FocusController.cpp [plain text]
#include "config.h"
#include "FocusController.h"
#include "AXObjectCache.h"
#include "Chrome.h"
#include "Document.h"
#include "Editor.h"
#include "EditorClient.h"
#include "Element.h"
#include "ElementShadow.h"
#include "Event.h"
#include "EventHandler.h"
#include "EventNames.h"
#include "ExceptionCode.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "HTMLAreaElement.h"
#include "HTMLImageElement.h"
#include "HTMLNames.h"
#include "HitTestResult.h"
#include "KeyboardEvent.h"
#include "NodeRenderingTraversal.h"
#include "NodeTraversal.h"
#include "Page.h"
#include "Range.h"
#include "RenderObject.h"
#include "RenderWidget.h"
#include "ScrollAnimator.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SpatialNavigation.h"
#include "Widget.h"
#include "htmlediting.h" // For firstPositionInOrBeforeNode
#include <limits>
namespace WebCore {
using namespace HTMLNames;
using namespace std;
FocusNavigationScope::FocusNavigationScope(TreeScope* treeScope)
: m_rootTreeScope(treeScope)
{
ASSERT(treeScope);
}
ContainerNode* FocusNavigationScope::rootNode() const
{
return m_rootTreeScope->rootNode();
}
Element* FocusNavigationScope::owner() const
{
ContainerNode* root = rootNode();
if (root->isShadowRoot())
return toShadowRoot(root)->host();
if (Frame* frame = root->document()->frame())
return frame->ownerElement();
return 0;
}
FocusNavigationScope FocusNavigationScope::focusNavigationScopeOf(Node* node)
{
ASSERT(node);
Node* root = node;
for (Node* n = node; n; n = NodeRenderingTraversal::parentInScope(n))
root = n;
return FocusNavigationScope(root->treeScope());
}
FocusNavigationScope FocusNavigationScope::focusNavigationScopeOwnedByShadowHost(Node* node)
{
ASSERT(isShadowHost(node));
return FocusNavigationScope(toElement(node)->shadow()->shadowRoot());
}
FocusNavigationScope FocusNavigationScope::focusNavigationScopeOwnedByIFrame(HTMLFrameOwnerElement* frame)
{
ASSERT(frame && frame->contentFrame());
return FocusNavigationScope(frame->contentFrame()->document());
}
static inline void dispatchEventsOnWindowAndFocusedElement(Document* document, bool focused)
{
if (Page* page = document->page()) {
if (page->defersLoading())
return;
}
if (!focused && document->focusedElement())
document->focusedElement()->dispatchBlurEvent(0);
document->dispatchWindowEvent(Event::create(focused ? eventNames().focusEvent : eventNames().blurEvent, false, false));
if (focused && document->focusedElement())
document->focusedElement()->dispatchFocusEvent(0, FocusDirectionNone);
}
static inline bool hasCustomFocusLogic(Node* node)
{
return node->isHTMLElement() && toHTMLElement(node)->hasCustomFocusLogic();
}
static inline bool isNonFocusableShadowHost(Element* element, KeyboardEvent* event)
{
ASSERT(element);
return !element->isKeyboardFocusable(event) && isShadowHost(element) && !hasCustomFocusLogic(element);
}
static inline bool isFocusableShadowHost(Node* node, KeyboardEvent* event)
{
ASSERT(node);
return node->isElementNode() && toElement(node)->isKeyboardFocusable(event) && isShadowHost(node) && !hasCustomFocusLogic(node);
}
static inline int adjustedTabIndex(Node* node, KeyboardEvent* event)
{
ASSERT(node);
if (!node->isElementNode())
return 0;
return isNonFocusableShadowHost(toElement(node), event) ? 0 : toElement(node)->tabIndex();
}
static inline bool shouldVisit(Element* element, KeyboardEvent* event)
{
ASSERT(element);
return element->isKeyboardFocusable(event) || isNonFocusableShadowHost(element, event);
}
FocusController::FocusController(Page* page)
: m_page(page)
, m_isActive(false)
, m_isFocused(false)
