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);
}
// FIXME: This function does not behave correctly with transformed frames.
static IntRect renderRectRelativeToRootDocument(RenderObject* render)
{
ASSERT(render);
IntRect rect(render->absoluteClippedOverflowRect());
if (rect.isEmpty()) {
Element* e = static_cast<Element*>(render->node());
rect = e->getRect();
}
// In cases when the |render|'s associated node is in a scrollable inner
// document, we only consider its scrollOffset if it is not offscreen.
Node* node = render->node();
Document* mainDocument = node->document()->page()->mainFrame()->document();
bool considerScrollOffset = !(hasOffscreenRect(node) && node->document() != mainDocument);
if (considerScrollOffset) {
if (FrameView* frameView = render->node()->document()->view())
rect.move(-frameView->scrollOffset());
}
// Handle nested frames.
for (Frame* frame = render->document()->frame(); frame; frame = frame->tree()->parent()) {
if (HTMLFrameOwnerElement* ownerElement = frame->ownerElement())
rect.move(ownerElement->offsetLeft(), ownerElement->offsetTop());
}
return rect;
}
Node* FocusController::findNextFocusableNode(const FocusDirection direction, const IntRect* specificRect)
{
#if PLATFORM(WKC)
CRASH_IF_STACK_OVERFLOW(WKC_STACK_MARGIN_DEFAULT);
#endif
Frame* frame = focusedOrMainFrame();
ASSERT(frame);
Document* focusedDocument = frame->document();
if (!focusedDocument)
return 0;
focusedDocument->updateLayoutIgnorePendingStylesheets();
Node* focusedNode = focusedDocument->focusedNode();
if (!focusedNode) {
if (direction == FocusDirectionUp) {
return findLastFocusableNode(m_page->mainFrame(), specificRect);
} else {
return findFirstFocusableNode(m_page->mainFrame(), specificRect);
}
}
frame = frame->tree()->top();
FocusCandidate focusCandidate;
findFocusableNodeInDirection(frame->document()->firstChild(), focusedNode, direction, 0, focusCandidate, FocusCandidate(), specificRect);
Node* node = focusCandidate.node;
if (!node || !node->isElementNode()) {
return 0;
}
if (hasOffscreenRect(node)) {
return 0;
}
return node;
}
