# -*- coding:utf-8 -*-
## src/filetransfers_window.py
##
## Copyright (C) 2003-2010 Yann Leboulanger <asterix AT lagaule.org>
## Copyright (C) 2005-2006 Dimitur Kirov <dkirov AT gmail.com>
## Copyright (C) 2005-2007 Nikos Kouremenos <kourem AT gmail.com>
## Copyright (C) 2006 Travis Shirk <travis AT pobox.com>
##
## This file is part of Gajim.
##
## Gajim 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; version 3 only.
##
## Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
##

import gtk
import gobject
import pango
import os
import time

import gtkgui_helpers
import tooltips
import dialogs

from common import gajim
from common import helpers
from common.protocol.bytestream import (is_transfer_active, is_transfer_paused,
        is_transfer_stopped)

C_IMAGE = 0
C_LABELS = 1
C_FILE = 2
C_TIME = 3
C_PROGRESS = 4
C_PERCENT = 5
C_SID = 6


class FileTransfersWindow:
    def __init__(self):
        self.files_props = {'r' : {}, 's': {}}
        self.height_diff = 0
        self.xml = gtkgui_helpers.get_gtk_builder('filetransfers.ui')
        self.window = self.xml.get_object('file_transfers_window')
        self.tree = self.xml.get_object('transfers_list')
        self.cancel_button = self.xml.get_object('cancel_button')
        self.pause_button = self.xml.get_object('pause_restore_button')
        self.cleanup_button = self.xml.get_object('cleanup_button')
        self.notify_ft_checkbox = self.xml.get_object(
                'notify_ft_complete_checkbox')

        shall_notify = gajim.config.get('notify_on_file_complete')
        self.notify_ft_checkbox.set_active(shall_notify
                                                                                                )
        self.model = gtk.ListStore(gtk.gdk.Pixbuf, str, str, str, str, int, str)
        self.tree.set_model(self.model)
        col = gtk.TreeViewColumn()

        render_pixbuf = gtk.CellRendererPixbuf()

        col.pack_start(render_pixbuf, expand=True)
        render_pixbuf.set_property('xpad', 3)
        render_pixbuf.set_property('ypad', 3)
        render_pixbuf.set_property('yalign', .0)
        col.add_attribute(render_pixbuf, 'pixbuf', 0)
        self.tree.append_column(col)

        col = gtk.TreeViewColumn(_('File'))
        renderer = gtk.CellRendererText()
        col.pack_start(renderer, expand=False)
        col.add_attribute(renderer, 'markup', C_LABELS)
        renderer.set_property('yalign', 0.)
        renderer = gtk.CellRendererText()
        col.pack_start(renderer, expand=True)
        col.add_attribute(renderer, 'markup', C_FILE)
        renderer.set_property('xalign', 0.)
        renderer.set_property('yalign', 0.)
        renderer.set_property('ellipsize', pango.ELLIPSIZE_END)
        col.set_resizable(True)
        col.set_expand(True)
        self.tree.append_column(col)

        col = gtk.TreeViewColumn(_('Time'))
        renderer = gtk.CellRendererText()
        col.pack_start(renderer, expand=False)
        col.add_attribute(renderer, 'markup', C_TIME)
        renderer.set_property('yalign', 0.5)
        renderer.set_property('xalign', 0.5)
        renderer = gtk.CellRendererText()
        renderer.set_property('ellipsize', pango.ELLIPSIZE_END)
        col.set_resizable(True)
        col.set_expand(False)
        self.tree.append_column(col)

        col = gtk.TreeViewColumn(_('Progress'))
        renderer = gtk.CellRendererProgress()
        renderer.set_property('yalign', 0.5)
        renderer.set_property('xalign', 0.5)
        col.pack_start(renderer, expand=False)
        col.add_attribute(renderer, 'text', C_PROGRESS)
        col.add_attribute(renderer, 'value', C_PERCENT)
        col.set_resizable(True)
        col.set_expand(False)
        self.tree.append_column(col)

        self.images = {}
        self.icons = {
                'upload': gtk.STOCK_GO_UP,
                'download': gtk.STOCK_GO_DOWN,
                'stop': gtk.STOCK_STOP,
                'waiting': gtk.STOCK_REFRESH,
                'pause': gtk.STOCK_MEDIA_PAUSE,
                'continue': gtk.STOCK_MEDIA_PLAY,
                'ok': gtk.STOCK_APPLY,
        }

