C++ HTMLAreaElement类代码示例

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> searchAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLAreaElement.search._get");
    HTMLAreaElement* imp = V8HTMLAreaElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8String(imp->search());
}

static v8::Handle<v8::Value> noHrefAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLAreaElement.noHref._get");
    HTMLAreaElement* imp = V8HTMLAreaElement::toNative(info.Holder());
	if (!R_check(imp)) return v8::Handle<v8::Value>(v8::Undefined());
    return v8Boolean(imp->hasAttribute(WebCore::HTMLNames::nohrefAttr));
}

 static void noHrefAttrSetter(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::AccessorInfo& info) {
   INC_STATS("DOM.HTMLAreaElement.noHref._set");
   HTMLAreaElement* imp = V8HTMLAreaElement::toNative(info.Holder());
   bool v = value->BooleanValue();
   imp->setNoHref(v);
   return;
 }

// 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;
}

LayoutRect virtualRectForAreaElementAndDirection(HTMLAreaElement& area, FocusType type)
{
    ASSERT(area.imageElement());
    // Area elements tend to overlap more than other focusable elements. We flatten the rect of the area elements
    // to minimize the effect of overlapping areas.
    LayoutRect rect = virtualRectForDirection(type, rectToAbsoluteCoordinates(area.document().frame(), area.computeRect(area.imageElement()->renderer())), 1);
    return rect;
}

bool HTMLMapElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
{
    HTMLAreaElement* defaultArea = 0;
    for (HTMLAreaElement* area = Traversal<HTMLAreaElement>::firstWithin(*this); area; area = Traversal<HTMLAreaElement>::next(*area, this)) {
        if (area->isDefault()) {
            if (!defaultArea)
                defaultArea = area;
        } else if (area->mapMouseEvent(location, size, result)) {
            return true;
        }
    }

    if (defaultArea) {
        result.setInnerNode(defaultArea);
        result.setURLElement(defaultArea);
    }
    return defaultArea;
}

bool HTMLMapElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
{
    HTMLAreaElement* defaultArea = 0;
    Element* element = this;
    while ((element = ElementTraversal::next(element, this))) {
        if (element->hasTagName(areaTag)) {
            HTMLAreaElement* areaElt = static_cast<HTMLAreaElement*>(element);
            if (areaElt->isDefault()) {
                if (!defaultArea)
                    defaultArea = areaElt;
            } else if (areaElt->mapMouseEvent(location, size, result))
                return true;
        }
    }
    
    if (defaultArea) {
        result.setInnerNode(defaultArea);
        result.setURLElement(defaultArea);
    }
    return defaultArea;
}

bool HTMLMapElement::mapMouseEvent(int x, int y, const IntSize& size, HitTestResult& result)
{
    HTMLAreaElement* defaultArea = 0;
    Node *node = this;
    while ((node = node->traverseNextNode(this))) {
        if (node->hasTagName(areaTag)) {
            HTMLAreaElement* areaElt = static_cast<HTMLAreaElement*>(node);
            if (areaElt->isDefault()) {
                if (!defaultArea)
                    defaultArea = areaElt;
            } else if (areaElt->mapMouseEvent(x, y, size, result))
                return true;
        }
    }
    
    if (defaultArea) {
        result.setInnerNode(defaultArea);
        result.setURLElement(defaultArea);
    }
    return defaultArea;
}

void RenderImage::paintAreaElementFocusRing(PaintInfo& paintInfo)
{
    Document* document = this->document();

    if (document->printing() || !document->frame()->selection()->isFocusedAndActive())
        return;

    if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
        return;

    Element* focusedElement = document->focusedElement();
    if (!focusedElement || !isHTMLAreaElement(focusedElement))
        return;

    HTMLAreaElement* areaElement = toHTMLAreaElement(focusedElement);
    if (areaElement->imageElement() != node())
        return;

    // Even if the theme handles focus ring drawing for entire elements, it won't do it for
    // an area within an image, so we don't call RenderTheme::supportsFocusRing here.

