87 lines
3.4 KiB
C#
87 lines
3.4 KiB
C#
// Animancer // https://kybernetik.com.au/animancer // Copyright 2018-2024 Kybernetik //
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using System;
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using System.Collections.Generic;
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using UnityEditor;
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using UnityEngine;
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using Object = UnityEngine.Object;
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namespace Animancer
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{
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/// <summary>Attribute for static methods which try to create a transition from an object.</summary>
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/// <remarks>
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/// The method signature must be:
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/// <c>static ITransitionDetailed TryCreateTransition(Object target)</c>
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/// </remarks>
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/// https://kybernetik.com.au/animancer/api/Animancer/TryCreateTransitionAttribute
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[AttributeUsage(AttributeTargets.Method)]
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public sealed class TryCreateTransitionAttribute : Attribute
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{
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/************************************************************************************************************************/
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#if UNITY_EDITOR
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/************************************************************************************************************************/
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private static List<Func<Object, ITransitionDetailed>> _Methods;
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/// <summary>[Editor-Only] Ensures that all methods with this attribute have been gathered.</summary>
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private static void InitializeMethods()
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{
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if (_Methods != null)
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return;
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_Methods = new();
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foreach (var method in TypeCache.GetMethodsWithAttribute<TryCreateTransitionAttribute>())
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{
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try
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{
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var func = Delegate.CreateDelegate(typeof(Func<Object, ITransitionDetailed>), method);
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_Methods.Add((Func<Object, ITransitionDetailed>)func);
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}
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catch (Exception exception)
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{
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Debug.LogError(
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$"Failed to create delegate for" +
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$" {method.DeclaringType.GetNameCS()}.{method.Name}," +
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$" it must take one {typeof(Object).FullName} parameter" +
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$" and return {typeof(ITransition).FullName}" +
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$": {exception}");
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}
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}
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}
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/************************************************************************************************************************/
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/// <summary>[Editor-Only] Tries to create an asset containing an appropriate transition for the `target`.</summary>
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public static TransitionAssetBase TryCreateTransitionAsset(Object target)
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{
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if (target is TransitionAssetBase asset)
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return asset;
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var assetType = TransitionAssetBase.CreateInstance;
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if (assetType == null)
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return null;
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InitializeMethods();
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for (int i = 0; i < _Methods.Count; i++)
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{
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var transition = _Methods[i](target);
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if (transition is not null)
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{
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var created = TransitionAssetBase.CreateInstance(transition);
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created.name = target.name;
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return created;
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}
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}
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return null;
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}
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/************************************************************************************************************************/
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#endif
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/************************************************************************************************************************/
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}
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}
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