Sandbox refactoring.

Author: MelvMay-Unity

LowLevel/Sandbox/Assets/Editor/SandboxManagerEditor.cs

@@ -1,4 +1,5 @@
 using System.Linq;
+using UnityEditor.UIElements;
 using UnityEngine.UIElements;
 
 namespace UnityEditor
@@ -19,12 +20,13 @@ public override VisualElement CreateInspectorGUI()
 
             // Add Start Scene.
             var sandboxManager = (target as SandboxManager);
-            var sceneItems = sandboxManager.GetComponent<SceneManifest>().SceneItems;
+            var sceneItems = sandboxManager?.GetComponent<SceneManifest>().SceneItems;
             var sceneNames = sceneItems.Select(item => item.Name).ToList();
+            sceneNames.Sort();
             var sceneNamesField = new DropdownField { label = m_StartSceneNameProperty.displayName, choices = sceneNames, bindingPath = m_StartSceneNameProperty.propertyPath };
             root.Add(sceneNamesField);
 
-            UIHelpers.FillDefaultInspector(root, serializedObject, this, m_StartSceneNameProperty.propertyPath);
+            InspectorElement.FillDefaultInspector(root, serializedObject, this, m_StartSceneNameProperty.propertyPath);
 
             return root;
         }

LowLevel/Sandbox/Assets/Editor/UIHelpers.cs

@@ -196,9 +196,9 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 633824030}
-  - component: {fileID: 633824029}
   - component: {fileID: 633824032}
   - component: {fileID: 633824031}
+  - component: {fileID: 633824029}
   m_Layer: 0
   m_Name: MainMenu
   m_TagString: Untagged
@@ -468,7 +468,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 9b6ebc245ff03b44289ea91c3f012973, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  StartScene: Shooter
+  StartScene: Large World
   DebuggingMenu: {fileID: 1603435387}
   ShortcutMenu: {fileID: 465066520}
   UpdatePeriodFPS: 0.1

LowLevel/Sandbox/Assets/Editor/UIHelpers.cs.meta

@@ -22,7 +22,7 @@ public float CameraZoom
         set => m_CameraZoomElement.value = value;
     }
 
-    public bool ColorShapeState { get; private set; }
+    private bool ColorShapeState { get; set; }
 
     public string StartScene = string.Empty;
     public Action SceneResetAction;