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LibWeb: Implement Window::query_media_feature()

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This method provides the needed information to evaluate media queries.

Every feature in Media Queries Level 4 is present, either as code or as
a FIXME: https://www.w3.org/TR/mediaqueries-4/#media-descriptor-table
There's a draft Level 5 which I have ignored for now.

Some are unimplemented for now since we do not have access to the
requested information. Some require StyleValue types that we do not yet
support. Many are hard-coded for now since we do not (and may never)
support monochrome or text-only displays for Browser.
This commit is contained in:
Sam Atkins 2021-10-03 19:26:17 +01:00 • committed by Andreas Kling
parent de82764f2f
commit fd51b02f9d
Notes: sideshowbarker 2024-07-18 03:01:19 +09:00
2 changed files with 45 additions and 0 deletions
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44
Userland/Libraries/LibWeb/DOM/Window.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -287,6 +288,49 @@ NonnullRefPtr<CSS::MediaQueryList> Window::match_media(String media)
return CSS::MediaQueryList::create(associated_document(), parse_media_query_list(CSS::ParsingContext(associated_document()), media));
}
RefPtr<CSS::StyleValue> Window::query_media_feature(FlyString const& name) const
{
// FIXME: Many of these should be dependent on the hardware
if (name.equals_ignoring_case("any-hover"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Hover);
if (name.equals_ignoring_case("any-pointer"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Fine);
// FIXME: aspect-ratio
if (name.equals_ignoring_case("color"sv))
return CSS::NumericStyleValue::create(32);
if (name.equals_ignoring_case("color-gamut"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Srgb);
if (name.equals_ignoring_case("color-index"sv))
return CSS::NumericStyleValue::create(0);
// FIXME: device-aspect-ratio
// FIXME: device-height
// FIXME: device-width
if (name.equals_ignoring_case("grid"sv))
return CSS::NumericStyleValue::create(0);
if (name.equals_ignoring_case("height"sv))
return CSS::LengthStyleValue::create(CSS::Length::make_px(inner_height()));
if (name.equals_ignoring_case("hover"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Hover);
if (name.equals_ignoring_case("monochrome"sv))
return CSS::NumericStyleValue::create(0);
if (name.equals_ignoring_case("hover"sv))
return CSS::IdentifierStyleValue::create(inner_height() >= inner_width() ? CSS::ValueID::Portrait : CSS::ValueID::Landscape);
if (name.equals_ignoring_case("overflow-block"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Scroll);
// FIXME: overflow-inline
if (name.equals_ignoring_case("pointer"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Fine);
// FIXME: resolution
if (name.equals_ignoring_case("scan"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Progressive);
if (name.equals_ignoring_case("update"sv))
return CSS::IdentifierStyleValue::create(CSS::ValueID::Fast);
if (name.equals_ignoring_case("width"sv))
return CSS::LengthStyleValue::create(CSS::Length::make_px(inner_width()));
return {};
}
// https://www.w3.org/TR/cssom-view/#dom-window-scrollx
float Window::scroll_x() const
{

1
Userland/Libraries/LibWeb/DOM/Window.h
View file

@ -84,6 +84,7 @@ public:
NonnullRefPtr<CSS::CSSStyleDeclaration> get_computed_style(DOM::Element&) const;
NonnullRefPtr<CSS::MediaQueryList> match_media(String);
RefPtr<CSS::StyleValue> query_media_feature(FlyString const&) const;
float scroll_x() const;
float scroll_y() const;