SVGPropertyAnimator.h [plain text]
#pragma once
#include "CSSComputedStyleDeclaration.h"
#include "CSSPropertyParser.h"
#include "SVGAttributeAnimator.h"
#include "SVGElement.h"
namespace WebCore {
template<typename AnimationFunction>
class SVGPropertyAnimator : public SVGAttributeAnimator {
public:
bool isDiscrete() const override { return m_function.isDiscrete(); }
void setFromAndToValues(SVGElement* targetElement, const String& from, const String& to) override
{
m_function.setFromAndToValues(targetElement, adjustForInheritance(targetElement, from), adjustForInheritance(targetElement, to));
}
void setFromAndByValues(SVGElement* targetElement, const String& from, const String& by) override
{
m_function.setFromAndByValues(targetElement, from, by);
}
void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
{
m_function.setToAtEndOfDurationValue(toAtEndOfDuration);
}
protected:
template<typename... Arguments>
SVGPropertyAnimator(const QualifiedName& attributeName, Arguments&&... arguments)
: SVGAttributeAnimator(attributeName)
, m_function(std::forward<Arguments>(arguments)...)
{
}
void stop(SVGElement* targetElement) override
{
removeAnimatedStyleProperty(targetElement);
}
Optional<float> calculateDistance(SVGElement* targetElement, const String& from, const String& to) const override
{
return m_function.calculateDistance(targetElement, from, to);
}
String adjustForInheritance(SVGElement* targetElement, const String& value) const
{
static MainThreadNeverDestroyed<const AtomString> inherit("inherit", AtomString::ConstructFromLiteral);
return value == inherit ? computeInheritedCSSPropertyValue(targetElement) : value;
}
String computeCSSPropertyValue(SVGElement* targetElement, CSSPropertyID id) const
{
ASSERT(targetElement);
targetElement->setUseOverrideComputedStyle(true);
RefPtr<CSSValue> value = ComputedStyleExtractor(targetElement).propertyValue(id);
targetElement->setUseOverrideComputedStyle(false);
return value ? value->cssText() : String();
}
String computeInheritedCSSPropertyValue(SVGElement* targetElement) const
{
ASSERT(targetElement);
auto parent = makeRefPtr(targetElement->parentElement());
if (!parent || !parent->isSVGElement())
return emptyString();
SVGElement& svgParent = downcast<SVGElement>(*parent);
return computeCSSPropertyValue(&svgParent, cssPropertyID(m_attributeName.localName()));
}
AnimationFunction m_function;
};
}