path: root/src/windows.py

# Copyright 2010-2011 Florent Le Coz <louiz@louiz.org>
#
# This file is part of Poezio.
#
# Poezio is free software: you can redistribute it and/or modify
# it under the terms of the zlib license. See the COPYING file.

"""
Define all the windows.
A window is a little part of the screen, for example the input window,
the text window, the roster window, etc.
A Tab (see tab.py) is composed of multiple Windows
"""

from gettext import (bindtextdomain, textdomain, bind_textdomain_codeset,
                     gettext as _)
from os.path import isfile

import logging
log = logging.getLogger(__name__)

import shlex
import curses
import string
from config import config

from threading import Lock

from contact import Contact, Resource
from roster import RosterGroup, roster
from poopt import cut_text

from sleekxmpp.xmlstream.stanzabase import JID

import core
import common
import wcwidth
import singleton
import collections

from theming import get_theme, to_curses_attr

allowed_color_digits = ('0', '1', '2', '3', '4', '5', '6', '7')
# msg is a reference to the corresponding Message tuple. text_start and text_end are the position
# delimiting the text in this line.
# first is a bool telling if this is the first line of the message.
Line = collections.namedtuple('Line', 'msg start_pos end_pos')

g_lock = Lock()

LINES_NB_LIMIT = 4096

def truncate_nick(nick, size=25):
    if nick and len(nick) >= size:
        return nick[:size]+'…'
    return nick


class Win(object):
    _win_core = None
    def __init__(self):
        self._win = None

    def _resize(self, height, width, y, x):
        self.height, self.width, self.x, self.y = height, width, x, y
        if height == 0 or width == 0:
            return
        if not self._win:
            self._win = curses.newwin(height, width, y, x)
        else:
            try:
                self._win.resize(height, width)
                self._win.mvwin(y, x)
            except:
                log.debug('DEBUG: mvwin returned ERR. Please investigate')

    def resize(self, height, width, y, x):
        """
        Override if something has to be done on resize
        """
        self._resize(height, width, y, x)

    def _refresh(self):
        self._win.noutrefresh()

    def addnstr(self, *args):
        """
        Safe call to addnstr
        """
        try:
            self._win.addnstr(*args)
        except:
            pass

    def addstr(self, *args):
        """
        Safe call to addstr
        """
        try:
            self._win.addstr(*args)
        except:
            pass

    def move(self, y, x):
        try:
            self._win.move(y, x)
        except:
            self._win.move(0, 0)

    def addstr_colored(self, text, y=None, x=None):
        """
        Write a string on the window, setting the
        attributes as they are in the string.
        For example:
        \x19bhello → hello in bold
        \x191}Bonj\x192}our → 'Bonj' in red and 'our' in green
        next_attr_char is the \x19 delimiter
        attr_char is the char following it, it can be
        one of 'u', 'b', 'c[0-9]'
        """
        if y is not None and x is not None:
            self.move(y, x)
        next_attr_char = text.find('\x19')
        while next_attr_char != -1 and text:
            if next_attr_char + 1 < len(text):
                attr_char = text[next_attr_char+1].lower()
            else:
                attr_char = str()
            if next_attr_char != 0:
                self.addstr(text[:next_attr_char])
            if attr_char == 'o':
                self._win.attrset(0)
            elif attr_char == 'u':
                self._win.attron(curses.A_UNDERLINE)
            elif attr_char == 'b':
                self._win.attron(curses.A_BOLD)
            if attr_char in string.digits and attr_char != '':
                color_str = text[next_attr_char+1:text.find('}', next_attr_char)]
                self._win.attron(to_curses_attr((int(color_str), -1)))
                text = text[next_attr_char+len(color_str)+2:]
            else:
                text = text[next_attr_char+2:]
            next_attr_char = text.find('\x19')
        self.addstr(text)

    def addstr_colored_lite(self, text, y=None, x=None):
        """
        Just like addstr_colored, but only handles colors with one digit.
        \x193 is the 3rd color. We do not use any } char in this version
        """
        if y is not None and x is not None:
            self.move(y, x)
        next_attr_char = text.find('\x19')
        while next_attr_char != -1:
            if next_attr_char + 1 < len(text):
                attr_char = text[next_attr_char+1].lower()
            else:
                attr_char = str()
            if next_attr_char != 0:
                self.addstr(text[:next_attr_char])
            text = text[next_attr_char+2:]
            if attr_char == 'o':
                self._win.attrset(0)
            elif attr_char == 'u':
                self._win.attron(curses.A_UNDERLINE)
            elif attr_char == 'b':
                self._win.attron(curses.A_BOLD)
            elif attr_char in string.digits and attr_char != '':
                self._win.attron(to_curses_attr((int(attr_char), -1)))
            next_attr_char = text.find('\x19')
        self.addstr(text)

    def finish_line(self, color=None):
        """
        Write colored spaces until the end of line
        """
        (y, x) = self._win.getyx()
        size = self.width-x
        if color:
            self.addnstr(' '*size, size, to_curses_attr(color))
        else:
            self.addnstr(' '*size, size)

    @property
    def core(self):
        if not Win._win_core:
            Win._win_core = singleton.Singleton(core.Core)
        return Win._win_core

class UserList(Win):
    def __init__(self):
        Win.__init__(self)
        self.pos = 0
        self.color_role = {'moderator': get_theme().COLOR_USER_MODERATOR,
                           'participant':get_theme().COLOR_USER_PARTICIPANT,
                           'visitor':get_theme().COLOR_USER_VISITOR,
                           'none':get_theme().COLOR_USER_NONE,
                           '':get_theme().COLOR_USER_NONE
                           }
        self.color_show = {'xa':get_theme().COLOR_STATUS_XA,
                           'none':get_theme().COLOR_STATUS_NONE,
                           '':get_theme().COLOR_STATUS_NONE,
                           'dnd':get_theme().COLOR_STATUS_DND,
                           'away':get_theme().COLOR_STATUS_AWAY,
                           'chat':get_theme().COLOR_STATUS_CHAT
                           }

    def scroll_up(self):
        self.pos += self.height-1

    def scroll_down(self):
        self.pos -= self.height-1
        if self.pos < 0:
            self.pos = 0

