constructed keyframeview and timeruler together inside nodeparamview and connected them

app/panel/param/param.cpp

@@ -33,6 +33,16 @@ ParamPanel::ParamPanel(QWidget* parent) :
   Retranslate();
 }
 
+void ParamPanel::ZoomIn()
+{
+  view_->SetScale(view_->GetScale() * 2);
+}
+
+void ParamPanel::ZoomOut()
+{
+  view_->SetScale(view_->GetScale() * 0.5);
+}
+
 void ParamPanel::SetNodes(QList<Node *> nodes)
 {
   view_->SetNodes(nodes);

app/panel/param/param.h

@@ -30,11 +30,15 @@ class ParamPanel : public PanelWidget
 public:
   ParamPanel(QWidget* parent);
 
+  virtual void ZoomIn() override;
+
+  virtual void ZoomOut() override;
+
 public slots:
   void SetNodes(QList<Node*> nodes);
 
 protected:
-  virtual void changeEvent(QEvent* e);
+  virtual void changeEvent(QEvent* e) override;
 
 private:
   void Retranslate();