ichni_Official/Assets/Scripts/UI/SongSelection/PlaySongUI.cs

using System;
using System.Collections;
using System.Collections.Generic;
using DG.Tweening;
using UniRx;
using UnityEngine;
using UnityEngine.UI;

namespace Ichni.Menu
{
    public class PlaySongUI : MonoBehaviour
    {
        public Button enterGameButton;
        public List<RectTransform> arrows;

        private void Start()
        {
            enterGameButton.onClick.AddListener(EnterGame);
        }

        private void EnterGame()
        {
            if (MenuManager.instance.songSelectionUIPage.songListController.selectedTab.isLocked)
            {
                return;
            }
            
            if (MenuManager.instance.isEnteringGame)
            {
                return;
            }
            
            MenuManager.instance.isEnteringGame = true;
            
            InformationTransistor.instance.SetInformation(
                ChapterSelectionManager.instance.currentChapter, 
                MenuManager.instance.songSelectionUIPage.selectedSong, 
                MenuManager.instance.songSelectionUIPage.selectedDifficulty);
            MenuAudioManager.instance.audioContainer.PlaySoundFX("EnterToGame");
            MenuAudioManager.instance.audioContainer.StopEvent("PlayPreview");
            
            DOTween.KillAll();

            Sequence arrowSeq = DOTween.Sequence();
            
            foreach (var arrow in arrows)
            {
                arrowSeq.Join(arrow.DOAnchorPosX(-584.5f, 0.2f));
            }
            
            arrowSeq.OnComplete(() =>
            {
                MenuManager.instance.transitionUIPage.FadeIn();
                Observable.Timer(TimeSpan.FromSeconds(0.6f)).Subscribe(_ =>
                {
                    MenuManager.instance.EnterGame();
                });
            });

            arrowSeq.Play();
        }
    }
}