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models.py
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models.py
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# Copyright 2022 Thomas Leberbauer
# 2022 Nick Boultbee
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
from collections.abc import Callable
from gi.repository import GObject, Gio
from quodlibet import _, app, util
from quodlibet.library.song import SongLibrary
from quodlibet.qltk.models import ObjectModelSort, ObjectStore, ObjectModelFilter
from quodlibet.util.collection import Album
from quodlibet.util.i18n import numeric_phrase
from quodlibet.util.library import background_filter
class AlbumListItem(GObject.Object):
"""This model represents an entry for a specific album.
It will load the album cover and generate the album label on demand.
"""
def __init__(self, album: Album | None = None):
super().__init__()
self._album = album
self._cover = None
self._label = None
self.connect("notify::album", self._album_changed)
def load_cover(self,
size: int,
cancelable: Gio.Cancellable | None = None):
def callback(cover):
self._cover = cover
self.notify("cover")
manager = app.cover_manager
# Skip this during testing
if manager:
manager.get_pixbuf_many_async(
self._album.songs, size, size, cancelable, callback)
def format_label(self, pattern):
self._label = pattern % self._album
self.notify("label")
def _album_changed(self, model, prop):
self._label = None
@GObject.Property
def album(self):
return self._album
@GObject.Property
def cover(self):
return self._cover
@GObject.Property
def label(self):
return self._label
class AlbumListCountItem(AlbumListItem):
"""This model represents an entry for a set of albums.
It will generate a label containing the number of albums on demand.
"""
def load_cover(self, *args, **kwargs):
self.notify("cover")
def format_label(self, pattern=None):
n = self.__n_albums
title = util.bold(_("All Albums"))
number_phrase = numeric_phrase("%d album", "%d albums", n)
self._label = f"{title}\n{number_phrase}"
self.notify("label")
@GObject.Property
def n_albums(self):
return self.__n_albums
@n_albums.setter # type: ignore
def n_albums(self, value):
self.__n_albums = value
self.format_label()
class AlbumListModel(ObjectStore):
"""This model creates entries for albums from a library.
The first entry represents the whole set of albums in the library.
"""
def __init__(self, library: SongLibrary):
super().__init__()
self.__library = library
albums = library.albums
self.__sigs = [
albums.connect("added", self._add_albums),
albums.connect("removed", self._remove_albums),
albums.connect("changed", self._change_albums)
]
self.append(row=[AlbumListCountItem()])
self.append_many(AlbumListItem(a) for a in albums.values())
def destroy(self):
albums = self.__library.albums
for sig in self.__sigs:
albums.disconnect(sig)
self.__library = None
self.clear()
def _add_albums(self, library, added):
self.append_many(AlbumListItem(a) for a in added)
def _remove_albums(self, library, removed):
removed_albums = removed.copy()
iters_remove = []
for iter_, item in self.iterrows():
album = item.album
if album is not None and album in removed_albums:
removed_albums.remove(album)
iters_remove.append(iter_)
if not removed_albums:
break
for iter_ in iters_remove:
self.remove(iter_)
def _change_albums(self, library, changed):
changed_albums = changed.copy()
for iter_, item in self.iterrows():
album = item.album
if album is not None and album in changed_albums:
changed_albums.remove(album)
self.iter_changed(iter_)
if not changed_albums:
break
class AlbumListFilterModel(GObject.Object, Gio.ListModel):
"""This model filters entries in a child model.
The property "include_item_all" toggles visibility of the first entry of the
child model.
The property "filter" is a function which defines visibility for all
remaining entries of the child model. If "filter" is set to None, all
entries are visible.
"""
__item_all: AlbumListItem
__include_item_all: bool
__filter: Callable[[AlbumListItem], bool] | None = None
def __init__(self, child_model=None, include_item_all=True, **kwargs):
super().__init__(**kwargs)
self.__include_item_all = include_item_all
self._model = model = ObjectModelFilter(child_model=child_model)
self.__item_all = self._get_item(0)
self._update_n_albums()
# Tell the tree model that all nodes are visible, otherwise it does not
# emit the "row-changed" signal.
for row in model:
model.ref_node(row.iter)
model.set_visible_func(self._apply_filter)
self.__sigs = [
model.connect("row-changed", self._row_changed),
model.connect("row-inserted", self._row_inserted),
model.connect("row-deleted", self._row_deleted),
model.connect("rows-reordered", self._rows_reordered)
]
def destroy(self):
model = self._model
for sig in self.__sigs:
model.disconnect(sig)
self._model = None
@GObject.Property
def include_item_all(self):
return self.__include_item_all
@include_item_all.setter # type: ignore
def include_item_all(self, value):
if self.__include_item_all == value:
return
self.__include_item_all = value
removed, added = (0, 1) if value else (1, 0)
self.items_changed(0, removed, added)
@GObject.Property
def filter(self):
return self.__filter
@filter.setter # type: ignore
def filter(self, value):
b = background_filter()
if b is None and value is None:
f = None
elif b is None:
def f(item):
return value(item.album)
else:
def f(item):
return b(item.album) and value(item.album)
if f or self.__filter:
self.__filter = f
self._model.refilter()
def do_get_n_items(self):
return len(self)
def do_get_item(self, index):
return self[index]
def do_get_item_type(self):
return AlbumListItem
def __len__(self):
n = len(self._model)
if self.__include_item_all or n < 1:
return n
return n - 1
def __getitem__(self, index):
if not self.__include_item_all:
index += 1
return self._get_item(index)
def _get_item(self, index: int) -> AlbumListItem | None:
model = self._model
iter = model.iter_nth_child(None, index)
return model.get_value(iter) if iter else None
def _update_n_albums(self):
self.__item_all.props.n_albums = len(self._model) - 1
def _apply_filter(self, model, iter, _):
filter = self.__filter
if filter is None:
return True
item = model.get_value(iter)
if item is self.__item_all:
return True
return filter(item)
def _row_changed(self, model, path, iter):
item = model.get_value(iter)
item.notify("album")
def _row_inserted(self, model, path, iter):
# Ensure that the tree model will emit the "row-changed" signal
model.ref_node(iter)
index = path.get_indices()[0]
if not self.__include_item_all:
index -= 1
if index >= 0:
self.items_changed(index, 0, 1)
self._update_n_albums()
def _row_deleted(self, model, path):
index = path.get_indices()[0]
if not self.__include_item_all:
index -= 1
if index >= 0:
self.items_changed(index, 1, 0)
self._update_n_albums()
def _rows_reordered(self, model, path, iter, new_order):
n = len(self)
self.items_changed(0, n, n)
class AlbumListSortModel(ObjectModelSort):
"""This model sorts entries of a child model"""
pass