closures: Add a module for commonly used closures

cartridges/application.py

@@ -19,6 +19,11 @@ class Application(Adw.Application):
     def __init__(self):
         super().__init__(application_id=APP_ID)
 
+    @override
+    def do_startup(self):
+        Adw.Application.do_startup(self)
+        self.props.style_manager.props.color_scheme = Adw.ColorScheme.PREFER_DARK
+
         self.add_action_entries((
             ("quit", lambda *_: self.quit()),
             ("about", lambda *_: self._present_about_dialog()),
@@ -28,11 +33,6 @@ class Application(Adw.Application):
         sources.load()
         collections.load()
 
-    @override
-    def do_startup(self):
-        Adw.Application.do_startup(self)
-        Adw.StyleManager.get_default().props.color_scheme = Adw.ColorScheme.PREFER_DARK
-
     @override
     def do_activate(self):
         window = self.props.active_window or Window(application=self)

cartridges/gamepads.py

@@ -112,11 +112,6 @@ class Gamepad(GObject.Object):
             focus_widget.activate()
             return
 
-        if self.window.sidebar.get_focus_child():
-            selected_item = self.window.sidebar.get_selected_item()
-            self.window.navigate_sidebar(self.window.sidebar, item=selected_item)
-            return
-
         self.window.grid.activate_action(
             "list.activate-item",
             GLib.Variant.new_uint32(self._get_current_position()),
@@ -141,20 +136,7 @@ class Gamepad(GObject.Object):
             open_menu.grab_focus()
             return
 
-        grid_visible = self.window.view_stack.props.visible_child_name == "grid"
-        if self._is_focused_on_top_bar():
-            focus_widget = self.window.grid if grid_visible else self.window.sidebar
-
-        # If the grid is not visible (i.e no search results or imports)
-        # the searchbar is focused as a fallback.
-        fallback_child = (
-            self.window.grid
-            if self.window.sidebar.get_focus_child()
-            else self.window.sidebar
-        )
-        focus_widget = fallback_child if grid_visible else self.window.search_entry
-
-        focus_widget.grab_focus()
+        self.window.grid.grab_focus()
         self.window.props.focus_visible = True
 
     def _navigate_to_game_position(self, new_pos: int):
@@ -165,67 +147,24 @@ class Gamepad(GObject.Object):
 
     def _move_horizontally(self, direction: Gtk.DirectionType):
         if self._is_focused_on_top_bar():
-            if self.window.header_bar.child_focus(direction):
-                self.window.props.focus_visible = True
-                return
-
-            # The usual behaviour of child_focus() on the header bar on the
-            # left will result in the above child focus to fail, so
-            # we need to manually check the user is going left to then focus the
-            # sidebar.
-
-            if direction is not self._get_rtl_direction(
-                Gtk.DirectionType.RIGHT, Gtk.DirectionType.LEFT
-            ):
+            if not self.window.header_bar.child_focus(direction):
                 self.window.header_bar.keynav_failed(direction)
-                return
 
-            self.window.sidebar.grab_focus()
             self.window.props.focus_visible = True
             return
 
-        if self.window.sidebar.get_focus_child():
-            # The usual behaviour of child_focus() on the sidebar
-            # would result in the + button being focused, instead of the grid
-            # so we need to grab the focus of the grid if the user inputs the
-            # corresponding direction to the grid.
-
-            grid_direction = self._get_rtl_direction(
-                Gtk.DirectionType.LEFT, Gtk.DirectionType.RIGHT
-            )
-
-            # Focus the first game when re-entering from sidebar
-            if direction is grid_direction:
-                self.window.grid.scroll_to(0, Gtk.ListScrollFlags.FOCUS, None)
-                self.window.grid.grab_focus()
-                return
-
-            self.window.sidebar.keynav_failed(direction)
-            return
-
         if self._can_navigate_games_page():
-            if not self._get_focused_game():
-                return
-
-            new_pos = self._get_current_position() + (
-                -1
-                if direction
-                == self._get_rtl_direction(
-                    Gtk.DirectionType.RIGHT, Gtk.DirectionType.LEFT
+            self._navigate_to_game_position(
+                self._get_current_position()
+                + (
+                    -1
+                    if direction
+                    == self._get_rtl_direction(
+                        Gtk.DirectionType.RIGHT, Gtk.DirectionType.LEFT
+                    )
+                    else 1
                 )
-                else 1
             )
-
-            # If the user is focused on the first game and tries to go
-            # back another game, instead of failing, the focus should
-            # change to the sidebar.
-
-            if new_pos < 0:
-                self.window.sidebar.grab_focus()
-                self.window.props.focus_visible = True
-                return
-
-            self._navigate_to_game_position(new_pos)
             return
 
