Unity ScrollRect 키입력으로 스크롤 구현

스테이지 선택 구현코드

UNITY 가로 Scroll UI에 키 입력으로 스크롤 구현.

Unity의 스크롤은 포인터(마우스)로 이동하는데, 키보드로 스크롤 할수 있도록 구현한 코드

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

public class StageSelectManagerEx : MonoBehaviour {
    private int clearStage = 8;
    public Transform StageSelectButtonParent;
    public GameObject StageSelectButtonPrefab;
    public ScrollRect menuScrollRect;
    public RectTransform rectTrans;
    // Use this for initialization
    void Start () {
        clearStage = PlayerPrefs.GetInt("clearSingleStage", 1);
        Button goLast = null;
        for (int i = 1; i <= clearStage; i++)
        {
            GameObject go = (GameObject)Instantiate(StageSelectButtonPrefab);
            go.GetComponentInChildren<Text>().text = i.ToString();
            go.name = "Stage" + i.ToString();
            go.GetComponentInChildren<Button>().onClick.AddListener(delegate { ButtonStageClick(go.name); });
            go.transform.parent = StageSelectButtonParent;
            if (i == clearStage)
                goLast = go.GetComponentInChildren<Button>();
        }

        menuScrollRect.horizontalNormalizedPosition = 1.0f;

        if (goLast != null)
            goLast.Select();
    }

    void ScrollRight()
    {
        if (menuScrollRect.horizontalNormalizedPosition < 1.0f)
            menuScrollRect.horizontalNormalizedPosition += 0.01f;
        else
            menuScrollRect.horizontalNormalizedPosition = 1f;
    }

    void ScrollLeft()
    {
        if (menuScrollRect.horizontalNormalizedPosition > 0.0f)
            menuScrollRect.horizontalNormalizedPosition -= 0.01f;
        else
            menuScrollRect.horizontalNormalizedPosition = 0f;
    }

    void ScrollCalc()
    {
        //스크롤 값을 계산하여 스크롤 함.
        GameObject currentSelectButton = EventSystem.current.currentSelectedGameObject;
        if (currentSelectButton == null)
            return;

        float width_center = menuScrollRect.gameObject.transform.position.x;
        float width_harf = (menuScrollRect.GetComponent<RectTransform>().rect.width / 2);
        float width_min = width_center - width_harf;
        float width_max = width_center + width_harf;
        float buttons_spacing = currentSelectButton.transform.parent.parent.gameObject.GetComponent<GridLayoutGroup>().spacing.x;
        float button_width = currentSelectButton.GetComponent<RectTransform>().rect.width;

        float button_width_min = currentSelectButton.transform.position.x - (button_width / 2);
        float button_width_max = button_width_min + button_width;


        if (button_width_min < width_min)
            ScrollLeft();
        else if (button_width_max > width_max)
            ScrollRight();

    }
	
	// Update is called once per frame
    void Update () {
        ScrollCalc();
    }

    void ButtonStageClick(string stageName)
    {
        Application.LoadLevel(stageName);
    }
}