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LibWeb: Implement the CSS outline property :^)

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...along with `outline-color`, `outline-style`, and `outline-width`.

This re-uses the existing border-painting code, which seems to work well
enough!

This replaces the previous code for drawing focus-outlines, with generic
outline painting for any elements that want it. Focus outlines are now
instead supported by this code in Default.css:

```css
:focus-visible {
    outline: auto;
}
```
This commit is contained in:
Sam Atkins 2023-08-02 17:24:14 +01:00 • committed by Andreas Kling
parent 5640779838
commit fe7e797483
15 changed files with 174 additions and 40 deletions
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27
Userland/Libraries/LibWeb/Painting/BorderPainting.cpp
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -10,6 +10,8 @@
#include <LibGfx/AntiAliasingPainter.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Painting/BorderPainting.h>
#include <LibWeb/Painting/PaintContext.h>
@ -627,4 +629,27 @@ void paint_all_borders(PaintContext& context, CSSPixelRect const& bordered_rect,
}
}
Optional<BordersData> borders_data_for_outline(Layout::Node const& layout_node, Color outline_color, CSS::OutlineStyle outline_style, CSSPixels outline_width)
{
CSS::LineStyle line_style;
if (outline_style == CSS::OutlineStyle::Auto) {
// `auto` lets us do whatever we want for the outline. 2px of the link colour seems reasonable.
line_style = CSS::LineStyle::Dotted;
outline_color = layout_node.document().link_color();
outline_width = 2;
} else {
line_style = CSS::value_id_to_line_style(CSS::to_value_id(outline_style)).value_or(CSS::LineStyle::None);
}
if (outline_color.alpha() == 0 || line_style == CSS::LineStyle::None || outline_width == 0)
return {};
CSS::BorderData border_data {
.color = outline_color,
.line_style = line_style,
.width = outline_width,
};
return BordersData { border_data, border_data, border_data, border_data };
}
}