blob: 438c345544a441f7016ad052c82437e2b0ed66d9 [file] [log] [blame]
/*
* Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2018-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGTextContentElement.h"
#include "CSSPropertyNames.h"
#include "CSSValueKeywords.h"
#include "DOMPoint.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "RenderObject.h"
#include "RenderSVGResource.h"
#include "RenderSVGText.h"
#include "SVGElementTypeHelpers.h"
#include "SVGNames.h"
#include "SVGPoint.h"
#include "SVGRect.h"
#include "SVGTextQuery.h"
#include "XMLNames.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(SVGTextContentElement);
SVGTextContentElement::SVGTextContentElement(const QualifiedName& tagName, Document& document)
: SVGGraphicsElement(tagName, document)
{
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
PropertyRegistry::registerProperty<SVGNames::textLengthAttr, &SVGTextContentElement::m_textLength>();
PropertyRegistry::registerProperty<SVGNames::lengthAdjustAttr, SVGLengthAdjustType, &SVGTextContentElement::m_lengthAdjust>();
});
}
unsigned SVGTextContentElement::getNumberOfChars()
{
document().updateLayoutIgnorePendingStylesheets();
return SVGTextQuery(renderer()).numberOfCharacters();
}
float SVGTextContentElement::getComputedTextLength()
{
document().updateLayoutIgnorePendingStylesheets();
return SVGTextQuery(renderer()).textLength();
}
ExceptionOr<float> SVGTextContentElement::getSubStringLength(unsigned charnum, unsigned nchars)
{
unsigned numberOfChars = getNumberOfChars();
if (charnum >= numberOfChars)
return Exception { IndexSizeError };
nchars = std::min(nchars, numberOfChars - charnum);
return SVGTextQuery(renderer()).subStringLength(charnum, nchars);
}
ExceptionOr<Ref<SVGPoint>> SVGTextContentElement::getStartPositionOfChar(unsigned charnum)
{
if (charnum > getNumberOfChars())
return Exception { IndexSizeError };
return SVGPoint::create(SVGTextQuery(renderer()).startPositionOfCharacter(charnum));
}
ExceptionOr<Ref<SVGPoint>> SVGTextContentElement::getEndPositionOfChar(unsigned charnum)
{
if (charnum > getNumberOfChars())
return Exception { IndexSizeError };
return SVGPoint::create(SVGTextQuery(renderer()).endPositionOfCharacter(charnum));
}
ExceptionOr<Ref<SVGRect>> SVGTextContentElement::getExtentOfChar(unsigned charnum)
{
if (charnum > getNumberOfChars())
return Exception { IndexSizeError };
return SVGRect::create(SVGTextQuery(renderer()).extentOfCharacter(charnum));
}
ExceptionOr<float> SVGTextContentElement::getRotationOfChar(unsigned charnum)
{
if (charnum > getNumberOfChars())
return Exception { IndexSizeError };
return SVGTextQuery(renderer()).rotationOfCharacter(charnum);
}
int SVGTextContentElement::getCharNumAtPosition(DOMPointInit&& pointInit)
{
document().updateLayoutIgnorePendingStylesheets();
FloatPoint transformPoint {static_cast<float>(pointInit.x), static_cast<float>(pointInit.y)};
return SVGTextQuery(renderer()).characterNumberAtPosition(transformPoint);
}
ExceptionOr<void> SVGTextContentElement::selectSubString(unsigned charnum, unsigned nchars)
{
unsigned numberOfChars = getNumberOfChars();
if (charnum >= numberOfChars)
return Exception { IndexSizeError };
nchars = std::min(nchars, numberOfChars - charnum);
ASSERT(document().frame());
FrameSelection& selection = document().frame()->selection();
// Find selection start
VisiblePosition start(firstPositionInNode(const_cast<SVGTextContentElement*>(this)));
for (unsigned i = 0; i < charnum; ++i)
start = start.next();
// Find selection end
VisiblePosition end(start);
for (unsigned i = 0; i < nchars; ++i)
end = end.next();
selection.setSelection(VisibleSelection(start, end));
return { };
}
bool SVGTextContentElement::hasPresentationalHintsForAttribute(const QualifiedName& name) const
{
if (name.matches(XMLNames::spaceAttr))
return true;
return SVGGraphicsElement::hasPresentationalHintsForAttribute(name);
}
void SVGTextContentElement::collectPresentationalHintsForAttribute(const QualifiedName& name, const AtomString& value, MutableStyleProperties& style)
{
if (name.matches(XMLNames::spaceAttr)) {
if (value == "preserve"_s)
addPropertyToPresentationalHintStyle(style, CSSPropertyWhiteSpace, CSSValuePre);
else
addPropertyToPresentationalHintStyle(style, CSSPropertyWhiteSpace, CSSValueNowrap);
return;
}
SVGGraphicsElement::collectPresentationalHintsForAttribute(name, value, style);
}
void SVGTextContentElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
SVGParsingError parseError = NoError;
if (name == SVGNames::lengthAdjustAttr) {
auto propertyValue = SVGPropertyTraits<SVGLengthAdjustType>::fromString(value);
if (propertyValue > 0)
m_lengthAdjust->setBaseValInternal<SVGLengthAdjustType>(propertyValue);
} else if (name == SVGNames::textLengthAttr)
m_textLength->setBaseValInternal(SVGLengthValue::construct(SVGLengthMode::Other, value, parseError, SVGLengthNegativeValuesMode::Forbid));
reportAttributeParsingError(parseError, name, value);
SVGGraphicsElement::parseAttribute(name, value);
}
void SVGTextContentElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (PropertyRegistry::isKnownAttribute(attrName)) {
if (attrName == SVGNames::textLengthAttr)
m_specifiedTextLength = m_textLength->baseVal()->value();
InstanceInvalidationGuard guard(*this);
updateSVGRendererForElementChange();
return;
}
SVGGraphicsElement::svgAttributeChanged(attrName);
}
SVGAnimatedLength& SVGTextContentElement::textLengthAnimated()
{
static NeverDestroyed<SVGLengthValue> defaultTextLength(SVGLengthMode::Other);
if (m_textLength->baseVal()->value() == defaultTextLength)
m_textLength->baseVal()->value() = { getComputedTextLength(), SVGLengthType::Number };
return m_textLength;
}
bool SVGTextContentElement::selfHasRelativeLengths() const
{
// Any element of the <text> subtree is advertized as using relative lengths.
// On any window size change, we have to relayout the text subtree, as the
// effective 'on-screen' font size may change.
return true;
}
SVGTextContentElement* SVGTextContentElement::elementFromRenderer(RenderObject* renderer)
{
if (!renderer)
return nullptr;
if (!renderer->isSVGText() && !renderer->isSVGInline())
return nullptr;
SVGElement* element = downcast<SVGElement>(renderer->node());
ASSERT(element);
if (!is<SVGTextContentElement>(element))
return nullptr;
return downcast<SVGTextContentElement>(element);
}
}