C++ RenderObject::addChild方法代码示例

void RenderTableRow::addChild(RenderObject* child, RenderObject* beforeChild)
{
    // Make sure we don't append things after :after-generated content if we have it.
    if (!beforeChild)
        beforeChild = findAfterContentRenderer();

    if (!child->isTableCell()) {
        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous() && last->isTableCell() && !last->isBeforeOrAfterContent()) {
            if (beforeChild == last)
                beforeChild = last->firstChild();
            last->addChild(child, beforeChild);
            return;
        }

        if (beforeChild && !beforeChild->isAnonymous() && beforeChild->parent() == this) {
            RenderObject* cell = beforeChild->previousSibling();
            if (cell && cell->isTableCell()) {
                ASSERT(cell->isAnonymous());
                cell->addChild(child);
                return;
            }
        }

        // If beforeChild is inside an anonymous cell, insert into the cell.
        if (last && !last->isTableCell() && last->parent() && last->parent()->isAnonymous() && !last->parent()->isBeforeOrAfterContent()) {
            last->parent()->addChild(child, beforeChild);
            return;
        }

        RenderTableCell* cell = new (renderArena()) RenderTableCell(document() /* anonymous object */);
        RefPtr<RenderStyle> newStyle = RenderStyle::create();
        newStyle->inheritFrom(style());
        newStyle->setDisplay(TABLE_CELL);
        cell->setStyle(newStyle.release());
        addChild(cell, beforeChild);
        cell->addChild(child);
        return;
    } 
    
    // If the next renderer is actually wrapped in an anonymous table cell, we need to go up and find that.
    while (beforeChild && beforeChild->parent() != this)
        beforeChild = beforeChild->parent();

    RenderTableCell* cell = toRenderTableCell(child);

    // Generated content can result in us having a null section so make sure to null check our parent.
    if (parent())
        section()->addCell(cell, this);

    ASSERT(!beforeChild || beforeChild->isTableCell());
    RenderBox::addChild(cell, beforeChild);

    if (beforeChild || nextSibling())
        section()->setNeedsCellRecalc();
}

void RenderTableRow::addChild(RenderObject* child, RenderObject* beforeChild)
{
    // Make sure we don't append things after :after-generated content if we have it.
    if (!beforeChild)
        beforeChild = afterPseudoElementRenderer();

    if (!child->isTableCell()) {
        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous() && last->isTableCell() && !last->isBeforeOrAfterContent()) {
            if (beforeChild == last)
                beforeChild = last->firstChild();
            last->addChild(child, beforeChild);
            return;
        }

        if (beforeChild && !beforeChild->isAnonymous() && beforeChild->parent() == this) {
            RenderObject* cell = beforeChild->previousSibling();
            if (cell && cell->isTableCell() && cell->isAnonymous()) {
                cell->addChild(child);
                return;
            }
        }

        // If beforeChild is inside an anonymous cell, insert into the cell.
        if (last && !last->isTableCell() && last->parent() && last->parent()->isAnonymous() && !last->parent()->isBeforeOrAfterContent()) {
            last->parent()->addChild(child, beforeChild);
            return;
        }

        RenderTableCell* cell = RenderTableCell::createAnonymousWithParentRenderer(this);
        addChild(cell, beforeChild);
        cell->addChild(child);
        return;
    } 
    
    // If the next renderer is actually wrapped in an anonymous table cell, we need to go up and find that.
    while (beforeChild && beforeChild->parent() != this)
        beforeChild = beforeChild->parent();

    RenderTableCell* cell = toRenderTableCell(child);

    // Generated content can result in us having a null section so make sure to null check our parent.
    if (parent())
        section()->addCell(cell, this);

    ASSERT(!beforeChild || beforeChild->isTableCell());
    RenderBox::addChild(cell, beforeChild);

    if (beforeChild || nextSibling())
        section()->setNeedsCellRecalc();
}

static void createRendererIfNeeded(Element& element, RenderStyle* resolvedStyle)
{
    ASSERT(!element.renderer());

    Document& document = element.document();
    ContainerNode* renderingParentNode = NodeRenderingTraversal::parent(&element);

    RefPtr<RenderStyle> style = resolvedStyle;

    element.setIsInsideRegion(false);

    if (!shouldCreateRenderer(element, renderingParentNode) && !elementInsideRegionNeedsRenderer(element, renderingParentNode, style))
        return;

    if (!style)
        style = element.styleForRenderer();

