Source/core/layout/LayoutRubyBase.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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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"

#include "core/layout/LayoutRubyBase.h"

#include "core/layout/LayoutRubyRun.h"

namespace blink {

LayoutRubyBase::LayoutRubyBase()
    : LayoutBlockFlow(nullptr)
{
    setInline(false);
}

LayoutRubyBase::~LayoutRubyBase()
{
}

LayoutRubyBase* LayoutRubyBase::createAnonymous(Document* document)
{
    LayoutRubyBase* layoutObject = new LayoutRubyBase();
    layoutObject->setDocumentForAnonymous(document);
    return layoutObject;
}

bool LayoutRubyBase::isChildAllowed(LayoutObject* child, const ComputedStyle&) const
{
    return child->isInline();
}

void LayoutRubyBase::moveChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
{
    // This function removes all children that are before (!) beforeChild
    // and appends them to toBase.
    ASSERT_ARG(toBase, toBase);

    if (beforeChild && beforeChild->parent() != this)
        beforeChild = splitAnonymousBoxesAroundChild(beforeChild);

    if (childrenInline())
        moveInlineChildren(toBase, beforeChild);
    else
        moveBlockChildren(toBase, beforeChild);

    setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Unknown);
    toBase->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Unknown);
}

void LayoutRubyBase::moveInlineChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
{
    ASSERT(childrenInline());
    ASSERT_ARG(toBase, toBase);

    if (!firstChild())
        return;

    LayoutBlock* toBlock;
    if (toBase->childrenInline()) {
        // The standard and easy case: move the children into the target base
        toBlock = toBase;
    } else {
        // We need to wrap the inline objects into an anonymous block.
        // If toBase has a suitable block, we re-use it, otherwise create a new one.
        LayoutObject* lastChild = toBase->lastChild();
        if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline()) {
            toBlock = toLayoutBlock(lastChild);
        } else {
            toBlock = toBase->createAnonymousBlock();
            toBase->children()->appendChildNode(toBase, toBlock);
        }
    }
    // Move our inline children into the target block we determined above.
    moveChildrenTo(toBlock, firstChild(), beforeChild);
}

void LayoutRubyBase::moveBlockChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
{
    ASSERT(!childrenInline());
    ASSERT_ARG(toBase, toBase);

    if (!firstChild())
        return;

    if (toBase->childrenInline())
        toBase->makeChildrenNonInline();

    // If an anonymous block would be put next to another such block, then merge those.
    LayoutObject* firstChildHere = firstChild();
    LayoutObject* lastChildThere = toBase->lastChild();
    if (firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline()
        && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) {
        LayoutBlock* anonBlockHere = toLayoutBlock(firstChildHere);
        LayoutBlock* anonBlockThere = toLayoutBlock(lastChildThere);
        anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
        anonBlockHere->deleteLineBoxTree();
        anonBlockHere->destroy();
    }
    // Move all remaining children normally.
    moveChildrenTo(toBase, firstChild(), beforeChild);
}

ETextAlign LayoutRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
{
    return JUSTIFY;
}

void LayoutRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, LayoutUnit& logicalLeft, LayoutUnit& logicalWidth) const
{
    int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
    if (maxPreferredLogicalWidth >= logicalWidth)
        return;

    unsigned maxCount = static_cast<unsigned>(LayoutUnit::max().floor());
    if (expansionOpportunityCount > maxCount)
        expansionOpportunityCount = maxCount;

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

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

} // namespace blink