com.alicizax.unity.ui.extension/Runtime/RecyclerView/ViewHolder/ViewHolder.cs

using System;
using UnityEngine;

namespace AlicizaX.UI
{
    public abstract class ViewHolder : MonoBehaviour
    {
        private RectTransform rectTransform;

        internal event Action<ViewHolder> Destroyed;

        public RectTransform RectTransform
        {
            get
            {
                if (rectTransform == null)
                {
                    rectTransform = GetComponent<RectTransform>();
                }

                return rectTransform;
            }
        }

        public string Name { get; internal set; }

        public int Index { get; internal set; }

        public int DataIndex { get; internal set; } = -1;

        public RecyclerView RecyclerView { get; internal set; }

        public uint BindingVersion { get; private set; }

        public Vector2 SizeDelta => RectTransform.sizeDelta;

        internal uint AdvanceBindingVersion()
        {
            BindingVersion = BindingVersion == uint.MaxValue ? 1u : BindingVersion + 1u;
            return BindingVersion;
        }

        protected internal virtual void OnRecycled()
        {
            AdvanceBindingVersion();
            Name = string.Empty;
            Index = -1;
            DataIndex = -1;
            RecyclerView = null;
        }

        protected virtual void OnDestroy()
        {
            Destroyed?.Invoke(this);
            Destroyed = null;
        }
    }
}