bool HTMLEmbedElement::rendererIsNeeded(const NodeRenderingContext& context)
{
if (isImageType())
return HTMLPlugInImageElement::rendererIsNeeded(context);
Frame* frame = document()->frame();
if (!frame)
return false;
// If my parent is an <object> and is not set to use fallback content, I
// should be ignored and not get a renderer.
ContainerNode* p = parentNode();
if (p && p->hasTagName(objectTag)) {
ASSERT(p->renderer());
if (!static_cast<HTMLObjectElement*>(p)->useFallbackContent()) {
ASSERT(!p->renderer()->isEmbeddedObject());
return false;
}
}
#if ENABLE(DASHBOARD_SUPPORT)
// Workaround for <rdar://problem/6642221>.
if (Settings* settings = frame->settings()) {
if (settings->usesDashboardBackwardCompatibilityMode())
return true;
}
#endif
return HTMLPlugInImageElement::rendererIsNeeded(context);
}
void Text::reattachIfNeeded(const AttachContext& context)
{
bool rendererIsNeeded = false;
ContainerNode* renderingParent = NodeRenderingTraversal::parent(*this);
if (renderingParent) {
if (RenderObject* parentRenderer = renderingParent->renderer()) {
if (textRendererIsNeeded(*parentRenderer->style(), *parentRenderer))
rendererIsNeeded = true;
}
}
if (rendererIsNeeded == !!renderer())
return;
// The following is almost the same as Node::reattach() except that we create renderer only if needed.
// Not calling reattach() to avoid repeated calls to Text::textRendererIsNeeded().
AttachContext reattachContext(context);
reattachContext.performingReattach = true;
if (styleChangeType() < NeedsReattachStyleChange)
detach(reattachContext);
if (rendererIsNeeded)
RenderTreeBuilderForText(*this, renderingParent->renderer()).createRenderer();
CharacterData::attach(reattachContext);
}
bool HTMLEmbedElement::rendererIsNeeded(const RenderStyle& style)
{
if (isImageType())
return HTMLPlugInImageElement::rendererIsNeeded(style);
// If my parent is an <object> and is not set to use fallback content, I
// should be ignored and not get a renderer.
ContainerNode* p = parentNode();
if (p && p->hasTagName(objectTag)) {
if (!p->renderer())
return false;
if (!toHTMLObjectElement(p)->useFallbackContent()) {
ASSERT(!p->renderer()->isEmbeddedObject());
return false;
}
}
#if ENABLE(DASHBOARD_SUPPORT)
// Workaround for <rdar://problem/6642221>.
if (document().frame()->settings().usesDashboardBackwardCompatibilityMode())
return true;
#endif
return HTMLPlugInImageElement::rendererIsNeeded(style);
}
void SimplifyMarkupCommand::doApply()
{
ContainerNode* rootNode = m_firstNode->parentNode();
WillBeHeapVector<RefPtrWillBeMember<ContainerNode>> nodesToRemove;
// Walk through the inserted nodes, to see if there are elements that could be removed
// without affecting the style. The goal is to produce leaner markup even when starting
// from a verbose fragment.
// We look at inline elements as well as non top level divs that don't have attributes.
for (Node* node = m_firstNode.get(); node && node != m_nodeAfterLast; node = NodeTraversal::next(*node)) {
if (node->hasChildren() || (node->isTextNode() && node->nextSibling()))
continue;
ContainerNode* startingNode = node->parentNode();
if (!startingNode)
continue;
RenderStyle* startingStyle = startingNode->renderStyle();
if (!startingStyle)
continue;
ContainerNode* currentNode = startingNode;
ContainerNode* topNodeWithStartingStyle = nullptr;
while (currentNode != rootNode) {
if (currentNode->parentNode() != rootNode && isRemovableBlock(currentNode))
nodesToRemove.append(currentNode);
currentNode = currentNode->parentNode();
if (!currentNode)
break;
if (!currentNode->renderer() || !currentNode->renderer()->isRenderInline() || toRenderInline(currentNode->renderer())->alwaysCreateLineBoxes())
continue;
if (currentNode->firstChild() != currentNode->lastChild()) {
topNodeWithStartingStyle = 0;
break;
}
if (!currentNode->renderStyle()->visualInvalidationDiff(*startingStyle).hasDifference())
topNodeWithStartingStyle = currentNode;
}
if (topNodeWithStartingStyle) {
for (ContainerNode* node = startingNode; node != topNodeWithStartingStyle; node = node->parentNode())
nodesToRemove.append(node);
}
}
// we perform all the DOM mutations at once.
