WebCore/css/CSSCursorImageValue.cpp

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