         if self.window.navigation_view.props.visible_page_tag == "details":
@@ -245,14 +184,6 @@ class Gamepad(GObject.Object):
             self.window.grid.grab_focus()
             return
 
-        if self.window.sidebar.get_focus_child():
-            if self.window.sidebar.child_focus(direction):
-                self.window.props.focus_visible = True
-                return
-
-            self.window.sidebar.keynav_failed(direction)
-            return
-
         if self._can_navigate_games_page():
             if not (game := self._get_focused_game()):
                 return

cartridges/sources/__init__.py

@@ -54,6 +54,8 @@ class _SourceModule(Protocol):
 class Source(GObject.Object, Gio.ListModel):  # pyright: ignore[reportIncompatibleMethodOverride]
     """A source of games to import."""
 
+    __gtype_name__ = __qualname__
+
     id = GObject.Property(type=str)
     name = GObject.Property(type=str)
     icon_name = GObject.Property(type=str)
@@ -65,11 +67,11 @@ class Source(GObject.Object, Gio.ListModel):  # pyright: ignore[reportIncompatib
 
         self.id, self.name, self._module = module.ID, module.NAME, module
         self.bind_property(
-            "name",
+            "id",
             self,
             "icon-name",
             GObject.BindingFlags.SYNC_CREATE,
-            lambda _, name: f"{name}-symbolic",
+            lambda _, ident: f"{ident}-symbolic",
         )
 
         try:

cartridges/ui/closures.py

@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
+
+from collections.abc import Callable
+from typing import Any
+
+from gi.repository import Gtk
+
+
+def _closure[**P, R](func: Callable[P, R]) -> object:  # gi._gtktemplate.CallThing
+    @Gtk.Template.Callback()
+    @staticmethod
+    def wrapper(_obj, *args: P.args, **kwargs: P.kwargs) -> R:
+        return func(*args, **kwargs)
+
+    return wrapper
+
+
+@_closure
+def boolean(value: object) -> bool:
+    """Get a boolean for `value`."""
+    return bool(value)
+
+
+@_closure
+def concat(*strings: str) -> str:
+    """Join `strings`."""
+    return "".join(strings)
+
+
+@_closure
+def either[T](first: T, second: T) -> T:
+    """Return `first` or `second`."""
+    return first or second
+
+
+@_closure
+def format_string(string: str, *args: Any) -> str:
+    """Format `string` with `args`."""
+    return string.format(*args)
+
+
+@_closure
+def if_else[T](condition: object, first: T, second: T) -> T:
+    """Return `first` or `second` depending on `condition`."""
+    return first if condition else second

cartridges/ui/collection-details.blp

@@ -2,7 +2,7 @@ using Gtk 4.0;
 using Adw 1;
 
 template $CollectionDetails: Adw.Dialog {
-  title: bind $_or(template.collection as <$Collection>.name, _("New Collection")) as <string>;
+  title: bind $either(template.collection as <$Collection>.name, _("New Collection")) as <string>;
   content-width: 360;
   default-widget: apply_button;
   focus-widget: name_entry;
@@ -31,7 +31,7 @@ template $CollectionDetails: Adw.Dialog {
       Button apply_button {
         action-name: "details.apply";
         icon-name: "apply-symbolic";
-        tooltip-text: bind $_if_else(template.collection as <$Collection>.in-model, _("Apply"), _("Add")) as <string>;
+        tooltip-text: bind $if_else(template.collection as <$Collection>.in-model, _("Apply"), _("Add")) as <string>;
 