for (size_t i = 0; i < nodesToRemove.size(); ++i) {
// FIXME: We can do better by directly moving children from nodesToRemove[i].
int numPrunedAncestors = pruneSubsequentAncestorsToRemove(nodesToRemove, i);
if (numPrunedAncestors < 0)
continue;
removeNodePreservingChildren(nodesToRemove[i], AssumeContentIsAlwaysEditable);
i += numPrunedAncestors;
}
}
void RemoveNodeCommand::doApply()
{
ContainerNode* parent = m_node->parentNode();
if (!parent || (m_shouldAssumeContentIsAlwaysEditable == DoNotAssumeContentIsAlwaysEditable
&& !parent->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable) && parent->renderer()))
return;
ASSERT(parent->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable) || !parent->renderer());
m_parent = parent;
m_refChild = m_node->nextSibling();
m_node->remove(IGNORE_EXCEPTION);
}
void SVGFELightElement::svgAttributeChanged(const QualifiedName& attrName)
{
SVGElement::svgAttributeChanged(attrName);
if (attrName == SVGNames::azimuthAttr
|| attrName == SVGNames::elevationAttr
|| attrName == SVGNames::xAttr
|| attrName == SVGNames::yAttr
|| attrName == SVGNames::zAttr
|| attrName == SVGNames::pointsAtXAttr
|| attrName == SVGNames::pointsAtYAttr
|| attrName == SVGNames::pointsAtZAttr
|| attrName == SVGNames::specularExponentAttr
|| attrName == SVGNames::limitingConeAngleAttr) {
ContainerNode* parent = parentNode();
if (!parent)
return;
RenderObject* renderer = parent->renderer();
if (!renderer || !renderer->isSVGResourceFilterPrimitive())
return;
if (parent->hasTagName(SVGNames::feDiffuseLightingTag)) {
SVGFEDiffuseLightingElement* diffuseLighting = static_cast<SVGFEDiffuseLightingElement*>(parent);
diffuseLighting->lightElementAttributeChanged(this, attrName);
return;
}
// Handler for SpecularLighting has not implemented yet.
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
}
}
bool HTMLFormElement::rendererIsNeeded(const RenderStyle& style)
{
if (!m_wasDemoted)
return HTMLElement::rendererIsNeeded(style);
ContainerNode* node = parentNode();
RenderObject* parentRenderer = node->renderer();
// FIXME: Shouldn't we also check for table caption (see |formIsTablePart| below).
// FIXME: This check is not correct for Shadow DOM.
