Added beatmap delete dialog

osu.Game/Screens/Select/BeatmapDeleteDialog.cs

@@ -0,0 +1,53 @@
+// 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;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics;
+using osu.Game.Overlays.Dialog;
+
+namespace osu.Game
+{
+    public class BeatmapDeleteDialog : PopupDialog
+    {
+        public Action<WorkingBeatmap> OnDelete;
+
+        private WorkingBeatmap beatmap;
+        public WorkingBeatmap Beatmap
+        {
+            get
+            {
+                return beatmap;
+            }
+            set
+            {
+                beatmap = value;
+                BodyText = $@"{beatmap?.Beatmap?.Metadata?.Artist} - {beatmap?.Beatmap?.Metadata?.Title}";
+            }
+        }
+
+        public BeatmapDeleteDialog()
+        {
+            Icon = FontAwesome.fa_trash_o;
+            HeaderText = @"Confirm deletion of";
+            Buttons = new PopupDialogButton[]
+            {
+                new PopupDialogOkButton
+                {
+                    Text = @"Yes. Totally. Delete it.",
+                    Action = () =>
+                    {
+                        if (Beatmap != null)
+                        {
+                            OnDelete?.Invoke(Beatmap);
+                        }
+                    },
+                },
+                new PopupDialogCancelButton
+                {
+                    Text = @"Firetruck, I didn't mean to!",
+                },
+            };
+        }
+    }
+}