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LibWeb: Calculate sizes of known grid track sizes

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Calculate the sizes of grid tracks for which there is a clear size
(length or percentage has been specified).
This commit is contained in:
martinfalisse 2022-09-07 15:45:10 +02:00 committed by Andreas Kling
parent 6b649b6343
commit b7d053421e
Notes: sideshowbarker 2024-07-17 07:11:37 +09:00 
Author: https://github.com/martinfalisse
Commit: https://github.com/SerenityOS/serenity/commit/b7d053421e
Pull-request: https://github.com/SerenityOS/serenity/pull/15155
Reviewed-by: https://github.com/MacDue
1 changed files with 118 additions and 0 deletions
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118
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -407,6 +407,124 @@ void GridFormattingContext::run(Box const& box, LayoutMode)
grid_columns.append({ CSS::GridTrackSize::make_auto(), CSS::GridTrackSize::make_auto() });
for (int row_index = grid_rows.size(); row_index < static_cast<int>(occupation_grid.size()); row_index++)
grid_rows.append({ CSS::GridTrackSize::make_auto(), CSS::GridTrackSize::make_auto() });
// https://drafts.csswg.org/css-grid/#algo-overview
// 12.1. Grid Sizing Algorithm
// FIXME: Deals with subgrids, min-content, and justify-content.. not implemented yet
// https://drafts.csswg.org/css-grid/#algo-track-sizing
// 12.3. Track Sizing Algorithm
// The remainder of this section is the track sizing algorithm, which calculates from the min and
// max track sizing functions the used track size. Each track has a base size, a <length> which
// grows throughout the algorithm and which will eventually be the track’s final size, and a growth
// limit, a <length> which provides a desired maximum size for the base size. There are 5 steps:
// 1. Initialize Track Sizes
// 2. Resolve Intrinsic Track Sizes
// 3. Maximize Tracks
// 4. Expand Flexible Tracks
// 5. [[#algo-stretch|Expand Stretched auto Tracks]]
// https://drafts.csswg.org/css-grid/#algo-init
// 12.4. Initialize Track Sizes
// Initialize each track’s base size and growth limit.
for (auto& grid_column : grid_columns) {
// For each track, if the track’s min track sizing function is:
switch (grid_column.min_track_sizing_function.type()) {
// - A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial base size.
// Indefinite lengths cannot occur, as they’re treated as auto.
case CSS::GridTrackSize::Type::Length:
if (!grid_column.min_track_sizing_function.length().is_auto())
grid_column.base_size = grid_column.min_track_sizing_function.length().to_px(box);
break;
case CSS::GridTrackSize::Type::Percentage:
grid_column.base_size = grid_column.min_track_sizing_function.percentage().as_fraction() * box_state.content_width();
break;
// - An intrinsic sizing function
// Use an initial base size of zero.
case CSS::GridTrackSize::Type::FlexibleLength:
break;
default:
VERIFY_NOT_REACHED();
}
// For each track, if the track’s max track sizing function is:
switch (grid_column.max_track_sizing_function.type()) {
// - A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial growth limit.
case CSS::GridTrackSize::Type::Length:
if (!grid_column.max_track_sizing_function.length().is_auto())
grid_column.growth_limit = grid_column.max_track_sizing_function.length().to_px(box);
else
// - An intrinsic sizing function
// Use an initial growth limit of infinity.
grid_column.growth_limit = -1;
break;
case CSS::GridTrackSize::Type::Percentage:
grid_column.growth_limit = grid_column.max_track_sizing_function.percentage().as_fraction() * box_state.content_width();
break;
// - A flexible sizing function
// Use an initial growth limit of infinity.
case CSS::GridTrackSize::Type::FlexibleLength:
grid_column.growth_limit = -1;
break;
default:
VERIFY_NOT_REACHED();
}
}
// Initialize each track’s base size and growth limit.
for (auto& grid_row : grid_rows) {
// For each track, if the track’s min track sizing function is:
switch (grid_row.min_track_sizing_function.type()) {
// - A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial base size.
// Indefinite lengths cannot occur, as they’re treated as auto.
case CSS::GridTrackSize::Type::Length:
if (!grid_row.min_track_sizing_function.length().is_auto())
grid_row.base_size = grid_row.min_track_sizing_function.length().to_px(box);
break;
case CSS::GridTrackSize::Type::Percentage:
grid_row.base_size = grid_row.min_track_sizing_function.percentage().as_fraction() * box_state.content_height();
break;
// - An intrinsic sizing function
// Use an initial base size of zero.
case CSS::GridTrackSize::Type::FlexibleLength:
break;
default:
VERIFY_NOT_REACHED();
}
// For each track, if the track’s max track sizing function is:
switch (grid_row.max_track_sizing_function.type()) {
// - A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial growth limit.
case CSS::GridTrackSize::Type::Length:
if (!grid_row.max_track_sizing_function.length().is_auto())
grid_row.growth_limit = grid_row.max_track_sizing_function.length().to_px(box);
else
// - An intrinsic sizing function
// Use an initial growth limit of infinity.
grid_row.growth_limit = -1;
break;
case CSS::GridTrackSize::Type::Percentage:
grid_row.growth_limit = grid_row.max_track_sizing_function.percentage().as_fraction() * box_state.content_height();
break;
// - A flexible sizing function
// Use an initial growth limit of infinity.
case CSS::GridTrackSize::Type::FlexibleLength:
grid_row.growth_limit = -1;
break;
default:
VERIFY_NOT_REACHED();
}
}
// FIXME: In all cases, if the growth limit is less than the base size, increase the growth limit to match
// the base size.
}
}