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import sys
__PREFERRED_API = None
__SELECTED_API = None
#: A string indicating which Qt api is used (will be `None` *until* a api is
#: selected and commited to.
USED_API = None
def setpreferredapi(api):
"""
Set the preferred Qt API.
Will raise a RuntimeError if a Qt API was already selected.
Note that QT_API environment variable (if set) will take precedence.
"""
global __PREFERRED_API
if __SELECTED_API is not None:
raise RuntimeError("A Qt api {} was already selected"
.format(__SELECTED_API))
if api.lower() not in {"pyqt4", "pyqt5", "pyside", "pyside2"}:
raise ValueError(api)
__PREFERRED_API = api.lower()
def selectapi(api):
"""
Select an Qt API to use.
This can only be set once and before any of the Qt modules are explicitly
imported.
"""
global __SELECTED_API, USED_API
if api.lower() not in {"pyqt4", "pyqt5", "pyside", "pyside2"}:
raise ValueError(api)
if __SELECTED_API is not None and __SELECTED_API.lower() != api.lower():
raise RuntimeError("A Qt API {} was already selected"
.format(__SELECTED_API))
elif __SELECTED_API is None:
__SELECTED_API = api.lower()
from . import _api
USED_API = _api.USED_API
if sys.version_info < (3, 4):
import imp as _imp
def __islocatable(name):
try:
_imp.find_module(name)
except ImportError:
return False
else:
return True
else:
import importlib.util as _importlibutil
def __islocatable(name):
try:
return _importlibutil.find_spec(name) is not None
except (ValueError, ImportError):
return False
def availableapi():
"""
Return a list of available Qt interfaces.
"""
search = ["PyQt5", "PyQt6", "PyQt4", "PySide2", "PySide6", "PySide"]
return [name for name in search if __islocatable(name)]
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