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34954f49b6
I've seen a crash when trying to verify_cast some block-level box to a BlockContainer when it's actually something else. This patch adds a debug log message so we can learn more about it next time it happens somewhere.
1215 lines
62 KiB
C++
1215 lines
62 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/TemporaryChange.h>
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#include <LibWeb/CSS/Length.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/HTML/BrowsingContext.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Layout/BlockFormattingContext.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/LineBuilder.h>
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#include <LibWeb/Layout/ListItemBox.h>
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#include <LibWeb/Layout/ListItemMarkerBox.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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#include <LibWeb/Layout/SVGSVGBox.h>
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#include <LibWeb/Layout/TableWrapper.h>
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#include <LibWeb/Layout/Viewport.h>
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namespace Web::Layout {
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BlockFormattingContext::BlockFormattingContext(LayoutState& state, BlockContainer const& root, FormattingContext* parent)
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: FormattingContext(Type::Block, state, root, parent)
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{
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}
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BlockFormattingContext::~BlockFormattingContext()
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{
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if (!m_was_notified_after_parent_dimensioned_my_root_box) {
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// HACK: The parent formatting context never notified us after assigning dimensions to our root box.
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// Pretend that it did anyway, to make sure absolutely positioned children get laid out.
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// FIXME: Get rid of this hack once parent contexts behave properly.
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parent_context_did_dimension_child_root_box();
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}
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}
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CSSPixels BlockFormattingContext::automatic_content_width() const
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{
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if (root().children_are_inline())
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return m_state.get(root()).content_width();
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return greatest_child_width(root());
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}
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CSSPixels BlockFormattingContext::automatic_content_height() const
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{
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return compute_auto_height_for_block_formatting_context_root(root());
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}
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static bool margins_collapse_through(Box const& box, LayoutState& state)
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{
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// FIXME: A box's own margins collapse if the 'min-height' property is zero, and it has neither top or bottom borders
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// nor top or bottom padding, and it has a 'height' of either 0 or 'auto', and it does not contain a line box, and
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// all of its in-flow children's margins (if any) collapse.
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// https://www.w3.org/TR/CSS22/box.html#collapsing-margins
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// FIXME: For the purpose of margin collapsing (CSS 2 §8.3.1 Collapsing margins), if the block axis is the
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// ratio-dependent axis, it is not considered to have a computed block-size of auto.
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// https://www.w3.org/TR/css-sizing-4/#aspect-ratio-margin-collapse
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if (box.computed_values().clear() != CSS::Clear::None)
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return false;
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return state.get(box).border_box_height() == 0;
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}
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void BlockFormattingContext::run(Box const&, LayoutMode layout_mode, AvailableSpace const& available_space)
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{
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if (is<Viewport>(root())) {
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layout_viewport(layout_mode, available_space);
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return;
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}
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if (root().children_are_inline())
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layout_inline_children(root(), layout_mode, available_space);
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else
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layout_block_level_children(root(), layout_mode, available_space);
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// Assign collapsed margin left after children layout of formatting context to the last child box
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if (m_margin_state.current_collapsed_margin() != 0) {
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for (auto* child_box = root().last_child_of_type<Box>(); child_box; child_box = child_box->previous_sibling_of_type<Box>()) {
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if (child_box->is_absolutely_positioned() || child_box->is_floating())
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continue;
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if (margins_collapse_through(*child_box, m_state))
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continue;
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m_state.get_mutable(*child_box).margin_bottom = m_margin_state.current_collapsed_margin();
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break;
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}
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}
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}
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void BlockFormattingContext::parent_context_did_dimension_child_root_box()
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{
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m_was_notified_after_parent_dimensioned_my_root_box = true;
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// Left-side floats: offset_from_edge is from left edge (0) to left content edge of floating_box.
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for (auto& floating_box : m_left_floats.all_boxes) {
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auto& box_state = m_state.get_mutable(floating_box->box);
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box_state.set_content_x(floating_box->offset_from_edge);
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}
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// Right-side floats: offset_from_edge is from right edge (float_containing_block_width) to the left content edge of floating_box.
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for (auto& floating_box : m_right_floats.all_boxes) {
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auto float_containing_block_width = containing_block_width_for(floating_box->box);
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auto& box_state = m_state.get_mutable(floating_box->box);
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box_state.set_content_x(float_containing_block_width - floating_box->offset_from_edge);
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}
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// We can also layout absolutely positioned boxes within this BFC.
