finish integrating level selector

Level selector was already working after work by William but some small bugs remained to be fixed + it wasn't possible to return to level selector once we were in the level.

- it's now possible to go back to level selector from Level
- LevelManagerScript is no longer a singleton (this way, it resets with the Game scene unloading)
- Added a property drawer for using scene files in inspectors

Assets/Editor/LevelManagerEditor.cs

@@ -7,13 +7,16 @@ public class LevelManagerEditor : Editor
     public override void OnInspectorGUI()
     {
         DrawDefaultInspector();
-        if (GUILayout.Button("Save"))
+        if (Application.isPlaying)
         {
-            LevelManager.Instance.SaveFile();
+            if (GUILayout.Button("Save"))
-        }
+            {
-        if (GUILayout.Button("Load"))
+                LevelManager.Instance.SaveFile();
-        {
+            }
-            LevelManager.Instance.LoadFile();
+            if (GUILayout.Button("Load"))
+            {
+                LevelManager.Instance.LoadFile();
+            }
         }
     }
 }

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+  m_FillClockwise: 1
+  m_FillOrigin: 0
+  m_UseSpriteMesh: 0
+  m_PixelsPerUnitMultiplier: 1
+--- !u!222 &2064630366
+CanvasRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2064630362}
+  m_CullTransparentMesh: 1
+--- !u!114 &2064630367
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2064630362}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 5013085c123fae4499f80b0a896f63af, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  scene: LevelSelect
+  sceneAction: 0
+  loadSceneMode: 0

Assets/Scripts/ChangeScene.cs

@@ -0,0 +1,37 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class ChangeScene : MonoBehaviour
+{
+    [Scene]
+    public string scene;
+    public SceneActionType sceneAction;
+    public LoadSceneMode loadSceneMode;
+    public enum SceneActionType 
+    {
+        Load,
+        Unload
+    }
+    public void LoadScene()
+    {
+        if (sceneAction == SceneActionType.Load)
+        {
+            SceneManager.LoadScene(scene, loadSceneMode);
+        }
+        else if (sceneAction == SceneActionType.Unload)
+        {
+            for (int i = 0; i < SceneManager.sceneCount; i++) 
+            {
+                var scene = SceneManager.GetSceneAt(i);
+                if (scene.name == this.scene)
+                {
+                    SceneManager.UnloadSceneAsync(scene);
+                }
+            }
+            
+            
+        }
+    }
+}

Assets/Scripts/ChangeScene.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 5013085c123fae4499f80b0a896f63af
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs

@@ -5,7 +5,7 @@ public class ObjectPlaceholder : DraggablePlaceholder
     public GameObject Prefab { get; set; }
     public override void Place()
     {
-        Prefab.Create(transform.position);
+        Prefab.Create(transform.position, parent : LevelManager.Instance.LevelTransform);
     }
     public override bool CanBePlacedHere()
     {

Assets/Scripts/LevelEditor/TilemapData.cs

@@ -132,7 +132,12 @@ namespace GatherAndDefend.LevelEditor
 
             //get grid
             var grid = GameObject.FindObjectOfType<Grid>();
-            if (!grid) grid = new GameObject("Grid").AddComponent<Grid>();
+            if (!grid)
+            {
+                var levelMgrScript = GameObject.FindObjectOfType<LevelManagerScript>();
+                grid = new GameObject("Grid").AddComponent<Grid>();
+                grid.transform.SetParent(levelMgrScript.transform.parent);
+            }
 
             //get tilemap by name
             var tilemap = grid.GetComponentInChildren<Tilemap>(key);

Assets/Scripts/LevelManager/LevelManager.cs

@@ -96,8 +96,9 @@ public class LevelManager : Singleton<LevelManager>
 
     #region [Level management]
 
-    public void UpdateLevel()
+    public void AddAndRemoveObjects()
     {
+        //add and remove
         var toAdd = new List<ILevelObject>(_toAdd);
         toAdd.ForEach(addedObject =>
         {
@@ -113,27 +114,18 @@ public class LevelManager : Singleton<LevelManager>
             _levelObjects.Remove(removedObject);
             removedObject.LevelDestroy();
         });
+    }
+
+    public void UpdateLevel()
+    {
+        AddAndRemoveObjects();
 
         _levelObjects.ForEach(levelObject =>
         {
             levelObject.LevelUpdate();
         });
 
-        toAdd = new List<ILevelObject>(_toAdd);
+        AddAndRemoveObjects();
-        toAdd.ForEach(addedObject =>
-        {
-            _toAdd.Remove(addedObject);
-            _levelObjects.Add(addedObject);
-            addedObject.LevelStart();
-        });
-
-        toRemove = new List<ILevelObject>(_toRemove);
-        toRemove.ForEach(removedObject =>
-        {
-            _toRemove.Remove(removedObject);
-            _levelObjects.Remove(removedObject);
-            removedObject.LevelDestroy();
-        });
     }
 
     public void ClearLevel()
@@ -162,7 +154,9 @@ public class LevelManager : Singleton<LevelManager>
         //create new grid if there is none
         if (!grid)
         {
+            var levelMgrScript = Object.FindObjectOfType<LevelManagerScript>();
             grid = new GameObject("Grid").AddComponent<Grid>();
+            grid.transform.SetParent(levelMgrScript.transform);
         }
         //remove all tilemaps if there is a grid
         else
@@ -199,11 +193,6 @@ public class LevelManager : Singleton<LevelManager>
             ClearLevel();
         }
 
