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LibWeb: Implement SVGGradientElement

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This is the base class for all SVG gradient types. This supports:

- The `gradientUnits` attribute
- The `gradientTransform` attribute
- And following `xlink:hrefs` for inheriting <stops>/attributes
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MacDue 2023-04-21 18:51:00 +01:00 • committed by Andreas Kling
parent a5fa5e55ef
commit 71938550fa
7 changed files with 175 additions and 0 deletions
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78
Userland/Libraries/LibWeb/SVG/SVGGradientElement.cpp Normal file
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/*
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/SVG/AttributeNames.h>
#include <LibWeb/SVG/SVGGradientElement.h>
#include <LibWeb/SVG/SVGGraphicsElement.h>
namespace Web::SVG {
SVGGradientElement::SVGGradientElement(DOM::Document& document, DOM::QualifiedName qualified_name)
: SVGElement(document, move(qualified_name))
{
}
void SVGGradientElement::parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value)
{
SVGElement::parse_attribute(name, value);
if (name == AttributeNames::gradientUnits) {
m_gradient_units = AttributeParser::parse_gradient_units(value);
} else if (name == AttributeNames::gradientTransform) {
if (auto transform_list = AttributeParser::parse_transform(value); transform_list.has_value()) {
m_gradient_transform = transform_from_transform_list(*transform_list);
} else {
m_gradient_transform = {};
}
}
}
GradientUnits SVGGradientElement::gradient_units() const
{
if (m_gradient_units.has_value())
return *m_gradient_units;
if (auto href = xlink_href())
return href->gradient_units();
return GradientUnits::ObjectBoundingBox;
}
Optional<Gfx::AffineTransform> SVGGradientElement::gradient_transform() const
{
if (m_gradient_transform.has_value())
return m_gradient_transform;
if (auto href = xlink_href())
return href->gradient_transform();
return {};
}
JS::GCPtr<SVGGradientElement const> SVGGradientElement::xlink_href() const
{
// FIXME: This entire function is an ad-hoc hack!
// It can only resolve #<ids> in the same document.
if (auto href = get_attribute("href"); !href.is_empty()) {
auto url = document().parse_url(href);
auto id = url.fragment();
if (id.is_empty())
return {};
auto element = document().get_element_by_id(id);
if (!element)
return {};
if (!is<SVGGradientElement>(*element))
return {};
return &verify_cast<SVGGradientElement>(*element);
}
return {};
}
JS::ThrowCompletionOr<void> SVGGradientElement::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGGradientElementPrototype>(realm, "SVGGradientElement"));
return {};
}
}