logic: Show inheritance edges between parents of active symbol and other visible symbols (issue #167)

* add inheritance edges between parents of active symbol and other visible symbols
* add dashed inheritance edges when symbols are no direct decendants
* inheritance edges are also respected in layouting, putting base/derived classes in the correct top/bottom spot now

bug id = 167

src/lib/data/graph/Edge.cpp

@@ -4,6 +4,7 @@
 
 #include "data/graph/Node.h"
 #include "data/graph/token_component/TokenComponentAggregation.h"
+#include "data/graph/token_component/TokenComponentInheritanceChain.h"
 #include "utility/logging/logging.h"
 #include "utility/utilityString.h"
 
@@ -134,6 +135,22 @@ void Edge::addComponentAggregation(std::shared_ptr<TokenComponentAggregation> co
 	}
 }
 
+void Edge::addComponentInheritanceChain(std::shared_ptr<TokenComponentInheritanceChain> component)
+{
+	if (getComponent<TokenComponentInheritanceChain>())
+	{
+		LOG_ERROR("TokenComponentInheritanceChain has been set before!");
+	}
+	else if (m_type != EDGE_INHERITANCE)
+	{
+		LOG_ERROR("TokenComponentInheritanceChain can't be set on edge of type: " + getReadableTypeString());
+	}
+	else
+	{
+		addComponent(component);
+	}
+}
+
 std::string Edge::getUnderscoredTypeString(EdgeType type)
 {
 	return utility::replace(utility::replace(getReadableTypeString(type), "-", "_"), " ", "_");