    def draw_plus(self, y):
        self.addstr(y, self.width-2, '++', to_curses_attr(get_theme().COLOR_MORE_INDICATOR))

    def refresh(self, users):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            y = 0
            users = sorted(users)
            if self.pos >= len(users) and self.pos != 0:
                self.pos = len(users)-1
            for user in users[self.pos:]:
                if not user.role in self.color_role:
                    role_col = get_theme().COLOR_USER_NONE
                else:
                    role_col = self.color_role[user.role]
                if not user.show in self.color_show:
                    show_col = get_theme().COLOR_STATUS_NONE
                else:
                    show_col = self.color_show[user.show]
                if user.chatstate == 'composing':
                    char = 'X'
                elif user.chatstate == 'active':
                    char = 'A'
                elif user.chatstate == 'paused':
                    char = 'p'
                else:
                    char = get_theme().CHAR_STATUS
                self.addstr(y, 0, char, to_curses_attr(show_col))
                self.addstr(y, 1, user.nick[:self.width-2], to_curses_attr(role_col))
                y += 1
                if y == self.height:
                    break
            # draw indicators of position in the list
            if self.pos > 0:
                self.draw_plus(0)
            if self.pos + self.height < len(users):
                self.draw_plus(self.height-1)
            self._refresh()

    def resize(self, height, width, y, x):
        self._resize(height, width, y, x)
        self._win.attron(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
        self._win.vline(0, 0, curses.ACS_VLINE, self.height)
        self._win.attroff(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))

class Topic(Win):
    def __init__(self):
        Win.__init__(self)
        self._message = ''

    def refresh(self, topic=None):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            if topic:
                msg = topic[:self.width-1]
            else:
                msg = self._message[:self.width-1]
            self.addstr(0, 0, msg, to_curses_attr(get_theme().COLOR_TOPIC_BAR))
            (y, x) = self._win.getyx()
            remaining_size = self.width - x
            if remaining_size:
                self.addnstr(' '*remaining_size, remaining_size,
                             to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self._refresh()

    def set_message(self, message):
        self._message = message

class GlobalInfoBar(Win):
    def __init__(self):
        Win.__init__(self)

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        def compare_room(a):
            return a.nb
        comp = lambda x: x.nb
        with g_lock:
            self._win.erase()
            self.addstr(0, 0, "[", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            sorted_tabs = sorted(self.core.tabs, key=comp)
            for tab in sorted_tabs:
                color = tab.get_color_state()
                if config.get('show_inactive_tabs', 'true') == 'false' and\
                        color == get_theme().COLOR_TAB_NORMAL:
                    continue
                try:
                    self.addstr("%s" % str(tab.nb), to_curses_attr(color))
                    self.addstr("|", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
                except:             # end of line
                    break
            (y, x) = self._win.getyx()
            self.addstr(y, x-1, '] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            (y, x) = self._win.getyx()
            remaining_size = self.width - x
            self.addnstr(' '*remaining_size, remaining_size,
                         to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self._refresh()

class InfoWin(Win):
    """
    Base class for all the *InfoWin, used in various tabs. For example
    MucInfoWin, etc. Provides some useful methods.
    """
    def __init__(self):
        Win.__init__(self)

    def print_scroll_position(self, window):
        """
        Print, link in Weechat, a -PLUS(n)- where n
        is the number of available lines to scroll
        down
        """
        if window.pos > 0:
            plus = ' -PLUS(%s)-' % window.pos
            self.addstr(plus, to_curses_attr(get_theme().COLOR_SCROLLABLE_NUMBER))

class PrivateInfoWin(InfoWin):
    """
    The live above the information window, displaying informations
    about the MUC user we are talking to
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, room, window, chatstate):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            self.write_room_name(room)
            self.print_scroll_position(window)
            self.write_chatstate(chatstate)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_room_name(self, room):
        jid = JID(room.name)
        room_name, nick = jid.bare, jid.resource
        self.addstr(nick, to_curses_attr(get_theme().COLOR_PRIVATE_NAME))
        txt = ' from room %s' % room_name
        self.addstr(txt, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_chatstate(self, state):
        if state:
            self.addstr(' %s' % (state,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class ConversationInfoWin(InfoWin):
    """
    The line above the information window, displaying informations
    about the user we are talking to
    """
    color_show = {'xa':get_theme().COLOR_STATUS_XA,
                  'none':get_theme().COLOR_STATUS_ONLINE,
                  '':get_theme().COLOR_STATUS_ONLINE,
                  'available':get_theme().COLOR_STATUS_ONLINE,
                  'dnd':get_theme().COLOR_STATUS_DND,
                  'away':get_theme().COLOR_STATUS_AWAY,
                  'chat':get_theme().COLOR_STATUS_CHAT,
                  'unavailable':get_theme().COLOR_STATUS_UNAVAILABLE
                  }

    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, jid, contact, text_buffer, window, chatstate):
        # contact can be None, if we receive a message
        # from someone not in our roster. In this case, we display
        # only the maximum information from the message we can get.
        log.debug('Refresh: %s'%self.__class__.__name__)
        jid = JID(jid)
        if contact:
            if jid.resource:
                resource = contact.get_resource_by_fulljid(jid.full)
            else:
                resource = contact.get_highest_priority_resource()
        else:
            resource = None
        # if contact is None, then resource is None too: user is not in the roster
        # so we don't know almost anything about it
        # If contact is a Contact, then
        # resource can now be a Resource: user is in the roster and online
        # or resource is None: user is in the roster but offline
        with g_lock:
            self._win.erase()
            self.write_contact_jid(jid)
            self.write_contact_informations(contact)
            self.write_resource_information(resource)
            self.print_scroll_position(window)
            self.write_chatstate(chatstate)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_resource_information(self, resource):
        """
        Write the informations about the resource
        """
        if not resource:
            presence = "unavailable"
        else:
            presence = resource.get_presence()
        color = RosterWin.color_show[presence]
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(" ", to_curses_attr(color))
        self.addstr(']', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_contact_informations(self, contact):
        """
        Write the informations about the contact
        """
        if not contact:
            self.addstr("(contact not in roster)", to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            return
        display_name = contact.get_name() or contact.get_bare_jid()
        self.addstr('%s '%(display_name), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_contact_jid(self, jid):
        """
        Just write the jid that we are talking to
        """
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(jid.full, to_curses_attr(get_theme().COLOR_CONVERSATION_NAME))
        self.addstr('] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_chatstate(self, state):
        if state:
            self.addstr(' %s' % (state,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class ConversationStatusMessageWin(InfoWin):
    """
    The upper bar displaying the status message of the contact
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, jid, contact):
        log.debug('Refresh: %s'%self.__class__.__name__)
        jid = JID(jid)
        if contact:
            if jid.resource:
                resource = contact.get_resource_by_fulljid(jid.full)
            else:
                resource = contact.get_highest_priority_resource()
        else:
            resource = None
        with g_lock:
            self._win.erase()
            if resource:
                self.write_status_message(resource)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_status_message(self, resource):
        self.addstr(resource.get_status(), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class MucInfoWin(InfoWin):
    """
    The line just above the information window, displaying informations
    about the MUC we are viewing
    """
    def __init__(self):
        InfoWin.__init__(self)

