Tri-Inspector/Editor/Elements/TriHorizontalGroupElement.cs

using UnityEngine;

namespace TriInspector.Elements
{
    public class TriHorizontalGroupElement : TriPropertyCollectionBaseElement
    {
        public override float GetHeight(float width)
        {
            if (ChildrenCount == 0)
            {
                return 0f;
            }

            var height = 0f;

            for (var i = 0; i < ChildrenCount; i++)
            {
                var child = GetChild(i);
                var childWidth = width / ChildrenCount;
                var childHeight = child.GetHeight(childWidth);

                height = Mathf.Max(height, childHeight);
            }

            return height;
        }

        public override void OnGUI(Rect position)
        {
            if (ChildrenCount == 0)
            {
                return;
            }

            var childWidth = position.width / ChildrenCount;

            for (var i = 0; i < ChildrenCount; i++)
            {
                var child = GetChild(i);
                var childRect = new Rect(position)
                {
                    width = childWidth,
                    x = position.x + i * childWidth,
                };

                child.OnGUI(childRect);
            }
        }
    }
}