自動的にスクロールバーが隠れるScrollRect

AutoHideScrollRect.cs

using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections.Generic;
using DG.Tweening;

public class AutoHideScrollRect : ScrollRect
{
    public List<Image> bars = new List<Image>();

    float beginDuration = 0.5f;
    float endDuration = 1.0f;

    new void Start()
    {
        base.Start();

        if (vertical)
        {
            bars.AddRange(verticalScrollbar.GetComponentsInChildren<Image>());
        }
        if (horizontal)
        {
            bars.AddRange(horizontalScrollbar.GetComponentsInChildren<Image>());
        }
    }

    public override void OnBeginDrag(PointerEventData eventData)
    {
        base.OnBeginDrag(eventData);

        foreach (var img in bars)
        {
            img.DOFade(1, beginDuration);
        }
    }

    public override void OnEndDrag(PointerEventData eventData)
    {
        base.OnEndDrag(eventData);

        foreach (var img in bars)
        {
            img.DOFade(0, endDuration);
        }
    }
}