[csharp] Changed Skin.Attachment type to generic OrderedDictionary. Cleaned up related code. Closes #1433.

spine-csharp/src/Collections/OrderedDictionary.cs

@@ -0,0 +1,636 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated May 1, 2019. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2019, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
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+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+/******************************************************************************
+ * Thanks to Travis Parks
+ * https://github.com/jehugaleahsa/truncon.collections.OrderedDictionary
+ *****************************************************************************/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+
+#if UNITY_EDITOR
+using System.Linq;
+#endif
+
+namespace Spine.Collections
+{
+	/// <summary>
+	/// Represents a dictionary that tracks the order that items were added.
+	/// </summary>
+	/// <typeparam name="TKey">The type of the dictionary keys.</typeparam>
+	/// <typeparam name="TValue">The type of the dictionary values.</typeparam>
+	/// <remarks>
+	/// This dictionary makes it possible to get the index of a key and a key based on an index.
+	/// It can be costly to find the index of a key because it must be searched for linearly.
+	/// It can be costly to insert a key/value pair because other key's indexes must be adjusted.
+	/// It can be costly to remove a key/value pair because other keys' indexes must be adjusted.
+	/// </remarks>
+	[DebuggerDisplay("Count = {Count}")]
+	[DebuggerTypeProxy(typeof(OrderedDictionaryDebugView<,>))]
+	public sealed class OrderedDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IList<KeyValuePair<TKey, TValue>>
+	{
+		private readonly Dictionary<TKey, int> dictionary;
+		private readonly List<TKey> keys;
+		private readonly List<TValue> values;
+		private int version;
+
+		private const string CollectionModifiedMessage = "Collection was modified; enumeration operation may not execute.";
+		private const string EditReadOnlyListMessage = "An attempt was made to edit a read-only list.";
+		private const string IndexOutOfRangeMessage = "The index is negative or outside the bounds of the collection.";
+
+		/// <summary>
+		/// Initializes a new instance of an OrderedDictionary.
+		/// </summary>
+		public OrderedDictionary ()
+			: this(0, null) {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of an OrderedDictionary.
+		/// </summary>
+		/// <param name="capacity">The initial capacity of the dictionary.</param>
+		/// <exception cref="System.ArgumentOutOfRangeException">The capacity is less than zero.</exception>
+		public OrderedDictionary (int capacity)
+			: this(capacity, null) {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of an OrderedDictionary.
+		/// </summary>
+		/// <param name="comparer">The equality comparer to use to compare keys.</param>
+		public OrderedDictionary (IEqualityComparer<TKey> comparer)
+			: this(0, comparer) {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of an OrderedDictionary.
+		/// </summary>
+		/// <param name="capacity">The initial capacity of the dictionary.</param>
+		/// <param name="comparer">The equality comparer to use to compare keys.</param>
+		public OrderedDictionary (int capacity, IEqualityComparer<TKey> comparer) {
+			dictionary = new Dictionary<TKey, int>(capacity, comparer ?? EqualityComparer<TKey>.Default);
+			keys = new List<TKey>(capacity);
+			values = new List<TValue>(capacity);
+		}
+
+		/// <summary>
+		/// Gets the equality comparer used to compare keys.
+		/// </summary>
+		public IEqualityComparer<TKey> Comparer {
+			get {
+				return dictionary.Comparer;
+			}
+		}
+
+		/// <summary>
+		/// Adds the given key/value pair to the dictionary.
+		/// </summary>
+		/// <param name="key">The key to add to the dictionary.</param>
+		/// <param name="value">The value to associated with the key.</param>
+		/// <exception cref="System.ArgumentException">The given key already exists in the dictionary.</exception>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		public void Add (TKey key, TValue value) {
+			dictionary.Add(key, values.Count);
+			keys.Add(key);
+			values.Add(value);
+			++version;
+		}
+
+		/// <summary>
+		/// Inserts the given key/value pair at the specified index.
+		/// </summary>
+		/// <param name="index">The index to insert the key/value pair.</param>
+		/// <param name="key">The key to insert.</param>
+		/// <param name="value">The value to insert.</param>
+		/// <exception cref="System.ArgumentException">The given key already exists in the dictionary.</exception>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		/// <exception cref="System.ArgumentOutOfRangeException">The index is negative -or- larger than the size of the dictionary.</exception>
+		public void Insert (int index, TKey key, TValue value) {
+			if (index < 0 || index > values.Count) {
+				throw new ArgumentOutOfRangeException("index", index, IndexOutOfRangeMessage);
+			}
+			dictionary.Add(key, index);
+			for (int keyIndex = index; keyIndex != keys.Count; ++keyIndex) {
+				var otherKey = keys[keyIndex];
+				dictionary[otherKey] += 1;
+			}
+			keys.Insert(index, key);
