488 lines
13 KiB
Dart
488 lines
13 KiB
Dart
import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:receive_sharing_intent/receive_sharing_intent.dart';
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/// 图片网格预览组件 - 用于批量模式下显示多张图片的网格布局
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/// 支持图片预览、选择状态和错误处理
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class ImageGridPreview extends StatelessWidget {
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/// 分享的图片文件列表
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final List<SharedMediaFile> images;
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/// 选中的图片索引列表
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final List<int> selectedIndices;
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/// 图片选择状态变更回调
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final Function(int index, bool selected) onSelectionChanged;
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/// 是否显示选择框
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final bool showSelection;
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/// 网格列数
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final int crossAxisCount;
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/// 图片间距
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final double spacing;
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/// 边距
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final EdgeInsets padding;
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const ImageGridPreview({
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Key? key,
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required this.images,
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required this.selectedIndices,
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required this.onSelectionChanged,
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this.showSelection = true,
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this.crossAxisCount = 2,
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this.spacing = 8.0,
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this.padding = const EdgeInsets.all(16),
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}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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if (images.isEmpty) {
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return _buildEmptyState(context);
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}
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return Padding(
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padding: padding,
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child: GridView.builder(
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gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
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crossAxisCount: crossAxisCount,
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crossAxisSpacing: spacing,
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mainAxisSpacing: spacing,
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childAspectRatio: 1.0,
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),
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itemCount: images.length,
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itemBuilder: (context, index) => _buildImageItem(context, index),
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),
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);
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}
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/// 构建空状态
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Widget _buildEmptyState(BuildContext context) {
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return Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.photo_library_outlined,
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size: 64,
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color: Theme.of(context).colorScheme.outline,
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),
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const SizedBox(height: 16),
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Text(
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'暂无图片',
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style: Theme.of(context).textTheme.bodyLarge?.copyWith(
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color: Theme.of(context).colorScheme.outline,
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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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/// 构建单个图片项
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Widget _buildImageItem(BuildContext context, int index) {
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final imageFile = images[index];
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final isSelected = selectedIndices.contains(index);
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return GestureDetector(
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onTap: () {
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if (showSelection) {
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onSelectionChanged(index, !isSelected);
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} else {
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_showImagePreview(context, index);
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}
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},
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onLongPress: () => _showImagePreview(context, index),
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child: Container(
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(8),
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border: isSelected
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? Border.all(
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color: Theme.of(context).colorScheme.primary,
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width: 3,
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)
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: null,
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.1),
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blurRadius: 4,
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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: ClipRRect(
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borderRadius: BorderRadius.circular(5), // 稍小以避免边框溢出
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child: Stack(
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fit: StackFit.expand,
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children: [
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// 图片显示
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Image.file(
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File(imageFile.path),
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fit: BoxFit.cover,
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errorBuilder: (context, error, stackTrace) =>
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_buildErrorPlaceholder(context),
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frameBuilder: (context, child, frame, wasSynchronouslyLoaded) {
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if (frame == null) return _buildLoadingPlaceholder(context);
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return child;
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},
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),
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// 选择标记
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if (showSelection)
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Positioned(
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top: 8,
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right: 8,
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child: Container(
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width: 24,
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height: 24,
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decoration: BoxDecoration(
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color: isSelected
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? Theme.of(context).colorScheme.primary
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: Colors.white.withOpacity(0.7),
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shape: BoxShape.circle,
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border: Border.all(
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color: isSelected
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? Theme.of(context).colorScheme.primary
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: Colors.grey.withOpacity(0.5),
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width: 2,
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),
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),
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child: isSelected
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? const Icon(
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Icons.check,
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color: Colors.white,
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size: 16,
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)
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: null,
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),
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),
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// 文件类型标记
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if (_isGifImage(imageFile.path))
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Positioned(
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bottom: 8,
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left: 8,
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child: Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 6,
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vertical: 2,
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),
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.6),
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borderRadius: BorderRadius.circular(4),
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),
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child: const Text(
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'GIF',
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style: TextStyle(
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color: Colors.white,
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fontSize: 10,
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fontWeight: FontWeight.bold,
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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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/// 构建加载中的占位符
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Widget _buildLoadingPlaceholder(BuildContext context) {
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return Container(
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color: Colors.grey[200],
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child: Center(
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child: CircularProgressIndicator(
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strokeWidth: 2,
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valueColor: AlwaysStoppedAnimation<Color>(
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Theme.of(context).colorScheme.primary,
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),
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),
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),
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);
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}
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/// 构建错误占位符
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Widget _buildErrorPlaceholder(BuildContext context) {
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return Container(
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color: Colors.grey[200],
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.broken_image,
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size: 32,
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color: Colors.grey[400],
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),
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const SizedBox(height: 4),
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Text(
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'加载失败',
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style: TextStyle(
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color: Colors.grey[600],
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fontSize: 12,
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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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/// 显示图片预览
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void _showImagePreview(BuildContext context, int index) {
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Navigator.of(context).push(
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PageRouteBuilder<void>(
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pageBuilder: (context, animation, secondaryAnimation) =>
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ImagePreviewPage(
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images: images,
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initialIndex: index,
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),
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transitionsBuilder: (context, animation, secondaryAnimation, child) {
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return FadeTransition(