    def refresh(self, room, window=None):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            self.write_room_name(room)
            self.write_own_nick(room)
            self.write_disconnected(room)
            self.write_role(room)
            if window:
                self.print_scroll_position(window)
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def write_room_name(self, room):
        self.addstr('[', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.addstr(room.name, to_curses_attr(get_theme().COLOR_GROUPCHAT_NAME))
        self.addstr('] ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_disconnected(self, room):
        """
        Shows a message if the room is not joined
        """
        if not room.joined:
            self.addstr(' -!- Not connected ', to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_own_nick(self, room):
        """
        Write our own nick in the info bar
        """
        nick = room.own_nick
        if not nick:
            return
        self.addstr(truncate_nick(nick, 13), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

    def write_role(self, room):
        """
        Write our own role and affiliation
        """
        own_user = None
        for user in room.users:
            if user.nick == room.own_nick:
                own_user = user
                break
        if not own_user:
            return
        txt = ' ('
        if own_user.affiliation != 'none':
            txt += own_user.affiliation+', '
        txt += own_user.role+')'
        self.addstr(txt, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))

class TextWin(Win):
    def __init__(self, lines_nb_limit=config.get('max_lines_in_memory', 2048)):
        Win.__init__(self)
        self.lines_nb_limit = lines_nb_limit
        self.pos = 0
        self.built_lines = []   # Each new message is built and kept here.
        # on resize, we rebuild all the messages

    def scroll_up(self, dist=14):
        self.pos += dist
        if self.pos + self.height > len(self.built_lines):
            self.pos = len(self.built_lines) - self.height
            if self.pos < 0:
                self.pos = 0

    def scroll_down(self, dist=14):
        self.pos -= dist
        if self.pos <= 0:
            self.pos = 0

    def scroll_to_separator(self):
        """
        Scroll until separator is centered. If no separator is
        present, scroll at the top of the window
        """
        if None in self.built_lines:
            self.pos = self.built_lines.index(None)
            # Chose a proper position (not too high)
            self.scroll_up(0)
        else:                   # Go at the top of the win
            self.pos = len(self.built_lines) - self.height

    def remove_line_separator(self):
        """
        Remove the line separator
        """
        log.debug('remove_line_separator')
        if None in self.built_lines:
            self.built_lines.remove(None)

    def add_line_separator(self):
        """
        add a line separator at the end of messages list
        """
        if None not in self.built_lines:
            self.built_lines.append(None)

    def build_new_message(self, message, history=None, clean=True):
        """
        Take one message, build it and add it to the list
        Return the number of lines that are built for the given
        message.
        """
        if message is None:  # line separator
            self.built_lines.append(None)
            return 0
        txt = message.txt
        if not txt:
            return 0
        nick = truncate_nick(message.nickname)
        offset = 1 + len(message.str_time)
        if nick:
            offset += wcwidth.wcswidth(nick) + 2 # + nick + spaces length
        if get_theme().CHAR_TIME_LEFT:
            offset += 1
        if get_theme().CHAR_TIME_RIGHT:
            offset += 1
        lines = cut_text(txt, self.width-offset)
        for line in lines:
            self.built_lines.append(Line(msg=message,
                                         start_pos=line[0],
                                         end_pos=line[1]))
        if clean:
            while len(self.built_lines) > self.lines_nb_limit:
                self.built_lines.pop(0)
            return len(lines)

    def refresh(self, room):
        log.debug('Refresh: %s'%self.__class__.__name__)
        if self.height <= 0:
            return
        if self.pos == 0:
            lines = self.built_lines[-self.height:]
        else:
            lines = self.built_lines[-self.height-self.pos:-self.pos]
        self._win.move(0, 0)
        with g_lock:
            self._win.erase()
            for y, line in enumerate(lines):
                if line:
                    msg = line.msg
                    if line.start_pos == 0:
                        if msg.nick_color:
                            color = msg.nick_color
                        elif msg.user:
                            color = msg.user.color
                        else:
                            color = None
                        self.write_time(msg.str_time)
                        self.write_nickname(msg.nickname, color)
                if y != self.height-1:
                    self.addstr('\n')
            self._win.attrset(0)
            for y, line in enumerate(lines):
                if not line:
                    self.write_line_separator()
                else:
                    self.write_text(y, (3 if line.msg.nickname else 1) + len(line.msg.str_time)+len(truncate_nick(line.msg.nickname) or ''), line.msg.txt[line.start_pos:line.end_pos])
                if y != self.height-1:
                    self.addstr('\n')
            self._win.attrset(0)
            self._refresh()

    def write_line_separator(self):
        self.addnstr('- '*(self.width//2-1)+'-', self.width, to_curses_attr(get_theme().COLOR_NEW_TEXT_SEPARATOR))

    def write_text(self, y, x, txt):
        """
        write the text of a line.
        """
        self.addstr_colored(txt, y, x)

    def write_nickname(self, nickname, color):
        """
        Write the nickname, using the user's color
        and return the number of written characters
        """
        if not nickname:
            return
        if color:
            self._win.attron(to_curses_attr(color))
        self.addstr(truncate_nick(nickname))
        if color:
            self._win.attroff(to_curses_attr(color))
        self.addstr("> ")

