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/*
* Copyright (C) 2012 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 "ScrollingStateTree.h"
#if ENABLE(THREADED_SCROLLING)
namespace WebCore {
PassOwnPtr<ScrollingStateTree> ScrollingStateTree::create()
{
return adoptPtr(new ScrollingStateTree);
}
ScrollingStateTree::ScrollingStateTree()
: m_rootStateNode(ScrollingStateScrollingNode::create(this, 0))
, m_hasChangedProperties(false)
{
}
ScrollingStateTree::~ScrollingStateTree()
{
}
PassOwnPtr<ScrollingStateTree> ScrollingStateTree::commit()
{
// This function clones and resets the current state tree, but leaves the tree structure intact.
OwnPtr<ScrollingStateTree> treeStateClone = ScrollingStateTree::create();
treeStateClone->setRootStateNode(static_pointer_cast<ScrollingStateScrollingNode>(m_rootStateNode->cloneAndResetNode()));
// Copy the IDs of the nodes that have been removed since the last commit into the clone.
treeStateClone->m_nodesRemovedSinceLastCommit.swap(m_nodesRemovedSinceLastCommit);
// Now the clone tree has changed properties, and the original tree does not.
treeStateClone->m_hasChangedProperties = true;
m_hasChangedProperties = false;
return treeStateClone.release();
}
void ScrollingStateTree::removeNode(ScrollingStateNode* node)
{
ASSERT(m_rootStateNode);
m_rootStateNode->removeChild(node);
}
void ScrollingStateTree::didRemoveNode(ScrollingNodeID nodeID)
{
m_nodesRemovedSinceLastCommit.append(nodeID);
}
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
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