605 lines
16 KiB
Dart
605 lines
16 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:url_launcher/url_launcher.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import 'config/app_config.dart';
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const _shellBackground = Color(0xFFF8FBFF);
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const _shellAccent = Color(0xFF0089FF);
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const _shellSubText = Color(0xFF8E9AB0);
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const _showH5DebugOverlay = bool.fromEnvironment(
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'H5_SHELL_DEBUG',
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defaultValue: true,
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);
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const _shellBrandingChannel =
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MethodChannel('io.openim.flutter.im_webview_app/shell_branding');
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const _h5MountedCheckScript = r'''
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(() => document.body?.classList.contains('app-mounted') === true)();
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''';
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const _h5SnapshotScript = r'''
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(() => {
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const shrinkAssetUrl = (value) => {
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try {
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const absolute = new URL(value, window.location.href).href;
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const match = absolute.match(/\/assets\/[^?#]+/);
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return match ? match[0] : absolute;
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} catch (_) {
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return value || '';
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}
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};
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const scripts = Array.from(document.scripts)
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.map((script) => script.src)
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.filter(Boolean)
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.map(shrinkAssetUrl)
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.filter((src) => src.includes('/assets/'));
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const bodyText = (document.body?.innerText || '')
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.replace(/\s+/g, ' ')
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.slice(0, 180);
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let shellBrand = '';
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try {
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shellBrand = window.sessionStorage.getItem('OPENIM_FLUTTER_SHELL_BRAND') || '';
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} catch (_) {}
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return JSON.stringify({
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href: window.location.href,
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scripts,
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bodyText,
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shellBrand,
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});
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})();
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''';
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Future<void> main() async {
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WidgetsFlutterBinding.ensureInitialized();
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SystemChrome.setSystemUIOverlayStyle(
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const SystemUiOverlayStyle(
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statusBarColor: Colors.transparent,
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statusBarIconBrightness: Brightness.dark,
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systemNavigationBarColor: _shellBackground,
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systemNavigationBarIconBrightness: Brightness.dark,
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),
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);
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runApp(const ImWebViewApp());
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}
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class ShellBranding {
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const ShellBranding({
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required this.appName,
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required this.appLogo,
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});
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static const fallback = ShellBranding(
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appName: AppConfig.appName,
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appLogo: AppConfig.appLogo,
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);
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final String appName;
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final String appLogo;
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static Future<ShellBranding> load() async {
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try {
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final data = await _shellBrandingChannel
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.invokeMapMethod<String, String>('getShellBranding');
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final appName = _trim(data?['appName']);
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final appLogo = _trim(data?['appLogo']);
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return ShellBranding(
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appName: appName.isNotEmpty ? appName : fallback.appName,
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appLogo: appLogo.isNotEmpty ? appLogo : fallback.appLogo,
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);
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} catch (_) {
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return fallback;
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}
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}
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static String _trim(String? value) => value?.trim() ?? '';
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}
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class ImWebViewApp extends StatelessWidget {
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const ImWebViewApp({
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super.key,
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this.shellBranding = ShellBranding.fallback,
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});
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final ShellBranding shellBranding;
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: shellBranding.appName,
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debugShowCheckedModeBanner: false,
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theme: ThemeData(
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colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF1F6FEB)),
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scaffoldBackgroundColor: _shellBackground,
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useMaterial3: true,
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),
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home: H5ShellPage(initialShellBranding: shellBranding),
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);
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}
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}
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class H5ShellPage extends StatefulWidget {
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const H5ShellPage({super.key, required this.initialShellBranding});
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final ShellBranding initialShellBranding;
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@override
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State<H5ShellPage> createState() => _H5ShellPageState();
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}
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class _H5ShellPageState extends State<H5ShellPage> {
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late final WebViewController _controller;
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int _progress = 0;
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String? _loadError;
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String _h5DebugText = 'H5 loading...';
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bool _showShellCover = true;
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bool _shellBrandingLoaded = false;
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late ShellBranding _shellBranding;
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@override
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void initState() {
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super.initState();
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_shellBranding = widget.initialShellBranding;
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_controller = _buildController();
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unawaited(_loadHome());
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}
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WebViewController _buildController() {
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return WebViewController()
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..setJavaScriptMode(JavaScriptMode.unrestricted)
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..setBackgroundColor(_shellBackground)
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..setNavigationDelegate(
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NavigationDelegate(
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onProgress: (progress) {
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if (mounted) {
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setState(() => _progress = progress);
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}
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},
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onPageStarted: (_) {
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if (mounted) {
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setState(() {
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_loadError = null;
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_progress = 0;
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_showShellCover = true;
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});
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}
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},
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onPageFinished: (_) {
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unawaited(_handlePageFinished());
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},
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onWebResourceError: (error) {
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if (error.isForMainFrame ?? true) {
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if (mounted) {
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setState(() {
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_loadError = error.description;
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_showShellCover = false;
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});
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}
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}
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},
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onNavigationRequest: _handleNavigationRequest,
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),
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);
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}
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Future<void> _runJavaScriptSafely(String source) async {
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try {
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await _controller.runJavaScript(source);
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} catch (_) {
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// WebView can reject JavaScript while a page is still navigating.
