42 lines
1.2 KiB
C#
42 lines
1.2 KiB
C#
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using System.Linq;
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namespace UnityEditor.U2D.Animation
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{
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internal static class TransformCacheExtensions
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{
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internal static bool IsDescendant<T>(this T transform, T ancestor) where T : TransformCache
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{
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if (ancestor != null)
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{
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var parent = transform.parent;
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while (parent != null)
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{
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if (parent == ancestor)
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return true;
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parent = parent.parent;
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}
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}
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return false;
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}
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static bool IsDescendant<T>(this T transform, T[] ancestors) where T : TransformCache
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{
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return ancestors.FirstOrDefault( t => transform.IsDescendant<T>(t) ) != null;
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}
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internal static T[] FindRoots<T>(this T[] transforms) where T : TransformCache
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{
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return transforms.Where(t => t.IsDescendant(transforms) == false).ToArray();
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}
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internal static T FindRoot<T>(this T transform, T[] transforms) where T : TransformCache
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{
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var roots = transforms.FindRoots<T>();
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return roots.FirstOrDefault( r => transform == r || IsDescendant<T>(transform, r) );
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}
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}
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}
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