code: def display(self):
          
          if self.data is None:
              return
  
          if self.scene is not None:
              self.y_scrollbar_value = self.verticalScrollBar().value()
              self.scene.clear()
  
          self.create_chan_labels()
          self.create_time_labels()
  
          window_start = self.parent.value('window_start')
          window_length = self.parent.value('window_length')
  
          time_height = max([x.boundingRect().height() for x in self.idx_time])
          label_width = window_length * self.parent.value('label_ratio')
          scene_height = (len(self.idx_label) * self.parent.value('y_distance') +
                          time_height)
  
          self.scene = QGraphicsScene(window_start - label_width,
                                      0,
                                      window_length + label_width,
                                      scene_height)
          self.setScene(self.scene)
  
          self.idx_markers = []
          self.idx_annot = []
          self.idx_annot_labels = []
  
          self.add_chan_labels()
          self.add_time_labels()
          self.add_traces()
          self.display_grid()
          self.display_markers()
          self.display_annotations()
  
          self.resizeEvent(None)
          self.verticalScrollBar().setValue(self.y_scrollbar_value)
          self.parent.info.display_view()
          self.parent.overview.display_current()
docs: Display the recordings.