third_party/WebKit/Source/core/svg/SVGTextPathElement.cpp

   1 /*
   2  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
   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 "core/svg/SVGTextPathElement.h"
  23
  24 #include "core/XLinkNames.h"
  25 #include "core/layout/svg/LayoutSVGTextPath.h"
  26 #include "core/svg/SVGDocumentExtensions.h"
  27
  28 namespace blink {
  29
  30 template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGTextPathMethodType>()
  31 {
  32     DEFINE_STATIC_LOCAL(SVGEnumerationStringEntries, entries, ());
  33     if (entries.isEmpty()) {
  34         entries.append(std::make_pair(SVGTextPathMethodAlign, "align"));
  35         entries.append(std::make_pair(SVGTextPathMethodStretch, "stretch"));
  36     }
  37     return entries;
  38 }
  39
  40 template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGTextPathSpacingType>()
  41 {
  42     DEFINE_STATIC_LOCAL(SVGEnumerationStringEntries, entries, ());
  43     if (entries.isEmpty()) {
  44         entries.append(std::make_pair(SVGTextPathSpacingAuto, "auto"));
  45         entries.append(std::make_pair(SVGTextPathSpacingExact, "exact"));
  46     }
  47     return entries;
  48 }
  49
  50 inline SVGTextPathElement::SVGTextPathElement(Document& document)
  51     : SVGTextContentElement(SVGNames::textPathTag, document)
  52     , SVGURIReference(this)
  53     , m_startOffset(SVGAnimatedLength::create(this, SVGNames::startOffsetAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
  54     , m_method(SVGAnimatedEnumeration<SVGTextPathMethodType>::create(this, SVGNames::methodAttr, SVGTextPathMethodAlign))
  55     , m_spacing(SVGAnimatedEnumeration<SVGTextPathSpacingType>::create(this, SVGNames::spacingAttr, SVGTextPathSpacingExact))
  56 {
  57     addToPropertyMap(m_startOffset);
  58     addToPropertyMap(m_method);
  59     addToPropertyMap(m_spacing);
  60 }
  61
  62 DEFINE_NODE_FACTORY(SVGTextPathElement)
  63
  64 SVGTextPathElement::~SVGTextPathElement()
  65 {
  66 #if !ENABLE(OILPAN)
  67     clearResourceReferences();
  68 #endif
  69 }
  70
  71 DEFINE_TRACE(SVGTextPathElement)
  72 {
  73     visitor->trace(m_startOffset);
  74     visitor->trace(m_method);
  75     visitor->trace(m_spacing);
  76     SVGTextContentElement::trace(visitor);
  77     SVGURIReference::trace(visitor);
  78 }
  79
  80 void SVGTextPathElement::clearResourceReferences()
  81 {
  82     removeAllOutgoingReferences();
  83 }
  84
  85 void SVGTextPathElement::svgAttributeChanged(const QualifiedName& attrName)
  86 {
  87     if (SVGURIReference::isKnownAttribute(attrName)) {
  88         SVGElement::InvalidationGuard invalidationGuard(this);
  89         buildPendingResource();
  90         return;
  91     }
  92
  93     if (attrName == SVGNames::startOffsetAttr)
  94         updateRelativeLengthsInformation();
  95
  96     if (attrName == SVGNames::startOffsetAttr
  97         || attrName == SVGNames::methodAttr
  98         || attrName == SVGNames::spacingAttr) {
  99         SVGElement::InvalidationGuard invalidationGuard(this);
 100         if (LayoutObject* object = layoutObject())
 101             markForLayoutAndParentResourceInvalidation(object);
 102
 103         return;
 104     }
 105
 106     SVGTextContentElement::svgAttributeChanged(attrName);
 107 }
 108
 109 LayoutObject* SVGTextPathElement::createLayoutObject(const ComputedStyle&)
 110 {
 111     return new LayoutSVGTextPath(this);
 112 }
 113
 114 bool SVGTextPathElement::layoutObjectIsNeeded(const ComputedStyle& style)
 115 {
 116     if (parentNode() && (isSVGAElement(*parentNode()) || isSVGTextElement(*parentNode())))
 117         return Element::layoutObjectIsNeeded(style);
 118
 119     return false;
 120 }
 121
 122 void SVGTextPathElement::buildPendingResource()
 123 {
 124     clearResourceReferences();
 125     if (!inDocument())
 126         return;
 127
 128     AtomicString id;
 129     Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), treeScope(), &id);
 130     if (!target) {
 131         // Do not register as pending if we are already pending this resource.
 132         if (document().accessSVGExtensions().isElementPendingResource(this, id))
 133             return;
 134
 135         if (!id.isEmpty()) {
 136             document().accessSVGExtensions().addPendingResource(id, this);
 137             ASSERT(hasPendingResources());
 138         }
 139     } else if (isSVGPathElement(*target)) {
 140         // Register us with the target in the dependencies map. Any change of hrefElement
 141         // that leads to relayout/repainting now informs us, so we can react to it.
 142         addReferenceTo(toSVGElement((target)));
 143     }
 144 }
 145
 146 Node::InsertionNotificationRequest SVGTextPathElement::insertedInto(ContainerNode* rootParent)
 147 {
 148     SVGTextContentElement::insertedInto(rootParent);
 149     buildPendingResource();
 150     return InsertionDone;
 151 }
 152
 153 void SVGTextPathElement::removedFrom(ContainerNode* rootParent)
 154 {
 155     SVGTextContentElement::removedFrom(rootParent);
 156     if (rootParent->inDocument())
 157         clearResourceReferences();
 158 }
 159
 160 bool SVGTextPathElement::selfHasRelativeLengths() const
 161 {
 162     return m_startOffset->currentValue()->isRelative()
 163         || SVGTextContentElement::selfHasRelativeLengths();
 164 }
 165
 166 } // namespace blink