115 lines
3.4 KiB
Dart
115 lines
3.4 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:photo_view/photo_view.dart';
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import 'package:photo_view/photo_view_gallery.dart';
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class ImagePreviewPage extends StatefulWidget {
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final List<String> images;
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final int initialIndex;
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const ImagePreviewPage({
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super.key,
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required this.images,
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required this.initialIndex,
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}) : assert(initialIndex >= 0 && initialIndex < images.length);
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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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// 声明 PageController 并初始化初始索引
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late PageController _pageController;
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// 记录当前显示的图片索引（用于更新页码）
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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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// 初始化控制器，设置初始页面
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_pageController = PageController(initialPage: widget.initialIndex);
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// 初始化当前索引为初始索引
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_currentIndex = widget.initialIndex;
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// 监听页面切换事件
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_pageController.addListener(() {
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// 取当前页面的整数索引（避免滑动过程中的小数）
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final currentPage = _pageController.page?.round() ?? 0;
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// 只有当索引变化时才更新状态
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if (currentPage != _currentIndex) {
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setState(() {
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_currentIndex = currentPage;
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});
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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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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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appBar: AppBar(
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backgroundColor: Colors.black54,
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elevation: 0,
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leading: IconButton(
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icon: const Icon(Icons.close, color: Colors.white),
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onPressed: () => Navigator.pop(context),
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),
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// 显示实时更新的页码（当前索引+1 / 总数量）
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title: Text(
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'${_currentIndex + 1}/${widget.images.length}',
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style: const TextStyle(color: Colors.white),
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),
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centerTitle: true,
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),
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body: PhotoViewGallery(
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pageOptions: widget.images.map((url) {
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return PhotoViewGalleryPageOptions(
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imageProvider: NetworkImage(url),
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minScale: PhotoViewComputedScale.contained,
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maxScale: PhotoViewComputedScale.covered * 2,
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// 点击空白处关闭预览
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onTapDown: (context, details, controllerValue) {
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Navigator.pop(context);
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},
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);
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}).toList(),
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pageController: _pageController,
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scrollDirection: Axis.horizontal,
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),
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);
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}
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}
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Widget networkImage(String url) {
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return ClipRRect(
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borderRadius: BorderRadius.circular(8),
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child: Image.network(
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url,
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fit: BoxFit.cover,
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loadingBuilder: (context, child, loadingProgress) {
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// 加载中显示占位符
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if (loadingProgress == null) return child;
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return Center(
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child: CircularProgressIndicator(
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value: loadingProgress.expectedTotalBytes != null
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? loadingProgress.cumulativeBytesLoaded /
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loadingProgress.expectedTotalBytes!
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: null,
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),
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);
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},
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errorBuilder: (context, error, stackTrace) {
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return Container(
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color: Colors.grey[200],
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child: const Icon(Icons.image, color: Colors.grey, size: 30),
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);
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},
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),
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);
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} |