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A note that Qt4 is effectively disabled
A note that Qt4 is effectively disabled

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__init__.py
144 lines | 4.0 KiB | text/x-python | PythonLexer
import importlib
import os
aliases = {
'qt4': 'qt',
'gtk2': 'gtk',
}
backends = [
"qt",
"qt4",
"qt5",
"qt6",
"gtk",
"gtk2",
"gtk3",
"gtk4",
"tk",
"wx",
"pyglet",
"glut",
"osx",
"asyncio",
]
registered = {}
def register(name, inputhook):
"""Register the function *inputhook* as an event loop integration."""
registered[name] = inputhook
class UnknownBackend(KeyError):
def __init__(self, name):
self.name = name
def __str__(self):
return ("No event loop integration for {!r}. "
"Supported event loops are: {}").format(self.name,
', '.join(backends + sorted(registered)))
last_qt_version = None
"""Stores which version (i.e. `gui`) was requested the first time."""
def set_qt_api(gui):
"""Sets the `QT_API` environment variable if it isn't already set."""
global last_qt_version
if gui != "qt" and last_qt_version is not None:
if last_qt_version != gui:
raise ValueError(
"Cannot switch Qt versions for this session; "
f"must use {last_qt_version}."
)
qt_api = os.environ.get("QT_API", None)
if qt_api is not None and gui != "qt":
env2gui = {
"pyside": "qt4",
"pyqt": "qt4",
"pyside2": "qt5",
"pyqt5": "qt5",
"pyside6": "qt6",
"pyqt6": "qt6",
}
if env2gui[qt_api] != gui:
print(
f'Request for "{gui}" will be ignored because `QT_API` '
f'environment variable is set to "{qt_api}"'
)
else:
# NOTE: 'qt4' is not selectable because it's set as an alias for 'qt'; see `aliases` above.
if gui == "qt4":
try:
import PyQt # noqa
os.environ["QT_API"] = "pyqt"
except ImportError:
try:
import PySide # noqa
os.environ["QT_API"] = "pyside"
except ImportError:
# Neither implementation installed; set it to something so IPython gives an error
os.environ["QT_API"] = "pyqt"
elif gui == "qt5":
try:
import PyQt5 # noqa
os.environ["QT_API"] = "pyqt5"
except ImportError:
try:
import PySide2 # noqa
os.environ["QT_API"] = "pyside2"
except ImportError:
os.environ["QT_API"] = "pyqt5"
elif gui == "qt6":
try:
import PyQt6 # noqa
os.environ["QT_API"] = "pyqt6"
except ImportError:
try:
import PySide6 # noqa
os.environ["QT_API"] = "pyside6"
except ImportError:
os.environ["QT_API"] = "pyqt6"
elif gui == "qt":
# Don't set QT_API; let IPython logic choose the version.
if "QT_API" in os.environ.keys():
del os.environ["QT_API"]
else:
raise ValueError(
f'Unrecognized Qt version: {gui}. Should be "qt4", "qt5", "qt6", or "qt".'
)
# Due to the import mechanism, we can't change Qt versions once we've chosen one. So we tag the
# version so we can check for this and give an error.
last_qt_version = gui
def get_inputhook_name_and_func(gui):
print(f"`get_inputhook_name_and_func` called with {gui=}")
if gui in registered:
return gui, registered[gui]
if gui not in backends:
raise UnknownBackend(gui)
if gui in aliases:
print("gui has an alias")
return get_inputhook_name_and_func(aliases[gui])
gui_mod = gui
if gui.startswith("qt"):
set_qt_api(gui)
gui_mod = "qt"
mod = importlib.import_module("IPython.terminal.pt_inputhooks." + gui_mod)
return gui, mod.inputhook