79a630adef
This is a really starter attempt at formatting the grid. It doesn't yet take into account the computed_values of grid-template-rows, nor the values in grid-column-start and like CSS properties. But these changes are a start and make it so the examples in display-grid.html work. To be fleshed out further..
93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
/*
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* Copyright (c) 2022, Martin Falisse <mfalisse@outlook.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/GridFormattingContext.h>
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namespace Web::Layout {
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GridFormattingContext::GridFormattingContext(LayoutState& state, BlockContainer const& block_container, FormattingContext* parent)
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: BlockFormattingContext(state, block_container, parent)
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{
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}
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GridFormattingContext::~GridFormattingContext() = default;
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void GridFormattingContext::run(Box const& box, LayoutMode)
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{
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auto should_skip_is_anonymous_text_run = [&](Box& child_box) -> bool {
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if (child_box.is_anonymous() && !child_box.first_child_of_type<BlockContainer>()) {
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bool contains_only_white_space = true;
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child_box.for_each_in_subtree([&](auto const& node) {
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if (!is<TextNode>(node) || !static_cast<TextNode const&>(node).dom_node().data().is_whitespace()) {
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contains_only_white_space = false;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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if (contains_only_white_space)
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return true;
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}
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return false;
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};
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auto number_of_columns = (int)box.computed_values().grid_template_columns().size();
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struct GridRow {
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float height { 0 };
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Vector<Box&> boxes;
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};
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Vector<GridRow> grid_rows;
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auto current_column_count = 0;
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box.for_each_child_of_type<Box>([&](Box& child_box) {
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if (should_skip_is_anonymous_text_run(child_box))
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return IterationDecision::Continue;
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if (current_column_count == 0)
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grid_rows.append(GridRow());
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GridRow& grid_row = grid_rows.last();
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grid_row.boxes.append(child_box);
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auto& child_box_state = m_state.get_mutable(child_box);
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if (child_box_state.content_height() > grid_row.height)
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grid_row.height = child_box_state.content_height();
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(void)layout_inside(child_box, LayoutMode::Normal);
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if (child_box_state.content_height() > grid_row.height)
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grid_row.height = child_box_state.content_height();
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current_column_count++;
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if (current_column_count == number_of_columns)
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current_column_count = 0;
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return IterationDecision::Continue;
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});
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auto& box_state = m_state.get_mutable(box);
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float current_y_position = 0;
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current_column_count = 0;
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for (auto& grid_row : grid_rows) {
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for (auto& child_box : grid_row.boxes) {
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if (should_skip_is_anonymous_text_run(child_box))
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continue;
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auto& child_box_state = m_state.get_mutable(child_box);
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// FIXME: instead of dividing the parent width equally between the columns, should use
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// the values in the GridTrackSize objects.
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child_box_state.set_content_width(box_state.content_width() / number_of_columns);
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child_box_state.set_content_height(grid_row.height);
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child_box_state.offset = { current_column_count * (box_state.content_width() / number_of_columns), current_y_position };
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current_column_count++;
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if (current_column_count == number_of_columns) {
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current_y_position += grid_row.height;
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current_column_count = 0;
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}
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continue;
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}
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}
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}
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}
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