diff -r 2bdc3ac5e77c -r 55a55a9ec2c2 src/objecttypes/modelobject.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/objecttypes/modelobject.cpp	Sun Sep 22 11:51:41 2019 +0300
@@ -0,0 +1,81 @@
+#include "modelobject.h"
+
+static Uuid &getUuidForNewObject()
+{
+    static Uuid running_uuid {0, 0};
+    incrementUuid(running_uuid);
+    return running_uuid;
+}
+
+modelobjects::BaseObject::BaseObject() :
+    id {getUuidForNewObject()}
+{
+}
+
+modelobjects::BaseObject::~BaseObject()
+{
+}
+
+bool modelobjects::BaseObject::hasColor() const
+{
+	return false;
+}
+
+QVariant modelobjects::BaseObject::getProperty(Property id) const
+{
+	Q_UNUSED(id);
+	return {};
+}
+
+auto modelobjects::BaseObject::setProperty(Property id, const QVariant& value)
+	-> SetPropertyResult
+{
+	Q_UNUSED(id)
+	Q_UNUSED(value)
+	return SetPropertyResult::PropertyNotHandled;
+}
+
+modelobjects::ColoredBaseObject::ColoredBaseObject(const Color color_index) :
+	color_index{color_index}
+{
+}
+
+bool modelobjects::ColoredBaseObject::hasColor() const
+{
+	return true;
+}
+
+QVariant modelobjects::ColoredBaseObject::getProperty(Property id) const
+{
+	switch (id)
+	{
+	case Property::Color:
+		return color_index.index;
+	default:
+		return BaseObject::getProperty(id);
+	}
+}
+
+auto modelobjects::ColoredBaseObject::setProperty(Property id, const QVariant& value)
+	-> SetPropertyResult
+{
+	switch (id)
+	{
+	case Property::Color:
+		{
+			bool ok;
+			const int value_int = value.toInt(&ok);
+			if (ok)
+			{
+				color_index.index = value_int;
+				return SetPropertyResult::Success;
+			}
+			else
+			{
+				return SetPropertyResult::InvalidValue;
+			}
+		}
+	default:
+		return BaseObject::setProperty(id, value);
+	}
+}