pyqtgraph/Qt.py

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"""
This module exists to smooth out some of the differences between PySide and PyQt4:
* Automatically import either PyQt4 or PySide depending on availability
* Allow to import QtCore/QtGui pyqtgraph.Qt without specifying which Qt wrapper
you want to use.
* Declare QtCore.Signal, .Slot in PyQt4
* Declare loadUiType function for Pyside
"""
import sys, re
from .python2_3 import asUnicode
## Automatically determine whether to use PyQt or PySide.
## This is done by first checking to see whether one of the libraries
## is already imported. If not, then attempt to import PyQt4, then PySide.
if 'PyQt4' in sys.modules:
USE_PYSIDE = False
elif 'PySide' in sys.modules:
USE_PYSIDE = True
else:
try:
import PyQt4
USE_PYSIDE = False
except ImportError:
try:
import PySide
USE_PYSIDE = True
except ImportError:
raise Exception("PyQtGraph requires either PyQt4 or PySide; neither package could be imported.")
if USE_PYSIDE:
from PySide import QtGui, QtCore, QtOpenGL, QtSvg
try:
from PySide import QtTest
except ImportError:
pass
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import PySide
try:
from PySide import shiboken
isQObjectAlive = shiboken.isValid
except ImportError:
def isQObjectAlive(obj):
try:
if hasattr(obj, 'parent'):
obj.parent()
elif hasattr(obj, 'parentItem'):
obj.parentItem()
else:
raise Exception("Cannot determine whether Qt object %s is still alive." % obj)
except RuntimeError:
return False
else:
return True
VERSION_INFO = 'PySide ' + PySide.__version__
# Make a loadUiType function like PyQt has
# Credit:
# http://stackoverflow.com/questions/4442286/python-code-genration-with-pyside-uic/14195313#14195313
class StringIO(object):
"""Alternative to built-in StringIO needed to circumvent unicode/ascii issues"""
def __init__(self):
self.data = []
def write(self, data):
self.data.append(data)
def getvalue(self):
return ''.join(map(asUnicode, self.data)).encode('utf8')
def loadUiType(uiFile):
"""
Pyside "loadUiType" command like PyQt4 has one, so we have to convert the ui file to py code in-memory first and then execute it in a special frame to retrieve the form_class.
"""
import pysideuic
import xml.etree.ElementTree as xml
#from io import StringIO
parsed = xml.parse(uiFile)
widget_class = parsed.find('widget').get('class')
form_class = parsed.find('class').text
with open(uiFile, 'r') as f:
o = StringIO()
frame = {}
pysideuic.compileUi(f, o, indent=0)
pyc = compile(o.getvalue(), '<string>', 'exec')
exec(pyc, frame)
#Fetch the base_class and form class based on their type in the xml from designer
form_class = frame['Ui_%s'%form_class]
base_class = eval('QtGui.%s'%widget_class)
return form_class, base_class
else:
from PyQt4 import QtGui, QtCore, uic
try:
from PyQt4 import QtSvg
except ImportError:
pass
try:
from PyQt4 import QtOpenGL
except ImportError:
pass
try:
from PyQt4 import QtTest
except ImportError:
pass
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import sip
def isQObjectAlive(obj):
return not sip.isdeleted(obj)
loadUiType = uic.loadUiType
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QtCore.Signal = QtCore.pyqtSignal
VERSION_INFO = 'PyQt4 ' + QtCore.PYQT_VERSION_STR + ' Qt ' + QtCore.QT_VERSION_STR
## Make sure we have Qt >= 4.7
versionReq = [4, 7]
QtVersion = PySide.QtCore.__version__ if USE_PYSIDE else QtCore.QT_VERSION_STR
m = re.match(r'(\d+)\.(\d+).*', QtVersion)
if m is not None and list(map(int, m.groups())) < versionReq:
print(list(map(int, m.groups())))
raise Exception('pyqtgraph requires Qt version >= %d.%d (your version is %s)' % (versionReq[0], versionReq[1], QtVersion))