         styles [
           "suggested-action",

cartridges/ui/collection_details.py

@@ -2,13 +2,14 @@
 # SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
 
 from itertools import product
-from typing import Any, NamedTuple, TypeVar, cast
+from typing import Any, NamedTuple, cast
 
 from gi.repository import Adw, Gio, GObject, Gtk
 
 from cartridges import collections
 from cartridges.collections import Collection
 from cartridges.config import PREFIX
+from cartridges.ui import closures
 
 
 class _Icon(NamedTuple):
@@ -40,8 +41,6 @@ _ICONS = (
     _Icon("fist", "✊"),
 )
 
-_T = TypeVar("_T")
-
 
 @Gtk.Template.from_resource(f"{PREFIX}/collection-details.ui")
 class CollectionDetails(Adw.Dialog):
@@ -56,6 +55,9 @@ class CollectionDetails(Adw.Dialog):
 
     _selected_icon: str
 
+    either = closures.either
+    if_else = closures.if_else
+
     @GObject.Property(type=Collection)
     def collection(self) -> Collection:
         """The collection that `self` represents."""
@@ -130,11 +132,3 @@ class CollectionDetails(Adw.Dialog):
 
         collections.save()
         self.close()
-
-    @Gtk.Template.Callback()
-    def _or(self, _obj, first: _T, second: _T) -> _T:
-        return first or second
-
-    @Gtk.Template.Callback()
-    def _if_else(self, _obj, condition: object, first: _T, second: _T) -> _T:
-        return first if condition else second

cartridges/ui/cover.blp

@@ -5,27 +5,27 @@ template $Cover: Adw.Bin {
   child: Adw.Clamp {
     orientation: vertical;
     unit: px;
-    maximum-size: bind _picture.height-request;
-    tightening-threshold: bind _picture.height-request;
+    maximum-size: bind template.height;
+    tightening-threshold: bind template.height;
 
     child: Adw.Clamp {
       unit: px;
-      maximum-size: bind _picture.width-request;
-      tightening-threshold: bind _picture.width-request;
+      maximum-size: bind template.width;
+      tightening-threshold: bind template.width;
 
       child: Adw.ViewStack {
         name: "cover";
-        visible-child-name: bind $_get_stack_child(template.paintable) as <string>;
+        visible-child-name: bind $if_else(template.paintable, "cover", "icon") as <string>;
         overflow: hidden;
         enable-transitions: true;
 
         Adw.ViewStackPage {
           name: "cover";
 
-          child: Picture _picture {
+          child: Picture {
             paintable: bind template.paintable;
-            width-request: 200;
-            height-request: 300;
+            width-request: bind template.width;
+            height-request: bind template.height;
             content-fit: cover;
           };
         }
@@ -34,7 +34,10 @@ template $Cover: Adw.Bin {
           name: "icon";
 
           child: Image {
-            icon-name: bind template.app-icon-name;
+            icon-name: bind $concat(
+              template.root as <Window>.application as <Application>.application-id,
+              "-symbolic"
+            ) as <string>;
             pixel-size: 80;
 
             styles [

cartridges/ui/cover.py

@@ -3,7 +3,8 @@
 
 from gi.repository import Adw, Gdk, GObject, Gtk
 
-from cartridges.config import APP_ID, PREFIX
+from cartridges.config import PREFIX
+from cartridges.ui import closures
 
 
 @Gtk.Template.from_resource(f"{PREFIX}/cover.ui")
@@ -12,12 +13,9 @@ class Cover(Adw.Bin):
 
     __gtype_name__ = __qualname__
 
-    picture = GObject.Property(lambda self: self._picture, type=Gtk.Picture)
     paintable = GObject.Property(type=Gdk.Paintable)
-    app_icon_name = GObject.Property(type=str, default=f"{APP_ID}-symbolic")
+    width = GObject.Property(type=int, default=200)
+    height = GObject.Property(type=int, default=300)
 
