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""" A Qt API selector that can be used to switch between PyQt and PySide.
This uses the ETS 4.0 selection pattern of:
PySide first, PyQt with API v2. second.
Do not use this if you need PyQt with the old QString/QVariant API.
"""
import os
# Available APIs.
QT_API_PYQT = 'pyqt'
QT_API_PYSIDE = 'pyside'
def prepare_pyqt4():
# For PySide compatibility, use the new-style string API that automatically
# converts QStrings to Unicode Python strings. Also, automatically unpack
# QVariants to their underlying objects.
import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)
# Select Qt binding, using the QT_API environment variable if available.
QT_API = os.environ.get('QT_API')
if QT_API is None:
try:
import PySide
if PySide.__version__ < '1.0.3':
# old PySide, fallback on PyQt
raise ImportError
QT_API = QT_API_PYSIDE
except ImportError:
try:
prepare_pyqt4()
import PyQt4
from PyQt4 import QtCore
if QtCore.PYQT_VERSION_STR < '4.7':
# PyQt 4.6 has issues with null strings returning as None
raise ImportError
QT_API = QT_API_PYQT
except ImportError:
raise ImportError('Cannot import PySide >= 1.0.3 or PyQt4 >= 4.7')
elif QT_API == QT_API_PYQT:
# Note: This must be called *before* PyQt4 is imported.
prepare_pyqt4()
# Now peform the imports.
if QT_API == QT_API_PYQT:
from PyQt4 import QtCore, QtGui, QtSvg
if QtCore.PYQT_VERSION_STR < '4.7':
raise ImportError("IPython requires PyQt4 >= 4.7, found %s"%QtCore.PYQT_VERSION_STR)
# Alias PyQt-specific functions for PySide compatibility.
QtCore.Signal = QtCore.pyqtSignal
QtCore.Slot = QtCore.pyqtSlot
elif QT_API == QT_API_PYSIDE:
import PySide
if PySide.__version__ < '1.0.3':
raise ImportError("IPython requires PySide >= 1.0.3, found %s"%PySide.__version__)
from PySide import QtCore, QtGui, QtSvg
else:
raise RuntimeError('Invalid Qt API %r, valid values are: %r or %r' %
(QT_API, QT_API_PYQT, QT_API_PYSIDE))
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