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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
""" PySide2 proxy backend for the qt backend.
"""
import sys
from .. import backends
from ...util import logger
from ... import config
USE_EGL = config['gl_backend'].lower().startswith('es')
try:
# Make sure no conflicting libraries have been imported.
for lib in ['PySide', 'PyQt4', 'PyQt5']:
lib += '.QtCore'
if lib in sys.modules:
raise RuntimeError("Refusing to import PySide2 because %s is "
"already imported." % lib)
# Try importing (QtOpenGL first to fail without import QtCore)
if not USE_EGL:
from PySide2 import QtOpenGL # noqa
from PySide2 import QtGui, QtCore # noqa
except Exception as exp:
# Fail: this backend cannot be used
available, testable, why_not, which = False, False, str(exp), None
else:
# Success
available, testable, why_not = True, True, None
# What is this for? PyQt5 sets this to true, PySide sets this to false
has_uic = False
import PySide2
# PySide2 doesn't have qWait for some reason see:
# https://github.com/pyqtgraph/pyqtgraph/pull/376/commits/8bdc19be75a7552cc0043bf8b5f5e0ee796edda0
from PySide2 import QtTest
if not hasattr(QtTest.QTest, 'qWait'):
@staticmethod
def qWait(msec):
import time
start = time.time()
PySide2.QtWidgets.QApplication.processEvents()
while time.time() < start + msec * 0.001:
PySide2.QtWidgets.QApplication.processEvents()
QtTest.QTest.qWait = qWait
which = ('PySide2', PySide2.__version__, QtCore.__version__)
# Remove _qt module to force an import even if it was already imported
sys.modules.pop(__name__.replace('_pyside2', '_qt'), None)
# Import _qt. Keep a ref to the module object!
if backends.qt_lib is None:
backends.qt_lib = 'pyside2' # Signal to _qt what it should import
from . import _qt # noqa
from ._qt import * # noqa
else:
logger.info('%s already imported, cannot switch to %s'
% (backends.qt_lib, 'pyside2'))
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