-    _picture = Gtk.Template.Child()
-
-    @Gtk.Template.Callback()
-    def _get_stack_child(self, _obj, paintable: Gdk.Paintable | None) -> str:
-        return "cover" if paintable else "icon"
+    concat = closures.concat
+    if_else = closures.if_else

cartridges/ui/game-details.blp

@@ -5,7 +5,7 @@ using Adw 1;
 template $GameDetails: Adw.NavigationPage {
   name: "details";
   tag: "details";
-  title: bind $_or(template.game as <$Game>.name, _("Add Game")) as <string>;
+  title: bind $either(template.game as <$Game>.name, _("Add Game")) as <string>;
   hidden => $_cancel();
 
   ShortcutController {
@@ -101,7 +101,7 @@ template $GameDetails: Adw.NavigationPage {
 
                   Label developer_label {
                     label: bind template.game as <$Game>.developer;
-                    visible: bind $_bool(template.game as <$Game>.developer) as <bool>;
+                    visible: bind $boolean(template.game as <$Game>.developer) as <bool>;
                     halign: start;
                     max-width-chars: 36;
                     wrap: true;
@@ -119,14 +119,20 @@ template $GameDetails: Adw.NavigationPage {
                     spacing: 9;
 
                     Label last_played_label {
-                      label: bind $_date_label(_("Last played: {}"), template.game as <$Game>.last_played) as <string>;
+                      label: bind $format_string(
+                        _("Last played: {}"),
+                        $_pretty_date(template.game as <$Game>.last_played) as <string>
+                      ) as <string>;
                       halign: start;
                       wrap: true;
                       wrap-mode: word_char;
                     }
 
                     Label added_label {
-                      label: bind $_date_label(_("Added: {}"), template.game as <$Game>.added) as <string>;
+                      label: bind $format_string(
+                        _("Added: {}"),
+                        $_pretty_date(template.game as <$Game>.added) as <string>
+                      ) as <string>;
                       halign: start;
                       wrap: true;
                       wrap-mode: word_char;
@@ -376,7 +382,7 @@ template $GameDetails: Adw.NavigationPage {
 
                     Button apply_button {
                       action-name: "details.apply";
-                      label: bind $_if_else(template.game as <$Game>.added, _("Apply"), _("Add")) as <string>;
+                      label: bind $if_else(template.game as <$Game>.added, _("Apply"), _("Add")) as <string>;
 
                       styles [
                         "pill",

cartridges/ui/game-item.blp

@@ -12,8 +12,8 @@ template $GameItem: Box {
 
   Adw.Clamp {
     unit: px;
-    maximum-size: bind cover.picture as <Picture>.width-request;
-    tightening-threshold: bind cover.picture as <Picture>.width-request;
+    maximum-size: bind cover.width;
+    tightening-threshold: bind cover.width;
 
     child: Overlay {
       child: $Cover cover {

cartridges/ui/game_details.py

@@ -7,7 +7,7 @@ import sys
 import time
 from datetime import UTC, datetime
 from gettext import gettext as _
-from typing import Any, TypeVar, cast
+from typing import Any, cast
 from urllib.parse import quote
 
 from gi.repository import Adw, Gdk, Gio, GLib, GObject, Gtk
@@ -16,6 +16,7 @@ from cartridges import games, sources
 from cartridges.config import PREFIX
 from cartridges.games import Game
 from cartridges.sources import imported
+from cartridges.ui import closures
 
 from .collections import CollectionsBox
 from .cover import Cover  # noqa: F401
@@ -26,8 +27,6 @@ _REQUIRED_PROPERTIES = {
     prop.name for prop in games.PROPERTIES if prop.editable and prop.required
 }
 
-_T = TypeVar("_T")
-
 
 @Gtk.Template.from_resource(f"{PREFIX}/game-details.ui")
 class GameDetails(Adw.NavigationPage):
@@ -44,6 +43,11 @@ class GameDetails(Adw.NavigationPage):
 
     sort_changed = GObject.Signal()
 