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for (auto& box : m_absolutely_positioned_boxes) {
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auto& cb_state = m_state.get(*box->containing_block());
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auto available_width = AvailableSize::make_definite(cb_state.content_width() + cb_state.padding_left + cb_state.padding_right);
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auto available_height = AvailableSize::make_definite(cb_state.content_height() + cb_state.padding_top + cb_state.padding_bottom);
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layout_absolutely_positioned_element(box, AvailableSpace(available_width, available_height));
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}
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}
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bool BlockFormattingContext::box_should_avoid_floats_because_it_establishes_fc(Box const& box)
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{
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if (auto formatting_context_type = formatting_context_type_created_by_box(box); formatting_context_type.has_value()) {
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if (formatting_context_type.value() == Type::Block)
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return true;
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if (formatting_context_type.value() == Type::Flex)
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return true;
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if (formatting_context_type.value() == Type::Grid)
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return true;
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}
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return false;
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}
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void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const& available_space, LayoutMode)
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{
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if (box.is_absolutely_positioned()) {
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compute_width_for_absolutely_positioned_element(box, available_space);
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return;
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}
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auto remaining_available_space = available_space;
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if (available_space.width.is_definite() && box_should_avoid_floats_because_it_establishes_fc(box)) {
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// NOTE: Although CSS 2.2 specification says that only block formatting contexts should avoid floats,
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// we also do this for flex and grid formatting contexts, because that how other engines behave.
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// 9.5 Floats
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// The border box of a table, a block-level replaced element, or an element in the normal flow that establishes a
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// new block formatting context (such as an element with 'overflow' other than 'visible') must not overlap the margin
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// box of any floats in the same block formatting context as the element itself. If necessary, implementations should
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// clear the said element by placing it below any preceding floats, but may place it adjacent to such floats if there is
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// sufficient space. They may even make the border box of said element narrower than defined by section 10.3.3.
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// CSS2 does not define when a UA may put said element next to the float or by how much said element may
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// become narrower.
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auto intrusion = intrusion_by_floats_into_box(box, 0);
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auto remaining_width = available_space.width.to_px_or_zero() - intrusion.left - intrusion.right;
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remaining_available_space.width = AvailableSize::make_definite(remaining_width);
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}
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if (box_is_sized_as_replaced_element(box)) {
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// FIXME: This should not be done *by* ReplacedBox
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if (is<ReplacedBox>(box)) {
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auto& replaced = verify_cast<ReplacedBox>(box);
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// FIXME: This const_cast is gross.
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const_cast<ReplacedBox&>(replaced).prepare_for_replaced_layout();
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}
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compute_width_for_block_level_replaced_element_in_normal_flow(box, remaining_available_space);
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if (box.is_floating()) {
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// 10.3.6 Floating, replaced elements:
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// https://www.w3.org/TR/CSS22/visudet.html#float-replaced-width
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return;
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}
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}
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if (box.is_floating()) {
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// 10.3.5 Floating, non-replaced elements:
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// https://www.w3.org/TR/CSS22/visudet.html#float-width
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compute_width_for_floating_box(box, available_space);
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return;
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}
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auto const& computed_values = box.computed_values();
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auto width_of_containing_block = remaining_available_space.width.to_px_or_zero();
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auto zero_value = CSS::Length::make_px(0);
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auto margin_left = CSS::Length::make_auto();
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auto margin_right = CSS::Length::make_auto();
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auto const padding_left = computed_values.padding().left().resolved(box, width_of_containing_block).to_px(box);
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auto const padding_right = computed_values.padding().right().resolved(box, width_of_containing_block).to_px(box);
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auto& box_state = m_state.get_mutable(box);
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box_state.border_left = computed_values.border_left().width;
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box_state.border_right = computed_values.border_right().width;
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box_state.padding_left = padding_left;
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box_state.padding_right = padding_right;
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// NOTE: If we are calculating the min-content or max-content width of this box,
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// and the width should be treated as auto, then we can simply return here,
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// as the preferred width and min/max constraints are irrelevant for intrinsic sizing.
