Implement Language filter

osu.Game.Tests/Visual/Online/TestSceneBeatmapListingOverlay.cs

@@ -37,6 +37,12 @@ namespace osu.Game.Tests.Visual.Online
             AddStep("Show Anime genre", () => overlay.ShowGenre(BeatmapSearchGenre.Anime));
         }
 
+        [Test]
+        public void TestShowLanguage()
+        {
+            AddStep("Show Japanese language", () => overlay.ShowLanguage(BeatmapSearchLanguage.Japanese));
+        }
+
         [Test]
         public void TestShow()
         {

osu.Game/Online/API/Requests/SearchBeatmapSetsRequest.cs

@@ -17,9 +17,10 @@ namespace osu.Game.Online.API.Requests
         private readonly DirectSortCriteria sortCriteria;
         private readonly SortDirection direction;
         private readonly BeatmapSearchGenre genre;
+        private readonly BeatmapSearchLanguage language;
         private string directionString => direction == SortDirection.Descending ? @"desc" : @"asc";
 
-        public SearchBeatmapSetsRequest(string query, RulesetInfo ruleset, BeatmapSearchCategory searchCategory = BeatmapSearchCategory.Any, DirectSortCriteria sortCriteria = DirectSortCriteria.Ranked, SortDirection direction = SortDirection.Descending, BeatmapSearchGenre genre = BeatmapSearchGenre.Any)
+        public SearchBeatmapSetsRequest(string query, RulesetInfo ruleset, BeatmapSearchCategory searchCategory = BeatmapSearchCategory.Any, DirectSortCriteria sortCriteria = DirectSortCriteria.Ranked, SortDirection direction = SortDirection.Descending, BeatmapSearchGenre genre = BeatmapSearchGenre.Any, BeatmapSearchLanguage language = BeatmapSearchLanguage.Any)
         {
             this.query = string.IsNullOrEmpty(query) ? string.Empty : System.Uri.EscapeDataString(query);
             this.ruleset = ruleset;
@@ -27,6 +28,7 @@ namespace osu.Game.Online.API.Requests
             this.sortCriteria = sortCriteria;
             this.direction = direction;
             this.genre = genre;
+            this.language = language;
         }
 
         protected override WebRequest CreateWebRequest()
@@ -42,6 +44,9 @@ namespace osu.Game.Online.API.Requests
             if (genre != BeatmapSearchGenre.Any)
                 req.AddParameter("g", ((int)genre).ToString());
 
+            if (language != BeatmapSearchLanguage.Any)
+                req.AddParameter("l", ((int)language).ToString());
+
             req.AddParameter("sort", $"{sortCriteria.ToString().ToLowerInvariant()}_{directionString}");
 
             return req;
@@ -86,4 +91,20 @@ namespace osu.Game.Online.API.Requests
         Hiphop = 9,
         Electronic
     }
+
+    public enum BeatmapSearchLanguage
+    {
+        Any,
+        English = 2,
+        Chilnese = 4,
+        French = 7,
+        German,
+        Italian = 11,
+        Japanese = 3,
+        Korean = 6,
+        Spanish = 10,
+        Swedish = 9,
+        Instrumantal = 5,
+        Other = 1
+    }
 }

osu.Game/Overlays/BeatmapListing/BeatmapListingSearchSection.cs

@@ -27,6 +27,8 @@ namespace osu.Game.Overlays.BeatmapListing
 
         public Bindable<BeatmapSearchGenre> Genre => genreFilter.Current;
 
+        public Bindable<BeatmapSearchLanguage> Language => languageFilter.Current;
+
         public BeatmapSetInfo BeatmapSet
         {
             set
@@ -46,6 +48,7 @@ namespace osu.Game.Overlays.BeatmapListing
         private readonly BeatmapSearchRulesetFilterRow modeFilter;
         private readonly BeatmapSearchFilterRow<BeatmapSearchCategory> categoryFilter;
         private readonly BeatmapSearchSmallFilterRow<BeatmapSearchGenre> genreFilter;
+        private readonly BeatmapSearchSmallFilterRow<BeatmapSearchLanguage> languageFilter;
 
         private readonly Box background;
         private readonly UpdateableBeatmapSetCover beatmapCover;
@@ -102,6 +105,7 @@ namespace osu.Game.Overlays.BeatmapListing
                                     modeFilter = new BeatmapSearchRulesetFilterRow(),
                                     categoryFilter = new BeatmapSearchFilterRow<BeatmapSearchCategory>(@"Categories"),
                                     genreFilter = new BeatmapSearchSmallFilterRow<BeatmapSearchGenre>(@"Genre"),
+                                    languageFilter = new BeatmapSearchSmallFilterRow<BeatmapSearchLanguage>(@"Language"),
                                 }
                             }
                         }

osu.Game/Overlays/BeatmapListingOverlay.cs

@@ -155,6 +155,7 @@ namespace osu.Game.Overlays
             searchSection.Ruleset.BindValueChanged(_ => queueUpdateSearch());
             searchSection.Category.BindValueChanged(_ => queueUpdateSearch());
             searchSection.Genre.BindValueChanged(_ => queueUpdateSearch());
+            searchSection.Language.BindValueChanged(_ => queueUpdateSearch());
             sortCriteria.BindValueChanged(_ => queueUpdateSearch());
             sortDirection.BindValueChanged(_ => queueUpdateSearch());
         }
@@ -185,12 +186,26 @@ namespace osu.Game.Overlays
             Show();
         }
 
+        public void ShowLanguage(BeatmapSearchLanguage language)
+        {
+            var currentLanguage = searchSection.Language.Value;
+
+            if (currentLanguage != language)
+            {
+                setDefaultSearchValues();
+                searchSection.Language.Value = language;
+            }
+
+            Show();
+        }
+
         private void setDefaultSearchValues()
         {
             searchSection.Query.Value = string.Empty;
             searchSection.Ruleset.Value = new RulesetInfo { Name = @"Any" };
             searchSection.Category.Value = BeatmapSearchCategory.Leaderboard;
             searchSection.Genre.Value = BeatmapSearchGenre.Any;
+            searchSection.Language.Value = BeatmapSearchLanguage.Any;
         }
 
         private ScheduledDelegate queryChangedDebounce;
@@ -224,7 +239,8 @@ namespace osu.Game.Overlays
                 searchSection.Category.Value,
                 sortControl.Current.Value,
                 sortControl.SortDirection.Value,
-                searchSection.Genre.Value);
+                searchSection.Genre.Value,
+                searchSection.Language.Value);
 
             getSetsRequest.Success += response => Schedule(() => recreatePanels(response));