started parameter editor

app/widget/nodeview/nodeview.cpp

@@ -29,6 +29,7 @@ NodeView::NodeView(QWidget *parent) :
   setDragMode(RubberBandDrag);
 
   connect(&scene_, SIGNAL(changed(const QList<QRectF>&)), this, SLOT(ItemsChanged()));
+  connect(&scene_, SIGNAL(selectionChanged()), this, SLOT(SceneSelectionChangedSlot()));
 }
 
 void NodeView::SetGraph(NodeGraph *graph)
@@ -149,3 +150,22 @@ void NodeView::ItemsChanged()
     }
   }
 }
+
+void NodeView::SceneSelectionChangedSlot()
+{
+  // Get the scene's selected items and convert it into a list of selected nodes
+  QList<QGraphicsItem*> selected_items = scene_.selectedItems();
+
+  QList<Node*> selected_nodes;
+
+  for (int i=0;i<selected_items.size();i++) {
+    // Try to dynamically cast to a widget holding a Node
+    NodeViewItem* item = dynamic_cast<NodeViewItem*>(selected_items.at(i));
+
+    if (item != nullptr) {
+      selected_nodes.append(item->node());
+    }
+  }
+
+  emit SelectionChanged(selected_nodes);
+}

app/widget/nodeview/nodeview.h

@@ -74,6 +74,12 @@ public:
    */
   NodeViewEdge* EdgeToUIObject(NodeEdgePtr n);
 
+signals:
+  /**
+   * @brief Signal emitted when the selected nodes have changed
+   */
+  void SelectionChanged(QList<Node*> selected_nodes);
+
 private:
   NodeGraph* graph_;
 
@@ -103,6 +109,11 @@ private slots:
    */
   void ItemsChanged();
 
+  /**
+   * @brief Receiver for when the scene's selected items change
+   */
+  void SceneSelectionChangedSlot();
+
 };
 
 #endif // NODEVIEW_H