Update favourite statistic value on favourite button clicks

osu.Game.Tests/Visual/Beatmaps/TestSceneBeatmapCard.cs

@@ -9,8 +9,11 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.Drawables.Cards;
+using osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays;
 using osuTK;
@@ -20,6 +23,8 @@ namespace osu.Game.Tests.Visual.Beatmaps
 {
     public class TestSceneBeatmapCard : OsuTestScene
     {
+        private DummyAPIAccess dummyAPI => (DummyAPIAccess)API;
+
         private APIBeatmapSet[] testCases;
 
         #region Test case generation
@@ -164,6 +169,19 @@ namespace osu.Game.Tests.Visual.Beatmaps
 
         #endregion
 
+        [SetUpSteps]
+        public void SetUpSteps()
+        {
+            AddStep("register request handling", () => dummyAPI.HandleRequest = request =>
+            {
+                if (!(request is PostBeatmapFavouriteRequest))
+                    return false;
+
+                request.TriggerSuccess();
+                return true;
+            });
+        }
+
         private Drawable createContent(OverlayColourScheme colourScheme, Func<APIBeatmapSet, Drawable> creationFunc)
         {
             var colourProvider = new OverlayColourProvider(colourScheme);

osu.Game/Beatmaps/Drawables/Cards/BeatmapCard.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
@@ -35,6 +36,7 @@ namespace osu.Game.Beatmaps.Drawables.Cards
         private const float corner_radius = 10;
 
         private readonly APIBeatmapSet beatmapSet;
+        private readonly Bindable<BeatmapSetFavouriteState> favouriteState;
 
         private UpdateableOnlineBeatmapSetCover leftCover;
         private FillFlowContainer leftIconArea;
@@ -55,6 +57,7 @@ namespace osu.Game.Beatmaps.Drawables.Cards
             : base(HoverSampleSet.Submit)
         {
             this.beatmapSet = beatmapSet;
+            favouriteState = new Bindable<BeatmapSetFavouriteState>(new BeatmapSetFavouriteState(beatmapSet.HasFavourited, beatmapSet.FavouriteCount));
         }
 
         [BackgroundDependencyLoader]
@@ -108,7 +111,7 @@ namespace osu.Game.Beatmaps.Drawables.Cards
                         Spacing = new Vector2(0, 14),
                         Children = new BeatmapCardIconButton[]
                         {
-                            new FavouriteButton(beatmapSet),
+                            new FavouriteButton(beatmapSet) { Current = favouriteState },
                             new DownloadButton(beatmapSet)
                         }
                     }
@@ -312,7 +315,7 @@ namespace osu.Game.Beatmaps.Drawables.Cards
             if (beatmapSet.HypeStatus != null && beatmapSet.NominationStatus != null)
                 yield return new NominationsStatistic(beatmapSet.NominationStatus);
 
-            yield return new FavouritesStatistic(beatmapSet);
+            yield return new FavouritesStatistic(beatmapSet) { Current = favouriteState };
             yield return new PlayCountStatistic(beatmapSet);
 
             var dateStatistic = BeatmapCardDateStatistic.CreateFor(beatmapSet);

osu.Game/Beatmaps/Drawables/Cards/BeatmapSetFavouriteState.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Beatmaps.Drawables.Cards.Buttons;
+using osu.Game.Beatmaps.Drawables.Cards.Statistics;
+
+namespace osu.Game.Beatmaps.Drawables.Cards
+{
+    /// <summary>
+    /// Stores the current favourite state of a beatmap set.
+    /// Used to coordinate between <see cref="FavouriteButton"/> and <see cref="FavouritesStatistic"/>.
+    /// </summary>
+    public readonly struct BeatmapSetFavouriteState
+    {
+        /// <summary>
+        /// Whether the currently logged-in user has favourited this beatmap.
+        /// </summary>
+        public bool Favourited { get; }
+
+        /// <summary>
+        /// The number of favourites that the beatmap set has received, including the currently logged-in user.
+        /// </summary>
+        public int FavouriteCount { get; }
+
+        public BeatmapSetFavouriteState(bool favourited, int favouriteCount)
+        {
+            Favourited = favourited;
+            FavouriteCount = favouriteCount;
+        }
+    }
+}

osu.Game/Beatmaps/Drawables/Cards/Buttons/FavouriteButton.cs

@@ -2,7 +2,9 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.UserInterface;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Framework.Logging;
 using osu.Game.Online.API;
@@ -11,17 +13,24 @@ using osu.Game.Resources.Localisation.Web;
 
