def __init__(self, library):
        print_d("Creating Soundcloud Browser")
        super(SoundcloudBrowser, self).__init__(spacing=12)
        self.set_orientation(Gtk.Orientation.VERTICAL)

        if not self.instances():
            self._init(library)
        self._register_instance()

        self.connect('destroy', self.__destroy)
        self.connect('uri-received', self.__handle_incoming_uri)
        self.__auth_sig = self.api_client.connect('authenticated',
                                                  self.__on_authenticated)
        connect_destroy(self.library, 'changed', self.__changed)
        self.login_state = (State.LOGGED_IN if self.online
                            else State.LOGGED_OUT)
        self._create_searchbar(self.library)
        vbox = Gtk.VBox()
        vbox.pack_start(self._create_footer(), False, False, 6)
        vbox.pack_start(self._create_category_widget(), True, True, 0)
        vbox.pack_start(self.create_login_button(), False, False, 6)
        vbox.show()
        pane = qltk.ConfigRHPaned("browsers", "soundcloud_pos", 0.4)
        pane.show()
        pane.pack1(vbox, resize=False, shrink=False)
        self._songs_box = songs_box = Gtk.VBox(spacing=6)
        songs_box.pack_start(self._searchbox, False, True, 0)
        songs_box.show()
        pane.pack2(songs_box, resize=True, shrink=False)
        self.pack_start(pane, True, True, 0)
        self.show()

    def __init__(self, player, library):
        super(WaveformSeekBar, self).__init__()

        self._player = player
        self._rms_vals = []

        self._elapsed_label = TimeLabel()
        self._remaining_label = TimeLabel()
        self._waveform_scale = WaveformScale()

        self.pack_start(Align(self._elapsed_label, border=6), False, True, 0)
        self.pack_start(self._waveform_scale, True, True, 0)
        self.pack_start(Align(self._remaining_label, border=6), False, True, 0)

        for child in self.get_children():
            child.show_all()

        self._tracker = TimeTracker(player)
        self._tracker.connect('tick', self._on_tick, player)

        connect_destroy(player, 'seek', self._on_player_seek)
        connect_destroy(player, 'song-started', self._on_song_started)
        connect_destroy(player, 'song-ended', self._on_song_ended)
        connect_destroy(player, 'notify::seekable', self._on_seekable_changed)
        connect_destroy(library, 'changed', self._on_song_changed, player)

        self.connect('destroy', self._on_destroy)
        self._update(player)
        self._tracker.tick()

        if player.info:
            self._create_waveform(player.info, CONFIG.data_size)

    def enable_window_tracking(self, config_prefix, size_suffix=""):
        """Enable tracking/saving of changes and restore size/pos/maximized.

        Make sure to call set_transient_for() before since position is
        restored relative to the parent in this case.

        config_prefix -- prefix for the config key
                         (prefix_size, prefix_position, prefix_maximized)
        size_suffix -- optional suffix for saving the size. For cases where the
                       window has multiple states with different content sizes.
                       (example: edit tags with one song or multiple)

        """

        self.__state = 0
        self.__name = config_prefix
        self.__size_suffix = size_suffix
        self.__save_size_pos_deferred = DeferredSignal(
            self.__do_save_size_pos, timeout=50, owner=self)
        self.connect('configure-event', self.__configure_event)
        self.connect('window-state-event', self.__window_state_changed)
        self.connect('notify::visible', self.__visible_changed)
        parent = self.get_transient_for()
        if parent:
            connect_destroy(
                parent, 'configure-event', self.__parent_configure_event)
        self.__restore_window_state()

    def __init__(self, library, player, pattern_filename):
        super(SongInfo, self).__init__()
        self._pattern_filename = pattern_filename
        self.set_visible_window(False)
        align = Gtk.Alignment(xscale=0.0, xalign=0.0, yscale=0.0, yalign=0.0)
        label = Gtk.Label()
        label.set_ellipsize(Pango.EllipsizeMode.MIDDLE)
        label.set_selectable(True)
        align.add(label)
        label.set_alignment(0.0, 0.0)
        self._label = label
        connect_destroy(library, 'changed', self._on_library_changed, player)
        connect_destroy(player, 'song-started', self._on_song_started)