+			values.Insert(index, value);
+			++version;
+		}
+
+		/// <summary>
+		/// Determines whether the given key exists in the dictionary.
+		/// </summary>
+		/// <param name="key">The key to look for.</param>
+		/// <returns>True if the key exists in the dictionary; otherwise, false.</returns>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		public bool ContainsKey (TKey key) {
+			return dictionary.ContainsKey(key);
+		}
+
+		/// <summary>
+		/// Gets the key at the given index.
+		/// </summary>
+		/// <param name="index">The index of the key to get.</param>
+		/// <returns>The key at the given index.</returns>
+		/// <exception cref="System.ArgumentOutOfRangeException">The index is negative -or- larger than the number of keys.</exception>
+		public TKey GetKey (int index) {
+			return keys[index];
+		}
+
+		/// <summary>
+		/// Gets the index of the given key.
+		/// </summary>
+		/// <param name="key">The key to get the index of.</param>
+		/// <returns>The index of the key in the dictionary -or- -1 if the key is not found.</returns>
+		/// <remarks>The operation runs in O(n).</remarks>
+		public int IndexOf (TKey key) {
+			int index;
+			if (dictionary.TryGetValue(key, out index)) {
+				return index;
+			}
+			return -1;
+		}
+
+		/// <summary>
+		/// Gets the keys in the dictionary in the order they were added.
+		/// </summary>
+		public KeyCollection Keys {
+			get {
+				return new KeyCollection(this.dictionary);
+			}
+		}
+
+		/// <summary>
+		/// Removes the key/value pair with the given key from the dictionary.
+		/// </summary>
+		/// <param name="key">The key of the pair to remove.</param>
+		/// <returns>True if the key was found and the pair removed; otherwise, false.</returns>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		public bool Remove (TKey key) {
+			int index;
+			if (dictionary.TryGetValue(key, out index)) {
+				RemoveAt(index);
+				return true;
+			}
+			return false;
+		}
+
+		/// <summary>
+		/// Removes the key/value pair at the given index.
+		/// </summary>
+		/// <param name="index">The index of the key/value pair to remove.</param>
+		/// <exception cref="System.ArgumentOutOfRangeException">The index is negative -or- larger than the size of the dictionary.</exception>
+		public void RemoveAt (int index) {
+			var key = keys[index];
+			for (int keyIndex = index + 1; keyIndex < keys.Count; ++keyIndex) {
+				var otherKey = keys[keyIndex];
+				dictionary[otherKey] -= 1;
+			}
+			dictionary.Remove(key);
+			keys.RemoveAt(index);
+			values.RemoveAt(index);
+			++version;
+		}
+
+		/// <summary>
+		/// Tries to get the value associated with the given key. If the key is not found,
+		/// default(TValue) value is stored in the value.
+		/// </summary>
+		/// <param name="key">The key to get the value for.</param>
+		/// <param name="value">The value used to hold the results.</param>
+		/// <returns>True if the key was found; otherwise, false.</returns>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		public bool TryGetValue (TKey key, out TValue value) {
+			int index;
+			if (dictionary.TryGetValue(key, out index)) {
+				value = values[index];
+				return true;
+			}
+			value = default(TValue);
+			return false;
+		}
+
+		/// <summary>
+		/// Gets the values in the dictionary.
+		/// </summary>
+		public ValueCollection Values {
+			get {
+				return new ValueCollection(values);
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets the value at the given index.
+		/// </summary>
+		/// <param name="index">The index of the value to get.</param>
+		/// <returns>The value at the given index.</returns>
+		/// <exception cref="System.ArgumentOutOfRangeException">The index is negative -or- beyond the length of the dictionary.</exception>
+		public TValue this[int index] {
+			get {
+				return values[index];
+			}
+
+			set {
+				values[index] = value;
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets the value associated with the given key.
+		/// </summary>
+		/// <param name="key">The key to get the associated value by or to associate with the value.</param>
+		/// <returns>The value associated with the given key.</returns>
+		/// <exception cref="System.ArgumentNullException">The key is null.</exception>
+		/// <exception cref="System.Collections.Generic.KeyNotFoundException">The key is not in the dictionary.</exception>
+		public TValue this[TKey key] {
+			get {
+				return values[dictionary[key]];
+			}
+			set {
+				int index;
+				if (dictionary.TryGetValue(key, out index)) {
+					values[index] = value;
+				}
+				else {
+					Add(key, value);
+				}
+			}
+		}
+
+		/// <summary>
+		/// Removes all key/value pairs from the dictionary.
+		/// </summary>
+		public void Clear () {
+			dictionary.Clear();
+			keys.Clear();
+			values.Clear();
+			++version;
+		}
+
+		/// <summary>
+		/// Gets the number of key/value pairs in the dictionary.
+		/// </summary>
+		public int Count {
+			get {
+				return dictionary.Count;
+			}
+		}
+
+		/// <summary>
+		/// Gets the key/value pairs in the dictionary in the order they were added.
+		/// </summary>
+		/// <returns>An enumerator over the key/value pairs in the dictionary.</returns>
