Mitter/mitterlib/ui/ui_pygtk.py

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

# Mitter, a micro-blogging client with multiple interfaces.
# Copyright (C) 2007-2010  Mitter Contributors
#
# 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 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 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/>.

import gobject
import gtk

gobject.threads_init()

import logging
import urllib2
import gettext
import datetime

from mitterlib.ui.helpers.image_helpers import find_image
from mitterlib.ui.helpers.gtk_threading import ThreadManager
from mitterlib.ui.helpers.gtk_updatebox import UpdateBox
from mitterlib.ui.helpers.gtk_messagegrid import MessageGrid
from mitterlib.ui.helpers.gdk_avatarcache import AvatarCache
from mitterlib.constants import gpl_3, version

# ----------------------------------------------------------------------
# Constants
# ----------------------------------------------------------------------

_log = logging.getLogger('ui.pygtk')

# ----------------------------------------------------------------------
# I18n bits
# ----------------------------------------------------------------------
t = gettext.translation('ui_pygtk', fallback=True)
_ = t.gettext
N_ = t.ngettext

# ----------------------------------------------------------------------
# Mitter interface object
# ----------------------------------------------------------------------

class Interface(object):
    """Linux/GTK interface for Mitter."""

    NAMESPACE = 'pygtk'
    PRIORITY = 20

    # ------------------------------------------------------------
    # Widget creation functions
    # ------------------------------------------------------------
    def _create_main_window(self):
        """Returns the object with the main window and the attached
        widgets."""
        main_window = gtk.Window(gtk.WINDOW_TOPLEVEL)

        initial_width = int(self._options[self.NAMESPACE]['width'])
        initial_height = int(self._options[self.NAMESPACE]['height'])
        _log.debug('Initial size: %d x %d', initial_width, initial_height)

        initial_x = int(self._options[self.NAMESPACE]['position_x'])
        initial_y = int(self._options[self.NAMESPACE]['position_y'])
        _log.debug('Initial position: %d x %d', initial_x, initial_y)

        main_window.set_title('Mitter')
        main_window.set_size_request(450, 300) # very small minimal size
        main_window.resize(initial_width, initial_height)
        main_window.move(initial_x, initial_y)

        if self._images['icon']:
            main_window.set_icon(self._images['icon'])

        (menu, toolbar, accelerators) = self._create_menu_and_toolbar()
        self._update_field = UpdateBox(
                self._images['avatar'],
                self._options[self.NAMESPACE]['spell_check'])
        self._statusbar = self._create_statusbar()

        # the messages grid
        messages = MessageGrid(self._avatars)
        messages.link_color = self._options[self.NAMESPACE]['link_color']
        messages.unread_char = self._options[self.NAMESPACE]['unread_char']
        messages.favorite_char = (
                self._options[self.NAMESPACE]['favorite_char'])
        messages.unfavorite_char = (
                self._options[self.NAMESPACE]['unfavorite_char'])
        messages.protected_char = (
                self._options[self.NAMESPACE]['protected_char'])
        messages.connect('count-changed', self._update_message_count)
        messages.connect('message-changed', self._message_changed)

        # replies grid
        replies = MessageGrid(self._avatars)
        replies.link_color = self._options[self.NAMESPACE]['link_color']
        replies.unread_char = self._options[self.NAMESPACE]['unread_char']
        replies.favorite_char = (
                self._options[self.NAMESPACE]['favorite_char'])
        replies.unfavorite_char = (
                self._options[self.NAMESPACE]['unfavorite_char'])
        replies.protected_char = (
                self._options[self.NAMESPACE]['protected_char'])
        replies.connect('count-changed', self._update_replies_count)
        replies.connect('message-changed', self._message_changed)

        self._main_tabs = gtk.Notebook()
        self._main_tabs.insert_page(messages, gtk.Label('Messages (0)'))
        self._main_tabs.insert_page(replies, gtk.Label('Replies (0)'))

        update_box = gtk.VBox()
        update_box.set_property('border_width', 2)
        update_box.pack_start(self._main_tabs, expand=True, fill=True,
                padding=0)
        update_box.pack_start(self._update_field, expand=False, fill=False,
                padding=0)

        box = gtk.VBox(False, 1)
        box.pack_start(menu, False, True, 0)
        box.pack_start(toolbar, False, False, 0)
        box.pack_start(update_box, True, True, 0)
        box.pack_start(self._statusbar, False, False, 0)
        main_window.add(box)
        main_window.add_accel_group(accelerators)

        # show widgets (except the update box, which will be shown when
        # requested)
        menu.show_all()
        toolbar.show_all()
        update_box.show()
        self._main_tabs.show_all()
        self._statusbar.show_all()
        box.show()

        # now that all elements are created, connect the signals
        main_window.connect('destroy', self._quit_app)
        main_window.connect('delete-event', self._quit_app)
        main_window.connect('size-request', self._window_resize)

        self._update_field.connect('text-focus', self._on_textarea_focus)

        return main_window

    def _create_menu_and_toolbar(self):
        """Create the main menu and the toolbar."""

