Fix support for Unity 2018.x

Author: arimger

Assets/Editor Toolbox/Editor/Editors/ToolboxScriptedImporterEditor.cs

@@ -1,5 +1,9 @@
 using UnityEditor;
+#if UNITY_2020_2_OR_NEWER
 using UnityEditor.AssetImporters;
+#else
+using UnityEditor.Experimental.AssetImporters;
+#endif
 
 namespace Toolbox.Editor.Editors
 {
@@ -15,11 +19,12 @@ public sealed override void OnInspectorGUI()
         public virtual void DrawCustomInspector()
         {
             Drawer.DrawEditor(serializedObject);
+#if UNITY_2020_2_OR_NEWER
             if (extraDataType != null)
             {
                 Drawer.DrawEditor(extraDataSerializedObject);
             }
-
+#endif
             ApplyRevertGUI();
         }
 

Assets/Editor Toolbox/Editor/ToolboxEditorSceneView.cs

@@ -39,12 +39,14 @@ private static List<GameObject> GetObjectsUnderCursor()
 
         private static void UpdateEventCallback()
         {
+#if UNITY_2019_1_OR_NEWER
             UnityEditor.SceneView.duringSceneGui -= SceneViewDuringSceneGUI;
 
             if (UseToolboxSceneView)
             {
                 UnityEditor.SceneView.duringSceneGui += SceneViewDuringSceneGUI;
             }
+#endif
         }
 
         private static void SceneViewDuringSceneGUI(UnityEditor.SceneView sceneView)

Assets/Examples/Editor/SampleScriptedImporter.cs

@@ -1,4 +1,5 @@
-using UnityEditor.AssetImporters;
+#if UNITY_2020_2_OR_NEWER
+using UnityEditor.AssetImporters;
 using UnityEngine;
 
 [ScriptedImporter(1, "sample")]
@@ -11,4 +12,5 @@ public class SampleScriptedImporter : ScriptedImporter
 
     public override void OnImportAsset(AssetImportContext ctx)
     { }
-}
+}
+#endif

Assets/Examples/Editor/SampleScriptedImporterEditor.cs

@@ -1,6 +1,8 @@
-using Toolbox.Editor.Editors;
+#if UNITY_2020_2_OR_NEWER
+using Toolbox.Editor.Editors;
 using UnityEditor;
 
 [CustomEditor(typeof(SampleScriptedImporter))]
 public class SampleScriptedImporterEditor : ToolboxScriptedImporterEditor
-{ }
+{ }
+#endif