+		public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator () {
+			int startVersion = version;
+			for (int index = 0; index != keys.Count; ++index) {
+				var key = keys[index];
+				var value = values[index];
+				yield return new KeyValuePair<TKey, TValue>(key, value);
+				if (version != startVersion) {
+					throw new InvalidOperationException(CollectionModifiedMessage);
+				}
+			}
+		}
+
+		int IList<KeyValuePair<TKey, TValue>>.IndexOf (KeyValuePair<TKey, TValue> item) {
+			int index;
+			if (dictionary.TryGetValue(item.Key, out index) && Equals(values[index], item.Value)) {
+				return index;
+			}
+			return -1;
+		}
+
+		void IList<KeyValuePair<TKey, TValue>>.Insert (int index, KeyValuePair<TKey, TValue> item) {
+			Insert(index, item.Key, item.Value);
+		}
+
+		KeyValuePair<TKey, TValue> IList<KeyValuePair<TKey, TValue>>.this[int index] {
+			get {
+				TKey key = keys[index];
+				TValue value = values[index];
+				return new KeyValuePair<TKey, TValue>(key, value);
+			}
+			set {
+				TKey key = keys[index];
+				if (dictionary.Comparer.Equals(key, value.Key)) {
+					dictionary[value.Key] = index;
+				}
+				else {
+					dictionary.Add(value.Key, index);  // will throw if key already exists
+					dictionary.Remove(key);
+				}
+				keys[index] = value.Key;
+				values[index] = value.Value;
+			}
+		}
+
+		ICollection<TKey> IDictionary<TKey, TValue>.Keys {
+			get {
+				return Keys;
+			}
+		}
+
+		ICollection<TValue> IDictionary<TKey, TValue>.Values {
+			get {
+				return Values;
+			}
+		}
+
+		void ICollection<KeyValuePair<TKey, TValue>>.Add (KeyValuePair<TKey, TValue> item) {
+			Add(item.Key, item.Value);
+		}
+
+		bool ICollection<KeyValuePair<TKey, TValue>>.Contains (KeyValuePair<TKey, TValue> item) {
+			int index;
+			if (dictionary.TryGetValue(item.Key, out index) && Equals(values[index], item.Value)) {
+				return true;
+			}
+			return false;
+		}
+
+		void ICollection<KeyValuePair<TKey, TValue>>.CopyTo (KeyValuePair<TKey, TValue>[] array, int arrayIndex) {
+			if (array == null) {
+				throw new ArgumentNullException("array");
+			}
+			if (arrayIndex < 0) {
+				throw new ArgumentOutOfRangeException("arrayIndex", arrayIndex, IndexOutOfRangeMessage);
+			}
+			for (int index = 0; index != keys.Count && arrayIndex < array.Length; ++index, ++arrayIndex) {
+				var key = keys[index];
+				var value = values[index];
+				array[arrayIndex] = new KeyValuePair<TKey, TValue>(key, value);
+			}
+		}
+
+		bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly {
+			get {
+				return false;
+			}
+		}
+
+		bool ICollection<KeyValuePair<TKey, TValue>>.Remove (KeyValuePair<TKey, TValue> item) {
+			ICollection<KeyValuePair<TKey, TValue>> self = this;
+			if (self.Contains(item)) {
+				return Remove(item.Key);
+			}
+			return false;
+		}
+
+		IEnumerator IEnumerable.GetEnumerator () {
+			return GetEnumerator();
+		}
+
+		/// <summary>
+		/// Wraps the keys in an OrderDictionary.
+		/// </summary>
+		public sealed class KeyCollection : ICollection<TKey>
+		{
+			private readonly Dictionary<TKey, int> dictionary;
+
+			/// <summary>
+			/// Initializes a new instance of a KeyCollection.
+			/// </summary>
+			/// <param name="dictionary">The OrderedDictionary whose keys to wrap.</param>
+			/// <exception cref="System.ArgumentNullException">The dictionary is null.</exception>
+			internal KeyCollection (Dictionary<TKey, int> dictionary) {
+				this.dictionary = dictionary;
+			}
+
+			/// <summary>
+			/// Copies the keys from the OrderedDictionary to the given array, starting at the given index.
+			/// </summary>
+			/// <param name="array">The array to copy the keys to.</param>
+			/// <param name="arrayIndex">The index into the array to start copying the keys.</param>
+			/// <exception cref="System.ArgumentNullException">The array is null.</exception>
+			/// <exception cref="System.ArgumentOutOfRangeException">The arrayIndex is negative.</exception>
+			/// <exception cref="System.ArgumentException">The array, starting at the given index, is not large enough to contain all the keys.</exception>
+			public void CopyTo (TKey[] array, int arrayIndex) {
+				dictionary.Keys.CopyTo(array, arrayIndex);
+			}
+
+			/// <summary>
+			/// Gets the number of keys in the OrderedDictionary.
+			/// </summary>
+			public int Count {
+				get {
+					return dictionary.Count;
+				}
+			}
+
+			/// <summary>
+			/// Gets an enumerator over the keys in the OrderedDictionary.
+			/// </summary>
+			/// <returns>The enumerator.</returns>
+			public IEnumerator<TKey> GetEnumerator () {
+				return dictionary.Keys.GetEnumerator();
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TKey>.Contains (TKey item) {
+				return dictionary.ContainsKey(item);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			void ICollection<TKey>.Add (TKey item) {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			void ICollection<TKey>.Clear () {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TKey>.IsReadOnly {
+				get {
+					return true;
+				}
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TKey>.Remove (TKey item) {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			IEnumerator IEnumerable.GetEnumerator () {
+				return GetEnumerator();
+			}
