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"""Deal with pyface backend issues."""
# Author: Christian Brodbeck <christianbrodbeck@nyu.edu>
#
# License: BSD (3-clause)
import os
from ..utils import warn
def _check_pyface_backend():
"""Check the currently selected Pyface backend.
Returns
-------
backend : str
Name of the backend.
result : 0 | 1 | 2
0: the backend has been tested and works.
1: the backend has not been tested.
2: the backend not been tested.
Notes
-----
See also http://docs.enthought.com/pyface/.
"""
try:
from traitsui.toolkit import toolkit
from traits.etsconfig.api import ETSConfig
except ImportError:
return None, 2
toolkit()
backend = ETSConfig.toolkit
if backend == 'qt4':
status = 0
else:
status = 1
return backend, status
def _check_backend():
try:
from pyface.api import warning
except ImportError:
def warning(a, msg, title):
warn(msg)
backend, status = _check_pyface_backend()
if status == 0:
return
elif status == 1:
msg = ("The currently selected Pyface backend %s has not been "
"extensively tested. We recommend using qt4 which can be "
"enabled by installing the pyside package. If you proceed with "
"the current backend pease let the developers know your "
"experience." % backend)
elif status == 2:
msg = ("The currently selected Pyface backend %s has known issues. We "
"recommend using qt4 which can be enabled by installing the "
"pyside package." % backend)
warning(None, msg, "Pyface Backend Warning")
def _testing_mode():
"""Determine if we're running tests."""
return os.getenv('_MNE_GUI_TESTING_MODE', '') == 'true'
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