Merge remote-tracking branch 'upstream/master' into scoredatabase

osu.Game/Beatmaps/BeatmapManager.cs

@@ -63,6 +63,8 @@ public partial class BeatmapManager : ArchiveModelManager<BeatmapSetInfo, Beatma
 
         public override string[] HandledExtensions => new[] { ".osz" };
 
+        protected override string[] HashableFileTypes => new[] { ".osu" };
+
         protected override string ImportFromStablePath => "Songs";
 
         private readonly RulesetStore rulesets;
@@ -129,19 +131,6 @@ private void validateOnlineIds(List<BeatmapInfo> beatmaps)
                 beatmaps.ForEach(b => b.OnlineBeatmapID = null);
         }
 
-        protected override BeatmapSetInfo CheckForExisting(BeatmapSetInfo model)
-        {
-            // check if this beatmap has already been imported and exit early if so
-            var existingHashMatch = beatmaps.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
-            if (existingHashMatch != null)
-            {
-                Undelete(existingHashMatch);
-                return existingHashMatch;
-            }
-
-            return null;
-        }
-
         /// <summary>
         /// Downloads a beatmap.
         /// This will post notifications tracking progress.
@@ -317,20 +306,6 @@ public WorkingBeatmap GetWorkingBeatmap(BeatmapInfo beatmapInfo, WorkingBeatmap
         /// <returns>Results from the provided query.</returns>
         public IQueryable<BeatmapInfo> QueryBeatmaps(Expression<Func<BeatmapInfo, bool>> query) => beatmaps.Beatmaps.AsNoTracking().Where(query);
 
-        /// <summary>
-        /// Create a SHA-2 hash from the provided archive based on contained beatmap (.osu) file content.
-        /// </summary>
-        private string computeBeatmapSetHash(ArchiveReader reader)
-        {
-            // for now, concatenate all .osu files in the set to create a unique hash.
-            MemoryStream hashable = new MemoryStream();
-            foreach (string file in reader.Filenames.Where(f => f.EndsWith(".osu")))
-                using (Stream s = reader.GetStream(file))
-                    s.CopyTo(hashable);
-
-            return hashable.ComputeSHA2Hash();
-        }
-
         protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
         {
             // let's make sure there are actually .osu files to import.
@@ -349,7 +324,6 @@ protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
             {
                 OnlineBeatmapSetID = beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID,
                 Beatmaps = new List<BeatmapInfo>(),
-                Hash = computeBeatmapSetHash(reader),
                 Metadata = beatmap.Metadata,
             };
         }

osu.Game/Database/ArchiveModelManager.cs

@@ -8,6 +8,7 @@
 using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Microsoft.EntityFrameworkCore;
+using osu.Framework.Extensions;
 using osu.Framework.IO.File;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
@@ -205,7 +206,12 @@ public TModel Import(ArchiveReader archive)
             try
             {
                 var model = CreateModel(archive);
-                return model == null ? null : Import(model, archive);
+
+                if (model == null) return null;
+
+                model.Hash = computeHash(archive);
+
+                return Import(model, archive);
             }
             catch (Exception e)
             {
@@ -214,6 +220,27 @@ public TModel Import(ArchiveReader archive)
             }
         }
 
+        /// <summary>
+        /// Any file extensions which should be included in hash creation.
+        /// Generally should include all file types which determine the file's uniqueness.
+        /// Large files should be avoided if possible.
+        /// </summary>
+        protected abstract string[] HashableFileTypes { get; }
+
+        /// <summary>
+        /// Create a SHA-2 hash from the provided archive based on file content of all files matching <see cref="HashableFileTypes"/>.
+        /// </summary>
+        private string computeHash(ArchiveReader reader)
+        {
+            // for now, concatenate all .osu files in the set to create a unique hash.
+            MemoryStream hashable = new MemoryStream();
+            foreach (string file in reader.Filenames.Where(f => HashableFileTypes.Any(f.EndsWith)))
+                using (Stream s = reader.GetStream(file))
+                    s.CopyTo(hashable);
+
+            return hashable.ComputeSHA2Hash();
+        }
+
         /// <summary>
         /// Import an item from a <see cref="TModel"/>.
         /// </summary>
@@ -237,6 +264,7 @@ public TModel Import(TModel item, ArchiveReader archive = null)
 
                         if (existing != null)
                         {
+                            Undelete(existing);
                             Logger.Log($"Found existing {typeof(TModel)} for {item} (ID {existing.ID}). Skipping import.", LoggingTarget.Database);
                             handleEvent(() => ItemAdded?.Invoke(existing, true));
                             return existing;
@@ -474,7 +502,12 @@ protected virtual void Populate(TModel model, [CanBeNull] ArchiveReader archive)
         {
         }
 
