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92 lines
3.2 KiB
C#
92 lines
3.2 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 System.Collections.Generic;
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using System.Linq;
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namespace osu.Game.Screens.Select.Carousel
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{
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/// <summary>
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/// A group which ensures only one child is selected.
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/// </summary>
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public class CarouselGroup : CarouselItem
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{
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public override DrawableCarouselItem CreateDrawableRepresentation() => null;
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public IReadOnlyList<CarouselItem> Children => InternalChildren;
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protected List<CarouselItem> InternalChildren = new List<CarouselItem>();
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/// <summary>
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/// Used to assign a monotonically increasing ID to children as they are added. This member is
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/// incremented whenever a child is added.
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/// </summary>
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private ulong currentChildID;
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public virtual void RemoveChild(CarouselItem i)
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{
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InternalChildren.Remove(i);
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// it's important we do the deselection after removing, so any further actions based on
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// State.ValueChanged make decisions post-removal.
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i.State.Value = CarouselItemState.Collapsed;
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}
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public virtual void AddChild(CarouselItem i)
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{
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i.State.ValueChanged += state => ChildItemStateChanged(i, state.NewValue);
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i.ChildID = ++currentChildID;
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InternalChildren.Add(i);
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}
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public CarouselGroup(List<CarouselItem> items = null)
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{
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if (items != null) InternalChildren = items;
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State.ValueChanged += state =>
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{
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switch (state.NewValue)
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{
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case CarouselItemState.Collapsed:
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case CarouselItemState.NotSelected:
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InternalChildren.ForEach(c => c.State.Value = CarouselItemState.Collapsed);
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break;
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case CarouselItemState.Selected:
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InternalChildren.ForEach(c =>
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{
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if (c.State.Value == CarouselItemState.Collapsed) c.State.Value = CarouselItemState.NotSelected;
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});
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break;
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}
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};
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}
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public override void Filter(FilterCriteria criteria)
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{
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base.Filter(criteria);
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InternalChildren.ForEach(c => c.Filter(criteria));
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// IEnumerable<T>.OrderBy() is used instead of List<T>.Sort() to ensure sorting stability
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var criteriaComparer = Comparer<CarouselItem>.Create((x, y) => x.CompareTo(criteria, y));
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InternalChildren = InternalChildren.OrderBy(c => c, criteriaComparer).ToList();
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}
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protected virtual void ChildItemStateChanged(CarouselItem item, CarouselItemState value)
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{
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// ensure we are the only item selected
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if (value == CarouselItemState.Selected)
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{
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foreach (var b in InternalChildren)
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{
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if (item == b) continue;
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b.State.Value = CarouselItemState.NotSelected;
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}
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State.Value = CarouselItemState.Selected;
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}
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}
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}
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}
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