code: def makeWidget(self):
      self.asSubItem = True
      w = QtWidgets.QCalendarWidget()
      w.setMaximumHeight(200)
      w.sigChanged = w.selectionChanged
      w.value = w.selectedDate
      w.setValue = w.setSelectedDate
      self.hideWidget = False
      self.param.opts.setdefault("default", QtCore.QDate.currentDate())
      return w
  
file_path: pyqtgraph/pyqtgraph/parametertree/parameterTypes/calendar.py
imports: from ...Qt import QtCore, QtWidgets
  from ..Parameter import Parameter
  from .basetypes import WidgetParameterItem
label_desc: Use image node_id 1 for calling the CalendarParameterItem obj's underlying member method code with example usage: obj.makeWidget() and returns: w