init
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Nedifinita
398
lib/screens/main_screen.dart
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398
lib/screens/main_screen.dart
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'dart:async';
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import 'package:flutter_blue_plus/flutter_blue_plus.dart';
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import 'package:lbjconsole/models/merged_record.dart';
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import 'package:lbjconsole/models/train_record.dart';
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import 'package:lbjconsole/screens/history_screen.dart';
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import 'package:lbjconsole/screens/map_screen.dart';
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import 'package:lbjconsole/screens/settings_screen.dart';
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import 'package:lbjconsole/services/ble_service.dart';
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import 'package:lbjconsole/services/database_service.dart';
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import 'package:lbjconsole/services/notification_service.dart';
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import 'package:lbjconsole/themes/app_theme.dart';
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class MainScreen extends StatefulWidget {
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const MainScreen({super.key});
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@override
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State<MainScreen> createState() => _MainScreenState();
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}
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class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
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int _currentIndex = 0;
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late final BLEService _bleService;
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final NotificationService _notificationService = NotificationService();
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StreamSubscription? _connectionSubscription;
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StreamSubscription? _dataSubscription;
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bool _isHistoryEditMode = false;
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final GlobalKey<HistoryScreenState> _historyScreenKey =
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GlobalKey<HistoryScreenState>();
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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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_bleService = BLEService();
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_bleService.initialize();
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_initializeServices();
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}
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@override
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void dispose() {
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_connectionSubscription?.cancel();
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_dataSubscription?.cancel();
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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) {
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_bleService.onAppResume();
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}
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}
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Future<void> _initializeServices() async {
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await _notificationService.initialize();
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_connectionSubscription = _bleService.connectionStream.listen((_) {
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if (mounted) setState(() {});
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});
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_dataSubscription = _bleService.dataStream.listen((record) {
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_notificationService.showTrainNotification(record);
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if (_historyScreenKey.currentState != null) {
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_historyScreenKey.currentState!.loadRecords(scrollToTop: true);
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}
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});
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}
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void _showConnectionDialog() {
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_bleService.setAutoConnectBlocked(true);
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showDialog(
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context: context,
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barrierDismissible: true,
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builder: (context) =>
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_PixelPerfectBluetoothDialog(bleService: _bleService),
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).then((_) {
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_bleService.setAutoConnectBlocked(false);
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if (!_bleService.isManualDisconnect) {
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_bleService.ensureConnection();
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}
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});
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}
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AppBar _buildAppBar(BuildContext context) {
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final historyState = _historyScreenKey.currentState;
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final selectedCount = historyState?.getSelectedCount() ?? 0;
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if (_currentIndex == 0 && _isHistoryEditMode) {
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return AppBar(
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backgroundColor: Theme.of(context).primaryColor,
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leading: IconButton(
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icon: const Icon(Icons.close, color: Colors.white),
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onPressed: _handleHistoryCancelSelection,
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),
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title: Text(
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'已选择 $selectedCount 项',
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style: const TextStyle(color: Colors.white, fontSize: 18),
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),
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actions: [
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IconButton(
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icon: const Icon(Icons.delete, color: Colors.white),
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onPressed: selectedCount > 0 ? _handleHistoryDeleteSelected : null,
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),
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],
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);
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}
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return AppBar(
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backgroundColor: AppTheme.primaryBlack,
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elevation: 0,
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title: Text(
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['列车记录', '位置地图', '设置'][_currentIndex],
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style: const TextStyle(
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color: Colors.white, fontSize: 20, fontWeight: FontWeight.bold),
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),
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centerTitle: false,
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actions: [
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Row(
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children: [
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Container(
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width: 8,
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height: 8,
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decoration: BoxDecoration(
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color: _bleService.isConnected ? Colors.green : Colors.red,
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shape: BoxShape.circle,
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),
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),
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const SizedBox(width: 8),
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Text(_bleService.deviceStatus,
