blob: b43ea995faf6b470335fbf07a2086a6b35f70ef7 [file] [log] [blame]
/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollingMomentumCalculatorMac.h"
#if PLATFORM(MAC)
#include <pal/spi/mac/NSScrollingMomentumCalculatorSPI.h>
namespace WebCore {
static bool gEnablePlatformMomentumScrollingPrediction = true;
std::unique_ptr<ScrollingMomentumCalculator> ScrollingMomentumCalculator::create(const FloatSize& viewportSize, const FloatSize& contentSize, const FloatPoint& initialOffset, const FloatSize& initialDelta, const FloatSize& initialVelocity)
{
return makeUnique<ScrollingMomentumCalculatorMac>(viewportSize, contentSize, initialOffset, initialDelta, initialVelocity);
}
void ScrollingMomentumCalculator::setPlatformMomentumScrollingPredictionEnabled(bool enabled)
{
gEnablePlatformMomentumScrollingPrediction = enabled;
}
ScrollingMomentumCalculatorMac::ScrollingMomentumCalculatorMac(const FloatSize& viewportSize, const FloatSize& contentSize, const FloatPoint& initialOffset, const FloatSize& initialDelta, const FloatSize& initialVelocity)
: ScrollingMomentumCalculator(viewportSize, contentSize, initialOffset, initialDelta, initialVelocity)
{
}
FloatPoint ScrollingMomentumCalculatorMac::scrollOffsetAfterElapsedTime(Seconds elapsedTime)
{
if (!requiresMomentumScrolling())
return { retargetedScrollOffset().width(), retargetedScrollOffset().height() };
return [ensurePlatformMomentumCalculator() positionAfterDuration:elapsedTime.value()];
}
FloatSize ScrollingMomentumCalculatorMac::predictedDestinationOffset()
{
if (!gEnablePlatformMomentumScrollingPrediction)
return ScrollingMomentumCalculator::predictedDestinationOffset();
ensurePlatformMomentumCalculator();
return { m_initialDestinationOrigin.x(), m_initialDestinationOrigin.y() };
}
void ScrollingMomentumCalculatorMac::retargetedScrollOffsetDidChange()
{
_NSScrollingMomentumCalculator *calculator = ensurePlatformMomentumCalculator();
calculator.destinationOrigin = NSMakePoint(retargetedScrollOffset().width(), retargetedScrollOffset().height());
[calculator calculateToReachDestination];
}
Seconds ScrollingMomentumCalculatorMac::animationDuration()
{
if (!requiresMomentumScrolling())
return 0_s;
return Seconds([ensurePlatformMomentumCalculator() durationUntilStop]);
}
bool ScrollingMomentumCalculatorMac::requiresMomentumScrolling()
{
if (m_requiresMomentumScrolling == WTF::nullopt)
m_requiresMomentumScrolling = m_initialScrollOffset != retargetedScrollOffset() || m_initialVelocity.area();
return m_requiresMomentumScrolling.value();
}
_NSScrollingMomentumCalculator *ScrollingMomentumCalculatorMac::ensurePlatformMomentumCalculator()
{
if (m_platformMomentumCalculator)
return m_platformMomentumCalculator.get();
NSPoint origin = NSMakePoint(m_initialScrollOffset.width(), m_initialScrollOffset.height());
NSRect contentFrame = NSMakeRect(0, 0, m_contentSize.width(), m_contentSize.height());
NSPoint velocity = NSMakePoint(m_initialVelocity.width(), m_initialVelocity.height());
m_platformMomentumCalculator = adoptNS([[_NSScrollingMomentumCalculator alloc] initWithInitialOrigin:origin velocity:velocity documentFrame:contentFrame constrainedClippingOrigin:NSZeroPoint clippingSize:m_viewportSize tolerance:NSMakeSize(1, 1)]);
m_initialDestinationOrigin = [m_platformMomentumCalculator destinationOrigin];
return m_platformMomentumCalculator.get();
}
} // namespace WebCore
#endif // PLATFORM(MAC)