/*

 * Copyright (C) 2006 Rob Buis <buis@kde.org>

 *           (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>

 * Copyright (C) 2008 Apple Inc. 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"

#include "CSSCursorImageValue.h"

#include "DocLoader.h"

#include "Document.h"

#include "PlatformString.h"

#include <wtf/MathExtras.h>

#include <wtf/UnusedParam.h>

#if ENABLE(SVG)

#include "SVGCursorElement.h"

#include "SVGURIReference.h"

#endif

namespace WebCore {

#if ENABLE(SVG)

static inline bool isSVGCursorIdentifier(const String& url)

{

    KURL kurl(ParsedURLString, url);

    return kurl.hasFragmentIdentifier();

}

static inline SVGCursorElement* resourceReferencedByCursorElement(const String& fragmentId, Document* document)

{

    Element* element = document->getElementById(SVGURIReference::getTarget(fragmentId));

    if (element && element->hasTagName(SVGNames::cursorTag))

        return static_cast<SVGCursorElement*>(element);

    return 0;

}

#endif

CSSCursorImageValue::CSSCursorImageValue(const String& url, const IntPoint& hotSpot)

    : CSSImageValue(url)

    , m_hotSpot(hotSpot)

{

}

CSSCursorImageValue::~CSSCursorImageValue()

{

#if ENABLE(SVG)

    const String& url = getStringValue();

    if (!isSVGCursorIdentifier(url))

        return;

    HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();

    HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();

    for (; it != end; ++it) {

        SVGElement* referencedElement = *it;

        referencedElement->setCursorImageValue(0);

        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))

            cursorElement->removeClient(referencedElement);

    }

#endif

}

bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)

{

#if !ENABLE(SVG)

    UNUSED_PARAM(element);

#else

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

        return false;

    const String& url = getStringValue();

    if (!isSVGCursorIdentifier(url))

        return false;

    if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, element->document())) {

        // FIXME: This will override hot spot specified in CSS, which is probably incorrect.

        float x = roundf(cursorElement->x().value(0));

        m_hotSpot.setX(static_cast<int>(x));

        float y = roundf(cursorElement->y().value(0));

        m_hotSpot.setY(static_cast<int>(y));

        if (cachedImageURL() != element->document()->completeURL(cursorElement->href()))

            clearCachedImage();

        SVGElement* svgElement = static_cast<SVGElement*>(element);

        m_referencedElements.add(svgElement);

        svgElement->setCursorImageValue(this);

        cursorElement->addClient(svgElement);

        return true;

    }

#endif

    return false;

}

StyleCachedImage* CSSCursorImageValue::cachedImage(DocLoader* loader)

{

    String url = getStringValue();

#if ENABLE(SVG) 

    if (isSVGCursorIdentifier(url) && loader && loader->doc()) {

        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, loader->doc()))

            url = cursorElement->href();

    }

#endif

    return CSSImageValue::cachedImage(loader, url);

}

#if ENABLE(SVG)

void CSSCursorImageValue::removeReferencedElement(SVGElement* element)

{

    m_referencedElements.remove(element);

}

#endif

} // namespace WebCore