added confirmation dialog for Delete ALL beatmaps

osu.Game/Overlays/Settings/Sections/Maintenance/DeleteAllBeatmapsDialog.cs

@@ -0,0 +1,46 @@
+// 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 System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using osu.Framework.Allocation;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics;
+using osu.Game.Overlays.Dialog;
+
+namespace osu.Game.Overlays.Settings.Sections.Maintenance
+{
+    public class DeleteAllBeatmapsDialog : PopupDialog
+    {
+        private BeatmapManager manager;
+
+        [BackgroundDependencyLoader]
+        private void load(BeatmapManager beatmapManager)
+        {
+            manager = beatmapManager;
+        }
+
+        public DeleteAllBeatmapsDialog(Action deleteAction)
+        {
+            BodyText = "Everything?";
+
+            Icon = FontAwesome.fa_trash_o;
+            HeaderText = @"Confirm deletion of";
+            Buttons = new PopupDialogButton[]
+            {
+                new PopupDialogOkButton
+                {
+                    Text = @"Yes. Go for it.",
+                    Action = deleteAction
+                },
+                new PopupDialogCancelButton
+                {
+                    Text = @"No! Abort mission!",
+                },
+            };
+        }
+    }
+}

osu.Game/Overlays/Settings/Sections/Maintenance/GeneralSettings.cs

@@ -1,6 +1,7 @@
 // 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 System.Linq;
 using System.Threading.Tasks;
 using osu.Framework.Allocation;
@@ -16,11 +17,15 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
         private TriangleButton deleteButton;
         private TriangleButton restoreButton;
 
+        private DialogOverlay dialogOverlay;
+
         protected override string Header => "General";
 
         [BackgroundDependencyLoader]
-        private void load(BeatmapManager beatmaps)
+        private void load(BeatmapManager beatmaps, DialogOverlay dialog)
         {
+            dialogOverlay = dialog;
+
             Children = new Drawable[]
             {
                 importButton = new SettingsButton
@@ -37,9 +42,13 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
                 {
                     Text = "Delete ALL beatmaps",
                     Action = () =>
+                    {
+                        Action deletion = delegate
                         {
                             deleteButton.Enabled.Value = false;
                             Task.Run(() => beatmaps.DeleteAll()).ContinueWith(t => Schedule(() => deleteButton.Enabled.Value = true));
+                        };
+                        dialogOverlay?.Push(new DeleteAllBeatmapsDialog(deletion));
                     }
                 },
                 restoreButton = new SettingsButton

osu.Game/osu.Game.csproj

@@ -300,6 +300,7 @@
     <Compile Include="Overlays\Profile\Sections\Ranks\PaginatedScoreContainer.cs" />
     <Compile Include="Overlays\Profile\Sections\Ranks\DrawableTotalScore.cs" />
     <Compile Include="Overlays\Profile\Sections\Ranks\ScoreModsContainer.cs" />
+    <Compile Include="Overlays\Settings\Sections\Maintenance\DeleteAllBeatmapsDialog.cs" />
     <Compile Include="Overlays\Settings\SettingsButton.cs" />
     <Compile Include="Screens\Edit\Components\BottomBarContainer.cs" />
     <Compile Include="Screens\Edit\Components\PlaybackControl.cs" />