+		}
+
+		/// <summary>
+		/// Wraps the keys in an OrderDictionary.
+		/// </summary>
+		public sealed class ValueCollection : ICollection<TValue>
+		{
+			private readonly List<TValue> values;
+
+			/// <summary>
+			/// Initializes a new instance of a ValueCollection.
+			/// </summary>
+			/// <param name="values">The OrderedDictionary whose keys to wrap.</param>
+			/// <exception cref="System.ArgumentNullException">The dictionary is null.</exception>
+			internal ValueCollection (List<TValue> values) {
+				this.values = values;
+			}
+
+			/// <summary>
+			/// Copies the values from the OrderedDictionary to the given array, starting at the given index.
+			/// </summary>
+			/// <param name="array">The array to copy the values to.</param>
+			/// <param name="arrayIndex">The index into the array to start copying the values.</param>
+			/// <exception cref="System.ArgumentNullException">The array is null.</exception>
+			/// <exception cref="System.ArgumentOutOfRangeException">The arrayIndex is negative.</exception>
+			/// <exception cref="System.ArgumentException">The array, starting at the given index, is not large enough to contain all the values.</exception>
+			public void CopyTo (TValue[] array, int arrayIndex) {
+				values.CopyTo(array, arrayIndex);
+			}
+
+			/// <summary>
+			/// Gets the number of values in the OrderedDictionary.
+			/// </summary>
+			public int Count {
+				get {
+					return values.Count;
+				}
+			}
+
+			/// <summary>
+			/// Gets an enumerator over the values in the OrderedDictionary.
+			/// </summary>
+			/// <returns>The enumerator.</returns>
+			public IEnumerator<TValue> GetEnumerator () {
+				return values.GetEnumerator();
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TValue>.Contains (TValue item) {
+				return values.Contains(item);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			void ICollection<TValue>.Add (TValue item) {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			void ICollection<TValue>.Clear () {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TValue>.IsReadOnly {
+				get {
+					return true;
+				}
+			}
+
+			[EditorBrowsable(EditorBrowsableState.Never)]
+			bool ICollection<TValue>.Remove (TValue item) {
+				throw new NotSupportedException(EditReadOnlyListMessage);
+			}
+
+			IEnumerator IEnumerable.GetEnumerator () {
+				return GetEnumerator();
+			}
+		}
+	}
+
+	#if UNITY_EDITOR
+	internal class OrderedDictionaryDebugView<TKey, TValue>
+	{
+		private readonly OrderedDictionary<TKey, TValue> dictionary;
+
+		public OrderedDictionaryDebugView (OrderedDictionary<TKey, TValue> dictionary) {
+			this.dictionary = dictionary;
+		}
+
+		[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
+		public KeyValuePair<TKey, TValue>[] Items {
+			get {
+				return dictionary.ToArray();
+			}
+		}
+	}
+	#endif
+
+	/// <summary>
+	/// Provides extensions methods for constructing instances of <see cref="OrderedDictionary{TKey, TValue}"/>.
+	/// </summary>
+	public static class CollectionExtensions
+	{
+		#region ToOrderedDictionary
+
+		/// <summary>
+		/// Creates a new OrderedDictionary from the given collection, using the key selector to extract the key.
+		/// </summary>
+		/// <typeparam name="TSource">The type of the items in the collection.</typeparam>
+		/// <typeparam name="TKey">The type of the key.</typeparam>
+		/// <param name="source">The items to created the OrderedDictionary from.</param>
+		/// <param name="keySelector">A delegate that can extract a key from an item in the collection.</param>
+		/// <returns>An OrderedDictionary mapping the extracted keys to their values.</returns>
+		public static OrderedDictionary<TKey, TSource> ToOrderedDictionary<TSource, TKey> (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) {
+			return ToOrderedDictionary(source, keySelector, null);
+		}
+
+		/// <summary>
+		/// Creates a new OrderedDictionary from the given collection, using the key selector to extract the key.
+		/// The key comparer is passed to the OrderedDictionary for comparing the extracted keys.
+		/// </summary>
+		/// <typeparam name="TSource">The type of the items in the collection.</typeparam>
+		/// <typeparam name="TKey">The type of the key.</typeparam>
+		/// <param name="source">The items to created the OrderedDictionary from.</param>
+		/// <param name="keySelector">A delegate that can extract a key from an item in the collection.</param>
+		/// <param name="comparer">The key equality comparer to use to compare keys in the dictionary.</param>
+		/// <returns>An OrderedDictionary mapping the extracted keys to their values.</returns>
+		public static OrderedDictionary<TKey, TSource> ToOrderedDictionary<TSource, TKey> (
+			this IEnumerable<TSource> source,
+			Func<TSource, TKey> keySelector,
+			IEqualityComparer<TKey> comparer) {
+			if (source == null) {
+				throw new ArgumentNullException("source");
+			}
+			if (keySelector == null) {
+				throw new ArgumentNullException("keySelector");
+			}
+			var dictionary = new OrderedDictionary<TKey, TSource>(comparer);
+			foreach (TSource item in source) {
+				TKey key = keySelector(item);
+				dictionary.Add(key, item);
+			}
+			return dictionary;
+		}
+
+		#endregion
+	}
+}

