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LibWeb: Express intrinsic size layout via size constraints
Previously, we had three layout modes: - Normal: - Everything uses the computed values from CSS. - MinContent: - Containing blocks act as if they have 0 width. - All line breaking opportunities are taken. - MaxContent: - Containing blocks act as if they have infinite width. - Only forced line breaks are accepted. The above was based on a set of misunderstandings of CSS sizing. A major problem with the above was that *all* containing blocks behaved differently during intrinsic size layout, not just the relevant one. With this patch there are only two layout modes: - Normal: - Everything uses the computed values from CSS. - IntrinsicSizeDetermination: - One or more boxes have size constraints applied. There are two size constraints per layout box, set here: - FormattingState::NodeState::width_constraint - FormattingState::NodeState::height_constraint They are of type SizeConstraint and can be one of None, MinContent, or MaxContent. The default is None. When performing an IntrinsicSizeDetermination layout, we now assign a size constraint to the box we're trying to determine the intrinsic size of, which is then honored by using two new helpers to query the dimensions of containing blocks: - FormattingContext::containing_block_width_for(Box) - FormattingContext::containing_block_height_for(Box) If there's a relevant constraint in effect on the Box, the size of its containing block is adjusted accordingly. This is essentially an implementation of the "available space" constraints from CSS-SIZING-3. I'm sure some things will break from this, and we'll have to deal with that separately. Spec: https://drafts.csswg.org/css-sizing-3/#available
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@ -119,7 +119,13 @@ void TableFormattingContext::calculate_column_widths(Box const& row, CSS::Length
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auto const& computed_values = cell.computed_values();
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auto specified_width = computed_values.width().resolved(cell, table_width).resolved(cell);
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compute_width(cell, specified_width.is_auto() ? LayoutMode::MinContent : LayoutMode::Normal);
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if (specified_width.is_auto()) {
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auto width = calculate_max_content_width(cell);
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cell_state.content_width = width;
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} else {
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compute_width(cell, LayoutMode::Normal);
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}
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(void)layout_inside(cell, LayoutMode::Normal);
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if (cell.colspan() == 1) {
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