ShowUnityIconsWnd

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using UnityEngine;
using UnityEditor;
using System;
using System.Linq;
using System.Reflection;

class ShowUnityIconsWnd : EditorWindow
{
	[MenuItem("Tools/ShowUnityBuildInIcons")]
	public static void ShowWindow()
	{
		EditorWindow.GetWindow(typeof(ShowUnityIconsWnd));
	}

	private string search = "UI";
	List<Texture2D> builtInTexs = new List<Texture2D>();
	Dictionary<Texture,bool>  dict= new Dictionary<Texture, bool>();
	void GetBultinAsset()
	{
		dict.Clear();
		builtInTexs.Clear();
		var flags = BindingFlags.Static | BindingFlags.NonPublic;
		var info = typeof(EditorGUIUtility).GetMethod("GetEditorAssetBundle", flags);
		var bundle = info.Invoke(null, new object[0]) as AssetBundle;
		UnityEngine.Object[] objs = bundle.LoadAllAssets<Texture>();
		if (null != objs)
		{
			for (int i = 0; i < objs.Length; i++)
			{
				if (objs[i] is Texture2D)
				{
					var texture = objs[i] as Texture2D;
					
					if (!dict.ContainsKey(texture))
					{
						builtInTexs.Add(texture);
						dict.Add(texture,true);
					}
					
				}
			}
		}
	}
 
	void Awake()
	{
		GetBultinAsset();
	}
 
	Vector2 scrollPos = Vector2.zero;
	private const int LINE_HEIGHT = 40;
	void OnGUI()
	{
		GUILayout.BeginHorizontal();
		search = EditorGUILayout.TextField("search ", search);
		EditorGUILayout.Vector3Field("scrollPos",scrollPos);
		GUILayout.EndHorizontal();
		GUILayout.Label("TotalItem :  "+builtInTexs.Count);
		
		
		scrollPos = EditorGUILayout.BeginScrollView(scrollPos);
		int drawIndex = 0;
		for (int i = 0; i < builtInTexs.Count; i++)
		{
			var texture = builtInTexs[i];
		
			if (string.IsNullOrEmpty(search) == false && texture.name.Contains(search)==false)
			{
				continue;
			}

			if (IsVisible(drawIndex))
			{
				GUILayout.BeginHorizontal();
				GUILayout.Box(texture,GUILayout.Width(LINE_HEIGHT),GUILayout.Height(LINE_HEIGHT));
				GUILayout.Label("Index: "+drawIndex,GUILayout.Width(100));
				EditorGUILayout.TextField(texture.name);
				EditorGUILayout.ObjectField(texture, typeof(Texture2D));
				GUILayout.EndHorizontal();
				
			}
			else
			{
				//those not visible item only need to take space 
				GUILayout.Space(LINE_HEIGHT);
			}
			drawIndex++;


		}
		EditorGUILayout.EndScrollView();
	}

	bool IsVisible(int index)
	{
		var pos = index * LINE_HEIGHT;
		if (pos >= scrollPos.y && pos < scrollPos.y + position.height)
		{
			return true;
		}

		return false;
	}
}