code: def mouseReleaseEvent(self, ev):
      if ev.button() == Qt.MiddleButton:
          self.middle_click = False
      super(AnnotationView, self).mouseReleaseEvent(ev)
  
file_path: PaddleSeg/EISeg/eiseg/widget/view.py
imports: from qtpy import QtWidgets, QtCore, QtGui
  from qtpy.QtCore import Qt, QPointF
label_desc: Use image node_id 6 for calling the AnnotationView obj's underlying member method code with example usage: obj.mouseReleaseEvent(ev) without return types