osu/osu.Game/Graphics/IHasAccentColour.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.
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using osuTK.Graphics;
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using osu.Framework.Graphics;
using osu.Framework.Graphics.Transforms;
namespace osu.Game.Graphics
{
/// <summary>
/// A type of drawable that has an accent colour.
/// The accent colour is used to colorize various objects inside a drawable
/// without colorizing the drawable itself.
/// </summary>
public interface IHasAccentColour : IDrawable
{
Color4 AccentColour { get; set; }
}
public static class AccentedColourExtensions
{
/// <summary>
/// Smoothly adjusts <see cref="IHasAccentColour.AccentColour"/> over time.
/// </summary>
/// <returns>A <see cref="TransformSequence{T}"/> to which further transforms can be added.</returns>
public static TransformSequence<T> FadeAccent<T>(this T accentedDrawable, Color4 newColour, double duration = 0, Easing easing = Easing.None)
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where T : class, IHasAccentColour
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=> accentedDrawable.TransformTo(nameof(accentedDrawable.AccentColour), newColour, duration, easing);
/// <summary>
/// Smoothly adjusts <see cref="IHasAccentColour.AccentColour"/> over time.
/// </summary>
/// <returns>A <see cref="TransformSequence{T}"/> to which further transforms can be added.</returns>
public static TransformSequence<T> FadeAccent<T>(this TransformSequence<T> t, Color4 newColour, double duration = 0, Easing easing = Easing.None)
where T : Drawable, IHasAccentColour
=> t.Append(o => o.FadeAccent(newColour, duration, easing));
}
}