        label.connect('populate-popup', self._on_label_popup, player, library)
        self.connect('button-press-event', self._on_button_press_event,
                     player, library)

        try:
            with open(self._pattern_filename, "rb") as h:
                self._pattern = h.read().strip().decode("utf-8")
        except (EnvironmentError, UnicodeDecodeError):
            pass

        self._compiled = XMLFromMarkupPattern(self._pattern)
        align.show_all()
        self.add(align)

    def __init__(self, library, song, lyrics=True, bookmarks=True):
        super(OneSong, self).__init__()
        vbox = Gtk.VBox(spacing=12)
        vbox.set_border_width(12)
        self._title(song, vbox)
        self._album(song, vbox)
        self._people(song, vbox)
        self._library(song, vbox)
        self._file(song, vbox)
        self._additional(song, vbox)
        sw = SW()
        sw.title = _("Information")
        sw.add_with_viewport(vbox)
        self.append_page(sw)
        if lyrics:
            lyrics = LyricsPane(song)
            lyrics.title = _("Lyrics")
            self.append_page(lyrics)

        if bookmarks:
            bookmarks = EditBookmarksPane(None, song)
            bookmarks.title = _("Bookmarks")
            bookmarks.set_border_width(12)
            self.append_page(bookmarks)

        connect_destroy(library, 'changed', self.__check_changed, vbox, song)

    def enable_row_update(self, view, sw, column):
        connect_obj(view, "draw", self.__update_visibility, view)

        connect_destroy(sw.get_vadjustment(), "value-changed", self.__stop_update, view)

        self.__pending_paths = []
        self.__update_deferred = DeferredSignal(self.__update_visible_rows, timeout=50, priority=GLib.PRIORITY_LOW)
        self.__column = column
        self.__first_expose = True

    def __init__(self, parent, player, library):
        super(TopBar, self).__init__()

        # play controls
        control_item = Gtk.ToolItem()
        self.insert(control_item, 0)
        t = PlayControls(player, library.librarian)
        self.volume = t.volume

        # only restore the volume in case it is managed locally, otherwise
        # this could affect the system volume
        if not player.has_external_volume:
            player.volume = config.getfloat("memory", "volume")

        self.volume.connect("value-changed", self._on_volume_changed)
        control_item.add(t)

        self.insert(Gtk.SeparatorToolItem(), 1)

        info_item = Gtk.ToolItem()
        self.insert(info_item, 2)
        info_item.set_expand(True)

        box = Gtk.Box(spacing=6)
        info_item.add(box)
        qltk.add_css(self, "GtkToolbar {padding: 3px;}")

        # song text
        info_pattern_path = os.path.join(quodlibet.get_user_dir(), "songinfo")
        text = SongInfo(library.librarian, player, info_pattern_path)
        box.pack_start(Align(text, border=3), True, True, 0)

        # cover image
        self.image = CoverImage(resize=True)
        connect_destroy(player, 'song-started', self.__new_song)

        # FIXME: makes testing easier
        if app.cover_manager:
            connect_destroy(
                app.cover_manager, 'cover-changed',
                self.__song_art_changed, library)

        box.pack_start(Align(self.image, border=2), False, True, 0)

