Add rounded button variant

osu.Game.Tests/Visual/UserInterface/TestSceneRoundedButton.cs

@@ -0,0 +1,44 @@
+// 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;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics.UserInterfaceV2;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneRoundedButton : OsuTestScene
+    {
+        [Test]
+        public void TestBasic()
+        {
+            RoundedButton button = null;
+
+            AddStep("create button", () => Child = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Children = new Drawable[]
+                {
+                    new Box
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Colour = Colour4.DarkGray
+                    },
+                    button = new RoundedButton
+                    {
+                        Width = 400,
+                        Text = "Test button",
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                        Action = () => { }
+                    }
+                }
+            });
+
+            AddToggleStep("toggle disabled", disabled => button.Action = disabled ? (Action)null : () => { });
+        }
+    }
+}

osu.Game/Graphics/OsuColour.cs

@@ -225,6 +225,11 @@ namespace osu.Game.Graphics
         public readonly Color4 GrayE = Color4Extensions.FromHex(@"eee");
         public readonly Color4 GrayF = Color4Extensions.FromHex(@"fff");
 
+        /// <summary>
+        /// Equivalent to <see cref="OverlayColourProvider.Blue"/>'s <see cref="OverlayColourProvider.Colour3"/>.
+        /// </summary>
+        public readonly Color4 Blue3 = Color4Extensions.FromHex(@"3399cc");
+
         /// <summary>
         /// Equivalent to <see cref="OverlayColourProvider.Lime"/>'s <see cref="OverlayColourProvider.Colour1"/>.
         /// </summary>

osu.Game/Graphics/UserInterfaceV2/RoundedButton.cs

@@ -0,0 +1,48 @@
+// 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.Graphics;
+using osu.Framework.Graphics.Effects;
+using osu.Game.Graphics.UserInterface;
+using osuTK;
+
+namespace osu.Game.Graphics.UserInterfaceV2
+{
+    public class RoundedButton : OsuButton
+    {
+        public override float Height
+        {
+            get => base.Height;
+            set
+            {
+                base.Height = value;
+
+                if (IsLoaded)
+                    updateCornerRadius();
+            }
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            BackgroundColour = colours.Blue3;
+
+            Content.EdgeEffect = new EdgeEffectParameters
+            {
+                Type = EdgeEffectType.Shadow,
+                Offset = new Vector2(0, 2),
+                Radius = 4,
+                Colour = Colour4.Black.Opacity(0.15f)
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            updateCornerRadius();
+        }
+
+        private void updateCornerRadius() => Content.CornerRadius = DrawHeight / 2;
+    }
+}