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

   1 /*
   2  * Copyright (C) 2006 Apple Inc. All rights reserved.
   3  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@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 "core/svg/SVGForeignObjectElement.h"
  23
  24 #include "core/XLinkNames.h"
  25 #include "core/frame/UseCounter.h"
  26 #include "core/layout/svg/LayoutSVGForeignObject.h"
  27 #include "core/svg/SVGLength.h"
  28 #include "wtf/Assertions.h"
  29
  30 namespace blink {
  31
  32 inline SVGForeignObjectElement::SVGForeignObjectElement(Document& document)
  33     : SVGGraphicsElement(SVGNames::foreignObjectTag, document)
  34     , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
  35     , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
  36     , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width), ForbidNegativeLengths))
  37     , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height), ForbidNegativeLengths))
  38 {
  39     addToPropertyMap(m_x);
  40     addToPropertyMap(m_y);
  41     addToPropertyMap(m_width);
  42     addToPropertyMap(m_height);
  43
  44     UseCounter::count(document, UseCounter::SVGForeignObjectElement);
  45 }
  46
  47 DEFINE_TRACE(SVGForeignObjectElement)
  48 {
  49     visitor->trace(m_x);
  50     visitor->trace(m_y);
  51     visitor->trace(m_width);
  52     visitor->trace(m_height);
  53     SVGGraphicsElement::trace(visitor);
  54 }
  55
  56 DEFINE_NODE_FACTORY(SVGForeignObjectElement)
  57
  58 bool SVGForeignObjectElement::isPresentationAttribute(const QualifiedName& name) const
  59 {
  60     if (name == SVGNames::xAttr || name == SVGNames::yAttr
  61         || name == SVGNames::widthAttr || name == SVGNames::heightAttr)
  62         return true;
  63     return SVGGraphicsElement::isPresentationAttribute(name);
  64 }
  65
  66 bool SVGForeignObjectElement::isPresentationAttributeWithSVGDOM(const QualifiedName& attrName) const
  67 {
  68     if (attrName == SVGNames::xAttr || attrName== SVGNames::yAttr
  69         || attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr)
  70         return true;
  71     return SVGGraphicsElement::isPresentationAttributeWithSVGDOM(attrName);
  72 }
  73
  74 void SVGForeignObjectElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
  75 {
  76     RefPtrWillBeRawPtr<SVGAnimatedPropertyBase> property = propertyFromAttribute(name);
  77     if (property == m_width)
  78         addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyWidth, *m_width->currentValue());
  79     else if (property == m_height)
  80         addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyHeight, *m_height->currentValue());
  81     else if (property == m_x)
  82         addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyX, *m_x->currentValue());
  83     else if (property == m_y)
  84         addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyY, *m_y->currentValue());
  85     else
  86         SVGGraphicsElement::collectStyleForPresentationAttribute(name, value, style);
  87 }
  88
  89 void SVGForeignObjectElement::svgAttributeChanged(const QualifiedName& attrName)
  90 {
  91     bool isWidthHeightAttribute = attrName == SVGNames::widthAttr
  92         || attrName == SVGNames::heightAttr;
  93     bool isXYAttribute = attrName == SVGNames::xAttr || attrName == SVGNames::yAttr;
  94
  95     if (isXYAttribute || isWidthHeightAttribute) {
  96         SVGElement::InvalidationGuard invalidationGuard(this);
  97
  98         invalidateSVGPresentationAttributeStyle();
  99         setNeedsStyleRecalc(LocalStyleChange,
 100             isWidthHeightAttribute ? StyleChangeReasonForTracing::create(StyleChangeReason::SVGContainerSizeChange) : StyleChangeReasonForTracing::fromAttribute(attrName));
 101
 102         updateRelativeLengthsInformation();
 103         if (LayoutObject* layoutObject = this->layoutObject())
 104             markForLayoutAndParentResourceInvalidation(layoutObject);
 105
 106         return;
 107     }
 108
 109     SVGGraphicsElement::svgAttributeChanged(attrName);
 110 }
 111
 112 LayoutObject* SVGForeignObjectElement::createLayoutObject(const ComputedStyle&)
 113 {
 114     return new LayoutSVGForeignObject(this);
 115 }
 116
 117 bool SVGForeignObjectElement::layoutObjectIsNeeded(const ComputedStyle& style)
 118 {
 119     // Suppress foreignObject layoutObjects in SVG hidden containers.
 120     // (https://bugs.webkit.org/show_bug.cgi?id=87297)
 121     // Note that we currently do not support foreignObject instantiation via <use>, hence it is safe
 122     // to use parentElement() here. If that changes, this method should be updated to use
 123     // parentOrShadowHostElement() instead.
 124     Element* ancestor = parentElement();
 125     while (ancestor && ancestor->isSVGElement()) {
 126         if (ancestor->layoutObject() && ancestor->layoutObject()->isSVGHiddenContainer())
 127             return false;
 128
 129         ancestor = ancestor->parentElement();
 130     }
 131
 132     return SVGGraphicsElement::layoutObjectIsNeeded(style);
 133 }
 134
 135 bool SVGForeignObjectElement::selfHasRelativeLengths() const
 136 {
 137     return m_x->currentValue()->isRelative()
 138         || m_y->currentValue()->isRelative()
 139         || m_width->currentValue()->isRelative()
 140         || m_height->currentValue()->isRelative();
 141 }
 142
 143 } // namespace blink