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      1 /*
      2  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      4  * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #if ENABLE(SVG)
     25 #include "SVGElementInstance.h"
     26 
     27 #include "ContainerNodeAlgorithms.h"
     28 #include "Event.h"
     29 #include "EventException.h"
     30 #include "EventListener.h"
     31 #include "EventNames.h"
     32 #include "FrameView.h"
     33 #include "SVGElementInstanceList.h"
     34 #include "SVGUseElement.h"
     35 
     36 #include <wtf/RefCountedLeakCounter.h>
     37 
     38 namespace WebCore {
     39 
     40 #ifndef NDEBUG
     41 static WTF::RefCountedLeakCounter instanceCounter("WebCoreSVGElementInstance");
     42 #endif
     43 
     44 SVGElementInstance::SVGElementInstance(SVGUseElement* correspondingUseElement, SVGUseElement* directUseElement, PassRefPtr<SVGElement> originalElement)
     45     : m_correspondingUseElement(correspondingUseElement)
     46     , m_directUseElement(directUseElement)
     47     , m_element(originalElement)
     48     , m_previousSibling(0)
     49     , m_nextSibling(0)
     50     , m_firstChild(0)
     51     , m_lastChild(0)
     52 {
     53     ASSERT(m_correspondingUseElement);
     54     ASSERT(m_element);
     55 
     56     // Register as instance for passed element.
     57     m_element->mapInstanceToElement(this);
     58 
     59 #ifndef NDEBUG
     60     instanceCounter.increment();
     61 #endif
     62 }
     63 
     64 SVGElementInstance::~SVGElementInstance()
     65 {
     66 #ifndef NDEBUG
     67     instanceCounter.decrement();
     68 #endif
     69 
     70     // Deregister as instance for passed element.
     71     m_element->removeInstanceMapping(this);
     72 
     73     removeAllChildrenInContainer<SVGElementInstance, SVGElementInstance>(this);
     74 }
     75 
     76 PassRefPtr<SVGElementInstanceList> SVGElementInstance::childNodes()
     77 {
     78     return SVGElementInstanceList::create(this);
     79 }
     80 
     81 void SVGElementInstance::setShadowTreeElement(SVGElement* element)
     82 {
     83     ASSERT(element);
     84     m_shadowTreeElement = element;
     85 }
     86 
     87 void SVGElementInstance::appendChild(PassRefPtr<SVGElementInstance> child)
     88 {
     89     appendChildToContainer<SVGElementInstance, SVGElementInstance>(child.get(), this);
     90 }
     91 
     92 void SVGElementInstance::invalidateAllInstancesOfElement(SVGElement* element)
     93 {
     94     if (!element || !element->inDocument())
     95         return;
     96 
     97     if (element->isStyled() && static_cast<SVGStyledElement*>(element)->instanceUpdatesBlocked())
     98         return;
     99 
    100     const HashSet<SVGElementInstance*>& set = element->instancesForElement();
    101     if (set.isEmpty())
    102         return;
    103 
    104     // Mark all use elements referencing 'element' for rebuilding
    105     const HashSet<SVGElementInstance*>::const_iterator end = set.end();
    106     for (HashSet<SVGElementInstance*>::const_iterator it = set.begin(); it != end; ++it) {
    107         ASSERT((*it)->correspondingElement() == element);
    108         if (SVGUseElement* element = (*it)->correspondingUseElement())
    109             element->invalidateShadowTree();
    110     }
    111 
    112     // Be sure to rebuild use trees, if needed
    113     element->document()->updateLayoutIgnorePendingStylesheets();
    114 }
    115 
    116 ScriptExecutionContext* SVGElementInstance::scriptExecutionContext() const
    117 {
    118     return m_element->document();
    119 }
    120 
    121 bool SVGElementInstance::addEventListener(const AtomicString& eventType, PassRefPtr<EventListener> listener, bool useCapture)
    122 {
    123     return m_element->addEventListener(eventType, listener, useCapture);
    124 }
    125 
    126 bool SVGElementInstance::removeEventListener(const AtomicString& eventType, EventListener* listener, bool useCapture)
    127 {
    128     return m_element->removeEventListener(eventType, listener, useCapture);
    129 }
    130 
    131 void SVGElementInstance::removeAllEventListeners()
    132 {
    133     m_element->removeAllEventListeners();
    134 }
    135 
    136 bool SVGElementInstance::dispatchEvent(PassRefPtr<Event> event)
    137 {
    138     SVGElement* element = shadowTreeElement();
    139     if (!element)
    140         return false;
    141 
    142     return element->dispatchEvent(event);
    143 }
    144 
    145 EventTargetData* SVGElementInstance::eventTargetData()
    146 {
    147     // EventTarget would use these methods if we were actually using its add/removeEventListener logic.
    148     // As we're forwarding those calls to the correspondingElement(), no one should ever call this function.
    149     ASSERT_NOT_REACHED();
    150     return 0;
    151 }
    152 
    153 EventTargetData* SVGElementInstance::ensureEventTargetData()
    154 {
    155     // EventTarget would use these methods if we were actually using its add/removeEventListener logic.
    156     // As we're forwarding those calls to the correspondingElement(), no one should ever call this function.
    157     ASSERT_NOT_REACHED();
    158     return 0;
    159 }
    160 
    161 }
    162 
    163 #endif
    164