Qt.py 文件源码

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"

    _add(QtCompat, "__binding__", PyQt4.__name__)
    _add(QtCompat, "__binding_version__", PyQt4.QtCore.PYQT_VERSION_STR)
    _add(QtCompat, "__qt_version__", PyQt4.QtCore.QT_VERSION_STR)
    _add(QtCompat, "load_ui", lambda fname: uic.loadUi(fname))
    _add(QtCompat, "setSectionResizeMode", QtGui.QHeaderView.setResizeMode)

    # PySide2 differs from Qt4 in that Qt4 has one extra argument
    # which is always `None`. The lambda arguments represents the PySide2
    # interface, whereas the arguments passed to `.translate` represent
    # those expected of a Qt4 binding.
    _add(QtCompat, "translate",
         lambda context, sourceText, disambiguation, n:
         QtCore.QCoreApplication.translate(context,
                                           sourceText,
                                           disambiguation,
                                           QtCore.QCoreApplication.CodecForTr,
                                           n))

    _maintain_backwards_compatibility(PyQt4)

    return PyQt4