Unity Animation sequencer

AnimationSequencer.cs

using UnityEngine;
using System.Collections;
using UnityEngine.Assertions;

[RequireComponent(typeof(Animator))]
public class AnimationSequencer : MonoBehaviour {

    // Use this for initialization
    private Animator myAnim;
    float nowLimit;
    float maxLength;
    float minLength = 0.4f;

    void Start () {
        myAnim = GetComponent<Animator>();
        Assert.IsNotNull(myAnim);
        //StartCoroutine(StopAnimation(0.5f));
        nowLimit = minLength;
        AnimatorStateInfo currentState = myAnim.GetCurrentAnimatorStateInfo(0);
        maxLength = currentState.length / 2.0f + minLength;
     }

    void Update()
    {
        AnimatorStateInfo currentState = myAnim.GetCurrentAnimatorStateInfo(0);
        if (currentState.length < Mathf.Infinity)
        {
            float absSpeed = Mathf.Abs(myAnim.GetFloat("speed"));
            float duration = currentState.normalizedTime * currentState.length * absSpeed / 2.0f;
            print(duration);
            if (myAnim.GetFloat("speed") > 0.0f)
            {
                if (duration > nowLimit)
                {
					if ( isPushing ) {
						nowLimit += 1.0f;
                        if (nowLimit > maxLength)
                        {
                            myAnim.SetFloat("speed", 0.0f);
                            nowLimit = maxLength;
                        }
                    } else {
                    	myAnim.SetFloat("speed", 0.0f);
					}
                }
            }
            else
            {
                if (duration < nowLimit)
                {
					if ( isPushing ) {
						nowLimit -= 1.0f;
                        if (nowLimit < minLength)
                        {
                            myAnim.SetFloat("speed", 0.0f);
                            nowLimit = minLength;
                        }
                        
                    } else {
    	                myAnim.SetFloat("speed", 0.0f);
					}
                }
            }
        }
    }
	
    public void OnNextButton()
    {
        if (myAnim.GetFloat("speed") > 0.0f) return;
        if (nowLimit >= maxLength)
        {
            nowLimit = maxLength;
        }
        else
        {
            myAnim.SetFloat("speed", 8.0f);
            nowLimit += 1.0f;
            nowLimit = Mathf.Min(nowLimit, maxLength);
        }
    }

    public void OnPrevButton()
    {
        if (myAnim.GetFloat("speed") < 0.0f) return;
        if (nowLimit <= 0.0f)
        {
            nowLimit = 0.0f;
        }
        else
        {
            myAnim.SetFloat("speed", -8.0f);
            nowLimit -= 1.0f;
            nowLimit = Mathf.Max(nowLimit, minLength);
        }
    }

	private bool isPushing = false;

	public void OnNextButtonPushStart()
	{
		isPushing = true;
		OnNextButton();
	}

	public void OnNextButtonPushEnd()
	{
		isPushing = false;
	}

	public void OnPrevButtonPushStart()
	{
		isPushing = true;
		OnPrevButton();
	}

	public void OnPrevButtonPushEnd()
	{
		isPushing = false;
	}

}