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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import importlib
import os
import sys
QtAPIs = [
("pyside2", "PySide2"),
("pyside6", "PySide6"),
("pyqt5", "PyQt5"),
("pyqt6", "PyQt6"),
]
api_names, modules = zip(*QtAPIs)
qt_api = None
# have we already imported a Qt API?
for api_name, module in QtAPIs:
if module in sys.modules:
qt_api = api_name
break
else:
# does our environment give us a preferred API?
qt_api = os.environ.get("QT_API")
# if we have no preference, is a Qt API available? Or fail with ImportError.
if qt_api is None:
for api_name, module in QtAPIs:
try:
importlib.import_module(module)
importlib.import_module(".QtCore", module)
qt_api = api_name
break
except ImportError:
continue
else:
raise ImportError("Cannot import any of " + ", ".join(modules))
# otherwise check QT_API value is valid
elif qt_api not in api_names:
msg = (
"Invalid Qt API %r, valid values are: "
+ ', '.join(api_names)
) % qt_api
raise RuntimeError(msg)
# useful constants
is_qt4 = False
is_qt5 = qt_api in {"pyqt5", "pyside2"}
is_qt6 = qt_api in {"pyqt6", "pyside6"}
is_pyqt = qt_api in {"pyqt", "pyqt5", "pyqt6"}
is_pyside = qt_api in {"pyside", "pyside2", "pyside6"}
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