fixed next/previous buttons, simplyfied volume

LenaPi/controllers/MusicPlayer.cpp

@@ -6,10 +6,16 @@
 
 MusicPlayer::MusicPlayer(QObject *parent) : QMediaPlayer(parent)
 {
-    // relay base class signal as NOTIFY doesn't seem to be able to handle it directly
-    connect(this, &QMediaPlayer::volumeChanged, this, &MusicPlayer::audioVolumeChanged);
     // init audio
-    setAudioVolume(50);
+    /// @todo remove magic number
+    setVolume(50);
+    // relay signal to qml
+    connect(this, &QMediaPlayer::stateChanged, this, &MusicPlayer::isPlayingChanged);
+    connect(this, &QMediaPlayer::currentMediaChanged, this, [this](const QMediaContent&){
+        // notify qml to refresh enable state of next and previous button
+        emit hasNextChanged();
+        emit hasPreviousChanged();
+    });
 }
 
 void MusicPlayer::init(NavigationItemModel *item)
@@ -33,66 +39,54 @@ void MusicPlayer::navigateBack()
 
 void MusicPlayer::playPause()
 {
-    mIsPlaying = !mIsPlaying;
-    emit isPlayingChanged();
-    if(mIsPlaying)
-        play();
-    else
+    if(isPlaying())
         pause();
+    else
+        play();
 }
 
 void MusicPlayer::stopMusic()
 {
-    if(mIsPlaying){
-        mIsPlaying = false;
-        emit isPlayingChanged();
-
-        reset();
-
-        emit stop();
+    if(isPlaying()){
+       reset();
+       stop();
     }
 }
 
 void MusicPlayer::playNext()
 {
-    //emit next();
-    if(!mIsPlaying){
-        mIsPlaying = true;
-        emit isPlayingChanged();
-    }
+    if(!hasNext()) return; // checks if playlist exists
+    playlist()->next();
 }
 
 void MusicPlayer::playPrevious()
 {
-    //emit previous();
-    if(!mIsPlaying){
-        mIsPlaying = true;
-        emit isPlayingChanged();
-    }
+    if(!hasPrevious()) return;
+    playlist()->previous();
 }
 
 bool MusicPlayer::isPlaying() const
 {
-    return mIsPlaying;
+    return state() == State::PlayingState;
 }
 
 bool MusicPlayer::hasNext() const
 {
-    return mHasNext;
+    if(!playlist()) return false;
+    const auto nextIndex = playlist()->nextIndex();
+    /* player yields -1 as next index while playing last track
+     */
+    return nextIndex >=0 && nextIndex < playlist()->mediaCount();
 }
 
 bool MusicPlayer::hasPrevious() const
 {
-    return mHasPrevious;
-}
-
-void MusicPlayer::setAudioVolume(int newVolume)
-{
-    if(newVolume != volume()){
-        qDebug() << volume() << newVolume;
-        setVolume(newVolume);
-        // signal audioVolumeChanged will be emitted automatically
-    }
+    if(!playlist()) return false;
+    const auto previousIndex = playlist()->previousIndex();
+    /* player inits with currentIndex -1 and hence previousIndex = last index
+     * until started. Yet, previousButton should initially be disabled.
+     */
+    return  previousIndex >= 0 && previousIndex < playlist()->currentIndex();
 }
 
 double MusicPlayer::getProgress() const
@@ -130,11 +124,6 @@ void MusicPlayer::onLengthChanged(int length)
 
 void MusicPlayer::reset()
 {
-    mHasNext = false;
-    mHasPrevious = false;
-    emit hasNextChanged();
-    emit hasPreviousChanged();
-
     mCurrentMediaItemProgress = 0.0;
     mCurrentTime = 0.0;
     emit progressChanged();
@@ -168,7 +157,6 @@ void MusicPlayer::readMedia(const QString& path)
     for(auto file:files){
         auto fileName = file.absoluteFilePath();
         auto fileUrl = QUrl::fromLocalFile(fileName);
-        qDebug() << fileName << fileUrl;
         playList->addMedia(QMediaContent(fileUrl));
     }
 }

LenaPi/controllers/MusicPlayer.h

@@ -20,7 +20,6 @@ class MusicPlayer : public QMediaPlayer
     Q_PROPERTY(QString pMediaLength READ getMediaLength NOTIFY mediaLengthChanged)
     Q_PROPERTY(QString pTime READ getTime NOTIFY progressChanged)
     Q_PROPERTY(QString pMediaTitle READ getMediaTitle NOTIFY mediaTitleChanged)
-    Q_PROPERTY(int pAudioVolume READ getAudioVolume WRITE setAudioVolume NOTIFY audioVolumeChanged)
 
 signals:
     void navigateTo(NavigationItemModel *item);
@@ -31,7 +30,6 @@ signals:
     void progressChanged();
     void mediaLengthChanged();
     void mediaTitleChanged();
-    void audioVolumeChanged(int newVolume);
 
 public:
     MusicPlayer(QObject *parent = Q_NULLPTR);
@@ -50,25 +48,6 @@ public:
     bool hasNext() const;
     bool hasPrevious() const;
 
-    /**
-     * @brief Get audio volume. Range is in between 0 and 100
-     * Relays info from QMediaPlayer::volume as Q_PROPERTY does seem to have
-     * trouble accessing base class functions directly.
-     */
-    inline int getAudioVolume() const { return volume(); }
-    /**
-     * @brief Set audio volume.
-     * @param newVolume value between 0 and 100 (audio level in percent)
-     * Ensures that volume is inbetween 0 and 100. If this range is exceeded,
-     * the volume is set to the lowest and highest allowed value, respectively.
-     *
-     * Relay info to QMediaPlayer::setVolume as Q_PROPERTY does seem to have
-     * trouble accessing base class functions directly.
-     *
-     * @todo save to config file?
-     */
-    void setAudioVolume(int newVolume);
-
     double getProgress() const;
 
     QString getMediaTitle() const;
@@ -91,10 +70,6 @@ private:
     void readMedia(const QString& path);
     QString timeToString(int time);
 
-
-    bool mIsPlaying = false;
-    bool mHasNext = false;
-    bool mHasPrevious = false;
     int mCurrentMediaItemLength = 0;
     int mCurrentTime = 0;
     double mCurrentMediaItemProgress = 0;