57 lines
2.6 KiB
C#
57 lines
2.6 KiB
C#
/// Credit setchi (https://github.com/setchi)
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/// Sourced from - https://github.com/setchi/FancyScrollView
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namespace UnityEngine.UI.Extensions
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{
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/// <summary>
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/// <see cref="FancyScrollRect{TItemData, TContext}"/> のセルを実装するための抽象基底クラス.
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/// <see cref="FancyCell{TItemData, TContext}.Context"/> が不要な場合は
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/// 代わりに <see cref="FancyScrollRectCell{TItemData}"/> を使用します.
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/// </summary>
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/// <typeparam name="TItemData">アイテムのデータ型.</typeparam>
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/// <typeparam name="TContext"><see cref="FancyCell{TItemData, TContext}.Context"/> の型.</typeparam>
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public abstract class FancyScrollRectCell<TItemData, TContext> : FancyCell<TItemData, TContext>
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where TContext : class, IFancyScrollRectContext, new()
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{
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/// <inheritdoc/>
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public override void UpdatePosition(float position)
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{
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var (scrollSize, reuseMargin) = Context.CalculateScrollSize();
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var normalizedPosition = (Mathf.Lerp(0f, scrollSize, position) - reuseMargin) / (scrollSize - reuseMargin * 2f);
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var start = 0.5f * scrollSize;
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var end = -start;
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UpdatePosition(normalizedPosition, Mathf.Lerp(start, end, position));
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}
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/// <summary>
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/// このセルの位置を更新します.
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/// </summary>
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/// <param name="normalizedPosition">
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/// ビューポートの範囲で正規化されたスクロール位置.
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/// <see cref="FancyScrollRect{TItemData, TContext}.reuseCellMarginCount"/> の値に基づいて
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/// <c>0.0</c> ~ <c>1.0</c> の範囲を超えた値が渡されることがあります.
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/// </param>
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/// <param name="localPosition">ローカル位置.</param>
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protected virtual void UpdatePosition(float normalizedPosition, float localPosition)
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{
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transform.localPosition = Context.ScrollDirection == ScrollDirection.Horizontal
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? new Vector2(-localPosition, 0)
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: new Vector2(0, localPosition);
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}
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}
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/// <summary>
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/// <see cref="FancyScrollRect{TItemData}"/> のセルを実装するための抽象基底クラス.
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/// </summary>
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/// <typeparam name="TItemData">アイテムのデータ型.</typeparam>
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/// <seealso cref="FancyScrollRectCell{TItemData, TContext}"/>
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public abstract class FancyScrollRectCell<TItemData> : FancyScrollRectCell<TItemData, FancyScrollRectContext>
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{
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/// <inheritdoc/>
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public sealed override void SetContext(FancyScrollRectContext context) => base.SetContext(context);
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}
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}
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