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LibWeb: Treat SVG fill/stroke/stroke-width attributes as CSS properties

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Rather than having separate systems for the attributes and their CSS
equivalents, we can treat the attributes as presentational hints and
convert them to CSS properties. This means they can be inherited, as
they should. :^)

As noted, the `fill` and `stroke` attributes do not fully match the
`fill` and `stroke` properties. The CSS spec is still an early draft and
not entirely helpful, so we can just pretend they are the same for now.
This commit is contained in:
Sam Atkins 2022-01-24 15:43:44 +00:00 • committed by Andreas Kling
parent f4ceea2a0e
commit ae99cbe534
2 changed files with 20 additions and 26 deletions
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37
Userland/Libraries/LibWeb/SVG/SVGGraphicsElement.cpp
View file

@ -1,10 +1,11 @@
/* /*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org> * Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org> * Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
* *
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/SVG/SVGGraphicsElement.h> #include <LibWeb/SVG/SVGGraphicsElement.h>
namespace Web::SVG { namespace Web::SVG {
@ -14,25 +15,27 @@ SVGGraphicsElement::SVGGraphicsElement(DOM::Document& document, QualifiedName qu
{ {
} }
void SVGGraphicsElement::parse_attribute(FlyString const& name, String const& value) void SVGGraphicsElement::apply_presentational_hints(CSS::StyleProperties& style) const
{ {
SVGElement::parse_attribute(name, value); CSS::ParsingContext parsing_context { document() };
for_each_attribute([&](auto& name, auto& value) {
if (name == "fill") { if (name.equals_ignoring_case("fill")) {
m_fill_color = Gfx::Color::from_string(value).value_or(Color::Transparent); // FIXME: The `fill` attribute and CSS `fill` property are not the same! But our support is limited enough that they are equivalent for now.
} else if (name == "stroke") { if (auto fill_value = parse_css_value(parsing_context, value, CSS::PropertyID::Fill))
m_stroke_color = Gfx::Color::from_string(value).value_or(Color::Transparent); style.set_property(CSS::PropertyID::Fill, fill_value.release_nonnull());
} else if (name == "stroke-width") { } else if (name.equals_ignoring_case("stroke")) {
auto result = value.to_int(); // FIXME: The `stroke` attribute and CSS `stroke` property are not the same! But our support is limited enough that they are equivalent for now.
if (result.has_value()) if (auto stroke_value = parse_css_value(parsing_context, value, CSS::PropertyID::Stroke))
m_stroke_width = result.value(); style.set_property(CSS::PropertyID::Stroke, stroke_value.release_nonnull());
} } else if (name.equals_ignoring_case("stroke-width")) {
if (auto stroke_width_value = parse_css_value(parsing_context, value, CSS::PropertyID::StrokeWidth))
style.set_property(CSS::PropertyID::StrokeWidth, stroke_width_value.release_nonnull());
}
});
} }
Optional<Gfx::Color> SVGGraphicsElement::fill_color() const Optional<Gfx::Color> SVGGraphicsElement::fill_color() const
{ {
if (m_fill_color.has_value())
return m_fill_color;
if (!layout_node()) if (!layout_node())
return {}; return {};
// FIXME: In the working-draft spec, `fill` is intended to be a shorthand, with `fill-color` // FIXME: In the working-draft spec, `fill` is intended to be a shorthand, with `fill-color`
@ -42,8 +45,6 @@ Optional<Gfx::Color> SVGGraphicsElement::fill_color() const
Optional<Gfx::Color> SVGGraphicsElement::stroke_color() const Optional<Gfx::Color> SVGGraphicsElement::stroke_color() const
{ {
if (m_stroke_color.has_value())
return m_stroke_color;
if (!layout_node()) if (!layout_node())
return {}; return {};
// FIXME: In the working-draft spec, `stroke` is intended to be a shorthand, with `stroke-color` // FIXME: In the working-draft spec, `stroke` is intended to be a shorthand, with `stroke-color`
@ -53,8 +54,6 @@ Optional<Gfx::Color> SVGGraphicsElement::stroke_color() const
Optional<float> SVGGraphicsElement::stroke_width() const Optional<float> SVGGraphicsElement::stroke_width() const
{ {
if (m_stroke_width.has_value())
return m_stroke_width;
if (!layout_node()) if (!layout_node())
return {}; return {};
// FIXME: Converting to pixels isn't really correct - values should be in "user units" // FIXME: Converting to pixels isn't really correct - values should be in "user units"

9
Userland/Libraries/LibWeb/SVG/SVGGraphicsElement.h
View file

@ -1,6 +1,6 @@
/* /*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org> * Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org> * Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
* *
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
@ -20,16 +20,11 @@ public:
SVGGraphicsElement(DOM::Document&, QualifiedName); SVGGraphicsElement(DOM::Document&, QualifiedName);
virtual void parse_attribute(FlyString const& name, String const& value) override; virtual void apply_presentational_hints(CSS::StyleProperties&) const override;
Optional<Gfx::Color> fill_color() const; Optional<Gfx::Color> fill_color() const;
Optional<Gfx::Color> stroke_color() const; Optional<Gfx::Color> stroke_color() const;
Optional<float> stroke_width() const; Optional<float> stroke_width() const;
protected:
Optional<Gfx::Color> m_fill_color;
Optional<Gfx::Color> m_stroke_color;
Optional<float> m_stroke_width;
}; };
} }