paramview: implemented passthrough editing

app/widget/nodeview/nodeview.h

@@ -54,7 +54,16 @@ public:
 
   const QVector<Node*> &GetContexts() const
   {
-    return contexts_;
+    if (overlay_view_) {
+      return overlay_view_->GetContexts();
+    } else {
+      return contexts_;
+    }
+  }
+
+  bool IsGroupOverlay() const
+  {
+    return overlay_view_;
   }
 
   void CloseContextsBelongingToProject(Project *project);
@@ -109,7 +118,10 @@ signals:
 
   void NodesDeselected(const QVector<Node*>& nodes);
 
-  void NodeGroupOpenRequested(NodeGroup *group);
+  void NodeGroupOpened(NodeGroup *group);
+  void NodeGroupClosed();
+
+  void EscPressed();
 
 protected:
   virtual void keyPressEvent(QKeyEvent *event) override;
@@ -169,6 +181,8 @@ private:
 
   void PostPaste(const QVector<Node*> &new_nodes, const Node::PositionMap &map);
 
+  void ResizeOverlay();
+
   NodeViewMiniMap *minimap_;
 
   struct AttachedItem {
@@ -202,6 +216,8 @@ private:
 
   QMap<NodeViewItem*, QPointF> dragging_items_;
 
+  NodeView* overlay_view_;
+
   double scale_;
 
   static const double kMinimumScale;
@@ -252,6 +268,8 @@ private slots:
 
   void ItemAboutToBeDeleted(NodeViewItem *item);
 
+  void CloseOverlay();
+
 };
 
 }