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Unity防止点击按钮

event-propagation unity3d events c#

johnny 5 · 技术社区 · 8 年前

我正在为长时间按下按钮创建脚本。长按钮按下有效,唯一的问题是,如果长按钮按下触发,我想阻止点击按钮。

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System.Collections;

public class LongPressButton : 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;
    }
}

按钮脚本是黑框的,看起来像是构建到unity引擎中。

我知道有一些方法可以防止事件传播到3d世界,但有没有一种方法可以防止在按钮脚本上传播?

1 回复 | 直到 8 年前

johnny 5 8 年前

我已经知道了,由于事件系统的统一性限制,您需要两个脚本来完成。首先是长按钮按下脚本:

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System.Collections;
using UnityEngine.UI;

public class LongPressButton : 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;

    public bool WasLongPressTriggered
    {
        get;
        protected set;
    }

    private void Update()
    {
        if (isPointerDown && false == longPressTriggered)
        {
            if (Time.time - timePressStarted > durationThreshold)
            {
                longPressTriggered = true;
                WasLongPressTriggered = true;
                onLongPress.Invoke();
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        timePressStarted = Time.time;
        isPointerDown = true;
        longPressTriggered = false;
        WasLongPressTriggered = false;
    }

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


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

然后,您将需要一个新的按钮脚本来覆盖旧的基本按钮:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class Button2 : Button
{
    public bool PreventPropagationOnLongPress;

    public override void OnPointerClick(PointerEventData eventData)
    {
        var longPress = GetComponent<LongPressButton>();
        if (longPress == null)
        {
            base.OnPointerClick(eventData);
        }
        if(false == longPress.WasLongPressTriggered)
        {
            base.OnPointerClick(eventData);
        }
    }
}

这在编辑器中起作用。它尚未在移动设备上进行全面测试,可能在unity edidor中调用点击,但在移动设备中,它可能会在鼠标向上时触发。目前,这将防止事件传播,