class_docstr: Pyglet backend for Canvas abstract class.
class_docstr_tok: ["Pyglet","backend","for","Canvas","abstract","class","."]
code: def on_mouse_motion(self, x, y, dx, dy):
      if self._vispy_canvas is None:
          return
      self._vispy_mouse_move(
          pos=(x, self.get_size()[1] - y),
          modifiers=self._modifiers(),
      )
  
imports: from __future__ import division
  from packaging.version import Version
  from time import sleep
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 25 for calling the CanvasBackend obj's underlying member method code with example usage: obj.on_mouse_motion(x, y, dx, dy) without return types