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LibWeb: Narrow width of boxes that create BFC to avoid overlap of float

Browse source 
https://www.w3.org/TR/CSS22/visuren.html#floats says that when a box
establishes BFC it should not overlap with floats. The way to avoid
overlaps is up to implementor. This change implements avoiding overlap
by narrowing width of a box because it seems like what other engines
do (in the scenarios I tested).
This commit is contained in:
Aliaksandr Kalenik 2023-05-04 06:34:35 +03:00 • committed by Andreas Kling
parent bf41af6b9d
commit 853ecb8d8e
3 changed files with 71 additions and 10 deletions
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36
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -115,12 +115,28 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
return;
}
auto remaining_available_space = available_space;
if (available_space.width.is_definite() && creates_block_formatting_context(box)) {
// 9.5 Floats
// The border box of a table, a block-level replaced element, or an element in the normal flow that establishes a
// new block formatting context (such as an element with 'overflow' other than 'visible') must not overlap the margin
// box of any floats in the same block formatting context as the element itself. If necessary, implementations should
// clear the said element by placing it below any preceding floats, but may place it adjacent to such floats if there is
// sufficient space. They may even make the border box of said element narrower than defined by section 10.3.3.
// CSS2 does not define when a UA may put said element next to the float or by how much said element may
// become narrower.
auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(box, root(), m_state);
auto space = space_used_by_floats(box_in_root_rect.y());
auto remaining_width = available_space.width.to_px() - space.left - space.right;
remaining_available_space.width = AvailableSize::make_definite(remaining_width);
}
if (is<ReplacedBox>(box)) {
// FIXME: This should not be done *by* ReplacedBox
auto& replaced = verify_cast<ReplacedBox>(box);
// FIXME: This const_cast is gross.
const_cast<ReplacedBox&>(replaced).prepare_for_replaced_layout();
compute_width_for_block_level_replaced_element_in_normal_flow(replaced, available_space);
compute_width_for_block_level_replaced_element_in_normal_flow(replaced, remaining_available_space);
// NOTE: We don't return here.
}
@ -131,8 +147,8 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
auto const& computed_values = box.computed_values();
auto width_of_containing_block = available_space.width.to_px();
auto width_of_containing_block_as_length_for_resolve = available_space.width.is_definite() ? CSS::Length::make_px(width_of_containing_block) : CSS::Length::make_px(0);
auto width_of_containing_block = remaining_available_space.width.to_px();
auto width_of_containing_block_as_length_for_resolve = remaining_available_space.width.is_definite() ? CSS::Length::make_px(width_of_containing_block) : CSS::Length::make_px(0);
auto zero_value = CSS::Length::make_px(0);
@ -216,10 +232,10 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
return CSS::Length::make_px(box_state.content_width());
}
if (is<TableWrapper>(box))
return CSS::Length::make_px(compute_width_for_table_wrapper(box, available_space));
if (should_treat_width_as_auto(box, available_space))
return CSS::Length::make_px(compute_width_for_table_wrapper(box, remaining_available_space));
if (should_treat_width_as_auto(box, remaining_available_space))
return CSS::Length::make_auto();
return calculate_inner_width(box, available_space.width, computed_values.width());
return calculate_inner_width(box, remaining_available_space.width, computed_values.width());
}();
// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
@ -228,8 +244,8 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!computed_values.max_width().is_none()) {
auto max_width = calculate_inner_width(box, available_space.width, computed_values.max_width());
auto used_width_px = used_width.is_auto() ? available_space.width.to_px() : used_width.to_px(box);
auto max_width = calculate_inner_width(box, remaining_available_space.width, computed_values.max_width());
auto used_width_px = used_width.is_auto() ? remaining_available_space.width.to_px() : used_width.to_px(box);
if (used_width_px > max_width.to_px(box)) {
used_width = try_compute_width(max_width);
}
@ -238,8 +254,8 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
// but this time using the value of 'min-width' as the computed value for 'width'.
if (!computed_values.min_width().is_auto()) {
auto min_width = calculate_inner_width(box, available_space.width, computed_values.min_width());
auto used_width_px = used_width.is_auto() ? available_space.width.to_px() : used_width.to_px(box);
auto min_width = calculate_inner_width(box, remaining_available_space.width, computed_values.min_width());
auto used_width_px = used_width.is_auto() ? remaining_available_space.width.to_px() : used_width.to_px(box);
if (used_width_px < min_width.to_px(box)) {
used_width = try_compute_width(min_width);
}