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https://github.com/ppy/osu
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123 lines
4.5 KiB
C#
123 lines
4.5 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.Linq;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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using osu.Game.Graphics.Containers;
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using osuTK;
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namespace osu.Game.Collections
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{
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/// <summary>
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/// Visualises a list of <see cref="BeatmapCollection"/>s.
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/// </summary>
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public class DrawableCollectionList : OsuRearrangeableListContainer<BeatmapCollection>
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{
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private Scroll scroll;
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protected override ScrollContainer<Drawable> CreateScrollContainer() => scroll = new Scroll();
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protected override FillFlowContainer<RearrangeableListItem<BeatmapCollection>> CreateListFillFlowContainer() => new Flow
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{
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DragActive = { BindTarget = DragActive }
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};
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protected override OsuRearrangeableListItem<BeatmapCollection> CreateOsuDrawable(BeatmapCollection item)
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{
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if (item == scroll.PlaceholderItem.Model)
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return scroll.ReplacePlaceholder();
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return new DrawableCollectionListItem(item, true);
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}
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/// <summary>
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/// The scroll container for this <see cref="DrawableCollectionList"/>.
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/// Contains the main flow of <see cref="DrawableCollectionListItem"/> and attaches a placeholder item to the end of the list.
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/// </summary>
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/// <remarks>
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/// Use <see cref="ReplacePlaceholder"/> to transfer the placeholder into the main list.
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/// </remarks>
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private class Scroll : OsuScrollContainer
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{
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/// <summary>
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/// The currently-displayed placeholder item.
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/// </summary>
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public DrawableCollectionListItem PlaceholderItem { get; private set; }
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protected override Container<Drawable> Content => content;
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private readonly Container content;
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private readonly Container<DrawableCollectionListItem> placeholderContainer;
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public Scroll()
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{
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ScrollbarVisible = false;
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Padding = new MarginPadding(10);
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base.Content.Add(new FillFlowContainer
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{
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RelativeSizeAxes = Axes.X,
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AutoSizeAxes = Axes.Y,
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LayoutDuration = 200,
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LayoutEasing = Easing.OutQuint,
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Children = new Drawable[]
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{
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content = new Container { RelativeSizeAxes = Axes.X },
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placeholderContainer = new Container<DrawableCollectionListItem>
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{
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RelativeSizeAxes = Axes.X,
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AutoSizeAxes = Axes.Y
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}
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}
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});
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ReplacePlaceholder();
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}
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protected override void Update()
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{
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base.Update();
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// AutoSizeAxes cannot be used as the height should represent the post-layout-transform height at all times, so that the placeholder doesn't bounce around.
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content.Height = ((Flow)Child).Children.Sum(c => c.DrawHeight + 5);
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}
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/// <summary>
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/// Replaces the current <see cref="PlaceholderItem"/> with a new one, and returns the previous.
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/// </summary>
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/// <returns>The current <see cref="PlaceholderItem"/>.</returns>
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public DrawableCollectionListItem ReplacePlaceholder()
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{
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var previous = PlaceholderItem;
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placeholderContainer.Clear(false);
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placeholderContainer.Add(PlaceholderItem = new DrawableCollectionListItem(new BeatmapCollection(), false));
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return previous;
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}
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}
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/// <summary>
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/// The flow of <see cref="DrawableCollectionListItem"/>. Disables layout easing unless a drag is in progress.
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/// </summary>
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private class Flow : FillFlowContainer<RearrangeableListItem<BeatmapCollection>>
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{
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public readonly IBindable<bool> DragActive = new Bindable<bool>();
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public Flow()
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{
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Spacing = new Vector2(0, 5);
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LayoutEasing = Easing.OutQuint;
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}
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protected override void LoadComplete()
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{
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base.LoadComplete();
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DragActive.BindValueChanged(active => LayoutDuration = active.NewValue ? 200 : 0);
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}
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}
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}
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}
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