ScrollIndexCallback1

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

public class ScrollIndexCallback1 : MonoBehaviour 
{
    private static readonly int MainTex = Shader.PropertyToID("_MainTex");
    
    public Image image;
	public Text text;

	private Material _backupMaterial;
	private Material _spawnMaterial;

	private string _headName;
	private string _imageURL;

	private string _guid;
	
	private static List<ScrollerData> _data = new List<ScrollerData>(10);

	static ScrollIndexCallback1()
	{
		_data.Add(new ScrollerData() { textName = "1", url = "http://localhost:8000/1.png"});
		_data.Add(new ScrollerData() { textName = "2", url = "http://localhost:8000/2.png"});
		_data.Add(new ScrollerData() { textName = "3", url = "http://localhost:8000/3.png"});
		_data.Add(new ScrollerData() { textName = "4", url = "http://localhost:8000/4.png"});
		_data.Add(new ScrollerData() { textName = "5", url = "http://localhost:8000/5.png"});
		_data.Add(new ScrollerData() { textName = "6", url = "http://localhost:8000/6.png"});
		_data.Add(new ScrollerData() { textName = "7", url = "http://localhost:8000/7.png"});
		_data.Add(new ScrollerData() { textName = "8", url = "http://localhost:8000/8.png"});
		_data.Add(new ScrollerData() { textName = "9", url = "http://localhost:8000/9.png"});
		_data.Add(new ScrollerData() { textName = "10", url = "http://localhost:8000/10.png"});
	}
	
	

    void ScrollCellIndex (int idx)
    {
	    var data = _data[idx];

	    SetData(data);
    }
    
    private void Awake()
    {
	    _guid = Guid.NewGuid().ToString();
    }

    private void OnDisable()
    {
	    DestroyMaterial();
	    OnPropertyChange(null, null);
    }

    private void OnPropertyChange(string newHeadName, string newImageURL)
    {
	    SetHeadName(newHeadName);
	    SetMaterialImage(newImageURL);
    }
    
    private void SetHeadName(string newHeadName)
    {
	    if (newHeadName != _headName)
	    {
		    _headName = newHeadName;
		    text.text = _headName;
	    }
    }
    
    private void SetMaterialImage(string newImageURL)
    {
	    if (_imageURL == newImageURL)
		    return;
        
	    if (_imageURL != null)
	    {
		    ResourceManager.Instance.DestroyWebTexture(_imageURL, _guid);
	    }
        
	    _imageURL = newImageURL;
        
	    if (_imageURL != null)
	    {
		    ResourceManager.Instance.GetWebTexture(_imageURL, _guid)
			    .Then(texture =>
			    {
				    SpawnMaterial();
                    
				    image.material.SetTexture(MainTex, texture);
				    image.SetMaterialDirty();
			    })
			    .Catch(ex =>
			    {
				    /*Debug.LogException(ex);*/
			    });
	    }
    }

    private void SpawnMaterial()
    {
	    if (_spawnMaterial == null)
	    {
		    var material = image.material;
		    _backupMaterial = material;
		    _spawnMaterial = new Material(material);

		    image.material = _spawnMaterial;
		    image.SetMaterialDirty();
	    }
    }

    private void DestroyMaterial()
    {
	    if (_spawnMaterial != null)
	    {
		    Destroy(_spawnMaterial);
		    _spawnMaterial = null;

		    image.material = _backupMaterial;
		    image.SetMaterialDirty();
	    }
    }

    public void SetData(ScrollerData data)
    {
	    OnPropertyChange(data.textName, data.url);
    }
}