Tri-Inspector/Editor.Extras/Drawers/IndentDrawer.cs

using TriInspector;
using TriInspector.Drawers;
using TriInspector.Utilities;
using UnityEngine;

[assembly: RegisterTriAttributeDrawer(typeof(IndentDrawer), TriDrawerOrder.Decorator)]

namespace TriInspector.Drawers
{
    public class IndentDrawer : TriAttributeDrawer<IndentAttribute>
    {
        public override void OnGUI(Rect position, TriProperty property, TriElement next)
        {
            TriGuiHelper.PushIndentLevel(Attribute.Indent);
            next.OnGUI(position);
            TriGuiHelper.PopIndentLevel();
        }
    }
}