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style: const TextStyle(color: Colors.white70)),
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IconButton(
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icon: const Icon(Icons.bluetooth, color: Colors.white),
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onPressed: _showConnectionDialog,
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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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void _handleHistoryEditModeChanged(bool isEditing) {
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setState(() {
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_isHistoryEditMode = isEditing;
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if (!isEditing) {
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_historyScreenKey.currentState?.clearSelection();
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}
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});
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}
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void _handleSelectionChanged() {
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if (_isHistoryEditMode &&
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(_historyScreenKey.currentState?.getSelectedCount() ?? 0) == 0) {
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_handleHistoryCancelSelection();
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} else {
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setState(() {});
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}
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}
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void _handleHistoryCancelSelection() {
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_historyScreenKey.currentState?.setEditMode(false);
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}
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Future<void> _handleHistoryDeleteSelected() async {
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final historyState = _historyScreenKey.currentState;
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if (historyState == null || historyState.getSelectedCount() == 0) return;
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final confirmed = await showDialog<bool>(
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context: context,
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builder: (context) => AlertDialog(
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title: const Text('确认删除'),
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content: Text('确定要删除选中的 ${historyState.getSelectedCount()} 条记录吗？'),
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actions: [
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TextButton(
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onPressed: () => Navigator.pop(context, false),
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child: const Text('取消')),
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ElevatedButton(
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onPressed: () => Navigator.pop(context, true),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.red, foregroundColor: Colors.white),
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child: const Text('删除'),
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),
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],
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),
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);
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if (confirmed == true) {
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final idsToDelete = historyState.getSelectedRecordIds().toList();
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await DatabaseService.instance.deleteRecords(idsToDelete);
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historyState.setEditMode(false);
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historyState.loadRecords(scrollToTop: false);
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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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SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
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statusBarColor: Colors.transparent,
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systemNavigationBarColor: AppTheme.primaryBlack,
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statusBarIconBrightness: Brightness.light,
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systemNavigationBarIconBrightness: Brightness.light,
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));
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final pages = [
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HistoryScreen(
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key: _historyScreenKey,
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onEditModeChanged: _handleHistoryEditModeChanged,
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onSelectionChanged: _handleSelectionChanged,
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),
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const MapScreen(),
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const SettingsScreen(),
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];
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return Scaffold(
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backgroundColor: AppTheme.primaryBlack,
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appBar: _buildAppBar(context),
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body: IndexedStack(
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index: _currentIndex,
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children: pages,
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),
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bottomNavigationBar: NavigationBar(
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backgroundColor: AppTheme.secondaryBlack,
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indicatorColor: AppTheme.accentBlue.withOpacity(0.2),
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selectedIndex: _currentIndex,
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onDestinationSelected: (index) {
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if (_currentIndex == 2 && index == 0) {
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_historyScreenKey.currentState?.loadRecords();
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}
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setState(() {
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if (_isHistoryEditMode) _isHistoryEditMode = false;
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_currentIndex = index;
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});
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},
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destinations: const [
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NavigationDestination(
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icon: Icon(Icons.directions_railway), label: '列车记录'),
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NavigationDestination(icon: Icon(Icons.location_on), label: '位置地图'),
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NavigationDestination(icon: Icon(Icons.settings), label: '设置'),
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],
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),
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);
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}
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}
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enum _ScanState { initial, scanning, finished }
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class _PixelPerfectBluetoothDialog extends StatefulWidget {
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final BLEService bleService;
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const _PixelPerfectBluetoothDialog({required this.bleService});
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@override
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State<_PixelPerfectBluetoothDialog> createState() =>
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_PixelPerfectBluetoothDialogState();
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}
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class _PixelPerfectBluetoothDialogState
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extends State<_PixelPerfectBluetoothDialog> {
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List<BluetoothDevice> _devices = [];
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_ScanState _scanState = _ScanState.initial;
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StreamSubscription? _connectionSubscription;
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@override
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void initState() {
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super.initState();
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_connectionSubscription = widget.bleService.connectionStream.listen((_) {
