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Qt.py
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Qt.py
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"""Map all bindings to PySide2
This module replaces itself with the most desirable binding.
Project goals:
Qt.py was born in the film and visual effects industry to address
the growing need for the development of software capable of running
with more than one flavour of the Qt bindings for Python - PySide,
PySide2, PyQt4 and PyQt5.
1. Build for one, run with all
2. Explicit is better than implicit
3. Support co-existence
Default resolution order:
- PySide2
- PyQt5
- PySide
- PyQt4
Usage:
>>> import sys
>>> from Qt import QtWidgets
>>> app = QtWidgets.QApplication(sys.argv)
>>> button = QtWidgets.QPushButton("Hello World")
>>> button.show()
>>> app.exec_()
"""
import os
import sys
__version__ = "0.4.0"
# All unique members of Qt.py
__added__ = list()
# Members copied from elsewhere, such as QtGui -> QtWidgets
__remapped__ = list()
# Existing members modified in some way
__modified__ = list()
def remap(object, name, value, safe=True):
"""Prevent accidental assignment of existing members
Arguments:
object (object): Parent of new attribute
name (str): Name of new attribute
value (object): Value of new attribute
safe (bool): Whether or not to guarantee that
the new attribute was not overwritten.
Can be set to False under condition that
it is superseded by extensive testing.
"""
if safe:
# Cannot alter original binding.
if hasattr(object, name):
raise AttributeError("Cannot override existing name: "
"%s.%s" % (object.__name__, name))
# Cannot alter classes of functions
if type(object).__name__ != "module":
raise AttributeError("%s != 'module': Cannot alter "
"anything but modules" % object)
__remapped__.append(name)
setattr(object, name, value)
def add(object, name, value):
"""Identical to :func:`remap` and provided for readability only"""
__added__.append(name)
remap(object, name, value)
def pyqt5():
import PyQt5.Qt
from PyQt5 import QtCore, uic
remap(QtCore, "Signal", QtCore.pyqtSignal)
remap(QtCore, "Slot", QtCore.pyqtSlot)
remap(QtCore, "Property", QtCore.pyqtProperty)
add(PyQt5, "__wrapper_version__", __version__)
add(PyQt5, "__binding__", "PyQt5")
add(PyQt5, "__binding_version__", QtCore.PYQT_VERSION_STR)
add(PyQt5, "__qt_version__", QtCore.QT_VERSION_STR)
add(PyQt5, "__added__", __added__)
add(PyQt5, "__remapped__", __remapped__)
add(PyQt5, "__modified__", __modified__)
add(PyQt5, "load_ui", lambda fname: uic.loadUi(fname))
return PyQt5
def pyqt4():
# Attempt to set sip API v2 (must be done prior to importing PyQt4)
import sip
try:
sip.setapi("QString", 2)
sip.setapi("QVariant", 2)
sip.setapi("QDate", 2)
sip.setapi("QDateTime", 2)
sip.setapi("QTextStream", 2)
sip.setapi("QTime", 2)
sip.setapi("QUrl", 2)
except AttributeError:
raise ImportError
# PyQt4 < v4.6
except ValueError:
# API version already set to v1
raise ImportError
import PyQt4.Qt
from PyQt4 import QtCore, QtGui, uic
remap(PyQt4, "QtWidgets", QtGui)
remap(QtCore, "Signal", QtCore.pyqtSignal)
remap(QtCore, "Slot", QtCore.pyqtSlot)
remap(QtCore, "Property", QtCore.pyqtProperty)
remap(QtCore, "QItemSelection", QtGui.QItemSelection)
remap(QtCore, "QStringListModel", QtGui.QStringListModel)
remap(QtCore, "QItemSelectionModel", QtGui.QItemSelectionModel)
