using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
 
public class Items : MonoBehaviour
{
 public List<GameObject> items = new List<GameObject>();
 
 //縮放時間
 public float time = 1.3f;
 
 //原先大小
 public Vector2 oldSize;
 
 //放大縮小速度
 public float speed;
 
 private void Start()
 {
 for (int i = 0; i < items.Count; i++)
 {
 EventTriggerListener.GetComponent(items[i]).onEnter = OnMouseEnter;
 EventTriggerListener.GetComponent(items[i]).onExit = OnMouseExit;
 }
 }
 
 
 void OnMouseEnter(GameObject go)
 {
 EventTriggerListener.GetComponent(go).UpdateSize(oldSize * time, speed);
 }
 
 void OnMouseExit(GameObject go)
 {
 EventTriggerListener.GetComponent(go).UpdateSize(oldSize, speed);
 }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
 
[RequireComponent(typeof(LayoutElement))]
public class EventTriggerListener : EventTrigger
{
 public delegate void VoidDelegate(GameObject obj);
 //點擊
 public VoidDelegate onClick;
 //鼠標按下
 public VoidDelegate onDown;
 //鼠標抬起
 public VoidDelegate onUp;
 //鼠標移入
 public VoidDelegate onEnter;
 //鼠標移出
 public VoidDelegate onExit;
 
 private Vector2 currentSize;
 private Vector2 targetSize;
 private float speed = 4.0f;
 
 public static EventTriggerListener GetComponent(GameObject obj)
 {
 EventTriggerListener listener = obj.GetComponent<EventTriggerListener>();
 if (listener == null)
 {
 listener = obj.AddComponent<EventTriggerListener>();
 }
 
 return listener;
 }
 
 
 public override void OnPointerClick(PointerEventData eventData)
 {
 if (onClick != null)
 {
 onClick(gameObject);
 }
 }
 public override void OnPointerDown(PointerEventData eventData)
 {
 if (onDown != null) onDown(gameObject);
 }
 public override void OnPointerUp(PointerEventData eventData)
 {
 if (onUp != null) onUp(gameObject);
 }
 public override void OnPointerEnter(PointerEventData eventData)
 {
 if (onEnter != null) onEnter(gameObject);
 }
 public override void OnPointerExit(PointerEventData eventData)
 {
 if (onExit != null) onExit(gameObject);
 }
 
 
 
 private void Start()
 {
 targetSize = currentSize = new Vector2(this.GetComponent<LayoutElement>().preferredWidth, this.GetComponent<LayoutElement>().preferredHeight);
 }
 
 private void Update()
 {
 if (currentSize != targetSize)
 {
 currentSize = Vector2.Lerp(currentSize, targetSize, Time.deltaTime * speed);
 if (Vector2.Distance(currentSize, targetSize) <= 0.01)
 {
 currentSize = targetSize;
 }
 
 this.GetComponent<LayoutElement>().preferredWidth = currentSize.x;
 this.GetComponent<LayoutElement>().preferredHeight = currentSize.y;
 }
 }
 
 public void UpdateSize(Vector2 size,float speed)
 {
 this.targetSize = size;
 this.speed = speed;
 }
}