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LibWeb: Add support for table caption

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Adds layout support and the CSS caption-side property.
This commit is contained in:
Andi Gallo 2023-06-07 02:10:55 +00:00 • committed by Andreas Kling
parent 656f72adc0
commit 940d9b98ae
15 changed files with 353 additions and 21 deletions
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59
Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
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@ -7,6 +7,7 @@
#include <LibWeb/DOM/Node.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/HTMLTableCellElement.h>
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/InlineFormattingContext.h>
#include <LibWeb/Layout/TableFormattingContext.h>
@ -60,6 +61,34 @@ static void for_each_child_box_matching(Box const& parent, Matcher matcher, Call
});
}
CSSPixels TableFormattingContext::run_caption_layout(LayoutMode layout_mode, CSS::CaptionSide phase)
{
CSSPixels caption_height = 0;
for (auto* child = table_box().first_child(); child; child = child->next_sibling()) {
if (!child->display().is_table_caption() || child->computed_values().caption_side() != phase) {
continue;
}
// The caption boxes are principal block-level boxes that retain their own content, padding, margin, and border areas,
// and are rendered as normal block boxes inside the table wrapper box, as described in https://www.w3.org/TR/CSS22/tables.html#model
auto caption_context = make<BlockFormattingContext>(m_state, *verify_cast<BlockContainer>(child), this);
caption_context->run(table_box(), layout_mode, *m_available_space);
VERIFY(child->is_box());
auto const& child_box = static_cast<Box const&>(*child);
// FIXME: Since caption only has inline children, BlockFormattingContext doesn't resolve the vertical metrics.
// We need to do it manually here.
caption_context->resolve_vertical_box_model_metrics(child_box);
auto const& caption_state = m_state.get(child_box);
if (phase == CSS::CaptionSide::Top) {
m_state.get_mutable(table_box()).set_content_y(caption_state.margin_box_height());
} else {
m_state.get_mutable(child_box).set_content_y(
m_state.get(table_box()).margin_box_height() + caption_state.margin_box_top());
}
caption_height += caption_state.margin_box_height();
}
return caption_height;
}
void TableFormattingContext::calculate_row_column_grid(Box const& box)
{
// Implements https://html.spec.whatwg.org/multipage/tables.html#forming-a-table
@ -224,6 +253,21 @@ void TableFormattingContext::compute_table_measures()
}
}
CSSPixels TableFormattingContext::compute_capmin()
{
// The caption width minimum (CAPMIN) is the largest of the table captions min-content contribution:
// https://drafts.csswg.org/css-tables-3/#computing-the-table-width
CSSPixels capmin = 0;
for (auto* child = table_box().first_child(); child; child = child->next_sibling()) {
if (!child->display().is_table_caption()) {
continue;
}
VERIFY(child->is_box());
capmin = max(calculate_min_content_width(static_cast<Box const&>(*child)), capmin);
}
return capmin;
}
void TableFormattingContext::compute_table_width()
{
// https://drafts.csswg.org/css-tables-3/#computing-the-table-width
@ -253,7 +297,7 @@ void TableFormattingContext::compute_table_width()
}
// The used min-width of a table is the greater of the resolved min-width, CAPMIN, and GRIDMIN.
auto used_min_width = grid_min;
auto used_min_width = max(grid_min, compute_capmin());
if (!computed_values.min_width().is_auto()) {
used_min_width = max(used_min_width, computed_values.min_width().to_px(table_box(), width_of_table_wrapper_containing_block));
}
@ -616,7 +660,7 @@ void TableFormattingContext::position_row_boxes(CSSPixels& total_content_height)
{
auto const& table_state = m_state.get(table_box());
CSSPixels row_top_offset = table_state.border_top + table_state.padding_top;
CSSPixels row_top_offset = table_state.offset.y() + table_state.padding_top;
CSSPixels row_left_offset = table_state.border_left + table_state.padding_left;
for (size_t y = 0; y < m_rows.size(); y++) {
auto& row = m_rows[y];
@ -655,7 +699,7 @@ void TableFormattingContext::position_row_boxes(CSSPixels& total_content_height)
row_group_top_offset += row_group_height;
});
total_content_height = max(row_top_offset, row_group_top_offset) - table_state.border_top - table_state.padding_top;
total_content_height = max(row_top_offset, row_group_top_offset) - table_state.offset.y() - table_state.padding_top;
}
void TableFormattingContext::position_cell_boxes()
@ -727,6 +771,8 @@ void TableFormattingContext::run(Box const& box, LayoutMode layout_mode, Availab
{
m_available_space = available_space;
auto total_captions_height = run_caption_layout(layout_mode, CSS::CaptionSide::Top);
CSSPixels total_content_height = 0;
// Determine the number of rows/columns the table requires.
@ -755,6 +801,13 @@ void TableFormattingContext::run(Box const& box, LayoutMode layout_mode, Availab
m_state.get_mutable(table_box()).set_content_height(total_content_height);
total_captions_height += run_caption_layout(layout_mode, CSS::CaptionSide::Bottom);
// Table captions are positioned between the table margins and its borders (outside the grid box borders) as described in
// https://www.w3.org/TR/css-tables-3/#bounding-box-assignment
// A visual representation of this model can be found at https://www.w3.org/TR/css-tables-3/images/table_container.png
m_state.get_mutable(table_box()).margin_bottom += total_captions_height;
// FIXME: This is a total hack, we should respect the 'height' property.
m_automatic_content_height = total_content_height;
}