Major_Project_B/Assets/Scripts/UI/BagItem.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class BagItem : Dragable
{

    [SerializeField]
    protected LogicBlock logicElement;

    protected LogicTrayUI tray;
    protected RectTransform trayRect;

    private bool isHovered;

    public override void OnBeginDrag(PointerEventData eventData)
    {
        base.OnBeginDrag(eventData);
        tray = FindObjectOfType<LogicTrayUI>();
        if (tray != null)
            trayRect = (tray.transform as RectTransform);
    }


    public override void OnDrag(PointerEventData data)
    {
        base.OnDrag(data);
        DoTrayLogic(data);

        string output = "";
        foreach (GameObject hover in data.hovered)
            output += hover.name + " ";
        Debug.Log(output);

    }

    protected virtual void DoTrayLogic(PointerEventData data)
    {
        if (trayRect == null)
            return;

        var rt = m_DraggingIcon.GetComponent<RectTransform>();
 

        if (GetWorldSpaceRect(trayRect).Overlaps(GetWorldSpaceRect(rt)))
        {
            if (!isHovered)
            {
                tray.OnHoverStart(this, rt);
                isHovered = true;
            }
            tray.OnHoverUpdate(this, rt);
        }else if (isHovered)
        {
            isHovered = false;
            tray.OnHoverEnd(this);
        }
            
    }

    public override void OnEndDrag(PointerEventData eventData)
    {
        base.OnEndDrag(eventData);

        if (isHovered)
        {
            isHovered = false;
            tray.InsertLogicElement(logicElement);
            tray.OnHoverEnd(this);
        }
    }



    private void drawRect(RectTransform transform,Color color,bool global = true)
    {
        Rect rect = transform.rect;
        if (global)
            rect = GetWorldSpaceRect(transform);

        Debug.DrawLine(new Vector3(rect.min.x,rect.max.y,0), new Vector3(rect.max.x, rect.max.y, 0), color);
        Debug.DrawLine(new Vector3(rect.max.x, rect.max.y, 0), new Vector3(rect.max.x, rect.min.y, 0), color);
        Debug.DrawLine(new Vector3(rect.max.x, rect.min.y, 0), new Vector3(rect.min.x, rect.min.y, 0), color);
        Debug.DrawLine(new Vector3(rect.min.x, rect.min.y, 0), new Vector3(rect.min.x, rect.max.y, 0), color);
    }

    Rect GetWorldSpaceRect(RectTransform rt)
    {
        var r = rt.rect;

        Vector2 centre = rt.TransformPoint(r.center);
        r.size = rt.TransformVector(r.size);
        r.center = centre;
        return r;
    }

}