ProjectDDD/Packages/SLUnity/SLUI/SLUIPositionToScreen.cs

using UnityEngine;

namespace Superlazy.UI
{
    public class SLUIPositionToScreen : SLUIComponent
    {
        public string bind = "Position";

        private RectTransform t;
        private Camera canvasCamera;
        private RectTransform canvasTrasnfrom;

        protected override void Validate()
        {
            t = GetComponent<RectTransform>();
        }

        protected override void Init()
        {
            var canvas = GetComponentInParent<Canvas>();
            canvasCamera = canvas.worldCamera;
            canvasTrasnfrom = canvas.GetComponent<RectTransform>();
        }

        protected override void Enable()
        {
            SLGame.AddNotify(bindParent.BindPath.CombinePath(bind), OnChange);
        }

        protected override void Disable()
        {
            SLGame.RemoveNotify(bindParent.BindPath.CombinePath(bind), OnChange);
        }

        private void OnChange()
        {
            if (bindParent.Active == false) return;

            Vector3 screenPosition = SLGame.Camera.WorldToScreenPoint(SLGame.SessionGet(bindParent.BindPath).Get(bind).ToVector3());

            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasTrasnfrom, screenPosition, canvasCamera, out Vector2 localPoint))
            {
                t.anchoredPosition = localPoint;
            }
        }
    }
}