        # UI elements
        ui_elements = '''
        <ui>
          <toolbar name="MainToolbar">
            <toolitem action="Refresh" />
            <toolitem action="Clear" />
            <toolitem action="AllRead" />
            <separator />
            <toolitem action="New" />
            <toolitem action="Delete" />
            <toolitem action="Reply" />
            <toolitem action="Repost" />
            <toolitem action="Favorite" />
            <separator />
            <toolitem action="Settings" />
            <toolitem action="Quit" />
          </toolbar>
          <menubar name="MainMenu">
            <menu action="File">
              <menuitem action="Quit" />
            </menu>
            <menu action="Edit">
              <menuitem action="Refresh" />
              <menuitem action="Clear" />
              <menuitem action="AllRead" />
              <separator />
              <menuitem action="Update" />
              <menuitem action="Cancel" />
              <separator />
              <menuitem action="Settings" />
            </menu>
            <menu action="View">
              <menuitem action="Messages" />
              <menuitem action="Replies" />
            </menu>
            <menu action="Message">
              <menuitem action="New" />
              <menuitem action="Delete" />
              <menuitem action="Reply" />
              <menuitem action="Repost" />
              <menuitem action="Favorite" />
            </menu>
            <menu action="Help">
              <menuitem action="About" />
            </menu>
          </menubar>
        </ui>
        '''

        # The group with all actions; we are going to split them using the
        # definitions inside the XML.
        self._action_group = gtk.ActionGroup('Mitter')

        # Actions related to the UI elements above
        # Top-level menu actions
        file_action = gtk.Action('File', _('_File'), _('File'), None)
        self._action_group.add_action(file_action)

        edit_action = gtk.Action('Edit', _('_Edit'), _('Edit'), None)
        self._action_group.add_action(edit_action)

        message_action = gtk.Action('Message', _('_Message'),
                _('Message related options'), None)
        self._action_group.add_action(message_action)

        view_action = gtk.Action('View', _('_View'), _('View'), None)
        self._action_group.add_action(view_action)

        help_action = gtk.Action('Help', _('_Help'), _('Help'), None)
        self._action_group.add_action(help_action)

        # File actions
        quit_action = gtk.Action('Quit', _('_Quit'),
                _('Exit Mitter'), gtk.STOCK_QUIT)
        quit_action.connect('activate', self._quit_app)
        self._action_group.add_action_with_accel(quit_action, None)

        # Edit actions
        refresh_action = gtk.Action('Refresh', _('_Refresh'),
                _('Update the listing'), gtk.STOCK_REFRESH)
        refresh_action.connect('activate', self._refresh)
        self._action_group.add_action_with_accel(refresh_action, None)

        clear_action = gtk.Action('Clear', _('_Clear'),
                _('Clear the message list'), gtk.STOCK_CLEAR)
        clear_action.connect('activate', self._clear_posts)
        self._action_group.add_action_with_accel(clear_action, '<Ctrl>l')

        all_read_action = gtk.Action('AllRead', _('_Mark All Read'),
                _('Mark all messages as read'), gtk.STOCK_APPLY)
        all_read_action.connect('activate', self._mark_all_read)
        self._action_group.add_action(all_read_action)

        update_action = gtk.Action('Update', _('_Update'),
                _('Update your status'), gtk.STOCK_ADD)
        update_action.connect('activate', self._update_status)
        self._action_group.add_action_with_accel(update_action, 'Return')

        cancel_action = gtk.Action('Cancel', _('_Cancel'),
                _('Cancel the update'), gtk.STOCK_CANCEL)
        cancel_action.connect('activate', self._clear_text)
        self._action_group.add_action_with_accel(cancel_action, 'Escape')

        settings_action = gtk.Action('Settings', _('_Settings'),
                _('Settings'), gtk.STOCK_PREFERENCES)
        settings_action.connect('activate', self._show_settings)
        self._action_group.add_action(settings_action)

