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/*
* Copyright (C) 2021 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. ``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
* 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.
*/
#pragma once
#include "FormattingContext.h"
#include "LayoutElementBox.h"
namespace WebCore {
namespace Layout {
class LayoutContainingBlockChainIterator {
public:
LayoutContainingBlockChainIterator() = default;
LayoutContainingBlockChainIterator(const ElementBox*);
const ElementBox& operator*() const { return *m_current; }
const ElementBox* operator->() const { return m_current; }
LayoutContainingBlockChainIterator& operator++();
friend bool operator==(LayoutContainingBlockChainIterator, LayoutContainingBlockChainIterator) = default;
private:
const ElementBox* m_current { nullptr };
};
class LayoutContainingBlockChainIteratorAdapter {
public:
LayoutContainingBlockChainIteratorAdapter(const ElementBox&, const ElementBox* stayWithin = nullptr);
auto begin() { return LayoutContainingBlockChainIterator(&m_containingBlock); }
auto end() { return LayoutContainingBlockChainIterator(m_stayWithin); }
private:
const ElementBox& m_containingBlock;
const ElementBox* m_stayWithin { nullptr };
};
LayoutContainingBlockChainIteratorAdapter containingBlockChain(const Box&);
LayoutContainingBlockChainIteratorAdapter containingBlockChain(const Box&, const ElementBox& stayWithin);
LayoutContainingBlockChainIteratorAdapter containingBlockChainWithinFormattingContext(const Box&, const ElementBox& root);
inline LayoutContainingBlockChainIterator::LayoutContainingBlockChainIterator(const ElementBox* current)
: m_current(current)
{
}
inline LayoutContainingBlockChainIterator& LayoutContainingBlockChainIterator::operator++()
{
ASSERT(m_current);
m_current = m_current->isInitialContainingBlock() ? nullptr : &FormattingContext::containingBlock(*m_current);
return *this;
}
inline LayoutContainingBlockChainIteratorAdapter::LayoutContainingBlockChainIteratorAdapter(const ElementBox& containingBlock, const ElementBox* stayWithin)
: m_containingBlock(containingBlock)
, m_stayWithin(stayWithin)
{
}
inline LayoutContainingBlockChainIteratorAdapter containingBlockChain(const Box& layoutBox)
{
return LayoutContainingBlockChainIteratorAdapter(FormattingContext::containingBlock(layoutBox));
}
inline LayoutContainingBlockChainIteratorAdapter containingBlockChain(const Box& layoutBox, const ElementBox& stayWithin)
{
ASSERT(layoutBox.isDescendantOf(stayWithin));
return LayoutContainingBlockChainIteratorAdapter(FormattingContext::containingBlock(layoutBox), &stayWithin);
}
inline LayoutContainingBlockChainIteratorAdapter containingBlockChainWithinFormattingContext(const Box& layoutBox, const ElementBox& root)
{
ASSERT(root.establishesFormattingContext());
return containingBlockChain(layoutBox, root);
}
}
}
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