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 "CachedResourceLoader.h"
26 #include "TreeScope.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)
isSVGCursorIdentifier(const String & url)40 static inline bool isSVGCursorIdentifier(const String& url)
41 {
42 KURL kurl(ParsedURLString, url);
43 return kurl.hasFragmentIdentifier();
44 }
45
resourceReferencedByCursorElement(const String & fragmentId,TreeScope * scope)46 static inline SVGCursorElement* resourceReferencedByCursorElement(const String& fragmentId, TreeScope* scope)
47 {
48 Element* element = scope->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
CSSCursorImageValue(const String & url,const IntPoint & hotSpot)56 CSSCursorImageValue::CSSCursorImageValue(const String& url, const IntPoint& hotSpot)
57 : CSSImageValue(url)
58 , m_hotSpot(hotSpot)
59 {
60 }
61
~CSSCursorImageValue()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->treeScope()))
76 cursorElement->removeClient(referencedElement);
77 }
78 #endif
79 }
80
updateIfSVGCursorIsUsed(Element * element)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->treeScope())) {
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
cachedImage(CachedResourceLoader * loader)115 StyleCachedImage* CSSCursorImageValue::cachedImage(CachedResourceLoader* loader)
116 {
117 String url = getStringValue();
118
119 #if ENABLE(SVG)
120 if (isSVGCursorIdentifier(url) && loader && loader->document()) {
121 // FIXME: This will fail if the <cursor> element is in a shadow DOM (bug 59827)
122 if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, loader->document()))
123 url = cursorElement->href();
124 }
125 #endif
126
127 return CSSImageValue::cachedImage(loader, url);
128 }
129
130 #if ENABLE(SVG)
removeReferencedElement(SVGElement * element)131 void CSSCursorImageValue::removeReferencedElement(SVGElement* element)
132 {
133 m_referencedElements.remove(element);
134 }
135 #endif
136
137 } // namespace WebCore
138