    RenderNamedFlowThread* parentFlowRenderer = 0;
#if ENABLE(CSS_REGIONS)
    parentFlowRenderer = moveToFlowThreadIfNeeded(element, *style);
#endif

    if (!element.rendererIsNeeded(*style))
        return;

    RenderObject* parentRenderer;
    RenderObject* nextRenderer;
    if (parentFlowRenderer) {
        parentRenderer = parentFlowRenderer;
        nextRenderer = parentFlowRenderer->nextRendererForNode(&element);
    } else {
        parentRenderer = renderingParentNode->renderer();
        nextRenderer = nextSiblingRenderer(element, renderingParentNode);
    }

    RenderObject* newRenderer = element.createRenderer(document.renderArena(), style.get());
    if (!newRenderer)
        return;
    if (!parentRenderer->isChildAllowed(newRenderer, style.get())) {
        newRenderer->destroy();
        return;
    }

    // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
    // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
    newRenderer->setFlowThreadState(parentRenderer->flowThreadState());

    element.setRenderer(newRenderer);
    newRenderer->setAnimatableStyle(style.release()); // setAnimatableStyle() can depend on renderer() already being set.

#if ENABLE(FULLSCREEN_API)
    if (document.webkitIsFullScreen() && document.webkitCurrentFullScreenElement() == &element) {
        newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, &document);
        if (!newRenderer)
            return;
    }
#endif
    // Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer.
    parentRenderer->addChild(newRenderer, nextRenderer);
}

void RenderListItem::updateMarkerLocation()
{
    // Sanity check the location of our marker.
    if (m_marker) {
        RenderObject* markerPar = m_marker->parent();
        RenderObject* lineBoxParent = getParentOfFirstLineBox(this, m_marker);
        if (!lineBoxParent) {
            // If the marker is currently contained inside an anonymous box,
            // then we are the only item in that anonymous box (since no line box
            // parent was found).  It's ok to just leave the marker where it is
            // in this case.
            if (markerPar && markerPar->isAnonymousBlock())
                lineBoxParent = markerPar;
            else
                lineBoxParent = this;
        }
        
        if (markerPar != lineBoxParent || !m_marker->minMaxKnown()) {
            m_marker->remove();
            if (!lineBoxParent)
                lineBoxParent = this;
            lineBoxParent->addChild(m_marker, lineBoxParent->firstChild());
            if (!m_marker->minMaxKnown())
                m_marker->calcMinMaxWidth();
            recalcMinMaxWidths();
        }
    }
}

void RenderTreeBuilder::createRendererForTextIfNeeded()
{
    ASSERT(!m_node->renderer());

    // If we're out of composition then we can't render since there's no parent to inherit from.
    if (!m_renderingParent)
        return;

    if (!shouldCreateRenderer())
        return;

    Text* textNode = toText(m_node);
    RenderObject* parentRenderer = this->parentRenderer();

    m_style = parentRenderer->style();

    if (!textNode->textRendererIsNeeded(*m_style, *parentRenderer))
        return;

    RenderText* newRenderer = textNode->createTextRenderer(m_style.get());
    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
        newRenderer->destroy();
        return;
    }

    // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
    // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
    newRenderer->setFlowThreadState(parentRenderer->flowThreadState());

    RenderObject* nextRenderer = this->nextRenderer();
    textNode->setRenderer(newRenderer);
    // Parent takes care of the animations, no need to call setAnimatableStyle.
    newRenderer->setStyle(m_style.release());
    parentRenderer->addChild(newRenderer, nextRenderer);
}

void RenderListItem::updateMarkerLocation()
{
    // Sanity check the location of our marker.
    if (m_marker) {
        RenderObject* markerPar = m_marker->parent();
        RenderObject* lineBoxParent = getParentOfFirstLineBox(this, m_marker);
        if (!lineBoxParent) {
            // If the marker is currently contained inside an anonymous box,
            // then we are the only item in that anonymous box (since no line box
            // parent was found).  It's ok to just leave the marker where it is
            // in this case.
            if (markerPar && markerPar->isAnonymousBlock())
                lineBoxParent = markerPar;
            else
                lineBoxParent = this;
        }

        if (markerPar != lineBoxParent || m_marker->preferredLogicalWidthsDirty()) {
            // Removing and adding the marker can trigger repainting in
            // containers other than ourselves, so we need to disable LayoutState.
            view()->disableLayoutState();
            updateFirstLetter();
            m_marker->remove();
            if (!lineBoxParent)
                lineBoxParent = this;
            lineBoxParent->addChild(m_marker, firstNonMarkerChild(lineBoxParent));
            if (m_marker->preferredLogicalWidthsDirty())
                m_marker->computePreferredLogicalWidths();
            view()->enableLayoutState();
        }
    }
}

void NodeRenderingContext::createRendererForTextIfNeeded()
{
    ASSERT(!m_node->renderer());