        # Message actions
        new_action = gtk.Action('New', _('_New'),
                _('Post a new message'), gtk.STOCK_ADD)
        new_action.connect('activate', self._new_message)
        self._action_group.add_action_with_accel(new_action, '<Ctrl>n')

        delete_action = gtk.Action('Delete', _('_Delete'),
                _('Delete a post'), gtk.STOCK_DELETE)
        delete_action.set_property('sensitive', False)
        delete_action.connect('activate', self._delete_message)
        self._action_group.add_action_with_accel(delete_action, 'Delete')

        reply_action = gtk.Action('Reply', _('_Reply'),
                _("Send a response to someone's else message"),
                gtk.STOCK_REDO)
        reply_action.set_property('sensitive', False)
        reply_action.connect('activate', self._reply_message)
        self._action_group.add_action_with_accel(reply_action, '<Ctrl>r')

        repost_action = gtk.Action('Repost', _('Re_post'),
                _("Put someone's else message on your timeline"),
                gtk.STOCK_CONVERT)
        repost_action.set_property('sensitive', False)
        repost_action.connect('activate', self._repost_message)
        self._action_group.add_action_with_accel(repost_action, '<Ctrl>p')

        favorite_action = gtk.Action('Favorite', _('_Favorite'),
                _('Toggle the favorite status of a message'),
                gtk.STOCK_ABOUT)
        favorite_action.set_property('sensitive', False)
        favorite_action.connect('activate', self._favorite_message)
        self._action_group.add_action_with_accel(favorite_action, '<Ctrl>f')

        # view actions
        view_messages_action = gtk.Action('Messages', _('_Messages'),
                _('Display messages'), None)
        view_messages_action.connect('activate', self._change_tab, 0)
        self._action_group.add_action_with_accel(view_messages_action,
                '<Alt>1')

        view_replies_action = gtk.Action('Replies', _('_Replies'),
                _('Display replies'), None)
        view_replies_action.connect('activate', self._change_tab, 1)
        self._action_group.add_action_with_accel(view_replies_action, '<Alt>2')

        # Help actions
        about_action = gtk.Action('About', _('_About'), _('About Mitter'),
                gtk.STOCK_ABOUT)
        about_action.connect('activate', self._show_about)
        self._action_group.add_action(about_action)

        # definition of the UI
        uimanager = gtk.UIManager()
        uimanager.insert_action_group(self._action_group, 0)
        uimanager.add_ui_from_string(ui_elements)

        main_menu = uimanager.get_widget('/MainMenu')
        main_toolbar = uimanager.get_widget('/MainToolbar')

        return (main_menu, main_toolbar, uimanager.get_accel_group())

    def _create_statusbar(self):
        """Create the statusbar."""
        statusbar = gtk.Statusbar()
        self._statusbar_context = statusbar.get_context_id('Mitter')
        return statusbar

    def _show_about(self, widget):
        """Show the about dialog."""
        about_window = gtk.AboutDialog()
        about_window.set_name('Mitter')
        about_window.set_version(version)
        about_window.set_copyright('2007-2010 Mitter Contributors')
        about_window.set_license(gpl_3)
        about_window.set_website('http://code.google.com/p/mitter')
        about_window.set_website_label(_('Mitter project page'))
        about_window.set_authors([
            'Main developers:',
            'Julio Biason',
            'Deepak Sarda',
            'Gerald Kaszuba',
            ' ',
            'And patches from:',
            'Santiago Gala',
            'Sugree Phatanapherom',
            'Kristian Rietveld',
            '"Wiennat"',
            'Philip Reynolds',
            'Greg McIntyre',
            '"Alexander"',
            'Renato Covarrubias'])
        if self._images['logo']:
            about_window.set_logo(self._images['logo'])
        about_window.run()
        about_window.hide()

    # ------------------------------------------------------------
    # Helper functions
    # ------------------------------------------------------------
    def _update_statusbar(self, message):
        """Update the statusbar with the message."""
        self._statusbar.pop(self._statusbar_context)
        self._statusbar.push(self._statusbar_context, message)
        return

    def _refresh(self, widget=None):
        """Request a refresh. *widget* is the widget that called this
        function (we basically ignore it.)"""

        # disable the refresh from the menu, so we don't get duplicate
        # results.
        refresh = self._action_group.get_action('Refresh');
        refresh.set_property('sensitive', False)

        if self._refresh_id:
            # "De-queue" the next refresh
            _log.debug('Dequeuing next refresh')
            gobject.source_remove(self._refresh_id)
            self._refresh_id = None

