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osu-lazer/osu.Game.Rulesets.Mania/UI/PlayfieldCoveringWrapper.cs
2024-02-15 16:40:58 +01:00

172 lines
6.2 KiB
C#

// 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 System;
using System.ComponentModel;
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.Framework.Utils;
using osu.Game.Rulesets.UI.Scrolling;
using osuTK;
using osuTK.Graphics;
using Container = osu.Framework.Graphics.Containers.Container;
namespace osu.Game.Rulesets.Mania.UI
{
/// <summary>
/// A <see cref="Framework.Graphics.Containers.Container"/> that has its contents partially hidden by an adjustable "cover". This is intended to be used in a playfield.
/// </summary>
public partial class PlayfieldCoveringWrapper : CompositeDrawable
{
/// <summary>
/// The relative area that should be completely covered. This does not include the fade.
/// </summary>
public readonly BindableFloat Coverage = new BindableFloat();
/// <summary>
/// The complete cover, including gradient and fill.
/// </summary>
private readonly Drawable cover;
/// <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>();
private float currentCoverageHeight;
public PlayfieldCoveringWrapper(Drawable content)
{
InternalChild = new BufferedContainer
{
RelativeSizeAxes = Axes.Both,
Children = new[]
{
content,
cover = new Container
{
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,
RelativeSizeAxes = Axes.Both,
Height = 0
}
}
}
}
};
}
[BackgroundDependencyLoader]
private void load(IScrollingInfo scrollingInfo)
{
scrollDirection.BindTo(scrollingInfo.Direction);
scrollDirection.BindValueChanged(onScrollDirectionChanged, true);
}
protected override void LoadComplete()
{
base.LoadComplete();
updateCoverSize(true);
}
protected override void Update()
{
base.Update();
updateCoverSize(false);
}
private void updateCoverSize(bool instant)
{
float targetCoverage;
float targetAlpha;
if (instant)
{
targetCoverage = Coverage.Value;
targetAlpha = Coverage.Value > 0 ? 1 : 0;
}
else
{
targetCoverage = (float)Interpolation.DampContinuously(currentCoverageHeight, Coverage.Value, 25, Math.Abs(Time.Elapsed));
targetAlpha = (float)Interpolation.DampContinuously(gradient.Alpha, Coverage.Value > 0 ? 1 : 0, 25, Math.Abs(Time.Elapsed));
}
filled.Height = GetHeight(targetCoverage);
gradient.Y = -GetHeight(targetCoverage);
gradient.Alpha = targetAlpha;
currentCoverageHeight = targetCoverage;
}
protected virtual float GetHeight(float coverage) => coverage;
private void onScrollDirectionChanged(ValueChangedEvent<ScrollingDirection> direction)
=> cover.Rotation = direction.NewValue == ScrollingDirection.Up ? 0 : 180f;
/// <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>
[Description("Along scroll")]
AlongScroll,
/// <summary>
/// The cover expands against the scrolling direction.
/// </summary>
[Description("Against scroll")]
AgainstScroll
}
}