Room-builder/Assets/Scripts/Ground/BuildingGridNode.cs

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

public class BuildingGridNode {

    GridXZ<BuildingGridNode> grid;
    int x, z;
    private Transform transform;
    public BuildingGridNode(GridXZ<BuildingGridNode> grid, int x, int z) {
        this.grid = grid;
        this.x = x;
        this.z = z;
    }

    public void SetTransform(Transform transform) {
        this.transform = transform;
        grid.TriggerGridObjectChanged(x, z);
    }

    public void ClearTransform() {
        this.transform = null;
        grid.TriggerGridObjectChanged(x, z);
    }

    public bool CanBuild() {
        if (UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject()) return false; // Check if over UI element
        return transform == null;
    }

    public override string ToString() {
        return x + ", " + z + " \n" + transform;
    }
}