    Text* textNode = toText(m_node);

    if (!shouldCreateRenderer())
        return;

    RenderObject* parentRenderer = this->parentRenderer();

    if (m_parentDetails.resetStyleInheritance())
        m_style = textNode->document()->styleResolver()->defaultStyleForElement();
    else
        m_style = parentRenderer->style();

    if (!textNode->textRendererIsNeeded(*this))
        return;

    RenderText* newRenderer = textNode->createTextRenderer(m_style.get());
    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
        newRenderer->destroy();
        return;
    }

    // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
    // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
    newRenderer->setFlowThreadState(parentRenderer->flowThreadState());

    RenderObject* nextRenderer = this->nextRenderer();
    textNode->setRenderer(newRenderer);
    // Parent takes care of the animations, no need to call setAnimatableStyle.
    newRenderer->setStyle(m_style.release());
    parentRenderer->addChild(newRenderer, nextRenderer);
}

void PseudoElement::attach(const AttachContext& context)
{
    ASSERT(!renderer());

    Element::attach(context);

    RenderObject* renderer = this->renderer();
    if (!renderer)
        return;
    RenderStyle* style = renderer->style();
    if (style->hasFlowFrom())
        return;
    if (style->styleType() != BEFORE && style->styleType() != AFTER)
        return;
    ASSERT(style->contentData());

    for (const ContentData* content = style->contentData(); content; content = content->next()) {
        RenderObject* child = content->createRenderer(document(), style);
        if (renderer->isChildAllowed(child, style)) {
            renderer->addChild(child);
            if (child->isQuote())
                toRenderQuote(child)->attachQuote();
        } else
            child->destroy();
    }
}

bool RenderListItem::updateMarkerLocation()
{
    ASSERT(m_marker);
    RenderObject* markerParent = m_marker->parent();
    RenderObject* lineBoxParent = getParentOfFirstLineBox(this, m_marker);
    if (!lineBoxParent) {
        // If the marker is currently contained inside an anonymous box, then we
        // are the only item in that anonymous box (since no line box parent was
        // found). It's ok to just leave the marker where it is in this case.
        if (markerParent && markerParent->isAnonymousBlock())
            lineBoxParent = markerParent;
        else
            lineBoxParent = this;
    }

    if (markerParent != lineBoxParent) {
        m_marker->remove();
        lineBoxParent->addChild(m_marker, firstNonMarkerChild(lineBoxParent));
        m_marker->updateMarginsAndContent();
        // If markerParent is an anonymous block with no children, destroy it.
        if (markerParent && markerParent->isAnonymousBlock() && !toRenderBlock(markerParent)->firstChild() && !toRenderBlock(markerParent)->continuation())
            markerParent->destroy();
        return true;
    }

    return false;
}

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);
    }
}

void TextImpl::attach(KHTMLView *w)
{
    RenderObject *r = _parent->renderer();
    if(r && style())
    {
	m_render = new RenderText(str);
	m_render->setStyle(style());
	r->addChild(m_render, _next ? _next->renderer() : 0);
    }
    CharacterDataImpl::attach(w);
}

void NodeRenderingContext::createRendererForElementIfNeeded()
{
    ASSERT(!m_node->renderer());

    Element* element = toElement(m_node);

    if (!shouldCreateRenderer())
        return;
    m_style = element->styleForRenderer();
    ASSERT(m_style);

    moveToFlowThreadIfNeeded();

    if (!element->rendererIsNeeded(*this))
        return;

    RenderObject* parentRenderer = this->parentRenderer();
    RenderObject* nextRenderer = this->nextRenderer();
    
#if ENABLE(DIALOG_ELEMENT)
    if (element->isInTopLayer())
        adjustInsertionPointForTopLayerElement(element, parentRenderer, nextRenderer);
#endif

    Document* document = element->document();
    RenderObject* newRenderer = element->createRenderer(document->renderArena(), m_style.get());
    if (!newRenderer)
        return;
    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
        newRenderer->destroy();
        return;
    }

    // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
    // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
    newRenderer->setInRenderFlowThread(parentRenderer->inRenderFlowThread());

    element->setRenderer(newRenderer);
    newRenderer->setAnimatableStyle(m_style.release()); // setAnimatableStyle() can depend on renderer() already being set.