    Path path = areaElement->computePath(this);
    if (path.isEmpty())
        return;

    RenderStyle* areaElementStyle = areaElement->computedStyle();
    unsigned short outlineWidth = areaElementStyle->outlineWidth();
    if (!outlineWidth)
        return;

    // FIXME: Clip path instead of context when Skia pathops is ready.
    // https://crbug.com/251206
    GraphicsContextStateSaver savedContext(*paintInfo.context);
    paintInfo.context->clip(absoluteContentBox());
    paintInfo.context->drawFocusRing(path, outlineWidth,
        areaElementStyle->outlineOffset(),
        resolveColor(areaElementStyle, CSSPropertyOutlineColor));
}

void RenderImage::paintAreaElementFocusRing(PaintInfo& paintInfo)
{
    Document* document = this->document();
    
    if (document->printing() || !document->frame()->selection()->isFocusedAndActive())
        return;
    
    if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
        return;

    Node* focusedNode = document->focusedNode();
    if (!focusedNode || !focusedNode->hasTagName(areaTag))
        return;

    HTMLAreaElement* areaElement = static_cast<HTMLAreaElement*>(focusedNode);
    if (areaElement->imageElement() != node())
        return;

    // Even if the theme handles focus ring drawing for entire elements, it won't do it for
    // an area within an image, so we don't call RenderTheme::supportsFocusRing here.

    Path path = areaElement->computePath(this);
    if (path.isEmpty())
        return;

    // FIXME: Do we need additional code to clip the path to the image's bounding box?

    RenderStyle* areaElementStyle = areaElement->computedStyle();
    unsigned short outlineWidth = areaElementStyle->outlineWidth();
    if (!outlineWidth)
        return;

    paintInfo.context->drawFocusRing(path, outlineWidth,
        areaElementStyle->outlineOffset(),
        areaElementStyle->visitedDependentColor(CSSPropertyOutlineColor));
}

void RenderImage::paintFocusRings(PaintInfo& paintInfo, const RenderStyle* style)
{
    // Don't draw focus rings if printing.
    if (document()->printing() || !document()->frame()->selection()->isFocusedAndActive())
        return;
    
    if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
        return;

    HTMLMapElement* mapElement = imageMap();
    if (!mapElement)
        return;
    
    Document* document = mapElement->document();
    if (!document)
        return;
    
    Node* focusedNode = document->focusedNode();
    if (!focusedNode)
        return;
    
    RefPtr<HTMLCollection> areas = mapElement->areas();
    unsigned numAreas = areas->length();
    
    // FIXME: Clip the paths to the image bounding box.
    for (unsigned k = 0; k < numAreas; ++k) {
        HTMLAreaElement* areaElement = static_cast<HTMLAreaElement*>(areas->item(k));
        if (focusedNode != areaElement)
            continue;
        
        Vector<Path> focusRingPaths;
        focusRingPaths.append(areaElement->getPath(this));
        paintInfo.context->drawFocusRing(focusRingPaths, style->outlineWidth(), style->outlineOffset(), style->outlineColor());
        break;
    }
}

bool FocusController::advanceFocusDirectionally(FocusDirection direction, KeyboardEvent* event)
{
    Frame* curFrame = focusedOrMainFrame();
    ASSERT(curFrame);

    Document* focusedDocument = curFrame->document();
    if (!focusedDocument)
        return false;

    Node* focusedNode = focusedDocument->focusedNode();
    Node* container = focusedDocument;

    if (container->isDocumentNode())
        static_cast<Document*>(container)->updateLayoutIgnorePendingStylesheets();
        
    // Figure out the starting rect.
    LayoutRect startingRect;
    if (focusedNode) {
        if (!hasOffscreenRect(focusedNode)) {
            container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, focusedNode);
            startingRect = nodeRectInAbsoluteCoordinates(focusedNode, true /* ignore border */);
        } else if (focusedNode->hasTagName(areaTag)) {
            HTMLAreaElement* area = static_cast<HTMLAreaElement*>(focusedNode);
            container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, area->imageElement());
            startingRect = virtualRectForAreaElementAndDirection(area, direction);
        }
    }

    bool consumed = false;
    do {
        consumed = advanceFocusDirectionallyInContainer(container, startingRect, direction, event);
        startingRect = nodeRectInAbsoluteCoordinates(container, true /* ignore border */);
        container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, container);
        if (container && container->isDocumentNode())
            static_cast<Document*>(container)->updateLayoutIgnorePendingStylesheets();
    } while (!consumed && container);

    return consumed;
}

static v8::Handle<v8::Value> hrefAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
    INC_STATS("DOM.HTMLAreaElement.href._get");
    HTMLAreaElement* imp = V8HTMLAreaElement::toNative(info.Holder());
    return v8String(imp->getURLAttribute(WebCore::HTMLNames::hrefAttr));
}

 static v8::Handle<v8::Value> noHrefAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info) {
   INC_STATS("DOM.HTMLAreaElement.noHref._get");
   HTMLAreaElement* imp = V8HTMLAreaElement::toNative(info.Holder());
   return v8Boolean(imp->noHref());
 }