Add `storage:store:before` event

src/editor/index.js

@@ -41,6 +41,7 @@
  * * `storage:start` - Before the storage request is started
  * * `storage:load` - Triggered when something was loaded from the storage, loaded object passed as an argumnet
  * * `storage:store` - Triggered when something is stored to the storage, stored object passed as an argumnet
+ * * `storage:store:before` - Before the store. The object to store is passed as an argumnet (which you can edit)
  * * `storage:end` - After the storage request is ended
  * * `storage:error` - On any error on storage request, passes the error as an argument
  * ## Canvas

src/storage_manager/index.js

@@ -11,6 +11,7 @@ module.exports = () => {
     LocalStorage = require('./model/LocalStorage'),
     RemoteStorage = require('./model/RemoteStorage');
 
+  let em;
   var storages = {};
   var defaultStorages = {};
 
@@ -42,6 +43,7 @@ module.exports = () => {
      */
     init(config) {
       c = config || {};
+      em = c.em;
 
       for (var name in defaults) {
         if (!(name in c)) c[name] = defaults[name];
@@ -171,12 +173,15 @@ module.exports = () => {
      * storageManager.store({item1: value1, item2: value2});
      * */
     store(data, clb) {
-      var st = this.get(this.getCurrent());
-      var dataF = {};
+      const st = this.get(this.getCurrent());
+      const toStore = {};
+      em && em.trigger('storage:store:before', data);
 
-      for (var key in data) dataF[c.id + key] = data[key];
+      for (let key in data) {
+        toStore[c.id + key] = data[key];
+      }
 
-      return st ? st.store(dataF, clb) : null;
+      return st ? st.store(toStore, clb) : null;
     },
 
     /**