#############################################################################
##
## Copyright (C) 2011 Riverbank Computing Limited.
## Copyright (C) 2006 Thorsten Marek.
## All right reserved.
##
## This file is part of PyQt.
##
## You may use this file under the terms of the GPL v2 or the revised BSD
## license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of the Riverbank Computing Limited nor the names
##     of its contributors may be used to endorse or promote products
##     derived from this software without specific prior written
##     permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
#############################################################################


import os.path

from PyQt4 import QtGui, QtCore
from PyQt4.uic.uiparser import UIParser
from PyQt4.uic.Loader.qobjectcreator import LoaderCreatorPolicy


class DynamicUILoader(UIParser):
    def __init__(self):
        UIParser.__init__(self, QtCore, QtGui, LoaderCreatorPolicy())

    def createToplevelWidget(self, classname, widgetname):
        if self.toplevelInst is not None:
            if not isinstance(self.toplevelInst, self.factory.findQObjectType(classname)):
                raise TypeError(("Wrong base class of toplevel widget",
                                  (type(self.toplevelInst), classname)))
            return self.toplevelInst
        else:
            return self.factory.createQObject(classname, widgetname, ())

    def loadUi(self, filename, toplevelInst=None):
        self.toplevelInst = toplevelInst

        if hasattr(filename, 'read'):
            basedir = ''
        else:
            # Allow the filename to be a QString.
            filename = str(filename)
            basedir = os.path.dirname(filename)

        return self.parse(filename, basedir)
