Add tablet rotation configuration

osu.Game/Overlays/Settings/Sections/Input/RotationPresetButtons.cs

@@ -0,0 +1,109 @@
+// 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 System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Input.Handlers.Tablet;
+using osu.Game.Graphics;
+using osu.Game.Graphics.UserInterface;
+
+namespace osu.Game.Overlays.Settings.Sections.Input
+{
+    internal class RotationPresetButtons : FillFlowContainer
+    {
+        private readonly ITabletHandler tabletHandler;
+
+        private Bindable<float> rotation;
+
+        private const int height = 50;
+
+        public RotationPresetButtons(ITabletHandler tabletHandler)
+        {
+            this.tabletHandler = tabletHandler;
+
+            RelativeSizeAxes = Axes.X;
+            Height = height;
+
+            for (int i = 0; i < 360; i += 90)
+            {
+                var presetRotation = i;
+
+                Add(new RotationButton(i)
+                {
+                    RelativeSizeAxes = Axes.X,
+                    Height = height,
+                    Width = 0.25f,
+                    Text = $"{presetRotation}º",
+                    Action = () => tabletHandler.Rotation.Value = presetRotation,
+                });
+            }
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            rotation = tabletHandler.Rotation.GetBoundCopy();
+            rotation.BindValueChanged(val =>
+            {
+                foreach (var b in Children.OfType<RotationButton>())
+                    b.IsSelected = b.Preset == val.NewValue;
+            }, true);
+        }
+
+        public class RotationButton : TriangleButton
+        {
+            [Resolved]
+            private OsuColour colours { get; set; }
+
+            public readonly int Preset;
+
+            public RotationButton(int preset)
+            {
+                Preset = preset;
+            }
+
+            private bool isSelected;
+
+            public bool IsSelected
+            {
+                get => isSelected;
+                set
+                {
+                    if (value == isSelected)
+                        return;
+
+                    isSelected = value;
+
+                    if (IsLoaded)
+                        updateColour();
+                }
+            }
+
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
+                updateColour();
+            }
+
+            private void updateColour()
+            {
+                if (isSelected)
+                {
+                    BackgroundColour = colours.BlueDark;
+                    Triangles.ColourDark = colours.BlueDarker;
+                    Triangles.ColourLight = colours.Blue;
+                }
+                else
+                {
+                    BackgroundColour = colours.Gray4;
+                    Triangles.ColourDark = colours.Gray5;
+                    Triangles.ColourLight = colours.Gray6;
+                }
+            }
+        }
+    }
+}

osu.Game/Overlays/Settings/Sections/Input/TabletSettings.cs

@@ -129,6 +129,7 @@ namespace osu.Game.Overlays.Settings.Sections.Input
                             LabelText = "Rotation",
                             Current = rotation
                         },
+                        new RotationPresetButtons(tabletHandler),
                         new SettingsSlider<float>
                         {
                             TransferValueOnCommit = true,