1 files changed, 38 insertions, 0 deletions
diff --git a/app/assets/javascripts/content_editor/extensions/external_keydown_handler.js b/app/assets/javascripts/content_editor/extensions/external_keydown_handler.js
new file mode 100644
index 00000000000..e940614083e
--- /dev/null
+++ b/app/assets/javascripts/content_editor/extensions/external_keydown_handler.js
@@ -0,0 +1,38 @@
+import { Extension } from '@tiptap/core';
+import { Plugin, PluginKey } from 'prosemirror-state';
+import { KEYDOWN_EVENT } from '../constants';
+
+/**
+ * This extension bubbles up the keydown event, captured by ProseMirror in the
+ * contenteditale element, to the presentation layer implemented in vue.
+ *
+ * The purpose of this mechanism is allowing clients of the
+ * content editor to attach keyboard shortcuts for behavior outside
+ * of the Content Editor’s boundaries, i.e. submitting a form to save changes.
+ */
+export default Extension.create({
+  name: 'keyboardShortcut',
+  addOptions() {
+    return {
+      eventHub: null,
+    };
+  },
+  addProseMirrorPlugins() {
+    return [
+      new Plugin({
+        key: new PluginKey('keyboardShortcut'),
+        props: {
+          handleKeyDown: (_, event) => {
+            const {
+              options: { eventHub },
+            } = this;
+
+            eventHub.$emit(KEYDOWN_EVENT, event);
+
+            return false;
+          },
+        },
+      }),
+    ];
+  },
+});