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LibWeb: Implement more of "Expand Flexible Tracks" in GFC

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Implements "Otherwise, if the free space is an indefinite length:" from
the spec.
This commit is contained in:
Aliaksandr Kalenik 2023-05-16 14:07:51 +03:00 • committed by Andreas Kling
parent 2e13f65ff4
commit a3759b6e76
5 changed files with 75 additions and 19 deletions
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52
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -1055,16 +1055,15 @@ void GridFormattingContext::expand_flexible_tracks(AvailableSpace const& availab
// the available space.
auto& tracks_and_gaps = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
auto find_the_size_of_an_fr = [&]() -> CSSPixels {
auto find_the_size_of_an_fr = [&](Vector<TemporaryTrack&> tracks, CSSPixels space_to_fill) -> CSSPixels {
// https://www.w3.org/TR/css-grid-2/#algo-find-fr-size
VERIFY(available_size.is_definite());
// 1. Let leftover space be the space to fill minus the base sizes of the non-flexible grid tracks.
auto leftover_space = available_size.to_px();
for (auto& track : tracks_and_gaps) {
auto leftover_space = space_to_fill;
for (auto& track : tracks) {
if (!track.max_track_sizing_function.is_flexible_length()) {
leftover_space -= track.base_size;
}
@ -1073,9 +1072,9 @@ void GridFormattingContext::expand_flexible_tracks(AvailableSpace const& availab
// 2. Let flex factor sum be the sum of the flex factors of the flexible tracks.
// If this value is less than 1, set it to 1 instead.
auto flex_factor_sum = 0;
for (auto& track : tracks_and_gaps) {
for (auto& track : tracks) {
if (track.max_track_sizing_function.is_flexible_length())
flex_factor_sum++;
flex_factor_sum += track.max_track_sizing_function.flexible_length();
}
if (flex_factor_sum < 1)
flex_factor_sum = 1;
@ -1101,10 +1100,43 @@ void GridFormattingContext::expand_flexible_tracks(AvailableSpace const& availab
} else if (free_space.is_definite()) {
// The used flex fraction is the result of finding the size of an fr using all of the grid tracks and a space
// to fill of the available grid space.
return find_the_size_of_an_fr();
return find_the_size_of_an_fr(tracks_and_gaps, available_size.to_px());
} else {
// FIXME
return CSSPixels(0);
// Otherwise, if the free space is an indefinite length:
// The used flex fraction is the maximum of:
CSSPixels result = 0;
// For each flexible track, if the flexible track’s flex factor is greater than one, the result of dividing
// the track’s base size by its flex factor; otherwise, the track’s base size.
for (auto& track : tracks) {
if (track.max_track_sizing_function.is_flexible_length()) {
if (track.max_track_sizing_function.flexible_length() > 1) {
result = max(result, track.base_size / track.max_track_sizing_function.flexible_length());
} else {
result = max(result, track.base_size);
}
}
}
// For each grid item that crosses a flexible track, the result of finding the size of an fr using all the
// grid tracks that the item crosses and a space to fill of the item’s max-content contribution.
for (auto& item : m_grid_items) {
Vector<TemporaryTrack&> spanned_tracks;
bool crosses_flexible_track = false;
for (size_t span = 0; span < item.span(dimension); span++) {
// FIXME: This check should not be need if grid item positioning works correct
if (item.raw_position(dimension) + span >= tracks.size())
break;
auto& track = tracks[item.raw_position(dimension) + span];
spanned_tracks.append(track);
if (track.max_track_sizing_function.is_flexible_length())
crosses_flexible_track = true;
}
if (crosses_flexible_track)
result = max(result, find_the_size_of_an_fr(spanned_tracks, calculate_max_content_size(item, dimension)));
}
return result;
}
}();