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/*
* Copyright (C) 2020 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 "ScrollingTreeGestureState.h"
#if ENABLE(ASYNC_SCROLLING)
#include "PlatformWheelEvent.h"
#include "ScrollingTree.h"
namespace WebCore {
ScrollingTreeGestureState::ScrollingTreeGestureState(ScrollingTree& scrollingTree)
: m_scrollingTree(scrollingTree)
{
}
void ScrollingTreeGestureState::receivedWheelEvent(const PlatformWheelEvent& event)
{
if (event.isGestureStart()) {
clearAllNodes();
return;
}
}
bool ScrollingTreeGestureState::handleGestureCancel(const PlatformWheelEvent& event)
{
if (event.isGestureCancel()) {
if (m_mayBeginNodeID)
m_scrollingTree.handleWheelEventPhase(*m_mayBeginNodeID, PlatformWheelEventPhase::Cancelled);
return true;
}
return false;
}
void ScrollingTreeGestureState::nodeDidHandleEvent(ScrollingNodeID nodeID, const PlatformWheelEvent& event)
{
switch (event.phase()) {
case PlatformWheelEventPhase::MayBegin:
m_mayBeginNodeID = nodeID;
m_scrollingTree.handleWheelEventPhase(nodeID, event.phase());
break;
case PlatformWheelEventPhase::Cancelled:
// We can get here for via handleWheelEventAfterMainThread(), in which case handleGestureCancel() was not called first.
handleGestureCancel(event);
break;
case PlatformWheelEventPhase::Began:
m_activeNodeID = nodeID;
m_scrollingTree.handleWheelEventPhase(nodeID, event.phase());
break;
case PlatformWheelEventPhase::Ended:
if (m_activeNodeID)
m_scrollingTree.handleWheelEventPhase(*m_activeNodeID, event.phase());
break;
case PlatformWheelEventPhase::Changed:
case PlatformWheelEventPhase::Stationary:
case PlatformWheelEventPhase::None:
break;
}
switch (event.momentumPhase()) {
case PlatformWheelEventPhase::MayBegin:
case PlatformWheelEventPhase::Cancelled:
ASSERT_NOT_REACHED();
break;
case PlatformWheelEventPhase::Began:
m_activeNodeID = nodeID;
m_scrollingTree.handleWheelEventPhase(nodeID, event.momentumPhase());
break;
case PlatformWheelEventPhase::Ended:
if (m_activeNodeID)
m_scrollingTree.handleWheelEventPhase(*m_activeNodeID, event.momentumPhase());
break;
case PlatformWheelEventPhase::Changed:
case PlatformWheelEventPhase::Stationary:
case PlatformWheelEventPhase::None:
break;
}
}
void ScrollingTreeGestureState::clearAllNodes()
{
m_mayBeginNodeID = 0;
m_activeNodeID = 0;
}
};
#endif // ENABLE(ASYNC_SCROLLING)
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