Unity -- 物品背包的物品拖动脚本示例

约定不等于承诺〃 2022-05-09 07:16 346阅读 0赞

using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    using UnityEngine.EventSystems;
    
    public class DragGridHelper : MonoBehaviour,IBeginDragHandler, IDragHandler, IEndDragHandler
    {
    
    
        public void OnBeginDrag(PointerEventData eventData)
        {
            //获取格子中的物品
            if(transform.childCount > 0)
            {
                Transform child = transform.GetChild(0);
                eventData.selectedObject = child.gameObject;
                Canvas vanvas = child.GetComponent<Canvas>();//每个可以拖动的物体需要有canvas 组件 以调节显示层级
                vanvas.sortingOrder = vanvas.sortingOrder + 1;//避免遮挡
            }
            
        }
    
    
        public void OnDrag(PointerEventData eventData)
        {
            if (eventData.selectedObject != null)
            
            {
                eventData.selectedObject.transform.position = Input.mousePosition;//物体随鼠标移动
              
            }
        }
    
    
        public void OnEndDrag(PointerEventData eventData)
        {
            if (eventData.selectedObject != null)
            {
                //如果拖拽到了外面 或者停留的地方不是grid
                if (eventData.pointerEnter == null || eventData.pointerEnter.tag != "grid")
                {
                    //还原到初始位置
                    eventData.selectedObject.transform.SetParent(eventData.pointerDrag.transform);
                    //清零本地坐标值
                    eventData.selectedObject.transform.localPosition = Vector2.zero;
                    return;
                }
    
                 //如果当前停留的地方是格子
                if(eventData.pointerEnter.tag == "grid")
                {
                    //判断当前格子是否已经存在物体
                    if(eventData.pointerEnter.transform.childCount == 0)
                    {
                        //设置拖动物体的父组件为当前格子
                        eventData.selectedObject.transform.SetParent(eventData.pointerEnter.transform);
          
                    }
                    else //当前格子已经存放物体了
                    {
                       //获取当前格子的物体
                        Transform item = eventData.pointerEnter.transform.GetChild(0);
                        //把当前格子的物体放到拖动物体的格子中
                        item.SetParent(eventData.pointerDrag.transform);
                        //清零本地坐标值
                        item.localPosition = Vector2.zero;
                        //设置拖动物体的父组件为当前格子
                        eventData.selectedObject.transform.SetParent(eventData.pointerEnter.transform);
    
                    }
    
                    //清零理拖动物体的本地坐标值
                    eventData.selectedObject.transform.localPosition = Vector2.zero;
                    //还原vanvas.sortingOrder值
                    Canvas vanvas = eventData.selectedObject.GetComponent<Canvas>();
                    vanvas.sortingOrder = vanvas.sortingOrder - 1;
                }
            }
        }
    
    
        // Use this for initialization
        void Start () {
    		
    	}
    	
    	// Update is called once per frame
    	void Update () {
    		
    	}
    }

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[70]: /images/20220509/dcd0c50c32a14db3bc108b46db608ebe.png