-        protected virtual TModel CheckForExisting(TModel model) => null;
+        /// <summary>
+        /// Check whether an existing model already exists for a new import item.
+        /// </summary>
+        /// <param name="model">The new model proposed for import. Note that <see cref="Populate"/> has not yet been run on this model.</param>
+        /// <returns>An existing model which matches the criteria to skip importing, else null.</returns>
+        protected virtual TModel CheckForExisting(TModel model) => ModelStore.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
 
         private DbSet<TModel> queryModel() => ContextFactory.Get().Set<TModel>();
 

osu.Game/Database/IHasFiles.cs

@@ -13,5 +13,7 @@ public interface IHasFiles<TFile>
         where TFile : INamedFileInfo
     {
         List<TFile> Files { get; set; }
+
+        string Hash { get; set; }
     }
 }

osu.Game/Database/OsuDbContext.cs

@@ -107,6 +107,9 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
             modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.DeletePending);
             modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.Hash).IsUnique();
 
+            modelBuilder.Entity<SkinInfo>().HasIndex(b => b.Hash).IsUnique();
+            modelBuilder.Entity<SkinInfo>().HasIndex(b => b.DeletePending);
+
             modelBuilder.Entity<DatabasedKeyBinding>().HasIndex(b => new { b.RulesetID, b.Variant });
             modelBuilder.Entity<DatabasedKeyBinding>().HasIndex(b => b.IntAction);
 

osu.Game/Migrations/20181128100659_AddSkinInfoHash.Designer.cs

@@ -0,0 +1,387 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using osu.Game.Database;
+
+namespace osu.Game.Migrations
+{
+    [DbContext(typeof(OsuDbContext))]
+    [Migration("20181128100659_AddSkinInfoHash")]
+    partial class AddSkinInfoHash
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "2.1.4-rtm-31024");
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapDifficulty", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<float>("ApproachRate");
+
+                    b.Property<float>("CircleSize");
+
+                    b.Property<float>("DrainRate");
+
+                    b.Property<float>("OverallDifficulty");
+
+                    b.Property<double>("SliderMultiplier");
+
+                    b.Property<double>("SliderTickRate");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapDifficulty");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("AudioLeadIn");
+
+                    b.Property<int>("BaseDifficultyID");
+
+                    b.Property<int>("BeatDivisor");
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<bool>("Countdown");
+
+                    b.Property<double>("DistanceSpacing");
+
+                    b.Property<int>("GridSize");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<bool>("Hidden");
+
+                    b.Property<bool>("LetterboxInBreaks");
+
+                    b.Property<string>("MD5Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapID");
+
+                    b.Property<string>("Path");
+
+                    b.Property<int>("RulesetID");
+
+                    b.Property<bool>("SpecialStyle");
+
+                    b.Property<float>("StackLeniency");
+
+                    b.Property<double>("StarDifficulty");
+
+                    b.Property<int>("Status");
+
+                    b.Property<string>("StoredBookmarks");
+
+                    b.Property<double>("TimelineZoom");
+
+                    b.Property<string>("Version");
+
+                    b.Property<bool>("WidescreenStoryboard");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BaseDifficultyID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("Hash");
+
+                    b.HasIndex("MD5Hash");
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapID")
+                        .IsUnique();
+
+                    b.HasIndex("RulesetID");
+
+                    b.ToTable("BeatmapInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapMetadata", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Artist");
+
+                    b.Property<string>("ArtistUnicode");
+
+                    b.Property<string>("AudioFile");
+
+                    b.Property<string>("AuthorString")
+                        .HasColumnName("Author");
+
+                    b.Property<string>("BackgroundFile");
+
+                    b.Property<int>("PreviewTime");
+
+                    b.Property<string>("Source");
+
+                    b.Property<string>("Tags");
+
+                    b.Property<string>("Title");
+
+                    b.Property<string>("TitleUnicode");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapMetadata");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.ToTable("BeatmapSetFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapSetID");
+
+                    b.Property<bool>("Protected");
+
+                    b.Property<int>("Status");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapSetID")
+                        .IsUnique();
+
+                    b.ToTable("BeatmapSetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Configuration.DatabasedSetting", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("IntKey")
+                        .HasColumnName("Key");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<string>("StringValue")
+                        .HasColumnName("Value");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("Settings");
+                });
+
+            modelBuilder.Entity("osu.Game.Input.Bindings.DatabasedKeyBinding", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("IntAction")
+                        .HasColumnName("Action");
+
+                    b.Property<string>("KeysString")
+                        .HasColumnName("Keys");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("IntAction");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("KeyBinding");
+                });
+
+            modelBuilder.Entity("osu.Game.IO.FileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int>("ReferenceCount");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("ReferenceCount");
+
+                    b.ToTable("FileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Rulesets.RulesetInfo", b =>
+                {
+                    b.Property<int?>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<bool>("Available");
+
+                    b.Property<string>("InstantiationInfo");
+
+                    b.Property<string>("Name");
+
+                    b.Property<string>("ShortName");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Available");
+
+                    b.HasIndex("ShortName")
+                        .IsUnique();
+
+                    b.ToTable("RulesetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.Property<int>("SkinInfoID");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.HasIndex("SkinInfoID");
+
+                    b.ToTable("SkinFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Creator");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<string>("Name");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.ToTable("SkinInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapDifficulty", "BaseDifficulty")
+                        .WithMany()
+                        .HasForeignKey("BaseDifficultyID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo", "BeatmapSet")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("MetadataID");
+
+                    b.HasOne("osu.Game.Rulesets.RulesetInfo", "Ruleset")
+                        .WithMany()
+                        .HasForeignKey("RulesetID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("BeatmapSets")
+                        .HasForeignKey("MetadataID");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Skinning.SkinInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("SkinInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