        # On older Gtk+ (3.4, at least)
        # setting a margin on CoverImage leads to errors and result in the
        # QL window not beeing visible for some reason.
        assert self.image.props.margin == 0

        for child in self.get_children():
            child.show_all()

        context = self.get_style_context()
        context.add_class("primary-toolbar")

 def __init__(self, library, songs, parent=None):
     super(Information, self).__init__(dialog=False)
     self.set_default_size(400, 400)
     self.set_transient_for(qltk.get_top_parent(parent))
     self.enable_window_tracking("quodlibet_information")
     if len(songs) > 1:
         connect_destroy(library, 'changed', self.__check_changed)
     if len(songs) > 0:
         connect_destroy(library, 'removed', self.__check_removed)
     self.__songs = songs
     self.__update(library)
     self.get_child().show_all()

    def __init__(self, player, library):
        super(SeekBar, self).__init__()

        self._elapsed_label = TimeLabel()
        self._remaining_label = TimeLabel()
        scale = Gtk.Scale(orientation=Gtk.Orientation.HORIZONTAL)
        scale.set_adjustment(Gtk.Adjustment.new(0, 0, 0, 3, 15, 0))
        scale.set_draw_value(False)
        self._scale = scale

        self.pack_start(Align(self._elapsed_label, border=6), False, True, 0)
        self.pack_start(scale, True, True, 0)
        self.pack_start(Align(self._remaining_label, border=6), False, True, 0)
        for child in self.get_children():
            child.show_all()

        self._id = self._scale.connect("value-changed", self._on_user_changed, player)
        self._scale.connect("value-changed", self._on_scale_value_changed, player)

        self._tracker = TimeTracker(player)
        self._tracker.connect("tick", self._on_tick, player)

        connect_destroy(player, "seek", self._on_player_seek)
        connect_destroy(player, "song-started", self._on_song_started)
        connect_destroy(player, "notify::seekable", self._on_seekable_changed)

        connect_destroy(library, "changed", self._on_song_changed, player)

        self.connect("destroy", self._on_destroy)

        with self._inhibit():
            self._update(player)
        self._tracker.tick()

    def test_main(self):
        from gi.repository import Gtk

        b = Gtk.Button()

        class A(Gtk.Button):
            def foo(self):
                pass

        a = A()
        ref = sys.getrefcount(a)
        util.connect_destroy(b, "clicked", a.foo)
        self.assertEqual(sys.getrefcount(a), ref + 1)
        a.destroy()
        self.assertEqual(sys.getrefcount(a), ref)

    def __init__(self, model):
        super(DuplicateSongsView, self).__init__(model)
        connect_obj(self, 'row-activated',
                            self.__select_song, app.player)
        # Selecting multiple is a nice feature it turns out.
        self.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE)

        # Handle signals propagated from the underlying library
        self.connected_library_sigs = []
        SIGNAL_MAP = {
            'removed': self._removed,
            'added': self._added,
            'changed': self._changed
        }
        for (sig, callback) in SIGNAL_MAP.items():
            print_d("Listening to library.%s signals" % sig)
            connect_destroy(app.library, sig, callback)

    def __init__(self, parent, player, library):
        super(TopBar, self).__init__()

        # play controls
        control_item = Gtk.ToolItem()
        self.insert(control_item, 0)
        t = PlayControls(player, library.librarian)
        self.volume = t.volume
        control_item.add(t)

        self.insert(Gtk.SeparatorToolItem(), 1)

        info_item = Gtk.ToolItem()
        self.insert(info_item, 2)
        info_item.set_expand(True)

        box = Gtk.Box(spacing=6)
        info_item.add(box)
        qltk.add_css(self, "GtkToolbar {padding: 3px;}")

        # song text
        info_pattern_path = os.path.join(const.USERDIR, "songinfo")
        text = SongInfo(library.librarian, player, info_pattern_path)
        box.pack_start(Alignment(text, border=3), True, True, 0)

        # cover image
        self.image = CoverImage(resize=True)
        connect_destroy(player, 'song-started', self.__new_song)

        # FIXME: makes testing easier
        if app.cover_manager:
            connect_destroy(
                app.cover_manager, 'cover-changed',
                self.__song_art_changed, library)