        self.tree.get_selection().set_mode(gtk.SELECTION_SINGLE)
        self.tree.get_selection().connect('changed', self.selection_changed)
        self.tooltip = tooltips.FileTransfersTooltip()
        self.file_transfers_menu = self.xml.get_object('file_transfers_menu')
        self.open_folder_menuitem = self.xml.get_object('open_folder_menuitem')
        self.cancel_menuitem = self.xml.get_object('cancel_menuitem')
        self.pause_menuitem = self.xml.get_object('pause_menuitem')
        self.continue_menuitem = self.xml.get_object('continue_menuitem')
        self.remove_menuitem = self.xml.get_object('remove_menuitem')
        self.xml.connect_signals(self)

    def find_transfer_by_jid(self, account, jid):
        """
        Find all transfers with peer 'jid' that belong to 'account'
        """
        active_transfers = [[], []] # ['senders', 'receivers']

        # 'account' is the sender
        for file_props in self.files_props['s'].values():
            if file_props['tt_account'] == account:
                receiver_jid = unicode(file_props['receiver']).split('/')[0]
                if jid == receiver_jid:
                    if not is_transfer_stopped(file_props):
                        active_transfers[0].append(file_props)

        # 'account' is the recipient
        for file_props in self.files_props['r'].values():
            if file_props['tt_account'] == account:
                sender_jid = unicode(file_props['sender']).split('/')[0]
                if jid == sender_jid:
                    if not is_transfer_stopped(file_props):
                        active_transfers[1].append(file_props)
        return active_transfers

    def show_completed(self, jid, file_props):
        """
        Show a dialog saying that file (file_props) has been transferred
        """
        def on_open(widget, file_props):
            dialog.destroy()
            if 'file-name' not in file_props:
                return
            path = os.path.split(file_props['file-name'])[0]
            if os.path.exists(path) and os.path.isdir(path):
                helpers.launch_file_manager(path)
            self.tree.get_selection().unselect_all()

        if file_props['type'] == 'r':
            # file path is used below in 'Save in'
            (file_path, file_name) = os.path.split(file_props['file-name'])
        else:
            file_name = file_props['name']
        sectext = '\t' + _('Filename: %s') % file_name
        sectext += '\n\t' + _('Size: %s') % \
        helpers.convert_bytes(file_props['size'])
        if file_props['type'] == 'r':
            jid = unicode(file_props['sender']).split('/')[0]
            sender_name = gajim.contacts.get_first_contact_from_jid(
                    file_props['tt_account'], jid).get_shown_name()
            sender = sender_name
        else:
            #You is a reply of who sent a file
            sender = _('You')
        sectext += '\n\t' + _('Sender: %s') % sender
        sectext += '\n\t' + _('Recipient: ')
        if file_props['type'] == 's':
            jid = unicode(file_props['receiver']).split('/')[0]
            receiver_name = gajim.contacts.get_first_contact_from_jid(
                    file_props['tt_account'], jid).get_shown_name()
            recipient = receiver_name
        else:
            #You is a reply of who received a file
            recipient = _('You')
        sectext += recipient
        if file_props['type'] == 'r':
            sectext += '\n\t' + _('Saved in: %s') % file_path
        dialog = dialogs.HigDialog(None, gtk.MESSAGE_INFO, gtk.BUTTONS_NONE,
                        _('File transfer completed'), sectext)
        if file_props['type'] == 'r':
            button = gtk.Button(_('_Open Containing Folder'))
            button.connect('clicked', on_open, file_props)
            dialog.action_area.pack_start(button)
        ok_button = dialog.add_button(gtk.STOCK_OK, gtk.RESPONSE_OK)
        def on_ok(widget):
            dialog.destroy()
        ok_button.connect('clicked', on_ok)
        dialog.show_all()

    def show_request_error(self, file_props):
        """
        Show error dialog to the recipient saying that transfer has been canceled
        """
        dialogs.InformationDialog(_('File transfer cancelled'), _('Connection with peer cannot be established.'))
        self.tree.get_selection().unselect_all()

    def show_send_error(self, file_props):
        """
        Show error dialog to the sender saying that transfer has been canceled
        """
        dialogs.InformationDialog(_('File transfer cancelled'),
                _('Connection with peer cannot be established.'))
        self.tree.get_selection().unselect_all()

