Show a tiny play or pause icon in the system tray

data/data.qrc

@@ -79,5 +79,7 @@
         <file>list-add.png</file>
         <file>document-save.png</file>
         <file>schema-7.sql</file>
+        <file>tiny-pause.png</file>
+        <file>tiny-start.png</file>
     </qresource>
 </RCC>

src/mainwindow.cpp

@@ -491,6 +491,7 @@ void MainWindow::MediaStopped() {
   track_slider_->SetStopped();
 #ifndef Q_OS_DARWIN
   tray_icon_->SetProgress(0);
+  tray_icon_->SetStopped();
 #endif
 }
 
@@ -503,6 +504,10 @@ void MainWindow::MediaPaused() {
   ui_.action_play_pause->setEnabled(true);
 
   track_position_timer_->stop();
+
+#ifndef Q_OS_DARWIN
+  tray_icon_->SetPaused();
+#endif
 }
 
 void MainWindow::MediaPlaying() {
@@ -524,6 +529,10 @@ void MainWindow::MediaPlaying() {
 
   track_position_timer_->start();
   UpdateTrackPosition();
+
+#ifndef Q_OS_DARWIN
+  tray_icon_->SetPlaying();
+#endif
 }
 
 void MainWindow::ScrobblingEnabledChanged(bool value) {

src/systemtrayicon.cpp

@@ -24,7 +24,10 @@
 #include <cmath>
 
 SystemTrayIcon::SystemTrayIcon(QObject* parent)
-  : QSystemTrayIcon(parent)
+  : QSystemTrayIcon(parent),
+    playing_icon_(":/tiny-start.png"),
+    paused_icon_(":/tiny-pause.png"),
+    percentage_(0)
 {
 }
 
@@ -39,6 +42,11 @@ bool SystemTrayIcon::event(QEvent* event) {
 }
 
 void SystemTrayIcon::SetProgress(int percentage) {
+  percentage_ = percentage;
+  Update();
+}
+
+void SystemTrayIcon::Update() {
   if (icon_.isNull()) {
     icon_ = icon().pixmap(geometry().size(), QIcon::Normal);
     grey_icon_ = icon().pixmap(geometry().size(), QIcon::Disabled);
@@ -51,7 +59,7 @@ void SystemTrayIcon::SetProgress(int percentage) {
 
   // The angle of the line that's used to cover the icon.
   // Centered on rect.topRight()
-  double angle = double(100 - percentage) / 100.0 * M_PI_2 + M_PI;
+  double angle = double(100 - percentage_) / 100.0 * M_PI_2 + M_PI;
   double length = sqrt(pow(rect.width(), 2.0) + pow(rect.height(), 2.0));
 
   QPolygon mask;
@@ -60,7 +68,7 @@ void SystemTrayIcon::SetProgress(int percentage) {
       length * sin(angle),
       - length * cos(angle));
 
-  if (percentage > 50)
+  if (percentage_ > 50)
     mask << rect.bottomLeft();
 
   mask << rect.topLeft();
@@ -68,9 +76,37 @@ void SystemTrayIcon::SetProgress(int percentage) {
 
   QPixmap icon(icon_);
   QPainter p(&icon);
+
+  // Draw the grey bit over the orange icon
   p.setClipRegion(mask);
   p.drawPixmap(0, 0, grey_icon_);
+  p.setClipping(false);
+
+  // Draw the playing or paused icon in the top-right
+  if (!current_state_icon_.isNull()) {
+    int height = rect.height() / 2;
+    QPixmap scaled(current_state_icon_.scaledToHeight(height, Qt::SmoothTransformation));
+
+    QRect state_rect(rect.width() - scaled.width(), 0, scaled.width(), scaled.height());
+    p.drawPixmap(state_rect, scaled);
+  }
+
   p.end();
 
   setIcon(icon);
 }
+
+void SystemTrayIcon::SetPaused() {
+  current_state_icon_ = paused_icon_;
+  Update();
+}
+
+void SystemTrayIcon::SetPlaying() {
+  current_state_icon_ = playing_icon_;
+  Update();
+}
+
+void SystemTrayIcon::SetStopped() {
+  current_state_icon_ = QPixmap();
+  Update();
+}

src/systemtrayicon.h

@@ -30,13 +30,23 @@ class SystemTrayIcon : public QSystemTrayIcon {
 
  public slots:
   void SetProgress(int percentage);
+  void SetPaused();
+  void SetPlaying();
+  void SetStopped();
 
  signals:
   void WheelEvent(int delta);
 
  private:
+  void Update();
+
   QPixmap icon_;
   QPixmap grey_icon_;
+  QPixmap playing_icon_;
+  QPixmap paused_icon_;
+
+  int percentage_;
+  QPixmap current_state_icon_;
 };
 
 #endif // SYSTEMTRAYICON_H