d64ddeaec4
It's in Position.{h,cpp} because it represents a <position> in CSS, even
though it's currently named PositionValue to avoid collisions.
108 lines
3.9 KiB
C++
108 lines
3.9 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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#include <LibWeb/CSS/StyleValue.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 0.0f;
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case HorizontalPreset::Center:
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return 0.5f;
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case HorizontalPreset::Right:
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return 1.0f;
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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.resolved(node, Length::make_px(rect.width())).to_px(node);
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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 0.0f;
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case VerticalPreset::Center:
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return 0.5f;
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case VerticalPreset::Bottom:
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return 1.0f;
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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.resolved(node, Length::make_px(rect.height())).to_px(node);
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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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ErrorOr<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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TRY(builder.try_append(x_relative_to == HorizontalEdge::Left ? "left "sv : "right "sv));
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TRY(horizontal_position.visit(
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[&](HorizontalPreset preset) -> ErrorOr<void> {
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return builder.try_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) -> ErrorOr<void> {
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return builder.try_appendff(TRY(length_percentage.to_string()));
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}));
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TRY(builder.try_append(' '));
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if (has_relative_edges)
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TRY(builder.try_append(y_relative_to == VerticalEdge::Top ? "top "sv : "bottom "sv));
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TRY(vertical_position.visit(
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[&](VerticalPreset preset) -> ErrorOr<void> {
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return builder.try_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) -> ErrorOr<void> {
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return builder.try_append(TRY(length_percentage.to_string()));
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}));
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return {};
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}
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}
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