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