docs: def mousePressEvent(self, event):
          """
          Creates the drag event for this item.
          
          :param      event | <QMousePressEvent>
          """
          near_x, near_y = self.nearestPoint(event.pos())
          
          data = self.dragData(x=near_x, y=near_y)
          self.startDrag(data)
          
          super(XChartWidgetItem, self).mousePressEvent(event)