C++ RenderRubyBase类代码示例

static bool shouldOverhang(bool firstLine, const RenderObject* renderer, const RenderRubyBase& rubyBase)
{
    if (!renderer || !renderer->isText())
        return false;
    const RenderStyle& rubyBaseStyle = firstLine ? rubyBase.firstLineStyle() : rubyBase.style();
    const RenderStyle& style = firstLine ? renderer->firstLineStyle() : renderer->style();
    return style.fontSize() <= rubyBaseStyle.fontSize();
}

RenderRubyBase* RenderRubyRun::createRubyBase() const
{
    RenderRubyBase* renderer = RenderRubyBase::createAnonymous(&document());
    RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK);
    newStyle->setTextAlign(CENTER); // FIXME: use WEBKIT_CENTER?
    renderer->setStyle(newStyle.release());
    return renderer;
}

RenderRubyBase* RenderRubyRun::createRubyBase() const
{
    RenderRubyBase* rb = new (renderArena()) RenderRubyBase(document() /* anonymous */);
    RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK);
    newStyle->setTextAlign(CENTER); // FIXME: use WEBKIT_CENTER?
    rb->setStyle(newStyle.release());
    return rb;
}

void RenderRubyRun::addChild(RenderObject* child, RenderObject* beforeChild)
{
    ASSERT(child);

    if (child->isRubyText()) {
        if (!beforeChild) {
            // RenderRuby has already ascertained that we can add the child here.
            ASSERT(!hasRubyText());
            // prepend ruby texts as first child
            RenderBlockFlow::addChild(child, firstChild());
        }  else if (beforeChild->isRubyText()) {
            // New text is inserted just before another.
            // In this case the new text takes the place of the old one, and
            // the old text goes into a new run that is inserted as next sibling.
            ASSERT(beforeChild->parent() == this);
            RenderObject* ruby = parent();
            ASSERT(ruby->isRuby());
            RenderBlock* newRun = staticCreateRubyRun(ruby);
            ruby->addChild(newRun, nextSibling());
            // Add the new ruby text and move the old one to the new run
            // Note: Doing it in this order and not using RenderRubyRun's methods,
            // in order to avoid automatic removal of the ruby run in case there is no
            // other child besides the old ruby text.
            RenderBlockFlow::addChild(child, beforeChild);
            RenderBlockFlow::removeChild(beforeChild);
            newRun->addChild(beforeChild);
        } else if (hasRubyBase()) {
            // Insertion before a ruby base object.
            // In this case we need insert a new run before the current one and split the base.
            RenderObject* ruby = parent();
            RenderRubyRun* newRun = staticCreateRubyRun(ruby);
            ruby->addChild(newRun, this);
            newRun->addChild(child);
            rubyBaseSafe()->moveChildren(newRun->rubyBaseSafe(), beforeChild);
        }
    } else {
        // child is not a text -> insert it into the base
        // (append it instead if beforeChild is the ruby text)
        RenderRubyBase* base = rubyBaseSafe();
        if (beforeChild == base)
            beforeChild = base->firstChild();
        if (beforeChild && beforeChild->isRubyText())
            beforeChild = 0;
        ASSERT(!beforeChild || beforeChild->isDescendantOf(base));
        base->addChild(child, beforeChild);
    }
}

RenderObject* RenderRubyRun::removeChild(RenderObject& child)
{
    // If the child is a ruby text, then merge the ruby base with the base of
    // the right sibling run, if possible.
    if (!beingDestroyed() && !documentBeingDestroyed() && child.isRubyText()) {
        RenderRubyBase* base = rubyBase();
        RenderObject* rightNeighbour = nextSibling();
        if (base && rightNeighbour && rightNeighbour->isRubyRun()) {
            // Ruby run without a base can happen only at the first run.
            RenderRubyRun* rightRun = toRenderRubyRun(rightNeighbour);
            if (rightRun->hasRubyBase()) {
                RenderRubyBase* rightBase = rightRun->rubyBaseSafe();
                // Collect all children in a single base, then swap the bases.
                rightBase->mergeChildrenWithBase(base);
                moveChildTo(rightRun, base);
                rightRun->moveChildTo(this, rightBase);
                // The now empty ruby base will be removed below.
                ASSERT(!rubyBase()->firstChild());
            }
        }
    }

