146 lines
4.0 KiB
Dart
146 lines
4.0 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import 'package:revoltvpn/logic/app_colors.dart';
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import 'package:revoltvpn/logic/vpn_connection.dart';
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import 'package:revoltvpn/screens/main_screen.dart';
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class IntroScreen extends StatefulWidget {
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const IntroScreen({super.key});
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@override
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State<IntroScreen> createState() => _IntroScreenState();
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}
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class _IntroScreenState extends State<IntroScreen> with WidgetsBindingObserver {
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static const _minDisplay = Duration(milliseconds: 500);
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static const _bootTimeout = Duration(seconds: 8);
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String _status = 'Starting secure engine…';
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bool _bootComplete = false;
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bool _navigated = false;
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addObserver(this);
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_boot();
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}
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(this);
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super.dispose();
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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if (state == AppLifecycleState.resumed) _navigateIfReady();
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}
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Future<void> _boot() async {
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final elapsed = Stopwatch()..start();
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final vpn = context.read<VpnConnection>();
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try {
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await vpn.ready.timeout(_bootTimeout);
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} on TimeoutException {
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debugPrint('[Boot] Engine init exceeded ${_bootTimeout.inSeconds}s '
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'— continuing to the main screen anyway.');
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} catch (e) {
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debugPrint('[Boot] Engine init error: $e');
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}
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if (!mounted) return;
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setState(() => _status = 'Ready');
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final remaining = _minDisplay - elapsed.elapsed;
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if (remaining > Duration.zero) await Future.delayed(remaining);
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if (!mounted) return;
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_bootComplete = true;
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_navigateIfReady();
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}
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void _navigateIfReady() {
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if (!mounted || _navigated || !_bootComplete) return;
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if (WidgetsBinding.instance.lifecycleState == AppLifecycleState.paused) {
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return; // resume will call back in
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}
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_navigated = true;
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Navigator.of(context).pushReplacement(
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PageRouteBuilder(
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transitionDuration: const Duration(milliseconds: 400),
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pageBuilder: (_, __, ___) => const MainScreen(),
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transitionsBuilder: (_, animation, __, child) {
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return FadeTransition(opacity: animation, child: child);
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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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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: AppColors.bgDeep,
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body: Column(
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children: [
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const Spacer(flex: 7),
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// Image slightly below center
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Center(
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child: Image.asset(
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'assets/brand.png',
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width: 200,
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height: 200,
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errorBuilder: (context, error, stackTrace) {
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return const Icon(
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Icons.shield,
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size: 200,
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color: AppColors.accent,
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);
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},
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),
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),
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// Spinner + text paired together below the image
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const SizedBox(height: 8),
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const SizedBox(
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width: 40,
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height: 40,
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child: CircularProgressIndicator(
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color: AppColors.accent,
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strokeWidth: 3.0,
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),
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),
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const SizedBox(height: 4),
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const Text(
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'Revolt VPN',
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style: TextStyle(
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color: AppColors.textWhite,
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fontSize: 28,
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fontWeight: FontWeight.bold,
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letterSpacing: 2.0,
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),
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),
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const SizedBox(height: 10),
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// Says what the spinner is actually waiting on.
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AnimatedSwitcher(
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duration: const Duration(milliseconds: 250),
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child: Text(
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_status,
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key: ValueKey(_status),
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style: const TextStyle(
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color: AppColors.textDim,
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fontSize: 13,
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letterSpacing: 0.5,
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),
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),
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),
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const Spacer(flex: 5),
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const SizedBox(height: 12),
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],
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),
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);
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}
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}
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