79 lines
2.5 KiB
Dart
79 lines
2.5 KiB
Dart
import 'dart:io';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:photo_view/photo_view.dart';
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import 'package:qhd_prevention/pages/my_appbar.dart';
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// 查看大图
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class SingleImageViewer extends StatelessWidget {
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final String imageUrl;
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const SingleImageViewer({Key? key, required this.imageUrl}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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ImageProvider provider;
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// 选择图片来源：网络 / asset / 本地文件（优先检测 http，然后 asset，再文件）
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if (imageUrl.toLowerCase().startsWith('http')) {
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provider = NetworkImage(imageUrl);
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} else if (imageUrl.startsWith('assets/') ||
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imageUrl.startsWith('package:') ||
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imageUrl.startsWith('packages/')) {
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// 明确标记为工程资源（asset）
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provider = AssetImage(imageUrl) as ImageProvider;
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} else {
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// 不是明确的网络或 asset 路径 —— 在非 web 平台尝试作为文件路径
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if (!kIsWeb) {
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try {
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final file = File(imageUrl);
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if (file.existsSync()) {
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provider = FileImage(file);
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} else {
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// 文件不存在时尝试作为 asset 路径回退
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provider = AssetImage(imageUrl) as ImageProvider;
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}
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} catch (e) {
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// 任何异常都回退为 asset 尝试（避免抛出）
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provider = AssetImage(imageUrl) as ImageProvider;
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}
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} else {
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// web 平台没有 File API，可直接尝试当作 asset
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provider = AssetImage(imageUrl) as ImageProvider;
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}
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}
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return Scaffold(
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backgroundColor: Colors.black.withValues(alpha: 0.5),
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appBar: MyAppbar(
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isBack: false,
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actions: [
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IconButton(
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onPressed: () {
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Navigator.of(context).pop();
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},
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icon: const Icon(
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Icons.close,
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color: Colors.white,
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size: 40,
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),
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)
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],
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backgroundColor: Colors.black.withValues(alpha: 0.5),
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title: '',
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),
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body: Center(
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child: PhotoView(
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imageProvider: provider,
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backgroundDecoration: BoxDecoration(color: Colors.black.withValues(alpha: 0.5)),
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minScale: PhotoViewComputedScale.contained,
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maxScale: PhotoViewComputedScale.covered * 2,
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onTapUp: (context, details, controllerValue) {
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Navigator.of(context).pop();
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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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