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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/APZUtils.h" // for TouchBehaviorFlags
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
{
private:
static void UpdateAllowedBehavior(uint32_t aTouchActionValue,
bool aConsiderPanning,
TouchBehaviorFlags& aOutBehavior);
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,
nsIFrame* aRootFrame,
const LayoutDeviceIntPoint& aPoint);
};
} // namespace layers
} // namespace mozilla
#endif /*__mozilla_layers_TouchActionHelper_h__ */
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