spine-csharp/src/Skin.cs

@@ -30,7 +30,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Collections.Specialized;
+using Spine.Collections;
 
 namespace Spine {
 	/// <summary>Stores attachments by slot index and attachment name.
@@ -39,12 +39,12 @@ namespace Spine {
 	/// </summary>
 	public class Skin {
 		internal string name;
-		private OrderedDictionary attachments = new OrderedDictionary(SkinEntryComparer.Instance); // contains <SkinEntry, Attachment>
+		private OrderedDictionary<SkinEntry, Attachment> attachments = new OrderedDictionary<SkinEntry, Attachment>(SkinEntryComparer.Instance);
 		internal readonly ExposedList<BoneData> bones = new ExposedList<BoneData>();
 		internal readonly ExposedList<ConstraintData> constraints = new ExposedList<ConstraintData>();
 
 		public string Name { get { return name; } }
-		public OrderedDictionary Attachments { get { return attachments; } }
+		public OrderedDictionary<SkinEntry, Attachment> Attachments { get { return attachments; } }
 		public ExposedList<BoneData> Bones { get { return bones; } }
 		public ExposedList<ConstraintData> Constraints { get { return constraints; } }
 		
@@ -94,8 +94,9 @@ namespace Spine {
 		/// <returns>May be null.</returns>
 		public Attachment GetAttachment (int slotIndex, string name) {
 			var lookup = new SkinEntry(slotIndex, name, null);
-			var obj = attachments[lookup];
-			return (obj == null) ? null : (Attachment)obj;
+			Attachment attachment = null;
+			bool containsKey = attachments.TryGetValue(lookup, out attachment);
+			return containsKey ? attachment : null;
 		}
 
