43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __mozilla_layers_TouchActionHelper_h__
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#define __mozilla_layers_TouchActionHelper_h__
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#include "mozilla/layers/APZUtils.h" // for TouchBehaviorFlags
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class nsIFrame;
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class nsIWidget;
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namespace mozilla {
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namespace layers {
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/*
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* Helper class to figure out the allowed touch behavior for frames, as per
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* the touch-action spec.
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*/
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class TouchActionHelper
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{
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private:
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static void UpdateAllowedBehavior(uint32_t aTouchActionValue,
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bool aConsiderPanning,
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TouchBehaviorFlags& aOutBehavior);
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public:
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/*
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* Performs hit testing on content, finds frame that corresponds to the aPoint and retrieves
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* touch-action css property value from it according the rules specified in the spec:
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* http://www.w3.org/TR/pointerevents/#the-touch-action-css-property.
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*/
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static TouchBehaviorFlags GetAllowedTouchBehavior(nsIWidget* aWidget,
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nsIFrame* aRootFrame,
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const LayoutDeviceIntPoint& aPoint);
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};
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} // namespace layers
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} // namespace mozilla
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#endif /*__mozilla_layers_TouchActionHelper_h__ */
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