, m_isChangingFocusedFrame(false)
, m_containingWindowIsVisible(false)
{
}
PassOwnPtr<FocusController> FocusController::create(Page* page)
{
return adoptPtr(new FocusController(page));
}
void FocusController::setFocusedFrame(PassRefPtr<Frame> frame)
{
ASSERT(!frame || frame->page() == m_page);
if (m_focusedFrame == frame || m_isChangingFocusedFrame)
return;
m_isChangingFocusedFrame = true;
RefPtr<Frame> oldFrame = m_focusedFrame;
RefPtr<Frame> newFrame = frame;
m_focusedFrame = newFrame;
if (oldFrame && oldFrame->view()) {
oldFrame->selection()->setFocused(false);
oldFrame->document()->dispatchWindowEvent(Event::create(eventNames().blurEvent, false, false));
}
if (newFrame && newFrame->view() && isFocused()) {
newFrame->selection()->setFocused(true);
newFrame->document()->dispatchWindowEvent(Event::create(eventNames().focusEvent, false, false));
}
m_page->chrome().focusedFrameChanged(newFrame.get());
m_isChangingFocusedFrame = false;
}
Frame* FocusController::focusedOrMainFrame() const
{
if (Frame* frame = focusedFrame())
return frame;
return m_page->mainFrame();
}
void FocusController::setFocused(bool focused)
{
if (isFocused() == focused)
return;
m_isFocused = focused;
if (!m_isFocused)
focusedOrMainFrame()->eventHandler()->stopAutoscrollTimer();
if (!m_focusedFrame)
setFocusedFrame(m_page->mainFrame());
if (m_focusedFrame->view()) {
m_focusedFrame->selection()->setFocused(focused);
dispatchEventsOnWindowAndFocusedElement(m_focusedFrame->document(), focused);
}
}
Element* FocusController::findFocusableElementDescendingDownIntoFrameDocument(FocusDirection direction, Element* element, KeyboardEvent* event)
{
while (element && element->isFrameOwnerElement()) {
HTMLFrameOwnerElement* owner = toFrameOwnerElement(element);
if (!owner->contentFrame())
break;
Element* foundElement = findFocusableElement(direction, FocusNavigationScope::focusNavigationScopeOwnedByIFrame(owner), 0, event);
if (!foundElement)
break;
ASSERT(element != foundElement);
element = foundElement;
}
return element;
}
bool FocusController::setInitialFocus(FocusDirection direction, KeyboardEvent* event)
{
bool didAdvanceFocus = advanceFocus(direction, event, true);
if (AXObjectCache* cache = focusedOrMainFrame()->document()->existingAXObjectCache())
cache->postNotification(focusedOrMainFrame()->document(), AXObjectCache::AXFocusedUIElementChanged, true);
return didAdvanceFocus;
}
bool FocusController::advanceFocus(FocusDirection direction, KeyboardEvent* event, bool initialFocus)
{
switch (direction) {
case FocusDirectionForward:
case FocusDirectionBackward:
return advanceFocusInDocumentOrder(direction, event, initialFocus);
case FocusDirectionLeft:
case FocusDirectionRight:
case FocusDirectionUp:
case FocusDirectionDown:
return advanceFocusDirectionally(direction, event);
default:
ASSERT_NOT_REACHED();
}
return false;
}
bool FocusController::advanceFocusInDocumentOrder(FocusDirection direction, KeyboardEvent* event, bool initialFocus)
{
Frame* frame = focusedOrMainFrame();
ASSERT(frame);
Document* document = frame->document();
Node* currentNode = document->focusedElement();
bool caretBrowsing = frame->settings() && frame->settings()->caretBrowsingEnabled();
if (caretBrowsing && !currentNode)
currentNode = frame->selection()->start().deprecatedNode();
document->updateLayoutIgnorePendingStylesheets();
RefPtr<Element> element = findFocusableElementAcrossFocusScope(direction, FocusNavigationScope::focusNavigationScopeOf(currentNode ? currentNode : document), currentNode, event);
if (!element) {
if (!initialFocus && m_page->chrome().canTakeFocus(direction)) {
document->setFocusedElement(0);
