/*

    Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>

    Copyright (C) Research In Motion Limited 2010. All rights reserved.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#include "config.h"

#if ENABLE(SVG)

#include "SVGElementInstance.h"

#include "ContainerNodeAlgorithms.h"

#include "Event.h"

#include "EventException.h"

#include "EventListener.h"

#include "EventNames.h"

#include "FrameView.h"

#include "SVGElementInstanceList.h"

#include "SVGUseElement.h"

#include <wtf/RefCountedLeakCounter.h>

namespace WebCore {

#ifndef NDEBUG

static WTF::RefCountedLeakCounter instanceCounter("WebCoreSVGElementInstance");

#endif

SVGElementInstance::SVGElementInstance(SVGUseElement* useElement, PassRefPtr<SVGElement> originalElement)

    : m_useElement(useElement)

    , m_element(originalElement)

    , m_previousSibling(0)

    , m_nextSibling(0)

    , m_firstChild(0)

    , m_lastChild(0)

{

    ASSERT(m_useElement);

    ASSERT(m_element);

    // Register as instance for passed element.

    m_element->mapInstanceToElement(this);

#ifndef NDEBUG

    instanceCounter.increment();

#endif

}

SVGElementInstance::~SVGElementInstance()

{

#ifndef NDEBUG

    instanceCounter.decrement();

#endif

    // Deregister as instance for passed element.

    m_element->removeInstanceMapping(this);

    removeAllChildrenInContainer<SVGElementInstance, SVGElementInstance>(this);

}

PassRefPtr<SVGElementInstanceList> SVGElementInstance::childNodes()

{

    return SVGElementInstanceList::create(this);

}

void SVGElementInstance::setShadowTreeElement(SVGElement* element)

{

    ASSERT(element);

    m_shadowTreeElement = element;

}

void SVGElementInstance::appendChild(PassRefPtr<SVGElementInstance> child)

{

    appendChildToContainer<SVGElementInstance, SVGElementInstance>(child.get(), this);

}

void SVGElementInstance::invalidateAllInstancesOfElement(SVGElement* element)

{

    if (!element || !element->inDocument())

        return;

    if (element->isStyled() && static_cast<SVGStyledElement*>(element)->instanceUpdatesBlocked())

        return;

    const HashSet<SVGElementInstance*>& set = element->instancesForElement();

    if (set.isEmpty())

        return;

    // Mark all use elements referencing 'element' for rebuilding

    const HashSet<SVGElementInstance*>::const_iterator end = set.end();

    for (HashSet<SVGElementInstance*>::const_iterator it = set.begin(); it != end; ++it) {

        ASSERT((*it)->correspondingElement() == element);

        (*it)->correspondingUseElement()->invalidateShadowTree();

    }

    // Be sure to rebuild use trees, if needed

    element->document()->updateLayoutIgnorePendingStylesheets();

}

ScriptExecutionContext* SVGElementInstance::scriptExecutionContext() const

{

    return m_element->document();

}

bool SVGElementInstance::addEventListener(const AtomicString& eventType, PassRefPtr<EventListener> listener, bool useCapture)

{

    return m_element->addEventListener(eventType, listener, useCapture);

}

bool SVGElementInstance::removeEventListener(const AtomicString& eventType, EventListener* listener, bool useCapture)

{

    return m_element->removeEventListener(eventType, listener, useCapture);

}

void SVGElementInstance::removeAllEventListeners()

{

    m_element->removeAllEventListeners();

}

bool SVGElementInstance::dispatchEvent(PassRefPtr<Event> prpEvent)

{

    RefPtr<EventTarget> protect = this;

    RefPtr<Event> event = prpEvent;

    event->setTarget(this);

    SVGElement* element = shadowTreeElement();

    if (!element)

        return false;

    RefPtr<FrameView> view = element->document()->view();

    return element->dispatchGenericEvent(event.release());

}

EventTargetData* SVGElementInstance::eventTargetData()

{

    // EventTarget would use these methods if we were actually using its add/removeEventListener logic.

    // As we're forwarding those calls to the correspondingElement(), no one should ever call this function.

    ASSERT_NOT_REACHED();

    return 0;

}

EventTargetData* SVGElementInstance::ensureEventTargetData()

{

    // EventTarget would use these methods if we were actually using its add/removeEventListener logic.

    // As we're forwarding those calls to the correspondingElement(), no one should ever call this function.

    ASSERT_NOT_REACHED();

    return 0;

}

}

#endif