C++ element函数代码示例

void ImageLoader::updateFromElement()
{
    // If we're not making renderers for the page, then don't load images.  We don't want to slow
    // down the raw HTML parsing case by loading images we don't intend to display.
    Document& document = element().document();
    if (!document.hasLivingRenderTree())
        return;

    AtomicString attr = element().imageSourceURL();

    if (attr == m_failedLoadURL)
        return;

    // Do not load any image if the 'src' attribute is missing or if it is
    // an empty string.
    CachedResourceHandle<CachedImage> newImage = 0;
    if (!attr.isNull() && !stripLeadingAndTrailingHTMLSpaces(attr).isEmpty()) {
        CachedResourceRequest request(ResourceRequest(document.completeURL(sourceURI(attr))));
        request.setInitiator(&element());

        String crossOriginMode = element().fastGetAttribute(HTMLNames::crossoriginAttr);
        if (!crossOriginMode.isNull()) {
            StoredCredentials allowCredentials = equalIgnoringCase(crossOriginMode, "use-credentials") ? AllowStoredCredentials : DoNotAllowStoredCredentials;
            updateRequestForAccessControl(request.mutableResourceRequest(), document.securityOrigin(), allowCredentials);
        }

        if (m_loadManually) {
            bool autoLoadOtherImages = document.cachedResourceLoader()->autoLoadImages();
            document.cachedResourceLoader()->setAutoLoadImages(false);
            newImage = new CachedImage(request.resourceRequest(), m_element.document().page()->sessionID());
            newImage->setLoading(true);
            newImage->setOwningCachedResourceLoader(document.cachedResourceLoader());
            document.cachedResourceLoader()->m_documentResources.set(newImage->url(), newImage.get());
            document.cachedResourceLoader()->setAutoLoadImages(autoLoadOtherImages);
        } else
            newImage = document.cachedResourceLoader()->requestImage(request);

        // If we do not have an image here, it means that a cross-site
        // violation occurred, or that the image was blocked via Content
        // Security Policy, or the page is being dismissed. Trigger an
        // error event if the page is not being dismissed.
        if (!newImage && !pageIsBeingDismissed(document)) {
            m_failedLoadURL = attr;
            m_hasPendingErrorEvent = true;
            errorEventSender().dispatchEventSoon(*this);
        } else
            clearFailedLoadURL();
    } else if (!attr.isNull()) {
        // Fire an error event if the url is empty.
        m_failedLoadURL = attr;
        m_hasPendingErrorEvent = true;
        errorEventSender().dispatchEventSoon(*this);
    }
    
    CachedImage* oldImage = m_image.get();
    if (newImage != oldImage) {
        if (m_hasPendingBeforeLoadEvent) {
            beforeLoadEventSender().cancelEvent(*this);
            m_hasPendingBeforeLoadEvent = false;
        }
        if (m_hasPendingLoadEvent) {
            loadEventSender().cancelEvent(*this);
            m_hasPendingLoadEvent = false;
        }

        // Cancel error events that belong to the previous load, which is now cancelled by changing the src attribute.
        // If newImage is null and m_hasPendingErrorEvent is true, we know the error event has been just posted by
        // this load and we should not cancel the event.
        // FIXME: If both previous load and this one got blocked with an error, we can receive one error event instead of two.
        if (m_hasPendingErrorEvent && newImage) {
            errorEventSender().cancelEvent(*this);
            m_hasPendingErrorEvent = false;
        }

        m_image = newImage;
        m_hasPendingBeforeLoadEvent = !document.isImageDocument() && newImage;
        m_hasPendingLoadEvent = newImage;
        m_imageComplete = !newImage;

        if (newImage) {
            if (!document.isImageDocument()) {
                if (!document.hasListenerType(Document::BEFORELOAD_LISTENER))
                    dispatchPendingBeforeLoadEvent();
                else
                    beforeLoadEventSender().dispatchEventSoon(*this);
            } else
                updateRenderer();

