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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 SVGElementRareData_h
     21 #define SVGElementRareData_h
     22 
     23 #include "core/css/StylePropertySet.h"
     24 #include "core/css/resolver/StyleResolver.h"
     25 #include "wtf/HashSet.h"
     26 #include "wtf/Noncopyable.h"
     27 #include "wtf/StdLibExtras.h"
     28 
     29 namespace WebCore {
     30 
     31 class CSSCursorImageValue;
     32 class SVGCursorElement;
     33 class SVGElement;
     34 class SVGElementInstance;
     35 
     36 class SVGElementRareData {
     37     WTF_MAKE_NONCOPYABLE(SVGElementRareData); WTF_MAKE_FAST_ALLOCATED;
     38 public:
     39     SVGElementRareData()
     40         : m_cursorElement(0)
     41         , m_cursorImageValue(0)
     42         , m_correspondingElement(0)
     43         , m_instancesUpdatesBlocked(false)
     44         , m_useOverrideComputedStyle(false)
     45         , m_needsOverrideComputedStyleUpdate(false)
     46     {
     47     }
     48 
     49     typedef HashMap<const SVGElement*, SVGElementRareData*> SVGElementRareDataMap;
     50 
     51     static SVGElementRareDataMap& rareDataMap()
     52     {
     53         DEFINE_STATIC_LOCAL(SVGElementRareDataMap, rareDataMap, ());
     54         return rareDataMap;
     55     }
     56 
     57     static SVGElementRareData* rareDataFromMap(const SVGElement* element)
     58     {
     59         return rareDataMap().get(element);
     60     }
     61 
     62     HashSet<SVGElementInstance*>& elementInstances() { return m_elementInstances; }
     63     const HashSet<SVGElementInstance*>& elementInstances() const { return m_elementInstances; }
     64 
     65     bool instanceUpdatesBlocked() const { return m_instancesUpdatesBlocked; }
     66     void setInstanceUpdatesBlocked(bool value) { m_instancesUpdatesBlocked = value; }
     67 
     68     SVGCursorElement* cursorElement() const { return m_cursorElement; }
     69     void setCursorElement(SVGCursorElement* cursorElement) { m_cursorElement = cursorElement; }
     70 
     71     SVGElement* correspondingElement() { return m_correspondingElement; }
     72     void setCorrespondingElement(SVGElement* correspondingElement) { m_correspondingElement = correspondingElement; }
     73 
     74     CSSCursorImageValue* cursorImageValue() const { return m_cursorImageValue; }
     75     void setCursorImageValue(CSSCursorImageValue* cursorImageValue) { m_cursorImageValue = cursorImageValue; }
     76 
     77     MutableStylePropertySet* animatedSMILStyleProperties() const { return m_animatedSMILStyleProperties.get(); }
     78     MutableStylePropertySet* ensureAnimatedSMILStyleProperties()
     79     {
     80         if (!m_animatedSMILStyleProperties)
     81             m_animatedSMILStyleProperties = MutableStylePropertySet::create(SVGAttributeMode);
     82         return m_animatedSMILStyleProperties.get();
     83     }
     84 
     85     void destroyAnimatedSMILStyleProperties()
     86     {
     87         m_animatedSMILStyleProperties.clear();
     88     }
     89 
     90     RenderStyle* overrideComputedStyle(Element* element, RenderStyle* parentStyle)
     91     {
     92         ASSERT(element);
     93         if (!element->document() || !m_useOverrideComputedStyle)
     94             return 0;
     95         if (!m_overrideComputedStyle || m_needsOverrideComputedStyleUpdate) {
     96             // The style computed here contains no CSS Animations/Transitions or SMIL induced rules - this is needed to compute the "base value" for the SMIL animation sandwhich model.
     97             m_overrideComputedStyle = element->document()->styleResolver()->styleForElement(element, parentStyle, DisallowStyleSharing, MatchAllRulesExcludingSMIL);
     98             m_needsOverrideComputedStyleUpdate = false;
     99         }
    100         ASSERT(m_overrideComputedStyle);
    101         return m_overrideComputedStyle.get();
    102     }
    103 
    104     bool useOverrideComputedStyle() const { return m_useOverrideComputedStyle; }
    105     void setUseOverrideComputedStyle(bool value) { m_useOverrideComputedStyle = value; }
    106     void setNeedsOverrideComputedStyleUpdate() { m_needsOverrideComputedStyleUpdate = true; }
    107 
    108 private:
    109     HashSet<SVGElementInstance*> m_elementInstances;
    110     SVGCursorElement* m_cursorElement;
    111     CSSCursorImageValue* m_cursorImageValue;
    112     SVGElement* m_correspondingElement;
    113     bool m_instancesUpdatesBlocked : 1;
    114     bool m_useOverrideComputedStyle : 1;
    115     bool m_needsOverrideComputedStyleUpdate : 1;
    116     RefPtr<MutableStylePropertySet> m_animatedSMILStyleProperties;
    117     RefPtr<RenderStyle> m_overrideComputedStyle;
    118 };
    119 
    120 }
    121 
    122 #endif
    123