 		/// <summary> Removes the attachment in the skin for the specified slot index and name, if any.</summary>
@@ -106,11 +107,8 @@ namespace Spine {
 		}
 
 		///<summary>Returns all attachments contained in this skin.</summary>
-		public List<SkinEntry> GetAttachments () {
-			List<SkinEntry> entries = new List<SkinEntry>();
-			foreach (SkinEntry entry in this.attachments.Keys)
-				entries.Add(entry);
-			return entries;
+		public ICollection<SkinEntry> GetAttachments () {
+			return this.attachments.Keys;
 		}
 
 		/// <summary>Returns all attachments in this skin for the specified slot index.</summary>
@@ -178,19 +176,16 @@ namespace Spine {
 		}
 	
 		// Avoids boxing in the dictionary and is necessary to omit entry.attachment in the comparison.
-		class SkinEntryComparer : IEqualityComparer {
+		class SkinEntryComparer : IEqualityComparer<SkinEntry> {
 			internal static readonly SkinEntryComparer Instance = new SkinEntryComparer();
 
-			bool IEqualityComparer.Equals (object o1, object o2) {
-				var e1 = (SkinEntry)o1;
-				var e2 = (SkinEntry)o2;
+			bool IEqualityComparer<SkinEntry>.Equals (SkinEntry e1, SkinEntry e2) {
 				if (e1.SlotIndex != e2.SlotIndex) return false;
 				if (!string.Equals(e1.Name, e2.Name, StringComparison.Ordinal)) return false;
 				return true;
 			}
 
-			int IEqualityComparer.GetHashCode (object o) {
-				var e = (SkinEntry)o;
+			int IEqualityComparer<SkinEntry>.GetHashCode (SkinEntry e) {
 				return e.Name.GetHashCode() + e.SlotIndex * 37;
 			}
 		}

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Asset Types/SkeletonDataAssetInspector.cs

@@ -484,49 +484,32 @@ namespace Spine.Unity.Editor {
 					}
 				}
 
-				var slotAttachments = new List<Attachment>();
-				var slotAttachmentNames = new List<string>();
-				var defaultSkinAttachmentNames = new List<string>();
+				var slotAttachments = new List<Skin.SkinEntry>();
+				var defaultSkinAttachments = new List<Skin.SkinEntry>();
 				var slotsItems = preview.Skeleton.Slots.Items;
 				for (int i = preview.Skeleton.Slots.Count - 1; i >= 0; i--) {
 					Slot slot = slotsItems[i];
 					EditorGUILayout.LabelField(SpineInspectorUtility.TempContent(slot.Data.Name, Icons.slot));
 					if (showAttachments) {
 						slotAttachments.Clear();
-						slotAttachmentNames.Clear();
-						defaultSkinAttachmentNames.Clear();
+						defaultSkinAttachments.Clear();
 
 						using (new SpineInspectorUtility.IndentScope()) {
 							{
-								var skinEntries = new List<Skin.SkinEntry>();
-								skin.GetAttachments(i, skinEntries);
-								foreach (var entry in skinEntries) {
-									slotAttachments.Add(entry.Attachment);
-									slotAttachmentNames.Add(entry.Name);
-								}
-
+								skin.GetAttachments(i, slotAttachments);
 								if (skin != defaultSkin) {
-									skinEntries.Clear();
-									defaultSkin.GetAttachments(i, skinEntries);
-									foreach (var entry in skinEntries) {
-										slotAttachments.Add(entry.Attachment);
-										slotAttachmentNames.Add(entry.Name);
-										defaultSkinAttachmentNames.Add(entry.Name);
-									}
-
+									defaultSkin.GetAttachments(i, slotAttachments);
+									defaultSkin.GetAttachments(i, defaultSkinAttachments);
 								} else {
-									skinEntries.Clear();
-									defaultSkin.GetAttachments(i, skinEntries);
-									foreach (var entry in skinEntries) {
-										defaultSkinAttachmentNames.Add(entry.Name);
-									}
+									defaultSkin.GetAttachments(i, defaultSkinAttachments);
 								}
 							}
 
 							for (int a = 0; a < slotAttachments.Count; a++) {
-								Attachment attachment = slotAttachments[a];
-								string attachmentName = slotAttachmentNames[a];
-								bool attachmentIsFromSkin = !defaultSkinAttachmentNames.Contains(attachmentName);
+								var skinEntry = slotAttachments[a];
+								Attachment attachment = skinEntry.Attachment;
+								string attachmentName = skinEntry.Name;
+								bool attachmentIsFromSkin = !defaultSkinAttachments.Contains(skinEntry);
 