setFocusedFrame(0);
m_page->chrome().takeFocus(direction);
return true;
}
element = findFocusableElementRecursively(direction, FocusNavigationScope::focusNavigationScopeOf(m_page->mainFrame()->document()), 0, event);
element = findFocusableElementDescendingDownIntoFrameDocument(direction, element.get(), event);
if (!element)
return false;
}
ASSERT(element);
if (element == document->focusedElement()) {
return true;
}
if (element->isFrameOwnerElement() && (!element->isPluginElement() || !element->isKeyboardFocusable(event))) {
HTMLFrameOwnerElement* owner = toFrameOwnerElement(element.get());
if (!owner->contentFrame())
return false;
document->setFocusedElement(0);
setFocusedFrame(owner->contentFrame());
return true;
}
Document* newDocument = element->document();
if (newDocument != document) {
document->setFocusedElement(0);
}
if (newDocument)
setFocusedFrame(newDocument->frame());
if (caretBrowsing) {
Position position = firstPositionInOrBeforeNode(element.get());
VisibleSelection newSelection(position, position, DOWNSTREAM);
if (frame->selection()->shouldChangeSelection(newSelection))
frame->selection()->setSelection(newSelection);
}
element->focus(false, direction);
return true;
}
Element* FocusController::findFocusableElementAcrossFocusScope(FocusDirection direction, FocusNavigationScope scope, Node* currentNode, KeyboardEvent* event)
{
ASSERT(!currentNode || !currentNode->isElementNode() || !isNonFocusableShadowHost(toElement(currentNode), event));
Element* found;
if (currentNode && direction == FocusDirectionForward && isFocusableShadowHost(currentNode, event)) {
Element* foundInInnerFocusScope = findFocusableElementRecursively(direction, FocusNavigationScope::focusNavigationScopeOwnedByShadowHost(currentNode), 0, event);
found = foundInInnerFocusScope ? foundInInnerFocusScope : findFocusableElementRecursively(direction, scope, currentNode, event);
} else
found = findFocusableElementRecursively(direction, scope, currentNode, event);
while (!found) {
Element* owner = scope.owner();
if (!owner)
break;
scope = FocusNavigationScope::focusNavigationScopeOf(owner);
if (direction == FocusDirectionBackward && isFocusableShadowHost(owner, event)) {
found = owner;
break;
}
found = findFocusableElementRecursively(direction, scope, owner, event);
}
found = findFocusableElementDescendingDownIntoFrameDocument(direction, found, event);
return found;
}
Element* FocusController::findFocusableElementRecursively(FocusDirection direction, FocusNavigationScope scope, Node* start, KeyboardEvent* event)
{
Element* found = findFocusableElement(direction, scope, start, event);
if (!found)
return 0;
if (direction == FocusDirectionForward) {
if (!isNonFocusableShadowHost(found, event))
return found;
Element* foundInInnerFocusScope = findFocusableElementRecursively(direction, FocusNavigationScope::focusNavigationScopeOwnedByShadowHost(found), 0, event);
return foundInInnerFocusScope ? foundInInnerFocusScope : findFocusableElementRecursively(direction, scope, found, event);
}
ASSERT(direction == FocusDirectionBackward);
if (isFocusableShadowHost(found, event)) {
Element* foundInInnerFocusScope = findFocusableElementRecursively(direction, FocusNavigationScope::focusNavigationScopeOwnedByShadowHost(found), 0, event);
return foundInInnerFocusScope ? foundInInnerFocusScope : found;
}
if (isNonFocusableShadowHost(found, event)) {
Element* foundInInnerFocusScope = findFocusableElementRecursively(direction, FocusNavigationScope::focusNavigationScopeOwnedByShadowHost(found), 0, event);
return foundInInnerFocusScope ? foundInInnerFocusScope :findFocusableElementRecursively(direction, scope, found, event);
