Wire up a C# code-behind file to a NoesisGUI XAML file automatically, by convention and reflection

NoesisXamlCodeBehind

//#define TRACE_XamlCodeBehind
#define WARN_XamlCodeBehind

// Installation Recommendation: Place this file as a loose C# file in your Unity Assets tree.
// Copyright: placed in Public Domain by Jared Thirsk, 2015

// Note: Noesis plans to add code-behind support.  Once they do this, this file should become obsolete.
// Created for NoesisGUI 1.2.3

using Noesis;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using UnityEngine;


public class XamlCodeBehind : MonoBehaviour
{
    public string CodeBehindClass;

    private FrameworkElement content;
    private object codebehindObject;
    NoesisGUIPanel noesisGUI;

    void Start()
    {
        #region NoesisGUI

        noesisGUI = GetComponent<NoesisGUIPanel>();
        if (noesisGUI == null)
        {
            UnityEngine.Debug.LogWarning("[XamlCodeBehind] No NoesisGUIPanel attached to this object.  Nothing for a XamlCodeBehind class to bind to.");
            return;
        }

        var subpath = noesisGUI._xamlFile;
        var filename = System.IO.Path.GetFileNameWithoutExtension(subpath);

#if TRACE_XamlCodeBehind
        UnityEngine.Debug.Log("XamlFile: " + filename);
#endif

        if (String.IsNullOrEmpty(CodeBehindClass))
        {
#if trueX
            string defaultNamespacePrefix = "LionFire.Gaxastar.Views.";
            CodeBehindClass = defaultNamespacePrefix + filename;
#else
            CodeBehindClass = filename;
#endif
        }

        #endregion

        content = noesisGUI.GetContent();

        if(content==null)
        {
            UnityEngine.Debug.LogError("Failed to get NoesisGUI content for " + noesisGUI._xamlFile);
            return;
        }
#if TRACE_XamlCodeBehind
        else{
        UnityEngine.Debug.Log("Got NoesisGUI content: " + (content == null ? "null" : content.GetType().FullName));
        }
#endif

        try
        {
            Type codebehindType = Type.GetType(CodeBehindClass);

            if (content == null)
            {
                UnityEngine.Debug.LogError("Failed to get codebehind type for " + noesisGUI._xamlFile);
                return;
            }
#if TRACE_XamlCodeBehind
            else{
            UnityEngine.Debug.Log("[XamlCodeBehind] Got code behind Type: " + (codebehindType == null ? "" : codebehindType.FullName));
            }
#endif
            codebehindObject = Activator.CreateInstance(codebehindType, new object[] { content });

            foreach (var methodInfo in codebehindType.GetMethods(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
            {

                if (!methodInfo.Name.Contains('_')) continue;
                if (methodInfo.Name == "obj_address") continue;
                var chunks = methodInfo.Name.Split('_');
                if (chunks.Length != 2) continue;
                if (chunks[0] == "get" || chunks[0] == "set") continue;
                if (chunks[0] == "add" || chunks[0] == "remove") continue;

                object target = content.FindName(chunks[0]);

                if (target == null)
                {
#if WARN_XamlCodeBehind
                    UnityEngine.Debug.LogWarning("[CODEBEHIND] Did not find element: " + chunks[0] + " for method: " + methodInfo.Name);
#endif
                    continue;
                }
#if TRACE_XamlCodeBehind
                else
                {
                    UnityEngine.Debug.Log("[codebehind] Found element: " + chunks[0]);
                }
#endif

                var eventInfo = target.GetType().GetEvent(chunks[1], BindingFlags.Public | BindingFlags.Instance | BindingFlags.FlattenHierarchy);

                if (eventInfo == null)
                {
#if WARN_XamlCodeBehind
                    UnityEngine.Debug.LogWarning("[CODEBEHIND] Did not find event: " + chunks[1] + " for method: " + methodInfo.Name + " on type " + target.GetType().FullName);
#endif
                    continue;
                }
#if TRACE_XamlCodeBehind
                else
                {
                    UnityEngine.Debug.Log("[codebehind] Found event: " + chunks[1]);
                }
#endif

                Delegate del = Delegate.CreateDelegate(eventInfo.EventHandlerType, codebehindObject, methodInfo);
                try
                {
                    eventInfo.AddEventHandler(target, del);
                }
                catch (Exception ex)
                {
                    UnityEngine.Debug.LogError("[CODEBEHIND] Failed to attach event for method: " + methodInfo.Name + ". Event type: " + eventInfo.EventHandlerType.FullName + ", Delegate type: " + del.GetType().FullName + ", Delegate return type: " + methodInfo.ReturnType + " with parameter types: " + methodInfo.GetParameters().Select(p => p.ParameterType.FullName).Aggregate((x, y) => x + ", " + y) + " Exception: " + ex);
                }
            }
        }
        catch (Exception ex)
        {
            UnityEngine.Debug.LogError("[CODEBEHIND] " + ex);
        }
    }
}