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opacity: animation,
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child: child,
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);
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},
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),
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);
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}
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/// 检查是否为GIF图片
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bool _isGifImage(String path) {
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return path.toLowerCase().endsWith('.gif');
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}
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}
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/// 图片预览页面 - 全屏显示单张图片
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class ImagePreviewPage extends StatefulWidget {
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/// 图片文件列表
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final List<SharedMediaFile> images;
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/// 初始显示的图片索引
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final int initialIndex;
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const ImagePreviewPage({
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Key? key,
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required this.images,
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required this.initialIndex,
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}) : super(key: key);
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@override
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State<ImagePreviewPage> createState() => _ImagePreviewPageState();
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}
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class _ImagePreviewPageState extends State<ImagePreviewPage>
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with SingleTickerProviderStateMixin {
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late PageController _pageController;
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late AnimationController _animationController;
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late Animation<double> _fadeAnimation;
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/// 当前显示的图片索引
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int currentIndex = 0;
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@override
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void initState() {
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super.initState();
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currentIndex = widget.initialIndex;
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_pageController = PageController(initialPage: currentIndex);
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// 动画控制器
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_animationController = AnimationController(
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duration: const Duration(milliseconds: 300),
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vsync: this,
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);
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_fadeAnimation = Tween<double>(
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begin: 0.0,
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end: 1.0,
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).animate(CurvedAnimation(
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parent: _animationController,
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curve: Curves.easeInOut,
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));
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// 延迟显示UI控件
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Future.delayed(const Duration(milliseconds: 500), () {
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if (mounted) {
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_animationController.forward();
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}
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});
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}
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@override
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void dispose() {
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_pageController.dispose();
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_animationController.dispose();
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super.dispose();
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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: Colors.black,
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body: Stack(
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children: [
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// 图片显示区域
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PageView.builder(
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controller: _pageController,
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itemCount: widget.images.length,
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onPageChanged: (index) {
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setState(() {
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currentIndex = index;
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});
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},
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itemBuilder: (context, index) => _buildFullImage(context, index),
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),
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// 顶部工具栏
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FadeTransition(
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opacity: _fadeAnimation,
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child: _buildTopToolbar(),
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),
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// 底部指示器
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FadeTransition(
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opacity: _fadeAnimation,
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child: _buildBottomIndicator(),
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),
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],
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),
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);
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}
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/// 构建全屏图片
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Widget _buildFullImage(BuildContext context, int index) {
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final imageFile = widget.images[index];
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return InteractiveViewer(
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panEnabled: true,
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boundaryMargin: const EdgeInsets.all(20),
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minScale: 0.5,
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maxScale: 4.0,
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child: Image.file(
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File(imageFile.path),
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fit: BoxFit.contain,
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errorBuilder: (context, error, stackTrace) => _buildErrorView(),
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),
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);
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}
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/// 构建错误视图
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Widget _buildErrorView() {
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return Center(
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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.broken_image,
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size: 64,
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color: Colors.white54,
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),
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const SizedBox(height: 16),
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Text(
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'图片加载失败',
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style: TextStyle(
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color: Colors.white54,
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fontSize: 16,
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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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/// 构建顶部工具栏
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Widget _buildTopToolbar() {
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return Positioned(
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top: 0,
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left: 0,
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right: 0,
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child: Container(
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height: MediaQuery.of(context).padding.top + 56,
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.black.withOpacity(0.7),
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Colors.transparent,
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],
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),
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),
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padding: EdgeInsets.only(
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top: MediaQuery.of(context).padding.top,
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left: 16,
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right: 16,
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),
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child: Row(
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children: [
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// 返回按钮
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IconButton(
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onPressed: () => Navigator.of(context).pop(),
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icon: const Icon(
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Icons.arrow_back,
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color: Colors.white,
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),
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),
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const Spacer(),
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// 图片信息
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if (_isGifImage(widget.images[currentIndex].path))
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Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 8,
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vertical: 4,
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),
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decoration: BoxDecoration(
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color: Colors.white.withOpacity(0.2),
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borderRadius: BorderRadius.circular(12),
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),
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child: const Text(
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'GIF',
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style: TextStyle(
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color: Colors.white,
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fontSize: 12,
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fontWeight: FontWeight.bold,
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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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/// 构建底部指示器
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Widget _buildBottomIndicator() {
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return Positioned(
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bottom: MediaQuery.of(context).padding.bottom + 16,
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left: 0,
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right: 0,
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child: Center(
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child: Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 12,
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vertical: 6,
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),
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.5),
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borderRadius: BorderRadius.circular(16),
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),
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child: Text(
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'${currentIndex + 1} / ${widget.images.length}',
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style: const TextStyle(
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color: Colors.white,
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fontSize: 14,
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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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/// 检查是否为GIF图片
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bool _isGifImage(String path) {
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return path.toLowerCase().endsWith('.gif');
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}
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} |