 								Texture2D attachmentTypeIcon = Icons.GetAttachmentIcon(attachment);
 								bool initialState = slot.Attachment == attachment;

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/PointFollowerInspector.cs

@@ -111,7 +111,7 @@ namespace Spine.Unity.Editor {
 		}
 
 		static void DrawPointsInSkin (Skin skin, Skeleton skeleton, Transform transform) {
-			foreach (DictionaryEntry skinEntry in skin.Attachments) {
+			foreach (var skinEntry in skin.Attachments) {
 				var attachment = skinEntry.Value as PointAttachment;
 				if (attachment != null) {
 					var skinKey = (Skin.SkinEntry)skinEntry.Key;

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonUtilityBoneInspector.cs

@@ -80,17 +80,13 @@ namespace Spine.Unity.Editor {
 			for(int i = 0; i < slotCount; i++){
 				Slot slot = skeletonUtility.skeletonRenderer.skeleton.Slots.Items[i];
 				if (slot.Bone == utilityBone.bone) {
-					var slotAttachments = new List<Attachment>();
-					var skinEntries = new List<Skin.SkinEntry>();
+					var slotAttachments = new List<Skin.SkinEntry>();
 					int slotIndex = skeleton.FindSlotIndex(slot.Data.Name);
-					skin.GetAttachments(slotIndex, skinEntries);
-					foreach (var entry in skinEntries) {
-						slotAttachments.Add(entry.Attachment);
-					}
-
+					skin.GetAttachments(slotIndex, slotAttachments);
+					
 					var boundingBoxes = new List<BoundingBoxAttachment>();
 					foreach (var att in slotAttachments) {
-						var boundingBoxAttachment = att as BoundingBoxAttachment;
+						var boundingBoxAttachment = att.Attachment as BoundingBoxAttachment;
 						if (boundingBoxAttachment != null)
 							boundingBoxes.Add(boundingBoxAttachment);
 					}

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBaker.cs

@@ -339,28 +339,14 @@ namespace Spine.Unity.Editor {
 					slotTransform.parent = prefabRoot.transform;
 					slotTable.Add(slotData.Name, slotTransform);
 
-					List<Attachment> attachments = new List<Attachment>();
-					List<string> attachmentNames = new List<string>();
-
 					var skinEntries = new List<Skin.SkinEntry>();
 					skin.GetAttachments(slotIndex, skinEntries);
-					foreach (var entry in skinEntries) {
-						attachments.Add(entry.Attachment);
-						attachmentNames.Add(entry.Name);
-					}
-
-					if (skin != skeletonData.DefaultSkin) {
-						skinEntries.Clear();
+					if (skin != skeletonData.DefaultSkin)
 						skeletonData.DefaultSkin.GetAttachments(slotIndex, skinEntries);
-						foreach (var entry in skinEntries) {
-							attachments.Add(entry.Attachment);
-							attachmentNames.Add(entry.Name);
-						}
-					}
 
-					for (int a = 0; a < attachments.Count; a++) {
-						var attachment = attachments[a];
-						string attachmentName = attachmentNames[a];
+					for (int a = 0; a < skinEntries.Count; a++) {
+						var attachment = skinEntries[a].Attachment;
+						string attachmentName = skinEntries[a].Name;
 						string attachmentMeshName = "[" + slotData.Name + "] " + attachmentName;
 						Vector3 offset = Vector3.zero;
 						float rotation = 0;

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonDebugWindow.cs

@@ -84,7 +84,7 @@ namespace Spine.Unity.Editor {
 		[SpineBone(dataField:"skeletonRenderer")]
 		public string boneName;
 
-		readonly Dictionary<Slot, List<Attachment>> attachmentTable = new Dictionary<Slot, List<Attachment>>();
+		readonly Dictionary<Slot, List<Skin.SkinEntry>> attachmentTable = new Dictionary<Slot, List<Skin.SkinEntry>>();
 
 		static bool staticLostValues = true;
 
@@ -338,7 +338,7 @@ namespace Spine.Unity.Editor {
 						}
 
 						int baseIndent = EditorGUI.indentLevel;
-						foreach (KeyValuePair<Slot, List<Attachment>> pair in attachmentTable) {
+						foreach (KeyValuePair<Slot, List<Skin.SkinEntry>> pair in attachmentTable) {
 							Slot slot = pair.Key;
 
 							using (new EditorGUILayout.HorizontalScope()) {
@@ -352,7 +352,8 @@ namespace Spine.Unity.Editor {
 								}
 							}
 
