+ virtual QRectF label_rect(const QRectF &rect) const;
+
+ /**
+ * Computes the outline rectangle of the viewport hit-box.
+ * @param rect the rectangle of the viewport area.
+ * @return Returns the rectangle of the hit-box.
+ * @remarks The default implementation returns an empty hit-box.
+ */
+ virtual QRectF hit_box_rect(const ViewItemPaintParams &pp) const;
+
+ /**
+ * Paints the signal label.
+ * @param p the QPainter to paint into.
+ * @param rect the rectangle of the header area.
+ * @param hover true if the label is being hovered over by the mouse.
+ */
+ virtual void paint_label(QPainter &p, const QRect &rect, bool hover);
+
+ /**
+ * Paints the background layer of the item with a QPainter
+ * @param p the QPainter to paint into.
+ * @param pp the painting parameters object to paint with.
+ */
+ virtual void paint_back(QPainter &p, ViewItemPaintParams &pp);
+
+ /**
+ * Paints the mid-layer of the item with a QPainter
+ * @param p the QPainter to paint into.
+ * @param pp the painting parameters object to paint with.
+ */
+ virtual void paint_mid(QPainter &p, ViewItemPaintParams &pp);
+
+ /**
+ * Paints the foreground layer of the item with a QPainter
+ * @param p the QPainter to paint into.
+ * @param pp the painting parameters object to paint with.
+ */
+ virtual void paint_fore(QPainter &p, ViewItemPaintParams &pp);