Handle cases where playlist background album gets stuck on error

src/playlist/playlistview.cpp

@@ -69,6 +69,7 @@
 #include "core/player.h"
 #include "core/qt_blurimage.h"
 #include "core/song.h"
+#include "playlistmanager.h"
 #include "playlist.h"
 #include "playlistdelegates.h"
 #include "playlistheader.h"
@@ -216,11 +217,11 @@ void PlaylistView::SetApplication(Application *app) {
 
   Q_ASSERT(app);
   app_ = app;
-  connect(app_->current_albumcover_loader(), SIGNAL(AlbumCoverLoaded(const Song&, const QUrl&, const QImage&)), SLOT(CurrentSongChanged(const Song&, const QUrl&, const QImage&)));
-  connect(app_->player(), SIGNAL(Paused()), SLOT(StopGlowing()));
+  connect(app_->playlist_manager(), SIGNAL(CurrentSongChanged(const Song&)), this, SLOT(SongChanged(const Song&)));
+  connect(app_->current_albumcover_loader(), SIGNAL(AlbumCoverLoaded(const Song&, const QUrl&, const QImage&)), SLOT(AlbumCoverLoaded(const Song&, const QUrl&, const QImage&)));
   connect(app_->player(), SIGNAL(Playing()), SLOT(StartGlowing()));
-  connect(app_->player(), SIGNAL(Stopped()), SLOT(StopGlowing()));
-  connect(app_->player(), SIGNAL(Stopped()), SLOT(PlayerStopped()));
+  connect(app_->player(), SIGNAL(Paused()), SLOT(StopGlowing()));
+  connect(app_->player(), SIGNAL(Stopped()), SLOT(Stopped()));
 
 }
 
@@ -502,24 +503,30 @@ void PlaylistView::GlowIntensityChanged() {
 }
 
 void PlaylistView::StopGlowing() {
+
   currently_glowing_ = false;
   glow_timer_.stop();
   glow_intensity_step_ = kGlowIntensitySteps;
+
 }
 
 void PlaylistView::StartGlowing() {
+
   currently_glowing_ = true;
   if (isVisible() && glow_enabled_)
     glow_timer_.start(1500 / kGlowIntensitySteps, this);
+
 }
 
 void PlaylistView::hideEvent(QHideEvent *) { glow_timer_.stop(); }
 
 void PlaylistView::showEvent(QShowEvent *) {
+
   if (currently_glowing_ && glow_enabled_)
     glow_timer_.start(1500 / kGlowIntensitySteps, this);
 
   MaybeAutoscroll();
+
 }
 
 bool CompareSelectionRanges(const QItemSelectionRange &a, const QItemSelectionRange &b) {
@@ -1214,9 +1221,24 @@ void PlaylistView::CopyCurrentSongToClipboard() const {
 
 }
 
-void PlaylistView::CurrentSongChanged(const Song &song, const QUrl &cover_url, const QImage &song_art) {
+void PlaylistView::SongChanged(const Song &song) {
+  song_playing_ = song;
+}
 
-  if (current_song_cover_art_ == song_art) return;
+void PlaylistView::Playing() {}
+
+void PlaylistView::Stopped() {
+
+  if (song_playing_ == Song()) return;
+  song_playing_ = Song();
+  StopGlowing();
+  AlbumCoverLoaded(Song(), QUrl(), QImage());
+
+}
+
+void PlaylistView::AlbumCoverLoaded(const Song &song, const QUrl &cover_url, const QImage &song_art) {
+
+  if ((song != Song() && song_playing_ == Song()) || song_art == current_song_cover_art_) return;
 
   current_song_cover_art_ = song_art;
   if (background_image_type_ == AppearanceSettingsPage::BackgroundImageType_Album) {
@@ -1284,10 +1306,6 @@ void PlaylistView::FadePreviousBackgroundImage(qreal value) {
 
 }
 
-void PlaylistView::PlayerStopped() {
-  CurrentSongChanged(Song(), QUrl(), QImage());
-}
-
 void PlaylistView::focusInEvent(QFocusEvent *event) {
 
   QTreeView::focusInEvent(event);

src/playlist/playlistview.h

@@ -50,6 +50,7 @@
 #include <QStyleOptionViewItem>
 #include <QtEvents>
 
+#include "core/song.h"
 #include "settings/appearancesettingspage.h"
 #include "playlist.h"
 
@@ -68,7 +69,6 @@ class QPaintEvent;
 class QTimerEvent;
 
 class Application;
-class Song;
 class CollectionBackend;
 class PlaylistHeader;
 
@@ -119,16 +119,8 @@ class PlaylistView : public QTreeView {
   void ReloadSettings();
   void SaveGeometry();
   void SaveSettings();
-  void StopGlowing();
-  void StartGlowing();
-  void JumpToCurrentlyPlayingTrack();
-  void JumpToLastPlayedTrack();
-  void closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint);
   void SetColumnAlignment(int section, Qt::Alignment alignment);
-
-  void CopyCurrentSongToClipboard() const;
-  void CurrentSongChanged(const Song &new_song, const QUrl &cover_url, const QImage &song_art);
-  void PlayerStopped();
+  void JumpToCurrentlyPlayingTrack();
 
  signals:
   void PlayItem(const QModelIndex &index);
@@ -155,7 +147,6 @@ class PlaylistView : public QTreeView {
   void dragEnterEvent(QDragEnterEvent *event);
   void dragLeaveEvent(QDragLeaveEvent *event);
   void dropEvent(QDropEvent *event);
-  //void resizeEvent(QResizeEvent *event);
   bool eventFilter(QObject *object, QEvent *event);
   void focusInEvent(QFocusEvent *event);
 
@@ -164,18 +155,26 @@ class PlaylistView : public QTreeView {
 
   // QAbstractItemView
   void rowsInserted(const QModelIndex &parent, int start, int end);
+  void closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint);
 
  private slots:
-  void LoadGeometry();
-  void GlowIntensityChanged();
   void InhibitAutoscrollTimeout();
   void MaybeAutoscroll();
   void InvalidateCachedCurrentPixmap();
   void PlaylistDestroyed();
   void StretchChanged(bool stretch);
   void FadePreviousBackgroundImage(qreal value);
+  void StopGlowing();
+  void StartGlowing();
+  void JumpToLastPlayedTrack();
+  void CopyCurrentSongToClipboard() const;
+  void Playing();
+  void Stopped();
+  void SongChanged(const Song &song);
+  void AlbumCoverLoaded(const Song &new_song, const QUrl &cover_url, const QImage &song_art);
 
  private:
+  void LoadGeometry();
   void ReloadBarPixmaps();
   QList<QPixmap> LoadBarPixmap(const QString &filename);
   void UpdateCachedCurrentRowPixmap(QStyleOptionViewItem option, const QModelIndex &index);
@@ -188,6 +187,8 @@ class PlaylistView : public QTreeView {
   // Should be used instead of modifying background_image_ directly
   void set_background_image(const QImage &image);
 
+  void GlowIntensityChanged();
+
  private:
   static const int kGlowIntensitySteps;
   static const int kAutoscrollGraceTimeout;
@@ -268,6 +269,8 @@ class PlaylistView : public QTreeView {
 
   QByteArray state_;
 
+  Song song_playing_;
+
 };
 
 #endif  // PLAYLISTVIEW_H