19. 卡牌拖拽

给 Card 添加 CardDragHandler

代码如下

using UnityEngine;
using UnityEngine.EventSystems;

public class CardDragHandler : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    private Card currentCard;
    private bool canMove;
    private bool canExecute;

    private void Awake() 
    {   
        currentCard = GetComponent<Card>();
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        switch (currentCard.cardData.cardType)
        {
            case CardType.Attack:
                break;
            case CardType.Defense:
            case CardType.Abilities:
                canMove = true;
                break;
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (canMove)
        {
            currentCard.isAnimating = true;
            Vector3 screenPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 10.0f);
            Vector3 worldPos = Camera.main.ScreenToWorldPoint(screenPos);

            currentCard.transform.position = worldPos;
            canExecute = worldPos.y > 1f;
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        if (canExecute)
        {

        }
        else
        {
            currentCard.ResetCardTransform();
            currentCard.isAnimating = false;
        }
    }
}

目前实现的效果是，当正在拖拽的卡牌是Defense或者Abilities时，就允许它进行拖拽

拖拽的时候，会将鼠标当前的位置转换为世界坐标的位置，然后让卡牌来到这个位置

当停止拖拽的时候，会让卡牌来到最初的位置

如果卡牌拖动到 y 轴为 1 及以上位置的时候，就执行这张牌

项目相关代码

代码仓库：https://gitee.com/nbda1121440/DreamOfTheKingdom.git

标签：20240305_1449