code: def updateDisplayLabel(self, value=None):
      if value is None:
          value = self.widget.currentText()
      super().updateDisplayLabel(value)
  
file_path: pyqtgraph/pyqtgraph/parametertree/parameterTypes/font.py
imports: from ...Qt import QtGui, QtWidgets
  from ..Parameter import Parameter
  from .basetypes import WidgetParameterItem
label_desc: Use image node_id 2 for calling the FontParameterItem obj's underlying member method code with example usage: obj.updateDisplayLabel(value) without return types