constructed keyframeview and timeruler together inside nodeparamview and connected them

app/node/node.h

@@ -202,6 +202,12 @@ public:
    */
   void DisconnectAll();
 
+  template<class T>
+  /**
+   * @brief Find a node of a certain type that this Node outputs to
+   */
+  const T* FindOutputNode() const;
+
   /**
    * @brief Convert a pointer to a value that can be sent between NodeParams
    */
@@ -385,4 +391,29 @@ T* Node::ValueToPtr(const QVariant &ptr)
   return reinterpret_cast<T*>(ptr.value<quintptr>());
 }
 
+template<class T>
+const Node* FindOutputNodeInternal(const Node* n) {
+  foreach (NodeEdgePtr edge, n->output()->edges()) {
+    Node* connected = edge->input()->parentNode();
+    T* cast_test = dynamic_cast<T*>(connected);
+
+    if (cast_test) {
+      return cast_test;
+    } else {
+      const Node* drill_test = FindOutputNodeInternal<T>(connected);
+      if (drill_test) {
+        return drill_test;
+      }
+    }
+  }
+
+  return nullptr;
+}
+
+template<class T>
+const T* Node::FindOutputNode() const
+{
+  return static_cast<const T*>(FindOutputNodeInternal<T>(this));
+}
+
 #endif // NODE_H

app/node/output/viewer/viewer.cpp

@@ -93,12 +93,12 @@ void ViewerOutput::InvalidateCache(const rational &start_range, const rational &
   SendInvalidateCache(start_range, end_range);
 }
 
-const VideoParams &ViewerOutput::video_params()
+const VideoParams &ViewerOutput::video_params() const
 {
   return video_params_;
 }
 
-const AudioParams &ViewerOutput::audio_params()
+const AudioParams &ViewerOutput::audio_params() const
 {
   return audio_params_;
 }

app/node/output/viewer/viewer.h

@@ -51,8 +51,8 @@ public:
 
   virtual void InvalidateCache(const rational &start_range, const rational &end_range, NodeInput *from = nullptr) override;
 
-  const VideoParams& video_params();
-  const AudioParams& audio_params();
+  const VideoParams& video_params() const;
+  const AudioParams& audio_params() const;
 
   void set_video_params(const VideoParams& video);
   void set_audio_params(const AudioParams& audio);