diff -r 000000000000 -r 6474c204b198 widget/qt/nsBidiKeyboard.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/qt/nsBidiKeyboard.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <Qt>
+#include <QGuiApplication>
+
+#include "nsBidiKeyboard.h"
+
+NS_IMPL_ISUPPORTS(nsBidiKeyboard, nsIBidiKeyboard)
+
+nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard()
+{
+  Reset();
+}
+
+nsBidiKeyboard::~nsBidiKeyboard()
+{
+}
+
+NS_IMETHODIMP nsBidiKeyboard::Reset()
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(bool *aIsRTL)
+{
+    *aIsRTL = false;
+
+    QInputMethod* input = qApp->inputMethod();
+    Qt::LayoutDirection layoutDir = input ? input->inputDirection() : Qt::LeftToRight;
+
+    if (layoutDir == Qt::RightToLeft) {
+        *aIsRTL = true;
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsBidiKeyboard::GetHaveBidiKeyboards(bool* aResult)
+{
+  // not implemented yet
+  return NS_ERROR_NOT_IMPLEMENTED;
+}