Optimising the catalogue creation process

Author: zmoth

src/DataFlowGraphicsScene.cpp

@@ -100,25 +100,27 @@ createSceneMenu(QPointF const scenePos)
 
   auto registry = _graphModel.dataModelRegistry();
 
-  for (auto const& cat : registry->categories())
-  {
-    auto item = new QTreeWidgetItem(treeView);
-    item->setText(0, cat);
-    item->setFlags(item->flags() & ~Qt::ItemIsSelectable);
-  }
-
   for (auto const& assoc : registry->registeredModelsCategoryAssociation())
   {
-    QList<QTreeWidgetItem*> parent = treeView->findItems(assoc.second, 
-                                                         Qt::MatchExactly);
+    // A node must have a parent
+    QList<QTreeWidgetItem*> parentList;
+    parentList.clear();
+    parentList = treeView->findItems(assoc.second, Qt::MatchExactly);
 
-    if (parent.count() <= 0)
-      continue;
+    if (parentList.count() <= 0)
+    {
+      // Create a parent if it does not exist
+      auto parentItem = new QTreeWidgetItem(treeView);
+      parentItem->setText(0, assoc.second);
+      parentItem->setFlags(parentItem->flags() & ~Qt::ItemIsSelectable);
+      parentList.push_back(parentItem);
+    }
 
-    auto item = new QTreeWidgetItem(parent.first());
-    item->setText(0, assoc.first);
+    auto childItem = new QTreeWidgetItem(parentList.first());
+    childItem->setText(0, assoc.first);
   }
-
+  
+  treeView->sortByColumn(0, Qt::AscendingOrder);
   treeView->expandAll();
 
   connect(treeView, &QTreeWidget::itemClicked,