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/*
* Copyright (C) 2025 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 "UnplacedGridItem.h"
#include "LayoutElementBox.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Layout {
UnplacedGridItem::UnplacedGridItem(const ElementBox& layoutBox, Style::GridPosition columnStart, Style::GridPosition columnEnd,
Style::GridPosition rowStart, Style::GridPosition rowEnd)
: m_layoutBox(layoutBox)
, m_columnPosition({ columnStart, columnEnd })
, m_rowPosition({ rowStart, rowEnd })
{
}
UnplacedGridItem::UnplacedGridItem(WTF::HashTableEmptyValueType)
: m_layoutBox(WTF::HashTableEmptyValue)
, m_columnPosition({ RenderStyle::initialGridItemColumnStart(), RenderStyle::initialGridItemColumnEnd() })
, m_rowPosition({ RenderStyle::initialGridItemRowStart(), RenderStyle::initialGridItemRowEnd() })
{
}
int UnplacedGridItem::explicitColumnStart() const
{
ASSERT(m_columnPosition.first.isExplicit());
auto explicitColumnStart = m_columnPosition.first.explicitPosition();
if (explicitColumnStart > 0)
return explicitColumnStart - 1;
ASSERT_NOT_IMPLEMENTED_YET();
return { };
}
int UnplacedGridItem::explicitColumnEnd() const
{
ASSERT(m_columnPosition.second.isExplicit());
auto explicitColumnEnd = m_columnPosition.second.explicitPosition();
if (explicitColumnEnd > 0)
return explicitColumnEnd - 1;
ASSERT_NOT_IMPLEMENTED_YET();
return { };
}
int UnplacedGridItem::explicitRowStart() const
{
ASSERT(m_rowPosition.first.isExplicit());
auto explicitRowStart = m_rowPosition.first.explicitPosition();
if (explicitRowStart > 0)
return explicitRowStart - 1;
ASSERT_NOT_IMPLEMENTED_YET();
return { };
}
int UnplacedGridItem::explicitRowEnd() const
{
ASSERT(m_rowPosition.second.isExplicit());
auto explicitRowEnd = m_rowPosition.second.explicitPosition();
if (explicitRowEnd > 0)
return explicitRowEnd - 1;
ASSERT_NOT_IMPLEMENTED_YET();
return { };
}
bool UnplacedGridItem::hasDefiniteRowPosition() const
{
return m_rowPosition.first.isExplicit() || m_rowPosition.second.isExplicit();
}
bool UnplacedGridItem::hasDefiniteColumnPosition() const
{
return m_columnPosition.first.isExplicit() || m_columnPosition.second.isExplicit();
}
bool UnplacedGridItem::hasAutoColumnPosition() const
{
return m_columnPosition.first.isAuto() && m_columnPosition.second.isAuto();
}
size_t UnplacedGridItem::columnSpanSize() const
{
auto firstPosition = m_columnPosition.first;
auto secondPosition = m_columnPosition.second;
// Case 1: Both positions are explicit - calculate span size
if (firstPosition.isExplicit() && secondPosition.isExplicit()) {
auto spanSize = explicitColumnEnd() - explicitColumnStart();
return spanSize;
}
// Case 2: One position is a span - extract its span size.
ASSERT(!(firstPosition.isSpan() && secondPosition.isSpan()));
if (firstPosition.isSpan())
return firstPosition.spanPosition();
if (secondPosition.isSpan())
return secondPosition.spanPosition();
// Default to span 1
ASSERT(hasAutoColumnPosition());
return 1;
}
std::pair<int, int> UnplacedGridItem::definiteRowStartEnd() const
{
auto startPosition = m_rowPosition.first;
auto endPosition = m_rowPosition.second;
if (startPosition.isExplicit() && endPosition.isExplicit())
return { explicitRowStart(), explicitRowEnd() };
if (startPosition.isExplicit() && endPosition.isSpan())
return { explicitRowStart(), explicitRowStart() + endPosition.spanPosition() };
if (startPosition.isSpan() && endPosition.isExplicit())
return { explicitRowEnd() - startPosition.spanPosition(), explicitRowEnd() };
if (startPosition.isExplicit() && endPosition.isAuto())
return { explicitRowStart(), explicitRowStart() + 1 };
if (startPosition.isAuto() && endPosition.isExplicit()) {
auto explicitEnd = explicitRowEnd();
ASSERT(explicitEnd >= 1);
return { explicitEnd - 1, explicitEnd };
}
ASSERT_NOT_REACHED();
return { 0, 0 };
}
bool UnplacedGridItem::operator==(const UnplacedGridItem& other) const
{
// Since the hash table empty value uses CheckedRef's empty value,
// we need to check if either |this| or |other| are the empty value
// so we do not compare the uninitialized ref.
bool isEmpty = isHashTableEmptyValue();
if (isEmpty)
return other.isHashTableEmptyValue();
if (other.isHashTableEmptyValue())
return isEmpty;
return m_layoutBox.ptr() == other.m_layoutBox.ptr() && m_columnPosition == other.m_columnPosition && m_rowPosition == other.m_rowPosition;
}
void add(Hasher& hasher, const WebCore::Layout::UnplacedGridItem& unplacedGridItem)
{
addArgs(hasher, unplacedGridItem.m_layoutBox.ptr(), unplacedGridItem.m_columnPosition, unplacedGridItem.m_rowPosition);
}
} // namespace Layout
} // namespace WebCore
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