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if (box_state.width_constraint != SizeConstraint::None)
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return;
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auto try_compute_width = [&](CSS::Length const& a_width) {
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CSS::Length width = a_width;
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margin_left = computed_values.margin().left().resolved(box, width_of_containing_block);
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margin_right = computed_values.margin().right().resolved(box, width_of_containing_block);
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CSSPixels total_px = computed_values.border_left().width + computed_values.border_right().width;
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for (auto& value : { margin_left, CSS::Length::make_px(padding_left), width, CSS::Length::make_px(padding_right), margin_right }) {
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total_px += value.to_px(box);
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}
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if (!box.is_inline()) {
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// 10.3.3 Block-level, non-replaced elements in normal flow
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// If 'width' is not 'auto' and 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' (plus any of 'margin-left' or 'margin-right' that are not 'auto') is larger than the width of the containing block, then any 'auto' values for 'margin-left' or 'margin-right' are, for the following rules, treated as zero.
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if (!width.is_auto() && total_px > width_of_containing_block) {
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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}
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// 10.3.3 cont'd.
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auto underflow_px = width_of_containing_block - total_px;
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if (available_space.width.is_intrinsic_sizing_constraint())
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underflow_px = 0;
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if (width.is_auto()) {
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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if (available_space.width.is_definite()) {
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if (underflow_px >= 0) {
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width = CSS::Length::make_px(underflow_px);
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} else {
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width = zero_value;
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margin_right = CSS::Length::make_px(margin_right.to_px(box) + underflow_px);
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}
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}
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} else {
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if (!margin_left.is_auto() && !margin_right.is_auto()) {
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margin_right = CSS::Length::make_px(margin_right.to_px(box) + underflow_px);
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} else if (!margin_left.is_auto() && margin_right.is_auto()) {
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margin_right = CSS::Length::make_px(underflow_px);
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} else if (margin_left.is_auto() && !margin_right.is_auto()) {
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margin_left = CSS::Length::make_px(underflow_px);
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} else { // margin_left.is_auto() && margin_right.is_auto()
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auto half_of_the_underflow = CSS::Length::make_px(underflow_px / 2);
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margin_left = half_of_the_underflow;
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margin_right = half_of_the_underflow;
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}
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}
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}
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return width;
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};
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auto input_width = [&] {
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if (box_is_sized_as_replaced_element(box)) {
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// NOTE: Replaced elements had their width calculated independently above.
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// We use that width as the input here to ensure that margins get resolved.
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return CSS::Length::make_px(box_state.content_width());
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}
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if (is<TableWrapper>(box))
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return CSS::Length::make_px(compute_table_box_width_inside_table_wrapper(box, remaining_available_space));
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if (should_treat_width_as_auto(box, remaining_available_space))
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return CSS::Length::make_auto();
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return CSS::Length::make_px(calculate_inner_width(box, remaining_available_space.width, computed_values.width()));
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}();
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto used_width = try_compute_width(input_width);
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// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
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// but this time using the computed value of 'max-width' as the computed value for 'width'.
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if (!should_treat_max_width_as_none(box, available_space.width)) {
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auto max_width = calculate_inner_width(box, remaining_available_space.width, computed_values.max_width());
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auto used_width_px = used_width.is_auto() ? CSSPixels { 0 } : used_width.to_px(box);
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if (used_width_px > max_width) {
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used_width = try_compute_width(CSS::Length::make_px(max_width));
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}
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}
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// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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// but this time using the value of 'min-width' as the computed value for 'width'.
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if (!computed_values.min_width().is_auto()) {
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auto min_width = calculate_inner_width(box, remaining_available_space.width, computed_values.min_width());
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auto used_width_px = used_width.is_auto() ? remaining_available_space.width : AvailableSize::make_definite(used_width.to_px(box));
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if (used_width_px < min_width) {
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used_width = try_compute_width(CSS::Length::make_px(min_width));
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}
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}
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if (!box_is_sized_as_replaced_element(box) && !used_width.is_auto())
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box_state.set_content_width(used_width.to_px(box));
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box_state.margin_left = margin_left.to_px(box);
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box_state.margin_right = margin_right.to_px(box);
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}
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void BlockFormattingContext::compute_width_for_floating_box(Box const& box, AvailableSpace const& available_space)
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{
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// 10.3.5 Floating, non-replaced elements
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auto& computed_values = box.computed_values();
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auto zero_value = CSS::Length::make_px(0);
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auto width_of_containing_block = available_space.width.to_px_or_zero();
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auto margin_left = computed_values.margin().left().resolved(box, width_of_containing_block);
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auto margin_right = computed_values.margin().right().resolved(box, width_of_containing_block);
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auto const padding_left = computed_values.padding().left().resolved(box, width_of_containing_block).to_px(box);
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auto const padding_right = computed_values.padding().right().resolved(box, width_of_containing_block).to_px(box);
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// If 'margin-left', or 'margin-right' are computed as 'auto', their used value is '0'.