bool parentIsTableElementPart = (parentRenderer->isTable() && isHTMLTableElement(node))
|| (parentRenderer->isTableRow() && node->hasTagName(trTag))
|| (parentRenderer->isTableSection() && node->hasTagName(tbodyTag))
|| (parentRenderer->isRenderTableCol() && node->hasTagName(colTag))
|| (parentRenderer->isTableCell() && node->hasTagName(trTag));
if (!parentIsTableElementPart)
return true;
EDisplay display = style.display();
bool formIsTablePart = display == TABLE || display == INLINE_TABLE || display == TABLE_ROW_GROUP
|| display == TABLE_HEADER_GROUP || display == TABLE_FOOTER_GROUP || display == TABLE_ROW
|| display == TABLE_COLUMN_GROUP || display == TABLE_COLUMN || display == TABLE_CELL
|| display == TABLE_CAPTION;
return formIsTablePart;
}
static void createRendererIfNeeded(Element& element, RenderStyle* resolvedStyle)
{
ASSERT(!element.renderer());
Document& document = element.document();
ContainerNode* renderingParentNode = NodeRenderingTraversal::parent(&element);
RefPtr<RenderStyle> style = resolvedStyle;
element.setIsInsideRegion(false);
if (!shouldCreateRenderer(element, renderingParentNode) && !elementInsideRegionNeedsRenderer(element, renderingParentNode, style))
return;
if (!style)
style = element.styleForRenderer();
RenderNamedFlowThread* parentFlowRenderer = 0;
#if ENABLE(CSS_REGIONS)
parentFlowRenderer = moveToFlowThreadIfNeeded(element, *style);
#endif
if (!element.rendererIsNeeded(*style))
return;
RenderObject* parentRenderer;
RenderObject* nextRenderer;
if (parentFlowRenderer) {
parentRenderer = parentFlowRenderer;
nextRenderer = parentFlowRenderer->nextRendererForNode(&element);
} else {
parentRenderer = renderingParentNode->renderer();
nextRenderer = nextSiblingRenderer(element, renderingParentNode);
}
RenderObject* newRenderer = element.createRenderer(document.renderArena(), style.get());
if (!newRenderer)
return;
if (!parentRenderer->isChildAllowed(newRenderer, style.get())) {
newRenderer->destroy();
return;
}
// Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
// for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
element.setRenderer(newRenderer);
newRenderer->setAnimatableStyle(style.release()); // setAnimatableStyle() can depend on renderer() already being set.
#if ENABLE(FULLSCREEN_API)
if (document.webkitIsFullScreen() && document.webkitCurrentFullScreenElement() == &element) {
newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, &document);
if (!newRenderer)
return;
}
#endif
// Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer.
parentRenderer->addChild(newRenderer, nextRenderer);
}
void RenderTreeUpdater::updateRenderTree(ContainerNode& root)
{
ASSERT(root.renderer());
ASSERT(m_parentStack.isEmpty());
m_parentStack.append(Parent(root));
auto descendants = composedTreeDescendants(root);
auto it = descendants.begin();
auto end = descendants.end();
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=156172
it.dropAssertions();
while (it != end) {
popParentsToDepth(it.depth());
auto& node = *it;
if (auto* renderer = node.renderer())
renderTreePosition().invalidateNextSibling(*renderer);
if (is<Text>(node)) {
auto& text = downcast<Text>(node);
if (parent().styleChange == Style::Detach || m_styleUpdate->textUpdate(text) || m_invalidatedWhitespaceOnlyTextSiblings.contains(&text))
updateTextRenderer(text);
it.traverseNextSkippingChildren();
continue;
}
auto& element = downcast<Element>(node);
auto* elementUpdate = m_styleUpdate->elementUpdate(element);
if (!elementUpdate) {
it.traverseNextSkippingChildren();
continue;
}
updateElementRenderer(element, *elementUpdate);
bool mayHaveRenderedDescendants = element.renderer() || (element.hasDisplayContents() && shouldCreateRenderer(element, renderTreePosition().parent()));
if (!mayHaveRenderedDescendants) {
it.traverseNextSkippingChildren();
continue;
}
pushParent(element, elementUpdate ? elementUpdate->change : Style::NoChange);
it.traverseNext();
}
popParentsToDepth(0);
m_invalidatedWhitespaceOnlyTextSiblings.clear();
}
bool HTMLEmbedElement::rendererIsNeeded(const RenderStyle& style)
{
if (isImageType())
return HTMLPlugInImageElement::rendererIsNeeded(style);
Frame* frame = document().frame();
if (!frame)
return false;
// If my parent is an <object> and is not set to use fallback content, I
// should be ignored and not get a renderer.
