disable previous and next button

if there is no corresponding media; set play/pause symbol via model
property instead of via qml.

LenaPi/MusicPlayer.qml

@@ -59,7 +59,7 @@ Item{
                 width: 60
                 imageSource: "qrc:/icon_previous"
 
-                // visible: model.pHasPrevious
+                enabled: musicModel.pHasPrevious
 
                 onClicked:{
                     musicModel.playPrevious();
@@ -69,14 +69,14 @@ Item{
                 id: playPause
                 anchors.verticalCenter: parent.verticalCenter
                 width: 80
-                imageSource: "qrc:/icon_play"
+                imageSource: musicModel.pIsPlaying ? "qrc:/icon_pause" : "qrc:/icon_play"
 
                 onClicked:{
                     musicModel.playPause();
-                    if(imageSource == "qrc:/icon_play")
+                   /* if(imageSource == "qrc:/icon_play")
                         imageSource = "qrc:/icon_pause"
                     else
-                        imageSource = "qrc:/icon_play"
+                        imageSource = "qrc:/icon_play"*/
                 }
             }
             RoundButton{
@@ -86,9 +86,11 @@ Item{
                 width: 60
                 imageSource: "qrc:/icon_stop"
 
+                enabled: musicModel.pIsPlaying
+
                 onClicked:{
                     musicModel.stopMusic();
-                    playPause.imageSource = "qrc:/icon_play"
+                    //playPause.imageSource = "qrc:/icon_play"
                 }
             }
             RoundButton{
@@ -98,7 +100,7 @@ Item{
                 width: 60
                 imageSource: "qrc:/icon_next"
 
-                // visible: model.pHasNext
+                enabled: musicModel.pHasNext
 
                 onClicked:{
                     musicModel.playNext();

LenaPi/RoundButton.qml

@@ -21,6 +21,15 @@ Rectangle {
         height: width
         source: "qrc:/icon_back"
     }
+    Rectangle{
+        id: overlay
+        z: 1
+        visible: !container.enabled
+        anchors.centerIn: parent
+        width: 30
+        height: width
+        color: "#99ffffff"
+    }
 
     MouseArea{
         id: controlObject

LenaPi/controllers/MusicController.cpp

@@ -19,6 +19,8 @@ MusicController::MusicController(QObject *parent) : QObject(parent)
     connect(mModel, &MusicModel::navigateTo, [this](NavigationItemModel*){
         if(mModel->isPlaying()) mModel->playPause();
     });
+
+    connect(mPlayer, SIGNAL(nextItemSet(VlcMedia*)), mModel, SLOT(onNextMediaSet(VlcMedia*)));
 }
 
 MusicController::~MusicController()

LenaPi/models/MusicModel.cpp

@@ -23,6 +23,11 @@ void MusicModel::init(NavigationItemModel *item)
     mCurrentItem = item;
     emit currentItemChanged();
 
+    mHasNext = false;
+    mHasPrevious = false;
+    emit hasNextChanged();
+    emit hasPrevious();
+
     while(mMedia->count() > 0){
         mMedia->removeMedia(0);
     }
@@ -46,6 +51,7 @@ void MusicModel::navigateBack()
 void MusicModel::playPause()
 {
     mIsPlaying = !mIsPlaying;
+    emit isPlayingChanged();
     if(mIsPlaying)
         emit play();
     else
@@ -56,6 +62,11 @@ void MusicModel::stopMusic()
 {
     if(mIsPlaying){
         mIsPlaying = false;
+        mHasNext = false;
+        mHasPrevious = false;
+        emit hasNextChanged();
+        emit hasPreviousChanged();
+        emit isPlayingChanged();
         emit stop();
     }
 }
@@ -63,11 +74,19 @@ void MusicModel::stopMusic()
 void MusicModel::playNext()
 {
     emit next();
+    if(!mIsPlaying){
+        mIsPlaying = true;
+        emit isPlayingChanged();
+    }
 }
 
 void MusicModel::playPrevious()
 {
     emit previous();
+    if(!mIsPlaying){
+        mIsPlaying = true;
+        emit isPlayingChanged();
+    }
 }
 
 NavigationItemModel *MusicModel::getCurrentItem()
@@ -84,3 +103,27 @@ bool MusicModel::isPlaying()
 {
     return mIsPlaying;
 }
+
+bool MusicModel::hasNext()
+{
+    return mHasNext;
+}
+
+bool MusicModel::hasPrevious()
+{
+    return mHasPrevious;
+}
+
+void MusicModel::onNextMediaSet(VlcMedia *media)
+{
+    mHasNext = true;
+    mHasPrevious = true;
+    if(mMedia->at(0) == media){
+        mHasPrevious = false;
+    }
+    if(mMedia->at(mMedia->count()-1) == media){
+        mHasNext = false;
+    }
+    emit hasPreviousChanged();
+    emit hasNextChanged();
+}

LenaPi/models/MusicModel.h

@@ -11,8 +11,9 @@ class MusicModel : public QObject
     Q_OBJECT
 
     Q_PROPERTY(QObject* pCurrentItem READ getCurrentItem NOTIFY currentItemChanged)
-    //Q_PROPERTY(QObject* pHasNext READ hasNext NOTIFY hasNextChanged)
-    //Q_PROPERTY(QObject* pHasPrevious READ hasPrevious NOTIFY hasPreviousChanged)
+    Q_PROPERTY(bool pHasNext READ hasNext NOTIFY hasNextChanged)
+    Q_PROPERTY(bool pHasPrevious READ hasPrevious NOTIFY hasPreviousChanged)
+    Q_PROPERTY(bool pIsPlaying READ isPlaying NOTIFY isPlayingChanged)
 
 signals:
     void navigateTo(NavigationItemModel *item);
@@ -22,6 +23,9 @@ signals:
     void stop();
     void previous();
     void next();
+    void hasPreviousChanged();
+    void hasNextChanged();
+    void isPlayingChanged();
 
 public:
     MusicModel(VlcInstance* instance, QObject *parent = Q_NULLPTR);
@@ -40,9 +44,16 @@ public:
      VlcMediaList *getMedia();
 
     bool isPlaying();
+    bool hasNext();
+    bool hasPrevious();
+
+public slots:
+    void onNextMediaSet(VlcMedia* media);
 
 private:
     bool mIsPlaying = false;
+    bool mHasNext = false;
+    bool mHasPrevious = false;
     NavigationItemModel* mCurrentItem = Q_NULLPTR;
     VlcMediaList* mMedia = Q_NULLPTR;
     VlcInstance* mVlc;