    def write_time(self, time):
        """
        Write the date on the yth line of the window
        """
        if time:
            self.addstr(time)
            self.addstr(' ')

    def resize(self, height, width, y, x, room=None):
        self._resize(height, width, y, x)
        if room:
            self.rebuild_everything(room)

    def rebuild_everything(self, room):
        self.built_lines = []
        for message in room.messages:
            self.build_new_message(message, clean=False)
        while len(self.built_lines) > self.lines_nb_limit:
            self.built_lines.pop(0)

    def __del__(self):
        log.debug('** TextWin: deleting %s built lines' % (len(self.built_lines)))
        del self.built_lines

class HelpText(Win):
    """
    A Window just displaying a read-only message.
    Usually used to replace an Input when the tab is in
    command mode.
    """
    def __init__(self, text=''):
        Win.__init__(self)
        self.txt = text

    def refresh(self, txt=None):
        log.debug('Refresh: %s'%self.__class__.__name__)
        if txt:
            self.txt = txt
        with g_lock:
            self._win.erase()
            self.addstr(0, 0, self.txt[:self.width-1], to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            self.finish_line(get_theme().COLOR_INFORMATION_BAR)
            self._refresh()

    def do_command(self, key):
        return False

class Input(Win):
    """
    The simplest Input possible, provides just a way to edit a single line
    of text. It also has a clipboard, common to all Inputs.
    Doesn't have any history.
    It doesn't do anything when enter is pressed either.
    This should be herited for all kinds of Inputs, for example MessageInput
    or the little inputs in dataforms, etc, adding specific features (completion etc)
    It features two kinds of completion, but they have to be called from outside (the Tab),
    passing the list of items that can be used to complete. The completion can be used
    in a very flexible way.
    """
    clipboard = '' # A common clipboard for all the inputs, this makes
    # it easy cut and paste text between various input
    def __init__(self):
        self.key_func = {
            "KEY_LEFT": self.key_left,
            "M-D": self.key_left,
            "KEY_RIGHT": self.key_right,
            "M-C": self.key_right,
            "KEY_END": self.key_end,
            "KEY_HOME": self.key_home,
            "KEY_DC": self.key_dc,
            '^D': self.key_dc,
            'M-b': self.jump_word_left,
            "M-[1;5D": self.jump_word_left,
            '^W': self.delete_word,
            '^K': self.delete_end_of_line,
            '^U': self.delete_begining_of_line,
            '^Y': self.paste_clipboard,
            '^A': self.key_home,
            '^E': self.key_end,
            'M-f': self.jump_word_right,
            "M-[1;5C": self.jump_word_right,
            "KEY_BACKSPACE": self.key_backspace,
            "M-KEY_BACKSPACE": self.delete_word,
            '^?': self.key_backspace,
            '^J': self.add_line_break,
            }
        Win.__init__(self)
        self.text = ''
        self.pos = 0            # cursor position
        self.line_pos = 0 # position (in self.text) of
        self.on_input = None    # callback called on any key pressed
        self.color = None       # use this color on addstr

    def on_delete(self):
        """
        Remove all references kept to a tab, so that the tab
        can be garbage collected
        """
        del self.key_func

    def set_color(self, color):
        self.color = color
        self.rewrite_text()

    def is_empty(self):
        return len(self.text) == 0

    def jump_word_left(self):
        """
        Move the cursor one word to the left
        """
        if not len(self.text) or self.pos == 0:
            return
        separators = string.punctuation+' '
        while self.pos > 0 and self.text[self.pos+self.line_pos-1] in separators:
            self.key_left()
        while self.pos > 0 and self.text[self.pos+self.line_pos-1] not in separators:
            self.key_left()
        return True

    def jump_word_right(self):
        """
        Move the cursor one word to the right
        """
        if len(self.text) == self.pos+self.line_pos or not len(self.text):
            return
        separators = string.punctuation+' '
        while len(self.text) != self.pos+self.line_pos and self.text[self.pos+self.line_pos] in separators:
            self.key_right()
        while len(self.text) != self.pos+self.line_pos and self.text[self.pos+self.line_pos] not in separators:
            self.key_right()
        return True

    def delete_word(self):
        """
        Delete the word just before the cursor
        """
        if not len(self.text) or self.pos == 0:
            return
        separators = string.punctuation+' '
        while self.pos > 0 and self.text[self.pos+self.line_pos-1] in separators:
            self.key_backspace()
        while self.pos > 0 and self.text[self.pos+self.line_pos-1] not in separators:
            self.key_backspace()

        return True

    def delete_end_of_line(self):
        """
        Cut the text from cursor to the end of line
        """
        if len(self.text) == self.pos+self.line_pos:
            return              # nothing to cut
        Input.clipboard = self.text[self.pos+self.line_pos:]
        self.text = self.text[:self.pos+self.line_pos]
        self.key_end()
        return True

    def delete_begining_of_line(self):
        """
        Cut the text from cursor to the begining of line
        """
        if self.pos+self.line_pos == 0:
            return
        Input.clipboard = self.text[:self.pos+self.line_pos]
        self.text = self.text[self.pos+self.line_pos:]
        self.key_home()
        return True

    def paste_clipboard(self):
        """
        Insert what is in the clipboard at the cursor position
        """
        if not Input.clipboard or len(Input.clipboard) == 0:
            return
        for letter in Input.clipboard:
            self.do_command(letter, False)
        self.rewrite_text()
        return True

    def key_dc(self):
        """
        delete char just after the cursor
        """
        self.reset_completion()
        if self.pos + self.line_pos == len(self.text):
            return              # end of line, nothing to delete
        if self.text[self.pos+self.line_pos] == '\x19':
            self.text = self.text[:self.pos+self.line_pos]+self.text[self.pos+self.line_pos+1:]
        self.text = self.text[:self.pos+self.line_pos]+self.text[self.pos+self.line_pos+1:]
        self.rewrite_text()
        return True

    def key_home(self):
        """
        Go to the begining of line
        """
        self.reset_completion()
        self.pos = 0
        self.line_pos = 0
        self.rewrite_text()
        return True

