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# Source code for camelot.view.controls.editors.languageeditor

    #  ============================================================================
    #
    #  Copyright (C) 2007-2011 Conceptive Engineering bvba. All rights reserved.
    #  www.conceptive.be / project-camelot@conceptive.be
    #
    #  This file is part of the Camelot Library.
    #
    #  This file may be used under the terms of the GNU General Public
    #  License version 2.0 as published by the Free Software Foundation
    #  and appearing in the file license.txt included in the packaging of
    #  this file.  Please review this information to ensure GNU
    #  General Public Licensing requirements will be met.
    #
    #  If you are unsure which license is appropriate for your use, please
    #  visit www.python-camelot.com or contact project-camelot@conceptive.be
    #
    #  This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    #  WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    #
    #  For use of this library in commercial applications, please contact
    #  project-camelot@conceptive.be
    #
    #  ============================================================================
    from PyQt4 import QtGui
    from PyQt4 import QtCore

    from customeditor import AbstractCustomEditor

    class LanguageEditor(QtGui.QComboBox, AbstractCustomEditor):
        """A ComboBox that shows a list of languages, the editor takes
        as its value the ISO code of the language"""

        editingFinished = QtCore.pyqtSignal()
        language_choices = []

        def __init__(self, parent=None, languages=[], field_name='language', **kwargs):
            """
            :param languages: a list of ISO codes with languages
            that are allowed in the combo box, if the list is empty, all languages
            are allowed (the default)
            """
            QtGui.QComboBox.__init__(self, parent)
            AbstractCustomEditor.__init__(self)
            self.setObjectName( field_name )
            self.index_by_language = dict()
            languages = [QtCore.QLocale(lang).language() for lang in languages]
            if not self.language_choices:
                for language in range(QtCore.QLocale.C, QtCore.QLocale.Chewa + 1):
                    if languages and (language not in languages):
                        continue
                    language_name = unicode( QtCore.QLocale.languageToString( language ))
                    self.language_choices.append( (language, language_name ) )
                self.language_choices.sort(key=lambda x:x[1])
            for i, (language, language_name) in enumerate( self.language_choices ):
                self.addItem( language_name, QtCore.QVariant(language) )
                self.index_by_language[ language ] = i
            self.activated.connect( self._activated )

        @QtCore.pyqtSlot(int)
        def _activated(self, _index):
            self.editingFinished.emit()

        def set_value(self, value):
            value = AbstractCustomEditor.set_value(self, value)
            if value:
                locale = QtCore.QLocale( value )
                self.setCurrentIndex( self.index_by_language[locale.language()] )

        def get_value(self):
            from camelot.core.utils import variant_to_pyobject
            current_index = self.currentIndex()
            if current_index >= 0:
                language = variant_to_pyobject(self.itemData(self.currentIndex()))
                locale = QtCore.QLocale( language )
                value = unicode( locale.name() )
            else:
                value = None
            return AbstractCustomEditor.get_value(self) or value

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