ContainerNode* p = parentNode();
if (p && p->hasTagName(objectTag)) {
ASSERT(p->renderer());
if (!toHTMLObjectElement(p)->useFallbackContent()) {
ASSERT(!p->renderer()->isEmbeddedObject());
return false;
}
}
return HTMLPlugInImageElement::rendererIsNeeded(style);
}
void SVGFELightElement::childrenChanged(const ChildChange& change)
{
SVGElement::childrenChanged(change);
if (change.source == ChildChangeSourceParser)
return;
ContainerNode* parent = parentNode();
if (!parent)
return;
RenderElement* renderer = parent->renderer();
if (renderer && renderer->isSVGResourceFilterPrimitive())
RenderSVGResource::markForLayoutAndParentResourceInvalidation(*renderer);
}
void invalidateFilterPrimitiveParent(SVGElement* element)
{
if (!element)
return;
ContainerNode* parent = element->parentNode();
if (!parent)
return;
RenderElement* renderer = parent->renderer();
if (!renderer || !renderer->isSVGResourceFilterPrimitive())
return;
RenderSVGResource::markForLayoutAndParentResourceInvalidation(*renderer, false);
}
void SVGFEMergeNodeElement::svgAttributeChanged(const QualifiedName& attrName)
{
SVGElement::svgAttributeChanged(attrName);
if (attrName != SVGNames::inAttr)
return;
ContainerNode* parentNode = parent();
if (!parentNode)
return;
RenderObject* renderer = parentNode->renderer();
if (!renderer || !renderer->isSVGResourceFilterPrimitive())
return;
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
}
static void createTextRendererIfNeeded(Text& textNode)
{
ASSERT(!textNode.renderer());
ContainerNode* renderingParentNode = NodeRenderingTraversal::parent(&textNode);
if (!renderingParentNode)
return;
RenderObject* parentRenderer = renderingParentNode->renderer();
if (!parentRenderer || !parentRenderer->canHaveChildren())
return;
if (!renderingParentNode->childShouldCreateRenderer(&textNode))
return;
Document& document = textNode.document();
RefPtr<RenderStyle> style;
bool resetStyleInheritance = textNode.parentNode()->isShadowRoot() && toShadowRoot(textNode.parentNode())->resetStyleInheritance();
if (resetStyleInheritance)
style = document.ensureStyleResolver().defaultStyleForElement();
else
style = parentRenderer->style();
if (!textRendererIsNeeded(textNode, *parentRenderer, *style))
return;
RenderText* newRenderer = textNode.createTextRenderer(document.renderArena(), style.get());
if (!newRenderer)
return;
if (!parentRenderer->isChildAllowed(newRenderer, style.get())) {
newRenderer->destroy();
return;
}
// Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
// for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
RenderObject* nextRenderer = nextSiblingRenderer(textNode);
textNode.setRenderer(newRenderer);
// Parent takes care of the animations, no need to call setAnimatableStyle.
