60 lines
1.6 KiB
Dart
60 lines
1.6 KiB
Dart
|
import 'dart:io';
|
|||
|
|
import 'package:flutter/material.dart';
|
|||
|
|
import 'package:webview_flutter/webview_flutter.dart';
|
|||
|
|
|
|||
|
|
class AttachmentWebViewer extends StatefulWidget {
|
|||
|
|
final String fileUrl; // 文件的网络地址
|
|||
|
|
final String fileName; // 显示在 AppBar 上的名称（可选）
|
|||
|
|
|
|||
|
|
const AttachmentWebViewer({
|
|||
|
|
super.key,
|
|||
|
|
required this.fileUrl,
|
|||
|
|
this.fileName = '附件预览',
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
@override
|
|||
|
|
State<AttachmentWebViewer> createState() => _AttachmentWebViewerState();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
class _AttachmentWebViewerState extends State<AttachmentWebViewer> {
|
|||
|
|
late final WebViewController _controller;
|
|||
|
|
bool _isLoading = true;
|
|||
|
|
|
|||
|
|
@override
|
|||
|
|
void initState() {
|
|||
|
|
super.initState();
|
|||
|
|
|
|||
|
|
// 初始化 WebView 控制器
|
|||
|
|
_controller = WebViewController()
|
|||
|
|
..setJavaScriptMode(JavaScriptMode.unrestricted)
|
|||
|
|
..setNavigationDelegate(NavigationDelegate(
|
|||
|
|
onPageFinished: (_) => setState(() => _isLoading = false),
|
|||
|
|
))
|
|||
|
|
..loadRequest(Uri.parse(_buildPreviewUrl(widget.fileUrl)));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// 构造预览链接（pdf 直接打开，其它用 Google Docs）
|
|||
|
|
String _buildPreviewUrl(String url) {
|
|||
|
|
final lower = url.toLowerCase();
|
|||
|
|
if (lower.endsWith('.pdf')) {
|
|||
|
|
return url;
|
|||
|
|
} else {
|
|||
|
|
return 'https://docs.google.com/gview?embedded=true&url=$url';
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@override
|
|||
|
|
Widget build(BuildContext context) {
|
|||
|
|
return Scaffold(
|
|||
|
|
appBar: AppBar(title: Text(widget.fileName)),
|
|||
|
|
body: Stack(
|
|||
|
|
children: [
|
|||
|
|
WebViewWidget(controller: _controller),
|
|||
|
|
if (_isLoading)
|
|||
|
|
const Center(child: CircularProgressIndicator()),
|
|||
|
|
],
|
|||
|
|
),
|
|||
|
|
);
|
|||
|
|
}
|
|||
|
|
}
|