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LibWeb: New start at layouting out the grid

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According to the spec it's necessary to:
1. Layout the cells in the grid
2. Find the sizes of the rows and columns

Since I had started to do this backwards, and as I expand in future
commits, I take here the opportunity to start with a clean state.

The occupation_grid keeps track of which cells in the grid have been
filled out.
This commit is contained in:
martinfalisse 2022-09-07 15:20:22 +02:00 committed by Andreas Kling
parent df88e2bd8e
commit a2ecb903af
Notes: sideshowbarker 2024-07-17 21:11:12 +09:00 
Author: https://github.com/martinfalisse
Commit: https://github.com/SerenityOS/serenity/commit/a2ecb903af
Pull-request: https://github.com/SerenityOS/serenity/pull/15155
Reviewed-by: https://github.com/MacDue
1 changed files with 6 additions and 55 deletions
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61
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -35,59 +35,10 @@ void GridFormattingContext::run(Box const& box, LayoutMode)
return false;
};
auto number_of_columns = (int)box.computed_values().grid_template_columns().size();
struct GridRow {
float height { 0 };
Vector<Box&> boxes;
};
Vector<GridRow> grid_rows;
auto current_column_count = 0;
box.for_each_child_of_type<Box>([&](Box& child_box) {
if (should_skip_is_anonymous_text_run(child_box))
return IterationDecision::Continue;
if (current_column_count == 0)
grid_rows.append(GridRow());
GridRow& grid_row = grid_rows.last();
grid_row.boxes.append(child_box);
auto& child_box_state = m_state.get_mutable(child_box);
if (child_box_state.content_height() > grid_row.height)
grid_row.height = child_box_state.content_height();
(void)layout_inside(child_box, LayoutMode::Normal);
if (child_box_state.content_height() > grid_row.height)
grid_row.height = child_box_state.content_height();
current_column_count++;
if (current_column_count == number_of_columns)
current_column_count = 0;
return IterationDecision::Continue;
});
auto& box_state = m_state.get_mutable(box);
float current_y_position = 0;
current_column_count = 0;
for (auto& grid_row : grid_rows) {
for (auto& child_box : grid_row.boxes) {
if (should_skip_is_anonymous_text_run(child_box))
continue;
auto& child_box_state = m_state.get_mutable(child_box);
// FIXME: instead of dividing the parent width equally between the columns, should use
// the values in the GridTrackSize objects.
child_box_state.set_content_width(box_state.content_width() / number_of_columns);
child_box_state.set_content_height(grid_row.height);
child_box_state.offset = { current_column_count * (box_state.content_width() / number_of_columns), current_y_position };
current_column_count++;
if (current_column_count == number_of_columns) {
current_y_position += grid_row.height;
current_column_count = 0;
}
continue;
}
}
}
Vector<Vector<bool>> occupation_grid;
Vector<bool> occupation_grid_row;
for (int column_index = 0; column_index < max((int)box.computed_values().grid_template_columns().size(), 1); column_index++)
occupation_grid_row.append(false);
for (int row_index = 0; row_index < max((int)box.computed_values().grid_template_rows().size(), 1); row_index++)
occupation_grid.append(occupation_grid_row);
}