Source/WebCore/rendering/RenderRubyBase.cpp

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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#include "config.h"

#include "RenderRubyBase.h"

#include "RenderChildIterator.h"
#include "RenderRubyRun.h"
#include "RenderRubyText.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(RenderRubyBase);

RenderRubyBase::RenderRubyBase(Document& document, RenderStyle&& style)
    : RenderBlockFlow(document, WTFMove(style))
    , m_initialOffset(0)
    , m_isAfterExpansion(true)
{
    setInline(false);
}

RenderRubyBase::~RenderRubyBase() = default;

bool RenderRubyBase::isChildAllowed(const RenderObject& child, const RenderStyle&) const
{
    return child.isInline();
}

RenderRubyRun* RenderRubyBase::rubyRun() const
{
    ASSERT(parent());
    return downcast<RenderRubyRun>(parent());
}

std::optional<TextAlignMode> RenderRubyBase::overrideTextAlignmentForLine(bool /* endsWithSoftBreak */) const
{
    return TextAlignMode::Justify;
}

void RenderRubyBase::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
{
    if (rubyRun()->hasOverridingLogicalWidth() && firstRootBox() && !firstRootBox()->nextRootBox()) {
        logicalLeft += m_initialOffset;
        logicalWidth -= 2 * m_initialOffset;
        return;
    }

    LayoutUnit maxPreferredLogicalWidth = rubyRun() && rubyRun()->hasOverridingLogicalWidth() ? rubyRun()->overridingLogicalWidth() : this->maxPreferredLogicalWidth();
    if (maxPreferredLogicalWidth >= logicalWidth)
        return;

    // Inset the ruby base by half the inter-ideograph expansion amount.
    float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);

    logicalLeft += inset / 2;
    logicalWidth -= inset;
}

void RenderRubyBase::cachePriorCharactersIfNeeded(const LazyLineBreakIterator& lineBreakIterator)
{
    auto* run = rubyRun();
    if (run)
        run->setCachedPriorCharacters(lineBreakIterator.lastCharacter(), lineBreakIterator.secondToLastCharacter());
}

bool RenderRubyBase::isEmptyOrHasInFlowContent() const
{
    auto* firstChild = this->firstChild();
    if (!firstChild || !is<RenderElement>(*firstChild))
        return true;

    if (firstChild->isOutOfFlowPositioned())
        return false;

    for (auto& child : childrenOfType<RenderObject>(*downcast<RenderElement>(firstChild))) {
        if (!child.isOutOfFlowPositioned())
            return true;
    }
    return false;
}

} // namespace WebCore