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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef SVGPropertyTearOff_h
     32 #define SVGPropertyTearOff_h
     33 
     34 #include "core/dom/QualifiedName.h"
     35 #include "core/svg/properties/SVGProperty.h"
     36 #include "wtf/RefCounted.h"
     37 
     38 namespace blink {
     39 
     40 enum PropertyIsAnimValType {
     41     PropertyIsNotAnimVal,
     42     PropertyIsAnimVal
     43 };
     44 
     45 class SVGPropertyTearOffBase : public RefCounted<SVGPropertyTearOffBase> {
     46 public:
     47     virtual ~SVGPropertyTearOffBase() { }
     48 
     49     PropertyIsAnimValType propertyIsAnimVal() const
     50     {
     51         return m_propertyIsAnimVal;
     52     }
     53 
     54     bool isAnimVal() const
     55     {
     56         return m_propertyIsAnimVal == PropertyIsAnimVal;
     57     }
     58 
     59     bool isReadOnlyProperty() const
     60     {
     61         return m_isReadOnlyProperty;
     62     }
     63 
     64     void setIsReadOnlyProperty()
     65     {
     66         m_isReadOnlyProperty = true;
     67     }
     68 
     69     bool isImmutable() const
     70     {
     71         return isReadOnlyProperty() || isAnimVal();
     72     }
     73 
     74     virtual void commitChange();
     75 
     76     SVGElement* contextElement()
     77     {
     78         return m_contextElement;
     79     }
     80 
     81     const QualifiedName& attributeName()
     82     {
     83         return m_attributeName;
     84     }
     85 
     86     void attachToSVGElementAttribute(SVGElement* contextElement, const QualifiedName& attributeName)
     87     {
     88         ASSERT(!isImmutable());
     89         ASSERT(contextElement);
     90         ASSERT(attributeName != QualifiedName::null());
     91         m_contextElement = contextElement;
     92         m_attributeName = attributeName;
     93     }
     94 
     95     virtual AnimatedPropertyType type() const = 0;
     96 
     97 protected:
     98     SVGPropertyTearOffBase(SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName = QualifiedName::null())
     99         : m_contextElement(contextElement)
    100         , m_propertyIsAnimVal(propertyIsAnimVal)
    101         , m_isReadOnlyProperty(false)
    102         , m_attributeName(attributeName)
    103     {
    104     }
    105 
    106 private:
    107     // These references are kept alive from V8 wrapper to prevent reference cycles
    108     SVGElement* m_contextElement;
    109 
    110     PropertyIsAnimValType m_propertyIsAnimVal;
    111     bool m_isReadOnlyProperty;
    112     QualifiedName m_attributeName;
    113 };
    114 
    115 template <typename Property>
    116 class SVGPropertyTearOff : public SVGPropertyTearOffBase {
    117 public:
    118     Property* target()
    119     {
    120         return m_target.get();
    121     }
    122 
    123     void setTarget(PassRefPtr<Property> target)
    124     {
    125         m_target = target;
    126     }
    127 
    128     virtual AnimatedPropertyType type() const OVERRIDE
    129     {
    130         return Property::classType();
    131     }
    132 
    133 protected:
    134     SVGPropertyTearOff(PassRefPtr<Property> target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName = QualifiedName::null())
    135         : SVGPropertyTearOffBase(contextElement, propertyIsAnimVal, attributeName)
    136         , m_target(target)
    137     {
    138         ASSERT(m_target);
    139     }
    140 
    141 private:
    142     RefPtr<Property> m_target;
    143 };
    144 
    145 }
    146 
    147 #endif // SVGPropertyTearOff_h
    148