C++ RenderObject::destroy方法代码示例

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.
            LayoutStateDisabler layoutStateDisabler(view());
            updateFirstLetter();
            m_marker->remove();
            if (!lineBoxParent)
                lineBoxParent = this;
            lineBoxParent->addChild(m_marker, firstNonMarkerChild(lineBoxParent));
            m_marker->updateMarginsAndContent();
            // If markerPar is an anonymous block that has lost all its children, destroy it.
            if (markerPar && markerPar->isAnonymousBlock() && !markerPar->firstChild() && !toRenderBlock(markerPar)->continuation())
                markerPar->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 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();
    }
}

static RenderObject* ensureBeforeAfterContainer(RenderObject* owner, PseudoId type, RenderStyle* pseudoElementStyle, Node* generatingNode, RenderObject* insertBefore)
{
    // Make a generated box that might be any display type now that we are able to drill down into children
    // to find the original content properly.
    RenderObject* generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
    ASSERT(generatingNode); // The styled object cannot be anonymous or else it could not have ':before' or ':after' pseudo elements.
    generatedContentContainer->setNode(generatingNode); // This allows access to the generatingNode.
    generatedContentContainer->setStyle(pseudoElementStyle);
    if (!owner->isChildAllowed(generatedContentContainer, pseudoElementStyle)) {
        // The generated content container is not allowed here -> abort.
        generatedContentContainer->destroy();
        return 0;
    }

    // When we don't have a first child and are part of a continuation chain,
    // insertBefore is incorrectly set to zero above, which causes the :before
    // child to end up at the end of continuation chain.
    // See https://bugs.webkit.org/show_bug.cgi?id=78380.
    if (!insertBefore && type == BEFORE && owner->virtualContinuation())
        owner->addChildIgnoringContinuation(generatedContentContainer, 0);
    else
        owner->addChild(generatedContentContainer, insertBefore);

    return generatedContentContainer;
}

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);
}

TEST_F(RenderPartTest, DestroyUpdatesImageQualityController)
{
    RefPtrWillBeRawPtr<Element> element = HTMLElement::create(HTMLNames::divTag, document());
    RenderObject* part = new RenderPart(element.get());
    // The third and forth arguments are not important in this test.
    ImageQualityController::imageQualityController()->set(part, 0, this, LayoutSize(1, 1));
    EXPECT_TRUE(ImageQualityController::has(part));
    part->destroy();
    EXPECT_FALSE(ImageQualityController::has(part));
}

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);
}

RenderObject* NodeRendererFactory::createRenderer()
{
    Node* node = m_context.node();
    RenderObject* newRenderer = node->createRenderer(node->document()->renderArena(), m_context.style());
    if (!newRenderer)
        return 0;

    if (!m_context.parentRenderer()->isChildAllowed(newRenderer, m_context.style())) {
        newRenderer->destroy();
        return 0;
    }

    node->setRenderer(newRenderer);
    newRenderer->setAnimatableStyle(m_context.releaseStyle()); // setAnimatableStyle() can depend on renderer() already being set.
    return newRenderer;
}

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

    if (!shouldCreateRenderer())
        return;
    Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
    
    m_style = element ? element->styleForRenderer() : parentRenderer()->style();
    ASSERT(m_style);

    moveToFlowThreadIfNeeded();

    if (!m_node->rendererIsNeeded(*this)) {
        if (element && m_style->affectedByEmpty())
            element->setStyleAffectedByEmpty();
        return;
    }
    RenderObject* parentRenderer = this->parentRenderer();
    RenderObject* nextRenderer = this->nextRenderer();

#if ENABLE(DIALOG_ELEMENT)
    if (element && element->isInTopLayer())
        adjustInsertionPointForTopLayerElement(element, parentRenderer, nextRenderer);
#endif

    Document* document = m_node->document();
    RenderObject* newRenderer = m_node->createRenderer(document->renderArena(), m_style.get());
    if (!newRenderer)
        return;
    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
        newRenderer->destroy();
        return;
    }
    m_node->setRenderer(newRenderer);
    newRenderer->setAnimatableStyle(m_style.release()); // setAnimatableStyle() can depend on renderer() already being set.