osu.Game/Migrations/20181128100659_AddSkinInfoHash.cs

@@ -0,0 +1,41 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace osu.Game.Migrations
+{
+    public partial class AddSkinInfoHash : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Hash",
+                table: "SkinInfo",
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SkinInfo_DeletePending",
+                table: "SkinInfo",
+                column: "DeletePending");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SkinInfo_Hash",
+                table: "SkinInfo",
+                column: "Hash",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_SkinInfo_DeletePending",
+                table: "SkinInfo");
+
+            migrationBuilder.DropIndex(
+                name: "IX_SkinInfo_Hash",
+                table: "SkinInfo");
+
+            migrationBuilder.DropColumn(
+                name: "Hash",
+                table: "SkinInfo");
+        }
+    }
+}

osu.Game/Migrations/OsuDbContextModelSnapshot.cs

@@ -384,10 +384,17 @@ protected override void BuildModel(ModelBuilder modelBuilder)
 
                     b.Property<bool>("DeletePending");
 
+                    b.Property<string>("Hash");
+
                     b.Property<string>("Name");
 
                     b.HasKey("ID");
 
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
                     b.ToTable("SkinInfo");
                 });
 

osu.Game/Screens/Edit/Components/PlaybackControl.cs

@@ -13,6 +13,7 @@
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Graphics.UserInterface;
+using osuTK.Input;
 
 namespace osu.Game.Screens.Edit.Components
 {
@@ -63,6 +64,18 @@ private void load(IAdjustableClock adjustableClock)
             tabs.Current.ValueChanged += newValue => Beatmap.Value.Track.Tempo.Value = newValue;
         }
 
+        protected override bool OnKeyDown(KeyDownEvent e)
+        {
+            switch (e.Key)
+            {
+                case Key.Space:
+                    togglePause();
+                    return true;
+            }
+
+            return base.OnKeyDown(e);
+        }
+
         private void togglePause()
         {
             if (adjustableClock.IsRunning)

osu.Game/Screens/Edit/Editor.cs

@@ -20,6 +20,7 @@
 using osu.Game.Screens.Edit.Components.Menus;
 using osu.Game.Screens.Edit.Compose;
 using osu.Game.Screens.Edit.Design;
+using osuTK.Input;
 
 namespace osu.Game.Screens.Edit
 {
@@ -157,29 +158,19 @@ private void load(OsuColour colours, GameHost host)
             bottomBackground.Colour = colours.Gray2;
         }
 
-        private void exportBeatmap()
+        protected override bool OnKeyDown(KeyDownEvent e)
         {
-            host.OpenFileExternally(Beatmap.Value.Save());
-        }
-
-        private void onModeChanged(EditorScreenMode mode)
-        {
-            currentScreen?.Exit();
-
-            switch (mode)
+            switch (e.Key)
             {
-                case EditorScreenMode.Compose:
-                    currentScreen = new ComposeScreen();
-                    break;
-                case EditorScreenMode.Design:
-                    currentScreen = new DesignScreen();
-                    break;
-                default:
-                    currentScreen = new EditorScreen();
-                    break;
+                case Key.Left:
+                    seek(e, -1);
+                    return true;
+                case Key.Right:
+                    seek(e, 1);
+                    return true;
             }
 
