Metaclass for automating uic operation when using the "Multiple Inheritance Approach" in Qt Widgets

windowmeta.py

from PyQt4 import uic
from PyQt4.QtCore import pyqtWrapperType

UI_DIR='path_to_ui_files'

class WindowMeta (pyqtWrapperType, type):
    """This is the metaclass of all Qt-Windows. It automatically
    sets the correct base classes, so they do not have to be set
    by the programmer.
    @attention: The class has to have the same name as the .ui-file.
    
    """
    def __new__ (cls, name, bases, dict):
        
        # parse UI
        new_bases = uic.loadUiType('%s/%s.ui' % (UI_DIR, name))
        
        # all the base classes - e.g. (UI_AQtWindow, PyQt4.QtGui.QDialog)
        dict.update(_bases = new_bases)
        
        # only the Qt-Baseclass (like QDialog or QMainWindow)
        # the class has to later to a self._qt_base.__init__(...)
        dict.update(_qt_base = new_bases[1])
        
        # create class
        return super(WindowMeta, cls).__new__(cls, name, new_bases+bases, dict)

    def __init__ (cls, name, bases, dict):
        b = dict["_bases"]
        del dict["_bases"]
        
        # init class
        super(WindowMeta, cls).__init__(name, b+bases, dict)