MainWindow: Add function to display progress on taskbar

src/core/mainwindow.cpp

@@ -73,6 +73,10 @@
 #include <QToolButton>
 #include <QCheckBox>
 #include <QClipboard>
+#ifdef HAVE_DBUS
+#  include <QDBusConnection>
+#  include <QDBusMessage>
+#endif
 
 #include "core/logging.h"
 
@@ -1269,6 +1273,11 @@ void MainWindow::Exit() {
         return;  // Don't quit the application now: wait for the fadeout finished signal
       }
     }
+
+#ifdef HAVE_DBUS
+    UpdateTaskbarProgress(false, 0, 0);
+#endif
+
     DoExit();
   }
 
@@ -1321,6 +1330,10 @@ void MainWindow::MediaStopped() {
   tray_icon_->SetProgress(0);
   tray_icon_->SetStopped();
 
+#ifdef HAVE_DBUS
+  UpdateTaskbarProgress(false, 0, 0);
+#endif
+
   song_playing_ = Song();
   song_ = Song();
   album_cover_ = AlbumCoverImageResult();
@@ -1397,6 +1410,10 @@ void MainWindow::SongChanged(const Song &song) {
   setWindowTitle(song.PrettyTitleWithArtist());
   tray_icon_->SetProgress(0);
 
+#ifdef HAVE_DBUS
+  UpdateTaskbarProgress(false, 0, 0);
+#endif
+
   SendNowPlaying();
 
   const bool enable_change_art = song.is_collection_song() && !song.effective_albumartist().isEmpty() && !song.album().isEmpty();
@@ -1686,6 +1703,10 @@ void MainWindow::Seeked(const qint64 microseconds) {
   const qint64 length = app_->player()->GetCurrentItem()->Metadata().length_nanosec() / kNsecPerSec;
   tray_icon_->SetProgress(static_cast<int>(static_cast<double>(position) / static_cast<double>(length) * 100.0));
 
+#ifdef HAVE_DBUS
+  UpdateTaskbarProgress(true, position, length);
+#endif
+
 }
 
 void MainWindow::UpdateTrackPosition() {
@@ -1700,6 +1721,10 @@ void MainWindow::UpdateTrackPosition() {
   // Update the tray icon every 10 seconds
   if (position % 10 == 0) tray_icon_->SetProgress(static_cast<int>(static_cast<double>(position) / static_cast<double>(length) * 100.0));
 
+#ifdef HAVE_DBUS
+  UpdateTaskbarProgress(true, position, length);
+#endif
+
   // Send Scrobble
   if (app_->scrobbler()->enabled() && item->Metadata().is_metadata_good()) {
     Playlist *playlist = app_->playlist_manager()->active();
@@ -1726,6 +1751,21 @@ void MainWindow::UpdateTrackSliderPosition() {
 
 }
 
+#ifdef HAVE_DBUS
+void MainWindow::UpdateTaskbarProgress(const bool visible, const double position, const double length) {
+
+  QVariantMap map;
+  QDBusMessage msg = QDBusMessage::createSignal(QStringLiteral("/org/strawberrymusicplayer/strawberry"), QStringLiteral("com.canonical.Unity.LauncherEntry"), QStringLiteral("Update"));
+
+  map.insert(QStringLiteral("progress-visible"), visible);
+  map.insert(QStringLiteral("progress"), position / length);
+  msg << QString("application://org.strawberrymusicplayer.strawberry.desktop") << map;
+
+  QDBusConnection::sessionBus().send(msg);
+
+}
+#endif
+
 void MainWindow::ApplyAddBehaviour(const BehaviourSettingsPage::AddBehaviour b, MimeData *mimedata) {
 
   switch (b) {

src/core/mainwindow.h

@@ -290,6 +290,10 @@ class MainWindow : public QMainWindow, public PlatformInterface {
 
   void SetToggleScrobblingIcon(const bool value);
 
+#ifdef HAVE_DBUS
+  void UpdateTaskbarProgress(const bool visible, const double position, const double length);
+#endif
+
  private:
   Ui_MainWindow *ui_;
 #ifdef Q_OS_WIN