87 lines
2.6 KiB
Dart
87 lines
2.6 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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} |