    def key_end(self, reset=False):
        """
        Go to the end of line
        """
        if reset:
            self.reset_completion()
        if len(self.text) >= self.width-1:
            self.pos = self.width-1
            self.line_pos = len(self.text)-self.pos
        else:
            self.pos = len(self.text)
            self.line_pos = 0
        self.rewrite_text()
        return True

    def key_left(self, jump=True, reset=True):
        """
        Move the cursor one char to the left
        """
        if reset:
            self.reset_completion()
        if self.pos == self.width-1 and self.line_pos > 0:
            self.line_pos -= 1
        elif self.pos >= 1:
            self.pos -= 1
        if jump and self.pos+self.line_pos >= 1 and self.text[self.pos+self.line_pos-1] == '\x19':
            self.key_left()
        elif reset:
            self.rewrite_text()
        return True

    def key_right(self, jump=True, reset=True):
        """
        Move the cursor one char to the right
        """
        if reset:
            self.reset_completion()
        if self.pos == self.width-1:
            if self.line_pos + self.width-1 < len(self.text):
                self.line_pos += 1
        elif self.pos < len(self.text):
            self.pos += 1
        if jump and self.pos+self.line_pos < len(self.text) and self.text[self.pos+self.line_pos-1] == '\x19':
            self.key_right()
        elif reset:
            self.rewrite_text()
        return True

    def key_backspace(self, reset=True):
        """
        Delete the char just before the cursor
        """
        self.reset_completion()
        if self.pos == 0:
            return
        self.text = self.text[:self.pos+self.line_pos-1]+self.text[self.pos+self.line_pos:]
        self.key_left(False)
        if self.pos+self.line_pos >= 1 and self.text[self.pos+self.line_pos-1] == '\x19':
            self.text = self.text[:self.pos+self.line_pos-1]+self.text[self.pos+self.line_pos:]
        if reset:
            self.rewrite_text()
        return True

    def auto_completion(self, word_list, add_after):
        """
        Complete the input, from a list of words
        if add_after is None, we use the value defined in completion
        plus a space, after the completion. If it's a string, we use it after the
        completion (with no additional space)
        """
        completion_type = config.get('completion', 'normal')
        if completion_type == 'shell' and self.text != '':
            self.shell_completion(word_list, add_after)
        else:
            self.normal_completion(word_list, add_after)
        return True

    def reset_completion(self):
        """
        Reset the completion list (called on ALL keys except tab)
        """
        self.hit_list = []
        self.last_completion = None

    def normal_completion(self, word_list, after):
        """
        Normal completion
        """
        (y, x) = self._win.getyx()
        pos = self.pos + self.line_pos
        if pos < len(self.text) and after.endswith(' ') and self.text[pos] == ' ':
            after = after[:-1]  # remove the last space if we are already on a space
        if not self.last_completion:
            space_before_cursor = self.text.rfind(' ', 0, pos)
            if space_before_cursor != -1:
                begin = self.text[space_before_cursor+1:pos]
            else:
                begin = self.text[:pos]
            hit_list = []       # list of matching nicks
            for word in word_list:
                if word.lower().startswith(begin.lower()):
                    hit_list.append(word)
            if len(hit_list) == 0:
                return
            self.hit_list = hit_list
            end = len(begin)
        else:
            begin = self.last_completion
            end = len(begin) + len(after)
            self.hit_list.append(self.hit_list.pop(0)) # rotate list

        self.text = self.text[:pos-end] + self.text[pos:]
        pos -= end
        nick = self.hit_list[0] # take the first hit
        self.text = self.text[:pos] + nick + after + self.text[pos:]
        for i in range(end):
            try:
                self.key_left(reset=False)
            except:
                pass
        for i in range(len(nick + after)):
            self.key_right(reset=False)

        self.rewrite_text()
        self.last_completion = nick

    def shell_completion(self, word_list, after):
        """
        Shell-like completion
        """
        (y, x) = self._win.getyx()
        if self.text != '':
            begin = self.text.split()[-1].lower()
        else:
            begin = ''
        hit_list = []       # list of matching nicks
        for user in word_list:
            if user.lower().startswith(begin):
                hit_list.append(user)
        if len(hit_list) == 0:
            return
        end = False
        nick = ''
        last_completion = self.last_completion
        self.last_completion = True
        if len(hit_list) == 1:
            nick = hit_list[0] + after
            self.last_completion = False
        elif last_completion:
            for n in hit_list:
                if begin.lower() == n.lower():
                    nick = n+after # user DO want this completion (tabbed twice on it)
                    self.last_completion = False
        if nick == '':
            while not end and len(nick) < len(hit_list[0]):
                nick = hit_list[0][:len(nick)+1]
                for hit in hit_list:
                    if not hit.lower().startswith(nick.lower()):
                        end = True
                        break
            if end:
                nick = nick[:-1]
        x -= len(begin)
        self.text = self.text[:-len(begin)]
        self.text += nick
        self.key_end(False)

    def do_command(self, key, reset=True):
        if key in self.key_func:
            res = self.key_func[key]()
            if self.on_input:
                self.on_input(self.get_text())
            return res
        if not key or len(key) > 1:
            return False   # ignore non-handled keyboard shortcuts
        if reset:
            self.reset_completion()
        self.text = self.text[:self.pos+self.line_pos]+key+self.text[self.pos+self.line_pos:]
        (y, x) = self._win.getyx()
        if x == self.width-1:
            self.line_pos += 1 # wcwidth.wcswidth(key)
        else:
            self.pos += 1 # wcwidth.wcswidth(key)
        if reset:
            self.rewrite_text()
        if self.on_input:
            self.on_input(self.get_text())
        return True

    def add_line_break(self):
        """
        Add a (real) \n to the line
        """
        self.do_command('\n')

    def get_text(self):
        """
        Clear the input and return the text entered so far
        """
        return self.text

    def rewrite_text(self):
        """
        Refresh the line onscreen, from the pos and pos_line
        """
        with g_lock:
            text = self.text.replace('\n', '|')
            self._win.erase()
            if self.color:
                self._win.attron(to_curses_attr(self.color))
            displayed_text = text[self.line_pos:self.line_pos+self.width-1]
            self.addstr(displayed_text)
            if self.color:
                (y, x) = self._win.getyx()
                size = self.width-x
                self.addnstr(' '*size, size, to_curses_attr(self.color))
            self.addstr(0, wcwidth.wcswidth(displayed_text[:self.pos]), '')
            if self.color:
                self._win.attroff(to_curses_attr(self.color))
            self._refresh()