            // If newImage is cached, addClient() will result in the load event
            // being queued to fire. Ensure this happens after beforeload is
            // dispatched.
            newImage->addClient(this);
        }
        if (oldImage)
            oldImage->removeClient(this);
    }

    if (RenderImageResource* imageResource = renderImageResource())
        imageResource->resetAnimation();

//.........这里部分代码省略.........

void RenderSVGImage::paint(PaintInfo& paintInfo, int parentX, int parentY)
{
    if (paintInfo.context->paintingDisabled() || (paintInfo.phase != PaintPhaseForeground) || style()->visibility() == HIDDEN)
        return;
    
    paintInfo.context->save();
    paintInfo.context->concatCTM(AffineTransform().translate(parentX, parentY));
    paintInfo.context->concatCTM(localTransform());
    paintInfo.context->concatCTM(translationForAttributes());

    FloatRect boundingBox = FloatRect(0, 0, width(), height());

    SVGElement* svgElement = static_cast<SVGElement*>(element());
    ASSERT(svgElement && svgElement->document() && svgElement->isStyled());

    SVGStyledElement* styledElement = static_cast<SVGStyledElement*>(svgElement);
    const SVGRenderStyle* svgStyle = style()->svgStyle();

    AtomicString filterId(SVGURIReference::getTarget(svgStyle->filter()));
    AtomicString clipperId(SVGURIReference::getTarget(svgStyle->clipPath()));
    AtomicString maskerId(SVGURIReference::getTarget(svgStyle->maskElement()));

#if ENABLE(SVG_EXPERIMENTAL_FEATURES)
    SVGResourceFilter* filter = getFilterById(document(), filterId);
#endif
    SVGResourceClipper* clipper = getClipperById(document(), clipperId);
    SVGResourceMasker* masker = getMaskerById(document(), maskerId);

#if ENABLE(SVG_EXPERIMENTAL_FEATURES)
    if (filter)
        filter->prepareFilter(paintInfo.context, boundingBox);
    else if (!filterId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(filterId, styledElement);
#endif

    if (clipper) {
        clipper->addClient(styledElement);
        clipper->applyClip(paintInfo.context, boundingBox);
    } else if (!clipperId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(clipperId, styledElement);

    if (masker) {
        masker->addClient(styledElement);
        masker->applyMask(paintInfo.context, boundingBox);
    } else if (!maskerId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(maskerId, styledElement);

    float opacity = style()->opacity();
    if (opacity < 1.0f) {
        paintInfo.context->clip(enclosingIntRect(boundingBox));
        paintInfo.context->beginTransparencyLayer(opacity);
    }

    PaintInfo pi(paintInfo);
    pi.rect = absoluteTransform().inverse().mapRect(pi.rect);

    SVGImageElement* imageElt = static_cast<SVGImageElement*>(node());

    FloatRect destRect(m_x, m_y, contentWidth(), contentHeight());
    FloatRect srcRect(0, 0, image()->width(), image()->height());

    if (imageElt->preserveAspectRatio()->align() != SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_NONE)
        adjustRectsForAspectRatio(destRect, srcRect, imageElt->preserveAspectRatio());

    paintInfo.context->drawImage(image(), destRect, srcRect);

#if ENABLE(SVG_EXPERIMENTAL_FEATURES)
    if (filter)
        filter->applyFilter(paintInfo.context, boundingBox);
#endif

    if (opacity < 1.0f)
        paintInfo.context->endTransparencyLayer();

    paintInfo.context->restore();
}

void BaseChooserOnlyDateAndTimeInputType::accessKeyAction(bool sendMouseEvents)
{
    BaseDateAndTimeInputType::accessKeyAction(sendMouseEvents);
    BaseClickableWithKeyInputType::accessKeyAction(element(), sendMouseEvents);
}

bool ScriptLoader::ignoresLoadRequest() const
{
    return m_alreadyStarted || m_isExternalScript || m_parserInserted || !element() || !element()->inDocument();
}

