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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  *           (C) 2006 Alexey Proskuryakov (ap (at) webkit.org)
      6  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
      7  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      8  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      9  * Copyright (C) 2013 Google Inc. All rights reserved.
     10  *
     11  * This library is free software; you can redistribute it and/or
     12  * modify it under the terms of the GNU Library General Public
     13  * License as published by the Free Software Foundation; either
     14  * version 2 of the License, or (at your option) any later version.
     15  *
     16  * This library is distributed in the hope that it will be useful,
     17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     19  * Library General Public License for more details.
     20  *
     21  * You should have received a copy of the GNU Library General Public License
     22  * along with this library; see the file COPYING.LIB.  If not, write to
     23  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     24  * Boston, MA 02110-1301, USA.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/dom/ShadowTreeStyleSheetCollection.h"
     29 
     30 #include "core/HTMLNames.h"
     31 #include "core/css/CSSStyleSheet.h"
     32 #include "core/css/resolver/StyleResolver.h"
     33 #include "core/dom/Element.h"
     34 #include "core/dom/StyleEngine.h"
     35 #include "core/dom/shadow/ShadowRoot.h"
     36 #include "core/html/HTMLStyleElement.h"
     37 
     38 namespace blink {
     39 
     40 using namespace HTMLNames;
     41 
     42 ShadowTreeStyleSheetCollection::ShadowTreeStyleSheetCollection(ShadowRoot& shadowRoot)
     43     : TreeScopeStyleSheetCollection(shadowRoot)
     44 {
     45 }
     46 
     47 void ShadowTreeStyleSheetCollection::collectStyleSheets(StyleEngine* engine, StyleSheetCollection& collection)
     48 {
     49     DocumentOrderedList::iterator begin = m_styleSheetCandidateNodes.begin();
     50     DocumentOrderedList::iterator end = m_styleSheetCandidateNodes.end();
     51     for (DocumentOrderedList::iterator it = begin; it != end; ++it) {
     52         Node* node = *it;
     53         StyleSheet* sheet = 0;
     54         CSSStyleSheet* activeSheet = 0;
     55 
     56         if (!isHTMLStyleElement(*node))
     57             continue;
     58 
     59         HTMLStyleElement* element = toHTMLStyleElement(node);
     60         const AtomicString& title = element->fastGetAttribute(titleAttr);
     61         bool enabledViaScript = false;
     62 
     63         sheet = element->sheet();
     64         if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet())
     65             activeSheet = toCSSStyleSheet(sheet);
     66 
     67         // FIXME: clarify how PREFERRED or ALTERNATE works in shadow trees.
     68         // Should we set preferred/selected stylesheets name in shadow trees and
     69         // use the name in document?
     70         if (!enabledViaScript && sheet && !title.isEmpty()) {
     71             if (engine->preferredStylesheetSetName().isEmpty()) {
     72                 engine->setPreferredStylesheetSetName(title);
     73                 engine->setSelectedStylesheetSetName(title);
     74             }
     75             if (title != engine->preferredStylesheetSetName())
     76                 activeSheet = 0;
     77         }
     78 
     79         const AtomicString& rel = element->fastGetAttribute(relAttr);
     80         if (rel.contains("alternate") && title.isEmpty())
     81             activeSheet = 0;
     82 
     83         if (sheet)
     84             collection.appendSheetForList(sheet);
     85         if (activeSheet)
     86             collection.appendActiveStyleSheet(activeSheet);
     87     }
     88 }
     89 
     90 void ShadowTreeStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine, StyleResolverUpdateMode updateMode)
     91 {
     92     StyleSheetCollection collection;
     93     collectStyleSheets(engine, collection);
     94 
     95     StyleSheetChange change;
     96     analyzeStyleSheetChange(updateMode, collection, change);
     97 
     98     if (StyleResolver* styleResolver = engine->resolver()) {
     99         if (change.styleResolverUpdateType != Additive) {
    100             // We should not destroy StyleResolver when we find any stylesheet update in a shadow tree.
    101             // In this case, we will reset rulesets created from style elements in the shadow tree.
    102             styleResolver->resetAuthorStyle(treeScope());
    103             styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
    104             styleResolver->lazyAppendAuthorStyleSheets(0, collection.activeAuthorStyleSheets());
    105         } else {
    106             styleResolver->lazyAppendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), collection.activeAuthorStyleSheets());
    107         }
    108     }
    109     if (change.requiresFullStyleRecalc)
    110         toShadowRoot(treeScope().rootNode()).host()->setNeedsStyleRecalc(SubtreeStyleChange);
    111 
    112     collection.swap(*this);
    113     updateUsesRemUnits();
    114 }
    115 
    116 }
    117