| /* |
| * 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 "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) {} |
| |
| void TreeScopeStyleSheetCollection::addStyleSheetCandidateNode(Node& node) { |
| if (!node.isConnected()) |
| return; |
| |
| m_styleSheetCandidateNodes.add(&node); |
| } |
| |
| TreeScopeStyleSheetCollection::StyleResolverUpdateType |
| TreeScopeStyleSheetCollection::compareStyleSheets( |
| const HeapVector<Member<CSSStyleSheet>>& oldStyleSheets, |
| const HeapVector<Member<CSSStyleSheet>>& newStylesheets, |
| HeapVector<Member<StyleSheetContents>>& addedSheets) { |
| unsigned newStyleSheetCount = newStylesheets.size(); |
| unsigned oldStyleSheetCount = oldStyleSheets.size(); |
| DCHECK_GE(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 HeapVector<Member<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 HeapVector<Member<StyleSheetContents>>& sheets, |
| HeapVector<Member<const StyleRuleFontFace>>& fontFaceRules) { |
| bool hasFontFaceRule = false; |
| |
| for (unsigned i = 0; i < sheets.size(); ++i) { |
| DCHECK(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 HeapVector<Member<CSSStyleSheet>>& newActiveAuthorStyleSheets, |
| StyleSheetChange& change) { |
| if (activeLoadingStyleSheetLoaded(newActiveAuthorStyleSheets)) |
| return; |
| |
| if (updateMode != AnalyzedStyleUpdate) |
| return; |
| |
| // Find out which stylesheets are new. |
| HeapVector<Member<StyleSheetContents>> addedSheets; |
| if (m_activeAuthorStyleSheets.size() <= newActiveAuthorStyleSheets.size()) { |
| change.styleResolverUpdateType = compareStyleSheets( |
| m_activeAuthorStyleSheets, newActiveAuthorStyleSheets, addedSheets); |
| } else { |
| StyleResolverUpdateType updateType = compareStyleSheets( |
| newActiveAuthorStyleSheets, 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(*m_treeScope, |
| addedSheets); |
| if (invalidationAnalysis.dirtiesAllStyle()) |
| return; |
| invalidationAnalysis.invalidateStyle(); |
| 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(); |
| } |
| } |
| |
| DEFINE_TRACE(TreeScopeStyleSheetCollection) { |
| visitor->trace(m_treeScope); |
| visitor->trace(m_styleSheetCandidateNodes); |
| StyleSheetCollection::trace(visitor); |
| } |
| |
| } // namespace blink |