    def show_stopped(self, jid, file_props, error_msg=''):
        if file_props['type'] == 'r':
            file_name = os.path.basename(file_props['file-name'])
        else:
            file_name = file_props['name']
        sectext = '\t' + _('Filename: %s') % file_name
        sectext += '\n\t' + _('Recipient: %s') % jid
        if error_msg:
            sectext += '\n\t' + _('Error message: %s') % error_msg
        dialogs.ErrorDialog(_('File transfer stopped'), sectext)
        self.tree.get_selection().unselect_all()

    def show_file_send_request(self, account, contact):
        desc_entry = gtk.Entry()

        def on_ok(widget):
            file_dir = None
            files_path_list = dialog.get_filenames()
            files_path_list = gtkgui_helpers.decode_filechooser_file_paths(
                    files_path_list)
            desc = desc_entry.get_text()
            for file_path in files_path_list:
                if self.send_file(account, contact, file_path, desc) and file_dir is None:
                    file_dir = os.path.dirname(file_path)
            if file_dir:
                gajim.config.set('last_send_dir', file_dir)
                dialog.destroy()

        dialog = dialogs.FileChooserDialog(_('Choose File to Send...'),
                gtk.FILE_CHOOSER_ACTION_OPEN, (gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL),
                gtk.RESPONSE_OK,
                True, # select multiple true as we can select many files to send
                gajim.config.get('last_send_dir'),
                on_response_ok=on_ok,
                on_response_cancel=lambda e:dialog.destroy()
                )

        btn = gtk.Button(_('_Send'))
        btn.set_property('can-default', True)
        # FIXME: add send icon to this button (JUMP_TO)
        dialog.add_action_widget(btn, gtk.RESPONSE_OK)
        dialog.set_default_response(gtk.RESPONSE_OK)

        desc_hbox = gtk.HBox(False, 5)
        desc_hbox.pack_start(gtk.Label(_('Description: ')), False, False, 0)
        desc_hbox.pack_start(desc_entry, True, True, 0)

        dialog.vbox.pack_start(desc_hbox, False, False, 0)

        btn.show()
        desc_hbox.show_all()

    def send_file(self, account, contact, file_path, file_desc=''):
        """
        Start the real transfer(upload) of the file
        """
        if gtkgui_helpers.file_is_locked(file_path):
            pritext = _('Gajim cannot access this file')
            sextext = _('This file is being used by another process.')
            dialogs.ErrorDialog(pritext, sextext)
            return

        if isinstance(contact, str):
            if contact.find('/') == -1:
                return
            (jid, resource) = contact.split('/', 1)
            contact = gajim.contacts.create_contact(jid=jid, account=account, resource=resource)
        file_name = os.path.split(file_path)[1]
        file_props = self.get_send_file_props(account, contact,
                        file_path, file_name, file_desc)
        if file_props is None:
            return False
        self.add_transfer(account, contact, file_props)
        gajim.connections[account].send_file_request(file_props)
        return True

    def _start_receive(self, file_path, account, contact, file_props):
        file_dir = os.path.dirname(file_path)
        if file_dir:
            gajim.config.set('last_save_dir', file_dir)
        file_props['file-name'] = file_path
        self.add_transfer(account, contact, file_props)
        gajim.connections[account].send_file_approval(file_props)

    def show_file_request(self, account, contact, file_props):
        """
        Show dialog asking for comfirmation and store location of new file
        requested by a contact
        """
        if file_props is None or 'name' not in file_props:
            return
        sec_text = '\t' + _('File: %s') % gobject.markup_escape_text(
                file_props['name'])
        if 'size' in file_props:
            sec_text += '\n\t' + _('Size: %s') % \
                    helpers.convert_bytes(file_props['size'])
        if 'mime-type' in file_props:
            sec_text += '\n\t' + _('Type: %s') % file_props['mime-type']
        if 'desc' in file_props:
            sec_text += '\n\t' + _('Description: %s') % file_props['desc']
        prim_text = _('%s wants to send you a file:') % contact.jid
        dialog = None

        def on_response_ok(account, contact, file_props):

            def on_ok(widget, account, contact, file_props):
                file_path = dialog2.get_filename()
                file_path = gtkgui_helpers.decode_filechooser_file_paths(
                        (file_path,))[0]
                if os.path.exists(file_path):
                    # check if we have write permissions
                    if not os.access(file_path, os.W_OK):
                        file_name = os.path.basename(file_path)
                        dialogs.ErrorDialog(_('Cannot overwrite existing file "%s"' % file_name),
                        _('A file with this name already exists and you do not have permission to overwrite it.'))
                        return
                    stat = os.stat(file_path)
                    dl_size = stat.st_size
                    file_size = file_props['size']
                    dl_finished = dl_size >= file_size

