Update mute button in tray icon

src/ui/mainwindow.cpp

@@ -899,6 +899,7 @@ void MainWindow::MediaPlaying() {
 
 void MainWindow::VolumeChanged(int volume) {
   ui_->action_mute->setChecked(!volume);
+  tray_icon_->MuteButtonStateChanged(!volume);
 }
 
 void MainWindow::SongChanged(const Song& song) {

src/ui/qtsystemtrayicon.cpp

@@ -35,6 +35,7 @@ QtSystemTrayIcon::QtSystemTrayIcon(QObject* parent)
     action_play_pause_(NULL),
     action_stop_(NULL),
     action_stop_after_this_track_(NULL),
+    action_mute_(NULL),
     action_love_(NULL),
     action_ban_(NULL)
 {
@@ -111,7 +112,9 @@ void QtSystemTrayIcon::SetupMenu(
   menu_->addAction(next->icon(), next->text(), next, SLOT(trigger()));
 
   menu_->addSeparator();
-  menu_->addAction(mute->icon(), mute->text(), mute, SLOT(trigger()));
+  action_mute_ = menu_->addAction(mute->icon(), mute->text(), mute, SLOT(trigger()));
+  action_mute_->setCheckable(true);
+  action_mute_->setChecked(mute->isChecked());
 
   menu_->addSeparator();
 #ifdef HAVE_LIBLASTFM
@@ -215,6 +218,10 @@ void QtSystemTrayIcon::LastFMButtonBanStateChanged(bool value) {
 #endif
 }
 
+void QtSystemTrayIcon::MuteButtonStateChanged(bool value) {
+  if (action_mute_)
+    action_mute_->setChecked(value);
+}
 
 bool QtSystemTrayIcon::IsVisible() const {
   return tray_->isVisible();

src/ui/qtsystemtrayicon.h

@@ -50,6 +50,7 @@ protected:
   void LastFMButtonVisibilityChanged(bool value);
   void LastFMButtonLoveStateChanged(bool value);
   void LastFMButtonBanStateChanged(bool value);
+  void MuteButtonStateChanged(bool value);
 
   // QObject
   bool eventFilter(QObject *, QEvent *);
@@ -63,6 +64,7 @@ private:
   QAction* action_play_pause_;
   QAction* action_stop_;
   QAction* action_stop_after_this_track_;
+  QAction* action_mute_;
   QAction* action_love_;
   QAction* action_ban_;
 

src/ui/systemtrayicon.h

@@ -59,6 +59,7 @@ class SystemTrayIcon : public QObject {
   virtual void LastFMButtonVisibilityChanged(bool value) {}
   virtual void LastFMButtonLoveStateChanged(bool value) {}
   virtual void LastFMButtonBanStateChanged(bool value) {}
+  virtual void MuteButtonStateChanged(bool value) {}
 
  signals:
   void ChangeVolume(int delta);