-							foreach (var attachment in pair.Value) {
+							foreach (var skinEntry in pair.Value) {
+								var attachment = skinEntry.Attachment;
 								GUI.contentColor = slot.Attachment == attachment ? Color.white : Color.grey;
 								EditorGUI.indentLevel = baseIndent + 2;
 								var icon = Icons.GetAttachmentIcon(attachment);
@@ -577,21 +578,12 @@ namespace Spine.Unity.Editor {
 
 			attachmentTable.Clear();
 			for (int i = skeleton.Slots.Count - 1; i >= 0; i--) {
-				var attachments = new List<Attachment>();
+				var attachments = new List<Skin.SkinEntry>();
 				attachmentTable.Add(skeleton.Slots.Items[i], attachments);
 				// Add skin attachments.
-				var skinEntries = new List<Skin.SkinEntry>();
-				skin.GetAttachments(i, skinEntries);
-				foreach (var entry in skinEntries) {
-					attachments.Add(entry.Attachment);
-				}
-				if (notDefaultSkin) { // Add default skin attachments.
-					skinEntries.Clear();
-					defaultSkin.GetAttachments(i, skinEntries);
-					foreach (var entry in skinEntries) {
-						attachments.Add(entry.Attachment);
-					}
-				}
+				skin.GetAttachments(i, attachments);
+				if (notDefaultSkin) // Add default skin attachments.
+					defaultSkin.GetAttachments(i, attachments);
 			}
 
 			activeSkin = skeleton.Skin;

spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs

@@ -333,9 +333,9 @@ namespace Spine.Unity.AttachmentTools {
 			var originalRegions = new List<AtlasRegion>();
 			int newRegionIndex = 0;
 			
-			foreach (DictionaryEntry skinEntry in skinAttachments) {
-				var originalKey = (Skin.SkinEntry)skinEntry.Key;
-				var originalAttachment = (Attachment)skinEntry.Value;
+			foreach (var skinEntry in skinAttachments) {
+				var originalKey = skinEntry.Key;
+				var originalAttachment = skinEntry.Value;
 
 				Attachment newAttachment;
 				if (IsRenderable(originalAttachment)) {

spine-unity/Assets/Spine/Runtime/spine-unity/Utility/SkinUtilities.cs

@@ -74,7 +74,7 @@ namespace Spine.Unity.AttachmentTools {
 			var newSkin = new Skin(original.name + " clone");
 			var newSkinAttachments = newSkin.Attachments;
 
-			foreach (DictionaryEntry a in original.Attachments)
+			foreach (var a in original.Attachments)
 				newSkinAttachments[a.Key] = a.Value;
 
 			return newSkin;
@@ -129,21 +129,21 @@ namespace Spine.Unity.AttachmentTools {
 
 			if (cloneAttachments) {
 				if (overwrite) {
-					foreach (DictionaryEntry e in sourceAttachments)
-						destinationAttachments[e.Key] = ((Attachment)e.Value).GetCopy(cloneMeshesAsLinked);
+					foreach (var e in sourceAttachments)
+						destinationAttachments[e.Key] = e.Value.GetCopy(cloneMeshesAsLinked);
 				} else {
-					foreach (DictionaryEntry e in sourceAttachments) {
-						if (destinationAttachments.Contains(e.Key)) continue;
-						destinationAttachments.Add(e.Key, ((Attachment)e.Value).GetCopy(cloneMeshesAsLinked));
+					foreach (var e in sourceAttachments) {
+						if (destinationAttachments.ContainsKey(e.Key)) continue;
+						destinationAttachments.Add(e.Key, e.Value.GetCopy(cloneMeshesAsLinked));
 					}
 				}
 			} else {
 				if (overwrite) {
-					foreach (DictionaryEntry e in sourceAttachments)
+					foreach (var e in sourceAttachments)
 						destinationAttachments[e.Key] = e.Value;
 				} else {
-					foreach (DictionaryEntry e in sourceAttachments) {
-						if (destinationAttachments.Contains(e.Key)) continue;
+					foreach (var e in sourceAttachments) {
+						if (destinationAttachments.ContainsKey(e.Key)) continue;
 						destinationAttachments.Add(e.Key, e.Value);
 					}
 				}