void RenderTreeUpdater::updateElementRenderer(Element& element, const Style::ElementUpdate& update)
{
#if PLATFORM(IOS)
CheckForVisibilityChange checkForVisibilityChange(element);
#endif
bool shouldTearDownRenderers = update.change == Style::Detach && (element.renderer() || element.isNamedFlowContentElement());
if (shouldTearDownRenderers)
tearDownRenderers(element, TeardownType::KeepHoverAndActive);
bool hasDisplayContents = update.style->display() == CONTENTS;
if (hasDisplayContents != element.hasDisplayContents()) {
element.setHasDisplayContents(hasDisplayContents);
// Render tree position needs to be recomputed as rendering siblings may be found from the display:contents subtree.
renderTreePosition().invalidateNextSibling();
}
bool shouldCreateNewRenderer = !element.renderer() && !hasDisplayContents;
if (shouldCreateNewRenderer) {
if (element.hasCustomStyleResolveCallbacks())
element.willAttachRenderers();
createRenderer(element, RenderStyle::clone(*update.style));
invalidateWhitespaceOnlyTextSiblingsAfterAttachIfNeeded(element);
return;
}
if (!element.renderer())
return;
auto& renderer = *element.renderer();
if (update.recompositeLayer) {
renderer.setStyle(RenderStyle::clone(*update.style), StyleDifferenceRecompositeLayer);
return;
}
if (update.change == Style::NoChange) {
if (pseudoStyleCacheIsInvalid(&renderer, update.style.get())) {
renderer.setStyle(RenderStyle::clone(*update.style), StyleDifferenceEqual);
return;
}
return;
}
renderer.setStyle(RenderStyle::clone(*update.style), StyleDifferenceEqual);
}
void TreeResolver::resolveComposedTree()
{
ASSERT(m_parentStack.size() == 1);
ASSERT(m_scopeStack.size() == 1);
auto descendants = composedTreeDescendants(m_document);
auto it = descendants.begin();
auto end = descendants.end();
// FIXME: SVG <use> element may cause tree mutations during style recalc.
it.dropAssertions();
while (it != end) {
popParentsToDepth(it.depth());
auto& node = *it;
auto& parent = this->parent();
ASSERT(node.containingShadowRoot() == scope().shadowRoot);
ASSERT(node.parentElement() == parent.element || is<ShadowRoot>(node.parentNode()) || node.parentElement()->shadowRoot());
if (is<Text>(node)) {
auto& text = downcast<Text>(node);
if (text.styleChangeType() == ReconstructRenderTree && parent.change != Detach)
m_update->addText(text, parent.element);
text.clearNeedsStyleRecalc();
it.traverseNextSkippingChildren();
continue;
}
auto& element = downcast<Element>(node);
if (it.depth() > Settings::defaultMaximumRenderTreeDepth) {
resetStyleForNonRenderedDescendants(element);
element.clearChildNeedsStyleRecalc();
it.traverseNextSkippingChildren();
continue;
}
// FIXME: We should deal with this during style invalidation.
