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""" Import Qt in a manner suitable for an IPython kernel.
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This is the import used for the `gui=qt` or `matplotlib=qt` initialization.
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Import Priority:
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if Qt4 has been imported anywhere else:
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use that
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if matplotlib has been imported and doesn't support v2 (<= 1.0.1):
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use PyQt4 @v1
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Next, ask ETS' QT_API env variable
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if QT_API not set:
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ask matplotlib via rcParams['backend.qt4']
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if it said PyQt:
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use PyQt4 @v1
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elif it said PySide:
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use PySide
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else: (matplotlib said nothing)
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# this is the default path - nobody told us anything
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try:
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PyQt @v1
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except:
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fallback on PySide
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else:
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use PyQt @v2 or PySide, depending on QT_API
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because ETS doesn't work with PyQt @v1.
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"""
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import os
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import sys
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from IPython.utils.version import check_version
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from IPython.external.qt_loaders import (load_qt, QT_API_PYSIDE,
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QT_API_PYQT, QT_API_PYQT_DEFAULT,
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loaded_api)
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#Constraints placed on an imported matplotlib
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def matplotlib_options(mpl):
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if mpl is None:
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return
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mpqt = mpl.rcParams.get('backend.qt4', None)
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if mpqt is None:
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return None
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if mpqt.lower() == 'pyside':
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return [QT_API_PYSIDE]
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elif mpqt.lower() == 'pyqt4':
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return [QT_API_PYQT_DEFAULT]
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raise ImportError("unhandled value for backend.qt4 from matplotlib: %r" %
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mpqt)
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def get_options():
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"""Return a list of acceptable QT APIs, in decreasing order of
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preference
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"""
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#already imported Qt somewhere. Use that
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loaded = loaded_api()
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if loaded is not None:
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return [loaded]
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mpl = sys.modules.get('matplotlib', None)
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if mpl is not None and not check_version(mpl.__version__, '1.0.2'):
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#1.0.1 only supports PyQt4 v1
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return [QT_API_PYQT_DEFAULT]
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if os.environ.get('QT_API', None) is None:
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#no ETS variable. Ask mpl, then use either
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return matplotlib_options(mpl) or [QT_API_PYQT_DEFAULT, QT_API_PYSIDE]
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#ETS variable present. Will fallback to external.qt
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return None
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api_opts = get_options()
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if api_opts is not None:
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QtCore, QtGui, QtSvg, QT_API = load_qt(api_opts)
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else: # use ETS variable
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from IPython.external.qt import QtCore, QtGui, QtSvg, QT_API
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