【a】XNode

Assets/10.XNode/Scripts/Editor/Drawers/NodeEnumDrawer.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using XNode;
+using XNodeEditor;
+
+namespace XNodeEditor {
+	[CustomPropertyDrawer(typeof(NodeEnumAttribute))]
+	public class NodeEnumDrawer : PropertyDrawer {
+		public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
+			EditorGUI.BeginProperty(position, label, property);
+
+			EnumPopup(position, property, label);
+
+			EditorGUI.EndProperty();
+		}
+
+		public static void EnumPopup(Rect position, SerializedProperty property, GUIContent label) {
+			// Throw error on wrong type
+			if (property.propertyType != SerializedPropertyType.Enum) {
+				throw new ArgumentException("Parameter selected must be of type System.Enum");
+			}
+
+			// Add label
+			position = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
+
+			// Get current enum name
+			string enumName = "";
+			if (property.enumValueIndex >= 0 && property.enumValueIndex < property.enumDisplayNames.Length) enumName = property.enumDisplayNames[property.enumValueIndex];
+
+#if UNITY_2017_1_OR_NEWER
+			// Display dropdown
+			if (EditorGUI.DropdownButton(position, new GUIContent(enumName), FocusType.Passive)) {
+				// Position is all wrong if we show the dropdown during the node draw phase.
+				// Instead, add it to onLateGUI to display it later.
+				NodeEditorWindow.current.onLateGUI += () => ShowContextMenuAtMouse(property);
+			}
+#else
+			// Display dropdown
+			if (GUI.Button(position, new GUIContent(enumName), "MiniPopup")) {
+				// Position is all wrong if we show the dropdown during the node draw phase.
+				// Instead, add it to onLateGUI to display it later.
+				NodeEditorWindow.current.onLateGUI += () => ShowContextMenuAtMouse(property);
+			}
+#endif
+		}
+
+		public static void ShowContextMenuAtMouse(SerializedProperty property) {
+			// Initialize menu
+			GenericMenu menu = new GenericMenu();
+
+			// Add all enum display names to menu
+			for (int i = 0; i < property.enumDisplayNames.Length; i++) {
+				int index = i;
+				menu.AddItem(new GUIContent(property.enumDisplayNames[i]), false, () => SetEnum(property, index));
+			}
+
+			// Display at cursor position
+			Rect r = new Rect(Event.current.mousePosition, new Vector2(0, 0));
+			menu.DropDown(r);
+		}
+
+		private static void SetEnum(SerializedProperty property, int index) {
+			property.enumValueIndex = index;
+			property.serializedObject.ApplyModifiedProperties();
+			property.serializedObject.Update();
+		}
+	}
+}