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}
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}
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String _freshHomeUrl() {
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return AppConfig.homeUrl();
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}
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Future<void> _handlePageFinished() async {
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await _loadShellBrandingIfNeeded();
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await _waitForH5Mounted();
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await _syncShellBranding();
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await _updateH5DebugSnapshot();
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if (mounted) {
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setState(() {
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_progress = 100;
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_showShellCover = false;
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});
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}
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}
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Future<void> _loadShellBrandingIfNeeded() async {
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if (_shellBrandingLoaded) {
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return;
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}
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final shellBranding = await ShellBranding.load();
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_shellBrandingLoaded = true;
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if (!mounted) {
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_shellBranding = shellBranding;
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return;
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}
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setState(() {
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_shellBranding = shellBranding;
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});
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}
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Future<void> _syncShellBranding() {
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final payload = jsonEncode({
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'name': _shellBranding.appName,
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'logo': _shellBranding.appLogo,
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});
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final script = '''
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(() => {
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try {
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const brand = $payload;
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window.sessionStorage.setItem('OPENIM_FLUTTER_SHELL_BRAND', JSON.stringify(brand));
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window.dispatchEvent(new CustomEvent('openim-shell-branding-updated', { detail: brand }));
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} catch (_) {}
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})();
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''';
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return _runJavaScriptSafely(script);
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}
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Future<void> _waitForH5Mounted() async {
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for (var index = 0; index < 20; index += 1) {
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try {
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final result = await _controller.runJavaScriptReturningResult(
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_h5MountedCheckScript,
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);
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if (result == true || result.toString() == 'true') {
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return;
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}
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} catch (_) {}
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await Future<void>.delayed(const Duration(milliseconds: 100));
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}
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}
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Future<void> _updateH5DebugSnapshot() async {
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if (!_showH5DebugOverlay) {
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return;
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}
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try {
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final result = await _controller.runJavaScriptReturningResult(
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_h5SnapshotScript,
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);
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final snapshot = _decodeJavaScriptStringResult(result);
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debugPrint('[H5Shell] snapshot: $snapshot');
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if (mounted) {
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setState(() => _h5DebugText = snapshot);
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}
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} catch (error) {
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debugPrint('[H5Shell] snapshot failed: $error');
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if (mounted) {
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setState(() => _h5DebugText = 'H5 snapshot failed: $error');
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}
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}
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}
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String _decodeJavaScriptStringResult(Object? result) {
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if (result == null) {
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return '';
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}
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if (result is String) {
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try {
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final decoded = jsonDecode(result);
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if (decoded is String) {
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return decoded;
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}
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} catch (_) {}
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return result;
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}
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return result.toString();
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}
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Future<void> _loadHome() async {
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await _loadUrl(_freshHomeUrl());
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}
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Future<void> _loadUrl(String url) async {
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if (mounted) {
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setState(() {
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_loadError = null;
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_progress = 0;
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_showShellCover = true;
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});
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}
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await _clearWebViewHttpCache();
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await _controller.loadRequest(Uri.parse(url));
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}
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Future<void> _clearWebViewHttpCache() async {
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try {
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await _controller.clearCache();
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} catch (_) {
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// Some WebView implementations can reject cache operations before first use.
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}
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}
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Future<NavigationDecision> _handleNavigationRequest(
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NavigationRequest request,
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) async {
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final uri = Uri.tryParse(request.url);
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if (uri == null) {
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return NavigationDecision.prevent;
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}
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const webSchemes = {'http', 'https', 'about', 'data'};
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if (webSchemes.contains(uri.scheme)) {
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return NavigationDecision.navigate;
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}
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try {
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await launchUrl(uri, mode: LaunchMode.externalApplication);
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} catch (_) {
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// Ignore unsupported custom schemes so the WebView does not navigate to
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// an error page.