        # do the refresh
        self._update_statusbar(_('Retrieving messages...'))
        self._threads.add_work(self._post_get_messages,
                self._exception_get_messages,
                self._connection.messages)

        return

    def _clear_reply(self):
        """Clear the info about a reply."""
        self._reply_message_id = None
        return

    def _update_title(self, messages, replies):
        """Update the window title with the information about the number of
        unread messages and unread replies."""
        title_info = {
                'message_count': str(messages),
                'message': N_('message', 'messages', messages),
                'replies_count': str(replies),
                'replies': N_('reply', 'replies', replies)}
        mask = self._options[self.NAMESPACE]['window_title']
        for variable in title_info:
            mask = mask.replace('{' + variable + '}', title_info[variable])

        self._main_window.set_title(mask)
        return

    def _hide_update_field(self):
        """Hides the update field and recheck the selected message for
        enabling (or not) the actions."""
        self._update_field.hide()
        page = self._main_tabs.get_current_page()
        child = self._main_tabs.get_nth_page(page)

        if child.selected:
            self._message_changed(child, child.selected)
        return

    # ------------------------------------------------------------
    # Widget callback functions
    # ------------------------------------------------------------
    def _message_changed(self, widget, data):
        """Callback from the MesageGrids when the selected message changes."""
        self._action_group.get_action('Delete').set_property('sensitive',
                data.deletable)
        self._action_group.get_action('Reply').set_property('sensitive',
                data.replyable)
        self._action_group.get_action('Repost').set_property('sensitive',
                data.repostable)
        self._action_group.get_action('Favorite').set_property('sensitive',
                data.favoritable)

        return

    def _update_message_count(self, widget, data):
        """Callback from the MessageGrid for messages when the number of
        messages changes."""
        child = self._main_tabs.get_nth_page(0)
        message = _('Messages (%d)') % (data)
        # do this specially for tabs since it seems really slow to update the
        # text (at least, on my computer); so we update only the required tab,
        # not both (even if we get both values here.)
        self._main_tabs.set_tab_label_text(child, message)

        replies = self._main_tabs.get_nth_page(1)
        self._update_title(data, replies.count)
        if self._statusicon:
            if (data + replies.count) > 0:
                self._statusicon.set_from_pixbuf(self._images['new-messages'])
                return

            self._statusicon.set_from_pixbuf(self._images['icon'])
        return

    def _update_replies_count(self, widget, data):
        """Callback from the MessageGrid for replies when the number of
        messages changes."""
        child = self._main_tabs.get_nth_page(1)
        message = _('Replies (%d)') % (data)
        self._main_tabs.set_tab_label_text(child, message)

        messages = self._main_tabs.get_nth_page(0)
        self._update_title(messages.count, data)
        if self._statusicon:
            if (data + messages.count) > 0:
                self._statusicon.set_from_pixbuf(self._images['new-messages'])
                return

            self._statusicon.set_from_pixbuf(self._images['icon'])
        return

    def _clear_posts(self, widget):
        """Clear the posts in the currently selected tab."""
        page = self._main_tabs.get_current_page()
        child = self._main_tabs.get_nth_page(page)
        child.clear_posts()
        return

    def _mark_all_read(self, widget):
        """Mark all messages as read in the currently selected tab."""
        page = self._main_tabs.get_current_page()
        child = self._main_tabs.get_nth_page(page)
        child.mark_all_read()
        return

    def _window_to_tray(self, statusicon, user_data=None):
        """Minimize/display main window (as in minimize to tray.)"""
        if self._main_window.get_property('visible'):
            self._main_window.hide()
        else:
            self._main_window.show()
        return

    def _update_status(self, widget):
        """Update your status."""
        if not self._update_field.get_property('visible'):
            self._update_field.show()
            return

        status = self._update_field.text.strip()
        if not status:
            _log.debug('Empty message, aborting.')
            self._hide_update_field()
            return

        page = self._main_tabs.get_current_page()
        child = self._main_tabs.get_nth_page(page)
        if child.selected:
            if child.selected.reply_prefix.strip() == status:
                _log.debug('Empty reply, aborting.')
                self._hide_update_field()
                return

        _log.debug('Status: %s', status)

        self._update_statusbar(_('Sending update...'))
        self._action_group.get_action('Update').set_sensitive(False)
        self._threads.add_work(self._post_update_status,
                self._exception_update_status,
                self._connection.update,
                status=status,
                reply_to=self._reply_message_id)
        return

    def _clear_text(self, widget):
        """Clear the text field."""
        self._clear_reply()
        self._hide_update_field()

        # change the focus to the grid.
        page = self._main_tabs.get_current_page()
        child = self._main_tabs.get_nth_page(page)
        child.get_child().grab_focus()  # notebook have ScrolledWindows,
                                        # TreeViews inside that.
        return

    def _quit_app(self, widget=None, user_data=None):
        """Callback when the window is destroyed or the user selects
        "Quit"."""

