Items are now listed directly in the root when there is only one namespace.

Author: mackysoft

Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/AdvancedTypePopup.cs

@@ -23,6 +23,8 @@ public AdvancedTypePopupItem (Type type,string name) : base(name) {
 	/// </summary>
 	public class AdvancedTypePopup : AdvancedDropdown {
 
+		const int kMaxNamespaceNestCount = 16;
+
 		public static void AddTo (AdvancedDropdownItem root,IEnumerable<Type> types) {
 			int itemCount = 0;
 
@@ -32,8 +34,31 @@ public static void AddTo (AdvancedDropdownItem root,IEnumerable<Type> types) {
 			};
 			root.AddChild(nullItem);
 
+			Type[] typeArray = types.OrderByType().ToArray();
+
+			// Single namespace if the root has one namespace and the nest is unbranched.
+			bool isSingleNamespace = true;
+			string[] namespaces = new string[kMaxNamespaceNestCount];
+			foreach (Type type in typeArray) {
+				string[] splittedTypePath = TypeMenuUtility.GetSplittedTypePath(type);
+				if (splittedTypePath.Length <= 1) {
+					continue;
+				}
+				for (int k = 0;(splittedTypePath.Length - 1) > k;k++) {
+					string ns = namespaces[k];
+					if (ns == null) {
+						namespaces[k] = splittedTypePath[k];
+					}
+					else if (ns != splittedTypePath[k]) {
+						
+						isSingleNamespace = false;
+						break;
+					}
+				}
+			}
+
 			// Add type items.
-			foreach (Type type in types.OrderByType()) {
+			foreach (Type type in typeArray) {
 				string[] splittedTypePath = TypeMenuUtility.GetSplittedTypePath(type);
 				if (splittedTypePath.Length == 0) {
 					continue;
@@ -42,16 +67,19 @@ public static void AddTo (AdvancedDropdownItem root,IEnumerable<Type> types) {
 				AdvancedDropdownItem parent = root;
 
 				// Add namespace items.
-				for (int k = 0;(splittedTypePath.Length - 1) > k;k++) {
-					AdvancedDropdownItem foundItem = GetItem(parent,splittedTypePath[k]);
-					if (foundItem != null) {
-						parent = foundItem;
-					} else {
-						var newItem = new AdvancedDropdownItem(splittedTypePath[k]) {
-							id = itemCount++,
-						};
-						parent.AddChild(newItem);
-						parent = newItem;
+				if (!isSingleNamespace) {
+					for (int k = 0;(splittedTypePath.Length - 1) > k;k++) {
+						AdvancedDropdownItem foundItem = GetItem(parent,splittedTypePath[k]);
+						if (foundItem != null) {
+							parent = foundItem;
+						}
+						else {
+							var newItem = new AdvancedDropdownItem(splittedTypePath[k]) {
+								id = itemCount++,
+							};
+							parent.AddChild(newItem);
+							parent = newItem;
+						}
 					}
 				}