Add neighboring builds handling;

+ provoke angry AppVeyor

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

@@ -7,14 +7,16 @@ namespace osu.Game.Online.API.Requests
 {
     public class GetChangelogBuildRequest : APIRequest<APIChangelog>
     {
-        private string url;
-        /// <param name="url">This will need to be changed to "long Id"
-        /// Placeholder for testing</param>
-        GetChangelogBuildRequest(string url)
+        private readonly string name;
+        private readonly string version;
+
+        public GetChangelogBuildRequest(string streamName, string buildVersion)
         {
-            this.url = url;
+            name = streamName;
+            version = buildVersion;
         }
-        protected override string Uri => @"";
-        protected override string Target => url;
+
+        //protected override string Target => $@"changelog/{name}/{version}";
+        protected override string Uri => @"https://api.myjson.com/bins/ya5q2"; // for testing
     }
 }

osu.Game/Overlays/Changelog/ChangelogContent.cs

@@ -1,13 +1,20 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
+using osu.Game.Online.API.Requests.Responses;
 
 namespace osu.Game.Overlays.Changelog
 {
     public class ChangelogContent : FillFlowContainer<ChangelogContentGroup>
     {
+        private APIChangelog currentBuild;
+        private APIAccess api;
+
         public ChangelogContent()
         {
             RelativeSizeAxes = Axes.X;
@@ -19,5 +26,52 @@ namespace osu.Game.Overlays.Changelog
                 Right = 70,
             };
         }
+
+        public override void Add(ChangelogContentGroup changelogContentGroup)
+        {
+            changelogContentGroup.PreviousRequested = ShowPrevious;
+            changelogContentGroup.NextRequested = ShowNext;
+            base.Add(changelogContentGroup);
+        }
+
+        public void ShowBuild(APIChangelog changelog)
+        {
+            Clear();
+            Add(new ChangelogContentGroup(changelog));
+            FetchChangelogBuild(changelog);
+        }
+
+        private void ShowNext()
+        {
+            if (currentBuild.Versions.Next != null)
+            {
+                Clear();
+                Add(new ChangelogContentGroup(currentBuild.Versions.Next));
+                FetchChangelogBuild(currentBuild.Versions.Next);
+            }
+        }
+
+        private void ShowPrevious()
+        {
+            if (currentBuild.Versions.Previous != null)
+            {
+                Clear();
+                Add(new ChangelogContentGroup(currentBuild.Versions.Previous));
+                FetchChangelogBuild(currentBuild.Versions.Previous);
+            }
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(APIAccess api)
+        {
+            this.api = api;
+        }
+
+        private void FetchChangelogBuild(APIChangelog build)
+        {
+            var req = new GetChangelogBuildRequest(build.UpdateStream.Name, build.Version);
+            req.Success += res => currentBuild = res;
+            api.Queue(req);
+        }
     }
 }

osu.Game/Overlays/Changelog/ChangelogContentGroup.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Overlays.Changelog
                             Icon = FontAwesome.fa_chevron_left,
                             Size = new Vector2(24),
                             TooltipText = "Previous",
-                            OnPressed = PreviousRequested,
+                            OnPressed = () => PreviousRequested(),
                         },
                         new FillFlowContainer<SpriteText>
                         {
@@ -84,7 +84,7 @@ namespace osu.Game.Overlays.Changelog
                             Icon = FontAwesome.fa_chevron_right,
                             Size = new Vector2(24),
                             TooltipText = "Next",
-                            OnPressed = NextRequested,
+                            OnPressed = () => NextRequested(),
                         },
                     }
                 },

osu.Game/Overlays/Changelog/StreamBadge.cs

@@ -64,7 +64,7 @@ namespace osu.Game.Overlays.Changelog
                         new SpriteText
                         {
                             Text = ChangelogEntry.Users > 0 ?
-                                string.Format($"{ChangelogEntry.Users:N0} users online") :
+                                $"{ChangelogEntry.Users:N0} users online" :
                                 null,
                             TextSize = 12,
                             Font = @"Exo2.0-Regular",

osu.Game/Overlays/ChangelogOverlay.cs

@@ -87,8 +87,7 @@ namespace osu.Game.Overlays
                     header.ChangelogEntry = Streams.SelectedRelease;
                 }
                 header.ShowReleaseStream();
-                content.Clear(); // this should probably happen with some transition
-                content.Add(new ChangelogContentGroup(Streams.SelectedRelease));
+                content.ShowBuild(Streams.SelectedRelease);
             };
             header.OnListingActivated += () =>
             {