Mercurial Repositories > eric / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eric6/Toolbox/PyQt4ImportHook.py	Sun Apr 14 15:09:21 2019 +0200
@@ -0,0 +1,105 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2014 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing an import hook converting PyQt5 imports to PyQt4 imports.
+"""
+
+from __future__ import unicode_literals
+
+import sys
+import importlib
+
+
+class PyQt4Importer(object):
+    """
+    Class implementing an importer converting PyQt5 imports to PyQt4
+    imports.
+    """
+    def __init__(self):
+        """
+        Constructor
+        """
+        self.__path = None
+    
+    def find_module(self, fullname, path=None):
+        """
+        Public method returning the module loader.
+        
+        @param fullname name of the module to be loaded (string)
+        @param path path to resolve the module name (string)
+        @return module loader object
+        """
+        if fullname.startswith("PyQt5"):
+            self.__path = path
+            return self
+        
+        return None
+    
+    @staticmethod
+    def QComboBox_currentData(other, role=None):
+        """
+        Static method to emulate the currentData method of Qt5.
+        
+        @param other reference to the combo box to get the user data of
+        @type QComboBox
+        @param role role of which data should be retrieved
+        @type int
+        @return stored data at current selection
+        @rtype any
+        """
+        import PyQt4.Qt
+        if role is None:
+            role = PyQt4.Qt.Qt.UserRole
+        
+        idx = other.currentIndex()
+        return other.itemData(idx, role)
+    
+    def load_module(self, fullname):
+        """
+        Public method to load a module.
+        
+        @param fullname name of the module to be loaded (string)
+        @return reference to the loaded module (module)
+        """
+        if fullname in ["PyQt5.QtWidgets", "PyQt5.QtPrintSupport"]:
+            newname = "PyQt4.QtGui"
+        elif fullname in ["PyQt5.QtWebKitWidgets"]:
+            newname = "PyQt4.QtWebKit"
+        else:
+            newname = fullname.replace("PyQt5", "PyQt4")
+        
+        module = importlib.import_module(newname)
+        sys.modules[fullname] = module
+        if fullname == "PyQt5.QtCore":
+            import PyQt4.QtGui
+            module.qInstallMessageHandler = module.qInstallMsgHandler
+            module.QItemSelectionModel = PyQt4.QtGui.QItemSelectionModel
+            module.QItemSelection = PyQt4.QtGui.QItemSelection
+            module.QSortFilterProxyModel = \
+                PyQt4.QtGui.QSortFilterProxyModel
+            module.QAbstractProxyModel = PyQt4.QtGui.QAbstractProxyModel
+            module.QStringListModel = PyQt4.QtGui.QStringListModel
+            
+            PyQt4.QtGui.QComboBox.currentData = self.QComboBox_currentData
+        return module
+
+try:
+    if "--pyqt4" in sys.argv:
+        sys.argv.remove("--pyqt4")
+        # fake a failed PyQt5 import
+        raise ImportError
+    import PyQt5    # __IGNORE_WARNING__
+except ImportError:
+    sys.meta_path.insert(0, PyQt4Importer())
+    
+    if sys.version_info[0] == 2:
+        try:
+            from PyQt5 import sip
+        except ImportError:
+            import sip
+        sip.setapi('QString', 2)
+        sip.setapi('QVariant', 2)
+        sip.setapi('QTextStream', 2)