#if ENABLE(FULLSCREEN_API)
    if (document->webkitIsFullScreen() && document->webkitCurrentFullScreenElement() == m_node) {
        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 RenderTreeBuilder::createRendererForElementIfNeeded()
{
    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;

    Element* element = toElement(m_node);

    if (!shouldCreateRenderer())
        return;

    RenderStyle& style = this->style();

    if (!element->rendererIsNeeded(style))
        return;

    RenderObject* newRenderer = element->createRenderer(&style);
    if (!newRenderer)
        return;

    RenderObject* parentRenderer = this->parentRenderer();

    if (!parentRenderer->isChildAllowed(newRenderer, &style)) {
        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->setStyle(&style); // setStyle() 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 PseudoElement::didAttachRenderers()
{
    RenderObject* renderer = this->renderer();
    if (!renderer || !renderer->style()->regionThread().isEmpty())
        return;

    RenderStyle* style = renderer->style();
    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();
    }
}

void RenderObjectChildList::updateBeforeAfterContent(RenderObject* owner, PseudoId type, const RenderObject* styledObject)
{
    // Double check that the document did in fact use generated content rules.  Otherwise we should not have been called.
    ASSERT(owner->document()->usesBeforeAfterRules());

    // In CSS2, before/after pseudo-content cannot nest.  Check this first.
    if (owner->style()->styleType() == BEFORE || owner->style()->styleType() == AFTER)
        return;
    
    if (!styledObject)
        styledObject = owner;

    RenderStyle* pseudoElementStyle = styledObject->getCachedPseudoStyle(type);
    RenderObject* child;
    switch (type) {
    case BEFORE:
        child = beforePseudoElementRenderer(owner);
        break;
    case AFTER:
        child = afterPseudoElementRenderer(owner);
        break;
    default:
        ASSERT_NOT_REACHED();
        return;
    }

    // Whether or not we currently have generated content attached.
    bool oldContentPresent = child;

    // Whether or not we now want generated content.
    bool newContentWanted = pseudoElementStyle && pseudoElementStyle->display() != NONE;

    // For <q><p/></q>, if this object is the inline continuation of the <q>, we only want to generate
    // :after content and not :before content.
    if (newContentWanted && type == BEFORE && owner->isElementContinuation())
        newContentWanted = false;

    // Similarly, if we're the beginning of a <q>, and there's an inline continuation for our object,
    // then we don't generate the :after content.
    if (newContentWanted && type == AFTER && owner->virtualContinuation())
        newContentWanted = false;
    
    // If we don't want generated content any longer, or if we have generated content, but it's no longer
    // identical to the new content data we want to build render objects for, then we nuke all
    // of the old generated content.
    if (oldContentPresent && (!newContentWanted || Node::diff(child->style(), pseudoElementStyle, owner->document()) == Node::Detach)) {
        // Nuke the child. 
        if (child->style()->styleType() == type) {
            oldContentPresent = false;
            child->destroy();
            child = (type == BEFORE) ? owner->virtualChildren()->firstChild() : owner->virtualChildren()->lastChild();
        }
    }

    // If we have no pseudo-element style or if the pseudo-element style's display type is NONE, then we
    // have no generated content and can now return.
    if (!newContentWanted)
        return;

    if (owner->isRenderInline() && !pseudoElementStyle->isDisplayInlineType() && !pseudoElementStyle->isFloating() &&
        !(pseudoElementStyle->position() == AbsolutePosition || pseudoElementStyle->position() == FixedPosition))
        // According to the CSS2 spec (the end of section 12.1), the only allowed
        // display values for the pseudo style are NONE and INLINE for inline flows.
        // FIXME: CSS2.1 lifted this restriction, but block display types will crash.
        // For now we at least relax the restriction to allow all inline types like inline-block
        // and inline-table.
        pseudoElementStyle->setDisplay(INLINE);

    if (oldContentPresent) {
        updateBeforeAfterStyle(child, type, pseudoElementStyle);
        return; // We've updated the generated content. That's all we needed to do.
    }
    
    RenderObject* insertBefore = (type == BEFORE) ? owner->virtualChildren()->firstChild() : 0;
    if (insertBefore && insertBefore->isAnonymousBlock() && insertBefore->childrenInline() && !insertBefore->isEmpty()) {
        // We are going to add the "before" element. We have to check whether the "insertBefore" element
        // is an anonymous block with inline children. If it is, then we should insert the "before" element
        // before the first inline child of the anonymous block, otherwise we will end up with the "before"
        // element in a different block. We do this only when the anonymous block has children, otherwise
        // we end up with the before element in a wrong block.
        insertBefore = insertBefore->firstChild();
    }

    // Nothing goes before the intruded run-in, not even generated content.
    if (insertBefore && insertBefore->isRunIn() && owner->isRenderBlock()
        && toRenderBlock(owner)->runInIsPlacedIntoSiblingBlock(insertBefore))
        insertBefore = insertBefore->nextSibling();

    // Generated content consists of a single container that houses multiple children (specified
    // by the content property).  This generated content container gets the pseudo-element style set on it.
    RenderObject* generatedContentContainer = 0;

    // Walk our list of generated content and create render objects for each.
    for (const ContentData* content = pseudoElementStyle->contentData(); content; content = content->next()) {
        RenderObject* renderer =  createRendererForBeforeAfterContent(owner, content, pseudoElementStyle);

        if (renderer) {
            if (!generatedContentContainer) {
                // Make a generated box that might be any display type now that we are able to drill down into children
                // to find the original content properly.
//.........这里部分代码省略.........