336 lines
12 KiB
Dart
336 lines
12 KiB
Dart
import 'package:flutter/material.dart';
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import "package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart";
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import '../models/activity.dart';
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import '../services/activity_service.dart';
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import '../utils/constants.dart';
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import 'activity_detail_screen.dart';
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import 'create_activity_screen.dart';
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class HomeScreen extends StatefulWidget {
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const HomeScreen({super.key});
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@override
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State<HomeScreen> createState() => _HomeScreenState();
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}
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class _HomeScreenState extends State<HomeScreen> {
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String _selectedCategory = '全部';
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String _timeFilter = '全部';
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List<Activity> _activities = [];
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bool _loading = true;
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@override
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void initState() {
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super.initState();
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_loadActivities();
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}
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void _loadActivities() {
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setState(() {
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_activities = ActivityService.getMockActivities();
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_loading = false;
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});
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}
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List<Activity> get _filteredActivities {
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return _activities.where((a) {
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if (_selectedCategory != '全部' && a.category != _selectedCategory) return false;
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if (_timeFilter == '今天') {
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return DateUtils.isSameDay(a.time, DateTime.now());
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}
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if (_timeFilter == '明天') {
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final tomorrow = DateTime.now().add(const Duration(days: 1));
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return DateUtils.isSameDay(a.time, tomorrow);
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}
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return true;
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}).toList();
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}
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@override
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Widget build(BuildContext context) {
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final filteredActivities = _filteredActivities;
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return Scaffold(
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appBar: AppBar(
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title: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.location_on, size: 18, color: Color(0xFF1976D2)),
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const SizedBox(width: 4),
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const Text(
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'成都',
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style: TextStyle(fontSize: 16, color: Color(0xFF666666)),
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),
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const SizedBox(width: 16),
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Expanded(
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child: Container(
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height: 36,
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decoration: BoxDecoration(
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color: const Color(0xFFF5F5F5),
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borderRadius: BorderRadius.circular(18),
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),
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child: const Row(
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children: [
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SizedBox(width: 12),
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Icon(Icons.search, size: 20, color: Color(0xFF999999)),
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SizedBox(width: 8),
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Text(
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'搜索活动',
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style: TextStyle(fontSize: 14, color: Color(0xFF999999)),
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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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),
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body: _loading
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? const Center(child: CircularProgressIndicator())
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: RefreshIndicator(
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onRefresh: () async => _loadActivities(),
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child: CustomScrollView(
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slivers: [
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SliverList(
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delegate: SliverChildListDelegate([
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SizedBox(
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height: 48,
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child: ListView(
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scrollDirection: Axis.horizontal,
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padding: const EdgeInsets.symmetric(horizontal: 16),
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children: AppConstants.activityCategories.map((cat) {
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final selected = _selectedCategory == cat;
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return Padding(
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padding: const EdgeInsets.only(right: 8),
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child: ChoiceChip(
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label: Text(
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cat,
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style: TextStyle(
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fontSize: 14,
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color:
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selected
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? Colors.white
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: const Color(0xFF666666),
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),
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),
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selected: selected,
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selectedColor: const Color(0xFF1976D2),
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backgroundColor: const Color(0xFFF5F5F5),
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onSelected: (_) => setState(() => _selectedCategory = cat),
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),
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);
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}).toList(),
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),
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),
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
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child: Row(
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children: ['全部', '今天', '明天', '本周'].map((t) {
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final selected = _timeFilter == t;
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return Padding(
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padding: const EdgeInsets.only(right: 12),
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child: GestureDetector(
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onTap: () => setState(() => _timeFilter = t),
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child: Text(
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t,
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style: TextStyle(
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fontSize: 16,
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color:
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selected
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? const Color(0xFF1976D2)
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: const Color(0xFF999999),
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fontWeight:
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selected
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? FontWeight.w600
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: FontWeight.normal,
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),
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),
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),
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);
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}).toList(),
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),
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),
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]),
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),
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SliverPadding(
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padding: const EdgeInsets.all(12),
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sliver: SliverMasonryGrid.count(
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crossAxisCount: 2,
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mainAxisSpacing: 10,
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crossAxisSpacing: 10,
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childCount: filteredActivities.length,
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itemBuilder: (ctx, i) => _ActivityCard(
