class_docstr: SDL2 backend for Canvas abstract class.
class_docstr_tok: ["SDL2","backend","for","Canvas","abstract","class","."]
code: def _vispy_set_current(self):
      if self._id is None:
          return
      # Make this the current context
      sdl2.SDL_GL_MakeCurrent(self._id.window, self._native_context)
  
imports: from __future__ import division
  import atexit
  import ctypes
  from time import sleep
  import warnings
  import gc
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys, logger
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 3 for calling the CanvasBackend obj's underlying member method code with example usage: obj._vispy_set_current() without return types