+    boolean = closures.boolean
+    either = closures.either
+    format_string = closures.format_string
+    if_else = closures.if_else
+
     @GObject.Property(type=Game)
     def game(self) -> Game:
         """The game whose details to show."""
@@ -147,14 +151,6 @@ class GameDetails(Adw.NavigationPage):
         else:
             self.collections_box.finish()
 
-    @Gtk.Template.Callback()
-    def _or(self, _obj, first: _T, second: _T) -> _T:
-        return first or second
-
-    @Gtk.Template.Callback()
-    def _if_else(self, _obj, condition: object, first: _T, second: _T) -> _T:
-        return first if condition else second
-
     @Gtk.Template.Callback()
     def _downscale_image(self, _obj, cover: Gdk.Texture | None) -> Gdk.Texture | None:
         if cover and (renderer := cast(Gtk.Native, self.props.root).get_renderer()):
@@ -165,10 +161,10 @@ class GameDetails(Adw.NavigationPage):
         return None
 
     @Gtk.Template.Callback()
-    def _date_label(self, _obj, label: str, timestamp: int) -> str:
+    def _pretty_date(self, _obj, timestamp: int) -> str:
         date = datetime.fromtimestamp(timestamp, UTC)
         now = datetime.now(UTC)
-        return label.format(
+        return (
             _("Never")
             if not timestamp
             else _("Today")
@@ -190,10 +186,6 @@ class GameDetails(Adw.NavigationPage):
             else date.strftime("%Y")
         )
 
-    @Gtk.Template.Callback()
-    def _bool(self, _obj, o: object) -> bool:
-        return bool(o)
-
     @Gtk.Template.Callback()
     def _format_more_info(self, _obj, label: str) -> str:
         executable = _("program")

cartridges/ui/games.py

@@ -19,7 +19,24 @@ _SORT_MODES = {
     "oldest": ("added", False),
 }
 
-model = Gtk.FlattenListModel.new(sources.model)
+filter_ = Gtk.EveryFilter()
+filter_.append(
+    Gtk.BoolFilter(
+        expression=Gtk.PropertyExpression.new(Game, None, "removed"),
+        invert=True,
+    )
+)
+filter_.append(
+    Gtk.BoolFilter(
+        expression=Gtk.PropertyExpression.new(Game, None, "blacklisted"),
+        invert=True,
+    )
+)
+model = Gtk.FilterListModel(
+    model=Gtk.FlattenListModel.new(sources.model),
+    filter=filter_,
+    watch_items=True,  # pyright: ignore[reportCallIssue]
+)
 
 
 class GameSorter(Gtk.Sorter):

cartridges/ui/meson.build

@@ -1,12 +1,14 @@
 python.install_sources(
     files(
         '__init__.py',
+        'closures.py',
         'collection_details.py',
         'collections.py',
         'cover.py',
         'game_details.py',
         'game_item.py',
         'games.py',
+        'sources.py',
         'window.py',
     ),
     subdir: 'cartridges' / 'ui',

cartridges/ui/sources.py

@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: Copyright 2025 Jamie Gravendeel
+
+from gi.repository import Adw, Gio, GObject, Gtk
+
+from cartridges import sources
+from cartridges.sources import Source
+from cartridges.ui import games
+
+
+class SourceSidebarItem(Adw.SidebarItem):  # pyright: ignore[reportAttributeAccessIssue]
+    """A sidebar item representing a source."""
+
+    model = GObject.Property(type=Gio.ListModel)
+
+    @GObject.Property(type=Source)
+    def source(self) -> Source:
+        """The source that `self` represents."""
+        return self._source
+
+    @source.setter
+    def source(self, source: Source):
+        self._source = source
+        flags = GObject.BindingFlags.SYNC_CREATE
+        source.bind_property("name", self, "title", flags)
+        source.bind_property("icon-name", self, "icon-name", flags)
+
+        self.model = Gtk.FilterListModel(
+            model=source,
+            filter=games.filter_,
+            watch_items=True,  # pyright: ignore[reportCallIssue]
+        )
+        # https://gitlab.gnome.org/GNOME/gtk/-/issues/7959
+        self.model.connect(
+            "items-changed",
+            lambda *_: self.set_property("visible", self.model.props.n_items),
+        )
+        self.props.visible = self.model.props.n_items
+
+
+model = Gtk.SortListModel.new(
+    sources.model,
+    Gtk.StringSorter.new(Gtk.PropertyExpression.new(Source, None, "name")),
+)

cartridges/ui/window.blp

@@ -94,6 +94,10 @@ template $Window: Adw.ApplicationWindow {
                 }
               }
 
