LayoutMaxSize.cs

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using System;
using UnityEngine;
using UnityEngine.UI;
 
[Serializable]
[RequireComponent(typeof(RectTransform))]
public class LayoutMaxSize : LayoutElement
{
    public float maxHeight = -1f;
 
    public float maxWidth = -1f;
 
    public override void CalculateLayoutInputHorizontal()
    {
        base.CalculateLayoutInputHorizontal();
        UpdateMaxSizes();
    }
 
    public override void CalculateLayoutInputVertical()
    {
        base.CalculateLayoutInputVertical();
        UpdateMaxSizes();
    }
 
    protected override void OnRectTransformDimensionsChange()
    {
        base.OnRectTransformDimensionsChange();
        UpdateMaxSizes();
    }
 
    private void UpdateMaxSizes()
    {
        if (maxWidth != -1f)
        {
            RectTransform rectTransform = this.Rect();
            if (rectTransform.sizeDelta.x > maxWidth)
            {
                rectTransform.sizeDelta = new Vector2(maxWidth, rectTransform.sizeDelta.y);
                preferredWidth = maxWidth;
            }
        }
    }
}