WebCore/svg/SVGAElement.cpp

   1 /*
   2     Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3                   2004, 2005, 2007 Rob Buis <buis@kde.org>
   4                   2007 Eric Seidel <eric@webkit.org>
   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
  24 #if ENABLE(SVG)
  25 #include "SVGAElement.h"
  26
  27 #include "Attr.h"
  28 #include "CSSHelper.h"
  29 #include "Document.h"
  30 #include "EventHandler.h"
  31 #include "EventNames.h"
  32 #include "Frame.h"
  33 #include "FrameLoader.h"
  34 #include "FrameLoaderTypes.h"
  35 #include "KeyboardEvent.h"
  36 #include "MappedAttribute.h"
  37 #include "MouseEvent.h"
  38 #include "PlatformMouseEvent.h"
  39 #include "RenderSVGInline.h"
  40 #include "RenderSVGTransformableContainer.h"
  41 #include "ResourceRequest.h"
  42 #include "SVGNames.h"
  43 #include "SVGSMILElement.h"
  44 #include "XLinkNames.h"
  45
  46 namespace WebCore {
  47
  48 SVGAElement::SVGAElement(const QualifiedName& tagName, Document *doc)
  49     : SVGStyledTransformableElement(tagName, doc)
  50     , SVGURIReference()
  51     , SVGTests()
  52     , SVGLangSpace()
  53     , SVGExternalResourcesRequired()
  54     , m_target(this, SVGNames::targetAttr)
  55     , m_href(this, XLinkNames::hrefAttr)
  56     , m_externalResourcesRequired(this, SVGNames::externalResourcesRequiredAttr, false)
  57 {
  58 }
  59
  60 SVGAElement::~SVGAElement()
  61 {
  62 }
  63
  64 String SVGAElement::title() const
  65 {
  66     return getAttribute(XLinkNames::titleAttr);
  67 }
  68
  69 void SVGAElement::parseMappedAttribute(MappedAttribute* attr)
  70 {
  71     if (attr->name() == SVGNames::targetAttr)
  72         setTargetBaseValue(attr->value());
  73     else {
  74         if (SVGURIReference::parseMappedAttribute(attr))
  75             return;
  76         if (SVGTests::parseMappedAttribute(attr))
  77             return;
  78         if (SVGLangSpace::parseMappedAttribute(attr))
  79             return;
  80         if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
  81             return;
  82         SVGStyledTransformableElement::parseMappedAttribute(attr);
  83     }
  84 }
  85
  86 void SVGAElement::svgAttributeChanged(const QualifiedName& attrName)
  87 {
  88     SVGStyledTransformableElement::svgAttributeChanged(attrName);
  89
  90     // Unlike other SVG*Element classes, SVGAElement only listens to SVGURIReference changes
  91     // as none of the other properties changes the linking behaviour for our <a> element.
  92     if (SVGURIReference::isKnownAttribute(attrName)) {
  93         bool wasLink = isLink();
  94         setIsLink(!href().isNull());
  95
  96         if (wasLink != isLink())
  97             setNeedsStyleRecalc();
  98     }
  99 }
 100
 101 RenderObject* SVGAElement::createRenderer(RenderArena* arena, RenderStyle*)
 102 {
 103     if (static_cast<SVGElement*>(parent())->isTextContent())
 104         return new (arena) RenderSVGInline(this);
 105
 106     return new (arena) RenderSVGTransformableContainer(this);
 107 }
 108
 109 void SVGAElement::defaultEventHandler(Event* evt)
 110 {
 111     if (isLink() && (evt->type() == eventNames().clickEvent || (evt->type() == eventNames().keydownEvent && focused()))) {
 112         MouseEvent* e = 0;
 113         if (evt->type() == eventNames().clickEvent && evt->isMouseEvent())
 114             e = static_cast<MouseEvent*>(evt);
 115
 116         KeyboardEvent* k = 0;
 117         if (evt->type() == eventNames().keydownEvent && evt->isKeyboardEvent())
 118             k = static_cast<KeyboardEvent*>(evt);
 119
 120         if (e && e->button() == RightButton) {
 121             SVGStyledTransformableElement::defaultEventHandler(evt);
 122             return;
 123         }
 124
 125         if (k) {
 126             if (k->keyIdentifier() != "Enter") {
 127                 SVGStyledTransformableElement::defaultEventHandler(evt);
 128                 return;
 129             }
 130             evt->setDefaultHandled();
 131             dispatchSimulatedClick(evt);
 132             return;
 133         }
 134
 135         String target = this->target();
 136         if (e && e->button() == MiddleButton)
 137             target = "_blank";
 138         else if (target.isEmpty()) // if target is empty, default to "_self" or use xlink:target if set
 139             target = (getAttribute(XLinkNames::showAttr) == "new") ? "_blank" : "_self";
 140
 141         if (!evt->defaultPrevented()) {
 142             String url = deprecatedParseURL(href());
 143 #if ENABLE(SVG_ANIMATION)
 144             if (url.startsWith("#")) {
 145                 Element* targetElement = document()->getElementById(url.substring(1));
 146                 if (SVGSMILElement::isSMILElement(targetElement)) {
 147                     SVGSMILElement* timed = static_cast<SVGSMILElement*>(targetElement);
 148                     timed->beginByLinkActivation();
 149                     evt->setDefaultHandled();
 150                     SVGStyledTransformableElement::defaultEventHandler(evt);
 151                     return;
 152                 }
 153             }
 154 #endif
 155             if (document()->frame())
 156                 document()->frame()->loader()->urlSelected(document()->completeURL(url), target, evt, false, false, true, SendReferrer);
 157         }
 158
 159         evt->setDefaultHandled();
 160     }
 161
 162     SVGStyledTransformableElement::defaultEventHandler(evt);
 163 }
 164
 165 bool SVGAElement::supportsFocus() const
 166 {
 167     if (isContentEditable())
 168         return SVGStyledTransformableElement::supportsFocus();
 169     return true;
 170 }
 171
 172 bool SVGAElement::isFocusable() const
 173 {
 174     if (renderer() && renderer()->absoluteClippedOverflowRect().isEmpty())
 175         return false;
 176
 177     return SVGElement::isFocusable();
 178 }
 179
 180 bool SVGAElement::isMouseFocusable() const
 181 {
 182     return false;
 183 }
 184
 185 bool SVGAElement::isKeyboardFocusable(KeyboardEvent* event) const
 186 {
 187     if (!isFocusable())
 188         return false;
 189
 190     if (!document()->frame())
 191         return false;
 192
 193     return document()->frame()->eventHandler()->tabsToLinks(event);
 194 }
 195
 196 bool SVGAElement::childShouldCreateRenderer(Node* child) const
 197 {
 198     // http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
 199     // The 'a' element may contain any element that its parent may contain, except itself.
 200     if (child->hasTagName(SVGNames::aTag))
 201         return false;
 202     if (parent() && parent()->isSVGElement())
 203         return static_cast<SVGElement*>(parent())->childShouldCreateRenderer(child);
 204
 205     return SVGElement::childShouldCreateRenderer(child);
 206 }
 207
 208 } // namespace WebCore
 209
 210 #endif // ENABLE(SVG)