//--------------------------------------------------------
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// [Author]: 玩个游戏
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// [ Date ]: Monday, July 31, 2017
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//--------------------------------------------------------
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using UnityEngine;
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using System.Collections;
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using UnityEngine.EventSystems;
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using System;
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using UnityEngine.Events;
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/// <summary>
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/// 拖拽组件，实现拖拽功能并限制拖拽范围
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/// </summary>
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public class DragItem:MonoBehaviour,ICanvasRaycastFilter,IBeginDragHandler,IDragHandler,IEndDragHandler
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{
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[SerializeField] public Canvas parentCanvas;
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[SerializeField] public Canvas canvas;
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// 拖拽区域限制
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[SerializeField]
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RectTransform m_Area;
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public RectTransform area { get { return m_Area; } }
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// 是否允许射线检测
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[SerializeField]
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bool m_RaycastTarget = true;
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public bool raycastTarget {
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get { return m_RaycastTarget; }
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private set { m_RaycastTarget = value; }
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}
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[NonSerialized] public int pos;
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private DragContainer lastTransform;
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// 当前对象的RectTransform组件
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RectTransform rectTransform { get { return this.transform as RectTransform; } }
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/// <summary>
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/// 开始拖拽时调用
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/// </summary>
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public void OnBeginDrag(PointerEventData eventData)
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{
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raycastTarget = false;
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this.transform.position = UIUtility.ClampWorldPosition(area, eventData);
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rectTransform.localScale = Vector3.one * 1.2f;
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canvas.sortingLayerID = parentCanvas.sortingLayerID;
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canvas.sortingOrder = parentCanvas.sortingOrder + pos + 10;
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}
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/// <summary>
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/// 拖拽过程中调用
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/// </summary>
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public void OnDrag(PointerEventData eventData) {
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this.transform.position = UIUtility.ClampWorldPosition(area,eventData);
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// 检测是否进入目标区域
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if (eventData.pointerEnter != null)
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{
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if (lastTransform != null && lastTransform != eventData.pointerEnter.GetComponent<DragContainer>())
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{
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lastTransform.mainTransform.localScale = Vector3.one;
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lastTransform = null;
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}
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var target = eventData.pointerEnter.GetComponent<DragContainer>();
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// 输出组件路径
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if (target != null)
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{
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lastTransform = target;
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// 进入目标区域，放大 1.2 倍
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lastTransform.mainTransform.localScale = Vector3.one * 1.2f;
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}
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}
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rectTransform.localScale = Vector3.one * 1.2f;
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}
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/// <summary>
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/// 结束拖拽时调用
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/// </summary>
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public Action<int, int> onEndDragEvent;
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public void OnEndDrag(PointerEventData eventData)
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{
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raycastTarget = true;
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rectTransform.localScale = Vector3.one;
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if (lastTransform != null)
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{
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lastTransform.mainTransform.localScale = Vector3.one;
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lastTransform = null;
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}
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if (eventData.pointerEnter == null)
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{
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onEndDragEvent?.Invoke(pos, -1);
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return;
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}
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var container = eventData.pointerEnter.GetComponent<DragContainer>();
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if (container == null)
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{
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onEndDragEvent?.Invoke(pos, -1);
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return;
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}
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onEndDragEvent?.Invoke(pos, container.pos);
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canvas.sortingLayerID = parentCanvas.sortingLayerID;
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canvas.sortingOrder = parentCanvas.sortingOrder + pos + 1;
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}
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/// <summary>
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/// 判断射线检测是否有效
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/// </summary>
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public bool IsRaycastLocationValid(Vector2 sp,Camera eventCamera) {
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return raycastTarget;
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}
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}
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