        (x, y) = self._main_window.get_position()
        _log.debug('Current position: %d x %d', x, y)
        self._options[self.NAMESPACE]['position_x'] = x
        self._options[self.NAMESPACE]['position_y'] = y

        (width, height) = self._main_window.get_size()
        _log.debug('Current window size: %d x %d', width, height)
        self._options[self.NAMESPACE]['width'] = width
        self._options[self.NAMESPACE]['height'] = height

        # TODO: Kill any threads running.
        self._threads.clear()
        gtk.main_quit()
        return

    def _window_resize(self, widget, requisition, data=None):
        """Called when the window is resized. We use it to set the proper
        word-wrapping in the message column."""
        (win_width, win_height) = self._main_window.get_size()
        total_tabs = self._main_tabs.get_n_pages()

        for page in range(0, total_tabs):
            child = self._main_tabs.get_nth_page(page)
            child.update_window_size(win_width)
        return

    def _delete_message(self, widget, user_data=None):
        """Delete a message."""
        page = self._main_tabs.get_current_page()
        message = self._main_tabs.get_nth_page(page).selected
        if not message:
            return

        confirm = gtk.MessageDialog(parent=self._main_window,
                type=gtk.MESSAGE_QUESTION,
                message_format=_('Delete this message?'),
                buttons=gtk.BUTTONS_YES_NO)
        option = confirm.run()
        confirm.hide()

        _log.debug("Option selected: %s" % (option))
        if option == -9:
            _log.debug("Delete cancelled")
            return False

        self._update_statusbar(_('Deleting message...'))
        _log.debug('Deleting messing %d', message.id)
        self._threads.add_work(self._post_delete_message,
                self._exception_delete_message,
                self._connection.delete_message,
                message)
        return

    def _reply_message(self, widget, user_data=None):
        """Reply to someone else's message."""
        page = self._main_tabs.get_current_page()
        grid = self._main_tabs.get_nth_page(page)
        message = grid.selected
        if not message:
            return

        self._update_field.text = message.reply_prefix
        self._reply_message_id = message
        self._update_field.show(message.author)
        return

    def _repost_message(self, widget, user_data=None):
        """Repost someone else's message on your timeline."""
        page = self._main_tabs.get_current_page()
        grid = self._main_tabs.get_nth_page(page)
        message = grid.selected
        if not message:
            return

        self._update_statusbar(_('Reposting %s message...') %
                (message.author.username))
        self._threads.add_work(self._post_repost_message,
                self._exception_repost_message,
                self._connection.repost,
                message)
        return

    def _favorite_message(self, widget, user_data=None):
        """Toggle the favorite status of a message."""
        page = self._main_tabs.get_current_page()
        grid = self._main_tabs.get_nth_page(page)
        message = grid.selected
        if not message:
            return

        # TODO: I removed the iterator for the grid; we need to find a wait to
        # the tell the grid a message was favorited

        if message.favorite:
            display = _('Removing message from %s from favorites...')
        else:
            display = _('Marking message from %s as favorite...')
        self._update_statusbar(display % (message.author.username))
        self._threads.add_work(self._post_favorite_message,
                self._exception_favorite_message,
                self._connection.favorite,
                message)
        return

    def _show_settings(self, widget, user_data=None):
        """Display the settings window."""
        settings_window = gtk.Dialog(title=_('Settings'),
                parent=self._main_window,
                flags=gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                buttons=(gtk.STOCK_OK, 0))

        # the tabs
        tabs = gtk.Notebook()

        # first page is the interface settings
        self._refresh_interval_field = gtk.SpinButton()
        self._refresh_interval_field.set_range(1, 99)
        self._refresh_interval_field.set_numeric(True)
        self._refresh_interval_field.set_value(
                self._options[self.NAMESPACE]['refresh_interval'])
        self._refresh_interval_field.set_increments(1, 5)

        interface_box = gtk.Table(rows=2, columns=1, homogeneous=False)
        interface_box.attach(gtk.Label(_('Refresh interval (minutes):')),
                0, 1, 0, 1)
        interface_box.attach(self._refresh_interval_field, 0, 1, 1, 2)
        interface_box.show_all()

        tabs.insert_page(interface_box, gtk.Label(_('Interface')))

        # second page is the network manager settings
        self._proxy_field = gtk.Entry()
        if self._options['NetworkManager']['proxy']:
            self._proxy_field.set_text(
                    self._options['NetworkManager']['proxy'])

        manager_box = gtk.Table(rows=1, columns=2, homogeneous=False)
        manager_box.attach(gtk.Label(_('Proxy:')), 0, 1, 0, 1)
        manager_box.attach(self._proxy_field, 0, 1, 1, 2)
        manager_box.show_all()

        tabs.insert_page(manager_box, gtk.Label(_('Networks')))

