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/*
* Copyright (C) 2014-2015 Apple Inc. All rights reserved.
* Copyright (c) 2010, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "ScrollAnimator.h"
#include "FloatPoint.h"
#include "LayoutSize.h"
#include "PlatformWheelEvent.h"
#include "ScrollableArea.h"
#include <algorithm>
namespace WebCore {
#if !ENABLE(SMOOTH_SCROLLING) && !PLATFORM(IOS) && !PLATFORM(MAC)
std::unique_ptr<ScrollAnimator> ScrollAnimator::create(ScrollableArea& scrollableArea)
{
return std::make_unique<ScrollAnimator>(scrollableArea);
}
#endif
ScrollAnimator::ScrollAnimator(ScrollableArea& scrollableArea)
: m_scrollableArea(scrollableArea)
#if ENABLE(CSS_SCROLL_SNAP) || ENABLE(RUBBER_BANDING)
, m_scrollController(*this)
#endif
{
}
ScrollAnimator::~ScrollAnimator()
{
}
bool ScrollAnimator::scroll(ScrollbarOrientation orientation, ScrollGranularity, float step, float multiplier)
{
FloatPoint currentPosition = this->currentPosition();
FloatSize delta;
if (orientation == HorizontalScrollbar)
delta.setWidth(step * multiplier);
else
delta.setHeight(step * multiplier);
FloatPoint newPosition = FloatPoint(currentPosition + delta).constrainedBetween(m_scrollableArea.minimumScrollPosition(), m_scrollableArea.maximumScrollPosition());
if (currentPosition == newPosition)
return false;
m_currentPosition = newPosition;
notifyPositionChanged(newPosition - currentPosition);
return true;
}
void ScrollAnimator::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
{
FloatPoint newPositon = ScrollableArea::scrollPositionFromOffset(offset, toFloatSize(m_scrollableArea.scrollOrigin()));
FloatSize delta = newPositon - currentPosition();
m_currentPosition = newPositon;
notifyPositionChanged(delta);
updateActiveScrollSnapIndexForOffset();
}
#if ENABLE(CSS_SCROLL_SNAP)
#if PLATFORM(MAC)
bool ScrollAnimator::processWheelEventForScrollSnap(const PlatformWheelEvent& wheelEvent)
{
return m_scrollController.processWheelEventForScrollSnap(wheelEvent);
}
#endif
bool ScrollAnimator::activeScrollSnapIndexDidChange() const
{
return m_scrollController.activeScrollSnapIndexDidChange();
}
unsigned ScrollAnimator::activeScrollSnapIndexForAxis(ScrollEventAxis axis) const
{
return m_scrollController.activeScrollSnapIndexForAxis(axis);
}
#endif
bool ScrollAnimator::handleWheelEvent(const PlatformWheelEvent& e)
{
#if ENABLE(CSS_SCROLL_SNAP) && PLATFORM(MAC)
if (!m_scrollController.processWheelEventForScrollSnap(e))
return false;
#endif
#if PLATFORM(COCOA)
// Events in the PlatformWheelEventPhaseMayBegin phase have no deltas, and therefore never passes through the scroll handling logic below.
// This causes us to return with an 'unhandled' return state, even though this event was successfully processed.
//
// We receive at least one PlatformWheelEventPhaseMayBegin when starting main-thread scrolling (see FrameView::wheelEvent), which can
// fool the scrolling thread into attempting to handle the scroll, unless we treat the event as handled here.
if (e.phase() == PlatformWheelEventPhaseMayBegin)
return true;
#endif
Scrollbar* horizontalScrollbar = m_scrollableArea.horizontalScrollbar();
Scrollbar* verticalScrollbar = m_scrollableArea.verticalScrollbar();
// Accept the event if we have a scrollbar in that direction and can still
// scroll any further.
