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LibWeb: Add scalable radio buttons (with theme/accent-color support)

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These are similar to the checkboxes now (though no SDFs here all just
plain AA painter).
This commit is contained in:
MacDue 2023-03-23 22:54:43 +00:00 committed by Linus Groh
parent 56bc653e72
commit dd77b878b3
Notes: sideshowbarker 2024-07-17 01:13:25 +09:00 
Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/dd77b878b3
Pull-request: https://github.com/SerenityOS/serenity/pull/18022
Reviewed-by: https://github.com/linusg ✅
1 changed files with 54 additions and 3 deletions
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57
Userland/Libraries/LibWeb/Painting/RadioButtonPaintable.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -11,6 +12,7 @@
#include <LibWeb/HTML/HTMLInputElement.h>
#include <LibWeb/Layout/Label.h>
#include <LibWeb/Layout/RadioButton.h>
#include <LibWeb/Painting/InputColors.h>
#include <LibWeb/Painting/RadioButtonPaintable.h>
namespace Web::Painting {
@ -32,9 +34,58 @@ void RadioButtonPaintable::paint(PaintContext& context, PaintPhase phase) const
PaintableBox::paint(context, phase);
auto const& radio_box = static_cast<HTML::HTMLInputElement const&>(layout_box().dom_node());
if (phase == PaintPhase::Foreground)
Gfx::StylePainter::paint_radio_button(context.painter(), context.enclosing_device_rect(absolute_rect()).to_type<int>(), context.palette(), radio_box.checked(), being_pressed());
if (phase != PaintPhase::Foreground)
return;
Gfx::AntiAliasingPainter painter { context.painter() };
auto draw_circle = [&](auto const& rect, Color color) {
// Note: Doing this is a bit more forgiving than draw_circle() which will round to the nearset even radius.
// This will fudge it (which works better here).
painter.fill_rect_with_rounded_corners(rect, color, rect.width() / 2);
};
auto shrink_all = [&](auto const& rect, int amount) {
return rect.shrunken(amount, amount, amount, amount);
};
auto const& radio_button = static_cast<HTML::HTMLInputElement const&>(layout_box().dom_node());
auto& palette = context.palette();
bool enabled = layout_box().dom_node().enabled();
auto input_colors = compute_input_colors(palette, computed_values().accent_color());
auto background_color = input_colors.background_color(enabled);
auto accent = input_colors.accent;
auto radio_color = [&] {
if (radio_button.checked()) {
// Handle the awkward case where a light color has been used for the accent color.
if (accent.contrast_ratio(background_color) < 2 && accent.contrast_ratio(input_colors.dark_gray) > 2)
background_color = input_colors.dark_gray;
return accent;
}
return input_colors.gray;
};
auto fill_color = [&] {
if (!enabled)
return input_colors.mid_gray;
auto color = radio_color();
if (being_pressed())
color = InputColors::get_shade(color, 0.3f, palette.is_dark());
return color;
}();
// This is based on a 1px outer border and 2px inner border when drawn at 13x13.
auto radio_button_rect = context.enclosing_device_rect(absolute_rect()).to_type<int>();
auto outer_border_width = max(1, static_cast<int>(ceilf(radio_button_rect.width() / 13.0f)));
auto inner_border_width = max(2, static_cast<int>(ceilf(radio_button_rect.width() / 4.0f)));
draw_circle(radio_button_rect, fill_color);
draw_circle(shrink_all(radio_button_rect, outer_border_width), background_color);
if (radio_button.checked())
draw_circle(shrink_all(radio_button_rect, inner_border_width), fill_color);
}
}