newRenderer->setStyle(style.release());
parentRenderer->addChild(newRenderer, nextRenderer);
Node* sibling = textNode.nextSibling();
if (sibling && !sibling->renderer() && sibling->attached())
createTextRenderersForSiblingsAfterAttachIfNeeded(sibling);
}
void SVGFELightElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (!isSupportedAttribute(attrName)) {
SVGElement::svgAttributeChanged(attrName);
return;
}
SVGElementInstance::InvalidationGuard invalidationGuard(this);
if (attrName == SVGNames::azimuthAttr
|| attrName == SVGNames::elevationAttr
|| attrName == SVGNames::xAttr
|| attrName == SVGNames::yAttr
|| attrName == SVGNames::zAttr
|| attrName == SVGNames::pointsAtXAttr
|| attrName == SVGNames::pointsAtYAttr
|| attrName == SVGNames::pointsAtZAttr
|| attrName == SVGNames::specularExponentAttr
|| attrName == SVGNames::limitingConeAngleAttr) {
ContainerNode* parent = parentNode();
if (!parent)
return;
RenderObject* renderer = parent->renderer();
if (!renderer || !renderer->isSVGResourceFilterPrimitive())
return;
if (parent->hasTagName(SVGNames::feDiffuseLightingTag)) {
SVGFEDiffuseLightingElement* diffuseLighting = static_cast<SVGFEDiffuseLightingElement*>(parent);
diffuseLighting->lightElementAttributeChanged(this, attrName);
return;
} else if (parent->hasTagName(SVGNames::feSpecularLightingTag)) {
SVGFESpecularLightingElement* specularLighting = static_cast<SVGFESpecularLightingElement*>(parent);
specularLighting->lightElementAttributeChanged(this, attrName);
return;
}
}
ASSERT_NOT_REACHED();
}
bool HTMLFormElement::rendererIsNeeded(RenderStyle* style)
{
if (!isDemoted())
return HTMLElement::rendererIsNeeded(style);
ContainerNode* node = parentNode();
RenderObject* parentRenderer = node->renderer();
bool parentIsTableElementPart = (parentRenderer->isTable() && node->hasTagName(tableTag))
|| (parentRenderer->isTableRow() && node->hasTagName(trTag))
|| (parentRenderer->isTableSection() && node->hasTagName(tbodyTag))
|| (parentRenderer->isTableCol() && node->hasTagName(colTag))
|| (parentRenderer->isTableCell() && node->hasTagName(trTag));
if (!parentIsTableElementPart)
return true;
EDisplay display = style->display();
bool formIsTablePart = display == TABLE || display == INLINE_TABLE || display == TABLE_ROW_GROUP
|| display == TABLE_HEADER_GROUP || display == TABLE_FOOTER_GROUP || display == TABLE_ROW
|| display == TABLE_COLUMN_GROUP || display == TABLE_COLUMN || display == TABLE_CELL
|| display == TABLE_CAPTION;
return formIsTablePart;
}
static bool isDeletableElement(const Node* node)
{
if (!node || !node->isHTMLElement() || !node->inDocument() || !node->rendererIsEditable())
return false;
// In general we want to only draw the UI around object of a certain area, but we still keep the min width/height to
// make sure we don't end up with very thin or very short elements getting the UI.
const int minimumArea = 2500;
const int minimumWidth = 48;
const int minimumHeight = 16;
const unsigned minimumVisibleBorders = 1;
RenderObject* renderer = node->renderer();
if (!renderer || !renderer->isBox())
return false;
// Disallow the body element since it isn't practical to delete, and the deletion UI would be clipped.
if (node->hasTagName(bodyTag))
return false;
// Disallow elements with any overflow clip, since the deletion UI would be clipped as well. <rdar://problem/6840161>
if (renderer->hasOverflowClip())
return false;
// Disallow Mail blockquotes since the deletion UI would get in the way of editing for these.
