Move another method to c++

python/gui/auto_generated/processing/models/qgsmodelcomponentgraphicitem.sip.in

@@ -78,6 +78,8 @@ Sets the ``font`` used to render text in the item.
 
     virtual void hoverLeaveEvent( QGraphicsSceneHoverEvent *event );
 
+    virtual QVariant itemChange( GraphicsItemChange change, const QVariant &value );
+
 
     QRectF itemRect() const;
 %Docstring

python/plugins/processing/modeler/ModelerGraphicItem.py

@@ -171,24 +171,6 @@ class ModelerGraphicItem(QgsModelComponentGraphicItem):
         else:
             return QPointF(0, 0)
 
-    def itemChange(self, change, value):
-        if change == QGraphicsItem.ItemPositionHasChanged:
-            self.updateArrowPaths.emit()
-            self.component().setPosition(self.pos())
-
-            # also need to update the model's stored component's position
-            if isinstance(self.component(), QgsProcessingModelChildAlgorithm):
-                self.model().childAlgorithm(self.component().childId()).setPosition(self.pos())
-            elif isinstance(self.component(), QgsProcessingModelParameter):
-                self.model().parameterComponent(self.component().parameterName()).setPosition(self.pos())
-            elif isinstance(self.component(), QgsProcessingModelOutput):
-                self.model().childAlgorithm(self.component().childId()).modelOutput(
-                    self.component().name()).setPosition(self.pos())
-        elif change == QGraphicsItem.ItemSelectedChange:
-            self.repaintArrows.emit()
-
-        return super().itemChange(change, value)
-
 
 class ModelerInputGraphicItem(ModelerGraphicItem):
 

src/gui/processing/models/qgsmodelcomponentgraphicitem.cpp

@@ -21,6 +21,7 @@
 #include "qgsmodelgraphicsscene.h"
 #include "qgsapplication.h"
 #include "qgsmodelgraphicitem.h"
+#include "qgsprocessingmodelalgorithm.h"
 #include <QSvgRenderer>
 #include <QPicture>
 #include <QPainter>
@@ -109,6 +110,39 @@ void QgsModelComponentGraphicItem::hoverLeaveEvent( QGraphicsSceneHoverEvent * )
   }
 }
 
+QVariant QgsModelComponentGraphicItem::itemChange( QGraphicsItem::GraphicsItemChange change, const QVariant &value )
+{
+  switch ( change )
+  {
+    case QGraphicsItem::ItemPositionHasChanged:
+    {
+      emit updateArrowPaths();
+      mComponent->setPosition( pos() );
+
+      // also need to update the model's stored component's position
+      // TODO - this is not so nice, consider moving this to model class
+      if ( QgsProcessingModelChildAlgorithm *child = dynamic_cast< QgsProcessingModelChildAlgorithm * >( mComponent.get() ) )
+        mModel->childAlgorithm( child->childId() ).setPosition( pos() );
+      else if ( QgsProcessingModelParameter *param = dynamic_cast< QgsProcessingModelParameter * >( mComponent.get() ) )
+        mModel->parameterComponent( param->parameterName() ).setPosition( pos() );
+      else if ( QgsProcessingModelOutput *output = dynamic_cast< QgsProcessingModelOutput * >( mComponent.get() ) )
+        mModel->childAlgorithm( output->childId() ).modelOutput( output->name() ).setPosition( pos() );
+
+      break;
+    }
+    case QGraphicsItem::ItemSelectedChange:
+    {
+      emit repaintArrows();
+      break;
+    }
+
+    default:
+      break;
+  }
+
+  return QGraphicsObject::itemChange( change, value );
+}
+
 QRectF QgsModelComponentGraphicItem::itemRect() const
 {
   return QRectF( -( mComponent->size().width() + 2 ) / 2.0,

src/gui/processing/models/qgsmodelcomponentgraphicitem.h

@@ -88,6 +88,7 @@ class GUI_EXPORT QgsModelComponentGraphicItem : public QGraphicsObject
     void hoverEnterEvent( QGraphicsSceneHoverEvent *event ) override;
     void hoverMoveEvent( QGraphicsSceneHoverEvent *event ) override;
     void hoverLeaveEvent( QGraphicsSceneHoverEvent *event ) override;
+    QVariant itemChange( GraphicsItemChange change, const QVariant &value ) override;
 
     /**
      * Returns the rectangle representing the body of the item.