code: def mouseClickEvent(self, ev):
      if ev.double():
          print("double click")
      else:
          print("click")
      ev.accept()
  
file_path: pyqtgraph/pyqtgraph/examples/GraphicsScene.py
imports: import pyqtgraph
  from pyqtgraph.Qt import QtCore, QtWidgets
label_desc: Use image node_id 4 for calling the Obj obj's underlying member method code with example usage: obj.mouseClickEvent(ev) without return types