ScrollbarHandleSize.cs

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using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
 
namespace Mosframe;
 
[DisallowMultipleComponent]
[RequireComponent(typeof(ScrollRect))]
public class ScrollbarHandleSize : UIBehaviour
{
    public float maxSize = 1f;
 
    public float minSize = 0.1f;
 
    private ScrollRect scrollRect;
 
    protected override void Awake()
    {
        base.Awake();
        scrollRect = GetComponent<ScrollRect>();
    }
 
    protected override void OnEnable()
    {
        scrollRect.onValueChanged.AddListener(onValueChanged);
    }
 
    protected override void OnDisable()
    {
        scrollRect.onValueChanged.RemoveListener(onValueChanged);
    }
 
    public void onValueChanged(Vector2 value)
    {
        Scrollbar horizontalScrollbar = scrollRect.horizontalScrollbar;
        if (horizontalScrollbar != null)
        {
            if (horizontalScrollbar.size > maxSize)
            {
                horizontalScrollbar.size = maxSize;
            }
            else if (horizontalScrollbar.size < minSize)
            {
                horizontalScrollbar.size = minSize;
            }
        }
        Scrollbar verticalScrollbar = scrollRect.verticalScrollbar;
        if (verticalScrollbar != null)
        {
            if (verticalScrollbar.size > maxSize)
            {
                verticalScrollbar.size = maxSize;
            }
            else if (verticalScrollbar.size < minSize)
            {
                verticalScrollbar.size = minSize;
            }
        }
    }
}