1 files changed, 48 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/KeyboardScrollAction.h b/gfx/layers/apz/src/KeyboardScrollAction.h
new file mode 100644
index 0000000000..780006c1b3
--- /dev/null
+++ b/gfx/layers/apz/src/KeyboardScrollAction.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_layers_KeyboardScrollAction_h
+#define mozilla_layers_KeyboardScrollAction_h
+
+#include <cstdint>  // for uint8_t
+
+#include "mozilla/ScrollTypes.h"
+#include "mozilla/DefineEnum.h"  // for MOZ_DEFINE_ENUM
+
+namespace mozilla {
+namespace layers {
+
+/**
+ * This class represents a scrolling action to be performed on a scrollable
+ * layer.
+ */
+struct KeyboardScrollAction final {
+ public:
+  // clang-format off
+  MOZ_DEFINE_ENUM_WITH_BASE_AT_CLASS_SCOPE(
+    KeyboardScrollActionType, uint8_t, (
+      eScrollCharacter,
+      eScrollLine,
+      eScrollPage,
+      eScrollComplete
+  ));
+  // clang-format on
+
+  static ScrollUnit GetScrollUnit(KeyboardScrollActionType aDeltaType);
+
+  KeyboardScrollAction();
+  KeyboardScrollAction(KeyboardScrollActionType aType, bool aForward);
+
+  // The type of scroll to perform for this action
+  KeyboardScrollActionType mType;
+  // Whether to scroll forward or backward along the axis of this action type
+  bool mForward;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_KeyboardScrollAction_h