[gnome-games/wip/exalm/pause-collection] application-window: Pause loading in game

[Alexander Mikhaylenko <alexm src gnome org>]

commit 60d9f96aeeafade9471e0c5b71902bb3694ce4e7
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Thu Feb 14 10:36:00 2019 +0500

    application-window: Pause loading in game
    
    Improve performance by pausing collection loading when starting the game
    And resuming it when exiting to collection.

 src/core/game-collection.vala  | 12 ++++++++++--
 src/ui/application-window.vala |  6 +++++-
 src/ui/application.vala        | 14 ++++++++++----
 3 files changed, 25 insertions(+), 7 deletions(-)
---
diff --git a/src/core/game-collection.vala b/src/core/game-collection.vala
index ce954868..3dacd275 100644
--- a/src/core/game-collection.vala
+++ b/src/core/game-collection.vala
@@ -10,6 +10,8 @@ private class Games.GameCollection : Object {
        private HashTable<string, Array<UriGameFactory>> factories_for_mime_type;
        private HashTable<string, Array<UriGameFactory>> factories_for_scheme;
 
+       public bool paused { get; set; }
+
        construct {
                games = new GenericSet<Game> (Game.hash, Game.equal);
                factories_for_mime_type = new HashTable<string, Array<UriGameFactory>> (str_hash, str_equal);
@@ -61,10 +63,16 @@ private class Games.GameCollection : Object {
                return games[0];
        }
 
-       public async void search_games () {
+       public async bool search_games () {
                foreach (var source in sources)
-                       foreach (var uri in source)
+                       foreach (var uri in source) {
+                               if (paused)
+                                       return false;
+
                                yield add_uri (uri);
+                       }
+
+               return true;
        }
 
        private async UriGameFactory[] get_factories_for_uri (Uri uri) {
diff --git a/src/ui/application-window.vala b/src/ui/application-window.vala
index 0d6b80fa..0e1327b0 100644
--- a/src/ui/application-window.vala
+++ b/src/ui/application-window.vala
@@ -38,6 +38,8 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
                                break;
                        }
 
+                       app.set_pause_loading (ui_state != UiState.COLLECTION);
+
                        konami_code.reset ();
                }
        }
@@ -79,6 +81,7 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
        [GtkChild]
        private DisplayHeaderBar display_header_bar;
 
+       private Application app;
        private Settings settings;
 
        private Binding box_search_binding;
@@ -104,7 +107,8 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 
        private KonamiCode konami_code;
 
-       public ApplicationWindow (ListModel collection) {
+       public ApplicationWindow (Application app, ListModel collection) {
+               this.app = app;
                collection_box.collection = collection;
                collection.items_changed.connect (() => {
                        is_collection_empty = collection.get_n_items () == 0;
diff --git a/src/ui/application.vala b/src/ui/application.vala
index a448661f..95edb16b 100644
--- a/src/ui/application.vala
+++ b/src/ui/application.vala
@@ -219,6 +219,7 @@ public class Games.Application : Gtk.Application {
                var provider = load_css ("gtk-style.css");
                Gtk.StyleContext.add_provider_for_screen (screen, provider, 600);
 
+               init_game_sources ();
                load_game_list.begin ();
                ListStore list_store = new ListStore (typeof (Game));
                game_collection.game_added.connect ((game) => {
@@ -233,7 +234,7 @@ public class Games.Application : Gtk.Application {
                        return;
                }
 
-               window = new ApplicationWindow (list_store);
+               window = new ApplicationWindow (this, list_store);
                this.add_window (window);
                window.destroy.connect (() => {
                        quit_application ();
@@ -339,15 +340,20 @@ public class Games.Application : Gtk.Application {
        }
 
        internal async void load_game_list () {
-               init_game_sources ();
-
-               yield game_collection.search_games ();
+               if (!yield game_collection.search_games ())
+                       return;
 
                game_list_loaded = true;
                if (window != null)
                        window.loading_notification = false;
        }
 
+       public async void set_pause_loading (bool paused) {
+               game_collection.paused = paused;
+
+               load_game_list.begin ();
+       }
+
        private void preferences () {
                if (preferences_window != null) {
                        preferences_window.present ();