CutsceneManager.cs

using UnityEngine;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using Janus;

public delegate void CutsceneStartedHandler (Vector3 focus);
public delegate void CutsceneFinishedHandler ();

public class CutsceneManager: MonoBehaviour
{
    public event CutsceneStartedHandler CutsceneStarted;
    public event CutsceneFinishedHandler CutsceneFinished;

    public static CutsceneManager Instance
    {
        get { return _instance; }
    }

    public bool IsInCutscene
    {
        get { return _isInCutscene; }
    }

    static CutsceneManager _instance;

    Timeline<GameMessage> _cutsceneMsgs;
    GameObject _prevCamTarget;
    bool _isInCutscene;
    const float MAX_CUTSCENE_DIST = 20.0f;
    
    void Awake ()
    {
        _instance = this;

        _cutsceneMsgs = Sync.CreateEvent<GameMessage>();
    }

    void OnSpawn ()
    {
        if (Game.IsClient)
            _cutsceneMsgs.EntryPassed += OnCutsceneStateChanged;
    }

    public void StartCutscene (Vector3 focus)
    {
        if (!Game.IsServer)
            return;

        var startMsg = new GameMessage();
        startMsg.Write(true);
        startMsg.Write(focus);

        _cutsceneMsgs[0] = startMsg;
        _isInCutscene = true;

        if (CutsceneStarted != null)
            CutsceneStarted(focus);
    }

    public void StopCutscene ()
    {
        if (!Game.IsServer)
            return;
        
        var stopMsg = new GameMessage();
        stopMsg.Write(false);;

        _cutsceneMsgs[0] = stopMsg;
        _isInCutscene = false;
        
        if (CutsceneFinished != null)
            CutsceneFinished();
    }

    void OnCutsceneStateChanged (Timeline<GameMessage> timeline, TimelineEntry<GameMessage> entry)
    {
        var msg = entry.Value;
        bool start = msg.ReadBoolean();

        if (start)
        {
            var focus = msg.ReadVector3();
            transform.position = focus;

            if (Vector2.Distance((Vector2)Cameraman.Instance.transform.position, (Vector2)transform.position) > MAX_CUTSCENE_DIST)
                return;

            _prevCamTarget = Cameraman.Instance.Target;
            Cameraman.Instance.Follow(this);

            if (!entry.IsNew)
                Cameraman.Instance.SnapToTarget();

            _isInCutscene = true;

            if (CutsceneStarted != null)
                CutsceneStarted(focus);
        }
        else
        {   
            if (!_isInCutscene)
                return;
                
            if (_prevCamTarget != null)
                Cameraman.Instance.Follow(_prevCamTarget);
            else Cameraman.Instance.StopFollowing();

            _isInCutscene = false;

            if (CutsceneFinished != null)
                CutsceneFinished();
        }

        msg.FinishReading();
    }

    void OnDestroy ()
    {
        if (_instance == this)
            _instance = null;
    }
}