Initial commit

lib/core/infra/system_audio/system_audio_controller.dart

@@ -0,0 +1,65 @@
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+
+class SystemVolumeEvent {
+  final int current;
+  final int max;
+  const SystemVolumeEvent({required this.current, required this.max});
+
+  double get percent => max == 0 ? 0 : current / max;
+}
+
+class SystemAudioController {
+  static const _methodChannel = MethodChannel('smplayer/system_audio');
+  static const _eventChannel = EventChannel('smplayer/system_audio_events');
+
+  SystemAudioController._();
+  static final SystemAudioController instance = SystemAudioController._();
+
+  Stream<SystemVolumeEvent>? _volumeChanges;
+
+  Stream<SystemVolumeEvent> get volumeChanges {
+    _volumeChanges ??= _eventChannel.receiveBroadcastStream().map((event) {
+      final map = (event as Map).cast<Object?, Object?>();
+      return SystemVolumeEvent(
+        current: (map['current'] as num).toInt(),
+        max: (map['max'] as num).toInt(),
+      );
+    });
+    return _volumeChanges!;
+  }
+
+  Future<SystemVolumeEvent> getVolume() async {
+    final result = await _methodChannel.invokeMapMethod<String, dynamic>(
+      'getVolume',
+    );
+    if (result == null) {
+      return const SystemVolumeEvent(current: 0, max: 15);
+    }
+    return SystemVolumeEvent(
+      current: (result['current'] as num).toInt(),
+      max: (result['max'] as num).toInt(),
+    );
+  }
+
+  Future<SystemVolumeEvent> adjustVolume(int delta) async {
+    final result = await _methodChannel.invokeMapMethod<String, dynamic>(
+      'adjustVolume',
+      {'delta': delta},
+    );
+    if (result == null) {
+      return const SystemVolumeEvent(current: 0, max: 15);
+    }
+    return SystemVolumeEvent(
+      current: (result['current'] as num).toInt(),
+      max: (result['max'] as num).toInt(),
+    );
+  }
+
+  Future<void> setKeyIntercept(bool enabled) async {
+    await _methodChannel.invokeMethod<void>('setKeyIntercept', {
+      'enabled': enabled,
+    });
+  }
+}