ui: show tooltips when hovering nodes and edges

src/app/qt/view/QtGraphView.cpp

@@ -246,6 +246,9 @@ void QtGraphView::doRefreshView()
 
 	utility::setWidgetBackgroundColor(QtViewWidgetWrapper::getWidgetOfView(this), backgroundColor);
 	utility::setWidgetBackgroundColor(getView(), backgroundColor);
+
+	std::string css = utility::getStyleSheet("data/gui/graph_view/graph_view.css");
+	getView()->setStyleSheet(css.c_str());
 }
 
 std::shared_ptr<QtGraphNode> QtGraphView::findNodeRecursive(const std::list<std::shared_ptr<QtGraphNode>>& nodes, Id tokenId)

src/app/qt/view/graphElements/QtGraphEdge.cpp

@@ -117,6 +117,15 @@ void QtGraphEdge::updateLine()
 		}
 	}
 
+	if (m_data)
+	{
+		m_child->setToolTip(QString::fromStdString(m_data->getTypeString()));
+	}
+	else
+	{
+		m_child->setToolTip(QString::fromStdString(Edge::getTypeString(Edge::EDGE_AGGREGATION)));
+	}
+
 	this->setZValue(style.zValue); // Used to draw edges always on top of nodes.
 }
 

src/app/qt/view/graphElements/QtGraphNodeBundle.cpp

@@ -19,6 +19,8 @@ QtGraphNodeBundle::QtGraphNodeBundle(Id tokenId, size_t nodeCount, std::string n
 	m_circle->setNumber(nodeCount);
 
 	this->setAcceptHoverEvents(true);
+
+	this->setToolTip("bundle");
 }
 
 QtGraphNodeBundle::~QtGraphNodeBundle()

src/app/qt/view/graphElements/QtGraphNodeData.cpp

@@ -19,6 +19,8 @@ QtGraphNodeData::QtGraphNodeData(const Node* data, bool hasParent, bool childVis
 	{
 		this->setName(data->getName());
 	}
+
+	this->setToolTip(QString::fromStdString(data->getTypeString()));
 }
 
 QtGraphNodeData::~QtGraphNodeData()