fungus/Assets/Fungus/Flowchart/Editor/EventHandlerEditor.cs

using UnityEditor;
using UnityEditorInternal;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

namespace Fungus
{

	[CustomEditor (typeof(EventHandler), true)]
	public class EventHandlerEditor : Editor 
	{
		/**
		 * Returns the class attribute info for an event handler class.
		 */
		public static EventHandlerInfoAttribute GetEventHandlerInfo(System.Type eventHandlerType)
		{
			object[] attributes = eventHandlerType.GetCustomAttributes(typeof(EventHandlerInfoAttribute), false);
			foreach (object obj in attributes)
			{
				EventHandlerInfoAttribute eventHandlerInfoAttr = obj as EventHandlerInfoAttribute;
				if (eventHandlerInfoAttr != null)
				{
					return eventHandlerInfoAttr;
				}
			}
			
			return null;
		}

		public virtual void DrawInspectorGUI()
		{
			// Users should not be able to change the MonoScript for the command using the usual Script field.
			// Doing so could cause block.commandList to contain null entries.
			// To avoid this we manually display all properties, except for m_Script.
			serializedObject.Update();
			SerializedProperty iterator = serializedObject.GetIterator();
			bool enterChildren = true;
			while (iterator.NextVisible(enterChildren))
			{
				enterChildren = false;
				
				if (iterator.name == "m_Script")
				{
					continue;
				}
				
				EditorGUILayout.PropertyField(iterator, true, new GUILayoutOption[0]);
			}

			EventHandler t = target as EventHandler;
			EventHandlerInfoAttribute info = EventHandlerEditor.GetEventHandlerInfo(t.GetType());
			if (info != null &&
			    info.HelpText.Length > 0)
			{
				EditorGUILayout.HelpBox(info.HelpText, MessageType.Info);
			}

			serializedObject.ApplyModifiedProperties();
		}
	}

}