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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      4  * Copyright (C) 2012 Google Inc. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     22  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef ScopedStyleResolver_h
     28 #define ScopedStyleResolver_h
     29 
     30 #include "core/css/ElementRuleCollector.h"
     31 #include "core/css/RuleSet.h"
     32 #include "core/dom/TreeScope.h"
     33 #include "wtf/HashMap.h"
     34 #include "wtf/HashSet.h"
     35 #include "wtf/OwnPtr.h"
     36 #include "wtf/PassOwnPtr.h"
     37 
     38 namespace blink {
     39 
     40 class MediaQueryEvaluator;
     41 class PageRuleCollector;
     42 class StyleResolver;
     43 class StyleSheetContents;
     44 
     45 // This class selects a RenderStyle for a given element based on a collection of stylesheets.
     46 class ScopedStyleResolver FINAL : public NoBaseWillBeGarbageCollected<ScopedStyleResolver> {
     47     WTF_MAKE_NONCOPYABLE(ScopedStyleResolver);
     48     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     49 public:
     50     static PassOwnPtrWillBeRawPtr<ScopedStyleResolver> create(TreeScope& scope)
     51     {
     52         return adoptPtrWillBeNoop(new ScopedStyleResolver(scope));
     53     }
     54 
     55     static TreeScope* treeScopeFor(Document&, const CSSStyleSheet*);
     56 
     57     const TreeScope& treeScope() const { return *m_scope; }
     58     ScopedStyleResolver* parent() const;
     59 
     60 public:
     61     const StyleRuleKeyframes* keyframeStylesForAnimation(const StringImpl* animationName);
     62     void addKeyframeStyle(PassRefPtrWillBeRawPtr<StyleRuleKeyframes>);
     63 
     64     void collectMatchingAuthorRules(ElementRuleCollector&, bool includeEmptyRules, CascadeScope, CascadeOrder = ignoreCascadeOrder);
     65     void matchPageRules(PageRuleCollector&);
     66     void addRulesFromSheet(CSSStyleSheet*, const MediaQueryEvaluator&, StyleResolver*);
     67     void collectFeaturesTo(RuleFeatureSet&, HashSet<const StyleSheetContents*>& visitedSharedStyleSheetContents) const;
     68     void resetAuthorStyle();
     69     void collectViewportRulesTo(StyleResolver*) const;
     70 
     71     void trace(Visitor*);
     72 
     73 private:
     74     explicit ScopedStyleResolver(TreeScope& scope)
     75         : m_scope(scope)
     76     {
     77     }
     78 
     79     RawPtrWillBeMember<TreeScope> m_scope;
     80 
     81     WillBeHeapVector<RawPtrWillBeMember<CSSStyleSheet> > m_authorStyleSheets;
     82 
     83     typedef WillBeHeapHashMap<const StringImpl*, RefPtrWillBeMember<StyleRuleKeyframes> > KeyframesRuleMap;
     84     KeyframesRuleMap m_keyframesRuleMap;
     85 };
     86 
     87 } // namespace blink
     88 
     89 #endif // ScopedStyleResolver_h
     90