1 files changed, 39 insertions, 0 deletions
diff --git a/gfx/layers/apz/util/TouchActionHelper.h b/gfx/layers/apz/util/TouchActionHelper.h
new file mode 100644
index 0000000000..723b276997
--- /dev/null
+++ b/gfx/layers/apz/util/TouchActionHelper.h
@@ -0,0 +1,39 @@
+/* -*- 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_TouchActionHelper_h__
+#define __mozilla_layers_TouchActionHelper_h__
+
+#include "mozilla/layers/LayersTypes.h"  // for TouchBehaviorFlags
+#include "RelativeTo.h"                  // for RelativeTo
+
+class nsIFrame;
+class nsIWidget;
+
+namespace mozilla {
+namespace layers {
+
+/*
+ * Helper class to figure out the allowed touch behavior for frames, as per
+ * the touch-action spec.
+ */
+class TouchActionHelper {
+ public:
+  /*
+   * Performs hit testing on content, finds frame that corresponds to the aPoint
+   * and retrieves touch-action css property value from it according the rules
+   * specified in the spec:
+   * http://www.w3.org/TR/pointerevents/#the-touch-action-css-property.
+   */
+  static TouchBehaviorFlags GetAllowedTouchBehavior(
+      nsIWidget* aWidget, RelativeTo aRootFrame,
+      const LayoutDeviceIntPoint& aPoint);
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /*__mozilla_layers_TouchActionHelper_h__ */