        # CoverImage doesn't behave in a Alignment, so wrap it
        coverbox = Gtk.Box()
        coverbox.pack_start(self.image, True, True, 0)
        box.pack_start(Alignment(coverbox, border=2), False, True, 0)

        for child in self.get_children():
            child.show_all()

        context = self.get_style_context()
        context.add_class("primary-toolbar")

    def _create_category_widget(self):
        scrolled_window = ScrolledWindow()
        scrolled_window.show()
        scrolled_window.set_shadow_type(Gtk.ShadowType.IN)
        self.view = view = RCMHintedTreeView()
        view.show()
        view.set_headers_visible(False)
        scrolled_window.set_policy(
            Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
        scrolled_window.add(view)
        model = Gtk.ListStore(int, str, str, str, bool)
        filters = self.filters
        for (i, (name, data)) in enumerate(filters):
            filter_type, icon, query, always = data
            enabled = always
            model.append(row=[filter_type, icon, name, query, enabled])

        def search_func(model, column, key, iter, data):
            return key.lower() not in model[iter][column].lower()

        view.set_search_column(self.ModelIndex.NAME)
        view.set_search_equal_func(search_func, None)

        column = Gtk.TreeViewColumn("Songs")
        column.set_sizing(Gtk.TreeViewColumnSizing.FIXED)
        renderpb = Gtk.CellRendererPixbuf()
        renderpb.props.xpad = 6
        renderpb.props.ypad = 6
        column.pack_start(renderpb, False)
        column.add_attribute(renderpb, "icon-name", self.ModelIndex.ICON_NAME)
        render = Gtk.CellRendererText()
        render.set_property('ellipsize', Pango.EllipsizeMode.END)

        def cdf(column, cell, model, iter_, user_data):
            on = (self.login_state == State.LOGGED_IN or
                  model[iter_][self.ModelIndex.ALWAYS_ENABLE])
            cell.set_sensitive(on)
        column.set_cell_data_func(render, cdf)
        column.set_cell_data_func(renderpb, cdf)

        view.append_column(column)
        column.pack_start(render, True)
        column.add_attribute(render, "text", self.ModelIndex.NAME)
        view.set_model(model)

        selection = view.get_selection()

        def select_func(sel, model, path, value):
            return (self.login_state == State.LOGGED_IN or
                    model[model.get_iter(path)][self.ModelIndex.ALWAYS_ENABLE])

        selection.set_select_function(select_func)
        self._refresh_online_filters()
        self.__changed_sig = connect_destroy(selection, 'changed',
                                             DeferredSignal(self._on_select))
        return scrolled_window

    def __init__(self, player, library):
        super(WaveformSeekBar, self).__init__()

        self._player = player
        self._rms_vals = []
        self._hovering = False

        self._elapsed_label = TimeLabel()
        self._remaining_label = TimeLabel()
        self._waveform_scale = WaveformScale(player)

        self.pack_start(Align(self._elapsed_label, border=6), False, True, 0)
        self.pack_start(self._waveform_scale, True, True, 0)
        self.pack_start(Align(self._remaining_label, border=6), False, True, 0)

        for child in self.get_children():
            child.show_all()
        self.set_time_label_visibility(CONFIG.show_time_labels)

        self._waveform_scale.connect('size-allocate',
                                     self._update_redraw_interval)
        self._waveform_scale.connect('motion-notify-event',
                                     self._on_mouse_hover)
        self._waveform_scale.connect('leave-notify-event',
                                     self._on_mouse_leave)

        self._label_tracker = TimeTracker(player)
        self._label_tracker.connect('tick', self._on_tick_label, player)

        self._redraw_tracker = TimeTracker(player)
        self._redraw_tracker.connect('tick', self._on_tick_waveform, player)

        connect_destroy(player, 'seek', self._on_player_seek)
        connect_destroy(player, 'song-started', self._on_song_started)
        connect_destroy(player, 'song-ended', self._on_song_ended)
        connect_destroy(player, 'notify::seekable', self._on_seekable_changed)
        connect_destroy(library, 'changed', self._on_song_changed, player)

        self.connect('destroy', self._on_destroy)
        self._update(player)

        if player.info:
            self._create_waveform(player.info, CONFIG.max_data_points)

