+BeatmapOnlineInfo, +OnlineWorkingBeatmap, minor cleanups, panel beatmap backgrounds

osu.Game/Database/OnlineWorkingBeatmap.cs

@@ -0,0 +1,37 @@
+// Copyright (c) 2007-2017 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.Audio.Track;
+using osu.Framework.Graphics.Textures;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Database
+{
+    internal class OnlineWorkingBeatmap : WorkingBeatmap
+	{
+        private TextureStore textures;
+        private TrackManager tracks;
+
+        public OnlineWorkingBeatmap(BeatmapInfo beatmapInfo, TextureStore textures, TrackManager tracks) : base(beatmapInfo)
+        {
+            this.textures = textures;
+            this.tracks = tracks;
+        }
+
+        protected override Beatmap GetBeatmap()
+        {
+            return new Beatmap();
+        }
+
+        protected override Texture GetBackground()
+        {
+            return textures.Get(BeatmapInfo.OnlineInfo.Covers.FirstOrDefault());
+        }
+
+        protected override Track GetTrack()
+        {
+            return tracks.Get(BeatmapInfo.OnlineInfo.Preview);
+        }
+    }
+}