FloatRect RenderPath::drawMarkersIfNeeded(GraphicsContext* context, const FloatRect&, const Path& path) const
{
    Document* doc = document();

    SVGElement* svgElement = static_cast<SVGElement*>(element());
    ASSERT(svgElement && svgElement->document() && svgElement->isStyled());

    SVGStyledElement* styledElement = static_cast<SVGStyledElement*>(svgElement);
    const SVGRenderStyle* svgStyle = style()->svgStyle();

    AtomicString startMarkerId(svgStyle->startMarker());
    AtomicString midMarkerId(svgStyle->midMarker());
    AtomicString endMarkerId(svgStyle->endMarker());

    SVGResourceMarker* startMarker = getMarkerById(doc, startMarkerId);
    SVGResourceMarker* midMarker = getMarkerById(doc, midMarkerId);
    SVGResourceMarker* endMarker = getMarkerById(doc, endMarkerId);

    if (!startMarker && !startMarkerId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(startMarkerId, styledElement);
    else if (startMarker)
        startMarker->addClient(styledElement);

    if (!midMarker && !midMarkerId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(midMarkerId, styledElement);
    else if (midMarker)
        midMarker->addClient(styledElement);

    if (!endMarker && !endMarkerId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(endMarkerId, styledElement);
    else if (endMarker)
        endMarker->addClient(styledElement);

    if (!startMarker && !midMarker && !endMarker)
        return FloatRect();

    double strokeWidth = SVGRenderStyle::cssPrimitiveToLength(this, svgStyle->strokeWidth(), 1.0f);
    DrawMarkersData data(context, startMarker, midMarker, strokeWidth);

    path.apply(&data, drawStartAndMidMarkers);

    data.previousMarkerData.marker = endMarker;
    data.previousMarkerData.type = End;
    drawMarkerWithData(context, data.previousMarkerData);

    // We know the marker boundaries, only after they're drawn!
    // Otherwhise we'd need to do all the marker calculation twice
    // once here (through paint()) and once in absoluteClippedOverflowRect().
    FloatRect bounds;

    if (startMarker)
        bounds.unite(startMarker->cachedBounds());

    if (midMarker)
        bounds.unite(midMarker->cachedBounds());

    if (endMarker)
        bounds.unite(endMarker->cachedBounds());

    return bounds;
}

void NumberInputType::setValueAsDecimal(const Decimal& newValue, TextFieldEventBehavior eventBehavior, ExceptionState& exceptionState) const
{
    element().setValue(serializeForNumberType(newValue), eventBehavior);
}

bool NumberInputType::typeMismatch() const
{
    ASSERT(!typeMismatchFor(element().value()));
    return false;
}

double NumberInputType::valueAsDouble() const
{
    return parseToDoubleForNumberType(element().value());
}

 TPZString asString() const
 {  return TPZString(timeStamp()) + " " + element().asString(); }

LayoutObject* SearchInputType::createLayoutObject(const ComputedStyle&) const
{
    return new LayoutSearchField(&element());
}

String NumberInputType::visibleValue() const
{
    return localizeValue(element().value());
}

bool XSAXMLScanner::scanStartTag(bool& gotData)
{
    //  Assume we will still have data until proven otherwise. It will only
    //  ever be false if this is the root and its empty.
    gotData = true;

    // Reset element content
    fContent.reset();

    //  The current position is after the open bracket, so we need to read in
    //  in the element name.
    int prefixColonPos;
    if (!fReaderMgr.getQName(fQNameBuf, &prefixColonPos))
    {
        if (fQNameBuf.isEmpty())
            emitError(XMLErrs::ExpectedElementName);
        else
            emitError(XMLErrs::InvalidElementName, fQNameBuf.getRawBuffer());
        fReaderMgr.skipToChar(chOpenAngle);
        return false;
    }