+              Adw.SidebarSection sources {
+                title: _("Sources");
+              }
+
               Adw.SidebarSection collections {
                 title: _("Collections");
 
@@ -208,17 +212,17 @@ template $Window: Adw.ApplicationWindow {
             }
 
             content: Adw.ToastOverlay toast_overlay {
-              child: Adw.ViewStack view_stack {
-                visible-child-name: bind $_if_else(
+              child: Adw.ViewStack {
+                visible-child-name: bind $if_else(
                   grid.model as <NoSelection>.n-items,
                   "grid",
-                  $_if_else(
+                  $if_else(
                     template.search-text,
                     "empty-search",
-                    $_if_else(
+                    $if_else(
                       template.collection,
                       "empty-collection",
-                      $_if_else(template.show-hidden, "empty-hidden", "empty") as <string>
+                      $if_else(template.show-hidden, "empty-hidden", "empty") as <string>
                     ) as <string>
                   ) as <string>
                 ) as <string>;
@@ -262,16 +266,6 @@ template $Window: Adw.ApplicationWindow {
                                 expression: expr item as <$Game>.hidden;
                                 invert: bind template.show-hidden inverted;
                               }
-
-                              BoolFilter {
-                                expression: expr item as <$Game>.removed;
-                                invert: true;
-                              }
-
-                              BoolFilter {
-                                expression: expr item as <$Game>.blacklisted;
-                                invert: true;
-                              }
                             };
 
                             model: bind template.model;
@@ -316,7 +310,10 @@ template $Window: Adw.ApplicationWindow {
 
                   child: Adw.StatusPage {
                     icon-name: bind template.collection as <$Collection>.icon-name;
-                    title: bind $_format(_("No Games in {}"), template.collection as <$Collection>.name) as <string>;
+                    title: bind $format_string(
+                      _("No Games in {}"),
+                      template.collection as <$Collection>.name,
+                    ) as <string>;
                   };
                 }
 

cartridges/ui/window.py

@@ -6,21 +6,22 @@
 import sys
 from collections.abc import Callable
 from gettext import gettext as _
-from typing import Any, TypeVar, cast
+from typing import Any, cast
 
 from gi.repository import Adw, Gio, GLib, GObject, Gtk
 
 from cartridges import STATE_SETTINGS
 from cartridges.collections import Collection
 from cartridges.config import PREFIX, PROFILE
-from cartridges.sources import imported
-from cartridges.ui import collections, games
+from cartridges.sources import Source, imported
+from cartridges.ui import closures, collections, games, sources
 
 from .collection_details import CollectionDetails
 from .collections import CollectionFilter, CollectionSidebarItem
 from .game_details import GameDetails
 from .game_item import GameItem  # noqa: F401
 from .games import GameSorter
+from .sources import SourceSidebarItem
 
 if sys.platform.startswith("linux"):
     from cartridges import gamepads
@@ -34,7 +35,6 @@ SORT_MODES = {
     "oldest": ("added", True),
 }
 
-_T = TypeVar("_T")
 type _UndoFunc = Callable[[], Any]
 
