129 lines
4.0 KiB
C++
129 lines
4.0 KiB
C++
/*
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* Copyright (C) 2015-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "WheelEventDeltaFilter.h"
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#include "FloatSize.h"
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#include "Logging.h"
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#include <wtf/text/TextStream.h>
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#if PLATFORM(MAC)
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#include "WheelEventDeltaFilterMac.h"
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#endif
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namespace WebCore {
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WheelEventDeltaFilter::WheelEventDeltaFilter() = default;
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WheelEventDeltaFilter::~WheelEventDeltaFilter() = default;
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std::unique_ptr<WheelEventDeltaFilter> WheelEventDeltaFilter::create()
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{
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#if PLATFORM(MAC)
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return makeUnique<WheelEventDeltaFilterMac>();
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#else
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return makeUnique<BasicWheelEventDeltaFilter>();
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#endif
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}
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bool WheelEventDeltaFilter::isFilteringDeltas() const
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{
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return m_isFilteringDeltas;
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}
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FloatSize WheelEventDeltaFilter::filteredDelta() const
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{
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return m_currentFilteredDelta;
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}
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FloatSize WheelEventDeltaFilter::filteredVelocity() const
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{
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return m_currentFilteredVelocity;
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}
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BasicWheelEventDeltaFilter::BasicWheelEventDeltaFilter()
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: WheelEventDeltaFilter()
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{
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}
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const size_t basicWheelEventDeltaFilterWindowSize = 3;
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void BasicWheelEventDeltaFilter::updateFromDelta(const FloatSize& delta)
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{
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m_currentFilteredDelta = delta;
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if (!m_isFilteringDeltas)
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return;
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m_recentWheelEventDeltas.append(delta);
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if (m_recentWheelEventDeltas.size() > basicWheelEventDeltaFilterWindowSize)
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m_recentWheelEventDeltas.removeFirst();
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DominantScrollGestureDirection scrollDirection = dominantScrollGestureDirection();
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if (scrollDirection == DominantScrollGestureDirection::Vertical)
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m_currentFilteredDelta.setWidth(0);
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else if (scrollDirection == DominantScrollGestureDirection::Horizontal)
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m_currentFilteredDelta.setHeight(0);
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}
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void BasicWheelEventDeltaFilter::beginFilteringDeltas()
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{
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m_recentWheelEventDeltas.clear();
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m_isFilteringDeltas = true;
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}
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void BasicWheelEventDeltaFilter::endFilteringDeltas()
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{
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m_currentFilteredDelta = FloatSize(0, 0);
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m_isFilteringDeltas = false;
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}
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static inline bool deltaIsPredominantlyVertical(const FloatSize& delta)
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{
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return fabs(delta.height()) > fabs(delta.width());
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}
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DominantScrollGestureDirection BasicWheelEventDeltaFilter::dominantScrollGestureDirection() const
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{
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bool allVertical = m_recentWheelEventDeltas.size();
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bool allHorizontal = m_recentWheelEventDeltas.size();
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for (const auto& delta : m_recentWheelEventDeltas) {
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bool isVertical = deltaIsPredominantlyVertical(delta);
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allVertical &= isVertical;
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allHorizontal &= !isVertical;
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}
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if (allVertical)
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return DominantScrollGestureDirection::Vertical;
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if (allHorizontal)
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return DominantScrollGestureDirection::Horizontal;
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return DominantScrollGestureDirection::None;
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}
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};
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