Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

Source/core/css/resolver/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Opera Software ASA. 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.
@@ skipping 380 matching lines @@
     const MatchedPropertiesCacheItem* findFromMatchedPropertiesCache(unsigned hash, const MatchResult&);
     void addToMatchedPropertiesCache(const RenderStyle*, const RenderStyle* parentStyle, unsigned hash, const MatchResult&);
 
     // Every N additions to the matched declaration cache trigger a sweep where entries holding
     // the last reference to a style declaration are garbage collected.
     void sweepMatchedPropertiesCache(Timer<StyleResolver>*);
 
     bool classNamesAffectedByRules(const SpaceSplitString&) const;
     bool sharingCandidateHasIdenticalStyleAffectingAttributes(StyledElement*) const;
 
+    typedef void (RenderStyle::*NavDirSetter)(StyleNavigationValue);
+    static NavDirSetter getNavDirSetterForProperty(CSSPropertyID);

[esprehn, 2013/06/20 19:45:10]

I'm not a fan of this pattern. Why do you need to return a function pointer like
this?

The naming of this method is also wrong. setterForNavigationDirection() matches
the convention.

[Krzysztof Olczyk, 2013/07/22 14:14:16]

Done.

+
     unsigned m_matchedPropertiesCacheAdditionsSinceLastSweep;
 
     typedef HashMap<unsigned, MatchedPropertiesCacheItem> MatchedPropertiesCache;
     MatchedPropertiesCache m_matchedPropertiesCache;
 
     Timer<StyleResolver> m_matchedPropertiesCacheSweepTimer;
 
     OwnPtr<MediaQueryEvaluator> m_medium;
     RefPtr<RenderStyle> m_rootDefaultStyle;
 
@@ skipping 57 matching lines @@
         PseudoId ignoreDynamicPseudo = NOPSEUDO;
         if (selectorChecker.match(selectorCheckingContext, ignoreDynamicPseudo, DOMSiblingTraversalStrategy()) == SelectorChecker::SelectorMatches)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolver_h