Unity-黑暗之魂复刻-按钮类

将按钮进行抽象
此类提供三个功能

1.IsPressing得知当前用户输入按钮的状态
2.OnPressed目前是否按下了此按钮
3.OnReleased目前是否释放了按钮

public class MyButton {
    public bool IsPressing = false;
    public bool OnPressed = false;
    public bool OnReleased = false;

    private bool curState = false;
    private bool lastState = false;

    public void Tick(bool input)
    {
        curState = input;
        IsPressing = curState;
        OnPressed = false;
        OnReleased = false;
        if(curState != lastState)
        {
            if(curState == true)
            {
                OnPressed = true;
            }
            else
            {
                OnReleased = true;
            }
        }
        lastState = curState;
    }
}

DoubleTrigger：
IsExtending：
在用户松开按键一段时间内输出信号