-        foreach (var ob in Database.Instance.ScriptableObjects)
-        {
-            Debug.Log(ob);
-        }
-
         //fetch level from database
         _currentLevel = Database.Instance.ScriptableObjects[levelName] as Level;
 
@@ -290,10 +279,5 @@ public class LevelManager : Singleton<LevelManager>
 
 
     }
-  
-    /// <summary>
-    /// align camera to the rightmost tile of the tilemap
-    /// </summary>
-   
     #endregion
 }

Assets/Scripts/LevelManager/LevelManagerScript.cs

@@ -1,14 +1,15 @@
 using UnityEngine;
-using GatherAndDefend.LevelEditor;
+using UnityEngine.SceneManagement;
-
+using Level = GatherAndDefend.LevelEditor.Level;
-public class LevelManagerScript : SingletonBehaviour<LevelManagerScript>
+public class LevelManagerScript : MonoBehaviour
 {
-    public Level firstLevel;
+    [Scene][SerializeField]
+    private string _gameScene;
+    [SerializeField]
+    private Level _firstLevel;
     private void Start()
     {
-        DontDestroyOnLoad(gameObject);
+        LevelManager.Instance.LevelTransform = transform;
-        if (!firstLevel) throw new System.Exception("there is no first level set in the level manager script");
-
         int levelToLoadFromWorldMap = PlayerPrefs.GetInt("LevelToLoad", -1);
         if (levelToLoadFromWorldMap != -1)
         {
@@ -16,8 +17,14 @@ public class LevelManagerScript : SingletonBehaviour<LevelManagerScript>
             LevelManager.Instance.LoadLevel(lvlName, true);
             return;
         }
-
+        else if (_firstLevel)
-        LevelManager.Instance.LoadLevel(firstLevel, true);
+        {
+            LevelManager.Instance.LoadLevel(_firstLevel, true);
+        }
+        else
+        {
+            Debug.LogWarning("there is no first level set in the level manager script");
+        }
     }
 
     void Update()

Assets/Scripts/SceneDrawer.cs

@@ -0,0 +1,55 @@
+using UnityEditor;
+using UnityEngine;
+
+
+public class SceneAttribute : PropertyAttribute { }
+
+[CustomPropertyDrawer(typeof(SceneAttribute))]
+public class SceneDrawer : PropertyDrawer
+{
+
+	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+	{
+
+		if (property.propertyType == SerializedPropertyType.String)
+		{
+			var sceneObject = GetSceneObject(property.stringValue);
+			var scene = EditorGUI.ObjectField(position, label, sceneObject, typeof(SceneAsset), true);
+			if (scene == null)
+			{
+				property.stringValue = "";
+			}
+			else if (scene.name != property.stringValue)
+			{
+				var sceneObj = GetSceneObject(scene.name);
+				if (sceneObj == null)
+				{
+					Debug.LogWarning("The scene " + scene.name + " cannot be used. To use this scene add it to the build settings for the project");
+				}
+				else
+				{
+					property.stringValue = scene.name;
+				}
+			}
+		}
+		else
+			EditorGUI.LabelField(position, label.text, "Use [Scene] with strings.");
+	}
+	protected SceneAsset GetSceneObject(string sceneObjectName)
+	{
+		if (string.IsNullOrEmpty(sceneObjectName))
+		{
+			return null;
+		}
+
+		foreach (var editorScene in EditorBuildSettings.scenes)
+		{
+			if (editorScene.path.IndexOf(sceneObjectName) != -1)
+			{
+				return AssetDatabase.LoadAssetAtPath(editorScene.path, typeof(SceneAsset)) as SceneAsset;
+			}
+		}
+		Debug.LogWarning("Scene [" + sceneObjectName + "] cannot be used. Add this scene to the 'Scenes in the Build' in build settings.");
+		return null;
+	}
+}

Assets/Scripts/SceneDrawer.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 389cc3c423055324fb8d7de50f62f709
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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Assets/Scripts/WorldMap/WorldMapManager.cs

@@ -16,6 +16,8 @@ public class WorldMapManager : MonoBehaviour
     private Sprite _lockedIcon;
     [SerializeField]
     private Sprite _savedIcon;
+    [Scene][SerializeField]
+    private string gameScene;
 
     private WorldMapSave _worldMapSave;
 
@@ -70,12 +72,10 @@ public class WorldMapManager : MonoBehaviour
 
     public void CallLevelWorld1(int levelToCall)
     {
-        string levelToGet = "1-" + levelToCall;
         if (_buttonList[levelToCall - 1].GetComponent<Image>().sprite.name != "worldmap_level_locked")
         {
             PlayerPrefs.SetInt("LevelToLoad", levelToCall);
-            SceneManager.LoadScene("Game");
+            SceneManager.LoadScene(gameScene);
-            //LevelManager.Instance.LoadLevel(levelToGet, true);
         }
     }
 }