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LibWeb: Calculate sizes of Auto grid tracks

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martinfalisse 2022-09-07 15:48:40 +02:00 • committed by Andreas Kling
parent f558fd93b7
commit 58078c1f40
1 changed files with 42 additions and 0 deletions
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42
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -923,6 +923,48 @@ void GridFormattingContext::run(Box const& box, LayoutMode)
// track’s base size, restart this algorithm treating all such tracks as inflexible.
// 5. Return the hypothetical fr size.
// https://drafts.csswg.org/css-grid/#algo-stretch
// 12.8. Stretch auto Tracks
// When the content-distribution property of the grid container is normal or stretch in this axis,
// this step expands tracks that have an auto max track sizing function by dividing any remaining
// positive, definite free space equally amongst them. If the free space is indefinite, but the grid
// container has a definite min-width/height, use that size to calculate the free space for this
// step instead.
float used_horizontal_space = 0;
for (auto& grid_column : grid_columns) {
if (!(grid_column.max_track_sizing_function.is_length() && grid_column.max_track_sizing_function.length().is_auto()))
used_horizontal_space += grid_column.base_size;
}
float remaining_horizontal_space = box_state.content_width() - used_horizontal_space;
auto count_of_auto_max_column_tracks = 0;
for (auto& grid_column : grid_columns) {
if (grid_column.max_track_sizing_function.is_length() && grid_column.max_track_sizing_function.length().is_auto())
count_of_auto_max_column_tracks++;
}
for (auto& grid_column : grid_columns) {
if (grid_column.max_track_sizing_function.is_length() && grid_column.max_track_sizing_function.length().is_auto())
grid_column.base_size = max(grid_column.base_size, remaining_horizontal_space / count_of_auto_max_column_tracks);
}
float used_vertical_space = 0;
for (auto& grid_row : grid_rows) {
if (!(grid_row.max_track_sizing_function.is_length() && grid_row.max_track_sizing_function.length().is_auto()))
used_vertical_space += grid_row.base_size;
}
float remaining_vertical_space = box_state.content_height() - used_vertical_space;
auto count_of_auto_max_row_tracks = 0;
for (auto& grid_row : grid_rows) {
if (grid_row.max_track_sizing_function.is_length() && grid_row.max_track_sizing_function.length().is_auto())
count_of_auto_max_row_tracks++;
}
for (auto& grid_row : grid_rows) {
if (grid_row.max_track_sizing_function.is_length() && grid_row.max_track_sizing_function.length().is_auto())
grid_row.base_size = max(grid_row.base_size, remaining_vertical_space / count_of_auto_max_row_tracks);
}
}
}