Pun-01/Assets/Scripts/Launcher.cs

using Photon.Pun;
using Photon.Realtime;
using UnityEngine;

namespace cc.ivanli.pun01
{
    public class Launcher : MonoBehaviourPunCallbacks
    {
        /// <summary>
        /// Client's version
        /// </summary>
        private readonly string gameVersion = "1";

        [Tooltip("The maximum number of players per room. When a room is full, it can't be joined by new players, and so new room will be created")]
        [SerializeField]
        private byte maxPlayersPerRoom = 4;

        [Tooltip("The Ui Panel to let the user enter name, connect and play")]
        [SerializeField]
        private GameObject controlPanel;

        [Tooltip("The UI Label to inform the user that the connection is in progress")]
        [SerializeField]
        private GameObject progressLabel;

        bool isConnecting;

        private void Awake()
        {
            PhotonNetwork.AutomaticallySyncScene = true;
        }

        private void Start()
        {
            progressLabel.SetActive(false);
            controlPanel.SetActive(true);
        }

        public void Connect()
        {
            progressLabel.SetActive(true);
            controlPanel.SetActive(false);
            if (PhotonNetwork.IsConnected)
            {
                PhotonNetwork.JoinRandomRoom();
            }
            else
            {
                isConnecting = PhotonNetwork.ConnectUsingSettings();
                PhotonNetwork.GameVersion = gameVersion;
            }
        }

        public override void OnConnectedToMaster()
        {
            Debug.Log("PUN Basics Launcher:OnConnectedToMaster() was called by PUN");
            base.OnConnectedToMaster();
            if (isConnecting)
            {
                // #Critical: The first we try to do is to join a potential existing room. If there is, good, else, we'll be called back with OnJoinRandomFailed()
                PhotonNetwork.JoinRandomRoom();
                isConnecting = false;
            }
        }

        public override void OnDisconnected(DisconnectCause cause)
        {
            progressLabel.SetActive(false);
            controlPanel.SetActive(true);
            isConnecting = false;

            Debug.LogWarningFormat("PUN basics Launcher:OnDisconnected() was called by PUN with reason {0}", cause);
            base.OnDisconnected(cause);
        }

        public override void OnJoinRandomFailed(short returnCode, string message)
        {
            Debug.Log("PUN BasicsLauncher:OnJoinRandomFailed() was called by PUN. No random room available, so we create one.\nCalling: PhotonNetwork.CreateRoom()");
            base.OnJoinRandomFailed(returnCode, message);

            PhotonNetwork.CreateRoom(null, new RoomOptions
            {
                MaxPlayers = maxPlayersPerRoom
            });
        }

        public override void OnJoinedRoom()
        {
            Debug.Log("PUN Basics Launcher:OnJoinedRoom() called by PUN. Now this client is in a room.");
            base.OnJoinedRoom();

            // #Critical: We only load if we are the first player, else we rely on `PhotonNetwork.AutomaticallySyncScene` to sync our instance scene.
            if (PhotonNetwork.CurrentRoom.PlayerCount == 1)
            {
                Debug.Log("We load the 'Room for 1' ");


                // #Critical
                // Load the Room Level.
                PhotonNetwork.LoadLevel("Room for 1");
            }
        }
    }
}