xref: /external/chromium_org/third_party/WebKit/Source/core/rendering/RenderRubyBase.cpp

/*
 * Copyright (C) 2009 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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,
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#include "config.h"

#include "core/rendering/RenderRubyBase.h"
#include "core/rendering/RenderRubyRun.h"

namespace blink {

RenderRubyBase::RenderRubyBase()
    : RenderBlockFlow(0)
{
    setInline(false);
}

RenderRubyBase::~RenderRubyBase()
{
}

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

bool RenderRubyBase::isChildAllowed(RenderObject* child, RenderStyle*) const
{
    return child->isInline();
}

void RenderRubyBase::moveChildren(RenderRubyBase* toBase, RenderObject* 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();
    toBase->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
}

void RenderRubyBase::moveInlineChildren(RenderRubyBase* toBase, RenderObject* beforeChild)
{
    ASSERT(childrenInline());
    ASSERT_ARG(toBase, toBase);

    if (!firstChild())
        return;

    RenderBlock* 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.
        RenderObject* lastChild = toBase->lastChild();
        if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline())
            toBlock = toRenderBlock(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 RenderRubyBase::moveBlockChildren(RenderRubyBase* toBase, RenderObject* 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.
    RenderObject* firstChildHere = firstChild();
    RenderObject* lastChildThere = toBase->lastChild();
    if (firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline()
            && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) {
        RenderBlock* anonBlockHere = toRenderBlock(firstChildHere);
        RenderBlock* anonBlockThere = toRenderBlock(lastChildThere);
        anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
        anonBlockHere->deleteLineBoxTree();
        anonBlockHere->destroy();
    }
    // Move all remaining children normally.
    moveChildrenTo(toBase, firstChild(), beforeChild);
}

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

void RenderRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
{
    int maxPreferredLogicalWidth = 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;
}

} // namespace blink