add: basic copy paste functionality

Author: brunomikoski

Scripts/Editor/CopyCollectableUtils.cs

@@ -0,0 +1,33 @@
+using UnityEditor;
+
+namespace BrunoMikoski.ScriptableObjectCollections
+{
+    public static class CopyCollectableUtils
+    {
+        private static CollectableScriptableObject source;
+
+        public static void SetSource(CollectableScriptableObject targetSource)
+        {
+            source = targetSource;
+        }
+
+        public static bool CanPasteToTarget(CollectableScriptableObject target)
+        {
+            if (source == null)
+                return false;
+
+            return target.GetType() == source.GetType();
+        }
+        
+        public static void ApplySourceToStart(CollectableScriptableObject target)
+        {
+            if (source == null)
+                return;
+
+            Undo.RecordObject(target, "Paste Changes");
+            EditorUtility.CopySerializedManagedFieldsOnly(source, target);
+            EditorUtility.SetDirty(target);
+        }
+        
+    }
+}

Scripts/Editor/CopyCollectableUtils.cs.meta

@@ -382,6 +382,22 @@ private void DrawItem(int index)
                                 filteredSerializedList[index].ApplyModifiedProperties();
                         }
                     }
+
+                    using (new EditorGUILayout.HorizontalScope())
+                    {
+                        if (GUILayout.Button("Copy", EditorStyles.toolbarButton))
+                        {
+                            CopyCollectableUtils.SetSource(collectionItem);
+                        }
+
+                        using (new EditorGUI.DisabledScope(!CopyCollectableUtils.CanPasteToTarget(collectionItem)))
+                        {
+                            if (GUILayout.Button("Paste", EditorStyles.toolbarButton))
+                            {
+                                CopyCollectableUtils.ApplySourceToStart(collectionItem);
+                            }
+                        }
+                    }
                     EditorGUI.indentLevel--;
                 }
             }

Scripts/Editor/ScriptableObjectCollectionCustomEditor.cs

@@ -161,6 +161,7 @@ public CollectableScriptableObject AddNew(Type collectionType, string assetName
 
             this.Add(item);
             UnityEditor.AssetDatabase.CreateAsset(item, newFileName);
+            ObjectUtility.SetDirty(this);
             isReadyOnlyListDirty = true;
             return item;
         }