Panel resize (child control)

using System;
using Toolz;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Rendering.PostProcessing;
using UnityEngine.UI;

namespace UI_controls {
    [RequireComponent(typeof(Image))]
    public class ControlSizable : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IDragHandler, IBeginDragHandler, IEndDragHandler {
        [SerializeField]
        private PanelMoveSize control;
        [SerializeField]
        private PanelMoveSize.SizableType type;
        private Vector2 startPos;
        private Vector2 startSize;
        private Image   image;

        private void Start() {
            if (type == PanelMoveSize.SizableType.HorizontalRight && control.minWidth  <= 0) control.minWidth  += ((RectTransform) transform).sizeDelta.x;
            if (type == PanelMoveSize.SizableType.HorizontalLeft  && control.minWidth  <= 0) control.minWidth  += ((RectTransform) transform).sizeDelta.x;
            if (type == PanelMoveSize.SizableType.VerticalTop     && control.minHeight <= 0) control.minHeight += ((RectTransform) transform).sizeDelta.y;
            if (type == PanelMoveSize.SizableType.VerticalBottom  && control.minHeight <= 0) control.minHeight += ((RectTransform) transform).sizeDelta.y;
        }

        public void OnPointerEnter(PointerEventData eventData) {
            //
        }

        public void OnPointerExit(PointerEventData eventData) {
            //
        }

        public void OnDrag(PointerEventData eventData) {
            var p = eventData.position;
            p.x /= control.scale.x;
            p.y /= control.scale.y;
            control.Resize(startSize + p - startPos, type);
        }

        public void OnBeginDrag(PointerEventData eventData) {
            startPos   =  eventData.position;
            startPos.x /= control.scale.x;
            startPos.y /= control.scale.y;
            startSize  =  control.rTr.sizeDelta;
        }

        public void OnEndDrag(PointerEventData eventData) {
        }
    }
}