1# Copyright 2021 The GNOME Music developers 2# 3# GNOME Music is free software; you can redistribute it and/or modify 4# it under the terms of the GNU General Public License as published by 5# the Free Software Foundation; either version 2 of the License, or 6# (at your option) any later version. 7# 8# GNOME Music is distributed in the hope that it will be useful, 9# but WITHOUT ANY WARRANTY; without even the implied warranty of 10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11# GNU General Public License for more details. 12# 13# You should have received a copy of the GNU General Public License along 14# with GNOME Music; if not, write to the Free Software Foundation, Inc., 15# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 16# 17# The GNOME Music authors hereby grant permission for non-GPL compatible 18# GStreamer plugins to be used and distributed together with GStreamer 19# and GNOME Music. This permission is above and beyond the permissions 20# granted by the GPL license by which GNOME Music is covered. If you 21# modify this code, you may extend this exception to your version of the 22# code, but you are not obligated to do so. If you do not wish to do so, 23# delete this exception statement from your version. 24 25from gi.repository import GLib, GObject, Gio 26 27 28class FileExistsAsync(GObject.GObject): 29 """Gio.File.file_exists async variant 30 """ 31 32 __gtype_name__ = "FileExistsAsync" 33 34 __gsignals__ = { 35 "finished": (GObject.SignalFlags.RUN_FIRST, None, (bool, )) 36 } 37 38 def __init__(self) -> None: 39 """Initialize FileExistsAsync 40 """ 41 super().__init__() 42 43 def start(self, thumb_file: Gio.File) -> None: 44 """Start async file_exists lookup 45 46 :param Gio.File thumb_file: File to check 47 """ 48 thumb_file.query_info_async( 49 Gio.FILE_ATTRIBUTE_STANDARD_TYPE, Gio.FileQueryInfoFlags.NONE, 50 GLib.PRIORITY_DEFAULT, None, self._on_query_info_finished) 51 52 def _on_query_info_finished( 53 self, thumb_file: Gio.File, res: Gio.AsyncResult) -> None: 54 exists = True 55 try: 56 thumb_file.query_info_finish(res) 57 except GLib.Error: 58 # This indicates that the file has not been created, so 59 # there is no art in the MediaArt cache. 60 exists = False 61 62 self.emit("finished", exists) 63