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LibWeb: Consolidate track sizing code for rows and columns in GFC

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Although the algorithm for sizing tracks (rows or columns) is defined
once for both dimensions in the specification
(https://www.w3.org/TR/css-grid-2/#algo-track-sizing), we have
implemented it twice separately for sizing rows and columns.

In addition to code duplication, another issue is that these
implementations of the same algorithm have already diverged in some
places, and this divergence is likely to become even worse as our
implementation evolves.

This change unifies code for both dimension into one method that runs
track sizing.

While this change brings a bit of collateral damange (border.html and
minmax.html got changes in layout snaphots) it ultimately brings more
benefits because now we can evolve layout for both rows and colums
without duplicating the code :)
This commit is contained in:
Aliaksandr Kalenik 2023-05-06 04:22:35 +03:00 • committed by Andreas Kling
parent 4c17f22735
commit ced862e16f
4 changed files with 252 additions and 691 deletions
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755
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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File diff suppressed because it is too large Load diff

22
Userland/Libraries/LibWeb/Layout/GridFormattingContext.h
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@ -11,6 +11,11 @@
namespace Web::Layout {
enum class GridDimension {
Row,
Column
};
class OccupationGrid {
public:
OccupationGrid(int column_count, int row_count);
@ -45,8 +50,8 @@ public:
int raw_row_span() { return m_row_span; }
int raw_column_span() { return m_column_span; }
int gap_adjusted_row(Box const& parent_box) const;
int gap_adjusted_column(Box const& parent_box) const;
int gap_adjusted_row(Box const& grid_box) const;
int gap_adjusted_column(Box const& grid_box) const;
private:
JS::NonnullGCPtr<Box const> m_box;
@ -65,6 +70,8 @@ public:
virtual CSSPixels automatic_content_width() const override;
virtual CSSPixels automatic_content_height() const override;
Box const& grid_container() const { return context_box(); }
private:
CSSPixels m_automatic_content_height { 0 };
bool is_auto_positioned_row(CSS::GridTrackPlacement const&, CSS::GridTrackPlacement const&) const;
@ -138,13 +145,11 @@ private:
Vector<GridItem> m_grid_items;
Vector<JS::NonnullGCPtr<Box const>> m_boxes_to_place;
CSSPixels get_free_space_x(AvailableSpace const& available_space);
CSSPixels get_free_space_y(Box const&);
CSSPixels get_free_space(AvailableSize const& available_size, Vector<TemporaryTrack> const& tracks) const;
int get_line_index_by_line_name(String const& line_name, CSS::GridTrackSizeList);
CSSPixels resolve_definite_track_size(CSS::GridSize const&, AvailableSpace const&, Box const&);
size_t count_of_gap_columns();
size_t count_of_gap_rows();
size_t count_of_gap_tracks(Vector<TemporaryTrack> const& tracks) const;
CSSPixels resolve_size(CSS::Size const&, AvailableSize const&, Box const&);
int count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS::ExplicitGridTrack> const& track_list, AvailableSpace const&, Box const&);
int get_count_of_tracks(Vector<CSS::ExplicitGridTrack> const&, AvailableSpace const&, Box const&);
@ -158,10 +163,9 @@ private:
void place_item_with_no_declared_position(Box const& child_box, int& auto_placement_cursor_x, int& auto_placement_cursor_y);
void initialize_grid_tracks(Box const&, AvailableSpace const&, int column_count, int row_count);
void calculate_sizes_of_columns(Box const&, AvailableSpace const&);
void calculate_sizes_of_rows(Box const&);
void run_track_sizing(GridDimension const dimension, AvailableSpace const& available_space, Vector<TemporaryTrack>& tracks);
CSSPixels content_based_minimum_height(GridItem const&, Box const& parent_box);
CSSPixels content_based_minimum_height(GridItem const&);
};
}