Blazor/BlazorApp1/Components/InventoryItem.razor.cs

using Microsoft.AspNetCore.Components;

namespace BlazorApp1.Components
{
    public partial class InventoryItem : ItemDisplay
    {
        [Parameter]
        public int Index { get; set; }

        [Parameter]
        public Item Item { get; set; }

        [Parameter]
        public bool NoDrop { get; set; }

        public int nbElem { get; set; }

        [CascadingParameter]
        public Inventory Parent { get; set; }

        public void changeState()
        {
            StateHasChanged();
        }

        public Item getItem()
        {
            return Item;
        }

        public int getNbElement()
        {
            return nbElem;
        }

        public String getTypeID()
        {
            return "InventoryItem";
        }

        internal void OnDragEnter()
        {
            if (NoDrop)
            {
                return;
            }
        }

        internal void OnDragLeave()
        {
            if (NoDrop)
            {
                return;
            }

        }

        internal void OnDrop()
        {
            if (NoDrop)
            {
                return;
            }

            if (this.Item is not null)
            {
                if (this.Item.Equals(Parent.CurrentDragItem) && this.nbElem < 64)
                    this.nbElem++;
            }
            else
            {
                Item tmp = this.Item;
                int tmpNb = this.nbElem;

                this.Item = Parent.CurrentDragItem;
                this.nbElem = Parent.CurrentEllement.getNbElement();

                if (Parent.CurrentEllement.getTypeID() == "InventoryItem")
                {
                    InventoryItem invItem = (InventoryItem)Parent.CurrentEllement;
                    
                    invItem.Item = tmp;
                    invItem.nbElem = tmpNb;

                    Parent.CurrentEllement = invItem;
                }
                else if (Parent.CurrentEllement.getTypeID() == "ListItem")
                {

                }
            }
            Parent.CurrentEllement.changeState();
            StateHasChanged();
        }

        private void OnDragStart()
        {
            Parent.CurrentDragItem = this.Item;
            Parent.CurrentEllement = this;
        }
    }
}