helper class to preserve editor state between remounting the editor

src/utils/EditorStateTransfer.js

@@ -0,0 +1,49 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+ * Used while editing, to pass the event, and to preserve editor state
+ * from one editor instance to another the next when remounting the editor
+ * upon receiving the remote echo for an unsent event.
+ */
+export default class EditorStateTransfer {
+    constructor(event) {
+        this._event = event;
+        this._serializedParts = null;
+        this.caret = null;
+    }
+
+    setEditorState(caret, serializedParts) {
+        this._caret = caret;
+        this._serializedParts = serializedParts;
+    }
+
+    hasEditorState() {
+        return !!this._serializedParts;
+    }
+
+    getSerializedParts() {
+        return this._serializedParts;
+    }
+
+    getCaret() {
+        return this._caret;
+    }
+
+    getEvent() {
+        return this._event;
+    }
+}