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      1 /*
      2  * Copyright (C) 2006 Rob Buis <buis (at) kde.org>
      3  *           (C) 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) 2008 Apple Inc. 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 #include "CSSCursorImageValue.h"
     24 
     25 #include "CachedResourceLoader.h"
     26 #include "Document.h"
     27 #include "PlatformString.h"
     28 #include <wtf/MathExtras.h>
     29 #include <wtf/UnusedParam.h>
     30 
     31 #if ENABLE(SVG)
     32 #include "SVGCursorElement.h"
     33 #include "SVGNames.h"
     34 #include "SVGURIReference.h"
     35 #endif
     36 
     37 namespace WebCore {
     38 
     39 #if ENABLE(SVG)
     40 static inline bool isSVGCursorIdentifier(const String& url)
     41 {
     42     KURL kurl(ParsedURLString, url);
     43     return kurl.hasFragmentIdentifier();
     44 }
     45 
     46 static inline SVGCursorElement* resourceReferencedByCursorElement(const String& fragmentId, Document* document)
     47 {
     48     Element* element = document->getElementById(SVGURIReference::getTarget(fragmentId));
     49     if (element && element->hasTagName(SVGNames::cursorTag))
     50         return static_cast<SVGCursorElement*>(element);
     51 
     52     return 0;
     53 }
     54 #endif
     55 
     56 CSSCursorImageValue::CSSCursorImageValue(const String& url, const IntPoint& hotSpot)
     57     : CSSImageValue(url)
     58     , m_hotSpot(hotSpot)
     59 {
     60 }
     61 
     62 CSSCursorImageValue::~CSSCursorImageValue()
     63 {
     64 #if ENABLE(SVG)
     65     const String& url = getStringValue();
     66     if (!isSVGCursorIdentifier(url))
     67         return;
     68 
     69     HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();
     70     HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();
     71 
     72     for (; it != end; ++it) {
     73         SVGElement* referencedElement = *it;
     74         referencedElement->cursorImageValueRemoved();
     75         if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))
     76             cursorElement->removeClient(referencedElement);
     77     }
     78 #endif
     79 }
     80 
     81 bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)
     82 {
     83 #if !ENABLE(SVG)
     84     UNUSED_PARAM(element);
     85 #else
     86     if (!element || !element->isSVGElement())
     87         return false;
     88 
     89     const String& url = getStringValue();
     90     if (!isSVGCursorIdentifier(url))
     91         return false;
     92 
     93     if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, element->document())) {
     94         // FIXME: This will override hot spot specified in CSS, which is probably incorrect.
     95         float x = roundf(cursorElement->x().value(0));
     96         m_hotSpot.setX(static_cast<int>(x));
     97 
     98         float y = roundf(cursorElement->y().value(0));
     99         m_hotSpot.setY(static_cast<int>(y));
    100 
    101         if (cachedImageURL() != element->document()->completeURL(cursorElement->href()))
    102             clearCachedImage();
    103 
    104         SVGElement* svgElement = static_cast<SVGElement*>(element);
    105         m_referencedElements.add(svgElement);
    106         svgElement->setCursorImageValue(this);
    107         cursorElement->addClient(svgElement);
    108         return true;
    109     }
    110 #endif
    111 
    112     return false;
    113 }
    114 
    115 StyleCachedImage* CSSCursorImageValue::cachedImage(CachedResourceLoader* loader)
    116 {
    117     String url = getStringValue();
    118 
    119 #if ENABLE(SVG)
    120     if (isSVGCursorIdentifier(url) && loader && loader->document()) {
    121         if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, loader->document()))
    122             url = cursorElement->href();
    123     }
    124 #endif
    125 
    126     return CSSImageValue::cachedImage(loader, url);
    127 }
    128 
    129 #if ENABLE(SVG)
    130 void CSSCursorImageValue::removeReferencedElement(SVGElement* element)
    131 {
    132     m_referencedElements.remove(element);
    133 }
    134 #endif
    135 
    136 } // namespace WebCore
    137