class_docstr: Represents a mouse event that occurred on a SceneCanvas. This event is
  delivered to all entities whose mouse interaction area is under the event.
docstr: The mouse event immediately prior to this one. This
  property is None when no mouse buttons are pressed.
docstr_tok: ["The","mouse","event","immediately","prior","to","this","one",".","This","property","is","None","when","no","mouse","buttons","are","pressed","."]
code: def last_event(self):
      """The mouse event immediately prior to this one. This
      property is None when no mouse buttons are pressed.
      """
      if self.mouse_event.last_event is None:
          return None
      ev = self.copy()
      ev.mouse_event = self.mouse_event.last_event
      return ev
  
file_path: vispy/vispy/scene/events.py
imports: from __future__ import division
  from ..util.event import Event
label_desc: Use image node_id 5 for calling the SceneMouseEvent obj's underlying member method code with example usage: obj.last_event() and returns: ev, None