}
return found;
}
Element* FocusController::findFocusableElement(FocusDirection direction, FocusNavigationScope scope, Node* node, KeyboardEvent* event)
{
return (direction == FocusDirectionForward)
? nextFocusableElement(scope, node, event)
: previousFocusableElement(scope, node, event);
}
Element* FocusController::findElementWithExactTabIndex(Node* start, int tabIndex, KeyboardEvent* event, FocusDirection direction)
{
using namespace NodeRenderingTraversal;
for (Node* node = start; node; node = direction == FocusDirectionForward ? nextInScope(node) : previousInScope(node)) {
if (!node->isElementNode())
continue;
Element* element = toElement(node);
if (shouldVisit(element, event) && adjustedTabIndex(element, event) == tabIndex)
return element;
}
return 0;
}
static Element* nextElementWithGreaterTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
{
int winningTabIndex = std::numeric_limits<short>::max() + 1;
Element* winner = 0;
for (Node* node = start; node; node = NodeRenderingTraversal::nextInScope(node)) {
if (!node->isElementNode())
continue;
Element* element = toElement(node);
if (shouldVisit(element, event) && element->tabIndex() > tabIndex && element->tabIndex() < winningTabIndex) {
winner = element;
winningTabIndex = element->tabIndex();
}
}
return winner;
}
static Element* previousElementWithLowerTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
{
int winningTabIndex = 0;
Element* winner = 0;
for (Node* node = start; node; node = NodeRenderingTraversal::previousInScope(node)) {
if (!node->isElementNode())
continue;
Element* element = toElement(node);
int currentTabIndex = adjustedTabIndex(element, event);
if ((shouldVisit(element, event) || isNonFocusableShadowHost(element, event)) && currentTabIndex < tabIndex && currentTabIndex > winningTabIndex) {
winner = element;
winningTabIndex = currentTabIndex;
}
}
return winner;
}
Element* FocusController::nextFocusableElement(FocusNavigationScope scope, Node* start, KeyboardEvent* event)
{
using namespace NodeRenderingTraversal;
if (start) {
int tabIndex = adjustedTabIndex(start, event);
if (tabIndex < 0) {
for (Node* node = nextInScope(start); node; node = nextInScope(node)) {
if (!node->isElementNode())
continue;
Element* element = toElement(node);
if (shouldVisit(element, event) && adjustedTabIndex(element, event) >= 0)
return element;
}
}
if (Element* winner = findElementWithExactTabIndex(nextInScope(start), tabIndex, event, FocusDirectionForward))
return winner;
if (!tabIndex)
return 0;
}
if (Element* winner = nextElementWithGreaterTabIndex(scope.rootNode(), start ? adjustedTabIndex(start, event) : 0, event))
return winner;
return findElementWithExactTabIndex(scope.rootNode(), 0, event, FocusDirectionForward);
}
Element* FocusController::previousFocusableElement(FocusNavigationScope scope, Node* start, KeyboardEvent* event)
{
using namespace NodeRenderingTraversal;
Node* last = 0;
for (Node* node = scope.rootNode(); node; node = lastChildInScope(node))
last = node;
ASSERT(last);
Node* startingNode;
int startingTabIndex;
if (start) {
startingNode = previousInScope(start);
startingTabIndex = adjustedTabIndex(start, event);
} else {
startingNode = last;
startingTabIndex = 0;
}
if (startingTabIndex < 0) {
for (Node* node = startingNode; node; node = previousInScope(node)) {
if (!node->isElementNode())
continue;
Element* element = toElement(node);
if (shouldVisit(element, event) && adjustedTabIndex(element, event) >= 0)
return element;
}
}
if (Element* winner = findElementWithExactTabIndex(startingNode, startingTabIndex, event, FocusDirectionBackward))
