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LibWeb: Support auto-fill for rows in GFC

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This change fixes the function that calculates the number of auto-fill
tracks, ensuring it uses height when applied to rows, instead of
assuming that it always operates on columns.
This commit is contained in:
Aliaksandr Kalenik 2024-01-07 10:32:40 +01:00 • committed by Andreas Kling
parent 75fc51bb67
commit 903d3c92c8
4 changed files with 62 additions and 9 deletions
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30
Tests/LibWeb/Layout/expected/grid/auto-fill-rows.txt Normal file
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@ -0,0 +1,30 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x250.9375 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x234.9375 children: not-inline
Box <div.grid-container> at (8,8) content-size 784x234.9375 [GFC] children: not-inline
BlockContainer <div> at (8,8) content-size 784x200 [BFC] children: inline
line 0 width: 46.71875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 6, rect: [8,8 46.71875x17.46875]
"Item 1"
TextNode <#text>
BlockContainer <div> at (8,208) content-size 784x17.46875 [BFC] children: inline
line 0 width: 49.1875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 6, rect: [8,208 49.1875x17.46875]
"Item 2"
TextNode <#text>
BlockContainer <div> at (8,225.46875) content-size 784x17.46875 [BFC] children: inline
line 0 width: 49.46875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 6, rect: [8,225.46875 49.46875x17.46875]
"Item 3"
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x250.9375]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x234.9375]
PaintableBox (Box<DIV>.grid-container) [8,8 784x234.9375]
PaintableWithLines (BlockContainer<DIV>) [8,8 784x200]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>) [8,208 784x17.46875]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>) [8,225.46875 784x17.46875]
TextPaintable (TextNode<#text>)

9
Tests/LibWeb/Layout/input/grid/auto-fill-rows.html Normal file
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@ -0,0 +1,9 @@
<!DOCTYPE html><html><style>
* {
outline: 1px solid black;
}
.grid-container {
display: grid;
grid-template-rows: repeat(auto-fill, 200px);
}
</style><div class="grid-container"><div>Item 1</div><div>Item 2</div><div>Item 3</div></html>

30
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -71,7 +71,7 @@ CSSPixels GridFormattingContext::resolve_definite_track_size(CSS::GridSize const
return 0;
}
int GridFormattingContext::count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS::ExplicitGridTrack> const& track_list)
int GridFormattingContext::count_of_repeated_auto_fill_or_fit_tracks(GridDimension dimension)
{
// https://www.w3.org/TR/css-grid-2/#auto-repeat
// 7.2.3.2. Repeat-to-fill: auto-fill and auto-fit repetitions
@ -84,6 +84,8 @@ int GridFormattingContext::count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS:
// repetitions is the largest possible positive integer that does not cause the grid to overflow the
// content box of its grid container
auto const& grid_computed_values = grid_container().computed_values();
auto const& track_list = dimension == GridDimension::Row ? grid_computed_values.grid_template_rows().track_list() : grid_computed_values.grid_template_columns().track_list();
CSSPixels sum_of_grid_track_sizes = 0;
// (treating each track as its max track sizing function if that is definite or its minimum track sizing
// function otherwise, flooring the max track sizing function by the min track sizing function if both
@ -103,12 +105,24 @@ int GridFormattingContext::count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS:
}
}
auto free_space = get_free_space(*m_available_space, GridDimension::Column).to_px_or_zero();
auto const& column_gap = grid_container().computed_values().column_gap();
free_space -= repeat_track_list.size() * column_gap.to_px(grid_container(), m_available_space->width.to_px_or_zero());
if (free_space <= 0 || sum_of_grid_track_sizes == 0)
if (sum_of_grid_track_sizes == 0)
return 0;
return (free_space / sum_of_grid_track_sizes).to_int();
auto const& available_size = dimension == GridDimension::Column ? m_available_space->width : m_available_space->height;
auto free_space = get_free_space(*m_available_space, dimension).to_px_or_zero();
auto const& gap = dimension == GridDimension::Column ? grid_computed_values.column_gap() : grid_computed_values.row_gap();
free_space -= repeat_track_list.size() * gap.to_px(grid_container(), available_size.to_px_or_zero());
// If any number of repetitions would overflow, then 1 repetition.
if (free_space <= sum_of_grid_track_sizes) {
return 1;
}
// Otherwise, if the grid container has a definite min size in the relevant axis, the number of repetitions is the
// smallest possible positive integer that fulfills that minimum requirement
else if (available_size.is_definite()) {
return max(1, (free_space / sum_of_grid_track_sizes).to_int());
}
// Otherwise, the specified track list repeats only once.
return 1;
// For the purpose of finding the number of auto-repeated tracks in a standalone axis, the UA must
// floor the track size to a UA-specified value to avoid division by zero. It is suggested that this
@ -618,7 +632,7 @@ void GridFormattingContext::initialize_grid_tracks_from_definition(GridDimension
int repeat_count = 1;
if (track_definition.is_repeat()) {
if (track_definition.repeat().is_auto_fill() || track_definition.repeat().is_auto_fit())
repeat_count = count_of_repeated_auto_fill_or_fit_tracks(tracks_definition);
repeat_count = count_of_repeated_auto_fill_or_fit_tracks(dimension);
else
repeat_count = track_definition.repeat().repeat_count();
}
@ -2266,7 +2280,7 @@ void GridFormattingContext::init_grid_lines(GridDimension dimension)
} else if (explicit_track.is_repeat()) {
int repeat_count = 0;
if (explicit_track.repeat().is_auto_fill() || explicit_track.repeat().is_auto_fit())
repeat_count = count_of_repeated_auto_fill_or_fit_tracks(lines_definition.track_list());
repeat_count = count_of_repeated_auto_fill_or_fit_tracks(dimension);
else
repeat_count = explicit_track.repeat().repeat_count();
auto const& repeat_track = explicit_track.repeat();

2
Userland/Libraries/LibWeb/Layout/GridFormattingContext.h
View file

@ -244,7 +244,7 @@ private:
Optional<int> get_line_index_by_line_name(GridDimension dimension, String const&);
CSSPixels resolve_definite_track_size(CSS::GridSize const&, AvailableSpace const&);
int count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS::ExplicitGridTrack> const& track_list);
int count_of_repeated_auto_fill_or_fit_tracks(GridDimension);
void build_grid_areas();