Make wheel events on the analyzer change the volume. Fixes issue 3761

src/analyzers/analyzercontainer.cpp

@@ -123,7 +123,11 @@ void AnalyzerContainer::mouseDoubleClickEvent(QMouseEvent *) {
     visualisation_action_->trigger();
 }
 
-void AnalyzerContainer::SetEngine(EngineBase *engine) {
+void AnalyzerContainer::wheelEvent(QWheelEvent* e) {
+  emit WheelEvent(e->delta());
+}
+
+void AnalyzerContainer::SetEngine(EngineBase* engine) {
   if (current_analyzer_)
     current_analyzer_->set_engine(engine);
   engine_ = engine;

src/analyzers/analyzercontainer.h

@@ -37,9 +37,13 @@ public:
   static const char* kSettingsGroup;
   static const char* kSettingsFramerate;
 
+signals:
+  void WheelEvent(int delta);
+
 protected:
   void mouseReleaseEvent(QMouseEvent *);
   void mouseDoubleClickEvent(QMouseEvent *);
+  void wheelEvent(QWheelEvent* e);
 
 private slots:
   void ChangeAnalyzer(int id);

src/ui/mainwindow.cpp

@@ -634,6 +634,7 @@ MainWindow::MainWindow(Application* app,
   // Analyzer
   ui_->analyzer->SetEngine(app_->player()->engine());
   ui_->analyzer->SetActions(ui_->action_visualisations);
+  connect(ui_->analyzer, SIGNAL(WheelEvent(int)), SLOT(VolumeWheelEvent(int)));
 
   // Equalizer
   qLog(Debug) << "Creating equalizer";