Implement ShearedSliderBar.cs and corresponding TestSceneShearedSliderBar.cs

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

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+// 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.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public partial class TestSceneShearedSlider : OsuTestScene
+    {
+        [Cached]
+        private OverlayColourProvider colourProvider { get; set; } = new OverlayColourProvider(OverlayColourScheme.Purple);
+
+        private readonly BindableDouble current = new BindableDouble(5)
+        {
+            Precision = 0.1f,
+            MinValue = 0,
+            MaxValue = 15
+        };
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Child = new ShearedSliderBar<double>
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Current = current,
+                RelativeSizeAxes = Axes.X,
+                Width = 0.4f
+            };
+        }
+    }
+}