C++ HTMLImageElement类代码示例

static void appendServerMapMousePosition(String& url, Event* event)
{
    if (!event->isMouseEvent())
        return;

    ASSERT(event->target());
    Node* target = event->target()->toNode();
    ASSERT(target);
    if (!target->hasTagName(imgTag))
        return;

    HTMLImageElement* imageElement = static_cast<HTMLImageElement*>(event->target()->toNode());
    if (!imageElement || !imageElement->isServerMap())
        return;

    RenderImage* renderer = toRenderImage(imageElement->renderer());
    if (!renderer)
        return;

    // FIXME: This should probably pass true for useTransforms.
    FloatPoint absolutePosition = renderer->absoluteToLocal(FloatPoint(static_cast<MouseEvent*>(event)->pageX(), static_cast<MouseEvent*>(event)->pageY()));
    int x = absolutePosition.x();
    int y = absolutePosition.y();
    url += "?";
    url += String::number(x);
    url += ",";
    url += String::number(y);
}

Element* HTMLFormCollection::getNamedFormItem(const QualifiedName& attrName, const String& name, int duplicateNumber) const
{
    HTMLFormElement* form = static_cast<HTMLFormElement*>(base());

    bool foundInputElements = false;
    for (unsigned i = 0; i < form->m_associatedElements.size(); ++i) {
        FormAssociatedElement* associatedElement = form->m_associatedElements[i];
        HTMLElement* element = toHTMLElement(associatedElement);
        if (associatedElement->isEnumeratable() && element->getAttribute(attrName) == name) {
            foundInputElements = true;
            if (!duplicateNumber)
                return element;
            --duplicateNumber;
        }
    }

    if (!foundInputElements) {
        for (unsigned i = 0; i < form->m_imageElements.size(); ++i) {
            HTMLImageElement* element = form->m_imageElements[i];
            if (element->getAttribute(attrName) == name) {
                if (!duplicateNumber)
                    return element;
                --duplicateNumber;
            }
        }
    }

    return 0;
}

const AtomicString& HitTestResult::altDisplayString() const
{
    if (!m_innerNonSharedNode)
        return nullAtom;

    if (m_innerNonSharedNode->hasTagName(imgTag)) {
        HTMLImageElement* image = toHTMLImageElement(m_innerNonSharedNode);
        return image->getAttribute(altAttr);
    }

    if (m_innerNonSharedNode->hasTagName(inputTag)) {
        HTMLInputElement* input = toHTMLInputElement(m_innerNonSharedNode);
        return input->alt();
    }

#if ENABLE(WML)
    if (m_innerNonSharedNode->hasTagName(WMLNames::imgTag)) {
        WMLImageElement* image = toWMLImageElement(m_innerNonSharedNode);
        // FIXME
        return image->fastGetAttribute(altAttr);//image->altText();
    }
#endif

    return nullAtom;
}

void PageSerializer::serializeFrame(Frame* frame)
{
    Document* document = frame->document();
    URL url = document->url();
    if (!url.isValid() || url.isBlankURL()) {
        // For blank frames we generate a fake URL so they can be referenced by their containing frame.
        url = urlForBlankFrame(frame);
    }

    if (m_resourceURLs.contains(url)) {
        // FIXME: We could have 2 frame with the same URL but which were dynamically changed and have now
        // different content. So we should serialize both and somehow rename the frame src in the containing
        // frame. Arg!
        return;
    }

    Vector<Node*> nodes;
    SerializerMarkupAccumulator accumulator(*this, *document, &nodes);
    TextEncoding textEncoding(document->charset());
    CString data;
    if (!textEncoding.isValid()) {
        // FIXME: iframes used as images trigger this. We should deal with them correctly.
        return;
    }
    String text = accumulator.serializeNodes(*document->documentElement(), 0, IncludeNode);
    CString frameHTML = textEncoding.encode(text, EntitiesForUnencodables);
    m_resources->append(Resource(url, document->suggestedMIMEType(), SharedBuffer::create(frameHTML.data(), frameHTML.length())));
    m_resourceURLs.add(url);

    for (Vector<Node*>::iterator iter = nodes.begin(); iter != nodes.end(); ++iter) {
        Node* node = *iter;
        if (!node->isElementNode())
            continue;

