【Unity3D / UI】 快速处理鼠标事件的方法

    Unity的UGUI，处理鼠标事件，需要自行实现IPointerClickHandler，IPointerDownHandler等接口，很不方便。

    我们可以把常用接口封装起来，让需要实现鼠标事件的类，继承已经封装好的类即可。

using System;using UnityEngine;using UnityEngine.EventSystems;public class ClickOnListener : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerUpHandler {#region Actionpublic Action ActClick = delegate {};public Action ActPress = delegate { };public Action ActRelease = delegate { };#endregion#region Click Event/// <summary>/// 当鼠标点击时/// </summary>/// <param name="eventData"></param>public void OnPointerClick(PointerEventData eventData) {ActClick();}/// <summary>/// 当鼠标按下时/// </summary>/// <param name="eventData"></param>public void OnPointerDown(PointerEventData eventData) {ActPress();}/// <summary>/// 当鼠标抬起时/// </summary>/// <param name="eventData"></param>public void OnPointerUp(PointerEventData eventData) {ActRelease();}/// <summary>/// 清除/// </summary>public void Clear() {ActClick = null;ActPress = null;ActRelease = null;}#endregion}

    如此一来，只需要让UI类继承 ClickOnListener 类，然后注册 ActClick 等已经封装好的事件即可，比每次都重复实现接口的效率要高不少。

    本例封装了三个接口，有需要可以把UI事件接口全部封装起来（见下文）。不过需要注意一个问题，由于这些接口都是空实现，但是只要写了这个方法，哪怕没有实现，Unity的UI消息机制，也会每次将消息发送到这个方法上，会有一定性能开销。

还可以增加一个静态接口，用于发送鼠标事件：

#region Static/// <summary>/// 向指定对象发送点击事件/// </summary>/// <param name="target">目标</param>public static void SendOnClick(GameObject target) {PointerEventData eventData = new PointerEventData(null);target.SendMessage("OnPointerClick", eventData);} #endregion

最后附上一个比较完整的UI事件监听器类，有需要同时处理较多UI事件的情况可以直接使用。

using UnityEngine;using UnityEngine.EventSystems;public class UIEventListener : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerEnterHandler,IPointerExitHandler,IPointerUpHandler, ISelectHandler, IUpdateSelectedHandler, IDeselectHandler, IDragHandler,IEndDragHandler, IDropHandler, IScrollHandler, IMoveHandler{public delegate void UIPointerEventDelegate(GameObject go, PointerEventData data);public delegate void UIBaseEventDelegate(GameObject go, BaseEventData data);public delegate void UIAxisEventDelegate(GameObject go, AxisEventData data);public UIPointerEventDelegate onClick = delegate { };public UIPointerEventDelegate onDown = delegate { };public UIPointerEventDelegate onEnter = delegate { };public UIPointerEventDelegate onExit = delegate { };public UIPointerEventDelegate onUp = delegate { };public UIBaseEventDelegate onSelect = delegate { };public UIBaseEventDelegate onUpdateSelect = delegate { };public UIBaseEventDelegate onDeSelect = delegate { };public UIPointerEventDelegate onDrag = delegate { };public UIPointerEventDelegate onEndDrag = delegate { };public UIPointerEventDelegate onDrop = delegate { };public UIPointerEventDelegate onScroll = delegate { };public UIAxisEventDelegate onMove = delegate { };/// <summary>/// 用于对任意UI对象快速获取UI事件监听器/// </summary>/// <param name="go">对象</param>/// <returns>结果</returns>public static UIEventListener Get(GameObject go){return go.GetOrAddComponent<UIEventListener>();}public void OnPointerClick(PointerEventData eventData){onClick(gameObject, eventData);}public void OnPointerDown(PointerEventData eventData){onDown(gameObject, eventData);}public void OnPointerEnter(PointerEventData eventData){onEnter(gameObject, eventData);}public void OnPointerExit(PointerEventData eventData){onExit(gameObject, eventData);}public void OnPointerUp(PointerEventData eventData){onUp(gameObject, eventData);}public void OnSelect(BaseEventData eventData){onSelect(gameObject, eventData);}public void OnUpdateSelected(BaseEventData eventData){onUpdateSelect(gameObject, eventData);}public void OnDeselect(BaseEventData eventData){onDeSelect(gameObject, eventData);}public void OnDrag(PointerEventData eventData){onDrag(gameObject, eventData);}public void OnEndDrag(PointerEventData eventData){onEndDrag(gameObject, eventData);}public void OnDrop(PointerEventData eventData){onDrop(gameObject, eventData);}public void OnScroll(PointerEventData eventData){onScroll(gameObject, eventData);}public void OnMove(AxisEventData eventData){onMove(gameObject, eventData);}}