Modifications to allow custom context menus on node objects (paceholder#112)

* Modifications to allow custom context menus on node objects

* Added position of ContextMenuEvent in signal

Author: tuvok

src/FlowScene.hpp

@@ -112,6 +112,8 @@ class NODE_EDITOR_PUBLIC FlowScene
 
   void nodeHoverLeft(Node& n);
 
+  void nodeContextMenu(Node& n, const QPointF& pos);
+
 private:
 
   using SharedConnection = std::shared_ptr<Connection>;

src/FlowView.cpp

@@ -83,6 +83,12 @@ void
 FlowView::
 contextMenuEvent(QContextMenuEvent *event)
 {
+  if (itemAt(event->pos()))
+  {
+    QGraphicsView::contextMenuEvent(event);
+    return;
+  }
+
   QMenu modelMenu;
 
   auto skipText = QStringLiteral("skip me");

src/NodeGraphicsObject.cpp

@@ -65,6 +65,7 @@ NodeGraphicsObject(FlowScene &scene,
   };
   connect(this, &QGraphicsObject::xChanged, this, onMoveSlot);
   connect(this, &QGraphicsObject::yChanged, this, onMoveSlot);
+
 }
 
 
@@ -401,3 +402,10 @@ mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event)
 
   _scene.nodeDoubleClicked(node());
 }
+
+void
+NodeGraphicsObject::
+contextMenuEvent(QGraphicsSceneContextMenuEvent* event)
+{
+  _scene.nodeContextMenu(node(), mapToScene(event->pos()));
+}

src/NodeGraphicsObject.hpp

@@ -84,6 +84,9 @@ class NodeGraphicsObject : public QGraphicsObject
   void
   mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) override;
 
+  void
+  contextMenuEvent(QGraphicsSceneContextMenuEvent* event) override;
+
 private:
   void
   embedQWidget();