Sets the `QT_API` environment variable if it isn't already set.
(gui)
| 42 | |
| 43 | |
| 44 | def set_qt_api(gui): |
| 45 | """Sets the `QT_API` environment variable if it isn't already set.""" |
| 46 | |
| 47 | qt_api = os.environ.get("QT_API", None) |
| 48 | |
| 49 | from IPython.external.qt_loaders import ( |
| 50 | QT_API_PYQT, |
| 51 | QT_API_PYQT5, |
| 52 | QT_API_PYQT6, |
| 53 | QT_API_PYSIDE, |
| 54 | QT_API_PYSIDE2, |
| 55 | QT_API_PYSIDE6, |
| 56 | QT_API_PYQTv1, |
| 57 | loaded_api, |
| 58 | ) |
| 59 | |
| 60 | loaded = loaded_api() |
| 61 | |
| 62 | qt_env2gui = { |
| 63 | QT_API_PYSIDE: "qt4", |
| 64 | QT_API_PYQTv1: "qt4", |
| 65 | QT_API_PYQT: "qt4", |
| 66 | QT_API_PYSIDE2: "qt5", |
| 67 | QT_API_PYQT5: "qt5", |
| 68 | QT_API_PYSIDE6: "qt6", |
| 69 | QT_API_PYQT6: "qt6", |
| 70 | } |
| 71 | if loaded is not None and gui != "qt": |
| 72 | if qt_env2gui[loaded] != gui: |
| 73 | print( |
| 74 | f"Cannot switch Qt versions for this session; will use {qt_env2gui[loaded]}." |
| 75 | ) |
| 76 | return qt_env2gui[loaded] |
| 77 | |
| 78 | if qt_api is not None and gui != "qt": |
| 79 | if qt_env2gui[qt_api] != gui: |
| 80 | print( |
| 81 | f'Request for "{gui}" will be ignored because `QT_API` ' |
| 82 | f'environment variable is set to "{qt_api}"' |
| 83 | ) |
| 84 | return qt_env2gui[qt_api] |
| 85 | else: |
| 86 | if gui == "qt5": |
| 87 | try: |
| 88 | import PyQt5 # noqa |
| 89 | |
| 90 | os.environ["QT_API"] = "pyqt5" |
| 91 | except ImportError: |
| 92 | try: |
| 93 | import PySide2 # noqa |
| 94 | |
| 95 | os.environ["QT_API"] = "pyside2" |
| 96 | except ImportError: |
| 97 | os.environ["QT_API"] = "pyqt5" |
| 98 | elif gui == "qt6": |
| 99 | try: |
| 100 | import PyQt6 # noqa |
| 101 |
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