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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/css/invalidation/StyleInvalidator.h"
#include "core/css/invalidation/DescendantInvalidationSet.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/ElementTraversal.h"
#include "core/dom/shadow/ElementShadow.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/rendering/RenderObject.h"
namespace WebCore {
void StyleInvalidator::invalidate(Document& document)
{
if (Element* documentElement = document.documentElement())
invalidate(*documentElement);
document.clearChildNeedsStyleInvalidation();
document.clearNeedsStyleInvalidation();
clearPendingInvalidations();
}
void StyleInvalidator::scheduleInvalidation(PassRefPtr<DescendantInvalidationSet> invalidationSet, Element& element)
{
InvalidationList& list = ensurePendingInvalidationList(element);
// If we're already going to invalidate the whole subtree we don't need to store any new sets.
if (!list.isEmpty() && list.last()->wholeSubtreeInvalid())
return;
// If this set would invalidate the whole subtree we can discard all existing sets.
if (invalidationSet->wholeSubtreeInvalid())
list.clear();
list.append(invalidationSet);
element.setNeedsStyleInvalidation();
}
StyleInvalidator::InvalidationList& StyleInvalidator::ensurePendingInvalidationList(Element& element)
{
PendingInvalidationMap::AddResult addResult = m_pendingInvalidationMap.add(&element, nullptr);
if (addResult.isNewEntry)
addResult.storedValue->value = adoptPtr(new InvalidationList);
return *addResult.storedValue->value;
}
void StyleInvalidator::clearInvalidation(Node& node)
{
if (node.isElementNode() && node.needsStyleInvalidation())
m_pendingInvalidationMap.remove(toElement(&node));
node.clearChildNeedsStyleInvalidation();
node.clearNeedsStyleInvalidation();
}
void StyleInvalidator::clearPendingInvalidations()
{
m_pendingInvalidationMap.clear();
}
StyleInvalidator::StyleInvalidator()
{
}
StyleInvalidator::~StyleInvalidator()
{
}
void StyleInvalidator::RecursionData::pushInvalidationSet(const DescendantInvalidationSet& invalidationSet)
{
ASSERT(!m_wholeSubtreeInvalid);
if (invalidationSet.wholeSubtreeInvalid()) {
m_wholeSubtreeInvalid = true;
return;
}
m_invalidationSets.append(&invalidationSet);
m_invalidateCustomPseudo = invalidationSet.customPseudoInvalid();
}
bool StyleInvalidator::RecursionData::matchesCurrentInvalidationSets(Element& element)
{
ASSERT(!m_wholeSubtreeInvalid);
if (m_invalidateCustomPseudo && element.shadowPseudoId() != nullAtom)
return true;
for (InvalidationSets::iterator it = m_invalidationSets.begin(); it != m_invalidationSets.end(); ++it) {
if ((*it)->invalidatesElement(element))
return true;
}
return false;
}
bool StyleInvalidator::checkInvalidationSetsAgainstElement(Element& element)
{
if (m_recursionData.wholeSubtreeInvalid())
return true;
if (element.needsStyleInvalidation()) {
if (InvalidationList* invalidationList = m_pendingInvalidationMap.get(&element)) {
for (InvalidationList::const_iterator it = invalidationList->begin(); it != invalidationList->end(); ++it)
m_recursionData.pushInvalidationSet(**it);
// FIXME: It's really only necessary to clone the render style for this element, not full style recalc.
return true;
}
}
return m_recursionData.matchesCurrentInvalidationSets(element);
}
bool StyleInvalidator::invalidateChildren(Element& element)
{
bool someChildrenNeedStyleRecalc = false;
for (ShadowRoot* root = element.youngestShadowRoot(); root; root = root->olderShadowRoot()) {
for (Element* child = ElementTraversal::firstWithin(*root); child; child = ElementTraversal::nextSibling(*child)) {
bool childRecalced = invalidate(*child);
someChildrenNeedStyleRecalc = someChildrenNeedStyleRecalc || childRecalced;
}
root->clearChildNeedsStyleInvalidation();
root->clearNeedsStyleInvalidation();
}
for (Element* child = ElementTraversal::firstWithin(element); child; child = ElementTraversal::nextSibling(*child)) {
bool childRecalced = invalidate(*child);
someChildrenNeedStyleRecalc = someChildrenNeedStyleRecalc || childRecalced;
}
return someChildrenNeedStyleRecalc;
}
bool StyleInvalidator::invalidate(Element& element)
{
RecursionCheckpoint checkpoint(&m_recursionData);
bool thisElementNeedsStyleRecalc = checkInvalidationSetsAgainstElement(element);
bool someChildrenNeedStyleRecalc = false;
if (m_recursionData.hasInvalidationSets() || element.childNeedsStyleInvalidation())
someChildrenNeedStyleRecalc = invalidateChildren(element);
if (thisElementNeedsStyleRecalc) {
element.setNeedsStyleRecalc(m_recursionData.wholeSubtreeInvalid() ? SubtreeStyleChange : LocalStyleChange);
} else if (m_recursionData.hasInvalidationSets() && someChildrenNeedStyleRecalc) {
// Clone the RenderStyle in order to preserve correct style sharing, if possible. Otherwise recalc style.
if (RenderObject* renderer = element.renderer())
renderer->setStyleInternal(RenderStyle::clone(renderer->style()));
else
element.setNeedsStyleRecalc(LocalStyleChange);
}
element.clearChildNeedsStyleInvalidation();
element.clearNeedsStyleInvalidation();
return thisElementNeedsStyleRecalc;
}
} // namespace WebCore
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