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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) 2011 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 
     28 #ifndef TreeScopeStyleSheetCollection_h
     29 #define TreeScopeStyleSheetCollection_h
     30 
     31 #include "core/dom/Document.h"
     32 #include "core/dom/DocumentOrderedList.h"
     33 #include "core/dom/StyleSheetCollection.h"
     34 #include "core/dom/StyleSheetScopingNodeList.h"
     35 #include "core/dom/TreeScope.h"
     36 #include "wtf/FastAllocBase.h"
     37 #include "wtf/HashMap.h"
     38 #include "wtf/ListHashSet.h"
     39 #include "wtf/RefPtr.h"
     40 #include "wtf/Vector.h"
     41 #include "wtf/text/WTFString.h"
     42 
     43 namespace WebCore {
     44 
     45 class ContainerNode;
     46 class DocumentStyleSheetCollector;
     47 class StyleEngine;
     48 class Node;
     49 class StyleSheetContents;
     50 class StyleSheetList;
     51 class StyleRuleFontFace;
     52 
     53 class TreeScopeStyleSheetCollection : public StyleSheetCollection {
     54 public:
     55     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     56     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode);
     57     bool hasStyleSheetCandidateNodes() const { return !m_styleSheetCandidateNodes.isEmpty(); }
     58 
     59     bool usesRemUnits() const { return m_usesRemUnits; }
     60 
     61     DocumentOrderedList& styleSheetCandidateNodes() { return m_styleSheetCandidateNodes; }
     62     DocumentOrderedList* scopingNodesForStyleScoped() { return m_scopingNodesForStyleScoped.scopingNodes(); }
     63     ListHashSet<Node*, 4>* scopingNodesRemoved() { return m_scopingNodesForStyleScoped.scopingNodesRemoved(); }
     64 
     65     void clearMediaQueryRuleSetStyleSheets();
     66     void enableExitTransitionStylesheets();
     67 
     68     virtual void trace(Visitor* visitor) OVERRIDE
     69     {
     70         StyleSheetCollection::trace(visitor);
     71     }
     72 
     73 protected:
     74     explicit TreeScopeStyleSheetCollection(TreeScope&);
     75 
     76     Document& document() const { return m_treeScope.document(); }
     77 
     78     enum StyleResolverUpdateType {
     79         Reconstruct,
     80         Reset,
     81         Additive
     82     };
     83 
     84     class StyleSheetChange {
     85         STACK_ALLOCATED();
     86     public:
     87         StyleResolverUpdateType styleResolverUpdateType;
     88         bool requiresFullStyleRecalc;
     89         WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> > fontFaceRulesToRemove;
     90 
     91         StyleSheetChange()
     92             : styleResolverUpdateType(Reconstruct)
     93             , requiresFullStyleRecalc(true) { }
     94     };
     95 
     96     void analyzeStyleSheetChange(StyleResolverUpdateMode, const StyleSheetCollection&, StyleSheetChange&);
     97     void resetAllRuleSetsInTreeScope(StyleResolver*);
     98     void updateUsesRemUnits();
     99 
    100 private:
    101     static StyleResolverUpdateType compareStyleSheets(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& oldStyleSheets, const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStylesheets, WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> >& addedSheets);
    102     bool activeLoadingStyleSheetLoaded(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStyleSheets);
    103 
    104 protected:
    105     TreeScope& m_treeScope;
    106     bool m_hadActiveLoadingStylesheet;
    107     bool m_usesRemUnits;
    108 
    109     DocumentOrderedList m_styleSheetCandidateNodes;
    110     StyleSheetScopingNodeList m_scopingNodesForStyleScoped;
    111 };
    112 
    113 }
    114 
    115 #endif
    116 
    117