using System;
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using UnityEngine;
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using UnityEngine.EventSystems;
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using System.Collections.Generic;
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namespace vnxbqy.UI
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{
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[DisallowMultipleComponent]
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public class DragSelectComponentEx : MonoBehaviour
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{
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[SerializeField] float m_Sensitive = 10f;
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[SerializeField] GameObject m_TargetObject;
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public event Action<int> onDragComplete;
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private bool m_StartDrag = false;
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Vector3 start_position = Vector3.zero;
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bool isArea = false;
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private void LateUpdate()
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{
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if (Input.touchCount > 1)
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{
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m_StartDrag = false;
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return;
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}
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if (Input.GetMouseButtonDown(0))
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{
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m_StartDrag = true;
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start_position = Input.mousePosition;
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isArea = RectTransformUtility.RectangleContainsScreenPoint(this.transform as RectTransform, start_position, CameraManager.uiCamera);
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if (!IsOverTarget())
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{
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m_StartDrag = false;
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return;
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}
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}
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else if (Input.GetMouseButtonUp(0) && m_StartDrag)
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{
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var delta = Input.mousePosition - start_position;
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m_StartDrag = false;
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// 判断滑动方向
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if (Mathf.Abs(delta.x) >= m_Sensitive || Mathf.Abs(delta.y) >= m_Sensitive)
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{
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int direction = 0;
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// 水平方向优先
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if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
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{
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direction = delta.x > 0 ? 1 : -1; // 1 表示向右滑动，-1 表示向左滑动
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}
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// 垂直方向优先
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else
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{
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direction = delta.y > 0 ? 2 : -2; // 2 表示向上滑动，-2 表示向下滑动
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}
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// 新增目标对象检测条件
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if (onDragComplete != null && isArea)
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{
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onDragComplete(direction);
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}
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}
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}
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}
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// 新增目标检测方法
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private bool IsOverTarget()
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{
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if (m_TargetObject == null) return true;
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PointerEventData eventData = new PointerEventData(EventSystem.current)
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{
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position = Input.mousePosition
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};
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List<RaycastResult> results = new List<RaycastResult>();
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EventSystem.current.RaycastAll(eventData, results);
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if (results.Count > 0)
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{
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RaycastResult result = results[0];
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if (result.gameObject == m_TargetObject)
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{
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return true;
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}
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if (result.gameObject.transform.parent.gameObject == m_TargetObject)
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{
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return true;
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}
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}
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return false;
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}
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private void OnDisable()
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{
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m_StartDrag = false;
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}
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}
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}
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