        # We store the fields in a dictionary, inside dictionaries for each
        # NAMESPACE. To set the values, we just run the dictionaries setting
        # self._options.
        self._fields = {self.NAMESPACE: {'refresh_interval':
            (self._refresh_interval_field, 'int')}}

        # next pages are each network settings
        net_options = self._connection.settings()
        for network in net_options:
            network_name = network['name']

            rows = len(network['options'])
            net_box = gtk.Table(rows=rows, columns=2, homogeneous=False)

            self._fields[network_name] = {}
            row = 0
            for option in network['options']:
                option_name = option['name']
                option_value = ''

                try:
                    option_value = self._options[network_name][option_name]
                except KeyError:
                    pass

                new_field = gtk.Entry()
                if option_value:
                    new_field.set_text(option_value)

                # Ony "str" and "passwd" are valid type and both use Entry()
                if option['type'] == 'passwd':
                    new_field.set_visibility(False)

                net_box.attach(gtk.Label(option_name), row, row+1, 0, 1)
                net_box.attach(new_field, row, row+1, 1, 2)

                row += 1

                self._fields[network_name][option_name] = (new_field,
                        option['type'])

            net_box.show_all()
            tabs.insert_page(net_box, gtk.Label(network_name))

        tabs.show_all()
        settings_window.vbox.pack_start(tabs, True, True, 0)
        settings_window.connect('response', self._update_settings)
        settings_window.run()
        settings_window.hide()

    def _update_settings(self, widget, response_id=0, user_data=None):
        """Update the interface settings."""
        for namespace in self._fields:
            for option in self._fields[namespace]:
                (field, field_type) = self._fields[namespace][option]
                value = field.get_text()
                if field_type == 'int':
                    value = int(value)
                self._options[namespace][option] = value

        self._options.save()
        return True

    def _change_tab(self, widget, user_data=None):
        """Change the notebook tab to display a differnt tab."""
        if not user_data:
            user_data = 0

        self._main_tabs.set_current_page(user_data)
        return

    def _on_textarea_focus(self, widget, user_data=None):
        """Called when the text area gets the focus. Just to add the counter
        again."""
        # disable the message actions (they will be activated properly when
        # the user leaves the textarea.)
        _log.debug('Disabling message actions due focus on textarea')
        self._action_group.get_action('Delete').set_property('sensitive',
                False)
        self._action_group.get_action('Reply').set_property('sensitive',
                False)
        self._action_group.get_action('Repost').set_property('sensitive',
                False)
        self._action_group.get_action('Favorite').set_property('sensitive',
                False)
        return

    def _new_message(self, widget, user_data=None):
        """Opens the text area for a new message."""
        self._update_field.show()
        return

    # ------------------------------------------------------------
    # Network related functions
    # ------------------------------------------------------------

    ### Results from the "messages" request
    def _post_get_messages(self, widget, results):
        """Function called after the data from the messages list is
        retrieved."""
        _log.debug('%d new tweets', len(results))

        grid = self._main_tabs.get_nth_page(0)
        grid.update(results)

        # now get replies
        self._update_statusbar(_('Retrieving replies...'))
        self._threads.add_work(self._post_get_replies,
                self._exception_get_messages,
                self._connection.replies)
        return

    def _exception_get_messages(self, widget, exception):
        """Function called if the retrival of current messages returns an
        exception."""
        _log.debug(str(exception))
        error_win = gtk.MessageDialog(parent=self._main_window,
                type=gtk.MESSAGE_ERROR,
                message_format=_('Error retrieving current messages. ' \
                        'Auto-refresh disabled. Use the "Refresh" option ' \
                        'to re-enable it.'),
                buttons=gtk.BUTTONS_OK)
        error_win.run()
        error_win.hide()
        self._update_statusbar(_('Auto-update disabled'))
        if self._statusicon:
            self._statusicon.set_from_pixbuf(self._images['icon-error'])

        # re-enable the refresh from the menu
        refresh = self._action_group.get_action('Refresh')
        refresh.set_property('sensitive', True)
        return

    ### replies callback
    def _post_get_replies(self, widget, results):
        """Called after we retrieve the replies."""
        grid = self._main_tabs.get_nth_page(1)
        grid.update(results)

        interval = self._options[self.NAMESPACE]['refresh_interval']

        # once our update went fine, we can queue the next one. This avoids
        # any problems if case there is an exception.
        now = datetime.datetime.now()
        delta = datetime.timedelta(seconds=interval*60)
        next_call = now + delta