    def __init__(self, player, library):
        hbox = Gtk.HBox(spacing=3)
        l = TimeLabel()
        self._time_label = l
        hbox.pack_start(l, True, True, 0)
        arrow = Gtk.Arrow.new(Gtk.ArrowType.RIGHT, Gtk.ShadowType.NONE)
        hbox.pack_start(arrow, False, True, 0)
        super(SeekBar, self).__init__(hbox)

        self._slider_label = TimeLabel()
        self.set_slider_widget(self._slider_label)

        self._on_seekable_changed(player)
        connect_destroy(player, "notify::seekable", self._on_seekable_changed)

        self.scale.connect('button-press-event', self.__seek_lock)
        self.scale.connect('button-release-event', self.__seek_unlock, player)
        self.scale.connect('key-press-event', self.__seek_lock)
        self.scale.connect('key-release-event', self.__seek_unlock, player)
        self.connect('scroll-event', self.__scroll, player)
        self.scale.connect('value-changed', self.__update_time, l)

        m = Gtk.Menu()
        c = ConfigCheckMenuItem(
            _("Display remaining time"), "player", "time_remaining")
        c.set_active(config.getboolean("player", "time_remaining"))
        connect_obj(c, 'toggled', self.scale.emit, 'value-changed')
        self.__remaining = c
        m.append(c)
        m.append(SeparatorMenuItem())
        i = qltk.MenuItem(_(u"_Edit Bookmarks…"), Icons.EDIT)

        def edit_bookmarks_cb(menu_item):
            window = bookmarks.EditBookmarks(self, library, player)
            window.show()

        i.connect('activate', edit_bookmarks_cb)
        m.append(i)
        m.show_all()
        m.attach_to_widget(self, None)
        connect_obj(self,
            'button-press-event', self.__check_menu, m, player, c)
        connect_obj(self, 'popup-menu', self.__popup_menu, m, player)

        timer = TimeTracker(player)
        connect_obj(timer, 'tick', self.__check_time, player)

        connect_destroy(
            library, "changed", self.__songs_changed, player, m)

        connect_destroy(player, 'song-started', self.__song_started, m)
        connect_destroy(player, 'seek', self.__seeked)

    def __init__(self, plugin_handler, filter_types=None):
        super(FilterPluginBox, self).__init__()

        # static filters
        if filter_types is None:
            filter_types = []

        filters = [Kind() for Kind in filter_types]
        filters.sort()
        for f in filters:
            self.pack_start(f, True, True, 0)
        self.__filters = filters

        # plugins
        self.__plugins = []
        hb = Gtk.HBox()
        expander = Gtk.Expander(label=_(u"_More options…"))
        expander.set_use_underline(True)
        expander.set_no_show_all(True)
        hb.pack_start(expander, True, True, 0)
        self.pack_start(hb, False, True, 0)

        for filt in filters:
            filt.connect('preview', lambda *x: self.emit("preview"))

        vbox = Gtk.VBox()
        expander.add(vbox)

        connect_destroy(plugin_handler,
            "changed", self.__refresh_plugins, vbox, expander)

        expander.connect("notify::expanded", self.__notify_expanded, vbox)
        expander.set_expanded(False)

        for child in self.get_children():
            child.show()

        plugin_handler.changed()

    def __init__(self, library, player):
        super(QueueExpander, self).__init__(spacing=3)
        sw = ScrolledWindow()
        sw.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
        sw.set_shadow_type(Gtk.ShadowType.IN)
        self.queue = PlayQueue(library, player)
        self.queue.props.expand = True
        sw.add(self.queue)

        add_css(self, ".ql-expanded title { margin-bottom: 5px; }")

        outer = ExpandBoxHack(spacing=12)

        left = Gtk.HBox(spacing=12)

        hb2 = Gtk.HBox(spacing=3)
        state_icon = PlaybackStatusIcon()
        state_icon.stop()
        state_icon.show()
        hb2.pack_start(state_icon, True, True, 0)
        name_label = Gtk.Label(label=_("_Queue"), use_underline=True)
        hb2.pack_start(name_label, True, True, 0)
        left.pack_start(hb2, False, True, 0)

