feat(new-toolbars): initial implementation

react/features/toolbox/functions.web.js

@@ -99,6 +99,17 @@ export function getToolbarClassNames(props: Object) {
     };
 }
 
+/**
+ * Helper for getting the height of the toolbox.
+ *
+ * @returns {number} The height of the toolbox.
+ */
+export function getToolboxHeight() {
+    const toolbox = document.getElementById('new-toolbox');
+
+    return (toolbox && toolbox.clientHeight) || 0;
+}
+
 /**
  * Indicates if a toolbar button is enabled.
  *