fix: #22

Store changes into editor preferences.

Packages/bullet-storm-unity/Scripts/Editor/BulletStormEditorUtil.cs

@@ -22,7 +22,7 @@ internal static class BulletStormEditorUtil
         /// <returns>Information to draw gizmos.</returns>
         public static void DrawShapePreview(Shape shape, [NotNull] Camera camera, LabelContent content)
         {
-            if (shape is null || !Caches.Instance.shapePreviewMesh || !Caches.Instance.shapePreviewMaterial) return;
+            if (shape is null || !Preferences._.shapePreviewMesh || !Preferences._.shapePreviewMaterial) return;
 
             var prs = new List<Tuple<Vector3, Quaternion, float>>();
 
@@ -39,8 +39,8 @@ public static void DrawShapePreview(Shape shape, [NotNull] Camera camera, LabelC
                 var block = new MaterialPropertyBlock();
                 block.SetColor(ColorIndex, shape[i].DefaultColor ? Color.white : shape[i].color);
 
-                Graphics.DrawMesh(Caches.Instance.shapePreviewMesh, Matrix4x4.TRS(position, lookRotation, size),
-                    Caches.Instance.shapePreviewMaterial, 0, camera, 0, block);
+                Graphics.DrawMesh(Preferences._.shapePreviewMesh, Matrix4x4.TRS(position, lookRotation, size),
+                    Preferences._.shapePreviewMaterial, 0, camera, 0, block);
 
                 prs.Add(new Tuple<Vector3, Quaternion, float>(position, lookRotation, speed));
             }

Packages/bullet-storm-unity/Scripts/Editor/CustomEditors/ShapePreviewer.cs

@@ -1,4 +1,5 @@
 using CANStudio.BulletStorm.Emission;
+using CANStudio.BulletStorm.Util;
 using CANStudio.BulletStorm.XNodes;
 using CANStudio.BulletStorm.XNodes.ShapeNodes;
 using UnityEditor;
@@ -37,10 +38,14 @@ public override void OnPreviewSettings()
             labelContent =
                 (BulletStormEditorUtil.LabelContent) EditorGUILayout.EnumPopup("Label content", labelContent);
 
-            Caches.Instance.shapePreviewMesh =
-                EditorGUILayout.ObjectField(Caches.Instance.shapePreviewMesh, typeof(Mesh), false) as Mesh;
-            Caches.Instance.shapePreviewMaterial =
-                EditorGUILayout.ObjectField(Caches.Instance.shapePreviewMaterial, typeof(Material), false) as Material;
+            EditorGUI.BeginChangeCheck();
+
+            Preferences._.shapePreviewMesh =
+                EditorGUILayout.ObjectField(Preferences._.shapePreviewMesh, typeof(Mesh), false) as Mesh;
+            Preferences._.shapePreviewMaterial =
+                EditorGUILayout.ObjectField(Preferences._.shapePreviewMaterial, typeof(Material), false) as Material;
+
+            if (EditorGUI.EndChangeCheck()) Preferences.ApplyChanges();
         }
 
         protected void OnEnable()

Packages/bullet-storm-unity/Scripts/Editor/Preferences.cs

@@ -0,0 +1,57 @@
+using System;
+using CANStudio.BulletStorm.Util;
+using UnityEditor;
+using UnityEngine;
+
+namespace CANStudio.BulletStorm.Editor
+{
+    /// <summary>
+    /// Static class for read and write editor preferences.
+    /// </summary>
+    public static class Preferences
+    {
+        /// <summary>
+        /// Access preferences.
+        /// </summary>
+        public static SerializedPreference _ => SerializedPreference.Load();
+
+        /// <summary>
+        /// Write all changes in preference to disk.
+        /// </summary>
+        public static void ApplyChanges() => _.Save();
+    }
+
+    [Serializable]
+    public class SerializedPreference
+    {
+        public Mesh shapePreviewMesh;
+        public Material shapePreviewMaterial;
+
+        private const string PreferenceKey = "BulletStorm_Preference";
+        private static readonly Lazy<SerializedPreference> Cached = new Lazy<SerializedPreference>(() =>
+        {
+            var json = EditorPrefs.GetString(PreferenceKey);
+            SerializedPreference preference = null;
+            try
+            {
+                preference = JsonUtility.FromJson<SerializedPreference>(json);
+            }
+            catch (Exception e)
+            {
+                BulletStormLogger.LogWarning($"{e} occured when loading preferences:\n" + e.StackTrace);
+            }
+
+            return preference ?? new SerializedPreference();
+        });
+
+        private SerializedPreference(){}
+
+        internal static SerializedPreference Load() => Cached.Value;
+
+        internal void Save()
+        {
+            var json = JsonUtility.ToJson(this);
+            EditorPrefs.SetString(PreferenceKey, json);
+        }
+    }
+}