Enable next button in Player

This functionality has safeguards built in, including a canGoNext
property.
This can be extended with streaming playing in the future.

src/audiomanager.cpp

@@ -164,6 +164,7 @@ QMediaPlayer::MediaStatus AudioManager::status() const
 void AudioManager::setEntry(Entry* entry)
 {
     if (entry != nullptr) {
+        // TODO: here is a good spot to check if the previous track was (nearly) finished, so it can be removed if needed
         qDebug() << "Going to change source";
         d->m_lockPositionSaving = true;
         d->m_entry = entry;
@@ -210,6 +211,7 @@ void AudioManager::setEntry(Entry* entry)
         Q_EMIT canPauseChanged();
         Q_EMIT canSkipForwardChanged();
         Q_EMIT canSkipBackwardChanged();
+        Q_EMIT canGoNextChanged();
         d->m_isSeekable = true;
         Q_EMIT seekableChanged(true);
     } else {
@@ -218,6 +220,7 @@ void AudioManager::setEntry(Entry* entry)
         Q_EMIT canPauseChanged();
         Q_EMIT canSkipForwardChanged();
         Q_EMIT canSkipBackwardChanged();
+        Q_EMIT canGoNextChanged();
         d->m_isSeekable = false;
         Q_EMIT seekableChanged(false);
     }
@@ -319,9 +322,45 @@ void AudioManager::skipBackward()
     seek(std::max((qint64)0, (position() - SKIP_STEP)));
 }
 
+bool AudioManager::canGoNext() const
+{
+    int index = DataManager::instance().getQueue().indexOf(d->m_entry->id());
+    if (index >= 0) {
+        // check if there is a next track
+        if (index < DataManager::instance().getQueue().count()-1) {
+            Entry* next_entry = DataManager::instance().getEntry(DataManager::instance().getQueue()[index+1]);
+            if (next_entry->enclosure()) {
+                if (next_entry->enclosure()->status() == Enclosure::Downloaded) {
+                    return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+void AudioManager::next()
+{
+    QMediaPlayer::State currentState = playbackState();
+    // TODO: needs to be more complicated; what if track has not been downloaded and streaming is not allowed; probably needs a canGoNext routine
+    // go to next track in playlist
+    int index = DataManager::instance().getQueue().indexOf(d->m_entry->id());
+    if (canGoNext()) {
+        setEntry(DataManager::instance().getEntry(DataManager::instance().getQueue()[index+1]));
+        if (currentState == QMediaPlayer::PlayingState) play();
+    } else {
+        setEntry(nullptr);
+    }
+}
+
 void AudioManager::mediaStatusChanged()
 {
     qDebug() << "AudioManager::mediaStatusChanged" << d->m_player.mediaStatus();
+
+    // File has reached the end and has stopped
+    if (d->m_player.mediaStatus() == QMediaPlayer::EndOfMedia) {
+
+    }
 }
 
 void AudioManager::playerStateChanged()

src/audiomanager.h

@@ -81,6 +81,10 @@ class AudioManager : public QObject
                READ seekable
                NOTIFY seekableChanged)
 
+    Q_PROPERTY(bool canGoNext
+               READ canGoNext
+               NOTIFY canGoNextChanged)
+
 public:
 
     explicit AudioManager(QObject *parent = nullptr);
@@ -129,6 +133,8 @@ public:
 
     [[nodiscard]] bool canSkipBackward() const;
 
+    [[nodiscard]] bool canGoNext() const;
+
 Q_SIGNALS:
 
     void playerOpenChanged(bool state);
@@ -169,6 +175,8 @@ Q_SIGNALS:
 
     void canSkipBackwardChanged();
 
+    void canGoNextChanged();
+
 public Q_SLOTS:
 
     void setEntry(Entry* entry);
@@ -199,6 +207,8 @@ public Q_SLOTS:
 
     void skipForward();
 
+    void next();
+
 private Q_SLOTS:
 
     void mediaStatusChanged();

src/enclosure.cpp

@@ -130,6 +130,11 @@ QString Enclosure::path() const
     return Fetcher::instance().enclosurePath(m_url);
 }
 
+Enclosure::Status Enclosure::status() const
+{
+    return m_status;
+}
+
 qint64 Enclosure::playPosition() const{
     return m_playposition;
 }

src/enclosure.h

@@ -23,7 +23,7 @@ class Enclosure : public QObject
     Q_PROPERTY(QString title MEMBER m_title CONSTANT)
     Q_PROPERTY(QString type MEMBER m_type CONSTANT)
     Q_PROPERTY(QString url MEMBER m_url CONSTANT)
-    Q_PROPERTY(Status status MEMBER m_status NOTIFY statusChanged)
+    Q_PROPERTY(Status status READ status NOTIFY statusChanged)
     Q_PROPERTY(double downloadProgress MEMBER m_downloadProgress NOTIFY downloadProgressChanged)
     Q_PROPERTY(QString path READ path CONSTANT)
     Q_PROPERTY(qint64 playPosition READ playPosition WRITE setPlayPosition NOTIFY playPositionChanged)
@@ -43,8 +43,8 @@ public:
     Q_INVOKABLE void deleteFile();
 
     QString path() const;
+    Status status() const;
     qint64 playPosition() const;
-
     void setPlayPosition(const qint64 &position);
 
 Q_SIGNALS:

src/qml/PlayerControls.qml

@@ -199,7 +199,8 @@ Kirigami.Page {
                         icon.width: parent.buttonsize
                         flat: true
                         Layout.alignment: Qt.AlignHCenter
-                        onClicked: console.log("Next track to be implemented")
+                        onClicked: audio.next()
+                        enabled: audio.canGoNext
                     }
                 }
             }