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https://github.com/RGBCube/serenity
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0f6782fae6
This should allow us to add a Element::attribute which returns an Optional<String>. Eventually all callers should be ported to switch from the DeprecatedString version, but in the meantime, this should allow us to port some more IDL interfaces away from DeprecatedString.
125 lines
5.4 KiB
C++
125 lines
5.4 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Event.h>
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#include <LibWeb/HTML/Parser/HTMLParser.h>
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#include <LibWeb/Layout/SVGSVGBox.h>
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/SVGSVGElement.h>
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namespace Web::SVG {
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SVGSVGElement::SVGSVGElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: SVGGraphicsElement(document, qualified_name)
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{
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}
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void SVGSVGElement::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGSVGElementPrototype>(realm, "SVGSVGElement"));
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}
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JS::GCPtr<Layout::Node> SVGSVGElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
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{
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return heap().allocate_without_realm<Layout::SVGSVGBox>(document(), *this, move(style));
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}
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void SVGSVGElement::apply_presentational_hints(CSS::StyleProperties& style) const
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{
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Base::apply_presentational_hints(style);
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// NOTE: Hack to ensure SVG unitless widths/heights are parsed even with <!DOCTYPE html>
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FIXME::TemporarilyEnableQuirksMode enable_quirks(document());
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auto width_attribute = deprecated_attribute(SVG::AttributeNames::width);
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auto parsing_context = CSS::Parser::ParsingContext { document() };
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if (auto width_value = parse_css_value(parsing_context, deprecated_attribute(Web::HTML::AttributeNames::width), CSS::PropertyID::Width)) {
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style.set_property(CSS::PropertyID::Width, width_value.release_nonnull());
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} else if (width_attribute == "") {
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// If the `width` attribute is an empty string, it defaults to 100%.
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// This matches WebKit and Blink, but not Firefox. The spec is unclear.
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// FIXME: Figure out what to do here.
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style.set_property(CSS::PropertyID::Width, CSS::PercentageStyleValue::create(CSS::Percentage { 100 }));
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}
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// Height defaults to 100%
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auto height_attribute = deprecated_attribute(SVG::AttributeNames::height);
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if (auto height_value = parse_css_value(parsing_context, deprecated_attribute(Web::HTML::AttributeNames::height), CSS::PropertyID::Height)) {
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style.set_property(CSS::PropertyID::Height, height_value.release_nonnull());
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} else if (height_attribute == "") {
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// If the `height` attribute is an empty string, it defaults to 100%.
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// This matches WebKit and Blink, but not Firefox. The spec is unclear.
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// FIXME: Figure out what to do here.
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style.set_property(CSS::PropertyID::Height, CSS::PercentageStyleValue::create(CSS::Percentage { 100 }));
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}
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}
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void SVGSVGElement::attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value)
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{
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SVGGraphicsElement::attribute_changed(name, value);
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if (name.equals_ignoring_ascii_case(SVG::AttributeNames::viewBox))
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m_view_box = try_parse_view_box(value);
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if (name.equals_ignoring_ascii_case(SVG::AttributeNames::preserveAspectRatio))
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m_preserve_aspect_ratio = AttributeParser::parse_preserve_aspect_ratio(value);
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if (name.equals_ignoring_ascii_case(SVG::AttributeNames::width) || name.equals_ignoring_ascii_case(SVG::AttributeNames::height))
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update_fallback_view_box_for_svg_as_image();
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}
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void SVGSVGElement::update_fallback_view_box_for_svg_as_image()
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{
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// AD-HOC: This creates a fallback viewBox for SVGs used as images.
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// If the <svg> element has width and height, but no viewBox,
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// we fall back to a synthetic viewBox="0 0 width height".
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Optional<double> width;
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Optional<double> height;
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auto width_attribute = deprecated_attribute(SVG::AttributeNames::width);
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auto parsing_context = CSS::Parser::ParsingContext { document() };
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if (auto width_value = parse_css_value(parsing_context, deprecated_attribute(Web::HTML::AttributeNames::width), CSS::PropertyID::Width)) {
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if (width_value->is_length() && width_value->as_length().length().is_absolute())
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width = width_value->as_length().length().absolute_length_to_px().to_double();
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}
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auto height_attribute = deprecated_attribute(SVG::AttributeNames::height);
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if (auto height_value = parse_css_value(parsing_context, deprecated_attribute(Web::HTML::AttributeNames::height), CSS::PropertyID::Height)) {
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if (height_value->is_length() && height_value->as_length().length().is_absolute())
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height = height_value->as_length().length().absolute_length_to_px().to_double();
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}
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if (width.has_value() && width.value() > 0 && height.has_value() && height.value() > 0) {
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m_fallback_view_box_for_svg_as_image = ViewBox { 0, 0, width.value(), height.value() };
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} else {
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m_fallback_view_box_for_svg_as_image = {};
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}
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}
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void SVGSVGElement::set_fallback_view_box_for_svg_as_image(Optional<ViewBox> view_box)
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{
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m_fallback_view_box_for_svg_as_image = view_box;
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}
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Optional<ViewBox> SVGSVGElement::view_box() const
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{
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if (m_view_box.has_value())
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return m_view_box;
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// NOTE: If the parent is a document, we're an <svg> element used as an image.
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if (parent() && parent()->is_document() && m_fallback_view_box_for_svg_as_image.has_value())
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return m_fallback_view_box_for_svg_as_image;
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return {};
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}
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}
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