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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
QT_API = QT_API_PYSIDE
except ImportError:
try:
prepare_pyqt4()
import PyQt4
QT_API = QT_API_PYQT
except ImportError:
raise ImportError('Cannot import PySide or PyQt4')
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
# Alias PyQt-specific functions for PySide compatibility.
QtCore.Signal = QtCore.pyqtSignal
QtCore.Slot = QtCore.pyqtSlot
elif QT_API == QT_API_PYSIDE:
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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