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"""
NOTE: Importing this module will select and commit to a Qt API.
"""
import os
import sys
import warnings
import AnyQt
if sys.version_info < (3,):
_intern = intern
else:
_intern = sys.intern
USED_API = None
QT_API_PYQT6 = "pyqt6"
QT_API_PYQT5 = "pyqt5"
QT_API_PYQT4 = "pyqt4"
QT_API_PYSIDE6 = "pyside6"
QT_API_PYSIDE2 = "pyside2"
QT_API_PYSIDE = "pyside"
ALL_APIS = [
QT_API_PYQT6, QT_API_PYQT5, QT_API_PYQT4,
QT_API_PYSIDE6, QT_API_PYSIDE2, QT_API_PYSIDE
]
def comittoapi(api):
"""
Commit to the use of specified Qt api.
Raise an error if another Qt api is already loaded in sys.modules
"""
global USED_API
assert USED_API is None, "committoapi called again!"
check = ["PyQt4", "PyQt5", "PyQt6", "PySide", "PySide2", "PySide6"]
assert api in ALL_APIS
for name in check:
if name.lower() != api and name in sys.modules:
raise RuntimeError(
"{} was already imported. Cannot commit to {}!"
.format(name, api)
)
else:
api = _intern(api)
USED_API = api
AnyQt.__SELECTED_API = api
AnyQt.USED_API = api
if AnyQt.__SELECTED_API is not None:
comittoapi(AnyQt.__SELECTED_API)
elif "QT_API" in os.environ:
api = os.environ["QT_API"].lower()
if api == "pyqt":
# Qt.py allows both pyqt4 and pyqt to specify PyQt4.
# When run from anaconda-navigator, pyqt is used.
api = "pyqt4"
if api in ALL_APIS:
comittoapi(api)
else:
warnings.warn(
"'QT_API' environment variable names an unknown Qt API ('{}')."
.format(os.environ["QT_API"]),
RuntimeWarning, stacklevel=3)
# pass through
if USED_API is None:
# Check sys.modules for existing imports
__existing = None
if "PyQt6" in sys.modules:
__existing = QT_API_PYQT6
elif "PyQt5" in sys.modules:
__existing = QT_API_PYQT5
elif "PyQt4" in sys.modules:
__existing = QT_API_PYQT4
elif "PySide6" in sys.modules:
__existing = QT_API_PYSIDE6
elif "PySide2" in sys.modules:
__existing = QT_API_PYSIDE2
elif "PySide" in sys.modules:
__existing = QT_API_PYSIDE
if __existing is not None:
comittoapi(__existing)
else:
available = AnyQt.availableapi()
__available = None
if AnyQt.__PREFERRED_API is not None and \
AnyQt.__PREFERRED_API.lower() in [name.lower() for name in available]:
__available = AnyQt.__PREFERRED_API.lower()
elif "PyQt5" in available:
__available = QT_API_PYQT5
elif "PyQt4" in available:
__available = QT_API_PYQT4
elif "PySide" in available:
__available = QT_API_PYSIDE
elif "PySide2" in available:
__available = QT_API_PYSIDE2
elif "PyQt6" in available:
__available = QT_API_PYQT6
if __available is not None:
comittoapi(__available)
del __available
del __existing
if USED_API is None:
raise ImportError("PyQt4, PyQt5, PySide or PySide2 are not available for import")
if "ANYQT_HOOK_DENY" in os.environ:
from AnyQt.importhooks import install_deny_hook
for __denyapi in os.environ["ANYQT_HOOK_DENY"].split(","):
if __denyapi.lower() != USED_API:
install_deny_hook(__denyapi.lower())
del install_deny_hook
if "ANYQT_HOOK_BACKPORT" in os.environ:
from AnyQt.importhooks import install_backport_hook
for __backportapi in os.environ["ANYQT_HOOK_BACKPORT"].split(","):
if __backportapi.lower() != USED_API:
install_backport_hook(__backportapi.lower())
del install_backport_hook
from ._fixes import global_fixes as apply_global_fixes
|