                    def on_response(response):
                        if response < 0:
                            return
                        elif response == 100:
                            file_props['offset'] = dl_size
                        dialog2.destroy()
                        self._start_receive(file_path, account, contact, file_props)

                    dialog = dialogs.FTOverwriteConfirmationDialog(
                            _('This file already exists'), _('What do you want to do?'),
                            propose_resume=not dl_finished, on_response=on_response)
                    dialog.set_transient_for(dialog2)
                    dialog.set_destroy_with_parent(True)
                    return
                else:
                    dirname = os.path.dirname(file_path)
                    if not os.access(dirname, os.W_OK) and os.name != 'nt':
                        # read-only bit is used to mark special folder under windows,
                        # not to mark that a folder is read-only. See ticket #3587
                        dialogs.ErrorDialog(_('Directory "%s" is not writable') % dirname, _('You do not have permission to create files in this directory.'))
                        return
                dialog2.destroy()
                self._start_receive(file_path, account, contact, file_props)

            def on_cancel(widget, account, contact, file_props):
                dialog2.destroy()
                gajim.connections[account].send_file_rejection(file_props)

            dialog2 = dialogs.FileChooserDialog(
                    title_text=_('Save File as...'),
                    action=gtk.FILE_CHOOSER_ACTION_SAVE,
                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
                    gtk.STOCK_SAVE, gtk.RESPONSE_OK),
                    default_response=gtk.RESPONSE_OK,
                    current_folder=gajim.config.get('last_save_dir'),
                    on_response_ok=(on_ok, account, contact, file_props),
                    on_response_cancel=(on_cancel, account, contact, file_props))

            dialog2.set_current_name(file_props['name'])
            dialog2.connect('delete-event', lambda widget, event:
                    on_cancel(widget, account, contact, file_props))

        def on_response_cancel(account, file_props):
            gajim.connections[account].send_file_rejection(file_props)

        dialog = dialogs.NonModalConfirmationDialog(prim_text, sec_text,
                on_response_ok=(on_response_ok, account, contact, file_props),
                on_response_cancel=(on_response_cancel, account, file_props))
        dialog.connect('delete-event', lambda widget, event:
            on_response_cancel(account, file_props))
        dialog.popup()

    def get_icon(self, ident):
        return self.images.setdefault(ident,
                self.window.render_icon(self.icons[ident], gtk.ICON_SIZE_MENU))

    def set_status(self, typ, sid, status):
        """
        Change the status of a transfer to state 'status'
        """
        iter_ = self.get_iter_by_sid(typ, sid)
        if iter_ is None:
            return
        sid = self.model[iter_][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        if status == 'stop':
            file_props['stopped'] = True
        elif status == 'ok':
            file_props['completed'] = True
        self.model.set(iter_, C_IMAGE, self.get_icon(status))
        path = self.model.get_path(iter_)
        self.select_func(path)

    def _format_percent(self, percent):
        """
        Add extra spaces from both sides of the percent, so that progress string
        has always a fixed size
        """
        _str = '          '
        if percent != 100.:
            _str += ' '
        if percent < 10:
            _str += ' '
        _str += unicode(percent) + '%          \n'
        return _str

    def _format_time(self, _time):
        times = { 'hours': 0, 'minutes': 0, 'seconds': 0 }
        _time = int(_time)
        times['seconds'] = _time % 60
        if _time >= 60:
            _time /= 60
            times['minutes'] = _time % 60
            if _time >= 60:
                times['hours'] = _time / 60

        #Print remaining time in format 00:00:00
        #You can change the places of (hours), (minutes), (seconds) -
        #they are not translatable.
        return _('%(hours)02.d:%(minutes)02.d:%(seconds)02.d') % times

    def _get_eta_and_speed(self, full_size, transfered_size, file_props):
        if len(file_props['transfered_size']) == 0:
            return 0., 0.
        elif len(file_props['transfered_size']) == 1:
            speed = round(float(transfered_size) / file_props['elapsed-time'])
        else:
            # first and last are (time, transfered_size)
            first = file_props['transfered_size'][0]
            last = file_props['transfered_size'][-1]
            transfered = last[1] - first[1]
            tim = last[0] - first[0]
            if tim == 0:
                return 0., 0.
            speed = round(float(transfered) / tim)
        if speed == 0.:
            return 0., 0.
        remaining_size = full_size - transfered_size
        eta = remaining_size / speed
        return eta, speed

