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osu-lazer/osu.Game/Screens/Select/Carousel/CarouselItem.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 System;
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using osu.Framework.Bindables;
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namespace osu.Game.Screens.Select.Carousel
{
public abstract class CarouselItem : IComparable<CarouselItem>
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{
public virtual float TotalHeight => 0;
/// <summary>
/// An externally defined value used to determine this item's vertical display offset relative to the carousel.
/// </summary>
public float CarouselYPosition;
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public readonly BindableBool Filtered = new BindableBool();
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public readonly Bindable<CarouselItemState> State = new Bindable<CarouselItemState>(CarouselItemState.NotSelected);
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/// <summary>
/// This item is not in a hidden state.
/// </summary>
public bool Visible => State.Value != CarouselItemState.Collapsed && !Filtered.Value;
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protected CarouselItem()
{
Filtered.ValueChanged += filtered =>
{
if (filtered.NewValue && State.Value == CarouselItemState.Selected)
State.Value = CarouselItemState.NotSelected;
};
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}
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/// <summary>
/// Used as a default sort method for <see cref="CarouselItem"/>s of differing types.
/// </summary>
internal ulong ItemID;
/// <summary>
/// Create a fresh drawable version of this item.
/// </summary>
public abstract DrawableCarouselItem? CreateDrawableRepresentation();
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public virtual void Filter(FilterCriteria criteria)
{
}
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public virtual int CompareTo(FilterCriteria criteria, CarouselItem other) => ItemID.CompareTo(other.ItemID);
public int CompareTo(CarouselItem? other)
{
if (other == null) return 1;
return CarouselYPosition.CompareTo(other.CarouselYPosition);
}
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}
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public enum CarouselItemState
{
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Collapsed,
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NotSelected,
Selected,
}
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}