Add volume control

LenaPi/controllers/MusicController.h

@@ -8,6 +8,7 @@
 #include <VLCQtCore/Common.h>
 #include <VLCQtCore/Instance.h>
 #include <VLCQtCore/MediaListPlayer.h>
+#include <VLCQtCore/Audio.h>
 
 class MusicModel;
 
@@ -31,12 +32,21 @@ private:
 
     QQmlContext* mContext = Q_NULLPTR;
 
-    MusicModel* mModel;
+    MusicModel* mModel = Q_NULLPTR;
 
-    VlcInstance* mVlc;
-    VlcMediaListPlayer* mPlayer;
+    VlcInstance* mVlc = Q_NULLPTR;
+    VlcMediaListPlayer* mPlayer = Q_NULLPTR;
+    VlcAudio* mVlcAudio = Q_NULLPTR;
 
     bool mIsMediaListSet = false;
+
+ private slots:
+    /**
+     * @brief Stop player if necessary and forward signal navigatTo
+     * @param item target of navigation request
+     * @see navigateTo(NavigationItemModel* item);
+     */
+    void onNavigationRequest(NavigationItemModel* item);
 };
 
 #endif // MUSICCONTROLLER_H