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        self.rewrite_text()

    def clear_text(self):
        self.text = ''
        self.pos = 0
        self.line_pos = 0
        self.rewrite_text()

    def key_enter(self):
        txt = self.get_text()
        self.clear_text()
        return txt

class MessageInput(Input):
    """
    The input featuring history and that is being used in
    Conversation, Muc and Private tabs
    Also letting the user enter colors or other text markups
    """
    history = list()            # The history is common to all MessageInput
    text_attributes = set(('b', 'o', 'u'))

    def __init__(self):
        Input.__init__(self)
        self.last_completion = None
        self.histo_pos = -1
        self.key_func["KEY_UP"] = self.key_up
        self.key_func["M-A"] =  self.key_up
        self.key_func["KEY_DOWN"] = self.key_down
        self.key_func["M-B"] = self.key_down
        self.key_func['^C'] = self.enter_attrib

    def key_up(self):
        """
        Get the previous line in the history
        """
        self.reset_completion()
        if self.histo_pos == -1 and self.get_text():
            if not MessageInput.history or MessageInput.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                MessageInput.history.insert(0, self.get_text())
                self.histo_pos += 1
        if self.histo_pos < len(MessageInput.history) - 1:
            self.histo_pos += 1
            self.text = MessageInput.history[self.histo_pos]
        self.key_end()

    def enter_attrib(self):
        """
        Read one more char (c) and add \x19c to the string
        """
        attr_char = self.core.read_keyboard()[0]
        if attr_char in self.text_attributes or attr_char in allowed_color_digits:
            self.do_command('\x19', False)
            self.do_command(attr_char)

    def key_down(self):
        """
        Get the next line in the history
        """
        self.reset_completion()
        if self.histo_pos > 0:
            self.histo_pos -= 1
            self.text = MessageInput.history[self.histo_pos]
        elif self.histo_pos <= 0 and self.get_text():
            if not MessageInput.history or MessageInput.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                MessageInput.history.insert(0, self.get_text())
            self.text = ''
            self.histo_pos = -1
        self.key_end()

    def key_enter(self):
        txt = self.get_text()
        if len(txt) != 0:
            if not MessageInput.history or MessageInput.history[0] != txt:
                # add the message to history, but avoid duplicates
                MessageInput.history.insert(0, txt)
            self.histo_pos = -1
        self.clear_text()
        return txt

    def rewrite_text(self):
        """
        Refresh the line onscreen, from the pos and pos_line, with colors
        """
        with g_lock:
            text = self.text.replace('\n', '|')
            self._win.erase()
            if self.color:
                self._win.attron(to_curses_attr(self.color))
            displayed_text = text[self.line_pos:self.line_pos+self.width-1]
            self._win.attrset(0)
            self.addstr_colored_lite(displayed_text)
            self.addstr(0, wcwidth.wcswidth(displayed_text[:self.pos]), '')
            if self.color:
                self._win.attroff(to_curses_attr(self.color))
            self._refresh()

class CommandInput(Input):
    """
    An input with an help message in the left, with three given callbacks:
    one when when successfully 'execute' the command and when we abort it.
    The last callback is optional and is called on any input key
    This input is used, for example, in the RosterTab when, to replace the
    HelpMessage when a command is started
    The on_input callback
    """
    history = list()

    def __init__(self, help_message, on_abort, on_success, on_input=None):
        Input.__init__(self)
        self.on_abort = on_abort
        self.on_success = on_success
        self.on_input = on_input
        self.help_message = help_message
        self.key_func['^M'] = self.success
        self.key_func['^G'] = self.abort
        self.key_func['^C'] = self.abort
        self.key_func["KEY_UP"] = self.key_up
        self.key_func["M-A"] =  self.key_up
        self.key_func["KEY_DOWN"] = self.key_down
        self.key_func["M-B"] = self.key_down
        self.histo_pos = -1

    def do_command(self, key):
        res = Input.do_command(self, key)
        if self.on_input:
            self.on_input(self.get_text())
        return res

    def success(self):
        """
        call the success callback, passing the text as argument
        """
        self.on_input = None
        res = self.on_success(self.get_text())
        return  res

    def abort(self):
        """
        Call the abort callback, passing the text as argument
        """
        self.on_input = None
        return self.on_abort(self.get_text())

    def rewrite_text(self):
        """
        Rewrite the text just like a normal input, but with the instruction
        on the left
        """
        with g_lock:
            self._win.erase()
            self.addstr(self.help_message, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
            cursor_pos = self.pos + len(self.help_message)
            if len(self.help_message):
                self.addstr(' ')
                cursor_pos += 1
            self.addstr(self.text[self.line_pos:self.line_pos+self.width-1])
            self.addstr(0, cursor_pos, '') # WTF, this works but .move() doesn't…
            self._refresh()

    def on_delete(self):
        """
        SERIOUSLY BIG WTF.

        I can do
        self.key_func.clear()

        but not
        del self.key_func
        because that would raise an AttributeError exception. WTF.
        """
        self.on_abort = None
        self.on_success = None
        self.on_input = None
        self.key_func.clear()

    def key_up(self):
        """
        Get the previous line in the history
        """
        self.reset_completion()
        if self.histo_pos == -1 and self.get_text():
            if not self.history or self.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                self.history.insert(0, self.get_text())
                self.histo_pos += 1
        if self.histo_pos < len(self.history) - 1:
            self.histo_pos += 1
            self.text = self.history[self.histo_pos]
        self.key_end()

    def key_down(self):
        """
        Get the next line in the history
        """
        self.reset_completion()
        if self.histo_pos > 0:
            self.histo_pos -= 1
            self.text = self.history[self.histo_pos]
        elif self.histo_pos <= 0 and self.get_text():
            if not self.history or self.history[0] != self.get_text():
                # add the message to history, we do not want to lose it
                self.history.insert(0, self.get_text())
            self.text = ''
            self.histo_pos = -1
        self.key_end()

    def key_enter(self):
        txt = self.get_text()
        if len(txt) != 0:
            if not self.history or self.history[0] != txt:
                # add the message to history, but avoid duplicates
                self.history.insert(0, txt)
            self.histo_pos = -1


class VerticalSeparator(Win):
    """
    Just a one-column window, with just a line in it, that is
    refreshed only on resize, but never on refresh, for efficiency
    """
    def __init__(self):
        Win.__init__(self)

    def rewrite_line(self):
        with g_lock:
            self._win.vline(0, 0, curses.ACS_VLINE, self.height, to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
            self._refresh()

