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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef Pair_h
     22 #define Pair_h
     23 
     24 #include "core/css/CSSPrimitiveValue.h"
     25 #include "wtf/PassRefPtr.h"
     26 #include "wtf/RefCounted.h"
     27 #include "wtf/text/StringBuilder.h"
     28 
     29 namespace WebCore {
     30 
     31 // A primitive value representing a pair.  This is useful for properties like border-radius, background-size/position,
     32 // and border-spacing (all of which are space-separated sets of two values).  At the moment we are only using it for
     33 // border-radius and background-size, but (FIXME) border-spacing and background-position could be converted over to use
     34 // it (eliminating some extra -webkit- internal properties).
     35 class Pair : public RefCounted<Pair> {
     36 public:
     37     static PassRefPtr<Pair> create()
     38     {
     39         return adoptRef(new Pair);
     40     }
     41     static PassRefPtr<Pair> create(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
     42     {
     43         return adoptRef(new Pair(first, second));
     44     }
     45     virtual ~Pair() { }
     46 
     47     CSSPrimitiveValue* first() const { return m_first.get(); }
     48     CSSPrimitiveValue* second() const { return m_second.get(); }
     49 
     50     void setFirst(PassRefPtr<CSSPrimitiveValue> first) { m_first = first; }
     51     void setSecond(PassRefPtr<CSSPrimitiveValue> second) { m_second = second; }
     52 
     53     String cssText() const
     54     {
     55 
     56         return generateCSSString(first()->cssText(), second()->cssText());
     57     }
     58 
     59     bool equals(const Pair& other) const { return compareCSSValuePtr(m_first, other.m_first) && compareCSSValuePtr(m_second, other.m_second); }
     60 
     61     String serializeResolvingVariables(const HashMap<AtomicString, String>& variables) const
     62     {
     63         return generateCSSString(first()->customSerializeResolvingVariables(variables),
     64                                  second()->customSerializeResolvingVariables(variables));
     65     }
     66 
     67     bool hasVariableReference() const { return first()->hasVariableReference() || second()->hasVariableReference(); }
     68 
     69 private:
     70     Pair() : m_first(0), m_second(0) { }
     71     Pair(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
     72         : m_first(first), m_second(second) { }
     73 
     74     static String generateCSSString(const String& first, const String& second)
     75     {
     76         if (first == second)
     77             return first;
     78         return first + ' ' + second;
     79     }
     80 
     81     RefPtr<CSSPrimitiveValue> m_first;
     82     RefPtr<CSSPrimitiveValue> m_second;
     83 };
     84 
     85 } // namespace
     86 
     87 #endif
     88