Add basic design settings to setup screen

osu.Game/Screens/Edit/Setup/DesignSection.cs

@@ -0,0 +1,58 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Localisation;
+using osu.Game.Graphics.UserInterfaceV2;
+
+namespace osu.Game.Screens.Edit.Setup
+{
+    internal class DesignSection : SetupSection
+    {
+        private LabelledSwitchButton widescreenSupport;
+        private LabelledSwitchButton epilepsyWarning;
+        private LabelledSwitchButton letterboxDuringBreaks;
+
+        public override LocalisableString Title => "Design";
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Children = new[]
+            {
+                widescreenSupport = new LabelledSwitchButton
+                {
+                    Label = "Widescreen support",
+                    Current = { Value = Beatmap.BeatmapInfo.WidescreenStoryboard }
+                },
+                epilepsyWarning = new LabelledSwitchButton
+                {
+                    Label = "Epilepsy warning",
+                    Description = "Setting this is recommended if the storyboard contains scenes with rapidly flashing colours.",
+                    Current = { Value = Beatmap.BeatmapInfo.EpilepsyWarning }
+                },
+                letterboxDuringBreaks = new LabelledSwitchButton
+                {
+                    Label = "Letterbox during breaks",
+                    Current = { Value = Beatmap.BeatmapInfo.LetterboxInBreaks }
+                }
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            widescreenSupport.Current.BindValueChanged(_ => updateBeatmap());
+            epilepsyWarning.Current.BindValueChanged(_ => updateBeatmap());
+            letterboxDuringBreaks.Current.BindValueChanged(_ => updateBeatmap());
+        }
+
+        private void updateBeatmap()
+        {
+            Beatmap.BeatmapInfo.WidescreenStoryboard = widescreenSupport.Current.Value;
+            Beatmap.BeatmapInfo.EpilepsyWarning = epilepsyWarning.Current.Value;
+            Beatmap.BeatmapInfo.LetterboxInBreaks = letterboxDuringBreaks.Current.Value;
+        }
+    }
+}