Add test scene for playing with safe areas

osu.Game.Tests/Visual/UserInterface/TestSceneSafeAreaHandling.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.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Overlays.Settings;
+using osuTK.Graphics;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneSafeAreaHandling : OsuGameTestScene
+    {
+        private SafeAreaDefiningContainer safeAreaContainer;
+
+        private static BindableSafeArea safeArea;
+
+        private readonly Bindable<float> safeAreaPaddingTop = new BindableFloat { MinValue = 0, MaxValue = 200 };
+        private readonly Bindable<float> safeAreaPaddingBottom = new BindableFloat { MinValue = 0, MaxValue = 200 };
+        private readonly Bindable<float> safeAreaPaddingLeft = new BindableFloat { MinValue = 0, MaxValue = 200 };
+        private readonly Bindable<float> safeAreaPaddingRight = new BindableFloat { MinValue = 0, MaxValue = 200 };
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            // Usually this would be placed between the host and the game, but that's a bit of a pain to do with the test scene hierarchy.
+
+            // Add is required for the container to get a size (and give out correct metrics to the usages in SafeAreaContainer).
+            Add(
+                safeAreaContainer = new SafeAreaDefiningContainer(safeArea = new BindableSafeArea())
+                {
+                    RelativeSizeAxes = Axes.Both
+                });
+
+            // Cache is required for the test game to see the safe area.
+            Dependencies.CacheAs<ISafeArea>(safeAreaContainer);
+        }
+
+        public override void SetUpSteps()
+        {
+            AddStep("Add adjust controls", () =>
+            {
+                Add(new Container
+                {
+                    Depth = float.MinValue,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    AutoSizeAxes = Axes.Both,
+                    Children = new Drawable[]
+                    {
+                        new Box
+                        {
+                            Colour = Color4.Black,
+                            RelativeSizeAxes = Axes.Both,
+                            Alpha = 0.8f,
+                        },
+                        new FillFlowContainer
+                        {
+                            AutoSizeAxes = Axes.Y,
+                            Width = 400,
+                            Children = new Drawable[]
+                            {
+                                new SettingsSlider<float>
+                                {
+                                    Current = safeAreaPaddingTop,
+                                    LabelText = "Top"
+                                },
+                                new SettingsSlider<float>
+                                {
+                                    Current = safeAreaPaddingBottom,
+                                    LabelText = "Bottom"
+                                },
+                                new SettingsSlider<float>
+                                {
+                                    Current = safeAreaPaddingLeft,
+                                    LabelText = "Left"
+                                },
+                                new SettingsSlider<float>
+                                {
+                                    Current = safeAreaPaddingRight,
+                                    LabelText = "Right"
+                                },
+                            }
+                        }
+                    }
+                });
+
+                safeAreaPaddingTop.BindValueChanged(_ => updateSafeArea());
+                safeAreaPaddingBottom.BindValueChanged(_ => updateSafeArea());
+                safeAreaPaddingLeft.BindValueChanged(_ => updateSafeArea());
+                safeAreaPaddingRight.BindValueChanged(_ => updateSafeArea());
+            });
+
+            base.SetUpSteps();
+        }
+
+        private void updateSafeArea()
+        {
+            safeArea.Value = new MarginPadding
+            {
+                Top = safeAreaPaddingTop.Value,
+                Bottom = safeAreaPaddingBottom.Value,
+                Left = safeAreaPaddingLeft.Value,
+                Right = safeAreaPaddingRight.Value,
+            };
+        }
+
+        [Test]
+        public void TestSafeArea()
+        {
+        }
+    }
+}