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