C++ (Cpp) HTMLSourceElement::fastGetAttribute示例

示例#1

文件： HTMLImageElement.cpp 项目： dstockwell/blink

// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
    ASSERT(isMainThread());
    Node* parent = parentNode();
    if (!parent || !isHTMLPictureElement(*parent))
        return ImageCandidate();
    for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
        if (child == this)
            return ImageCandidate();

        if (!isHTMLSourceElement(*child))
            continue;

        HTMLSourceElement* source = toHTMLSourceElement(child);
        if (!source->fastGetAttribute(srcAttr).isNull())
            UseCounter::countDeprecation(document(), UseCounter::PictureSourceSrc);
        String srcset = source->fastGetAttribute(srcsetAttr);
        if (srcset.isEmpty())
            continue;
        String type = source->fastGetAttribute(typeAttr);
        if (!type.isEmpty() && !supportedImageType(type))
            continue;

        if (!source->mediaQueryMatches())
            continue;

        ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), sourceSize(*source), source->fastGetAttribute(srcsetAttr), &document());
        if (candidate.isEmpty())
            continue;
        return candidate;
    }
    return ImageCandidate();
}

示例#2

文件： HTMLImageElement.cpp 项目： venkatarajasekhar/Qt

// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
    ASSERT(isMainThread());
    Node* parent = parentNode();
    if (!parent || !isHTMLPictureElement(*parent))
        return ImageCandidate();
    for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
        if (child == this)
            return ImageCandidate();

        if (!isHTMLSourceElement(*child))
            continue;

        HTMLSourceElement* source = toHTMLSourceElement(child);
        String srcset = source->fastGetAttribute(srcsetAttr);
        if (srcset.isEmpty())
            continue;
        String type = source->fastGetAttribute(typeAttr);
        if (!type.isEmpty() && !supportedImageType(type))
            continue;

        String media = source->fastGetAttribute(mediaAttr);
        if (!media.isEmpty()) {
            RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media);
            if (!document().mediaQueryMatcher().evaluate(mediaQueries.get()))
                continue;
        }

        unsigned effectiveSize = SizesAttributeParser::findEffectiveSize(source->fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
        ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), effectiveSize, source->fastGetAttribute(srcsetAttr));
        if (candidate.isEmpty())
            continue;
        return candidate;
    }
    return ImageCandidate();
}