#if ENABLE(FULLSCREEN_API)
    if (document->webkitIsFullScreen() && document->webkitCurrentFullScreenElement() == element) {
        newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, document);
        if (!newRenderer)
            return;
    }
#endif
    // Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer.
    parentRenderer->addChild(newRenderer, nextRenderer);
}

void NodeRenderingContext::createRendererForElementIfNeeded()
{
    ASSERT(!m_node->renderer());

    Element* element = toElement(m_node);

    element->setIsInsideRegion(false);

    if (!shouldCreateRenderer() && !elementInsideRegionNeedsRenderer())
        return;

    if (!m_style)
        m_style = element->styleForRenderer();
    ASSERT(m_style);

    moveToFlowThreadIfNeeded();

    if (!element->rendererIsNeeded(*this))
        return;

    RenderObject* newRenderer = element->createRenderer(m_style.get());
    if (!newRenderer)
        return;

    RenderObject* parentRenderer = this->parentRenderer();

    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
        newRenderer->destroy();
        return;
    }

    // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
    // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
    newRenderer->setFlowThreadState(parentRenderer->flowThreadState());

    RenderObject* nextRenderer = this->nextRenderer();
    element->setRenderer(newRenderer);
    newRenderer->setAnimatableStyle(m_style.release()); // setAnimatableStyle() can depend on renderer() already being set.

    if (FullscreenElementStack::isActiveFullScreenElement(element)) {
        newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, element->document());
        if (!newRenderer)
            return;
    }

    // Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer.
    parentRenderer->addChild(newRenderer, nextRenderer);
}

void HTMLTextFormControlElement::fixPlaceholderRenderer(HTMLElement* placeholder, HTMLElement* siblingElement)
{
    // FIXME: We should change the order of DOM nodes. But it makes an assertion
    // failure in editing code.
    if (!placeholder || !placeholder->renderer())
        return;
    RenderObject* placeholderRenderer = placeholder->renderer();
    RenderObject* siblingRenderer = siblingElement->renderer();
    ASSERT(siblingRenderer);
    if (placeholderRenderer->nextSibling() == siblingRenderer)
        return;
    RenderObject* parentRenderer = placeholderRenderer->parent();
    ASSERT(parentRenderer == siblingRenderer->parent());
    parentRenderer->removeChild(placeholderRenderer);
    parentRenderer->addChild(placeholderRenderer, siblingRenderer);
}

void RenderTableRow::addChild(RenderObject* child, RenderObject* beforeChild)
{
    bool isTableRow = element() && element()->hasTagName(trTag);
    
    if (!child->isTableCell()) {
        if (isTableRow && child->element() && child->element()->hasTagName(formTag) && document()->isHTMLDocument()) {
            RenderContainer::addChild(child, beforeChild);
            return;
        }

        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous() && last->isTableCell()) {
            last->addChild(child);
            return;
        }

        // If beforeChild is inside an anonymous cell, insert into the cell.
        if (last && !last->isTableCell() && last->parent() && last->parent()->isAnonymous()) {
            last->parent()->addChild(child, beforeChild);
            return;
        }

        RenderTableCell* cell = new (renderArena()) RenderTableCell(document() /* anonymous object */);
        RenderStyle* newStyle = new (renderArena()) RenderStyle();
        newStyle->inheritFrom(style());
        newStyle->setDisplay(TABLE_CELL);
        cell->setStyle(newStyle);
        addChild(cell, beforeChild);
        cell->addChild(child);
        return;
    } 
    
    // If the next renderer is actually wrapped in an anonymous table cell, we need to go up and find that.
    while (beforeChild && !beforeChild->isTableCell())
        beforeChild = beforeChild->parent();

    RenderTableCell* cell = static_cast<RenderTableCell*>(child);

    section()->addCell(cell, this);

    RenderContainer::addChild(cell, beforeChild);

    if (beforeChild || nextSibling())
        section()->setNeedsCellRecalc();
}