 
@@ -46,6 +46,7 @@ class Window(Adw.ApplicationWindow):
 
     split_view: Adw.OverlaySplitView = Gtk.Template.Child()
     sidebar: Adw.Sidebar = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
+    sources: Adw.SidebarSection = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
     collections: Adw.SidebarSection = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
     new_collection_item: Adw.SidebarItem = Gtk.Template.Child()  # pyright: ignore[reportAttributeAccessIssue]
     collection_menu: Gio.Menu = Gtk.Template.Child()
@@ -56,7 +57,6 @@ class Window(Adw.ApplicationWindow):
     sort_button: Gtk.MenuButton = Gtk.Template.Child()
     main_menu_button: Gtk.MenuButton = Gtk.Template.Child()
     toast_overlay: Adw.ToastOverlay = Gtk.Template.Child()
-    view_stack: Adw.ViewStack = Gtk.Template.Child()
     grid: Gtk.GridView = Gtk.Template.Child()
     sorter: GameSorter = Gtk.Template.Child()
     collection_filter: CollectionFilter = Gtk.Template.Child()
@@ -73,6 +73,9 @@ class Window(Adw.ApplicationWindow):
     _collection_removed_signal: int | None = None
     _selected_sidebar_item = 0
 
+    format_string = closures.format_string
+    if_else = closures.if_else
+
     @GObject.Property(type=Collection)
     def collection(self) -> Collection | None:
         """The currently selected collection."""
@@ -110,6 +113,7 @@ class Window(Adw.ApplicationWindow):
 
         # https://gitlab.gnome.org/GNOME/gtk/-/issues/7901
         self.search_entry.set_key_capture_widget(self)
+        self.sources.bind_model(sources.model, self._create_source_item)
         self.collections.bind_model(
             collections.model,
             lambda collection: CollectionSidebarItem(collection=collection),
@@ -164,26 +168,17 @@ class Window(Adw.ApplicationWindow):
 
         self.toast_overlay.add_toast(toast)
 
-    def navigate_sidebar(self, sidebar: Adw.Sidebar, item: Adw.SidebarItem):  # pyright: ignore[reportAttributeAccessIssue]
-        """Select given item in the sidebar.
+    def _create_source_item(self, source: Source) -> SourceSidebarItem:
+        item = SourceSidebarItem(source=source)
+        item.connect(
+            "notify::visible",
+            lambda item, _: self._source_empty() if not item.props.visible else None,
+        )
+        return item
 
-        Item should correspond to a collection, or the all game category/
-        new collection buttons.
-        """
-        match item:
-            case self.new_collection_item:
-                self._add_collection()
-                sidebar.props.selected = self._selected_sidebar_item
-            case CollectionSidebarItem():
-                self.collection = item.collection
-            case _:
-                self.collection = None
-
-        if item is not self.new_collection_item:
-            self._selected_sidebar_item = sidebar.props.selected
-
-        if self.split_view.props.collapsed:
-            self.split_view.props.show_sidebar = False
+    def _source_empty(self):
+        self.model = games.model
+        self.sidebar.props.selected = 0
 
     @Gtk.Template.Callback()
     def _show_sidebar_title(self, _obj, layout: str) -> bool:
@@ -192,7 +187,27 @@ class Window(Adw.ApplicationWindow):
 
     @Gtk.Template.Callback()
     def _navigate(self, sidebar: Adw.Sidebar, index: int):  # pyright: ignore[reportAttributeAccessIssue]
-        self.navigate_sidebar(sidebar, sidebar.get_item(index))
+        item = sidebar.get_item(index)
+
+        match item:
+            case self.new_collection_item:
+                self._add_collection()
+                sidebar.props.selected = self._selected_sidebar_item
+            case SourceSidebarItem():
+                self.collection = None
+                self.model = item.model
+            case CollectionSidebarItem():
+                self.collection = item.collection
+                self.model = games.model
+            case _:
+                self.collection = None
+                self.model = games.model
+
+        if item is not self.new_collection_item:
+            self._selected_sidebar_item = index
+
+        if self.split_view.props.collapsed:
+            self.split_view.props.show_sidebar = False
 
     @Gtk.Template.Callback()
     def _update_selection(self, sidebar: Adw.Sidebar, *_args):  # pyright: ignore[reportAttributeAccessIssue]
@@ -220,14 +235,6 @@ class Window(Adw.ApplicationWindow):
             Gamepad.window = self  # pyright: ignore[reportPossiblyUnboundVariable]
             gamepads.setup_monitor()  # pyright: ignore[reportPossiblyUnboundVariable]
 