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        self.rewrite_line()

class RosterWin(Win):
    color_show = {'xa':get_theme().COLOR_STATUS_XA,
                  'none':get_theme().COLOR_STATUS_ONLINE,
                  '':get_theme().COLOR_STATUS_ONLINE,
                  'available':get_theme().COLOR_STATUS_ONLINE,
                  'dnd':get_theme().COLOR_STATUS_DND,
                  'away':get_theme().COLOR_STATUS_AWAY,
                  'chat':get_theme().COLOR_STATUS_CHAT,
                  'unavailable':get_theme().COLOR_STATUS_UNAVAILABLE
                  }

    def __init__(self):
        Win.__init__(self)
        self.pos = 0            # cursor position in the contact list
        self.start_pos = 1      # position of the start of the display
        self.roster_len = 0
        self.selected_row = None

    def move_cursor_down(self):
        """
        Return True if we scrolled, False otherwise
        """
        if self.pos < self.roster_len-1:
            self.pos += 1
        else:
            return False
        if self.pos == self.start_pos-1 + self.height-1:
            self.scroll_down()
        return True

    def move_cursor_up(self):
        """
        Return True if we scrolled, False otherwise
        """
        if self.pos > 0:
            self.pos -= 1
        else:
            return False
        if self.pos == self.start_pos-2:
            self.scroll_up()
        return True

    def scroll_down(self):
        self.start_pos += 8

    def scroll_up(self):
        self.start_pos -= 8

    def refresh(self, roster):
        """
        We get the roster object
        """
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self.roster_len = len(roster)
            while self.roster_len and self.pos >= self.roster_len:
                self.move_cursor_up()
            self._win.erase()
            self._win.move(0, 0)
            self.draw_roster_information(roster)
            y = 1
            show_offline = config.get('roster_show_offline', 'false') == 'true'
            for group in roster.get_groups():
                if not show_offline and group.get_nb_connected_contacts() == 0:
                    continue    # Ignore empty groups
                # This loop is really REALLY ugly :^)
                if y-1 == self.pos:
                    self.selected_row = group
                if y >= self.start_pos:
                    self.draw_group(y-self.start_pos+1, group, y-1==self.pos)
                y += 1
                if group.folded:
                    continue
                for contact in group.get_contacts(roster._contact_filter):
                    if not show_offline and contact.get_nb_resources() == 0:
                        continue
                    if y-1 == self.pos:
                        self.selected_row = contact
                    if y-self.start_pos+1 == self.height:
                        break
                    if y >= self.start_pos:
                        self.draw_contact_line(y-self.start_pos+1, contact, y-1==self.pos)
                    y += 1
                    if not contact._folded:
                        for resource in contact.get_resources():
                            if y-1 == self.pos:
                                self.selected_row = resource
                            if y-self.start_pos+1 == self.height:
                                break
                            if y >= self.start_pos:
                                self.draw_resource_line(y-self.start_pos+1, resource, y-1==self.pos)
                            y += 1
                if y-self.start_pos+1 == self.height:
                    break
            if self.start_pos > 1:
                self.draw_plus(1)
            if self.start_pos + self.height-2 < self.roster_len:
                self.draw_plus(self.height-1)
            self._refresh()

    def draw_plus(self, y):
        """
        Draw the indicator that shows that
        the list is longer than what is displayed
        """
        self.addstr(y, self.width-5, '++++', to_curses_attr(get_theme().COLOR_MORE_INDICATOR))

    def draw_roster_information(self, roster):
        """
        The header at the top
        """
        self.addstr('Roster: %s/%s contacts' % (roster.get_nb_connected_contacts(), roster.get_contact_len())\
                , to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)

    def draw_group(self, y, group, colored):
        """
        Draw a groupname on a line
        """
        if colored:
            self._win.attron(to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        if group.folded:
            self.addstr(y, 0, '[+] ')
        else:
            self.addstr(y, 0, '[-] ')
        contacts = " (%s/%s)" % (group.get_nb_connected_contacts(), len(group))
        self.addstr(y, 4, group.name + contacts)
        if colored:
            self._win.attroff(to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        self.finish_line()

    def draw_contact_line(self, y, contact, colored):
        """
        Draw on a line all informations about one contact.
        This is basically the highest priority resource's informations
        Use 'color' to draw the jid/display_name to show what is
        the currently selected contact in the list
        """
        resource = contact.get_highest_priority_resource()
        if not resource:
            # There's no online resource
            presence = 'unavailable'
            folder = '   '
            nb = ''
        else:
            presence = resource.get_presence()
            folder = '[+]' if contact._folded else '[-]'
            nb = ' (%s)' % (contact.get_nb_resources(),)
        color = RosterWin.color_show[presence]
        if contact.get_name():
            display_name = '%s (%s)%s' % (contact.get_name(),
                                        contact.get_bare_jid(), nb,)
        else:
            display_name = '%s%s' % (contact.get_bare_jid(), nb,)
        self.addstr(y, 0, ' ')
        self.addstr(" ", to_curses_attr(color))
        if resource:
            self.addstr(' [+]' if contact._folded else ' [-]')
        self.addstr(' ')
        if colored:
            self.addstr(display_name, to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        else:
            self.addstr(display_name)
        if contact.get_ask() == 'asked':
            self.addstr('?', to_curses_attr(get_theme().COLOR_HIGHLIGHT_NICK))
        self.finish_line()

    def draw_resource_line(self, y, resource, colored):
        """
        Draw a specific resource line
        """
        color = RosterWin.color_show[resource.get_presence()]
        self.addstr(y, 4, " ", to_curses_attr(color))
        if colored:
            self.addstr(y, 6, resource.get_jid().full, to_curses_attr(get_theme().COLOR_SELECTED_ROW))
        else:
            self.addstr(y, 6, resource.get_jid().full)
        self.finish_line()

