refactored so sequence is again a derivative of viewer

app/widget/timebased/timebasedwidget.cpp

@@ -68,12 +68,12 @@ const int64_t &TimeBasedWidget::GetTimestamp() const
   return ruler_->GetTime();
 }
 
-Sequence *TimeBasedWidget::GetConnectedNode() const
+ViewerOutput *TimeBasedWidget::GetConnectedNode() const
 {
   return viewer_node_;
 }
 
-void TimeBasedWidget::ConnectViewerNode(Sequence *node)
+void TimeBasedWidget::ConnectViewerNode(ViewerOutput *node)
 {
   if (viewer_node_ == node) {
     return;
@@ -101,7 +101,7 @@ void TimeBasedWidget::ConnectViewerNode(Sequence *node)
   if (viewer_node_) {
     connect(viewer_node_, &ViewerOutput::LengthChanged, this, &TimeBasedWidget::UpdateMaximumScroll);
 
-    if ((points_ = ConnectTimelinePoints())) {
+    if ((points_ = GetTimelinePointsToConnect())) {
       ruler()->ConnectTimelinePoints(points_);
       scrollbar_->ConnectTimelinePoints(points_);
     }
@@ -242,9 +242,15 @@ void TimeBasedWidget::resizeEvent(QResizeEvent *event)
   UpdateMaximumScroll();
 }
 
-TimelinePoints *TimeBasedWidget::ConnectTimelinePoints()
+TimelinePoints *TimeBasedWidget::GetTimelinePointsToConnect()
 {
-  return viewer_node_->timeline_points();
+  Sequence* sequence = dynamic_cast<Sequence*>(viewer_node_);
+
+  if (sequence) {
+    return sequence->timeline_points();
+  }
+
+  return nullptr;
 }
 
 Project *TimeBasedWidget::GetTimelinePointsProject()

app/widget/timebased/timebasedwidget.h

@@ -46,9 +46,11 @@ public:
 
   void ZoomOut();
 
-  Sequence* GetConnectedNode() const;
+  ViewerOutput* GetConnectedNode() const;
 
-  void ConnectViewerNode(Sequence *node);
+  TimelinePoints* GetConnectedTimelinePoints() const;
+
+  void ConnectViewerNode(ViewerOutput *node);
 
   void SetScaleAndCenterOnPlayhead(const double& scale);
 
@@ -105,22 +107,20 @@ protected:
 
   virtual void ScaleChangedEvent(const double &) override;
 
-  virtual void ConnectedNodeChanged(Sequence*){}
+  virtual void ConnectedNodeChanged(ViewerOutput*){}
 
-  virtual void ConnectNodeInternal(Sequence*){}
+  virtual void ConnectNodeInternal(ViewerOutput*){}
 
-  virtual void DisconnectNodeInternal(Sequence*){}
+  virtual void DisconnectNodeInternal(ViewerOutput*){}
 
   void SetAutoMaxScrollBar(bool e);
 
   virtual void resizeEvent(QResizeEvent *event) override;
 
-  virtual TimelinePoints* ConnectTimelinePoints();
+  virtual TimelinePoints* GetTimelinePointsToConnect();
 
   virtual Project* GetTimelinePointsProject();
 
-  TimelinePoints* GetConnectedTimelinePoints() const;
-
   void ConnectTimelineView(TimeBasedView* base, bool connect_time_change_event = true);
 
   void PassWheelEventsToScrollBar(QObject* object);
@@ -189,7 +189,7 @@ private:
 
   bool UserIsDraggingPlayhead() const;
 
-  Sequence* viewer_node_;
+  ViewerOutput* viewer_node_;
 
   TimeRuler* ruler_;