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178 lines
5.0 KiB
C#
178 lines
5.0 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.Diagnostics;
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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.Framework.Graphics.Pooling;
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using osu.Framework.Input.Events;
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using osuTK;
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namespace osu.Game.Screens.Select.Carousel
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{
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public abstract partial class DrawableCarouselItem : PoolableDrawable
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{
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public const float MAX_HEIGHT = 80;
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public override bool IsPresent => base.IsPresent || Item?.Visible == true;
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public override bool HandlePositionalInput => Item?.Visible == true;
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public override bool PropagatePositionalInputSubTree => Item?.Visible == true;
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public readonly CarouselHeader Header;
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/// <summary>
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/// Optional content which sits below the header.
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/// </summary>
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protected readonly Container<Drawable> Content;
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protected readonly Container MovementContainer;
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public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
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Header.ReceivePositionalInputAt(screenSpacePos);
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private CarouselItem? item;
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public CarouselItem? Item
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{
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get => item;
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set
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{
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if (item == value)
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return;
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if (item != null)
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{
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item.Filtered.ValueChanged -= onStateChange;
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item.State.ValueChanged -= onStateChange;
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Header.State.UnbindFrom(item.State);
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if (item is CarouselGroup group)
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{
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foreach (var c in group.Items)
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c.Filtered.ValueChanged -= onStateChange;
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}
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}
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item = value;
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if (IsLoaded && !IsDisposed)
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UpdateItem();
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}
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}
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protected DrawableCarouselItem()
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{
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RelativeSizeAxes = Axes.X;
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Alpha = 0;
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InternalChildren = new Drawable[]
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{
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MovementContainer = new Container
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{
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RelativeSizeAxes = Axes.Both,
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Children = new Drawable[]
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{
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Header = new CarouselHeader(),
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Content = new Container
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{
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RelativeSizeAxes = Axes.Both,
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}
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}
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},
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};
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}
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public void SetMultiplicativeAlpha(float alpha) => Header.BorderContainer.Alpha = alpha;
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protected override void LoadComplete()
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{
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base.LoadComplete();
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UpdateItem();
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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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Content.Y = Header.Height;
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}
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protected virtual void UpdateItem()
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{
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if (Item == null)
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return;
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Scheduler.AddOnce(ApplyState);
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Item.Filtered.ValueChanged += onStateChange;
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Item.State.ValueChanged += onStateChange;
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Header.State.BindTo(Item.State);
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if (Item is CarouselGroup group)
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{
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foreach (var c in group.Items)
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c.Filtered.ValueChanged += onStateChange;
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}
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}
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private void onStateChange(ValueChangedEvent<CarouselItemState> obj) => Scheduler.AddOnce(ApplyState);
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private void onStateChange(ValueChangedEvent<bool> _) => Scheduler.AddOnce(ApplyState);
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protected virtual void ApplyState()
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{
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Debug.Assert(Item != null);
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// Use the fact that we know the precise height of the item from the model to avoid the need for AutoSize overhead.
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// Additionally, AutoSize doesn't work well due to content starting off-screen and being masked away.
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Height = Item.TotalHeight;
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switch (Item.State.Value)
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{
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case CarouselItemState.NotSelected:
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Deselected();
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break;
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case CarouselItemState.Selected:
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Selected();
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break;
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}
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if (!Item.Visible)
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this.FadeOut(100, Easing.OutQuint);
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else
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this.FadeIn(400, Easing.OutQuint);
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}
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protected virtual void Selected()
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{
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Debug.Assert(Item != null);
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}
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protected virtual void Deselected()
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{
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}
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protected override bool OnClick(ClickEvent e)
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{
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Debug.Assert(Item != null);
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Item.State.Value = CarouselItemState.Selected;
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return true;
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}
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protected override void Dispose(bool isDisposing)
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{
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base.Dispose(isDisposing);
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// This is important to clean up event subscriptions.
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Item = null;
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}
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}
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}
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