        b = SmallImageButton(
            image=SymbolicIconImage(Icons.EDIT_CLEAR, Gtk.IconSize.MENU))
        b.set_tooltip_text(_("Remove all songs from the queue"))
        b.connect('clicked', self.__clear_queue)
        b.set_no_show_all(True)
        b.set_relief(Gtk.ReliefStyle.NONE)
        left.pack_start(b, False, False, 0)

        self.count_label = count_label = Gtk.Label()
        left.pack_start(count_label, False, True, 0)

        outer.pack_start(left, True, True, 0)

        close_button = SmallImageButton(
            image=SymbolicIconImage("window-close", Gtk.IconSize.MENU),
            relief=Gtk.ReliefStyle.NONE)

        close_button.connect("clicked", lambda *x: self.hide())

        outer.pack_start(close_button, False, False, 6)
        self.set_label_fill(True)

        cb = ConfigCheckButton(
            _("_Random"), "memory", "shufflequeue")
        cb.connect('toggled', self.__queue_shuffle, self.queue.model)
        cb.set_active(config.getboolean("memory", "shufflequeue"))
        cb.set_no_show_all(True)
        left.pack_start(cb, False, True, 0)

        self.set_label_widget(outer)
        self.add(sw)
        connect_obj(self, 'notify::expanded', self.__expand, cb, b)

        targets = [
            ("text/x-quodlibet-songs", Gtk.TargetFlags.SAME_APP, DND_QL),
            ("text/uri-list", 0, DND_URI_LIST)
        ]
        targets = [Gtk.TargetEntry.new(*t) for t in targets]

        self.drag_dest_set(Gtk.DestDefaults.ALL, targets, Gdk.DragAction.COPY)
        self.connect('drag-motion', self.__motion)
        self.connect('drag-data-received', self.__drag_data_received)

        self.queue.model.connect_after('row-inserted',
            util.DeferredSignal(self.__check_expand), count_label)
        self.queue.model.connect_after('row-deleted',
            util.DeferredSignal(self.__update_count), count_label)

        connect_obj(self, 'notify::visible', self.__visible, cb, b)
        self.__update_count(self.model, None, count_label)

        connect_destroy(
            player, 'song-started', self.__update_state_icon, state_icon)
        connect_destroy(
            player, 'paused', self.__update_state_icon_pause,
            state_icon, True)
        connect_destroy(
            player, 'unpaused', self.__update_state_icon_pause,
            state_icon, False)

        # to make the children clickable if mapped
        # ....no idea why, but works
        def hack(expander):
            label = expander.get_label_widget()
            if label:
                label.unmap()
                label.map()
        self.connect("map", hack)

        self.set_expanded(config.getboolean("memory", "queue_expanded"))
        self.notify("expanded")

        for child in self.get_children():
            child.show_all()

    def __init__(self, library, dir=None):
        super(ExFalsoWindow, self).__init__(dialog=False)
        self.set_title("Ex Falso")
        self.set_default_size(750, 475)
        self.enable_window_tracking("exfalso")

        self.__library = library

        hp = ConfigRHPaned("memory", "exfalso_paned_position", 1.0)
        hp.set_border_width(0)
        hp.set_position(250)
        hp.show()
        self.add(hp)

        vb = Gtk.VBox()

        bbox = Gtk.HBox(spacing=6)

        about = Gtk.Button()
        about.add(Gtk.Image.new_from_icon_name(
            Icons.HELP_ABOUT, Gtk.IconSize.BUTTON))
        connect_obj(about, 'clicked', self.__show_about, self)
        bbox.pack_start(about, False, True, 0)

        def prefs_cb(*args):
            window = PreferencesWindow(self)
            window.show()

        def plugin_window_cb(*args):
            window = PluginWindow(self)
            window.show()

