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LibWeb: Position abspos items inside grid relative to their grid area

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Since grid item's containing block is not grid container but
corresponding grid area, it affect positioning of abspos items.
This commit is contained in:
Aliaksandr Kalenik 2023-10-30 21:52:13 +01:00 • committed by Andreas Kling
parent 44001d2178
commit 141f56accc
3 changed files with 91 additions and 2 deletions
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59
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -1958,6 +1958,56 @@ void GridFormattingContext::layout_absolutely_positioned_element(Box const& box,
auto& box_state = m_state.get_mutable(box);
auto const& computed_values = box.computed_values();
auto const& grid_row_start = computed_values.grid_row_start();
auto const& grid_row_end = computed_values.grid_row_end();
auto const& grid_column_start = computed_values.grid_column_start();
auto const& grid_column_end = computed_values.grid_column_end();
int row_start = 0, row_end = 0, column_start = 0, column_end = 0;
if (grid_column_end.has_identifier()) {
if (auto maybe_grid_area = m_grid_areas.get(grid_column_end.identifier()); maybe_grid_area.has_value())
column_end = maybe_grid_area->column_end;
else if (auto line_name_index = get_line_index_by_line_name(grid_column_end.identifier(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
column_end = line_name_index;
else
column_end = 1;
column_start = column_end - 1;
}
if (grid_column_start.has_identifier()) {
if (auto maybe_grid_area = m_grid_areas.get(grid_column_start.identifier()); maybe_grid_area.has_value())
column_start = maybe_grid_area->column_start;
else if (auto line_name_index = get_line_index_by_line_name(grid_column_start.identifier(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
column_start = line_name_index;
else
column_start = 0;
}
if (grid_row_end.has_identifier()) {
if (auto maybe_grid_area = m_grid_areas.get(grid_row_end.identifier()); maybe_grid_area.has_value())
row_end = maybe_grid_area->row_end;
else if (auto line_name_index = get_line_index_by_line_name(grid_row_end.identifier(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
row_end = line_name_index;
else
row_end = 1;
row_start = row_end - 1;
}
if (grid_row_start.has_identifier()) {
if (auto maybe_grid_area = m_grid_areas.get(grid_row_start.identifier()); maybe_grid_area.has_value())
row_start = maybe_grid_area->row_start;
else if (auto line_name_index = get_line_index_by_line_name(grid_row_start.identifier(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
row_start = line_name_index;
else
row_start = 0;
}
size_t row_span = row_end - row_start;
size_t column_span = column_end - column_start;
GridItem item { box, row_start, row_span, column_start, column_span };
// The border computed values are not changed by the compute_height & width calculations below.
// The spec only adjusts and computes sizes, insets and margins.
box_state.border_left = box.computed_values().border_left().width;
@ -2029,9 +2079,14 @@ void GridFormattingContext::layout_absolutely_positioned_element(Box const& box,
}
}
// If an absolutely positioned element’s containing block is generated by a grid container,
// the containing block corresponds to the grid area determined by its grid-placement properties.
// The offset properties (top/right/bottom/left) then indicate offsets inwards from the corresponding
// edges of this containing block, as normal.
CSSPixelPoint used_offset;
used_offset.set_x(box_state.inset_left + box_state.margin_box_left());
used_offset.set_y(box_state.inset_top + box_state.margin_box_top());
auto grid_area_offset = get_grid_area_rect(item);
used_offset.set_x(grid_area_offset.x() + box_state.inset_left + box_state.margin_box_left());
used_offset.set_y(grid_area_offset.y() + box_state.inset_top + box_state.margin_box_top());
// NOTE: Absolutely positioned boxes are relative to the *padding edge* of the containing block.
used_offset.translate_by(-containing_block_state.padding_left, -containing_block_state.padding_top);