[游戏开发]Unity自定义Button

哈喽，艾瑞巴蒂，你们好嘛，2022年到来了，小黑在这里祝愿大家在新的一年如猛虎一头，在工作中用虎的霸气吓退困难，在生活中用虎的“傻不拉几”温暖身边人。新年快乐~

好了，新的一年，新的开始，新的水博客~今天给大家带来，Unity中的自定义按钮：CustomButton。因为好多时候吧，UGUI中的Button并不能满足我们的需求，那怎么办？自己写一个！绝对不向困难妥协，但可以向困难拖鞋，熏死困难~！

该代码中包含以下几个事件：其中按着事件，与其他事件共存。双击事件会先触发单击

• onClick? ? ? ? ? ? ? ? ? ? ? ? ?单击
• onDoubleClick? ? ? ? ? ? ?双击
• onLongPress? ? ? ? ? ? ? ?长按
• onKeepPress? ? ? ? ? ? ? ?按着

?

?大家可以根据自己的需求来使用，也可以进行拓展，可能小黑的代码水平不高，但是希望能帮助到大家，如果你们拓展了告诉小黑一下，小黑会加到博客中来，并且标明是谁提供。

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

/*
 * Introduction:Custom UGUI`s button
 * Creator:Xiaohei Wang
 */
[RequireComponent(typeof(Image))]
[RequireComponent(typeof(CanvasRenderer))]
public class CustomButton : Selectable, IPointerClickHandler, ISubmitHandler
{
    protected CustomButton() { }

    [Serializable]
    public class ButtonClickedEvent : UnityEvent { }

    [FormerlySerializedAs("onClick")]
    [SerializeField]
    private ButtonClickedEvent m_OnClick = new ButtonClickedEvent(); 

    [FormerlySerializedAs("onLongPress")]
    [SerializeField]
    private ButtonClickedEvent m_onLongPress = new ButtonClickedEvent();

    [FormerlySerializedAs("onDoubleClick")]
    [SerializeField]
    private ButtonClickedEvent m_onDoubleClick = new ButtonClickedEvent();

    [FormerlySerializedAs("onKeepPress")]
    [SerializeField]
    private ButtonClickedEvent m_onKeepPress = new ButtonClickedEvent();

    public ButtonClickedEvent onClick
    {
        get { return m_OnClick; }
    }
    public ButtonClickedEvent onDoubleClick
    {
        get { return m_onDoubleClick; }
    }
    public ButtonClickedEvent onLongPress
    {
        get { return m_onLongPress; }
    }
    public ButtonClickedEvent onKeepPress
    {
        get { return m_onKeepPress; }
    }

    private bool m_isPress = false;
    private bool m_longPress = false;
    private bool m_isKeepPress = false;
    private DateTime m_currentStartTime;


    private void Press()
    {
        if (!IsActive() || !IsInteractable())
            return;

        UISystemProfilerApi.AddMarker("Button.onClick", this);
        m_OnClick.Invoke();
    }

    private void Update()
    {
        CheckForLongPress();

        if (m_isKeepPress) onKeepPress?.Invoke();
    }

    private void CheckForLongPress()
    {
        if (m_isPress && !m_longPress)
        {
            if ((DateTime.Now - m_currentStartTime).TotalMilliseconds >= 600)
            {
                m_isPress = false;
                m_longPress = true;
                m_onLongPress?.Invoke();
            }
        }
    }

    public override void OnPointerDown(PointerEventData eventData)
    {
        m_isPress = true;
        m_longPress = false;
        m_isKeepPress = true;
        m_currentStartTime = DateTime.Now;

        base.OnPointerDown(eventData);
    }

    public override void OnPointerUp(PointerEventData eventData)
    {
        m_isPress = false;
        m_isKeepPress = false;

        base.OnPointerUp(eventData);
    }

    public override void OnPointerExit(PointerEventData eventData)
    {
        m_isPress = false;
        m_isKeepPress = false;

        base.OnPointerExit(eventData);
    }

    public virtual void OnPointerClick(PointerEventData eventData)
    {
        if (!m_longPress)
        {
            if (eventData.clickCount == 2)
                m_onDoubleClick?.Invoke();
            else if (eventData.clickCount == 1)
                onClick?.Invoke();
        }
    }

    public virtual void OnSubmit(BaseEventData eventData)
    {
        Press();

        if (!IsActive() || !IsInteractable())
            return;

        DoStateTransition(SelectionState.Pressed, false);
        StartCoroutine(OnFinishSubmit());
    }

    private IEnumerator OnFinishSubmit()
    {
        var fadeTime = colors.fadeDuration;
        var elapsedTime = 0f;

        while (elapsedTime < fadeTime)
        {
            elapsedTime += Time.unscaledDeltaTime;
            yield return null;
        }

        DoStateTransition(currentSelectionState, false);
    }
}

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