return winner;
startingTabIndex = (start && startingTabIndex) ? startingTabIndex : std::numeric_limits<short>::max();
return previousElementWithLowerTabIndex(last, startingTabIndex, event);
}
static bool relinquishesEditingFocus(Node *node)
{
ASSERT(node);
ASSERT(node->rendererIsEditable());
Node* root = node->rootEditableElement();
Frame* frame = node->document()->frame();
if (!frame || !root)
return false;
return frame->editor().shouldEndEditing(rangeOfContents(root).get());
}
static void clearSelectionIfNeeded(Frame* oldFocusedFrame, Frame* newFocusedFrame, Node* newFocusedNode)
{
if (!oldFocusedFrame || !newFocusedFrame)
return;
if (oldFocusedFrame->document() != newFocusedFrame->document())
return;
FrameSelection* s = oldFocusedFrame->selection();
if (s->isNone())
return;
bool caretBrowsing = oldFocusedFrame->settings()->caretBrowsingEnabled();
if (caretBrowsing)
return;
Node* selectionStartNode = s->selection().start().deprecatedNode();
if (selectionStartNode == newFocusedNode || selectionStartNode->isDescendantOf(newFocusedNode) || selectionStartNode->deprecatedShadowAncestorNode() == newFocusedNode)
return;
if (Node* mousePressNode = newFocusedFrame->eventHandler()->mousePressNode()) {
if (mousePressNode->renderer() && !mousePressNode->canStartSelection()) {
Node * root = s->rootEditableElement();
if (!root)
return;
if (Node* shadowAncestorNode = root->deprecatedShadowAncestorNode()) {
if (!shadowAncestorNode->hasTagName(inputTag) && !shadowAncestorNode->hasTagName(textareaTag))
return;
}
}
}
s->clear();
}
bool FocusController::setFocusedElement(Element* element, PassRefPtr<Frame> newFocusedFrame, FocusDirection direction)
{
RefPtr<Frame> oldFocusedFrame = focusedFrame();
RefPtr<Document> oldDocument = oldFocusedFrame ? oldFocusedFrame->document() : 0;
Element* oldFocusedElement = oldDocument ? oldDocument->focusedElement() : 0;
if (oldFocusedElement == element)
return true;
if (oldFocusedElement && oldFocusedElement->isRootEditableElement() && !relinquishesEditingFocus(oldFocusedElement))
return false;
m_page->editorClient()->willSetInputMethodState();
clearSelectionIfNeeded(oldFocusedFrame.get(), newFocusedFrame.get(), element);
if (!element) {
if (oldDocument)
oldDocument->setFocusedElement(0);
m_page->editorClient()->setInputMethodState(false);
return true;
}
RefPtr<Document> newDocument = element->document();
if (newDocument && newDocument->focusedElement() == element) {
m_page->editorClient()->setInputMethodState(element->shouldUseInputMethod());
return true;
}
if (oldDocument && oldDocument != newDocument)
oldDocument->setFocusedElement(0);
if (newFocusedFrame && !newFocusedFrame->page()) {
setFocusedFrame(0);
return false;
}
setFocusedFrame(newFocusedFrame);
RefPtr<Element> protect(element);
if (newDocument) {
bool successfullyFocused = newDocument->setFocusedElement(element, direction);
if (!successfullyFocused)
return false;
}
if (newDocument->focusedElement() == element)
m_page->editorClient()->setInputMethodState(element->shouldUseInputMethod());
return true;
}
void FocusController::setActive(bool active)
{
if (m_isActive == active)
return;
m_isActive = active;
if (FrameView* view = m_page->mainFrame()->view()) {
if (!view->platformWidget()) {
view->updateLayoutAndStyleIfNeededRecursive();
view->updateControlTints();
}
}
focusedOrMainFrame()->selection()->pageActivationChanged();
if (m_focusedFrame && isFocused())
dispatchEventsOnWindowAndFocusedElement(m_focusedFrame->document(), active);
}
static void contentAreaDidShowOrHide(ScrollableArea* scrollableArea, bool didShow)
{
if (didShow)
