1 files changed, 46 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..b83d0d9ecb
--- /dev/null
+++ b/gfx/layers/apz/util/TouchActionHelper.h
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+/* -*- 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 nsIWidget;
+namespace mozilla {
+
+namespace dom {
+class Document;
+}  // namespace dom
+
+class WidgetTouchEvent;
+}  // namespace mozilla
+
+namespace mozilla::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 touch
+   * points of aEvent 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 nsTArray<TouchBehaviorFlags> GetAllowedTouchBehavior(
+      nsIWidget* aWidget, dom::Document* aDocument,
+      const WidgetTouchEvent& aPoint);
+
+  static TouchBehaviorFlags GetAllowedTouchBehaviorForFrame(nsIFrame* aFrame);
+};
+
+}  // namespace mozilla::layers
+
+#endif /*__mozilla_layers_TouchActionHelper_h__ */