car-interface-android/lib/core/display_controller.dart

import 'package:flutter/foundation.dart';

import '../data/repositories/settings_repository.dart';
import '../data/services/native_bridge.dart';

/// Applies the persisted "Prevent CarDash from sleeping" preference to the
/// Android window. The flag only applies while this window is visible.
class DisplayController extends ChangeNotifier {
  DisplayController(this._platform, this._settings)
    : _keepScreenOn = _settings.keepScreenOn;

  final LauncherPlatform _platform;
  final SettingsRepository _settings;

  bool _keepScreenOn;
  bool _disposed = false;

  bool get keepScreenOn => _keepScreenOn;

  Future<void> initialize() => _apply();

  Future<void> setKeepScreenOn(bool enabled) async {
    if (enabled == _keepScreenOn) return;
    _keepScreenOn = enabled;
    await _settings.setKeepScreenOn(enabled);
    await _apply();
    _notify();
  }

  /// Reapplies after resume, when Android may have recreated the window.
  Future<void> apply() => _apply();

  Future<void> _apply() async {
    try {
      await _platform.setKeepScreenOn(_keepScreenOn);
    } catch (_) {
      // Display flags are best-effort; settings remain persisted.
    }
  }

  void _notify() {
    if (!_disposed) notifyListeners();
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }
}