scrollableArea->contentAreaDidShow();
else
scrollableArea->contentAreaDidHide();
}
void FocusController::setContainingWindowIsVisible(bool containingWindowIsVisible)
{
if (m_containingWindowIsVisible == containingWindowIsVisible)
return;
m_containingWindowIsVisible = containingWindowIsVisible;
FrameView* view = m_page->mainFrame()->view();
if (!view)
return;
contentAreaDidShowOrHide(view, containingWindowIsVisible);
for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
FrameView* frameView = frame->view();
if (!frameView)
continue;
const HashSet<ScrollableArea*>* scrollableAreas = frameView->scrollableAreas();
if (!scrollableAreas)
continue;
for (HashSet<ScrollableArea*>::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
ScrollableArea* scrollableArea = *it;
ASSERT(scrollableArea->scrollbarsCanBeActive() || m_page->shouldSuppressScrollbarAnimations());
contentAreaDidShowOrHide(scrollableArea, containingWindowIsVisible);
}
}
}
static void updateFocusCandidateIfNeeded(FocusDirection direction, const FocusCandidate& current, FocusCandidate& candidate, FocusCandidate& closest)
{
ASSERT(candidate.visibleNode->isElementNode());
ASSERT(candidate.visibleNode->renderer());
if (frameOwnerElement(candidate) && (!frameOwnerElement(candidate)->contentFrame() || candidate.rect.isEmpty()))
return;
if (candidate.isOffscreen && !canBeScrolledIntoView(direction, candidate))
return;
distanceDataForNode(direction, current, candidate);
if (candidate.distance == maxDistance())
return;
if (candidate.isOffscreenAfterScrolling && candidate.alignment < Full)
return;
if (closest.isNull()) {
closest = candidate;
return;
}
LayoutRect intersectionRect = intersection(candidate.rect, closest.rect);
if (!intersectionRect.isEmpty() && !areElementsOnSameLine(closest, candidate)) {
LayoutUnit x = intersectionRect.x() + intersectionRect.width() / 2;
LayoutUnit y = intersectionRect.y() + intersectionRect.height() / 2;
HitTestResult result = candidate.visibleNode->document()->page()->mainFrame()->eventHandler()->hitTestResultAtPoint(IntPoint(x, y), HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::IgnoreClipping | HitTestRequest::DisallowShadowContent);
if (candidate.visibleNode->contains(result.innerNode())) {
closest = candidate;
return;
}
if (closest.visibleNode->contains(result.innerNode()))
return;
}
if (candidate.alignment == closest.alignment) {
if (candidate.distance < closest.distance)
closest = candidate;
return;
}
if (candidate.alignment > closest.alignment)
closest = candidate;
}
void FocusController::findFocusCandidateInContainer(Node* container, const LayoutRect& startingRect, FocusDirection direction, KeyboardEvent* event, FocusCandidate& closest)
{
ASSERT(container);
Node* focusedNode = (focusedFrame() && focusedFrame()->document()) ? focusedFrame()->document()->focusedElement() : 0;
Element* element = ElementTraversal::firstWithin(container);
FocusCandidate current;
current.rect = startingRect;
current.focusableNode = focusedNode;
current.visibleNode = focusedNode;
for (; element; element = (element->isFrameOwnerElement() || canScrollInDirection(element, direction))
? ElementTraversal::nextSkippingChildren(element, container)
: ElementTraversal::next(element, container)) {
if (element == focusedNode)
continue;
if (!element->isKeyboardFocusable(event) && !element->isFrameOwnerElement() && !canScrollInDirection(element, direction))
continue;
FocusCandidate candidate = FocusCandidate(element, direction);
if (candidate.isNull())
continue;
candidate.enclosingScrollableBox = container;
updateFocusCandidateIfNeeded(direction, current, candidate, closest);
