106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
/*
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* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Position.h"
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#include <LibGfx/Point.h>
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#include <LibGfx/Rect.h>
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namespace Web::CSS {
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CSSPixelPoint PositionValue::resolved(Layout::Node const& node, CSSPixelRect const& rect) const
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{
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// Note: A preset + a none default x/y_relative_to is impossible in the syntax (and makes little sense)
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CSSPixels x = horizontal_position.visit(
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[&](HorizontalPreset preset) -> CSSPixels {
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return rect.width() * [&] {
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switch (preset) {
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case HorizontalPreset::Left:
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return 0.;
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case HorizontalPreset::Center:
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return 0.5;
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case HorizontalPreset::Right:
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return 1.;
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default:
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VERIFY_NOT_REACHED();
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}
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}();
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},
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[&](LengthPercentage length_percentage) -> CSSPixels {
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return length_percentage.to_px(node, rect.width());
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});
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CSSPixels y = vertical_position.visit(
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[&](VerticalPreset preset) -> CSSPixels {
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return rect.height() * [&] {
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switch (preset) {
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case VerticalPreset::Top:
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return 0.;
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case VerticalPreset::Center:
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return 0.5;
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case VerticalPreset::Bottom:
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return 1.;
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default:
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VERIFY_NOT_REACHED();
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}
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}();
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},
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[&](LengthPercentage length_percentage) -> CSSPixels {
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return length_percentage.to_px(node, rect.height());
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});
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if (x_relative_to == HorizontalEdge::Right)
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x = rect.width() - x;
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if (y_relative_to == VerticalEdge::Bottom)
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y = rect.height() - y;
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return CSSPixelPoint { rect.x() + x, rect.y() + y };
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}
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void PositionValue::serialize(StringBuilder& builder) const
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{
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// Note: This means our serialization with simplify any with explicit edges that are just `top left`.
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bool has_relative_edges = x_relative_to == HorizontalEdge::Right || y_relative_to == VerticalEdge::Bottom;
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if (has_relative_edges)
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builder.append(x_relative_to == HorizontalEdge::Left ? "left "sv : "right "sv);
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horizontal_position.visit(
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[&](HorizontalPreset preset) {
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builder.append([&] {
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switch (preset) {
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case HorizontalPreset::Left:
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return "left"sv;
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case HorizontalPreset::Center:
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return "center"sv;
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case HorizontalPreset::Right:
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return "right"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}());
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},
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[&](LengthPercentage length_percentage) {
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builder.append(length_percentage.to_string());
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});
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builder.append(' ');
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if (has_relative_edges)
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builder.append(y_relative_to == VerticalEdge::Top ? "top "sv : "bottom "sv);
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vertical_position.visit(
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[&](VerticalPreset preset) {
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builder.append([&] {
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switch (preset) {
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case VerticalPreset::Top:
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return "top"sv;
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case VerticalPreset::Center:
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return "center"sv;
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case VerticalPreset::Bottom:
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return "bottom"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}());
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},
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[&](LengthPercentage length_percentage) {
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builder.append(length_percentage.to_string());
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});
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}
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}
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