mirror of https://github.com/ppy/osu
115 lines
4.4 KiB
C#
115 lines
4.4 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using osu.Framework.Allocation;
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using osu.Framework.Bindables;
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using osu.Framework.Extensions.Color4Extensions;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Colour;
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using osu.Framework.Graphics.Containers;
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using osu.Framework.Graphics.Shapes;
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using osu.Game.Rulesets.UI.Scrolling;
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using osuTK.Graphics;
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namespace osu.Game.Rulesets.Mania.UI
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{
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/// <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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/// <remarks>
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/// The covered area extends in the scrolling direction, with its size depending on <see cref="Coverage"/>.
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/// </remarks>
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public class PlayfieldCoveringContainer : CompositeDrawable
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{
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/// <summary>
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/// The complete cover, including gradient and fill.
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/// </summary>
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protected readonly Drawable Cover;
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/// <summary>
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/// The gradient portion of the cover.
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/// </summary>
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private readonly Box gradient;
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/// <summary>
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/// The fully-opaque portion of the cover.
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/// </summary>
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private readonly Box filled;
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private readonly IBindable<ScrollingDirection> scrollDirection = new Bindable<ScrollingDirection>();
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public PlayfieldCoveringContainer(Drawable content)
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{
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InternalChild = new BufferedContainer
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{
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RelativeSizeAxes = Axes.Both,
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Children = new[]
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{
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content,
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Cover = new Container
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{
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Anchor = Anchor.Centre,
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Origin = Anchor.Centre,
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RelativeSizeAxes = Axes.Both,
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Blending = new BlendingParameters
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{
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// Don't change the destination colour.
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RGBEquation = BlendingEquation.Add,
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Source = BlendingType.Zero,
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Destination = BlendingType.One,
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// Subtract the cover's alpha from the destination (points with alpha 1 should make the destination completely transparent).
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AlphaEquation = BlendingEquation.Add,
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SourceAlpha = BlendingType.Zero,
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DestinationAlpha = BlendingType.OneMinusSrcAlpha
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},
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Children = new Drawable[]
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{
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gradient = new Box
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{
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Anchor = Anchor.BottomLeft,
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Origin = Anchor.BottomLeft,
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RelativeSizeAxes = Axes.Both,
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RelativePositionAxes = Axes.Both,
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Height = 0.25f,
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Colour = ColourInfo.GradientVertical(
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Color4.White.Opacity(0f),
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Color4.White.Opacity(1f)
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)
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},
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filled = new Box
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{
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Anchor = Anchor.BottomLeft,
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Origin = Anchor.BottomLeft,
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RelativeSizeAxes = Axes.Both,
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Height = 0
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}
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}
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}
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}
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};
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}
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[BackgroundDependencyLoader]
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private void load(IScrollingInfo scrollingInfo)
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{
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scrollDirection.BindTo(scrollingInfo.Direction);
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scrollDirection.BindValueChanged(onScrollDirectionChanged, true);
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}
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private void onScrollDirectionChanged(ValueChangedEvent<ScrollingDirection> direction)
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=> Cover.Rotation = direction.NewValue == ScrollingDirection.Up ? 0 : 180f;
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/// <summary>
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/// The relative area that should be completely covered. This does not include the fade.
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/// </summary>
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public float Coverage
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{
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set
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{
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filled.Height = value;
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gradient.Y = -value;
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}
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}
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}
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}
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