class_docstr: Provides dock-dropping methods
code: def dragEnterEvent(self, ev):
      src = ev.source()
      if hasattr(src, "implements") and src.implements("dock"):
          # print "drag enter accept"
          ev.accept()
      else:
          # print "drag enter ignore"
          ev.ignore()
  
file_path: pyqtgraph/pyqtgraph/dockarea/DockDrop.py
imports: from ..Qt import QtCore, QtGui, QtWidgets
label_desc: Use image node_id 6 for calling the DockDrop obj's underlying member method code with example usage: obj.dragEnterEvent(ev) without return types