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serenity/Libraries/LibWeb/Layout/LayoutTableRow.cpp
Andreas Kling 7fc988b919 LibWeb: Start working on supporting fixed table layouts
Sometimes people make tables with a specific width. In those cases,
we can't just use the auto-sizing algorithm, but instead have to
respect whatever width the content specifies.

This is a bit rickety right now, since we don't implement generation
of anonymous table boxes.

The basic mechanism here is that block layout (which table-cell uses)
now has a virtual way of asking for the width of the logical containing
block. This is necessary as table-row does not produce a block-level
element and so was previously unable to provide a containing block
width for table-cell layout.

If the table has a non-auto specified width, we now interpret that as
a request to use fixed table layout. This will evolve over time. :^)
2020-06-28 15:13:56 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibWeb/DOM/Element.h>
#include <LibWeb/Layout/LayoutTable.h>
#include <LibWeb/Layout/LayoutTableCell.h>
#include <LibWeb/Layout/LayoutTableRow.h>
namespace Web {
LayoutTableRow::LayoutTableRow(Document& document, const Element& element, NonnullRefPtr<StyleProperties> style)
: LayoutBox(document, &element, move(style))
{
}
LayoutTableRow::~LayoutTableRow()
{
}
void LayoutTableRow::layout(LayoutMode)
{
}
void LayoutTableRow::calculate_column_widths(Vector<float>& column_widths)
{
size_t column_index = 0;
for_each_child_of_type<LayoutTableCell>([&](auto& cell) {
auto* table = first_ancestor_of_type<LayoutTable>();
if (table && !table->style().width().is_undefined_or_auto()) {
cell.layout(LayoutMode::Default);
} else {
cell.layout(LayoutMode::OnlyRequiredLineBreaks);
}
column_widths[column_index] = max(column_widths[column_index], cell.width());
column_index += cell.colspan();
});
}
void LayoutTableRow::layout_row(const Vector<float>& column_widths)
{
size_t column_index = 0;
float tallest_cell_height = 0;
float content_width = 0;
for_each_child_of_type<LayoutTableCell>([&](auto& cell) {
cell.set_offset(effective_offset().translated(content_width, 0));
size_t cell_colspan = cell.colspan();
for (size_t i = 0; i < cell_colspan; ++i)
content_width += column_widths[column_index++];
tallest_cell_height = max(tallest_cell_height, cell.height());
});
auto* table = first_ancestor_of_type<LayoutTable>();
if (table && !table->style().width().is_undefined_or_auto()) {
set_width(table->width());
} else {
set_width(content_width);
}
set_height(tallest_cell_height);
}
}