    // See if its the root element
    const bool isRoot = fElemStack.isEmpty();

    // Skip any whitespace after the name
    fReaderMgr.skipPastSpaces();

    //  First we have to do the rawest attribute scan. We don't do any
    //  normalization of them at all, since we don't know yet what type they
    //  might be (since we need the element decl in order to do that.)
    const XMLCh* qnameRawBuf = fQNameBuf.getRawBuffer();
    bool isEmpty;
    XMLSize_t attCount = rawAttrScan(qnameRawBuf, *fRawAttrList, isEmpty);

    // save the contentleafname and currentscope before addlevel, for later use
    ContentLeafNameTypeVector* cv = 0;
    XMLContentModel* cm = 0;
    unsigned int currentScope = Grammar::TOP_LEVEL_SCOPE;
    bool laxThisOne = false;
    if (!isRoot)
    {
        // schema validator will have correct type if validating
        SchemaElementDecl* tempElement = (SchemaElementDecl*)
            fElemStack.topElement()->fThisElement;
        SchemaElementDecl::ModelTypes modelType = tempElement->getModelType();
        ComplexTypeInfo *currType = 0;

        if (fValidate)
        {
            currType = ((SchemaValidator*)fValidator)->getCurrentTypeInfo();
            if (currType)
                modelType = (SchemaElementDecl::ModelTypes)currType->getContentType();
            else // something must have gone wrong
                modelType = SchemaElementDecl::Any;
        }
        else {
            currType = tempElement->getComplexTypeInfo();
        }

        if ((modelType == SchemaElementDecl::Mixed_Simple)
          ||  (modelType == SchemaElementDecl::Mixed_Complex)
          ||  (modelType == SchemaElementDecl::Children))
        {
            cm = currType->getContentModel();
            cv = cm->getContentLeafNameTypeVector();
            currentScope = fElemStack.getCurrentScope();
        }
        else if (modelType == SchemaElementDecl::Any) {
            laxThisOne = true;
        }
    }

    //  Now, since we might have to update the namespace map for this element,
    //  but we don't have the element decl yet, we just tell the element stack
    //  to expand up to get ready.
    XMLSize_t elemDepth = fElemStack.addLevel();
    fElemStack.setValidationFlag(fValidate);
    fElemStack.setPrefixColonPos(prefixColonPos);

    //  Make an initial pass through the list and find any xmlns attributes or
    //  schema attributes.
    if (attCount)
        scanRawAttrListforNameSpaces(attCount);

    //  Resolve the qualified name to a URI and name so that we can look up
    //  the element decl for this element. We have now update the prefix to
    //  namespace map so we should get the correct element now.
    unsigned int uriId = resolveQNameWithColon
    (
        qnameRawBuf, fPrefixBuf, ElemStack::Mode_Element, prefixColonPos
    );

    //if schema, check if we should lax or skip the validation of this element
    bool parentValidation = fValidate;
    if (cv) {
        QName element(fPrefixBuf.getRawBuffer(), &qnameRawBuf[prefixColonPos + 1], uriId, fMemoryManager);
        // elementDepth will be > 0, as cv is only constructed if element is not
        // root.
        laxThisOne = laxElementValidation(&element, cv, cm, elemDepth - 1);
//.........这里部分代码省略.........

bool NumberInputType::hasBadInput() const
{
    String standardValue = convertFromVisibleValue(element().innerEditorValue());
    return !standardValue.isEmpty() && !std::isfinite(parseToDoubleForNumberType(standardValue));
}

bool RenderPath::calculateLocalTransform()
{
    TransformationMatrix oldTransform = m_localTransform;
    m_localTransform = static_cast<SVGStyledTransformableElement*>(element())->animatedLocalTransform();
    return (m_localTransform != oldTransform);
}

 const T& operator()(const int nn) const
 {
   return element(nn);
 }