1/* 2 * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org> 3 * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org> 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 */ 20 21#include "config.h" 22#include "SVGExternalResourcesRequired.h" 23 24#include "Attr.h" 25#include "SVGElement.h" 26#include "SVGNames.h" 27 28namespace WebCore { 29 30bool SVGExternalResourcesRequired::parseAttribute(const QualifiedName& name, const AtomicString& value) 31{ 32 if (name == SVGNames::externalResourcesRequiredAttr) { 33 setExternalResourcesRequiredBaseValue(value == "true"); 34 return true; 35 } 36 37 return false; 38} 39 40bool SVGExternalResourcesRequired::isKnownAttribute(const QualifiedName& attrName) 41{ 42 return attrName == SVGNames::externalResourcesRequiredAttr; 43} 44 45void SVGExternalResourcesRequired::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes) 46{ 47 supportedAttributes.add(SVGNames::externalResourcesRequiredAttr); 48} 49 50bool SVGExternalResourcesRequired::handleAttributeChange(SVGElement* targetElement, const QualifiedName& attrName) 51{ 52 ASSERT(targetElement); 53 if (!isKnownAttribute(attrName)) 54 return false; 55 if (!targetElement->inDocument()) 56 return true; 57 58 // Handle dynamic updates of the 'externalResourcesRequired' attribute. Only possible case: changing from 'true' to 'false' 59 // causes an immediate dispatch of the SVGLoad event. If the attribute value was 'false' before inserting the script element 60 // in the document, the SVGLoad event has already been dispatched. 61 if (!externalResourcesRequiredBaseValue() && !haveFiredLoadEvent() && !isParserInserted()) { 62 setHaveFiredLoadEvent(true); 63 ASSERT(targetElement->haveLoadedRequiredResources()); 64 65 targetElement->sendSVGLoadEventIfPossible(); 66 } 67 68 return true; 69} 70 71void SVGExternalResourcesRequired::dispatchLoadEvent(SVGElement* targetElement) 72{ 73 bool externalResourcesRequired = externalResourcesRequiredBaseValue(); 74 75 if (isParserInserted()) 76 ASSERT(externalResourcesRequired != haveFiredLoadEvent()); 77 else if (haveFiredLoadEvent()) 78 return; 79 80 // HTML and SVG differ completely in the 'onload' event handling of <script> elements. 81 // HTML fires the 'load' event after it sucessfully loaded a remote resource, otherwise an error event. 82 // SVG fires the SVGLoad event immediately after parsing the <script> element, if externalResourcesRequired 83 // is set to 'false', otherwise it dispatches the 'SVGLoad' event just after loading the remote resource. 84 if (!externalResourcesRequired) 85 return; 86 87 ASSERT(!haveFiredLoadEvent()); 88 89 // Dispatch SVGLoad event 90 setHaveFiredLoadEvent(true); 91 ASSERT(targetElement->haveLoadedRequiredResources()); 92 93 targetElement->sendSVGLoadEventIfPossible(); 94} 95 96void SVGExternalResourcesRequired::insertedIntoDocument(SVGElement* targetElement) 97{ 98 if (isParserInserted()) 99 return; 100 101 // Eventually send SVGLoad event now for the dynamically inserted script element. 102 if (externalResourcesRequiredBaseValue()) 103 return; 104 setHaveFiredLoadEvent(true); 105 targetElement->sendSVGLoadEventIfPossibleAsynchronously(); 106} 107 108void SVGExternalResourcesRequired::finishParsingChildren() 109{ 110 // A SVGLoad event has been fired by SVGElement::finishParsingChildren. 111 if (!externalResourcesRequiredBaseValue()) 112 setHaveFiredLoadEvent(true); 113} 114 115bool SVGExternalResourcesRequired::haveLoadedRequiredResources() const 116{ 117 return !externalResourcesRequiredBaseValue() || haveFiredLoadEvent(); 118} 119 120} 121