}
}
bool FocusController::advanceFocusDirectionallyInContainer(Node* container, const LayoutRect& startingRect, FocusDirection direction, KeyboardEvent* event)
{
if (!container || !container->document())
return false;
LayoutRect newStartingRect = startingRect;
if (startingRect.isEmpty())
newStartingRect = virtualRectForDirection(direction, nodeRectInAbsoluteCoordinates(container));
FocusCandidate focusCandidate;
findFocusCandidateInContainer(container, newStartingRect, direction, event, focusCandidate);
if (focusCandidate.isNull()) {
return scrollInDirection(container, direction);
}
if (HTMLFrameOwnerElement* frameElement = frameOwnerElement(focusCandidate)) {
ASSERT(frameElement->contentFrame());
if (focusCandidate.isOffscreenAfterScrolling) {
scrollInDirection(focusCandidate.visibleNode->document(), direction);
return true;
}
LayoutRect rect;
Element* focusedElement = focusedOrMainFrame()->document()->focusedElement();
if (focusedElement && !hasOffscreenRect(focusedElement))
rect = nodeRectInAbsoluteCoordinates(focusedElement, true );
frameElement->contentFrame()->document()->updateLayoutIgnorePendingStylesheets();
if (!advanceFocusDirectionallyInContainer(frameElement->contentFrame()->document(), rect, direction, event)) {
return advanceFocusDirectionallyInContainer(container, nodeRectInAbsoluteCoordinates(focusCandidate.visibleNode, true), direction, event);
}
return true;
}
if (canScrollInDirection(focusCandidate.visibleNode, direction)) {
if (focusCandidate.isOffscreenAfterScrolling) {
scrollInDirection(focusCandidate.visibleNode, direction);
return true;
}
LayoutRect startingRect;
Element* focusedElement = focusedOrMainFrame()->document()->focusedElement();
if (focusedElement && !hasOffscreenRect(focusedElement))
startingRect = nodeRectInAbsoluteCoordinates(focusedElement, true);
return advanceFocusDirectionallyInContainer(focusCandidate.visibleNode, startingRect, direction, event);
}
if (focusCandidate.isOffscreenAfterScrolling) {
Node* container = focusCandidate.enclosingScrollableBox;
scrollInDirection(container, direction);
return true;
}
Element* element = toElement(focusCandidate.focusableNode);
ASSERT(element);
element->focus(false, direction);
return true;
}
bool FocusController::advanceFocusDirectionally(FocusDirection direction, KeyboardEvent* event)
{
Frame* curFrame = focusedOrMainFrame();
ASSERT(curFrame);
Document* focusedDocument = curFrame->document();
if (!focusedDocument)
return false;
Element* focusedElement = focusedDocument->focusedElement();
Node* container = focusedDocument;
if (container->isDocumentNode())
toDocument(container)->updateLayoutIgnorePendingStylesheets();
LayoutRect startingRect;
if (focusedElement) {
if (!hasOffscreenRect(focusedElement)) {
container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, focusedElement);
startingRect = nodeRectInAbsoluteCoordinates(focusedElement, true );
} else if (focusedElement->hasTagName(areaTag)) {
HTMLAreaElement* area = static_cast<HTMLAreaElement*>(focusedElement);
container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, area->imageElement());
startingRect = virtualRectForAreaElementAndDirection(area, direction);
}
}
bool consumed = false;
do {
consumed = advanceFocusDirectionallyInContainer(container, startingRect, direction, event);
startingRect = nodeRectInAbsoluteCoordinates(container, true );
container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(direction, container);
if (container && container->isDocumentNode())
toDocument(container)->updateLayoutIgnorePendingStylesheets();
} while (!consumed && container);
return consumed;
}
}