        _log.debug('Queueing next refresh in %d minutes', interval)
        prefix = _('New messages retrieved.')
        suffix = N_('Next update in %d minute', 'Next update in %d minutes',
                interval)
        next_update = next_call.strftime('%H:%M:%S')
        # TODO: Check if the time format string should go in the config file.

        message = '%s %s (at %s).' % (prefix, suffix, next_update)
        self._update_statusbar(message % (interval))
        self._refresh_id = gobject.timeout_add(
                interval * 60 * 1000,
                self._refresh, None)

        # re-enable the refresh action
        refresh = self._action_group.get_action('Refresh')
        refresh.set_property('sensitive', True)
        return

    ### image download function
    def _download_pic(self, url):
        """Download a picture from the web. Can be used in a thread."""
        request = urllib2.Request(url=url)
        timeout = self._options['NetworkManager']['timeout']
        _log.debug('Starting request of %s (timeout %ds)' % (
            url, timeout))
        response = urllib2.urlopen(request, timeout=timeout)
        data = response.read()
        _log.debug('Request completed')
        return (url, data)

    ### Results from the avatar download request
    def _post_avatar_pic(self, widget, data):
        """Called after the data from the picture of the user's avatar is
        available."""
        (url, data) = data

        loader = gtk.gdk.PixbufLoader()
        loader.write(data)
        loader.close()

        self._update_field.pixbuf = loader.get_pixbuf()
        return

    def _exception_download_pic(self, widget, exception):
        """Called in case we have a problem downloading an user avatar."""
        _log.debug('Exception trying to get an avatar.')
        _log.debug(str(exception))
        return

    ### Results for the update status call
    def _post_update_status(self, widget, data):
        """Called when the status is updated correctly."""
        self._update_statusbar(_('Your status was updated.'))
        self._action_group.get_action('Update').set_sensitive(True)
        self._clear_text(None)

        # re-enable (or not) the actions based on the currently selected
        # message
        page = self._main_tabs.get_current_page()
        grid = self._main_tabs.get_nth_page(page)
        message = grid.selected

        if message:
            self._message_changed(grid, message)
        return

    def _exception_update_status(self, widget, exception):
        """Called when there is an exception updating the status."""
        _log.debug('Update error')
        _log.debug(str(exception))
        error_win = gtk.MessageDialog(parent=self._main_window,
                type=gtk.MESSAGE_ERROR,
                message_format=_('Error updating your status. Please ' \
                        'try again.'),
                buttons=gtk.BUTTONS_OK)
        error_win.run()
        error_win.hide()

        # re-enable the update, or the user won't be able to repost their
        # message.
        self._action_group.get_action('Update').set_sensitive(True)
        return

    ### Results for the delete message call
    def _post_delete_message(self, widget, message):
        """Called when the message is deleted successfully."""
        _log.debug('Message deleted.')
        # any grid can take care of deleting the message
        MessageGrid.delete(message)
        self._update_statusbar(_('Message deleted.'))
        return

    def _exception_delete_message(self, widget, exception):
        """Called when the message cannot be deleted."""
        _log.debug('Delete error')
        _log.debug(str(exception))
        return

    ### Results for the repost message call
    def _post_repost_message(self, widget, data):
        """Called when the message is reposted successfully."""
        _log.debug('Repost successful')
        self._update_statusbar(_('Message reposted'))
        return

    def _exception_repost_message(self, widget, exception):
        """Called when the message cannot be reposted."""
        _log.debug('Repost error.')
        _log.debug(str(exception))

        error_win = gtk.MessageDialog(parent=self._main_window,
                type=gtk.MESSAGE_ERROR,
                message_format=_('Error reposting message. Please ' \
                        'try again.'),
                buttons=gtk.BUTTONS_OK)
        error_win.run()
        error_win.hide()
        return

    ### Results from the favorite call
    def _post_favorite_message(self, widget, status):
        """Called when the message was favorited successfully."""
        _log.debug('Favorite status changed.')
        if status:
            display = _('Message favorited.')
        else:
            display = _('Message unfavorited.')
        self._update_statusbar(display)
        return

    def _exception_favorite_message(self, widget, exception):
        """Called when the message couldn't be favorited."""
        _log.debug('Favorite error.')
        _log.debug(str(exception))

        error_win = gtk.MessageDialog(parent=self._main_window,
                type=gtk.MESSAGE_ERROR,
                message_format=_('Error changing favorite status of the ' \
                        'message. Please, try again.'),
                buttons=gtk.BUTTONS_OK)
        error_win.run()
        error_win.hide()
        return