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}
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return NavigationDecision.prevent;
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}
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Future<void> _handleBackNavigation() async {
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if (await _controller.canGoBack()) {
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await _controller.goBack();
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} else {
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await SystemNavigator.pop();
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}
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}
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@override
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Widget build(BuildContext context) {
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return PopScope(
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canPop: false,
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onPopInvokedWithResult: (didPop, _) {
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if (!didPop) {
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unawaited(_handleBackNavigation());
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}
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},
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child: Scaffold(
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backgroundColor: _shellBackground,
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body: SafeArea(
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bottom: false,
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child: Stack(
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children: [
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const Positioned.fill(child: _ShellFallback()),
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WebViewWidget(controller: _controller),
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if (_showShellCover)
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const Positioned.fill(
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child: IgnorePointer(child: _ShellFallback()),
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),
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if (_progress < 100)
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LinearProgressIndicator(
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value: _progress == 0 ? null : _progress / 100,
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minHeight: 2,
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),
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if (_loadError != null)
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_ErrorPanel(
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message: _loadError!,
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onRetry: () => unawaited(_loadHome()),
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),
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if (_showH5DebugOverlay)
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Positioned(
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left: 8,
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right: 8,
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bottom: 10,
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child: IgnorePointer(
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child: _H5DebugOverlay(text: _h5DebugText),
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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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class _ErrorPanel extends StatelessWidget {
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const _ErrorPanel({required this.message, required this.onRetry});
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final String message;
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final VoidCallback onRetry;
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@override
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Widget build(BuildContext context) {
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return ColoredBox(
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color: Colors.white,
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child: Center(
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child: Padding(
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padding: const EdgeInsets.all(24),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.wifi_off_rounded, size: 44),
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const SizedBox(height: 16),
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const Text(
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'页面加载失败',
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style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
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),
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const SizedBox(height: 8),
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Text(
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message,
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textAlign: TextAlign.center,
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style: Theme.of(context).textTheme.bodyMedium,
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),
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const SizedBox(height: 20),
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FilledButton(
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onPressed: onRetry,
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child: const Text('重新加载'),
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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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class _H5DebugOverlay extends StatelessWidget {
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const _H5DebugOverlay({required this.text});
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final String text;
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@override
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Widget build(BuildContext context) {
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return DecoratedBox(
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decoration: BoxDecoration(
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color: Colors.black.withValues(alpha: 0.72),
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borderRadius: BorderRadius.circular(6),
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),
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
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child: Text(
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text,
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maxLines: 5,
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overflow: TextOverflow.ellipsis,
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style: const TextStyle(
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color: Colors.white,
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fontSize: 10,
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height: 1.25,
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letterSpacing: 0,
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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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class _ShellFallback extends StatelessWidget {
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const _ShellFallback();
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@override
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Widget build(BuildContext context) {
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return DecoratedBox(
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decoration: const 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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Color(0xFFE7F4FF),
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_shellBackground,
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Colors.white,
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],
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stops: [0, 0.44, 1],
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),
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),
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child: Stack(
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children: [
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const Positioned(
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top: 44,
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right: -72,
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child: _SoftCircle(size: 190, opacity: 0.42),
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),
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const Positioned(
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top: 210,
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left: -44,
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child: _SoftCircle(size: 160, opacity: 0.34),
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),
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const Positioned(
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right: -54,
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bottom: 250,
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child: _SoftCircle(size: 220, opacity: 0.38),
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),
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Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: const [
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_ShellMark(),
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SizedBox(height: 26),
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Text(
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'心有回响',
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style: TextStyle(
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color: _shellAccent,
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fontSize: 26,
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height: 1.2,
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fontWeight: FontWeight.w700,
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letterSpacing: 0,
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),
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),
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SizedBox(height: 10),
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Text(
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'正在为你唤醒会话',
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style: TextStyle(
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color: _shellSubText,
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fontSize: 13,
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height: 1.2,
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letterSpacing: 0,
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),
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),
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SizedBox(height: 32),
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SizedBox(
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width: 110,
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child: LinearProgressIndicator(
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minHeight: 3,
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backgroundColor: Color(0xFFDCEEFF),
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color: _shellAccent,
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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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class _ShellMark extends StatelessWidget {
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const _ShellMark();
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@override
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Widget build(BuildContext context) {
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return Container(
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width: 126,
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height: 126,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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gradient: const LinearGradient(
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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colors: [Color(0xFFA8DDFF), _shellAccent, Color(0xFF0066E8)],
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),
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boxShadow: [
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BoxShadow(
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color: _shellAccent.withValues(alpha: 0.2),
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blurRadius: 34,
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offset: const Offset(0, 18),
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),
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],
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),
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child: const Icon(
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Icons.check_rounded,
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color: Colors.white,
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size: 82,
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),
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);
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}
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}
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class _SoftCircle extends StatelessWidget {
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const _SoftCircle({required this.size, required this.opacity});
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final double size;
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final double opacity;
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@override
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Widget build(BuildContext context) {
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return Container(
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width: size,
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height: size,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: const Color(0xFFBFE4FF).withValues(alpha: opacity),
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),
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);
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}
|
|
}
|