if (isMailBlockquote(node))
return false;
RenderBox* box = toRenderBox(renderer);
IntRect borderBoundingBox = box->borderBoundingBox();
if (borderBoundingBox.width() < minimumWidth || borderBoundingBox.height() < minimumHeight)
return false;
if ((borderBoundingBox.width() * borderBoundingBox.height()) < minimumArea)
return false;
if (renderer->isTable())
return true;
if (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(iframeTag))
return true;
if (renderer->isOutOfFlowPositioned())
return true;
if (renderer->isRenderBlock() && !renderer->isTableCell()) {
RenderStyle* style = renderer->style();
if (!style)
return false;
// Allow blocks that have background images
if (style->hasBackgroundImage()) {
for (const FillLayer* background = style->backgroundLayers(); background; background = background->next()) {
if (background->image() && background->image()->canRender(renderer, 1))
return true;
}
}
// Allow blocks with a minimum number of non-transparent borders
unsigned visibleBorders = style->borderTop().isVisible() + style->borderBottom().isVisible() + style->borderLeft().isVisible() + style->borderRight().isVisible();
if (visibleBorders >= minimumVisibleBorders)
return true;
// Allow blocks that have a different background from it's parent
ContainerNode* parentNode = node->parentNode();
if (!parentNode)
return false;
RenderObject* parentRenderer = parentNode->renderer();
if (!parentRenderer)
return false;
RenderStyle* parentStyle = parentRenderer->style();
if (!parentStyle)
return false;
if (renderer->hasBackground() && (!parentRenderer->hasBackground() || style->visitedDependentColor(CSSPropertyBackgroundColor) != parentStyle->visitedDependentColor(CSSPropertyBackgroundColor)))
return true;
}
return false;
}
Node* StyledMarkupAccumulator::traverseNodesForSerialization(Node* startNode, Node* pastEnd, NodeTraversalMode traversalMode)
{
const bool shouldEmit = traversalMode == EmitString;
Vector<Node*> ancestorsToClose;
Node* next;
Node* lastClosed = 0;
for (Node* n = startNode; n != pastEnd; n = next) {
// According to <rdar://problem/5730668>, it is possible for n to blow
// past pastEnd and become null here. This shouldn't be possible.
// This null check will prevent crashes (but create too much markup)
// and the ASSERT will hopefully lead us to understanding the problem.
ASSERT(n);
if (!n)
break;
next = NodeTraversal::next(n);
bool openedTag = false;
if (isBlock(n) && canHaveChildrenForEditing(n) && next == pastEnd)
// Don't write out empty block containers that aren't fully selected.
continue;
if (!n->renderer() && !enclosingNodeWithTag(firstPositionInOrBeforeNode(n), selectTag)) {
next = NodeTraversal::nextSkippingChildren(n);
// Don't skip over pastEnd.
if (pastEnd && pastEnd->isDescendantOf(n))
next = pastEnd;
} else {
// Add the node to the markup if we're not skipping the descendants
if (shouldEmit)
appendStartTag(n);
// If node has no children, close the tag now.
if (!n->childNodeCount()) {
if (shouldEmit)
appendEndTag(n);
lastClosed = n;
} else {
openedTag = true;
ancestorsToClose.append(n);
}
}
// If we didn't insert open tag and there's no more siblings or we're at the end of the traversal, take care of ancestors.
// FIXME: What happens if we just inserted open tag and reached the end?
if (!openedTag && (!n->nextSibling() || next == pastEnd)) {
// Close up the ancestors.
while (!ancestorsToClose.isEmpty()) {
Node* ancestor = ancestorsToClose.last();
if (next != pastEnd && next->isDescendantOf(ancestor))
break;
// Not at the end of the range, close ancestors up to sibling of next node.
if (shouldEmit)
appendEndTag(ancestor);
lastClosed = ancestor;
ancestorsToClose.removeLast();
}
// Surround the currently accumulated markup with markup for ancestors we never opened as we leave the subtree(s) rooted at those ancestors.
ContainerNode* nextParent = next ? next->parentNode() : 0;
if (next != pastEnd && n != nextParent) {
Node* lastAncestorClosedOrSelf = n->isDescendantOf(lastClosed) ? lastClosed : n;
for (ContainerNode* parent = lastAncestorClosedOrSelf->parentNode(); parent && parent != nextParent; parent = parent->parentNode()) {
// All ancestors that aren't in the ancestorsToClose list should either be a) unrendered:
if (!parent->renderer())
continue;
// or b) ancestors that we never encountered during a pre-order traversal starting at startNode:
ASSERT(startNode->isDescendantOf(parent));
if (shouldEmit)
wrapWithNode(parent);
lastClosed = parent;
}
}
}
}
return lastClosed;
}
RenderTreeUpdater::Parent::Parent(ContainerNode& root)
: element(is<Document>(root) ? nullptr : downcast<Element>(&root))
, renderTreePosition(RenderTreePosition(*root.renderer()))
{
}
