+ /**
+ * Satisifies RowItem functionality.
+ * @param p the QPainter to paint into.
+ * @param right the x-coordinate of the right edge of the header
+ * area.
+ * @param hover true if the label is being hovered over by the mouse.
+ */
+ void paint_label(QPainter &p, int right, bool hover);
+
+ /**
+ * Computes the outline rectangle of a label.
+ * @param right the x-coordinate of the right edge of the header
+ * area.
+ * @return Returns the rectangle of the signal label.
+ */
+ QRectF label_rect(int right);
+