-    @Gtk.Template.Callback()
-    def _if_else(self, _obj, condition: object, first: _T, second: _T) -> _T:
-        return first if condition else second
-
-    @Gtk.Template.Callback()
-    def _format(self, _obj, string: str, *args: Any) -> str:
-        return string.format(*args)
-
     @Gtk.Template.Callback()
     def _show_details(self, grid: Gtk.GridView, position: int):
         self.details.game = cast(Gio.ListModel, grid.props.model).get_item(position)

data/icons/heroic-symbolic.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="none"><path fill="#000" fill-rule="evenodd" d="m7.872 16-3.817-3.083L2 2.79 7.872 0l5.871 2.789-2.055 10.128zm0-4.257-.294-.293-.88-7.927 1.1-1.908 1.174 1.908-.807 7.927zm-.294.367-.147.367-1.761.294-.294-.66.294-.662 1.761.294zm-.073.734-.22 1.541.587.294.587-.294-.22-1.541-.367-.22zm.807-.367-.147-.367.147-.367 1.761-.293.294.66-.294.66z" clip-rule="evenodd"/></svg>

data/icons/icons.gresource.xml.in

@@ -4,6 +4,10 @@
     <file>apply-symbolic.svg</file>
     <file>cancel-symbolic.svg</file>
     <file>filter-symbolic.svg</file>
+    <!-- Sources -->
+    <file>heroic-symbolic.svg</file>
+    <file>imported-symbolic.svg</file>
+    <file>steam-symbolic.svg</file>
     <!-- Categories -->
     <file>collection-symbolic.svg</file>
     <file>ball-symbolic.svg</file>

data/icons/imported-symbolic.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><path fill="#222" d="M7 1v6H1v2h6v6h2V9h6V7H9V1zm0 0"/></svg>

data/icons/steam-symbolic.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="none"><g clip-path="url(#a)"><path fill="#000" fill-rule="evenodd" d="M9.352 5.1a1.509 1.509 0 1 0 2.51 1.675A1.509 1.509 0 0 0 9.352 5.1m2.923-.277a2.009 2.009 0 1 1-3.34 2.231 2.009 2.009 0 0 1 3.34-2.23ZM5.01 12.131l-.983-.407a1.7 1.7 0 0 0 3.108-.103 1.696 1.696 0 0 0-1.213-2.29 1.7 1.7 0 0 0-.966.07l1.015.421a1.249 1.249 0 0 1-.96 2.307zM2.546 2.121A8 8 0 0 1 7.966 0l.003.013a7.99 7.99 0 0 1 7.159 4.432 7.996 7.996 0 0 1-4.277 11.018 7.99 7.99 0 0 1-8.274-1.558A8 8 0 0 1 .279 10.18l3.064 1.267A2.264 2.264 0 0 0 7.823 11v-.107l2.718-1.938h.063A3.016 3.016 0 1 0 7.589 5.94v.031l-1.906 2.76h-.126c-.454 0-.898.138-1.273.395L0 7.354A8 8 0 0 1 2.546 2.12Z" clip-rule="evenodd"/></g><defs><clipPath id="a"><path fill="#fff" d="M0 0h16v16H0z"/></clipPath></defs></svg>

po/POTFILES.in

@@ -6,6 +6,7 @@ cartridges/sources/__init__.py
 cartridges/sources/heroic.py
 cartridges/sources/imported.py
 cartridges/sources/steam.py
+cartridges/ui/closures.py
 cartridges/ui/collection-details.blp
 cartridges/ui/collection_details.py
 cartridges/ui/collections.py
@@ -17,6 +18,7 @@ cartridges/ui/game_details.py
 cartridges/ui/game_item.py
 cartridges/ui/games.py
 cartridges/ui/shortcuts-dialog.blp
+cartridges/ui/sources.py
 cartridges/ui/window.blp
 cartridges/ui/window.py
 data/page.kramo.Cartridges.desktop.in