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LibWeb: Move PositionValue into its own files

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It's in Position.{h,cpp} because it represents a <position> in CSS, even
though it's currently named PositionValue to avoid collisions.
This commit is contained in:
Sam Atkins 2023-03-30 14:37:00 +01:00 • committed by Andreas Kling
parent bcebca62d3
commit d64ddeaec4
8 changed files with 165 additions and 133 deletions
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108
Userland/Libraries/LibWeb/CSS/Position.cpp Normal file
View file

@ -0,0 +1,108 @@
/*
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Position.h"
#include <LibGfx/Point.h>
#include <LibGfx/Rect.h>
#include <LibWeb/CSS/StyleValue.h>
namespace Web::CSS {
CSSPixelPoint PositionValue::resolved(Layout::Node const& node, CSSPixelRect const& rect) const
{
// Note: A preset + a none default x/y_relative_to is impossible in the syntax (and makes little sense)
CSSPixels x = horizontal_position.visit(
[&](HorizontalPreset preset) -> CSSPixels {
return rect.width() * [&] {
switch (preset) {
case HorizontalPreset::Left:
return 0.0f;
case HorizontalPreset::Center:
return 0.5f;
case HorizontalPreset::Right:
return 1.0f;
default:
VERIFY_NOT_REACHED();
}
}();
},
[&](LengthPercentage length_percentage) -> CSSPixels {
return length_percentage.resolved(node, Length::make_px(rect.width())).to_px(node);
});
CSSPixels y = vertical_position.visit(
[&](VerticalPreset preset) -> CSSPixels {
return rect.height() * [&] {
switch (preset) {
case VerticalPreset::Top:
return 0.0f;
case VerticalPreset::Center:
return 0.5f;
case VerticalPreset::Bottom:
return 1.0f;
default:
VERIFY_NOT_REACHED();
}
}();
},
[&](LengthPercentage length_percentage) -> CSSPixels {
return length_percentage.resolved(node, Length::make_px(rect.height())).to_px(node);
});
if (x_relative_to == HorizontalEdge::Right)
x = rect.width() - x;
if (y_relative_to == VerticalEdge::Bottom)
y = rect.height() - y;
return CSSPixelPoint { rect.x() + x, rect.y() + y };
}
ErrorOr<void> PositionValue::serialize(StringBuilder& builder) const
{
// Note: This means our serialization with simplify any with explicit edges that are just `top left`.
bool has_relative_edges = x_relative_to == HorizontalEdge::Right || y_relative_to == VerticalEdge::Bottom;
if (has_relative_edges)
TRY(builder.try_append(x_relative_to == HorizontalEdge::Left ? "left "sv : "right "sv));
TRY(horizontal_position.visit(
[&](HorizontalPreset preset) -> ErrorOr<void> {
return builder.try_append([&] {
switch (preset) {
case HorizontalPreset::Left:
return "left"sv;
case HorizontalPreset::Center:
return "center"sv;
case HorizontalPreset::Right:
return "right"sv;
default:
VERIFY_NOT_REACHED();
}
}());
},
[&](LengthPercentage length_percentage) -> ErrorOr<void> {
return builder.try_appendff(TRY(length_percentage.to_string()));
}));
TRY(builder.try_append(' '));
if (has_relative_edges)
TRY(builder.try_append(y_relative_to == VerticalEdge::Top ? "top "sv : "bottom "sv));
TRY(vertical_position.visit(
[&](VerticalPreset preset) -> ErrorOr<void> {
return builder.try_append([&] {
switch (preset) {
case VerticalPreset::Top:
return "top"sv;
case VerticalPreset::Center:
return "center"sv;
case VerticalPreset::Bottom:
return "bottom"sv;
default:
VERIFY_NOT_REACHED();
}
}());
},
[&](LengthPercentage length_percentage) -> ErrorOr<void> {
return builder.try_append(TRY(length_percentage.to_string()));
}));
return {};
}
}