1 /*
2 Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
3
4 This file is part of the KDE project
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 "wtf/Platform.h"
23
24 #if ENABLE(SVG)
25 #include "SVGElementInstance.h"
26
27 /*#include "Event.h"
28 #include "EventListener.h"*/
29 #include "SVGElementInstanceList.h"
30 #include "SVGUseElement.h"
31
32 #include <wtf/Assertions.h>
33
34 namespace WebCore
35 {
36
SVGElementInstance(SVGUseElement * useElement,PassRefPtr<SVGElement> originalElement)37 SVGElementInstance::SVGElementInstance(SVGUseElement *useElement, PassRefPtr<SVGElement> originalElement)
38 : m_refCount(0)
39 , m_parent(nullptr)
40 , m_useElement(useElement)
41 , m_element(originalElement)
42 , m_shadowTreeElement(nullptr)
43 , m_previousSibling(nullptr)
44 , m_nextSibling(nullptr)
45 , m_firstChild(nullptr)
46 , m_lastChild(nullptr)
47 {
48 ASSERT(m_useElement);
49 ASSERT(m_element);
50
51 // Register as instance for passed element.
52 m_element->document()->accessSVGExtensions()->mapInstanceToElement(this, m_element.get());
53 }
54
~SVGElementInstance()55 SVGElementInstance::~SVGElementInstance()
56 {
57 for (RefPtr<SVGElementInstance> child = m_firstChild; child; child = child->m_nextSibling) {
58 child->setParent(nullptr);
59 }
60
61 // Deregister as instance for passed element.
62 m_element->document()->accessSVGExtensions()->removeInstanceMapping(this, m_element.get());
63 }
64
correspondingElement() const65 SVGElement *SVGElementInstance::correspondingElement() const
66 {
67 return m_element.get();
68 }
69
correspondingUseElement() const70 SVGUseElement *SVGElementInstance::correspondingUseElement() const
71 {
72 return m_useElement;
73 }
74
parentNode() const75 SVGElementInstance *SVGElementInstance::parentNode() const
76 {
77 return parent();
78 }
79
childNodes()80 PassRefPtr<SVGElementInstanceList> SVGElementInstance::childNodes()
81 {
82 return SVGElementInstanceList::create(this);
83 }
84
previousSibling() const85 SVGElementInstance *SVGElementInstance::previousSibling() const
86 {
87 return m_previousSibling;
88 }
89
nextSibling() const90 SVGElementInstance *SVGElementInstance::nextSibling() const
91 {
92 return m_nextSibling;
93 }
94
firstChild() const95 SVGElementInstance *SVGElementInstance::firstChild() const
96 {
97 return m_firstChild;
98 }
99
lastChild() const100 SVGElementInstance *SVGElementInstance::lastChild() const
101 {
102 return m_lastChild;
103 }
104
shadowTreeElement() const105 SVGElement *SVGElementInstance::shadowTreeElement() const
106 {
107 return m_shadowTreeElement;
108 }
109
setShadowTreeElement(SVGElement * element)110 void SVGElementInstance::setShadowTreeElement(SVGElement *element)
111 {
112 ASSERT(element);
113 m_shadowTreeElement = element;
114 }
115
appendChild(PassRefPtr<SVGElementInstance> child)116 void SVGElementInstance::appendChild(PassRefPtr<SVGElementInstance> child)
117 {
118 child->setParent(this);
119
120 if (m_lastChild) {
121 child->m_previousSibling = m_lastChild;
122 m_lastChild->m_nextSibling = child.get();
123 } else {
124 m_firstChild = child.get();
125 }
126
127 m_lastChild = child.get();
128 }
129
130 // Helper function for updateInstance
containsUseChildNode(Node * start)131 static bool containsUseChildNode(Node *start)
132 {
133 if (start->hasTagName(SVGNames::useTag)) {
134 return true;
135 }
136
137 for (Node *current = start->firstChild(); current; current = current->nextSibling()) {
138 if (containsUseChildNode(current)) {
139 return true;
140 }
141 }
142
143 return false;
144 }
145
updateInstance(SVGElement * element)146 void SVGElementInstance::updateInstance(SVGElement *element)
147 {
148 ASSERT(element == m_element);
149 ASSERT(m_shadowTreeElement);
150 Q_UNUSED(element);
151
152 // TODO: Eventually come up with a more optimized updating logic for the cases below:
153 //
154 // <symbol>: We can't just clone the original element, we need to apply
155 // the same "replace by generated content" logic that SVGUseElement does.
156 //
157 // <svg>: <use> on <svg> is too rare to actually implement it faster.
158 // If someone still wants to do it: recloning, adjusting width/height attributes is enough.
159 //
160 // <use>: Too hard to get it right in a fast way. Recloning seems the only option.
161
162 if (m_element->hasTagName(SVGNames::symbolTag) ||
163 m_element->hasTagName(SVGNames::svgTag) ||
164 containsUseChildNode(m_element.get())) {
165 m_useElement->buildPendingResource();
166 return;
167 }
168
169 // For all other nodes this logic is sufficient.
170 WTF::PassRefPtr<Node> clone = m_element->cloneNode(true);
171 SVGUseElement::removeDisallowedElementsFromSubtree(clone.get());
172 SVGElement *svgClone = nullptr;
173 if (clone && clone->isSVGElement()) {
174 svgClone = static_cast<SVGElement *>(clone.get());
175 }
176 ASSERT(svgClone);
177
178 // Replace node in the <use> shadow tree
179 /*ExceptionCode*//*khtml*/int ec = 0;
180 m_shadowTreeElement->parentNode()->replaceChild(clone.releaseRef(), m_shadowTreeElement, ec);
181 ASSERT(ec == 0);
182
183 m_shadowTreeElement = svgClone;
184 }
185
toSVGElementInstance()186 SVGElementInstance *SVGElementInstance::toSVGElementInstance()
187 {
188 return this;
189 }
190
toNode()191 EventTargetNode *SVGElementInstance::toNode()
192 {
193 return m_element.get();
194 }
195
addEventListener(const AtomicString & eventType,PassRefPtr<EventListener> eventListener,bool useCapture)196 void SVGElementInstance::addEventListener(const AtomicString &eventType, PassRefPtr<EventListener> eventListener, bool useCapture)
197 {
198 Q_UNUSED(eventType);
199 Q_UNUSED(eventListener);
200 Q_UNUSED(useCapture);
201 // FIXME!
202 }
203
removeEventListener(const AtomicString & eventType,EventListener * eventListener,bool useCapture)204 void SVGElementInstance::removeEventListener(const AtomicString &eventType, EventListener *eventListener, bool useCapture)
205 {
206 Q_UNUSED(eventType);
207 Q_UNUSED(eventListener);
208 Q_UNUSED(useCapture);
209 // FIXME!
210 }
211
dispatchEvent(PassRefPtr<Event>,ExceptionCode & ec,bool tempEvent)212 bool SVGElementInstance::dispatchEvent(PassRefPtr<Event>, ExceptionCode &ec, bool tempEvent)
213 {
214 Q_UNUSED(ec);
215 Q_UNUSED(tempEvent);
216 // FIXME!
217 return false;
218 }
219
220 }
221
222 #endif // ENABLE(SVG)
223
224