class_docstr: Creates and controls a QFont value. Be careful when selecting options from the font dropdown. since not all
  fonts are available on all systems
class_docstr_tok: ["Creates","and","controls","a","QFont","value",".","Be","careful","when","selecting","options","from","the","font","dropdown",".","since","not","all","fonts","are","available","on","all","systems"]
code: def saveState(self, filter=None):
      state = super().saveState(filter)
      state["value"] = state["value"].toString()
      return state
  
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 FontParameter obj's underlying member method code with example usage: obj.saveState(filter) and returns: state