-            LoadComponentAsync(currentScreen, screenContainer.Add);
+            return base.OnKeyDown(e);
         }
 
         private double scrollAccumulation;
@@ -193,9 +184,9 @@ protected override bool OnScroll(ScrollEvent e)
             while (Math.Abs(scrollAccumulation) > precision)
             {
                 if (scrollAccumulation > 0)
-                    clock.SeekBackward(!clock.IsRunning);
+                    seek(e, -1);
                 else
-                    clock.SeekForward(!clock.IsRunning);
+                    seek(e, 1);
 
                 scrollAccumulation = scrollAccumulation < 0 ? Math.Min(0, scrollAccumulation + precision) : Math.Max(0, scrollAccumulation - precision);
             }
@@ -224,7 +215,40 @@ protected override bool OnExiting(Screen next)
                 Beatmap.Value.Track.Tempo.Value = 1;
                 Beatmap.Value.Track.Start();
             }
+
             return base.OnExiting(next);
         }
+
+        private void exportBeatmap() => host.OpenFileExternally(Beatmap.Value.Save());
+
+        private void onModeChanged(EditorScreenMode mode)
+        {
+            currentScreen?.Exit();
+
+            switch (mode)
+            {
+                case EditorScreenMode.Compose:
+                    currentScreen = new ComposeScreen();
+                    break;
+                case EditorScreenMode.Design:
+                    currentScreen = new DesignScreen();
+                    break;
+                default:
+                    currentScreen = new EditorScreen();
+                    break;
+            }
+
+            LoadComponentAsync(currentScreen, screenContainer.Add);
+        }
+
+        private void seek(UIEvent e, int direction)
+        {
+            double amount = e.ShiftPressed ? 2 : 1;
+
+            if (direction < 1)
+                clock.SeekBackward(!clock.IsRunning, amount);
+            else
+                clock.SeekForward(!clock.IsRunning, amount);
+        }
     }
 }

osu.Game/Screens/Edit/EditorClock.cs

@@ -68,16 +68,20 @@ public bool SeekSnapped(double position)
         /// Seeks backwards by one beat length.
         /// </summary>
         /// <param name="snapped">Whether to snap to the closest beat after seeking.</param>
-        public void SeekBackward(bool snapped = false) => seek(-1, snapped);
+        /// <param name="amount">The relative amount (magnitude) which should be seeked.</param>
+        public void SeekBackward(bool snapped = false, double amount = 1) => seek(-1, snapped, amount);
 
         /// <summary>
         /// Seeks forwards by one beat length.
         /// </summary>
         /// <param name="snapped">Whether to snap to the closest beat after seeking.</param>
-        public void SeekForward(bool snapped = false) => seek(1, snapped);
+        /// <param name="amount">The relative amount (magnitude) which should be seeked.</param>
+        public void SeekForward(bool snapped = false, double amount = 1) => seek(1, snapped, amount);
 
-        private void seek(int direction, bool snapped)
+        private void seek(int direction, bool snapped, double amount = 1)
         {
+            if (amount <= 0) throw new ArgumentException("Value should be greater than zero", nameof(amount));
+
             var timingPoint = ControlPointInfo.TimingPointAt(CurrentTime);
             if (direction < 0 && timingPoint.Time == CurrentTime)
             {
@@ -87,7 +91,7 @@ private void seek(int direction, bool snapped)
                     timingPoint = ControlPointInfo.TimingPoints[--activeIndex];
             }
 
-            double seekAmount = timingPoint.BeatLength / beatDivisor;
+            double seekAmount = timingPoint.BeatLength / beatDivisor * amount;
             double seekTime = CurrentTime + seekAmount * direction;
 
             if (!snapped || ControlPointInfo.TimingPoints.Count == 0)

osu.Game/Skinning/SkinInfo.cs

@@ -13,16 +13,20 @@ public class SkinInfo : IHasFiles<SkinFileInfo>, IEquatable<SkinInfo>, IHasPrima
 
         public string Name { get; set; }
 
+        public string Hash { get; set; }
+
         public string Creator { get; set; }
 
         public List<SkinFileInfo> Files { get; set; }
 
         public bool DeletePending { get; set; }
 
+        public string FullName => $"\"{Name}\" by {Creator}";
+
         public static SkinInfo Default { get; } = new SkinInfo { Name = "osu!lazer", Creator = "team osu!" };
 
         public bool Equals(SkinInfo other) => other != null && ID == other.ID;
 
