Terminal strip Xref is clickable

When user hover the Xref string of a terminal, the string color change
to blue to advise user the xref is clickable. Double click on the blue
Xref go the folio of the terminal and zoom the view to the terminal.

sources/TerminalStrip/GraphicsItem/terminalstripdrawer.cpp

@@ -45,6 +45,7 @@ void TerminalStripDrawer::paint(QPainter *painter)
 {
     if (m_strip && m_pattern)
     {
+		m_united_xref_text_rect = QRectF();
             //To draw text, QPainter need a Qrect. Instead of create an instance
             //for each text, we re-use the same instance of QRect.
         QRect text_rect;
@@ -91,11 +92,10 @@ void TerminalStripDrawer::paint(QPainter *painter)
 
         const auto text_{m_strip->installation() + " " + m_strip->location() + " " + m_strip->name()};
         painter->drawText(text_rect, text_, m_pattern->headerTextOption());
-        painter->restore();
+		painter->restore();
 
             //Move painter pos to next drawing
         painter->translate(m_pattern->m_header_rect.width(),0);
-
         qreal x_offset{m_pattern->m_header_rect.width()};
 
             //Draw spacer
@@ -120,6 +120,8 @@ void TerminalStripDrawer::paint(QPainter *painter)
 
         QHash<QUuid, QVector<QPointF>> bridges_anchor_points;
 
+		m_hovered_xref = hoverTerminal{};
+		int physical_index = 0;
             //Loop over physical terminals
         for (const auto &physical_t : m_strip->physicalTerminal())
         {
@@ -190,15 +192,40 @@ void TerminalStripDrawer::paint(QPainter *painter)
                 painter->restore();
 
 					//Draw xref
-				auto xref_string = shared_real_terminal->xref();
-				painter->save();
 				xref_rect.setRect(0, xref_text_y, terminal_rect.width(), xref_text_height);
+				painter->save();
 				if (xref_text_orientation == Qt::Vertical)
 				{
 					painter->translate(xref_rect.bottomLeft());
 					painter->rotate(270);
 					xref_rect.setRect(0, 0, xref_rect.height(), xref_rect.width());
 				}
+
+				QTransform transform;
+				transform.translate(x_offset, 0);
+
+				if (xref_text_orientation == Qt::Vertical)
+				{
+					transform.translate(0, xref_text_y + xref_text_height);
+					transform.rotate(270);
+				}
+
+				auto xref_string = shared_real_terminal->xref();
+
+				const auto mapped_xref_text_rect = transform.mapRect(painter->boundingRect(xref_rect, xref_string, xref_text_option));
+				if (m_united_xref_text_rect.isNull()) {
+					m_united_xref_text_rect = mapped_xref_text_rect;
+				} else {
+					m_united_xref_text_rect = m_united_xref_text_rect.united(mapped_xref_text_rect);
+				}
+
+					//if mouse hover the xref text, draw it in blue to advise user the xref is clickable.
+				if (!m_mouse_hover_pos.isNull() && mapped_xref_text_rect.contains(m_mouse_hover_pos)) {
+					painter->setPen(Qt::blue);
+					m_hovered_xref.physical = physical_index;
+					m_hovered_xref.real = i;
+				}
+
 				painter->drawText(xref_rect, xref_string, xref_text_option);
 
 				if (m_preview_draw)
@@ -234,6 +261,7 @@ void TerminalStripDrawer::paint(QPainter *painter)
                 painter->translate(terminal_rect.width(),0);
                 x_offset += terminal_rect.width();
             }
+			physical_index++;
         }
         painter->restore();
 
@@ -269,6 +297,41 @@ void TerminalStripDrawer::setPreviewDraw(bool draw) {
     m_preview_draw = draw;
 }
 
+void TerminalStripDrawer::setMouseHoverPos(const QPointF &pos)
+{
+	m_last_mouse_pos_in_xrefs_rect = m_united_xref_text_rect.contains(m_mouse_hover_pos);
+	m_mouse_hover_pos = pos;
+}
+
+/**
+ * @brief TerminalStripDrawer::mouseHoverXref
+ * @return True if the mouse position (given through the function setMouseHoverPos)
+ * hover the rect of a xref.
+ */
+bool TerminalStripDrawer::mouseHoverXref() const {
+	return m_united_xref_text_rect.contains(m_mouse_hover_pos);
+}
+
+bool TerminalStripDrawer::needUpdate()
+{
+	if (mouseHoverXref()) {
+		return true;
+	} else if (m_last_mouse_pos_in_xrefs_rect) {
+		return true;
+	}
+	return false;
+}
+
+/**
+ * @brief TerminalStripDrawer::hoveredXref
+ * @return the current terminal hovered by the mouse
+ * in the xref bounding rectangle
+ */
+hoverTerminal TerminalStripDrawer::hoveredXref() const
+{
+	return m_hovered_xref;
+}
+
 qreal TerminalStripDrawer::height() const
 {
     if (m_pattern)