Merge pull request #31 from CharlExMachina/Scene-Loading

Added custom inspector for GameScene ScriptableObjects

UOP1_Project/Assets/Scripts/Editor.meta

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UOP1_Project/Assets/Scripts/Editor/GameSceneEditor.cs.meta

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UOP1_Project/Assets/Scripts/Editor/GameSceneEditor.cs

+using System.IO;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+[CustomEditor(typeof(GameScene), true)]
+public class GameSceneEditor : Editor
+{
+    #region UI_Warnings
+
+    private const string noScenesWarning = "There are no scenes set for this level yet! Add a new scene with the dropdown below";
+    
+    #endregion
+
+    #region GUI_Styles
+
+    private GUIStyle headerLabelStyle;
+
+    #endregion
+    
+    // it holds a list of properties to hide from basic inspector
+    private static readonly string[] ExcludedProperties = {"m_Script", "sceneName"};
+    
+    private string[] sceneList;
+    private GameScene gameSceneTarget;
+
+    private void OnEnable()
+    {
+        gameSceneTarget = target as GameScene;
+        PopulateScenePicker();
+        InitializeGuiStyles();
+    }
+
+    public override void OnInspectorGUI()
+    {
+        EditorGUILayout.LabelField("Scene information", headerLabelStyle);
+        EditorGUILayout.Space();
+        DrawScenePicker();
+        DrawPropertiesExcluding(serializedObject, ExcludedProperties);
+    }
+
+    private void DrawScenePicker()
+    {
+        var sceneName = gameSceneTarget.sceneName;
+        EditorGUI.BeginChangeCheck();
+        var selectedScene = sceneList.ToList().IndexOf(sceneName);
+
+        if (selectedScene < 0)
+        {
+            EditorGUILayout.HelpBox(noScenesWarning, MessageType.Warning);
+        }
+        
+        selectedScene = EditorGUILayout.Popup("Scene", selectedScene, sceneList);
+        if (EditorGUI.EndChangeCheck())
+        {
+            Undo.RecordObject(target, "Changed selected scene");
+            gameSceneTarget.sceneName = sceneList[selectedScene];
+            MarkAllDirty();
+        }
+    }
+    
+    private void InitializeGuiStyles()
+    {
+        headerLabelStyle = new GUIStyle(EditorStyles.largeLabel)
+        {
+            fontStyle = FontStyle.Bold,
+            fontSize = 18, fixedHeight = 70.0f
+        };
+    }
+
+    /// <summary>
+    /// Populates the scene picker with scenes included in the game's build index
+    /// </summary>
+    private void PopulateScenePicker()
+    {
+        var sceneCount = SceneManager.sceneCountInBuildSettings;
+        sceneList = new string[sceneCount];
+        for (int i = 0; i < sceneCount; i++)
+        {
+            sceneList[i] = Path.GetFileNameWithoutExtension(SceneUtility.GetScenePathByBuildIndex(i));
+        }
+    }
+    
+    /// <summary>
+    /// Marks scenes as dirty so data can be saved
+    /// </summary>
+    private void MarkAllDirty()
+    {
+        EditorUtility.SetDirty(target);
+        EditorSceneManager.MarkAllScenesDirty();
+    }
+}