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osu-lazer/osu.Game.Rulesets.Mania/UI/PlayfieldCoveringWrapper.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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#nullable disable
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using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Colour;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osu.Game.Rulesets.UI.Scrolling;
using osuTK;
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using osuTK.Graphics;
namespace osu.Game.Rulesets.Mania.UI
{
/// <summary>
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/// A <see cref="Container"/> that has its contents partially hidden by an adjustable "cover". This is intended to be used in a playfield.
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/// </summary>
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public class PlayfieldCoveringWrapper : CompositeDrawable
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{
/// <summary>
/// The complete cover, including gradient and fill.
/// </summary>
private readonly Drawable cover;
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/// <summary>
/// The gradient portion of the cover.
/// </summary>
private readonly Box gradient;
/// <summary>
/// The fully-opaque portion of the cover.
/// </summary>
private readonly Box filled;
private readonly IBindable<ScrollingDirection> scrollDirection = new Bindable<ScrollingDirection>();
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public PlayfieldCoveringWrapper(Drawable content)
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{
InternalChild = new BufferedContainer
{
RelativeSizeAxes = Axes.Both,
Children = new[]
{
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content,
cover = new Container
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{
Anchor = Anchor.Centre,
Origin = Anchor.Centre,
RelativeSizeAxes = Axes.Both,
Blending = new BlendingParameters
{
// Don't change the destination colour.
RGBEquation = BlendingEquation.Add,
Source = BlendingType.Zero,
Destination = BlendingType.One,
// Subtract the cover's alpha from the destination (points with alpha 1 should make the destination completely transparent).
AlphaEquation = BlendingEquation.Add,
SourceAlpha = BlendingType.Zero,
DestinationAlpha = BlendingType.OneMinusSrcAlpha
},
Children = new Drawable[]
{
gradient = new Box
{
Anchor = Anchor.BottomLeft,
Origin = Anchor.BottomLeft,
RelativeSizeAxes = Axes.Both,
RelativePositionAxes = Axes.Both,
Height = 0.25f,
Colour = ColourInfo.GradientVertical(
Color4.White.Opacity(0f),
Color4.White.Opacity(1f)
)
},
filled = new Box
{
Anchor = Anchor.BottomLeft,
Origin = Anchor.BottomLeft,
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RelativeSizeAxes = Axes.Both,
Height = 0
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}
}
}
}
};
}
[BackgroundDependencyLoader]
private void load(IScrollingInfo scrollingInfo)
{
scrollDirection.BindTo(scrollingInfo.Direction);
scrollDirection.BindValueChanged(onScrollDirectionChanged, true);
}
private void onScrollDirectionChanged(ValueChangedEvent<ScrollingDirection> direction)
=> cover.Rotation = direction.NewValue == ScrollingDirection.Up ? 0 : 180f;
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/// <summary>
/// The relative area that should be completely covered. This does not include the fade.
/// </summary>
public float Coverage
{
set
{
filled.Height = value;
gradient.Y = -value;
}
}
/// <summary>
/// The direction in which the cover expands.
/// </summary>
public CoverExpandDirection Direction
{
set => cover.Scale = value == CoverExpandDirection.AlongScroll ? Vector2.One : new Vector2(1, -1);
}
}
public enum CoverExpandDirection
{
/// <summary>
/// The cover expands along the scrolling direction.
/// </summary>
AlongScroll,
/// <summary>
/// The cover expands against the scrolling direction.
/// </summary>
AgainstScroll
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}
}