    def _remove_transfer(self, iter_, sid, file_props):
        self.model.remove(iter_)
        if  'tt_account' in file_props:
            # file transfer is set
            account = file_props['tt_account']
            if account in gajim.connections:
                # there is a connection to the account
                gajim.connections[account].remove_transfer(file_props)
            if file_props['type'] == 'r': # we receive a file
                other = file_props['sender']
            else: # we send a file
                other = file_props['receiver']
            if isinstance(other, unicode):
                jid = gajim.get_jid_without_resource(other)
            else: # It's a Contact instance
                jid = other.jid
            for ev_type in ('file-error', 'file-completed', 'file-request-error',
            'file-send-error', 'file-stopped'):
                for event in gajim.events.get_events(account, jid, [ev_type]):
                    if event.parameters['sid'] == file_props['sid']:
                        gajim.events.remove_events(account, jid, event)
                        gajim.interface.roster.draw_contact(jid, account)
                        gajim.interface.roster.show_title()
        del(self.files_props[sid[0]][sid[1:]])
        del(file_props)

    def set_progress(self, typ, sid, transfered_size, iter_=None):
        """
        Change the progress of a transfer with new transfered size
        """
        if sid not in self.files_props[typ]:
            return
        file_props = self.files_props[typ][sid]
        full_size = int(file_props['size'])
        if full_size == 0:
            percent = 0
        else:
            percent = round(float(transfered_size) / full_size * 100, 1)
        if iter_ is None:
            iter_ = self.get_iter_by_sid(typ, sid)
        if iter_ is not None:
            just_began = False
            if self.model[iter_][C_PERCENT] == 0 and int(percent > 0):
                just_began = True
            text = self._format_percent(percent)
            if transfered_size == 0:
                text += '0'
            else:
                text += helpers.convert_bytes(transfered_size)
            text += '/' + helpers.convert_bytes(full_size)
            # Kb/s

            # remaining time
            if 'offset' in file_props and file_props['offset']:
                transfered_size -= file_props['offset']
                full_size -= file_props['offset']

            if file_props['elapsed-time'] > 0:
                file_props['transfered_size'].append((file_props['last-time'], transfered_size))
            if len(file_props['transfered_size']) > 6:
                file_props['transfered_size'].pop(0)
            eta, speed = self._get_eta_and_speed(full_size, transfered_size,
                    file_props)

            self.model.set(iter_, C_PROGRESS, text)
            self.model.set(iter_, C_PERCENT, int(percent))
            text = self._format_time(eta)
            text += '\n'
            #This should make the string Kb/s,
            #where 'Kb' part is taken from %s.
            #Only the 's' after / (which means second) should be translated.
            text += _('(%(filesize_unit)s/s)') % {'filesize_unit':
                    helpers.convert_bytes(speed)}
            self.model.set(iter_, C_TIME, text)

            # try to guess what should be the status image
            if file_props['type'] == 'r':
                status = 'download'
            else:
                status = 'upload'
            if 'paused' in file_props and file_props['paused'] == True:
                status = 'pause'
            elif 'stalled' in file_props and file_props['stalled'] == True:
                status = 'waiting'
            if 'connected' in file_props and file_props['connected'] == False:
                status = 'stop'
            self.model.set(iter_, 0, self.get_icon(status))
            if transfered_size == full_size:
                self.set_status(typ, sid, 'ok')
            elif just_began:
                path = self.model.get_path(iter_)
                self.select_func(path)

    def get_iter_by_sid(self, typ, sid):
        """
        Return iter to the row, which holds file transfer, identified by the
        session id
        """
        iter_ = self.model.get_iter_root()
        while iter_:
            if typ + sid == self.model[iter_][C_SID].decode('utf-8'):
                return iter_
            iter_ = self.model.iter_next(iter_)

