Project 2 - Starter Code

Starter Code:

These code file are included in the Project 2 Starter Assets

StateManager.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.SceneManagement;

///
/// CS2335 - Spring 2020
///  
/// <summary>
/// Game Scene. Matches Unity Scenes in Build Settings
/// YOU WILL ADD CODE FOR YOUR SCENES HERE
/// Scene Enums must match your Unity Scene Name
/// </summary>
public enum GameScene
{
    BeginScene = 0,
    EndScene = 1
}

/// <summary>
/// State manager.  Add comments
/// </summary>
public class StateManager : MonoBehaviour
{
    public static StateManager instanceRef;
    public IStateBase activeState;
    public GameScene curScene;

    /// <summary>
    /// Create this singleton instance.
    /// Implement the Singleton Design Pattern - initialize managerInstance
    /// </summary>
    void Awake()
    {
        if (instanceRef == null)
        {
            instanceRef = this;
            DontDestroyOnLoad(gameObject);  //the gameObject this is attached to 
        }
        else
        {   //
            DestroyImmediate(gameObject);
            Debug.Log("Destroy GameObject");
        }

    }
    // Use this for initialization
    void Start()
    {
        activeState = new BeginState(); //must customize for your game
        curScene = activeState.Scene;
        activeState.InitializeObjectRefs();  //call to Initialize BeginState object references

        //next scene change - this event will call OnLevelFinishedLoading custom function
        SceneManager.sceneLoaded += OnLevelFinishedLoading;  //add function to sceneLoaded delegate
    }


    /// <summary>
    /// Switchs the state.
    /// </summary>
    /// <param name="newState">New state.</param>
    public void SwitchState(IStateBase newState)
    {
        activeState = newState;
        curScene = newState.Scene; //set scene based on newState's GameScene enum
        SceneManager.LoadScene(curScene.ToString()); //Use scene name
        //SceneManager.LoadScene( (int) curScene); //use Scene ID
        Debug.Log("Switch Scene/State to: " + curScene );
    }
    //Public method to switch state using nextScene enum
    public void SwitchState( GameScene nextScene )
    {
        switch (nextScene)
        {
            case GameScene.BeginScene:
                SwitchState(new BeginState());
                break;

            case GameScene.EndScene:
                SwitchState(new EndState());
                break;

            default:
                Debug.Log("No match on SwitchState - scene " + nextScene);
                    break;
        } //end switch-block
    } //end SwitchState


    //StateManager needs to know when a new scene has been loaded
    //then it can call: InitializeObjectRefs for the current state
    void OnLevelFinishedLoading(Scene scene, LoadSceneMode mode)
    {
        int sceneID = scene.buildIndex;
        if (sceneID == (int)curScene)
        {
            Debug.Log("New function in StateManager to initialize new scene objects - exectued");
            activeState.InitializeObjectRefs();
        }
        else
        {
            Debug.Log("Big Problems - Scene & State Mismatch");
            Debug.Log("LevelFinished Loading :Scene Loaded: " + sceneID + " ActiveState Scene Enum: " + activeState.Scene);
        }
    }

} //end class StateManager

IStateBase.cs

using UnityEngine;
using System.Collections;

///
/// CS2335 - Spring 19
///  
/// <summary>
/// I state base.  
/// Interface for all StateX.cs classes  
/// </summary>
public interface IStateBase
{
    /// <summary>
    /// Gets the scene number - enum
    /// </summary>
    /// <value>The scene.</value>
    GameScene Scene
    { // Inteface Property 
        get; //read-only
    }

    //all interface methods are public by default!
    ///<summary>
    /// Similar to Unity Start()  
    /// exectued once, after scene is loaded - called from StateManager
    /// Used to initialize object references - can be used to cache object references
    /// </summary>
    void InitializeObjectRefs();

} //end Interface: IStateBase

BeginState.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.SceneManagement; //add to all State Files

public class BeginState : IStateBase
{

    /// <summary>
    /// The scene.
    /// </summary>
    private GameScene scene;

    /// <summary>
    /// Gets the scene number - enum
    /// </summary>
    /// <value>The scene.</value>
    public GameScene Scene
    {
        get { return scene; }
    }

    //GameScene objectRefs
    private Button optionBtn1, optionBtn2;

    /// <summary>
    /// Initializes a new instance of the <see cref="BeginState"/> class.
    /// </summary>
    public BeginState()
    {
        scene = GameScene.BeginScene; //IMPORTANT:  make sure this matches Unity Scene Name
    }

    /// <summary>
    /// Similar to Unity Start() 
    /// exectued once, after scene is loaded - called from StateManager
    /// Used to initialize object references - can be used to cache object references
    /// </summary>
    public void InitializeObjectRefs()
    {
        optionBtn1 = GameObject.Find("ButtonOption1").GetComponent<Button>();
        optionBtn1.onClick.AddListener(LoadEndScene);

        Debug.Log("Initialize Refs - BeginState");
    }

    /// <summary>
    /// Event handler - called when endBtn is clicked
    /// Loads the end scene.
    /// public method can be executed by button onClick event
    /// </summary>
    public void LoadEndScene()
    {
        Debug.Log("Leaving BeginScene going to EndScene");
        StateManager.instanceRef.SwitchState(GameScene.EndScene);  
    }
} //end class BeginState

EndState.cs

Example code for a Scene_X_State class

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.SceneManagement; //add to all State Files

public class EndState : IStateBase
{

    private GameScene scene;

    //add commenets
    public GameScene Scene
    {
        get { return scene; }
    }

    //GameScene objectRefs
    private Button optionBtn1, optionBtn2;

    //constructor  // add comments
    public EndState()
    {
        scene = GameScene.EndScene;
    }


    //Like Start()  - executed once when scene is first loaded
    public void InitializeObjectRefs()
    {
        optionBtn1 = GameObject.Find("ButtonOption1").GetComponent<Button>();
        optionBtn1.onClick.AddListener(LoadBeginScene);
        Debug.Log("InitializeObj Refs - EndState");
    }


    public void LoadBeginScene()
    {
        Debug.Log("Leaving EndScene, going to BeginScene");
        StateManager.instanceRef.SwitchState(GameScene.BeginScene);

    }
} //end class:  EndState