ui: Added show definition context menu action for graph nodes (issue #83)

* use 'show definition' context menu action or 'Ctrl/Cmd + Left Click' to show definition of node in code

src/lib_gui/qt/view/graphElements/QtGraphNode.cpp

@@ -11,6 +11,7 @@
 #include "qt/utility/utilityQt.h"
 #include "qt/view/graphElements/nodeComponents/QtGraphNodeComponent.h"
 #include "qt/view/graphElements/QtGraphEdge.h"
+#include "utility/messaging/type/code/MessageCodeShowDefinition.h"
 #include "utility/messaging/type/MessageGraphNodeHide.h"
 #include "utility/messaging/type/MessageGraphNodeMove.h"
 #include "utility/ResourcePaths.h"
@@ -400,6 +401,20 @@ void QtGraphNode::onHide()
 	}
 }
 
+void QtGraphNode::onShowDefinition()
+{
+	Id tokenId = getTokenId();
+
+	if (tokenId)
+	{
+		MessageCodeShowDefinition(tokenId).dispatch();
+	}
+	else if (getParent())
+	{
+		getParent()->onShowDefinition();
+	}
+}
+
 void QtGraphNode::mousePressEvent(QGraphicsSceneMouseEvent* event)
 {
 	event->ignore();

src/lib_gui/qt/view/graphElements/QtGraphNode.h

@@ -98,6 +98,7 @@ public:
 
 	virtual void onClick();
 	virtual void onHide();
+	virtual void onShowDefinition();
 	virtual void moved(const Vec2i& oldPosition);
 
 	virtual void updateStyle() = 0;

src/lib_gui/qt/view/graphElements/nodeComponents/QtGraphNodeComponentClickable.cpp

@@ -39,6 +39,10 @@ void QtGraphNodeComponentClickable::nodeMouseReleaseEvent(QGraphicsSceneMouseEve
 		{
 			m_graphNode->onHide();
 		}
+		else if (event->modifiers() & Qt::ControlModifier)
+		{
+			m_graphNode->onShowDefinition();
+		}
 		else
 		{
 			m_graphNode->onClick();