#include "config.h"
#include "FloatingState.h"
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "FormattingContext.h"
#include "LayoutBox.h"
#include "LayoutContainerBox.h"
#include "LayoutState.h"
#include "RuntimeEnabledFeatures.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(FloatingState);
FloatingState::FloatItem::FloatItem(const Box& layoutBox, Display::Box absoluteDisplayBox)
: m_layoutBox(makeWeakPtr(layoutBox))
, m_position(layoutBox.isLeftFloatingPositioned() ? Position::Left : Position::Right)
, m_absoluteDisplayBox(absoluteDisplayBox)
{
}
FloatingState::FloatItem::FloatItem(Position position, Display::Box absoluteDisplayBox)
: m_position(position)
, m_absoluteDisplayBox(absoluteDisplayBox)
{
}
FloatingState::FloatingState(LayoutState& layoutState, const ContainerBox& formattingContextRoot)
: m_layoutState(layoutState)
, m_formattingContextRoot(makeWeakPtr(formattingContextRoot))
{
}
void FloatingState::append(FloatItem floatItem)
{
ASSERT(is<ContainerBox>(*m_formattingContextRoot));
#if ASSERT_ENABLED
if (!RuntimeEnabledFeatures::sharedFeatures().layoutFormattingContextIntegrationEnabled()) {
ASSERT(m_floats.findMatching([&] (auto& entry) {
return entry.floatBox() == floatItem.floatBox();
}) == notFound);
}
#endif
if (m_floats.isEmpty())
return m_floats.append(floatItem);
auto isLeftPositioned = floatItem.isLeftPositioned();
auto horizontalMargin = floatItem.horizontalMargin();
auto hasNegativeHorizontalMargin = (isLeftPositioned && horizontalMargin.start < 0) || (!isLeftPositioned && horizontalMargin.end < 0);
if (!hasNegativeHorizontalMargin)
return m_floats.append(floatItem);
for (int i = m_floats.size() - 1; i >= 0; --i) {
auto& floatItem = m_floats[i];
if (isLeftPositioned != floatItem.isLeftPositioned())
continue;
if (floatItem.rectWithMargin().top() < floatItem.rectWithMargin().bottom())
continue;
if ((isLeftPositioned && floatItem.rectWithMargin().right() >= floatItem.rectWithMargin().right())
|| (!isLeftPositioned && floatItem.rectWithMargin().left() <= floatItem.rectWithMargin().left()))
return m_floats.insert(i + 1, floatItem);
}
return m_floats.insert(0, floatItem);
}
Optional<PositionInContextRoot> FloatingState::bottom(const ContainerBox& formattingContextRoot, Clear type) const
{
if (m_floats.isEmpty())
return { };
Optional<PositionInContextRoot> bottom;
for (auto& floatItem : m_floats) {
if (!floatItem.isInFormattingContextOf(formattingContextRoot))
continue;
if ((type == Clear::Left && !floatItem.isLeftPositioned())
|| (type == Clear::Right && floatItem.isLeftPositioned()))
continue;
auto floatsBottom = floatItem.rectWithMargin().bottom();
if (bottom) {
bottom = std::max<PositionInContextRoot>(*bottom, { floatsBottom });
continue;
}
bottom = PositionInContextRoot { floatsBottom };
}
return bottom;
}
Optional<PositionInContextRoot> FloatingState::top(const ContainerBox& formattingContextRoot) const
{
if (m_floats.isEmpty())
return { };
Optional<PositionInContextRoot> top;
for (auto& floatItem : m_floats) {
if (!floatItem.isInFormattingContextOf(formattingContextRoot))
continue;
auto floatTop = floatItem.rectWithMargin().top();
if (top) {
top = std::min<PositionInContextRoot>(*top, { floatTop });
continue;
}
top = PositionInContextRoot { floatTop };
}
return top;
}
}
}
#endif