Level Selection related stuff added

Assets/Scripts/Level.meta

@@ -0,0 +1,8 @@
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Assets/Scripts/Level/Level.cs

@@ -0,0 +1,44 @@
+using UnityEngine;
+
+namespace Level
+{
+    public class Level : MonoBehaviour
+    {
+        public const string ResourcesDirectory = "Levels/";
+        public string LevelName { get; private set; } = "";
+
+        public Transform StartingPoint { get; private set; } = null;
+
+        private GameObject prefab = null;
+        private GameObject instance = null;
+        private bool needsRestart = true;
+
+        public void SetLevel(string levelName)
+        {
+            LevelName = levelName;
+
+            prefab = Resources.Load<GameObject>($"{ ResourcesDirectory }{ levelName }");
+            Disable();
+        }
+
+        public void Enable()
+        {
+            gameObject.SetActive(true);
+            needsRestart = true;
+        }
+
+        public void Disable()
+        {
+            if (!needsRestart)
+                return;
+
+            if (instance != null)
+                Destroy(instance);
+
+            instance = Instantiate(prefab, transform.position, Quaternion.identity, transform);
+            StartingPoint = instance.transform.Find("Starting Point");
+            gameObject.SetActive(false);
+            needsRestart = false;
+        }
+    }
+}

Assets/Scripts/Level/Level.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Level/LevelManager.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using UI;
+using UnityEngine;
+
+namespace Level
+{
+    public class LevelManager : MonoBehaviour
+    {
+        private static LevelManager _instance = null;
+        public static LevelManager Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    GameObject gameObject = new GameObject("Level Manager");
+                    _instance = gameObject.AddComponent<LevelManager>();
+                    _instance.Initialize();
+                }
+
+                return _instance;
+            }
+        }
+
+        private Dictionary<string, Level> _levels = null;
+        public Dictionary<string, Level> Levels
+        {
+            get
+            {
+                if (_levels == null)
+                    Initialize();
+
+                return _levels;
+            }
+        }
+
+        private Level currentLevel = null;
+
+        private void Awake()
+        {
+            if (_instance == null)
+                _instance = this;
+
+            if (_instance != this)
+                Destroy(this);
+        }
+
+        private void Initialize()
+        {
+            GameObject[] levelPrefabs = Resources.LoadAll<GameObject>("Levels/");
+            Transform levelContainer = new GameObject("Levels").transform;
+            _levels = new Dictionary<string, Level>(levelPrefabs.Length);
+
+            System.Array.Sort(levelPrefabs, (x, y) => Int32.Parse(x.name).CompareTo(Int32.Parse(y.name)));
+
+            GameObject levelInstance = null;
+            Level level = null;
+            foreach (GameObject levelPrefab in levelPrefabs)
+            {
+                levelInstance = new GameObject(levelPrefab.gameObject.name);
+                levelInstance.transform.SetParent(levelContainer);
+                level = levelInstance.AddComponent<Level>();
+                level.SetLevel(levelPrefab.name);
+                _levels.Add(levelPrefab.gameObject.name, level);
+            }
+        }
+
+        public void SwitchToLevel(string levelName)
+        {
+            DisableAllLevels();
+
+            currentLevel = Levels[levelName];
+            currentLevel.Enable();
+
+            // TODO Move Player To currentLevel.StartingPoint
+
+            UIManager.Instance.CloseAllCanvases();
+        }
+
+        private void DisableAllLevels()
+        {
+            foreach (Level level in Levels.Values)
+                level.Disable();
+        }
+    }
+}

Assets/Scripts/Level/LevelManager.cs.meta

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Assets/Scripts/UI/LevelButton.cs

@@ -0,0 +1,16 @@
+using Level;
+using TMPro;
+using UnityEngine;
+
+namespace UI
+{
+    public class LevelButton : MonoBehaviour
+    {
+        private TMP_Text text = null;
+
+        private void Awake() => text = GetComponentInChildren<TMP_Text>();
+
+        public void SetLevel(string levelName) => text.text = levelName;
+        public void StartLevel() => LevelManager.Instance.SwitchToLevel(text.text);
+    }
+}

Assets/Scripts/UI/LevelButton.cs.meta

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Assets/Scripts/UI/LevelSelectionMenu.cs

@@ -0,0 +1,55 @@
+using System;
+using Level;
+using UnityEngine;
+
+namespace UI
+{
+    public class LevelSelectionMenu : MonoBehaviour
+    {
+        [SerializeField] private Vector2Int maxGridSize = Vector2Int.one;
+        private GameObject levelButtonPrefab = null;
+
+        private void Awake()
+        {
+            levelButtonPrefab = Resources.Load<GameObject>("UI/Level Button Variant");
+        }
+
+        private void Start()
+        {
+            LevelButton instance = null;
+
+            int rowIndex = 0;
+            int columnIndex = 0;
+            int i = 0;
+            int count = LevelManager.Instance.Levels.Values.Count;
+
+            RectTransform rectTransform = levelButtonPrefab.transform.GetComponent<RectTransform>();
+            float rowOffset = (int)(count / maxGridSize.x) * rectTransform.rect.height * 0.75f;
+            float columnOffset = -maxGridSize.x * rectTransform.rect.width * 0.75f;
+            if (maxGridSize.x % 2 == 1)
+                columnOffset += rectTransform.rect.width * 0.75f;
+
+            RectTransform instanceRectTransform = null;
+            Vector3 instancePosition = Vector3.zero;
+            foreach (var level in LevelManager.Instance.Levels.Values)
+            {
+                if (i > maxGridSize.x * maxGridSize.y)
+                    break;
+
+
+                rowIndex = i / maxGridSize.x;
+                columnIndex = i % maxGridSize.x;
+
+                instance = Instantiate(levelButtonPrefab, transform.position, Quaternion.identity, transform).GetComponent<LevelButton>();
+                instance.SetLevel(level.name);
+                instanceRectTransform = instance.transform.GetComponent<RectTransform>();
+
+                instancePosition.y = rowOffset - rowIndex * instanceRectTransform.rect.height * 1.5f;
+                instancePosition.x = columnOffset + columnIndex * instanceRectTransform.rect.width * 1.5f;
+                instanceRectTransform.localPosition = instancePosition;
+
+                i++;
+            }
+        }
+    }
+}

Assets/Scripts/UI/LevelSelectionMenu.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/UI/UIManager.cs

@@ -29,6 +29,8 @@ namespace UI
 
         public void CloseAllCanvases()
         {
+            Initialize();
+
             foreach (Canvas canvas in canvases.Values)
                 canvas.gameObject.SetActive(false);
         }