    # ------------------------------------------------------------
    # Required functions for all interfaces
    # ------------------------------------------------------------
    def __init__(self, connection, options):
        """Start the interface. `connection` is the :class:`Networks` object
        with all the available networks. `options` is the :class:`ConfigOpt`
        object with the configuration to run Mitter."""
        # Load images
        unknown_pixbuf = find_image('unknown.png')
        if unknown_pixbuf:
            default_pixmap = gtk.gdk.pixbuf_new_from_file(
                    unknown_pixbuf)
        else:
            default_pixmap = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,
                    has_alpha=False, bits_per_sample=8, width=48, height=48)

        self._images = {}
        self._images['avatar'] = default_pixmap
        self._images['logo'] = gtk.gdk.pixbuf_new_from_file(
                find_image('mitter-big.png'))

        self._connection = connection
        self._options = options

        # icons (app and statusicon)
        self._images['icon'] = gtk.gdk.pixbuf_new_from_file(
                find_image('mitter.png'))
        self._images['new-messages'] = gtk.gdk.pixbuf_new_from_file(
                find_image('mitter-new.png'))
        self._images['icon-error'] = gtk.gdk.pixbuf_new_from_file(
                find_image('mitter-error.png'))

        # This is the ugly bit for speeding up things and making
        # interthread communication.
        self._reply_message_id = None

        return

    def __call__(self):
        """Call function; displays the interface. This method should
        appear on every interface."""

        if self._options[self.NAMESPACE]['statusicon']:
            self._statusicon = gtk.StatusIcon()
            self._statusicon.set_from_pixbuf(self._images['icon'])
            self._statusicon.connect('activate', self._window_to_tray)
        else:
            self._statusicon = None

        self._threads = ThreadManager()
        self._avatars = AvatarCache(
                self._threads,
                self._images['avatar'],
                self._options['NetworkManager']['timeout'])

        self._main_window = self._create_main_window()
        self._main_window.show()

        # get a user avatar. We need that for the updatebox.
        user = self._connection.user()
        self._threads.add_work(self._post_avatar_pic,
                self._exception_download_pic,
                self._download_pic,
                user.avatar)

        # queue the first fetch
        self._refresh_id = None     # The auto-refresh manager.
        self._refresh()
        gtk.main()
        return

    @classmethod
    def options(self, options):
        """Add the options for this interface."""
        # Remember to update CHEAT-CODES in case you add or remove any
        # options.
        options.add_group(self.NAMESPACE, 'GTK+ Interface')
        options.add_option('--refresh-interval',
                group=self.NAMESPACE,
                option='refresh_interval',
                help=_('Refresh interval.'),
                type='int',
                metavar='MINUTES',
                default=5,
                conflict_group='interface')
        options.add_option('--disable-statusicon',
                group=self.NAMESPACE,
                action='store_false',
                option='statusicon',
                help=_('Disable the use of the status icon.'),
                default=True,
                conflict_group='interface')
        # Most of the description for non-cmd-options are useless, but
        # I'm keeping them as documentation.
        options.add_option(
                group=self.NAMESPACE,
                option='width',
                help='Window width',
                type='int',
                metavar='PIXELS',
                default=450,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='height',
                help='Window height',
                type='int',
                metavar='PIXELS',
                default=300,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='position_x',
                help='Window position on the X axis',
                type='int',
                metavar='PIXELS',
                default=5,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='position_y',
                help='Window position on the Y axis',
                type='int',
                metavar='PIXELS',
                default=5,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='link_color',
                help='Color of links in the interface',
                type='str',
                metavar='COLOR',
                default='blue',
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='spell_check',
                help='Spell checking update text',
                type='boolean',
                metavar='SPELL',
                default=False,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='unread_char',
                help='String to be used to indicate a message is unread.',
                metavar='CHAR',
                default='&#9679;',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='unfavorite_char',
                help='String to be used to indicate a message is not ' \
                        'marked as favorite.',
                metavar='CHAR',
                default='&#9733;',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='favorite_char',
                help='String to be used to indicate a message is marked ' \
                        'as favorite.',
                metavar='CHAR',
                default='&#9734;',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='protected_char',
                help='String to be used to indicate that a message is ' \
                        'protected/private.',
                metavar='CHAR',
                default=_('<small>(protected)</small>'),
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='window_title',
                help='Format string to be used in the title. Variables ' \
                        'can be accessed with {variable_name}. Mitter will ' \
                        'pass the following variables:\n' \
                        '"message_count": the number of unread messages,\n' \
                        '"message": the translatable word for ' \
                        '"message(s)",\n' \
                        '"replies_count": the number of unread replies,\n' \
                        '"replies": the translatable word for "replies"',
                metavar='STRING',
                default='Mitter ({message_count} {message}, ' \
                        '{replies_count} {replies})',
                is_cmd_option=False)