    def get_selected_row(self):
        return self.selected_row

class ContactInfoWin(Win):
    def __init__(self):
        Win.__init__(self)

    def draw_contact_info(self, contact):
        """
        draw the contact information
        """
        if contact:
            jid = contact.get_bare_jid()
        else:
            jid = jid or resource.get_jid().full
        resource = contact.get_highest_priority_resource()
        if resource:
            presence = resource.get_presence()
        else:
            presence = 'unavailable'
        self.addstr(0, 0, '%s (%s)'%(jid, presence,), to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)
        self.addstr(1, 0, 'Subscription: %s' % (contact.get_subscription(),))
        if contact.get_ask():
            if contact.get_ask() == 'asked':
                self.addstr(' Ask: %s' % (contact.get_ask(),), to_curses_attr(get_theme().COLOR_HIGHLIGHT_NICK))
            else:
                self.addstr(' Ask: %s' % (contact.get_ask(),))
        self.finish_line()


    def draw_group_info(self, group):
        """
        draw the group information
        """
        self.addstr(0, 0, group.name, to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
        self.finish_line(get_theme().COLOR_INFORMATION_BAR)

    def refresh(self, selected_row):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            if isinstance(selected_row, RosterGroup):
                self.draw_group_info(selected_row)
            elif isinstance(selected_row, Contact):
                self.draw_contact_info(selected_row)
            # elif isinstance(selected_row, Resource):
            #     self.draw_contact_info(None, selected_row)
            self._refresh()

class ListWin(Win):
    """
    A list (with no depth, so not for the roster) that can be
    scrolled up and down, with one selected line at a time
    """
    def __init__(self, columns, with_headers=True):
        Win.__init__(self)
        self._columns = columns # a tuple with the name of the columns
        self._columns_sizes = {} # a dict {'column_name': size}
        self.sorted_by = (None, None) # for example: ('name', '↑')
        self.lines = []         # a list of dicts
        self._selected_row = 0
        self._starting_pos = 0  # The column number from which we start the refresh

    def empty(self):
        """
        emtpy the list and reset some important values as well
        """
        self.lines = []
        self._selected_row = 0
        self._starting_pos = 0

    def resize_columns(self, dic):
        """
        Resize the width of the columns
        """
        self._columns_sizes = dic

    def sort_by_column(self, col_name, asc=True):
        """
        Sort the list by the given column, ascendant or descendant
        """
        pass                    # TODO

    def add_lines(self, lines):
        """
        Append some lines at the end of the list
        """
        if not lines:
            return
        self.lines += lines
        self.refresh()
        curses.doupdate()

    def get_selected_row(self):
        """
        Return the tuple representing the selected row
        """
        if self._selected_row is not None and self.lines:
            return self.lines[self._selected_row]
        return None

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            lines = self.lines[self._starting_pos:self._starting_pos+self.height]
            for y, line in enumerate(lines):
                x = 0
                for col in self._columns:
                    try:
                        txt = line[col] or ''
                    except (KeyError):
                        txt = ''
                    size = self._columns_sizes[col]
                    txt += ' ' * (size-len(txt))
                    if not txt:
                        continue
                    if line is self.lines[self._selected_row]:
                        self.addstr(y, x, txt[:size], to_curses_attr(get_theme().COLOR_INFORMATION_BAR))
                    else:
                        self.addstr(y, x, txt[:size])
                    x += size
            self._refresh()

    def move_cursor_down(self):
        """
        Move the cursor Down
        """
        if not self.lines:
            return
        if self._selected_row < len(self.lines) - 1:
            self._selected_row += 1
        while self._selected_row >= self._starting_pos + self.height:
            self._starting_pos += self.height // 2
        if self._starting_pos < 0:
            self._starting_pos = 0
        return True

    def move_cursor_up(self):
        """
        Move the cursor Up
        """
        if not self.lines:
            return
        if self._selected_row > 0:
            self._selected_row -= 1
        while self._selected_row < self._starting_pos:
            self._starting_pos -= self.height // 2
        return True

    def scroll_down(self):
        if not self.lines:
            return
        self._selected_row += self.height
        if self._selected_row > len(self.lines) - 1:
            self._selected_row = len(self.lines) -1
        while self._selected_row >= self._starting_pos + self.height:
            self._starting_pos += self.height // 2
        if self._starting_pos < 0:
            self._starting_pos = 0
        return True

    def scroll_up(self):
        if not self.lines:
            return
        self._selected_row -= self.height + 1
        if self._selected_row < 0:
            self._selected_row = 0
        while self._selected_row < self._starting_pos:
            self._starting_pos -= self.height // 2
        return True

class ColumnHeaderWin(Win):
    """
    A class displaying the column's names
    """
    def __init__(self, columns):
        Win.__init__(self)
        self._columns = columns
        self._columns_sizes = {}

    def resize_columns(self, dic):
        self._columns_sizes = dic

    def get_columns(self):
        return self._columns

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            x = 0
            for col in self._columns:
                txt = col
                size = self._columns_sizes[col]
                txt += ' ' * (size-len(txt))
                self.addstr(0, x, txt, to_curses_attr(get_theme().COLOR_COLUMN_HEADER))
                x += size
            self._refresh()

class SimpleTextWin(Win):
    def __init__(self, text):
        Win.__init__(self)
        self._text = text
        self.built_lines = []

    def rebuild_text(self):
        """
        Transform the text in lines than can then be
        displayed without any calculation or anything
        at refresh() time
        It is basically called on each resize
        """
        self.built_lines = []
        for line in self._text.split('\n'):
            while len(line) >= self.width:
                limit = line[:self.width].rfind(' ')
                if limit <= 0:
                    limit = self.width
                self.built_lines.append(line[:limit])
                line = line[limit:]
            self.built_lines.append(line)

    def refresh(self):
        log.debug('Refresh: %s'%self.__class__.__name__)
        with g_lock:
            self._win.erase()
            for y, line in enumerate(self.built_lines):
                self.addstr_colored(line, y, 0)
            self._refresh()