        menu = Gtk.Menu()
        plugin_item = MenuItem(_("_Plugins"), Icons.SYSTEM_RUN)
        plugin_item.connect("activate", plugin_window_cb)
        menu.append(plugin_item)

        pref_item = MenuItem(_("_Preferences"), Icons.PREFERENCES_SYSTEM)
        pref_item.connect("activate", prefs_cb)
        menu.append(pref_item)
        menu.show_all()

        menu_button = MenuButton(
                SymbolicIconImage(Icons.EMBLEM_SYSTEM, Gtk.IconSize.BUTTON),
                arrow=True, down=False)
        menu_button.set_menu(menu)
        bbox.pack_start(menu_button, False, True, 0)

        l = Gtk.Label()
        l.set_alignment(1.0, 0.5)
        l.set_ellipsize(Pango.EllipsizeMode.END)
        bbox.pack_start(l, True, True, 0)

        fs = MainFileSelector()

        vb.pack_start(fs, True, True, 0)
        vb.pack_start(Align(bbox, border=6), False, True, 0)
        vb.show_all()

        hp.pack1(vb, resize=True, shrink=False)

        nb = qltk.Notebook()
        nb.props.scrollable = True
        nb.show()
        for Page in [EditTags, TagsFromPath, RenameFiles, TrackNumbers]:
            page = Page(self, self.__library)
            page.show()
            nb.append_page(page)
        hp.pack2(nb, resize=True, shrink=False)
        fs.connect('changed', self.__changed, l)
        if dir:
            fs.go_to(dir)

        connect_destroy(self.__library, 'changed', self.__library_changed, fs)

        self.__save = None
        connect_obj(self, 'changed', self.set_pending, None)
        for c in fs.get_children():
            c.get_child().connect('button-press-event',
                self.__pre_selection_changed, fs, nb)
            c.get_child().connect('focus',
                                  self.__pre_selection_changed, fs, nb)
        fs.get_children()[1].get_child().connect('popup-menu',
                                                 self.__popup_menu, fs)
        self.emit('changed', [])

        self.get_child().show()

        self.__ag = Gtk.AccelGroup()
        key, mod = Gtk.accelerator_parse("<Primary>Q")
        self.__ag.connect(key, mod, 0, lambda *x: self.destroy())
        self.add_accel_group(self.__ag)

        # GtkosxApplication assumes the menu bar is mapped, so add
        # it but don't show it.
        self._dummy_osx_menu_bar = Gtk.MenuBar()
        vb.pack_start(self._dummy_osx_menu_bar, False, False, 0)

    def __init__(self, library):
        super(InternetRadio, self).__init__(spacing=12)
        self.set_orientation(Gtk.Orientation.VERTICAL)

        if not self.instances():
            self._init(library)
        self._register_instance()

        self.connect("destroy", self.__destroy)

        completion = LibraryTagCompletion(self.__stations)
        self.accelerators = Gtk.AccelGroup()
        self.__searchbar = search = SearchBarBox(completion=completion, accel_group=self.accelerators)
        search.connect("query-changed", self.__filter_changed)

        menu = Gtk.Menu()
        new_item = MenuItem(_(u"_New Station…"), Icons.LIST_ADD)
        new_item.connect("activate", self.__add)
        menu.append(new_item)
        update_item = MenuItem(_("_Update Stations"), Icons.VIEW_REFRESH)
        update_item.connect("activate", self.__update)
        menu.append(update_item)
        menu.show_all()

        button = MenuButton(SymbolicIconImage(Icons.EMBLEM_SYSTEM, Gtk.IconSize.MENU), arrow=True)
        button.set_menu(menu)

        def focus(widget, *args):
            qltk.get_top_parent(widget).songlist.grab_focus()

        search.connect("focus-out", focus)

