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1 /*
2  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public License
15  * along with this library; see the file COPYING.LIB.  If not, write to
16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  */
19 
20 #ifndef SVGPropertyTearOff_h
21 #define SVGPropertyTearOff_h
22 
23 #if ENABLE(SVG)
24 #include "SVGAnimatedProperty.h"
25 #include "SVGElement.h"
26 #include "SVGProperty.h"
27 
28 namespace WebCore {
29 
30 template<typename PropertyType>
31 class SVGPropertyTearOff : public SVGProperty {
32 public:
33     typedef SVGPropertyTearOff<PropertyType> Self;
34 
35     // Used for child types (baseVal/animVal) of a SVGAnimated* property (for example: SVGAnimatedLength::baseVal()).
36     // Also used for list tear offs (for example: text.x.baseVal.getItem(0)).
create(SVGAnimatedProperty * animatedProperty,SVGPropertyRole role,PropertyType & value)37     static PassRefPtr<Self> create(SVGAnimatedProperty* animatedProperty, SVGPropertyRole role, PropertyType& value)
38     {
39         ASSERT(animatedProperty);
40         return adoptRef(new Self(animatedProperty, role, value));
41     }
42 
43     // Used for non-animated POD types (for example: SVGSVGElement::createSVGLength()).
create(const PropertyType & initialValue)44     static PassRefPtr<Self> create(const PropertyType& initialValue)
45     {
46         return adoptRef(new Self(initialValue));
47     }
48 
propertyReference()49     PropertyType& propertyReference() { return *m_value; }
animatedProperty()50     SVGAnimatedProperty* animatedProperty() const { return m_animatedProperty.get(); }
51 
52     // Used only by the list tear offs!
setValue(PropertyType & value)53     void setValue(PropertyType& value)
54     {
55         if (m_valueIsCopy)
56             delete m_value;
57         m_valueIsCopy = false;
58         m_value = &value;
59     }
60 
setAnimatedProperty(SVGAnimatedProperty * animatedProperty)61     void setAnimatedProperty(SVGAnimatedProperty* animatedProperty) { m_animatedProperty = animatedProperty; }
62 
contextElement()63     SVGElement* contextElement() const
64     {
65         if (!m_animatedProperty || m_valueIsCopy)
66             return 0;
67         return m_animatedProperty->contextElement();
68     }
69 
detachWrapper()70     void detachWrapper()
71     {
72         if (m_valueIsCopy)
73             return;
74 
75         // Switch from a live value, to a non-live value.
76         // For example: <text x="50"/>
77         // var item = text.x.baseVal.getItem(0);
78         // text.setAttribute("x", "100");
79         // item.value still has to report '50' and it has to be possible to modify 'item'
80         // w/o changing the "new item" (with x=100) in the text element.
81         // Whenever the XML DOM modifies the "x" attribute, all existing wrappers are detached, using this function.
82         m_value = new PropertyType(*m_value);
83         m_valueIsCopy = true;
84         m_animatedProperty = 0;
85     }
86 
commitChange()87     virtual void commitChange()
88     {
89         if (!m_animatedProperty || m_valueIsCopy)
90             return;
91         m_animatedProperty->commitChange();
92     }
93 
role()94     virtual SVGPropertyRole role() const { return m_role; }
95 
96 protected:
SVGPropertyTearOff(SVGAnimatedProperty * animatedProperty,SVGPropertyRole role,PropertyType & value)97     SVGPropertyTearOff(SVGAnimatedProperty* animatedProperty, SVGPropertyRole role, PropertyType& value)
98         : m_animatedProperty(animatedProperty)
99         , m_role(role)
100         , m_value(&value)
101         , m_valueIsCopy(false)
102     {
103         // Using operator & is completly fine, as SVGAnimatedProperty owns this reference,
104         // and we're guaranteed to live as long as SVGAnimatedProperty does.
105     }
106 
SVGPropertyTearOff(const PropertyType & initialValue)107     SVGPropertyTearOff(const PropertyType& initialValue)
108         : m_animatedProperty(0)
109         , m_role(UndefinedRole)
110         , m_value(new PropertyType(initialValue))
111         , m_valueIsCopy(true)
112     {
113     }
114 
~SVGPropertyTearOff()115     virtual ~SVGPropertyTearOff()
116     {
117         if (m_valueIsCopy)
118             delete m_value;
119     }
120 
121     RefPtr<SVGAnimatedProperty> m_animatedProperty;
122     SVGPropertyRole m_role;
123     PropertyType* m_value;
124     bool m_valueIsCopy : 1;
125 };
126 
127 }
128 
129 #endif // ENABLE(SVG)
130 #endif // SVGPropertyTearOff_h
131