/usr/share/pyshared/matplotlib/backends/qt4_compat.py is in python-matplotlib 1.3.1-1ubuntu5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | """ A Qt API selector that can be used to switch between PyQt and PySide.
"""
import os
from matplotlib import rcParams, verbose
# Available APIs.
QT_API_PYQT = 'PyQt4' # API is not set here; Python 2.x default is V 1
QT_API_PYQTv2 = 'PyQt4v2' # forced to Version 2 API
QT_API_PYSIDE = 'PySide' # only supports Version 2 API
ETS = dict(pyqt=QT_API_PYQTv2, pyside=QT_API_PYSIDE)
# If the ETS QT_API environment variable is set, use it. Note that
# ETS requires the version 2 of PyQt4, which is not the platform
# default for Python 2.x.
QT_API_ENV = os.environ.get('QT_API')
if QT_API_ENV is not None:
try:
QT_API = ETS[QT_API_ENV]
except KeyError:
raise RuntimeError(
'Unrecognized environment variable %r, valid values are: %r or %r' %
(QT_API_ENV, 'pyqt', 'pyside'))
else:
# No ETS environment, so use rcParams.
QT_API = rcParams['backend.qt4']
# We will define an appropriate wrapper for the differing versions
# of file dialog.
_getSaveFileName = None
# Now perform the imports.
if QT_API in (QT_API_PYQT, QT_API_PYQTv2):
import sip
if QT_API == QT_API_PYQTv2:
if QT_API_ENV == 'pyqt':
cond = ("Found 'QT_API=pyqt' environment variable. "
"Setting PyQt4 API accordingly.\n")
else:
cond = "PyQt API v2 specified."
try:
sip.setapi('QString', 2)
except:
res = 'QString API v2 specification failed. Defaulting to v1.'
verbose.report(cond+res, 'helpful')
# condition has now been reported, no need to repeat it:
cond = ""
try:
sip.setapi('QVariant', 2)
except:
res = 'QVariant API v2 specification failed. Defaulting to v1.'
verbose.report(cond+res, 'helpful')
from PyQt4 import QtCore, QtGui
# Alias PyQt-specific functions for PySide compatibility.
QtCore.Signal = QtCore.pyqtSignal
try:
QtCore.Slot = QtCore.pyqtSlot
except AttributeError:
QtCore.Slot = pyqtSignature # Not a perfect match but
# works in simple cases
QtCore.Property = QtCore.pyqtProperty
__version__ = QtCore.PYQT_VERSION_STR
try :
if sip.getapi("QString") > 1 :
# Use new getSaveFileNameAndFilter()
_get_save = QtGui.QFileDialog.getSaveFileNameAndFilter
else :
# Use old getSaveFileName()
_getSaveFileName = QtGui.QFileDialog.getSaveFileName
except (AttributeError, KeyError) :
# call to getapi() can fail in older versions of sip
_getSaveFileName = QtGui.QFileDialog.getSaveFileName
else: # can only be pyside
from PySide import QtCore, QtGui, __version__, __version_info__
if __version_info__ < (1,0,3):
raise ImportError(
"Matplotlib backend_qt4 and backend_qt4agg require PySide >=1.0.3")
_get_save = QtGui.QFileDialog.getSaveFileName
if _getSaveFileName is None:
def _getSaveFileName(self, msg, start, filters, selectedFilter):
return _get_save(self, msg, start, filters, selectedFilter)[0]
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