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key: ValueKey(filteredActivities[i].id),
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activity: filteredActivities[i],
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onTap:
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() => Navigator.push(
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context,
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MaterialPageRoute(
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builder:
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(_) => ActivityDetailScreen(
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activity: filteredActivities[i],
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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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const SliverToBoxAdapter(child: SizedBox(height: 80)),
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],
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),
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),
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floatingActionButton: FloatingActionButton.extended(
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onPressed:
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() => Navigator.push(
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context,
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MaterialPageRoute(builder: (_) => const CreateActivityScreen()),
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),
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icon: const Icon(Icons.add),
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label: const Text('发起活动', style: TextStyle(fontSize: 16)),
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backgroundColor: const Color(0xFF1976D2),
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foregroundColor: Colors.white,
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),
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);
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}
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}
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class _ActivityCard extends StatefulWidget {
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final Activity activity;
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final VoidCallback onTap;
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const _ActivityCard({
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super.key,
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required this.activity,
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required this.onTap,
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});
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@override
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State<_ActivityCard> createState() => _ActivityCardState();
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}
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class _ActivityCardState extends State<_ActivityCard> {
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bool _isJoined = false;
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void _joinActivity() {
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setState(() => _isJoined = true);
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ScaffoldMessenger.of(context)
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..hideCurrentSnackBar()
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..showSnackBar(const SnackBar(content: Text("报名成功！")));
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}
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@override
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Widget build(BuildContext context) {
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final activity = widget.activity;
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final canJoin = !activity.isFull && !_isJoined;
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final imageHeight = activity.id.hashCode.isOdd ? 160.0 : 210.0;
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return Material(
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color: Colors.transparent,
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child: Ink(
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(12),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.06),
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blurRadius: 6,
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offset: const Offset(0, 2),
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),
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],
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),
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child: InkWell(
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onTap: widget.onTap,
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borderRadius: BorderRadius.circular(12),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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ClipRRect(
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borderRadius: const BorderRadius.only(
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topLeft: Radius.circular(12),
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topRight: Radius.circular(12),
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),
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child: Image.network(
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"https://picsum.photos/seed/${activity.title.hashCode.abs()}/400/300",
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height: imageHeight,
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width: double.infinity,
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fit: BoxFit.cover,
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errorBuilder: (_, __, ___) => Container(
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height: imageHeight,
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color: const Color(0xFFE0E0E0),
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),
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),
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),
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Padding(
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padding: const EdgeInsets.all(8),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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activity.title,
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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style: const TextStyle(
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fontSize: 14,
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fontWeight: FontWeight.w700,
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color: Color(0xFF333333),
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),
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),
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const SizedBox(height: 4),
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Row(
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children: [
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CircleAvatar(
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radius: 10,
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backgroundImage: NetworkImage(
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"https://i.pravatar.cc/40?img=${activity.category.hashCode.abs() % 40 + 1}",
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),
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),
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const SizedBox(width: 4),
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Text(
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activity.category,
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style: const TextStyle(
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fontSize: 12,
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color: Color(0xFF999999),
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),
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),
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const Spacer(),
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Text(
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"${activity.currentParticipants}人",
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style: const TextStyle(
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fontSize: 12,
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color: Color(0xFFFF6B35),
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),
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),
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],
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),
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const SizedBox(height: 8),
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SizedBox(
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width: double.infinity,
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child: ElevatedButton(
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onPressed: canJoin ? _joinActivity : null,
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style: ElevatedButton.styleFrom(
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minimumSize: const Size.fromHeight(36),
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backgroundColor: const Color(0xFF1976D2),
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foregroundColor: Colors.white,
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disabledBackgroundColor: const Color(0xFFE0E0E0),
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disabledForegroundColor: const Color(0xFF999999),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(8),
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),
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textStyle: const TextStyle(
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fontSize: 13,
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fontWeight: FontWeight.w600,
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),
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padding: EdgeInsets.zero,
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),
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child: Text(
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_isJoined ? "已报名" : activity.isFull ? "已满员" : "报名",
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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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),
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),
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),
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);
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}
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}
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