float deltaX = horizontalScrollbar ? e.deltaX() : 0;
float deltaY = verticalScrollbar ? e.deltaY() : 0;
bool handled = false;
ScrollGranularity granularity = ScrollByPixel;
IntSize maxForwardScrollDelta = m_scrollableArea.maximumScrollPosition() - m_scrollableArea.scrollPosition();
IntSize maxBackwardScrollDelta = m_scrollableArea.scrollPosition() - m_scrollableArea.minimumScrollPosition();
if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
|| (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
|| (deltaY < 0 && maxForwardScrollDelta.height() > 0)
|| (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
handled = true;
if (deltaY) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaY < 0;
deltaY = Scrollbar::pageStepDelta(m_scrollableArea.visibleHeight());
if (negative)
deltaY = -deltaY;
}
scroll(VerticalScrollbar, granularity, verticalScrollbar->pixelStep(), -deltaY);
}
if (deltaX) {
if (e.granularity() == ScrollByPageWheelEvent) {
bool negative = deltaX < 0;
deltaX = Scrollbar::pageStepDelta(m_scrollableArea.visibleWidth());
if (negative)
deltaX = -deltaX;
}
scroll(HorizontalScrollbar, granularity, horizontalScrollbar->pixelStep(), -deltaX);
}
}
return handled;
}
#if ENABLE(TOUCH_EVENTS)
bool ScrollAnimator::handleTouchEvent(const PlatformTouchEvent&)
{
return false;
}
#endif
void ScrollAnimator::setCurrentPosition(const FloatPoint& position)
{
m_currentPosition = position;
updateActiveScrollSnapIndexForOffset();
}
void ScrollAnimator::updateActiveScrollSnapIndexForOffset()
{
#if ENABLE(CSS_SCROLL_SNAP)
// FIXME: Needs offset/position disambiguation.
m_scrollController.setActiveScrollSnapIndicesForOffset(m_currentPosition.x(), m_currentPosition.y());
if (m_scrollController.activeScrollSnapIndexDidChange()) {
m_scrollableArea.setCurrentHorizontalSnapPointIndex(m_scrollController.activeScrollSnapIndexForAxis(ScrollEventAxis::Horizontal));
m_scrollableArea.setCurrentVerticalSnapPointIndex(m_scrollController.activeScrollSnapIndexForAxis(ScrollEventAxis::Vertical));
}
#endif
}
void ScrollAnimator::notifyPositionChanged(const FloatSize& delta)
{
UNUSED_PARAM(delta);
// FIXME: need to not map back and forth all the time.
m_scrollableArea.setScrollOffsetFromAnimation(m_scrollableArea.scrollOffsetFromPosition(roundedIntPoint(currentPosition())));
}
#if ENABLE(CSS_SCROLL_SNAP)
void ScrollAnimator::updateScrollSnapState()
{
m_scrollController.updateScrollSnapState(m_scrollableArea);
}
LayoutUnit ScrollAnimator::scrollOffsetOnAxis(ScrollEventAxis axis) const
{
return axis == ScrollEventAxis::Horizontal ? m_currentPosition.x() : m_currentPosition.y();
}
void ScrollAnimator::immediateScrollOnAxis(ScrollEventAxis axis, float delta)
{
FloatSize deltaSize;
if (axis == ScrollEventAxis::Horizontal)
deltaSize.setWidth(delta);
else
deltaSize.setHeight(delta);
scrollToOffsetWithoutAnimation(currentPosition() + deltaSize);
}
LayoutSize ScrollAnimator::scrollExtent() const
{
return m_scrollableArea.contentsSize();
}
#endif
#if (ENABLE(CSS_SCROLL_SNAP) || ENABLE(RUBBER_BANDING)) && PLATFORM(MAC)
void ScrollAnimator::deferTestsForReason(WheelEventTestTrigger::ScrollableAreaIdentifier identifier, WheelEventTestTrigger::DeferTestTriggerReason reason) const
{
if (!m_wheelEventTestTrigger)
return;
m_wheelEventTestTrigger->deferTestsForReason(identifier, reason);
}
void ScrollAnimator::removeTestDeferralForReason(WheelEventTestTrigger::ScrollableAreaIdentifier identifier, WheelEventTestTrigger::DeferTestTriggerReason reason) const
{
if (!m_wheelEventTestTrigger)
return;
m_wheelEventTestTrigger->removeTestDeferralForReason(identifier, reason);
}
#endif
} // namespace WebCore
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