Unity uGUI 长按事件

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在Unity 4.6新增的uGUI中，可以方便地对控件，通过添加EventTrigger脚本来进行添加事件。但是里面并没有包括长按事件，需要自己来实现长按事件。

长按事件

以下是一种实现方式，来自《Handling long press events in uGUI (Unity 4.6)》

using UnityEngine;using UnityEngine.Events;using UnityEngine.EventSystems;public class LongPressEventTrigger : UIBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler{    [Tooltip("How long must pointer be down on this object to trigger a long press")]    public float durationThreshold = 1.0f;    public UnityEvent onLongPress = new UnityEvent();    private bool isPointerDown = false;    private bool longPressTriggered = false;    private float timePressStarted;    private void Update()    {        if (isPointerDown && !longPressTriggered)        {            if (Time.time - timePressStarted > durationThreshold)            {                longPressTriggered = true;                onLongPress.Invoke();            }        }    }    public void OnPointerDown(PointerEventData eventData)    {        timePressStarted = Time.time;        isPointerDown = true;        longPressTriggered = false;    }    public void OnPointerUp(PointerEventData eventData)    {        isPointerDown = false;    }    public void OnPointerExit(PointerEventData eventData)    {        isPointerDown = false;    }}

长按或点击事件

当存在长按事件，又想存在点击事件时，那么就需要判断是否已经执行了长按事件，已经执行了就不能再执行点击事件了，代码如下：

using UnityEngine;using UnityEngine.Events;using UnityEngine.EventSystems;public class LongPressOrClickEventTrigger : UIBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler, IPointerClickHandler{    [Tooltip("How long must pointer be down on this object to trigger a long press")]    public float durationThreshold = 1.0f;    public UnityEvent onLongPress = new UnityEvent();    public UnityEvent onClick = new UnityEvent();    private bool isPointerDown = false;    private bool longPressTriggered = false;    private float timePressStarted;    private void Update()    {        if (isPointerDown && !longPressTriggered)        {            if (Time.time - timePressStarted > durationThreshold)            {                longPressTriggered = true;                onLongPress.Invoke();            }        }    }    public void OnPointerDown(PointerEventData eventData)    {        timePressStarted = Time.time;        isPointerDown = true;        longPressTriggered = false;    }    public void OnPointerUp(PointerEventData eventData)    {        isPointerDown = false;    }    public void OnPointerExit(PointerEventData eventData)    {        isPointerDown = false;    }    public void OnPointerClick(PointerEventData eventData)    {        if (!longPressTriggered)        {            onClick.Invoke();        }    }}

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