        Element* element = toElement(node);
        // We have to process in-line style as it might contain some resources (typically background images).
        if (element->isStyledElement())
            retrieveResourcesForProperties(toStyledElement(element)->inlineStyle(), document);

        if (isHTMLImageElement(element)) {
            HTMLImageElement* imageElement = toHTMLImageElement(element);
            URL url = document->completeURL(imageElement->getAttribute(HTMLNames::srcAttr));
            CachedImage* cachedImage = imageElement->cachedImage();
            addImageToResources(cachedImage, imageElement->renderer(), url);
        } else if (element->hasTagName(HTMLNames::linkTag)) {
            HTMLLinkElement* linkElement = toHTMLLinkElement(element);
            if (CSSStyleSheet* sheet = linkElement->sheet()) {
                URL url = document->completeURL(linkElement->getAttribute(HTMLNames::hrefAttr));
                serializeCSSStyleSheet(sheet, url);
                ASSERT(m_resourceURLs.contains(url));
            }
        } else if (isHTMLStyleElement(element)) {
            if (CSSStyleSheet* sheet = toHTMLStyleElement(element)->sheet())
                serializeCSSStyleSheet(sheet, URL());
        }
    }

    for (Frame* childFrame = frame->tree().firstChild(); childFrame; childFrame = childFrame->tree().nextSibling())
        serializeFrame(childFrame);
}

// This method filters what element will get tap-highlight'ed or not. To start with,
// we are going to highlight links (anchors with a valid href element), and elements
// whose tap highlight color value is different than the default value.
static Element* elementForTapHighlight(Element* elementUnderFatFinger)
{
    // Do not bail out right way here if there element does not have a renderer.
    // It is the casefor <map> (descendent of <area>) elements. The associated <image>
    // element actually has the renderer.
    if (elementUnderFatFinger->renderer()) {
        Color tapHighlightColor = elementUnderFatFinger->renderStyle()->tapHighlightColor();
        if (tapHighlightColor != RenderTheme::defaultTheme()->platformTapHighlightColor())
            return elementUnderFatFinger;
    }

    bool isArea = elementUnderFatFinger->hasTagName(HTMLNames::areaTag);
    Node* linkNode = elementUnderFatFinger->enclosingLinkEventParentOrSelf();
    if (!linkNode || !linkNode->isHTMLElement() || (!linkNode->renderer() && !isArea))
        return 0;

    ASSERT(linkNode->isLink());

    // FatFingers class selector ensure only anchor with valid href attr value get here.
    // It includes empty hrefs.
    Element* highlightCandidateElement = static_cast<Element*>(linkNode);

    if (!isArea)
        return highlightCandidateElement;

    HTMLAreaElement* area = static_cast<HTMLAreaElement*>(highlightCandidateElement);
    HTMLImageElement* image = area->imageElement();
    if (image && image->renderer())
        return image;

    return 0;
}

static void appendServerMapMousePosition(StringBuilder& url, Event* event)
{
    if (!event->isMouseEvent())
        return;

    ASSERT(event->target());
    Node* target = event->target()->toNode();
    ASSERT(target);
    if (!isHTMLImageElement(target))
        return;

    HTMLImageElement* imageElement = toHTMLImageElement(target);
    if (!imageElement || !imageElement->isServerMap())
        return;

    if (!imageElement->renderer() || !imageElement->renderer()->isRenderImage())
        return;
    RenderImage* renderer = toRenderImage(imageElement->renderer());

    // FIXME: This should probably pass true for useTransforms.
    FloatPoint absolutePosition = renderer->absoluteToLocal(FloatPoint(toMouseEvent(event)->pageX(), toMouseEvent(event)->pageY()));
    int x = absolutePosition.x();
    int y = absolutePosition.y();
    url.append('?');
    url.appendNumber(x);
    url.append(',');
    url.appendNumber(y);
}

static v8::Handle<v8::Value> isMapAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLImageElement.isMap._get");
    HTMLImageElement* imp = V8HTMLImageElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8Boolean(imp->hasAttribute(WebCore::HTMLNames::ismapAttr));
}

static v8::Handle<v8::Value> vspaceAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLImageElement.vspace._get");
    HTMLImageElement* imp = V8HTMLImageElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8::Integer::New(imp->getIntegralAttribute(WebCore::HTMLNames::vspaceAttr));
}

void RenderImage::readyWRATHWidgetIntoRect(PaintedWidgetsOfWRATHHandle& handle,
        ContextOfWRATH *wrath_context, const IntRect& rect)
{
    RenderImage_ReadyWRATHWidgetIntoRect *d(RenderImage_ReadyWRATHWidgetIntoRect::object(this, handle));
    ContextOfWRATH::AutoPushNode autoPushRoot(wrath_context, d->m_root_node);

    d->m_image.visible(false);

    if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || rect.width() <= 0 || rect.height() <= 0) {
        return;
    }