    def get_send_file_props(self, account, contact, file_path, file_name,
                    file_desc=''):
        """
        Create new file_props dict and set initial file transfer properties in it
        """
        file_props = {'file-name' : file_path, 'name' : file_name,
                'type' : 's', 'desc' : file_desc}
        if os.path.isfile(file_path):
            stat = os.stat(file_path)
        else:
            dialogs.ErrorDialog(_('Invalid File'), _('File: ') + file_path)
            return None
        if stat[6] == 0:
            dialogs.ErrorDialog(_('Invalid File'),
            _('It is not possible to send empty files'))
            return None
        file_props['elapsed-time'] = 0
        file_props['size'] = unicode(stat[6])
        file_props['sid'] = helpers.get_random_string_16()
        file_props['completed'] = False
        file_props['started'] = False
        file_props['sender'] = account
        file_props['receiver'] = contact
        file_props['tt_account'] = account
        # keep the last time: transfered_size to compute transfer speed
        file_props['transfered_size'] = []
        return file_props

    def add_transfer(self, account, contact, file_props):
        """
        Add new transfer to FT window and show the FT window
        """
        self.on_transfers_list_leave_notify_event(None)
        if file_props is None:
            return
        file_props['elapsed-time'] = 0
        self.files_props[file_props['type']][file_props['sid']] = file_props
        iter_ = self.model.prepend()
        text_labels = '<b>' + _('Name: ') + '</b>\n'
        if file_props['type'] == 'r':
            text_labels += '<b>' + _('Sender: ') + '</b>'
        else:
            text_labels += '<b>' + _('Recipient: ') + '</b>'

        if file_props['type'] == 'r':
            file_name = os.path.split(file_props['file-name'])[1]
        else:
            file_name = file_props['name']
        text_props = gobject.markup_escape_text(file_name) + '\n'
        text_props += contact.get_shown_name()
        self.model.set(iter_, 1, text_labels, 2, text_props, C_SID,
                file_props['type'] + file_props['sid'])
        self.set_progress(file_props['type'], file_props['sid'], 0, iter_)
        if 'started' in file_props and file_props['started'] is False:
            status = 'waiting'
        elif file_props['type'] == 'r':
            status = 'download'
        else:
            status = 'upload'
        file_props['tt_account'] = account
        self.set_status(file_props['type'], file_props['sid'], status)
        self.set_cleanup_sensitivity()
        self.window.show_all()

    def on_transfers_list_motion_notify_event(self, widget, event):
        pointer = self.tree.get_pointer()
        props = widget.get_path_at_pos(int(event.x), int(event.y))
        self.height_diff = pointer[1] - int(event.y)
        if self.tooltip.timeout > 0:
            if not props or self.tooltip.id != props[0]:
                self.tooltip.hide_tooltip()
        if props:
            row = props[0]
            iter_ = None
            try:
                iter_ = self.model.get_iter(row)
            except Exception:
                self.tooltip.hide_tooltip()
                return
            sid = self.model[iter_][C_SID].decode('utf-8')
            file_props = self.files_props[sid[0]][sid[1:]]
            if file_props is not None:
                if self.tooltip.timeout == 0 or self.tooltip.id != props[0]:
                    self.tooltip.id = row
                    self.tooltip.timeout = gobject.timeout_add(500,
                            self.show_tooltip, widget)

    def on_transfers_list_leave_notify_event(self, widget=None, event=None):
        if event is not None:
            self.height_diff = int(event.y)
        elif self.height_diff is 0:
            return
        pointer = self.tree.get_pointer()
        props = self.tree.get_path_at_pos(pointer[0], pointer[1] - self.height_diff)
        if self.tooltip.timeout > 0:
            if not props or self.tooltip.id == props[0]:
                self.tooltip.hide_tooltip()

    def on_transfers_list_row_activated(self, widget, path, col):
        # try to open the containing folder
        self.on_open_folder_menuitem_activate(widget)

    def set_cleanup_sensitivity(self):
        """
        Check if there are transfer rows and set cleanup_button sensitive, or
        insensitive if model is empty
        """
        if len(self.model) == 0:
            self.cleanup_button.set_sensitive(False)
        else:
            self.cleanup_button.set_sensitive(True)

    def set_all_insensitive(self):
        """
        Make all buttons/menuitems insensitive
        """
        self.pause_button.set_sensitive(False)
        self.pause_menuitem.set_sensitive(False)
        self.continue_menuitem.set_sensitive(False)
        self.remove_menuitem.set_sensitive(False)
        self.cancel_button.set_sensitive(False)
        self.cancel_menuitem.set_sensitive(False)
        self.open_folder_menuitem.set_sensitive(False)
        self.set_cleanup_sensitivity()