bool affectedByPreviousSibling = element.styleIsAffectedByPreviousSibling() && parent.elementNeedingStyleRecalcAffectsNextSiblingElementStyle;
if (element.needsStyleRecalc() || parent.elementNeedingStyleRecalcAffectsNextSiblingElementStyle)
parent.elementNeedingStyleRecalcAffectsNextSiblingElementStyle = element.affectsNextSiblingElementStyle();
bool shouldResolveForPseudoElement = shouldResolvePseudoElement(element.beforePseudoElement()) || shouldResolvePseudoElement(element.afterPseudoElement());
const RenderStyle* style;
Change change;
bool shouldResolve = parent.change >= Inherit || element.needsStyleRecalc() || shouldResolveForPseudoElement || affectedByPreviousSibling || element.hasDisplayContents();
if (shouldResolve) {
#if PLATFORM(IOS)
CheckForVisibilityChangeOnRecalcStyle checkForVisibilityChange(&element, element.renderStyle());
#endif
element.resetComputedStyle();
if (element.hasCustomStyleResolveCallbacks()) {
if (!element.willRecalcStyle(parent.change)) {
it.traverseNextSkippingChildren();
continue;
}
}
auto elementUpdate = resolveElement(element);
if (element.hasCustomStyleResolveCallbacks())
element.didRecalcStyle(elementUpdate.change);
style = elementUpdate.style.get();
change = elementUpdate.change;
if (affectedByPreviousSibling && change != Detach)
change = Force;
if (elementUpdate.style)
m_update->addElement(element, parent.element, WTFMove(elementUpdate));
element.clearNeedsStyleRecalc();
} else {
style = element.renderStyle();
change = NoChange;
}
if (!style) {
resetStyleForNonRenderedDescendants(element);
element.clearChildNeedsStyleRecalc();
}
bool shouldIterateChildren = style && (element.childNeedsStyleRecalc() || change != NoChange);
if (!shouldIterateChildren) {
it.traverseNextSkippingChildren();
continue;
}
pushParent(element, *style, change);
it.traverseNext();
}
popParentsToDepth(1);
}
void resolveTree(Element& current, Change change)
{
ASSERT(change != Detach);
if (current.hasCustomStyleResolveCallbacks()) {
if (!current.willRecalcStyle(change))
return;
}
ContainerNode* renderingParentNode = NodeRenderingTraversal::parent(¤t);
bool hasParentStyle = renderingParentNode && renderingParentNode->renderStyle();
bool hasDirectAdjacentRules = current.childrenAffectedByDirectAdjacentRules();
bool hasIndirectAdjacentRules = current.childrenAffectedByForwardPositionalRules();
#if PLATFORM(IOS)
CheckForVisibilityChangeOnRecalcStyle checkForVisibilityChange(current, current->renderStyle());
#endif
if (change > NoChange || current.needsStyleRecalc())
current.resetComputedStyle();
if (hasParentStyle && (change >= Inherit || current.needsStyleRecalc()))
change = resolveLocal(current, change);
if (change != Detach) {
StyleResolverParentPusher parentPusher(¤t);
RenderStyle* currentStyle = current.renderStyle();
if (ShadowRoot* shadowRoot = current.shadowRoot()) {
if (change >= Inherit || shadowRoot->childNeedsStyleRecalc() || shadowRoot->needsStyleRecalc()) {
parentPusher.push();
resolveShadowTree(shadowRoot, currentStyle, change);
}
}
current.updateBeforePseudoElement(change);
// FIXME: This check is good enough for :hover + foo, but it is not good enough for :hover + foo + bar.
// For now we will just worry about the common case, since it's a lot trickier to get the second case right
// without doing way too much re-resolution.
bool forceCheckOfNextElementSibling = false;
bool forceCheckOfAnyElementSibling = false;
for (Node* child = current.firstChild(); child; child = child->nextSibling()) {
if (child->isTextNode()) {
updateTextStyle(*toText(child), currentStyle, change);
continue;
}
if (!child->isElementNode())
continue;
Element* childElement = toElement(child);
bool childRulesChanged = childElement->needsStyleRecalc() && childElement->styleChangeType() == FullStyleChange;
if ((forceCheckOfNextElementSibling || forceCheckOfAnyElementSibling))
childElement->setNeedsStyleRecalc();
if (change >= Inherit || childElement->childNeedsStyleRecalc() || childElement->needsStyleRecalc()) {
parentPusher.push();
resolveTree(*childElement, change);
}
forceCheckOfNextElementSibling = childRulesChanged && hasDirectAdjacentRules;
forceCheckOfAnyElementSibling = forceCheckOfAnyElementSibling || (childRulesChanged && hasIndirectAdjacentRules);
}
current.updateAfterPseudoElement(change);
}
current.clearNeedsStyleRecalc();
current.clearChildNeedsStyleRecalc();
if (current.hasCustomStyleResolveCallbacks())
current.didRecalcStyle(change);
}
