell(

     

       462
       462
       +
               onTap: () => _onCommunityTap(community),

     

       463
       463
       +
               child: Container(

     

       464
       464
       +
                 padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),

     

       465
       465
       +
                 decoration: const BoxDecoration(

     

       466
       466
       +
                   border: Border(

     

       467
       467
       +
                     bottom: BorderSide(

     

       468
       468
       +
                       color: Color(0xFF2A3441),

     

       469
       469
       +
                       width: 1,

     

       470
       470
       +
                     ),

     

       471
       471
       +
                   ),

     

       472
       472
       +
                 ),

     

       473
       473
       +
                 child: Row(

     

       474
       474
       +
                   children: [

     

       475
       475
       +
                     // Avatar

     

       476
       476
       +
                     _buildCommunityAvatar(community),

     

       477
       477
       +
                     const SizedBox(width: 12),

     

       478
       478
       +
       

     

       479
       479
       +
                     // Community info

     

       480
       480
       +
                     Expanded(

     

       481
       481
       +
                       child: Column(

     

       482
       482
       +
                         crossAxisAlignment: CrossAxisAlignment.start,

     

       483
       483
       +
                         children: [

     

       484
       484
       +
                           // Community name

     

       485
       485
       +
                           Text(

     

       486
       486
       +
                             community.displayName ?? community.name,

     

       487
       487
       +
                             style: const TextStyle(

     

       488
       488
       +
                               color: Colors.white,

     

       489
       489
       +
                               fontSize: 16,

     

       490
       490
       +
                               fontWeight: FontWeight.bold,

     

       491
       491
       +
                             ),

     

       492
       492
       +
                             maxLines: 1,

     

       493
       493
       +
                             overflow: TextOverflow.ellipsis,

     

       494
       494
       +
                           ),

     

       495
       495
       +
       

     

       496
       496
       +
                           // Description line

     

       497
       497
       +
                           if (descriptionLine.isNotEmpty) ...[

     

       498
       498
       +
                             const SizedBox(height: 4),

     

       499
       499
       +
                             Text(

     

       500
       500
       +
                               descriptionLine,

     

       501
       501
       +
                               style: const TextStyle(

     

       502
       502
       +
                                 color: Color(0xFFB6C2D2),

     

       503
       503
       +
                                 fontSize: 14,

     

       504
       504
       +
                               ),

     

       505
       505
       +
                               maxLines: 2,

     

       506
       506
       +
                               overflow: TextOverflow.ellipsis,

     

       507
       507
       +
                             ),

     

       508
       508
       +
                           ],

     

       509
       509
       +
                         ],

     

       510
       510
       +
                       ),

     

       511
       511
       +
                     ),

     

       512
       512
       +
                   ],

     

       513
       513
       +
                 ),

     

       514
       514
       +
               ),

     

       515
       515
       +
             ),

     

       516
       516
       +
           );

     

       517
       517
       +
         }

     

       518
       518
       +
       }