using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

/// <summary>
/// 我的自定义Button，继承 Button
/// </summary>
public class LongPressButton : Button
{
    // 构造函数
    protected LongPressButton()
    {
        my_onLongPress = new ButtonClickedEvent();
        my_onLongPress_Up = new ButtonClickedEvent();
    }

    // 长按
    public ButtonClickedEvent my_onLongPress;
    // 长按抬起
    public ButtonClickedEvent my_onLongPress_Up;

    public ButtonClickedEvent OnLongPress
    {
        get { return my_onLongPress; }
        set { my_onLongPress = value; }
    }
    public ButtonClickedEvent OnLongPress_Up
    {
        get { return my_onLongPress_Up; }
        set { my_onLongPress_Up = value; }
    }
    // 长按需要的变量参数
    private bool my_isStartPress = false;
    private float my_curPointDownTime = 0f;
    private float my_longPressTime = 0f;
    private bool my_longPressTrigger = false;


    void Update()
    {
        CheckIsLongPress();
    }

    #region 长按

    /// <summary>
    /// 处理长按
    /// </summary>
    void CheckIsLongPress()
    {
        if (my_isStartPress && !my_longPressTrigger)
        {
            if (Time.time > my_curPointDownTime + my_longPressTime)
            {
                my_longPressTrigger = true;
                my_isStartPress = false;
                if (my_onLongPress != null)
                {
                    my_onLongPress.Invoke();
                }
            }
        }
    }

    public override void OnPointerDown(PointerEventData eventData)
    {
        // 按下刷新當前時間
        base.OnPointerDown(eventData);
        my_curPointDownTime = Time.time;
        my_isStartPress = true;
        my_longPressTrigger = false;
    }

    public override void OnPointerUp(PointerEventData eventData)
    {
        // 指針擡起，結束開始長按
        base.OnPointerUp(eventData);
        my_isStartPress = false;
        if (my_longPressTrigger)
        {
            if (my_onLongPress_Up != null)
            {
                my_onLongPress_Up.Invoke();
            }
            my_longPressTrigger = !my_longPressTrigger;
        }
    }

    public override void OnPointerExit(PointerEventData eventData)
    {
        // 指針移出，結束開始長按，計時長按標志
        base.OnPointerExit(eventData);
        my_isStartPress = false;

    }
    #endregion
}