Add basic database setup for skins

osu.Game.Rulesets.Osu/Objects/Drawables/Pieces/ApproachCircle.cs

@@ -6,30 +6,24 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
+using osu.Game.Skinning;
 
 namespace osu.Game.Rulesets.Osu.Objects.Drawables.Pieces
 {
     public class ApproachCircle : Container
     {
-        private readonly Sprite approachCircle;
-
         public ApproachCircle()
         {
             Anchor = Anchor.Centre;
             Origin = Anchor.Centre;
 
-            AutoSizeAxes = Axes.Both;
-
-            Children = new Drawable[]
-            {
-                approachCircle = new Sprite()
-            };
+            RelativeSizeAxes = Axes.Both;
         }
 
         [BackgroundDependencyLoader]
         private void load(TextureStore textures)
         {
-            approachCircle.Texture = textures.Get(@"Play/osu/approachcircle");
+            Child = new SkinnableComponent("Play/osu/approachcircle", name => new Sprite { Texture = textures.Get(name) });
         }
     }
 }

osu.Game/OsuGameBase.cs

@@ -27,6 +27,7 @@ using osu.Game.Input.Bindings;
 using osu.Game.IO;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Scoring;
+using osu.Game.Skinning;
 
 namespace osu.Game
 {
@@ -95,6 +96,9 @@ namespace osu.Game
 
             dependencies.Cache(new LargeTextureStore(new RawTextureLoaderStore(new NamespacedResourceStore<byte[]>(Resources, @"Textures"))));
 
+            var skinManager = new SkinManager { CurrentSkin = { Value = new LegacySkin("Andromeda", Host.Storage) } };
+            dependencies.Cache(skinManager);
+
             dependencies.CacheAs(this);
             dependencies.Cache(LocalConfig);
 

osu.Game/Skinning/DefaultSkin.cs

@@ -0,0 +1,14 @@
+using osu.Framework.Graphics;
+
+namespace osu.Game.Skinning
+{
+    public class DefaultSkin : Skin
+    {
+        public DefaultSkin()
+            : base("Default")
+        {
+        }
+
+        public override Drawable GetComponent(string componentName) => null;
+    }
+}

osu.Game/Skinning/LegacySkin.cs

@@ -0,0 +1,38 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.IO.Stores;
+using osu.Framework.Platform;
+
+namespace osu.Game.Skinning
+{
+    public class LegacySkin : Skin
+    {
+        private readonly TextureStore textures;
+
+        public LegacySkin(string name, Storage storage)
+            : base(name)
+        {
+            textures = new TextureStore(new RawTextureLoaderStore(new StorageBackedResourceStore(storage.GetStorageForDirectory($"skins/{name}"))));
+        }
+
+        public override Drawable GetComponent(string componentName)
+        {
+            var legacyComponentName = componentName.Split('/').Last();
+
+            var texture = textures.Get(legacyComponentName);
+            if (texture == null) return null;
+
+            return new Sprite
+            {
+                RelativeSizeAxes = Axes.Both,
+                FillMode = FillMode.Fit,
+                Texture = textures.Get(legacyComponentName),
+            };
+        }
+    }
+}

osu.Game/Skinning/Skin.cs

@@ -0,0 +1,19 @@
+// 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.Graphics;
+
+namespace osu.Game.Skinning
+{
+    public abstract class Skin
+    {
+        public string Name { get; }
+
+        public abstract Drawable GetComponent(string componentName);
+
+        protected Skin(string name)
+        {
+            Name = name;
+        }
+    }
+}

osu.Game/Skinning/SkinManager.cs

@@ -0,0 +1,12 @@
+// 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.Configuration;
+
+namespace osu.Game.Skinning
+{
+    public class SkinManager
+    {
+        public Bindable<Skin> CurrentSkin = new Bindable<Skin>(new DefaultSkin());
+    }
+}

osu.Game/Skinning/SkinnableComponent.cs

@@ -0,0 +1,48 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Allocation;
+using osu.Framework.Configuration;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+
+namespace osu.Game.Skinning
+{
+    public class SkinnableComponent : SkinnableComponent<Drawable>
+    {
+        public SkinnableComponent(string name, Func<string,Drawable> defaultImplementation)
+            : base(name, defaultImplementation)
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+    }
+
+    public class SkinnableComponent<T> : CompositeDrawable
+        where T : Drawable
+    {
+        private Bindable<Skin> skin;
+        protected Func<string,T> CreateDefault;
+
+        public string ComponentName { get; set; }
+
+        public SkinnableComponent(string name, Func<string,T> defaultImplementation)
+        {
+            ComponentName = name;
+            CreateDefault = defaultImplementation;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(SkinManager skinManager)
+        {
+            skin = skinManager.CurrentSkin.GetBoundCopy();
+            skin.ValueChanged += updateComponent;
+            skin.TriggerChange();
+        }
+
+        private void updateComponent(Skin skin)
+        {
+            InternalChild = skin.GetComponent(ComponentName) ?? CreateDefault(Name);
+        }
+    }
+}

osu.Game/osu.Game.csproj

@@ -843,6 +843,11 @@
     <Compile Include="Screens\Tournament\Teams\DrawingsTeam.cs" />
     <Compile Include="Screens\Tournament\Teams\ITeamList.cs" />
     <Compile Include="Screens\Tournament\Teams\StorageBackedTeamList.cs" />
+    <Compile Include="Skinning\DefaultSkin.cs" />
+    <Compile Include="Skinning\LegacySkin.cs" />
+    <Compile Include="Skinning\Skin.cs" />
+    <Compile Include="Skinning\SkinManager.cs" />
+    <Compile Include="Skinning\SkinnableComponent.cs" />
     <Compile Include="Storyboards\CommandLoop.cs" />
     <Compile Include="Storyboards\CommandTimeline.cs" />
     <Compile Include="Storyboards\CommandTimelineGroup.cs" />