Move the waves portion of WaveOverlayContainer to WaveContainer to allow usage in other places.

osu.Game/Graphics/Containers/WaveContainer.cs

@@ -0,0 +1,167 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using OpenTK.Graphics;
+
+namespace osu.Game.Graphics.Containers
+{
+    public class WaveContainer : VisibilityContainer
+    {
+        public const float APPEAR_DURATION = 800;
+        public const float DISAPPEAR_DURATION = 500;
+
+        private const Easing easing_show = Easing.OutSine;
+        private const Easing easing_hide = Easing.InSine;
+
+        private readonly Wave firstWave;
+        private readonly Wave secondWave;
+        private readonly Wave thirdWave;
+        private readonly Wave fourthWave;
+
+        private readonly Container<Wave> wavesContainer;
+        private readonly Container contentContainer;
+
+        protected override Container<Drawable> Content => contentContainer;
+
+        public Color4 FirstWaveColour
+        {
+            get => firstWave.Colour;
+            set => firstWave.Colour = value;
+        }
+
+        public Color4 SecondWaveColour
+        {
+            get => secondWave.Colour;
+            set => secondWave.Colour = value;
+        }
+
+        public Color4 ThirdWaveColour
+        {
+            get => thirdWave.Colour;
+            set => thirdWave.Colour = value;
+        }
+
+        public Color4 FourthWaveColour
+        {
+            get => fourthWave.Colour;
+            set => fourthWave.Colour = value;
+        }
+
+        public WaveContainer()
+        {
+            Masking = true;
+
+            AddInternal(wavesContainer = new Container<Wave>
+            {
+                RelativeSizeAxes = Axes.X,
+                Origin = Anchor.TopCentre,
+                Anchor = Anchor.TopCentre,
+                Masking = true,
+                Children = new[]
+                {
+                    firstWave = new Wave
+                    {
+                        Rotation = 13,
+                        FinalPosition = -930,
+                    },
+                    secondWave = new Wave
+                    {
+                        Origin = Anchor.TopRight,
+                        Anchor = Anchor.TopRight,
+                        Rotation = -7,
+                        FinalPosition = -560,
+                    },
+                    thirdWave = new Wave
+                    {
+                        Rotation = 4,
+                        FinalPosition = -390,
+                    },
+                    fourthWave = new Wave
+                    {
+                        Origin = Anchor.TopRight,
+                        Anchor = Anchor.TopRight,
+                        Rotation = -2,
+                        FinalPosition = -220,
+                    },
+                },
+            });
+
+            AddInternal(contentContainer = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Anchor = Anchor.BottomCentre,
+                Origin = Anchor.BottomCentre,
+            });
+        }
+
+        protected override void PopIn()
+        {
+            foreach (var w in wavesContainer.Children)
+                w.State = Visibility.Visible;
+
+            this.FadeIn(100, Easing.OutQuint);
+            contentContainer.MoveToY(0, APPEAR_DURATION, Easing.OutQuint);
+
+            this.FadeIn(100, Easing.OutQuint);
+        }
+
+        protected override void PopOut()
+        {
+            this.FadeOut(DISAPPEAR_DURATION, Easing.InQuint);
+            contentContainer.MoveToY(DrawHeight * 2f, DISAPPEAR_DURATION, Easing.In);
+
+            foreach (var w in wavesContainer.Children)
+                w.State = Visibility.Hidden;
+
+            this.FadeOut(DISAPPEAR_DURATION, Easing.InQuint);
+        }
+
+        protected override void UpdateAfterChildren()
+        {
+            base.UpdateAfterChildren();
+
+            // This is done as an optimization, such that invisible parts of the waves
+            // are masked away, and thus do not consume fill rate.
+            wavesContainer.Height = Math.Max(0, DrawHeight - (contentContainer.DrawHeight - contentContainer.Y));
+        }
+
+        private class Wave : VisibilityContainer
+        {
+            public float FinalPosition;
+
+            protected override bool StartHidden => true;
+
+            public Wave()
+            {
+                RelativeSizeAxes = Axes.X;
+                Width = 1.5f;
+                Masking = true;
+                EdgeEffect = new EdgeEffectParameters
+                {
+                    Type = EdgeEffectType.Shadow,
+                    Colour = Color4.Black.Opacity(50),
+                    Radius = 20f,
+                };
+
+                Child = new Box { RelativeSizeAxes = Axes.Both };
+            }
+
+            protected override void Update()
+            {
+                base.Update();
+
+                // We can not use RelativeSizeAxes for Height, because the height
+                // of our parent diminishes as the content moves up.
+                Height = Parent.Parent.DrawSize.Y * 1.5f;
+            }
+
+            protected override void PopIn() => this.MoveToY(FinalPosition, APPEAR_DURATION, easing_show);
+            protected override void PopOut() => this.MoveToY(Parent.Parent.DrawSize.Y, DISAPPEAR_DURATION, easing_hide);
+        }
+    }
+}