remap(QtCore, "QSortFilterProxyModel", QtGui.QSortFilterProxyModel)
remap(QtCore, "QAbstractProxyModel", QtGui.QAbstractProxyModel)
try:
from PyQt4 import QtWebKit
remap(PyQt4, "QtWebKitWidgets", QtWebKit)
except ImportError:
# QtWebkit is optional in Qt , therefore might not be available
pass
add(PyQt4, "__wrapper_version__", __version__)
add(PyQt4, "__binding__", "PyQt4")
add(PyQt4, "__binding_version__", QtCore.PYQT_VERSION_STR)
add(PyQt4, "__qt_version__", QtCore.QT_VERSION_STR)
add(PyQt4, "__added__", __added__)
add(PyQt4, "__remapped__", __remapped__)
add(PyQt4, "__modified__", __modified__)
add(PyQt4, "load_ui", lambda fname: uic.loadUi(fname))
return PyQt4
def pyside2():
import PySide2
from PySide2 import QtGui, QtCore, QtUiTools
remap(QtCore, "QStringListModel", QtGui.QStringListModel)
add(PySide2, "__wrapper_version__", __version__)
add(PySide2, "__binding__", "PySide2")
add(PySide2, "__binding_version__", PySide2.__version__)
add(PySide2, "__qt_version__", PySide2.QtCore.qVersion())
add(PySide2, "__added__", __added__)
add(PySide2, "__remapped__", __remapped__)
add(PySide2, "__modified__", __modified__)
add(PySide2, "load_ui", lambda fname: QtUiTools.QUiLoader().load(fname))
return PySide2
def pyside():
import PySide
from PySide import QtGui, QtCore, QtUiTools
remap(PySide, "QtWidgets", QtGui)
remap(QtCore, "QSortFilterProxyModel", QtGui.QSortFilterProxyModel)
remap(QtCore, "QStringListModel", QtGui.QStringListModel)
remap(QtCore, "QItemSelection", QtGui.QItemSelection)
remap(QtCore, "QItemSelectionModel", QtGui.QItemSelectionModel)
remap(QtCore, "QAbstractProxyModel", QtGui.QAbstractProxyModel)
try:
from PySide import QtWebKit
remap(PySide, "QtWebKitWidgets", QtWebKit)
except ImportError:
# QtWebkit is optional in Qt , therefore might not be available
pass
add(PySide, "__wrapper_version__", __version__)
add(PySide, "__binding__", "PySide")
add(PySide, "__binding_version__", PySide.__version__)
add(PySide, "__qt_version__", PySide.QtCore.qVersion())
add(PySide, "__added__", __added__)
add(PySide, "__remapped__", __remapped__)
add(PySide, "__modified__", __modified__)
add(PySide, "load_ui", lambda fname: QtUiTools.QUiLoader().load(fname))
return PySide
def log(text, verbose):
if verbose:
sys.stdout.write(text)
def init():
"""Try loading each binding in turn
Please note: the entire Qt module is replaced with this code:
sys.modules["Qt"] = binding()
This means no functions or variables can be called after
this has executed.
"""
preferred = os.getenv("QT_PREFERRED_BINDING")
verbose = os.getenv("QT_VERBOSE") is not None
bindings = (pyside2, pyqt5, pyside, pyqt4)
if preferred:
# Internal flag (used in installer)
if preferred == "None":
sys.modules[__name__].__wrapper_version__ = __version__
return
preferred = preferred.split(os.pathsep)
available = {
"PySide2": pyside2,
"PyQt5": pyqt5,
"PySide": pyside,
"PyQt4": pyqt4
}
try:
bindings = [available[binding] for binding in preferred]
except KeyError:
raise ImportError(
"Available preferred Qt bindings: "
"\n".join(preferred)
)
for binding in bindings:
log("Trying %s" % binding.__name__[1:], verbose)
try:
sys.modules[__name__] = binding()
return
except ImportError as e:
log(" - ImportError(\"%s\")\n" % e, verbose)
continue
# If not binding were found, throw this error
raise ImportError("No Qt binding were found.")
init()