diff -r 40e2940605a3 -r 4bec0525ef1b src/linetypes/object.cpp
--- a/src/linetypes/object.cpp	Wed Mar 18 17:11:23 2020 +0200
+++ b/src/linetypes/object.cpp	Thu Mar 19 21:06:06 2020 +0200
@@ -29,12 +29,20 @@
 	return {};
 }
 
-auto ldraw::Object::setProperty(Property id, const QVariant& value)
-	-> SetPropertyResult
+void ldraw::Object::setProperty(SetPropertyResult* result, const PropertyKeyValue& pair)
 {
-	Q_UNUSED(id)
-	Q_UNUSED(value)
-	return SetPropertyResult::PropertyNotHandled;
+	Q_UNUSED(result)
+	Q_UNUSED(pair)
+}
+
+/**
+ * @brief public interface to setProperty
+ */
+ldraw::Object::SetPropertyResult ldraw::Object::setProperty(const PropertyKeyValue& pair)
+{
+	SetPropertyResult result;
+	this->setProperty(&result, pair);
+	return result;
 }
 
 QBrush ldraw::Object::textRepresentationForeground() const
@@ -60,6 +68,7 @@
 
 const glm::vec3& ldraw::Object::getPoint(int index) const
 {
+	Q_UNUSED(index);
 	throw BadPointIndex{};
 }
 
@@ -84,28 +93,10 @@
 	}
 }
 
-auto ldraw::ColoredObject::setProperty(Property id, const QVariant& value)
-	-> SetPropertyResult
+void ldraw::ColoredObject::setProperty(SetPropertyResult* result, const PropertyKeyValue& pair)
 {
-	switch (id)
-	{
-	case Property::Color:
-		{
-			bool ok;
-			const int value_int = value.toInt(&ok);
-			if (ok)
-			{
-				colorIndex.index = value_int;
-				return SetPropertyResult::Success;
-			}
-			else
-			{
-				return SetPropertyResult::InvalidValue;
-			}
-		}
-	default:
-		return Object::setProperty(id, value);
-	}
+	LDRAW_OBJECT_HANDLE_SET_PROPERTY(Color, {colorIndex.index = value;});
+	Object::setProperty(result, pair);
 }
 
 QString ldraw::Empty::textRepresentation() const