core (widgets handler): refactoring: - CagouWidget now has class properties (to be overridden when needed) which indicate how if the widget handle must add a wrapping ScreenManager (global_screen_manager) or show all instances of the class in a Carousel (collection_carousel). If none of those options is used, a ScrollView will be wrapping the widget, to be sure that the widget will be resized correctly when necessary (without it, the widget could still be drawn in the backround when the size is too small and overflow on the WidgetWrapper, this would be the case with WidgetSelector) - some helper methods/properties have been added to CagouWidget. Check docstrings for details - better handling of (in)visible widget in WidgetsHandler - thanks to the new wrapping ScrollView, WidgetSelect will show scroll bars if the available space is too small. - bugs fixes

#!/usr//bin/env python3
# -*- coding: utf-8 -*-

# Cagou: desktop/mobile frontend for Salut à Toi XMPP client
# Copyright (C) 2016-2018 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import cagou

if __name__ == "__main__":
    cagou.run()