    def set_buttons_sensitive(self, path, is_row_selected):
        """
        Make buttons/menuitems sensitive as appropriate to the state of file
        transfer located at path 'path'
        """
        if path is None:
            self.set_all_insensitive()
            return
        current_iter = self.model.get_iter(path)
        sid = self.model[current_iter][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        self.remove_menuitem.set_sensitive(is_row_selected)
        self.open_folder_menuitem.set_sensitive(is_row_selected)
        is_stopped = False
        if is_transfer_stopped(file_props):
            is_stopped = True
        self.cancel_button.set_sensitive(not is_stopped)
        self.cancel_menuitem.set_sensitive(not is_stopped)
        if not is_row_selected:
            # no selection, disable the buttons
            self.set_all_insensitive()
        elif not is_stopped:
            if is_transfer_active(file_props):
                # file transfer is active
                self.toggle_pause_continue(True)
                self.pause_button.set_sensitive(True)
            elif is_transfer_paused(file_props):
                # file transfer is paused
                self.toggle_pause_continue(False)
                self.pause_button.set_sensitive(True)
            else:
                self.pause_button.set_sensitive(False)
                self.pause_menuitem.set_sensitive(False)
                self.continue_menuitem.set_sensitive(False)
        else:
            self.pause_button.set_sensitive(False)
            self.pause_menuitem.set_sensitive(False)
            self.continue_menuitem.set_sensitive(False)
        return True

    def selection_changed(self, args):
        """
        Selection has changed - change the sensitivity of the buttons/menuitems
        """
        selection = args
        selected = selection.get_selected_rows()
        if selected[1] != []:
            selected_path = selected[1][0]
            self.select_func(selected_path)
        else:
            self.set_all_insensitive()

    def select_func(self, path):
        is_selected = False
        selected = self.tree.get_selection().get_selected_rows()
        if selected[1] != []:
            selected_path = selected[1][0]
            if selected_path == path:
                is_selected = True
        self.set_buttons_sensitive(path, is_selected)
        self.set_cleanup_sensitivity()
        return True

    def on_cleanup_button_clicked(self, widget):
        i = len(self.model) - 1
        while i >= 0:
            iter_ = self.model.get_iter((i))
            sid = self.model[iter_][C_SID].decode('utf-8')
            file_props = self.files_props[sid[0]][sid[1:]]
            if is_transfer_stopped(file_props):
                self._remove_transfer(iter_, sid, file_props)
            i -= 1
        self.tree.get_selection().unselect_all()
        self.set_all_insensitive()

    def toggle_pause_continue(self, status):
        if status:
            label = _('Pause')
            self.pause_button.set_label(label)
            self.pause_button.set_image(gtk.image_new_from_stock(
                    gtk.STOCK_MEDIA_PAUSE, gtk.ICON_SIZE_MENU))

            self.pause_menuitem.set_sensitive(True)
            self.pause_menuitem.set_no_show_all(False)
            self.continue_menuitem.hide()
            self.continue_menuitem.set_no_show_all(True)

        else:
            label = _('_Continue')
            self.pause_button.set_label(label)
            self.pause_button.set_image(gtk.image_new_from_stock(
                    gtk.STOCK_MEDIA_PLAY, gtk.ICON_SIZE_MENU))
            self.pause_menuitem.hide()
            self.pause_menuitem.set_no_show_all(True)
            self.continue_menuitem.set_sensitive(True)
            self.continue_menuitem.set_no_show_all(False)

    def on_pause_restore_button_clicked(self, widget):
        selected = self.tree.get_selection().get_selected()
        if selected is None or selected[1] is None:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        if self.is_transfer_paused(file_props):
            file_props['last-time'] = time.time()
            file_props['paused'] = False
            types = {'r' : 'download', 's' : 'upload'}
            self.set_status(file_props['type'], file_props['sid'], types[sid[0]])
            self.toggle_pause_continue(True)
            file_props['continue_cb']()
        elif is_transfer_active(file_props):
            file_props['paused'] = True
            self.set_status(file_props['type'], file_props['sid'], 'pause')
            # reset that to compute speed only when we resume
            file_props['transfered_size'] = []
            self.toggle_pause_continue(False)

    def on_cancel_button_clicked(self, widget):
        selected = self.tree.get_selection().get_selected()
        if selected is None or selected[1] is None:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        if 'tt_account' not in file_props:
            return
        account = file_props['tt_account']
        if account not in gajim.connections:
            return
        gajim.connections[account].disconnect_transfer(file_props)
        self.set_status(file_props['type'], file_props['sid'], 'stop')

