Initial implementation of new flow (only working for approach rate)

osu.Game.Tests/Visual/UserInterface/TestSceneModDifficultyAdjustSettings.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 NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Configuration;
+using osu.Game.Rulesets.Osu.Mods;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneModDifficultyAdjustSettings : OsuManualInputManagerTestScene
+    {
+        [SetUpSteps]
+        public void SetUpSteps()
+        {
+            AddStep("create difficulty adjust", () =>
+            {
+                var modDifficultyAdjust = new OsuModDifficultyAdjust();
+
+                Child = new Container
+                {
+                    Size = new Vector2(300),
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Children = new Drawable[]
+                    {
+                        new Box
+                        {
+                            Colour = Color4.Black,
+                            RelativeSizeAxes = Axes.Both,
+                        },
+                        new FillFlowContainer
+                        {
+                            RelativeSizeAxes = Axes.X,
+                            AutoSizeAxes = Axes.Y,
+                            ChildrenEnumerable = modDifficultyAdjust.CreateSettingsControls(),
+                        },
+                    }
+                };
+            });
+
+            setBeatmapWithDifficultyParameters(5);
+            setBeatmapWithDifficultyParameters(8);
+        }
+
+        [Test]
+        public void TestBasic()
+        {
+        }
+
+        private void setBeatmapWithDifficultyParameters(float value)
+        {
+            AddStep($"set beatmap with all {value}", () => Beatmap.Value = CreateWorkingBeatmap(new Beatmap()
+            {
+                BeatmapInfo = new BeatmapInfo
+                {
+                    BaseDifficulty = new BeatmapDifficulty
+                    {
+                        OverallDifficulty = value,
+                        CircleSize = value,
+                        DrainRate = value,
+                        ApproachRate = value,
+                    }
+                }
+            }));
+        }
+    }
+}