-        public override string ToString() => $"\"{Name}\" by {Creator}";
+        public override string ToString() => FullName;
     }
 }

osu.Game/Skinning/SkinManager.cs

@@ -26,8 +26,32 @@ public class SkinManager : ArchiveModelManager<SkinInfo, SkinFileInfo>, ISkinSou
 
         public override string[] HandledExtensions => new[] { ".osk" };
 
+        protected override string[] HashableFileTypes => new[] { ".ini" };
+
         protected override string ImportFromStablePath => "Skins";
 
+        public SkinManager(Storage storage, DatabaseContextFactory contextFactory, IIpcHost importHost, AudioManager audio)
+            : base(storage, contextFactory, new SkinStore(contextFactory, storage), importHost)
+        {
+            this.audio = audio;
+
+            ItemRemoved += removedInfo =>
+            {
+                // check the removed skin is not the current user choice. if it is, switch back to default.
+                if (removedInfo.ID == CurrentSkinInfo.Value.ID)
+                    CurrentSkinInfo.Value = SkinInfo.Default;
+            };
+
+            CurrentSkinInfo.ValueChanged += info => CurrentSkin.Value = getSkin(info);
+            CurrentSkin.ValueChanged += skin =>
+            {
+                if (skin.SkinInfo != CurrentSkinInfo.Value)
+                    throw new InvalidOperationException($"Setting {nameof(CurrentSkin)}'s value directly is not supported. Use {nameof(CurrentSkinInfo)} instead.");
+
+                SourceChanged?.Invoke();
+            };
+        }
+
         /// <summary>
         /// Returns a list of all usable <see cref="SkinInfo"/>s. Includes the special default skin plus all skins from <see cref="GetAllUserSkins"/>.
         /// </summary>
@@ -45,24 +69,13 @@ public List<SkinInfo> GetAllUsableSkins()
         /// <returns>A list of available <see cref="SkinInfo"/>.</returns>
         public List<SkinInfo> GetAllUserSkins() => ModelStore.ConsumableItems.Where(s => !s.DeletePending).ToList();
 
-        protected override SkinInfo CreateModel(ArchiveReader archive) => new SkinInfo
-        {
-            Name = archive.Name
-        };
+        protected override SkinInfo CreateModel(ArchiveReader archive) => new SkinInfo { Name = archive.Name };
 
         protected override void Populate(SkinInfo model, ArchiveReader archive)
         {
             base.Populate(model, archive);
-            populate(model);
-        }
 
-        /// <summary>
-        /// Populate a <see cref="SkinInfo"/> from its <see cref="SkinConfiguration"/> (if possible).
-        /// </summary>
-        /// <param name="model"></param>
-        private void populate(SkinInfo model)
-        {
-            Skin reference = GetSkin(model);
+            Skin reference = getSkin(model);
             if (!string.IsNullOrEmpty(reference.Configuration.SkinInfo.Name))
             {
                 model.Name = reference.Configuration.SkinInfo.Name;
@@ -80,7 +93,7 @@ private void populate(SkinInfo model)
         /// </summary>
         /// <param name="skinInfo">The skin to lookup.</param>
         /// <returns>A <see cref="Skin"/> instance correlating to the provided <see cref="SkinInfo"/>.</returns>
-        public Skin GetSkin(SkinInfo skinInfo)
+        private Skin getSkin(SkinInfo skinInfo)
         {
             if (skinInfo == SkinInfo.Default)
                 return new DefaultSkin();
@@ -88,28 +101,6 @@ public Skin GetSkin(SkinInfo skinInfo)
             return new LegacySkin(skinInfo, Files.Store, audio);
         }
 
-        public SkinManager(Storage storage, DatabaseContextFactory contextFactory, IIpcHost importHost, AudioManager audio)
-            : base(storage, contextFactory, new SkinStore(contextFactory, storage), importHost)
-        {
-            this.audio = audio;
-
-            ItemRemoved += removedInfo =>
-            {
-                // check the removed skin is not the current user choice. if it is, switch back to default.
-                if (removedInfo.ID == CurrentSkinInfo.Value.ID)
-                    CurrentSkinInfo.Value = SkinInfo.Default;
-            };
-
-            CurrentSkinInfo.ValueChanged += info => CurrentSkin.Value = GetSkin(info);
-            CurrentSkin.ValueChanged += skin =>
-            {
-                if (skin.SkinInfo != CurrentSkinInfo.Value)
-                    throw new InvalidOperationException($"Setting {nameof(CurrentSkin)}'s value directly is not supported. Use {nameof(CurrentSkinInfo)} instead.");
-
-                SourceChanged?.Invoke();
-            };
-        }
-
         /// <summary>
         /// Perform a lookup query on available <see cref="SkinInfo"/>s.
         /// </summary>