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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "core/dom/TreeScopeStyleSheetCollection.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/StyleRuleImport.h"
#include "core/css/StyleSheetContents.h"
#include "core/css/invalidation/StyleSheetInvalidationAnalysis.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Element.h"
#include "core/dom/StyleEngine.h"
#include "core/html/HTMLLinkElement.h"
#include "core/html/HTMLStyleElement.h"
namespace blink {
TreeScopeStyleSheetCollection::TreeScopeStyleSheetCollection(TreeScope& treeScope)
: m_treeScope(treeScope)
, m_hadActiveLoadingStylesheet(false)
, m_usesRemUnits(false)
{
}
void TreeScopeStyleSheetCollection::addStyleSheetCandidateNode(Node* node, bool createdByParser)
{
if (!node->inDocument())
return;
// Until the <body> exists, we have no choice but to compare document positions,
// since styles outside of the body and head continue to be shunted into the head
// (and thus can shift to end up before dynamically added DOM content that is also
// outside the body).
if (createdByParser && document().body())
m_styleSheetCandidateNodes.parserAdd(node);
else
m_styleSheetCandidateNodes.add(node);
}
TreeScopeStyleSheetCollection::StyleResolverUpdateType TreeScopeStyleSheetCollection::compareStyleSheets(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& oldStyleSheets, const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStylesheets, WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> >& addedSheets)
{
unsigned newStyleSheetCount = newStylesheets.size();
unsigned oldStyleSheetCount = oldStyleSheets.size();
ASSERT(newStyleSheetCount >= oldStyleSheetCount);
if (!newStyleSheetCount)
return Reconstruct;
unsigned newIndex = 0;
for (unsigned oldIndex = 0; oldIndex < oldStyleSheetCount; ++oldIndex) {
while (oldStyleSheets[oldIndex] != newStylesheets[newIndex]) {
addedSheets.append(newStylesheets[newIndex]->contents());
if (++newIndex == newStyleSheetCount)
return Reconstruct;
}
if (++newIndex == newStyleSheetCount)
return Reconstruct;
}
bool hasInsertions = !addedSheets.isEmpty();
while (newIndex < newStyleSheetCount) {
addedSheets.append(newStylesheets[newIndex]->contents());
++newIndex;
}
// If all new sheets were added at the end of the list we can just add them to existing StyleResolver.
// If there were insertions we need to re-add all the stylesheets so rules are ordered correctly.
return hasInsertions ? Reset : Additive;
}
bool TreeScopeStyleSheetCollection::activeLoadingStyleSheetLoaded(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStyleSheets)
{
// StyleSheets of <style> elements that @import stylesheets are active but loading. We need to trigger a full recalc when such loads are done.
bool hasActiveLoadingStylesheet = false;
unsigned newStylesheetCount = newStyleSheets.size();
for (unsigned i = 0; i < newStylesheetCount; ++i) {
if (newStyleSheets[i]->isLoading())
hasActiveLoadingStylesheet = true;
}
if (m_hadActiveLoadingStylesheet && !hasActiveLoadingStylesheet) {
m_hadActiveLoadingStylesheet = false;
return true;
}
m_hadActiveLoadingStylesheet = hasActiveLoadingStylesheet;
return false;
}
static bool findFontFaceRulesFromStyleSheetContents(const WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> >& sheets, WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >& fontFaceRules)
{
bool hasFontFaceRule = false;
for (unsigned i = 0; i < sheets.size(); ++i) {
ASSERT(sheets[i]);
if (sheets[i]->hasFontFaceRule()) {
// FIXME: We don't need this for styles in shadow tree.
sheets[i]->findFontFaceRules(fontFaceRules);
hasFontFaceRule = true;
}
}
return hasFontFaceRule;
}
void TreeScopeStyleSheetCollection::analyzeStyleSheetChange(StyleResolverUpdateMode updateMode, const StyleSheetCollection& newCollection, StyleSheetChange& change)
{
if (activeLoadingStyleSheetLoaded(newCollection.activeAuthorStyleSheets()))
return;
if (updateMode != AnalyzedStyleUpdate)
return;
// Find out which stylesheets are new.
WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> > addedSheets;
if (m_activeAuthorStyleSheets.size() <= newCollection.activeAuthorStyleSheets().size()) {
change.styleResolverUpdateType = compareStyleSheets(m_activeAuthorStyleSheets, newCollection.activeAuthorStyleSheets(), addedSheets);
} else {
StyleResolverUpdateType updateType = compareStyleSheets(newCollection.activeAuthorStyleSheets(), m_activeAuthorStyleSheets, addedSheets);
if (updateType != Additive) {
change.styleResolverUpdateType = updateType;
} else {
change.styleResolverUpdateType = Reset;
// If @font-face is removed, needs full style recalc.
if (findFontFaceRulesFromStyleSheetContents(addedSheets, change.fontFaceRulesToRemove))
return;
}
}
// FIXME: If styleResolverUpdateType is Reconstruct, we should return early here since
// we need to recalc the whole document. It's wrong to use StyleSheetInvalidationAnalysis since
// it only looks at the addedSheets.
// No point in doing the analysis work if we're just going to recalc the whole document anyways.
// This needs to be done after the compareStyleSheets calls above to ensure we don't throw away
// the StyleResolver if we don't need to.
if (document().hasPendingForcedStyleRecalc())
return;
// If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs.
if (!document().body() || document().hasNodesWithPlaceholderStyle())
return;
StyleSheetInvalidationAnalysis invalidationAnalysis(addedSheets);
if (invalidationAnalysis.dirtiesAllStyle())
return;
invalidationAnalysis.invalidateStyle(document());
change.requiresFullStyleRecalc = false;
return;
}
void TreeScopeStyleSheetCollection::clearMediaQueryRuleSetStyleSheets()
{
for (size_t i = 0; i < m_activeAuthorStyleSheets.size(); ++i) {
StyleSheetContents* contents = m_activeAuthorStyleSheets[i]->contents();
if (contents->hasMediaQueries())
contents->clearRuleSet();
}
}
void TreeScopeStyleSheetCollection::setExitTransitionStyleshetsEnabled(bool enabled)
{
DocumentOrderedList::iterator begin = m_styleSheetCandidateNodes.begin();
DocumentOrderedList::iterator end = m_styleSheetCandidateNodes.end();
for (DocumentOrderedList::iterator it = begin; it != end; ++it) {
Node* node = *it;
if (isHTMLLinkElement(*node))
toHTMLLinkElement(node)->setEnabledIfExitTransitionStyle(enabled);
}
}
static bool styleSheetsUseRemUnits(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& sheets)
{
for (unsigned i = 0; i < sheets.size(); ++i) {
if (sheets[i]->contents()->usesRemUnits())
return true;
}
return false;
}
void TreeScopeStyleSheetCollection::updateUsesRemUnits()
{
m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets);
}
void TreeScopeStyleSheetCollection::trace(Visitor* visitor)
{
visitor->trace(m_treeScope);
visitor->trace(m_styleSheetCandidateNodes);
StyleSheetCollection::trace(visitor);
}
}
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