    RefPtr<Image> img = m_imageResource->image(rect.width(), rect.height());
    if (!img || img->isNull()) {
        return;
    }

    HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0;
    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
    Image* image = m_imageResource->image().get();
    /*
    bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, rect.size());
    [WRATH-TODO]: What to do with the above function call?
    */

    /*
    context->drawImage(m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
    */

    d->m_image.visible(true);
    WRATH_drawImage(d->m_image, wrath_context,
                    m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, false /*useLowQualityScaling*/);

}

static v8::Handle<v8::Value> lowsrcAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLImageElement.lowsrc._get");
    HTMLImageElement* imp = V8HTMLImageElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8String(imp->getURLAttribute(WebCore::HTMLNames::lowsrcAttr));
}

static v8::Handle<v8::Value> completeAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLImageElement.complete._get");
    HTMLImageElement* imp = V8HTMLImageElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8Boolean(imp->complete());
}

Element* HTMLFormCollection::getNamedFormItem(const QualifiedName& attrName, const String& name, int duplicateNumber) const
{
    HTMLFormElement* form = static_cast<HTMLFormElement*>(base());

    bool foundInputElements = false;
    for (unsigned i = 0; i < form->formElements.size(); ++i) {
        HTMLFormControlElement* e = form->formElements[i];
        const QualifiedName& attributeName = (attrName == idAttr) ? e->idAttributeName() : attrName;
        if (e->isEnumeratable() && e->getAttribute(attributeName) == name) {
            foundInputElements = true;
            if (!duplicateNumber)
                return e;
            --duplicateNumber;
        }
    }

    if (!foundInputElements) {
        for (unsigned i = 0; i < form->imgElements.size(); ++i) {
            HTMLImageElement* e = form->imgElements[i];
            const QualifiedName& attributeName = (attrName == idAttr) ? e->idAttributeName() : attrName;
            if (e->getAttribute(attributeName) == name) {
                if (!duplicateNumber)
                    return e;
                --duplicateNumber;
            }
        }
    }

    return 0;
}

nsresult
HTMLSourceElement::BindToTree(nsIDocument *aDocument,
                              nsIContent *aParent,
                              nsIContent *aBindingParent,
                              bool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument,
                                                 aParent,
                                                 aBindingParent,
                                                 aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aParent && aParent->IsNodeOfType(nsINode::eMEDIA)) {
    HTMLMediaElement* media = static_cast<HTMLMediaElement*>(aParent);
    media->NotifyAddedSource();
  } else if (aParent && aParent->IsHTMLElement(nsGkAtoms::picture)) {
    // Find any img siblings after this <source> and notify them
    nsCOMPtr<nsIContent> sibling = AsContent();
    while ( (sibling = sibling->GetNextSibling()) ) {
      if (sibling->IsHTMLElement(nsGkAtoms::img)) {
        HTMLImageElement *img = static_cast<HTMLImageElement*>(sibling.get());
        img->PictureSourceAdded(AsContent());
      }
    }
  }

  return NS_OK;
}

FocusCandidate::FocusCandidate(Node* node, FocusDirection direction)
    : visibleNode(0)
    , focusableNode(0)
    , enclosingScrollableBox(0)
    , distance(maxDistance())
    , parentDistance(maxDistance())
    , alignment(None)
    , parentAlignment(None)
    , isOffscreen(true)
    , isOffscreenAfterScrolling(true)
{
    ASSERT(node);
    ASSERT(node->isElementNode());

    if (node->hasTagName(HTMLNames::areaTag)) {
        HTMLAreaElement* area = static_cast<HTMLAreaElement*>(node);
        HTMLImageElement* image = area->imageElement();
        if (!image || !image->renderer())
            return;

        visibleNode = image;
        rect = virtualRectForAreaElementAndDirection(area, direction);
    } else {
        if (!node->renderer())
            return;

        visibleNode = node;
        rect = nodeRectInAbsoluteCoordinates(node, true /* ignore border */);
    }

    focusableNode = node;
    isOffscreen = hasOffscreenRect(visibleNode);
    isOffscreenAfterScrolling = hasOffscreenRect(visibleNode, direction);
}

static v8::Handle<v8::Value> heightAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLImageElement.height._get");
    HTMLImageElement* imp = V8HTMLImageElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8::Integer::New(imp->height());
}