Centralise fullscreen overlay logic

osu.Game/Overlays/FullscreenOverlay.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.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Effects;
+using osu.Game.Graphics;
+using osu.Game.Online.API;
+using osuTK.Graphics;
+
+namespace osu.Game.Overlays
+{
+    public abstract class FullscreenOverlay : WaveOverlayContainer, IOnlineComponent
+    {
+        [Resolved]
+        protected IAPIProvider API { get; private set; }
+
+        protected FullscreenOverlay()
+        {
+            Waves.FirstWaveColour = OsuColour.Gray(0.4f);
+            Waves.SecondWaveColour = OsuColour.Gray(0.3f);
+            Waves.ThirdWaveColour = OsuColour.Gray(0.2f);
+            Waves.FourthWaveColour = OsuColour.Gray(0.1f);
+
+            RelativeSizeAxes = Axes.Both;
+            RelativePositionAxes = Axes.Both;
+            Width = 0.85f;
+            Anchor = Anchor.TopCentre;
+            Origin = Anchor.TopCentre;
+
+            Masking = true;
+
+            EdgeEffect = new EdgeEffectParameters
+            {
+                Colour = Color4.Black.Opacity(0),
+                Type = EdgeEffectType.Shadow,
+                Radius = 10
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            API.Register(this);
+        }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+            API.Unregister(this);
+        }
+
+        public virtual void APIStateChanged(IAPIProvider api, APIState state)
+        {
+        }
+    }
+}