 namespace osu.Game.Beatmaps.Drawables.Cards.Buttons
 {
-    public class FavouriteButton : BeatmapCardIconButton
+    public class FavouriteButton : BeatmapCardIconButton, IHasCurrentValue<BeatmapSetFavouriteState>
     {
-        private readonly APIBeatmapSet beatmapSet;
+        private readonly BindableWithCurrent<BeatmapSetFavouriteState> current;
+
+        public Bindable<BeatmapSetFavouriteState> Current
+        {
+            get => current.Current;
+            set => current.Current = value;
+        }
+
+        private readonly int onlineBeatmapID;
 
         private PostBeatmapFavouriteRequest favouriteRequest;
 
         public FavouriteButton(APIBeatmapSet beatmapSet)
         {
-            this.beatmapSet = beatmapSet;
+            current = new BindableWithCurrent<BeatmapSetFavouriteState>(new BeatmapSetFavouriteState(beatmapSet.HasFavourited, beatmapSet.FavouriteCount));
-
+            onlineBeatmapID = beatmapSet.OnlineID;
-            updateState();
         }
 
         [BackgroundDependencyLoader]
@@ -29,17 +38,19 @@ namespace osu.Game.Beatmaps.Drawables.Cards.Buttons
         {
             Action = () =>
             {
-                var actionType = beatmapSet.HasFavourited ? BeatmapFavouriteAction.UnFavourite : BeatmapFavouriteAction.Favourite;
+                var actionType = current.Value.Favourited ? BeatmapFavouriteAction.UnFavourite : BeatmapFavouriteAction.Favourite;
 
                 favouriteRequest?.Cancel();
-                favouriteRequest = new PostBeatmapFavouriteRequest(beatmapSet.OnlineID, actionType);
+                favouriteRequest = new PostBeatmapFavouriteRequest(onlineBeatmapID, actionType);
 
                 Enabled.Value = false;
                 favouriteRequest.Success += () =>
                 {
-                    beatmapSet.HasFavourited = actionType == BeatmapFavouriteAction.Favourite;
+                    bool favourited = actionType == BeatmapFavouriteAction.Favourite;
+
+                    current.Value = new BeatmapSetFavouriteState(favourited, current.Value.FavouriteCount + (favourited ? 1 : -1));
+
                     Enabled.Value = true;
-                    updateState();
                 };
                 favouriteRequest.Failure += e =>
                 {
@@ -51,9 +62,15 @@ namespace osu.Game.Beatmaps.Drawables.Cards.Buttons
             };
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            current.BindValueChanged(_ => updateState(), true);
+        }
+
         private void updateState()
         {
-            if (beatmapSet.HasFavourited)
+            if (current.Value.Favourited)
             {
                 Icon.Icon = FontAwesome.Solid.Heart;
                 TooltipText = BeatmapsetsStrings.ShowDetailsUnfavourite;

osu.Game/Beatmaps/Drawables/Cards/Statistics/FavouritesStatistic.cs

@@ -2,8 +2,10 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using Humanizer;
+using osu.Framework.Bindables;
 using osu.Framework.Extensions.LocalisationExtensions;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.UserInterface;
 using osu.Game.Resources.Localisation.Web;
 
 namespace osu.Game.Beatmaps.Drawables.Cards.Statistics
@@ -11,13 +13,32 @@ namespace osu.Game.Beatmaps.Drawables.Cards.Statistics
     /// <summary>
     /// Shows the number of favourites that a beatmap set has received.
     /// </summary>
-    public class FavouritesStatistic : BeatmapCardStatistic
+    public class FavouritesStatistic : BeatmapCardStatistic, IHasCurrentValue<BeatmapSetFavouriteState>
     {
+        private readonly BindableWithCurrent<BeatmapSetFavouriteState> current;
+
+        public Bindable<BeatmapSetFavouriteState> Current
+        {
+            get => current.Current;
+            set => current.Current = value;
+        }
+
         public FavouritesStatistic(IBeatmapSetOnlineInfo onlineInfo)
         {
-            Icon = onlineInfo.HasFavourited ? FontAwesome.Solid.Heart : FontAwesome.Regular.Heart;
+            current = new BindableWithCurrent<BeatmapSetFavouriteState>(new BeatmapSetFavouriteState(onlineInfo.HasFavourited, onlineInfo.FavouriteCount));
-            Text = onlineInfo.FavouriteCount.ToMetric(decimals: 1);
+        }
-            TooltipText = BeatmapsStrings.PanelFavourites(onlineInfo.FavouriteCount.ToLocalisableString(@"N0"));
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            current.BindValueChanged(_ => updateState(), true);
+        }
+
+        private void updateState()
+        {
+            Icon = current.Value.Favourited ? FontAwesome.Solid.Heart : FontAwesome.Regular.Heart;
+            Text = current.Value.FavouriteCount.ToMetric(decimals: 1);
+            TooltipText = BeatmapsStrings.PanelFavourites(current.Value.FavouriteCount.ToLocalisableString(@"N0"));
         }
     }
 }