    RenderObject* next = RenderBlockFlow::removeChild(child);

    if (!beingDestroyed() && !documentBeingDestroyed()) {
        // Check if our base (if any) is now empty. If so, destroy it.
        RenderBlock* base = rubyBase();
        if (base && !base->firstChild()) {
            next = RenderBlockFlow::removeChild(*base);
            base->deleteLines();
            base->destroy();
        }

        // If any of the above leaves the run empty, destroy it as well.
        if (isEmpty()) {
            parent()->removeChild(*this);
            deleteLines();
            destroy();
            next = nullptr;
        }
    }
    
    return next;
}

void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
    ASSERT(!needsLayout());

    startOverhang = 0;
    endOverhang = 0;

    RenderRubyBase* rubyBase = this->rubyBase();
    RenderRubyText* rubyText = this->rubyText();

    if (!rubyBase || !rubyText)
        return;

    if (!rubyBase->firstRootBox())
        return;

    int logicalWidth = this->logicalWidth();
    int logicalLeftOverhang = numeric_limits<int>::max();
    int logicalRightOverhang = numeric_limits<int>::max();
    for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
        logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
        logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
    }

    startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
    endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;

    if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        startOverhang = 0;

    if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        endOverhang = 0;

    // We overhang a ruby only if the neighboring render object is a text.
    // We can overhang the ruby by no more than half the width of the neighboring text
    // and no more than half the font size.
    int halfWidthOfFontSize = rubyText->style(firstLine)->fontSize() / 2;
    if (startOverhang)
        startOverhang = min<int>(startOverhang, min<int>(toRenderText(startRenderer)->minLogicalWidth(), halfWidthOfFontSize));
    if (endOverhang)
        endOverhang = min<int>(endOverhang, min<int>(toRenderText(endRenderer)->minLogicalWidth(), halfWidthOfFontSize));
}

void RenderRubyRun::removeChild(RenderObject* child)
{
    // If the child is a ruby text, then merge the ruby base with the base of
    // the right sibling run, if possible.
    if (!m_beingDestroyed && !documentBeingDestroyed() && child->isRubyText()) {
        RenderRubyBase* base = rubyBase();
        RenderObject* rightNeighbour = nextSibling();
        if (base && rightNeighbour && rightNeighbour->isRubyRun()) {
            // Ruby run without a base can happen only at the first run.
            RenderRubyRun* rightRun = static_cast<RenderRubyRun*>(rightNeighbour);
            if (rightRun->hasRubyBase()) {
                RenderRubyBase* rightBase = rightRun->rubyBaseSafe();
                // Collect all children in a single base, then swap the bases.
                rightBase->moveChildren(base);
                moveChildTo(rightRun, base);
                rightRun->moveChildTo(this, rightBase);
                // The now empty ruby base will be removed below.
            }
        }
    }

    RenderBlock::removeChild(child);

    if (!m_beingDestroyed && !documentBeingDestroyed()) {
        // Check if our base (if any) is now empty. If so, destroy it.
        RenderBlock* base = rubyBase();
        if (base && !base->firstChild()) {
            RenderBlock::removeChild(base);
            base->deleteLineBoxTree();
            base->destroy();
        }

        // If any of the above leaves the run empty, destroy it as well.
        if (isEmpty()) {
            parent()->removeChild(this);
            deleteLineBoxTree();
            destroy();
        }
    }
}

void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
    ASSERT(!needsLayout());

    startOverhang = 0;
    endOverhang = 0;

    RenderRubyBase* rubyBase = this->rubyBase();
    RenderRubyText* rubyText = this->rubyText();

    if (!rubyBase || !rubyText)
        return;

    if (!rubyBase->firstRootBox())
        return;

    int logicalWidth = this->logicalWidth();

    // No more than half a ruby is allowed to overhang.
    int logicalLeftOverhang = rubyText->style(firstLine)->fontSize() / 2;
    int logicalRightOverhang = logicalLeftOverhang;

    for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
        logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
        logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
    }

    startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
    endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;

    if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        startOverhang = 0;

    if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
        endOverhang = 0;
}

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