        # treeview
        scrolled_window = ScrolledWindow()
        scrolled_window.show()
        scrolled_window.set_shadow_type(Gtk.ShadowType.IN)
        self.view = view = AllTreeView()
        view.show()
        view.set_headers_visible(False)
        scrolled_window.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
        scrolled_window.add(view)
        model = Gtk.ListStore(int, str, str, str)

        model.append(row=[self.TYPE_ALL, Icons.FOLDER, "__all", _("All Stations")])
        model.append(row=[self.TYPE_SEP, Icons.FOLDER, "", ""])
        # Translators: Favorite radio stations
        model.append(row=[self.TYPE_FAV, Icons.FOLDER, "__fav", _("Favorites")])
        model.append(row=[self.TYPE_SEP, Icons.FOLDER, "", ""])

        filters = self.filters
        for text, k in sorted([(filters.text(k), k) for k in filters.keys()]):
            model.append(row=[self.TYPE_FILTER, Icons.EDIT_FIND, k, text])

        model.append(row=[self.TYPE_NOCAT, Icons.FOLDER, "nocat", _("No Category")])

        def separator(model, iter, data):
            return model[iter][self.TYPE] == self.TYPE_SEP

        view.set_row_separator_func(separator, None)

        def search_func(model, column, key, iter, data):
            return key.lower() not in model[iter][column].lower()

        view.set_search_column(self.NAME)
        view.set_search_equal_func(search_func, None)

        column = Gtk.TreeViewColumn("genres")
        column.set_sizing(Gtk.TreeViewColumnSizing.FIXED)

        renderpb = Gtk.CellRendererPixbuf()
        renderpb.props.xpad = 3
        column.pack_start(renderpb, False)
        column.add_attribute(renderpb, "icon-name", self.ICON_NAME)

        render = Gtk.CellRendererText()
        render.set_property("ellipsize", Pango.EllipsizeMode.END)
        view.append_column(column)
        column.pack_start(render, True)
        column.add_attribute(render, "text", self.NAME)

        view.set_model(model)

        # selection
        selection = view.get_selection()
        selection.set_mode(Gtk.SelectionMode.MULTIPLE)
        self.__changed_sig = connect_destroy(selection, "changed", util.DeferredSignal(lambda x: self.activate()))

        box = Gtk.HBox(spacing=6)
        box.pack_start(search, True, True, 0)
        box.pack_start(button, False, True, 0)
        self._searchbox = Align(box, left=0, right=6, top=6)
        self._searchbox.show_all()

        def qbar_response(infobar, response_id):
            if response_id == infobar.RESPONSE_LOAD:
                self.__update()

        self.qbar = QuestionBar()
        self.qbar.connect("response", qbar_response)
        if self._is_library_empty():
#.........这里部分代码省略.........

    def __init__(self, library, player=None, update=False,
                 model_cls=PlaylistModel):
        super(SongList, self).__init__()
        self._register_instance(SongList)
        self.set_model(model_cls())
        self.info = SongInfoSelection(self)
        self.set_size_request(200, 150)
        self.set_rules_hint(True)
        self.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE)
        self.set_fixed_height_mode(True)
        self.__csig = self.connect('columns-changed', self.__columns_changed)
        self._first_column = None
        # A priority list of how to apply the sort keys.
        # might contain column header names not present...
        self._sort_sequence = []
        self.set_column_headers(self.headers)
        librarian = library.librarian or library

        connect_destroy(librarian, 'changed', self.__song_updated)
        connect_destroy(librarian, 'removed', self.__song_removed, player)

        if update:
            connect_destroy(librarian, 'added', self.__song_added)

        if player:
            connect_destroy(
                player, 'paused', lambda *x: self.__redraw_current())
            connect_destroy(
                player, 'unpaused', lambda *x: self.__redraw_current())
            connect_destroy(
                player, 'error', lambda *x: self.__redraw_current())

        self.connect('button-press-event', self.__button_press, librarian)
        self.connect('key-press-event', self.__key_press, librarian)

        self.setup_drop(library)
        self.disable_drop()

        self.set_search_equal_func(self.__search_func, None)

        self.connect('destroy', self.__destroy)