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if (mounted) setState(() {});
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});
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if (!widget.bleService.isConnected) {
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_startScan();
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}
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}
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@override
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void dispose() {
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_connectionSubscription?.cancel();
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super.dispose();
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}
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Future<void> _startScan() async {
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if (_scanState == _ScanState.scanning) return;
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if (mounted)
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setState(() {
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_devices.clear();
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_scanState = _ScanState.scanning;
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});
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await widget.bleService.startScan(
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timeout: const Duration(seconds: 8),
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onScanResults: (devices) {
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if (mounted) setState(() => _devices = devices);
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},
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);
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if (mounted) setState(() => _scanState = _ScanState.finished);
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}
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Future<void> _connectToDevice(BluetoothDevice device) async {
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Navigator.pop(context);
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await widget.bleService.connectManually(device);
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}
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Future<void> _disconnect() async {
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Navigator.pop(context);
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await widget.bleService.disconnect();
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}
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@override
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Widget build(BuildContext context) {
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final isConnected = widget.bleService.isConnected;
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return AlertDialog(
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title: const Text('蓝牙设备'),
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content: SizedBox(
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width: double.maxFinite,
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child: SingleChildScrollView(
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child: isConnected
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? _buildConnectedView(context, widget.bleService.connectedDevice)
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: _buildDisconnectedView(context),
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),
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),
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actions: [
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TextButton(
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onPressed: () => Navigator.pop(context),
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child: const Text('关闭'),
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),
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],
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);
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}
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Widget _buildConnectedView(BuildContext context, BluetoothDevice? device) {
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return Column(mainAxisSize: MainAxisSize.min, children: [
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const Icon(Icons.bluetooth_connected, size: 48, color: Colors.green),
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const SizedBox(height: 16),
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Text('设备已连接',
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style: Theme.of(context)
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.textTheme
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.titleMedium
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?.copyWith(fontWeight: FontWeight.bold)),
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const SizedBox(height: 4),
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Text(device?.platformName ?? '未知设备', textAlign: TextAlign.center),
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Text(device?.remoteId.str ?? '',
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style: Theme.of(context).textTheme.bodySmall,
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textAlign: TextAlign.center),
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const SizedBox(height: 16),
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ElevatedButton.icon(
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onPressed: _disconnect,
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icon: const Icon(Icons.bluetooth_disabled),
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label: const Text('断开连接'),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.red, foregroundColor: Colors.white))
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]);
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}
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Widget _buildDisconnectedView(BuildContext context) {
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return Column(mainAxisSize: MainAxisSize.min, children: [
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ElevatedButton.icon(
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onPressed: _scanState == _ScanState.scanning ? null : _startScan,
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icon: _scanState == _ScanState.scanning
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? const SizedBox(
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width: 16,
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height: 16,
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child: CircularProgressIndicator(
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strokeWidth: 2, color: Colors.white))
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: const Icon(Icons.search),
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label: Text(_scanState == _ScanState.scanning ? '扫描中...' : '扫描设备'),
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style: ElevatedButton.styleFrom(
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minimumSize: const Size(double.infinity, 40))),
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const SizedBox(height: 16),
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if (_scanState == _ScanState.finished && _devices.isNotEmpty)
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_buildDeviceListView()
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]);
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}
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Widget _buildDeviceListView() {
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return SizedBox(
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height: 200,
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child: ListView.builder(
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shrinkWrap: true,
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itemCount: _devices.length,
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itemBuilder: (context, index) {
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final device = _devices[index];
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return Card(
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margin: const EdgeInsets.symmetric(vertical: 4),
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child: ListTile(
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leading: const Icon(Icons.bluetooth),
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title: Text(device.platformName.isNotEmpty
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? device.platformName
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: '未知设备'),
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subtitle: Text(device.remoteId.str),
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onTap: () => _connectToDevice(device),
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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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