Unity 按钮实现长按

添加双击响应【2018/12/13】

unity中实现按钮的长按功能，长按刷新和长按执行一次，同时可存在点击事件，

先编写如下脚本：

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
public class ButtonExtension : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler {
    public float pressDurationTime = 1;
    public bool responseOnceByPress = false;
    public float doubleClickIntervalTime = 0.5f;

    public UnityEvent onDoubleClick;
    public UnityEvent onPress;
    public UnityEvent onClick;

    private bool isDown = false;
    private bool isPress = false;
    private float downTime = 0;

    private float clickIntervalTime = 0;
    private int clickTimes = 0;

    void Update() {
        if (isDown) {
            if (responseOnceByPress && isPress) {
                return;
            }
            downTime += Time.deltaTime;
            if (downTime > pressDurationTime) {
                isPress = true;
                onPress.Invoke();
            }
        }
        if (clickTimes >= 1) {
            clickIntervalTime += Time.deltaTime;
            if (clickIntervalTime >= doubleClickIntervalTime) {
                if (clickTimes >= 2) {
                    onDoubleClick.Invoke();
                }
                else {
                    onClick.Invoke();
                }
                clickTimes = 0;
                clickIntervalTime = 0;
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData) {
        isDown = true;
        downTime = 0;
    }

    public void OnPointerUp(PointerEventData eventData) {
        isDown = false;
    }

    public void OnPointerExit(PointerEventData eventData) {
        isDown = false;
        isPress = false;
    }

    public void OnPointerClick(PointerEventData eventData) {
        if (!isPress ) {
            //onClick.Invoke();
            clickTimes += 1;
        }
        else
            isPress = false;
    }
}

将脚本添加到按钮上

然后就可以在Test脚本中使用了：

using UnityEngine;
public class Test : MonoBehaviour {
    ButtonExtension btn;

    void Start() {
        btn = GetComponent();
        btn.onClick.AddListener(Click);
        btn.onPress.AddListener(Press);
        btn.onDoubleClick.AddListener(DoubleClick);
    }

    void Click() {
        Debug.Log("click");
    }

    void Press() {
        Debug.Log("press");
    }

    void DoubleClick() {
        Debug.Log("double click");
    }
}