    def show_tooltip(self, widget):
        if self.height_diff == 0:
            self.tooltip.hide_tooltip()
            return
        pointer = self.tree.get_pointer()
        props = self.tree.get_path_at_pos(pointer[0],
                pointer[1] - self.height_diff)
        # check if the current pointer is at the same path
        # as it was before setting the timeout
        if props and self.tooltip.id == props[0]:
            iter_ = self.model.get_iter(props[0])
            sid = self.model[iter_][C_SID].decode('utf-8')
            file_props = self.files_props[sid[0]][sid[1:]]
            # bounding rectangle of coordinates for the cell within the treeview
            rect = self.tree.get_cell_area(props[0], props[1])
            # position of the treeview on the screen
            position = widget.window.get_origin()
            self.tooltip.show_tooltip(file_props, rect.height,
                                                    position[1] + rect.y + self.height_diff)
        else:
            self.tooltip.hide_tooltip()

    def on_notify_ft_complete_checkbox_toggled(self, widget):
        gajim.config.set('notify_on_file_complete',
                widget.get_active())

    def on_file_transfers_dialog_delete_event(self, widget, event):
        self.on_transfers_list_leave_notify_event(widget, None)
        self.window.hide()
        return True # do NOT destory window

    def on_close_button_clicked(self, widget):
        self.window.hide()

    def show_context_menu(self, event, iter_):
        # change the sensitive propery of the buttons and menuitems
        if iter_:
            path = self.model.get_path(iter_)
            self.set_buttons_sensitive(path, True)

        event_button = gtkgui_helpers.get_possible_button_event(event)
        self.file_transfers_menu.show_all()
        self.file_transfers_menu.popup(None, self.tree, None,
                event_button, event.time)

    def on_transfers_list_key_press_event(self, widget, event):
        """
        When a key is pressed in the treeviews
        """
        self.tooltip.hide_tooltip()
        iter_ = None
        try:
            iter_ = self.tree.get_selection().get_selected()[1]
        except TypeError:
            self.tree.get_selection().unselect_all()

        if iter_ is not None:
            path = self.model.get_path(iter_)
            self.tree.get_selection().select_path(path)

        if event.keyval == gtk.keysyms.Menu:
            self.show_context_menu(event, iter_)
            return True


    def on_transfers_list_button_release_event(self, widget, event):
        # hide tooltip, no matter the button is pressed
        self.tooltip.hide_tooltip()
        path = None
        try:
            path = self.tree.get_path_at_pos(int(event.x), int(event.y))[0]
        except TypeError:
            self.tree.get_selection().unselect_all()
        if path is None:
            self.set_all_insensitive()
        else:
            self.select_func(path)

    def on_transfers_list_button_press_event(self, widget, event):
        # hide tooltip, no matter the button is pressed
        self.tooltip.hide_tooltip()
        path, iter_ = None, None
        try:
            path = self.tree.get_path_at_pos(int(event.x), int(event.y))[0]
        except TypeError:
            self.tree.get_selection().unselect_all()
        if event.button == 3: # Right click
            if path:
                self.tree.get_selection().select_path(path)
                iter_ = self.model.get_iter(path)
            self.show_context_menu(event, iter_)
            if path:
                return True

    def on_open_folder_menuitem_activate(self, widget):
        selected = self.tree.get_selection().get_selected()
        if not selected or not selected[1]:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        if 'file-name' not in file_props:
            return
        path = os.path.split(file_props['file-name'])[0]
        if os.path.exists(path) and os.path.isdir(path):
            helpers.launch_file_manager(path)

    def on_cancel_menuitem_activate(self, widget):
        self.on_cancel_button_clicked(widget)

    def on_continue_menuitem_activate(self, widget):
        self.on_pause_restore_button_clicked(widget)

    def on_pause_menuitem_activate(self, widget):
        self.on_pause_restore_button_clicked(widget)

    def on_remove_menuitem_activate(self, widget):
        selected = self.tree.get_selection().get_selected()
        if not selected or not selected[1]:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][C_SID].decode('utf-8')
        file_props = self.files_props[sid[0]][sid[1:]]
        self._remove_transfer(s_iter, sid, file_props)
        self.set_all_insensitive()

    def on_file_transfers_window_key_press_event(self, widget, event):
        if event.keyval == gtk.keysyms.Escape: # ESCAPE
            self.window.hide()
