generated from dellevin/template
相册功能优化
This commit is contained in:
DelLevin-Home
195
lib/pages/explore/gallery_page.dart
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195
lib/pages/explore/gallery_page.dart
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import 'package:flutter/material.dart';
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import '../../data/gallery/gallery_dao.dart';
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import '../../models/data_models.dart';
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import '../../widgets/fade_in_local_image.dart';
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import 'gallery_viewer_page.dart';
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/// 类别显示名映射
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const _categoryLabels = {
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'movie_poster': '影视海报',
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'movie_posters': '海报墙',
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'book_cover': '书籍封面',
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'note_image': '笔记图片',
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'game_cover': '游戏封面',
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'game_screenshot': '游戏截图',
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'person_photo': '人物照片',
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'movie_character': '影视角色',
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'book_character': '书籍角色',
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'game_character': '游戏角色',
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};
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class GalleryPage extends StatefulWidget {
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const GalleryPage({super.key});
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@override
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State<GalleryPage> createState() => _GalleryPageState();
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}
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class _GalleryPageState extends State<GalleryPage> {
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final GalleryDao _dao = GalleryDao();
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List<GalleryItem> _allItems = [];
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bool _loading = true;
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String? _error;
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String? _selectedCategory; // null = 全部
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bool _descending = true; // 按时间倒序
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@override
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void initState() {
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super.initState();
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_loadImages();
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}
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Future<void> _loadImages() async {
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try {
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final items = await _dao.getAllImages();
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if (!mounted) return;
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setState(() {
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_allItems = items;
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_loading = false;
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});
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} catch (e) {
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if (!mounted) return;
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setState(() {
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_error = '加载失败：$e';
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_loading = false;
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});
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}
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}
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List<GalleryItem> get _filteredItems {
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var items = _allItems;
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if (_selectedCategory != null) {
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items = items.where((i) => i.category == _selectedCategory).toList();
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}
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if (!_descending) {
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items = items.reversed.toList();
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}
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return items;
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}
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List<String> get _availableCategories {
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final set = _allItems.map((i) => i.category).toSet();
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// 按预定义顺序排列
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return _categoryLabels.keys.where((k) => set.contains(k)).toList();
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}
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void _openPreview(int index) {
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final items = _filteredItems;
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (_) => GalleryViewerPage(items: items, initialIndex: index),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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final colors = Theme.of(context).colorScheme;
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return Scaffold(
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appBar: AppBar(
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title: const Text('图库'),
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actions: [
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if (!_loading && _allItems.isNotEmpty)
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IconButton(
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icon: Icon(_descending ? Icons.arrow_downward : Icons.arrow_upward, size: 20),
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tooltip: _descending ? '当前：最新在前' : '当前：最早在前',
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onPressed: () => setState(() => _descending = !_descending),
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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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: _error != null
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? Center(
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child: Padding(
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padding: const EdgeInsets.all(24),
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child: Text(_error!, textAlign: TextAlign.center, style: TextStyle(color: colors.error)),
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),
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)
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: _allItems.isEmpty
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? Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(Icons.photo_library_outlined, size: 64, color: colors.onSurface.withValues(alpha: 0.2)),
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const SizedBox(height: 12),
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Text('还没有保存过图片', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.5))),
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],
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),
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)
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: Column(
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children: [
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// 类别筛选条
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if (_availableCategories.length > 1)
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SizedBox(
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height: 44,
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child: ListView(
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scrollDirection: Axis.horizontal,
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
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children: [
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_buildChip(null, '全部', colors),
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..._availableCategories.map((c) => _buildChip(c, _categoryLabels[c] ?? c, colors)),
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],
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),
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),
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// 网格
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Expanded(
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child: GridView.builder(
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padding: const EdgeInsets.all(4),
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gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
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crossAxisCount: 3,
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crossAxisSpacing: 4,
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mainAxisSpacing: 4,
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),
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itemCount: _filteredItems.length,
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itemBuilder: (context, index) {
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final item = _filteredItems[index];
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return GestureDetector(
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onTap: () => _openPreview(index),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(8),
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child: FadeInLocalImage(
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path: item.path,
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fit: BoxFit.cover,
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errorWidget: Container(
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color: colors.surfaceContainerHighest,
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child: Icon(Icons.broken_image_outlined, color: colors.onSurface.withValues(alpha: 0.3)),
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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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// 底部计数
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SafeArea(
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top: false,
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child: Padding(
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padding: const EdgeInsets.symmetric(vertical: 8),
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child: Text(
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'共 ${_filteredItems.length} 张图片',
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style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.5)),
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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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Widget _buildChip(String? category, String label, ColorScheme colors) {
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final selected = _selectedCategory == category;
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return Padding(
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padding: const EdgeInsets.only(right: 8),
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child: FilterChip(
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label: Text(label),
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selected: selected,
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onSelected: (_) => setState(() => _selectedCategory = selected ? null : category),
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showCheckmark: false,
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padding: const EdgeInsets.symmetric(horizontal: 4),
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),
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);
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}
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}
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