#!/usr/bin/python -Es

# -*- coding: utf-8 -*-

#

# Copyright (C) 2016 Red Hat, Inc.

#

# Authors:

# Thomas Woerner <twoerner@redhat.com>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 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 General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#

class NiceExpander(object):

    def __init__(self, expanded_button, unexpanded_button, paned, child):

        self.expanded_button = expanded_button

        self.unexpanded_button = unexpanded_button

        self.paned = paned

        self.child = child

        self.sensitive = True

        self.expanded = False

        self.callback = { }

        self.parent = self.expanded_button.get_parent()

        self.expanded_button.connect("clicked", self.expand_cb)

        self.unexpanded_button.connect("clicked", self.unexpand_cb)

        self.set_expanded(True)

    def expand_cb(self, *args):

        self.expanded = False

        self.expanded_button.hide()

        self.unexpanded_button.show()

        self.child.hide()

        width = self.unexpanded_button.get_allocated_width()

        width += self.parent.get_border_width()*2

        self.paned.set_position(width)

        self.call_notify_expanded()

    def unexpand_cb(self, *args):

        self.expanded = True

        self.expanded_button.show()

        self.unexpanded_button.hide()

        self.child.show()

        width = self.expanded_button.get_allocated_width()

        width += self.parent.get_border_width()*2

        self.paned.set_position(width)

        self.call_notify_expanded()

    def set_expanded(self, flag):

        self.expanded = flag

        if flag:

            self.unexpand_cb()

        else:

            self.expand_cb()

    def get_expanded(self):

        return self.expanded

    def connect(self, name, callback, *args):

        if name == "notify::expanded":

            self.callback[name] = (callback, args)

        else:

            raise ValueError("Unknown callback name '%s'" % name)

    def call_notify_expanded(self):

        name = "notify::expanded"

        if name in self.callback:

            cb = self.callback[name]

            try:

                cb[0](*cb[1])

            except Exception as msg:

                print(msg)

    def set_sensitive(self, value):

        self.expanded_button.set_sensitive(value)

        self.unexpanded_button.set_sensitive(value)

        self.child.set_sensitive(value)

    def get_sensitive(self):

        return self.expanded_button.get_sensitive()

    def is_sensitive(self):

        return self.expanded_button.is_sensitive()