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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auto compute_width = [&](auto width) {
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// If 'width' is computed as 'auto', the used value is the "shrink-to-fit" width.
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if (width.is_auto()) {
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auto result = calculate_shrink_to_fit_widths(box);
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if (available_space.width.is_definite()) {
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// Find the available width: in this case, this is the width of the containing
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// block minus the used values of 'margin-left', 'border-left-width', 'padding-left',
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// 'padding-right', 'border-right-width', 'margin-right', and the widths of any relevant scroll bars.
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auto available_width = available_space.width.to_px_or_zero()
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- margin_left.to_px(box) - computed_values.border_left().width - padding_left
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- padding_right - computed_values.border_right().width - margin_right.to_px(box);
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// Then the shrink-to-fit width is: min(max(preferred minimum width, available width), preferred width).
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width = CSS::Length::make_px(min(max(result.preferred_minimum_width, available_width), result.preferred_width));
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} else if (available_space.width.is_indefinite() || available_space.width.is_max_content()) {
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// Fold the formula for shrink-to-fit width for indefinite and max-content available width.
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width = CSS::Length::make_px(result.preferred_width);
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} else {
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// Fold the formula for shrink-to-fit width for min-content available width.
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width = CSS::Length::make_px(min(result.preferred_minimum_width, result.preferred_width));
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}
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}
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return width;
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};
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auto input_width = [&] {
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if (should_treat_width_as_auto(box, available_space))
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return CSS::Length::make_auto();
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return CSS::Length::make_px(calculate_inner_width(box, available_space.width, computed_values.width()));
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}();
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto width = compute_width(input_width);
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// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
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// but this time using the computed value of 'max-width' as the computed value for 'width'.
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if (!should_treat_max_width_as_none(box, available_space.width)) {
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auto max_width = calculate_inner_width(box, available_space.width, computed_values.max_width());
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if (width.to_px(box) > max_width)
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width = compute_width(CSS::Length::make_px(max_width));
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}
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// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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// but this time using the value of 'min-width' as the computed value for 'width'.
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if (!computed_values.min_width().is_auto()) {
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auto min_width = calculate_inner_width(box, available_space.width, computed_values.min_width());
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if (width.to_px(box) < min_width)
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width = compute_width(CSS::Length::make_px(min_width));
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}
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auto& box_state = m_state.get_mutable(box);
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box_state.set_content_width(width.to_px(box));
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box_state.margin_left = margin_left.to_px(box);
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box_state.margin_right = margin_right.to_px(box);
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box_state.border_left = computed_values.border_left().width;
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box_state.border_right = computed_values.border_right().width;
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box_state.padding_left = padding_left;
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box_state.padding_right = padding_right;
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}
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void BlockFormattingContext::compute_width_for_block_level_replaced_element_in_normal_flow(Box const& box, AvailableSpace const& available_space)
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{
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// 10.3.6 Floating, replaced elements
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auto& computed_values = box.computed_values();
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auto zero_value = CSS::Length::make_px(0);
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auto width_of_containing_block = available_space.width.to_px_or_zero();
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// 10.3.4 Block-level, replaced elements in normal flow
|
||
// The used value of 'width' is determined as for inline replaced elements. Then the rules for
|
||
// non-replaced block-level elements are applied to determine the margins.
|
||
auto margin_left = computed_values.margin().left().resolved(box, width_of_containing_block);
|
||
auto margin_right = computed_values.margin().right().resolved(box, width_of_containing_block);
|
||
auto const padding_left = computed_values.padding().left().resolved(box, width_of_containing_block).to_px(box);
|
||
auto const padding_right = computed_values.padding().right().resolved(box, width_of_containing_block).to_px(box);
|
||
|
||
// If 'margin-left', or 'margin-right' are computed as 'auto', their used value is '0'.
|
||
if (margin_left.is_auto())
|
||
margin_left = zero_value;
|
||
if (margin_right.is_auto())
|
||
margin_right = zero_value;
|
||
|
||
auto& box_state = m_state.get_mutable(box);
|
||
box_state.set_content_width(compute_width_for_replaced_element(box, available_space));
|
||
box_state.margin_left = margin_left.to_px(box);
|
||
box_state.margin_right = margin_right.to_px(box);
|
||
box_state.border_left = computed_values.border_left().width;
|
||
box_state.border_right = computed_values.border_right().width;
|
||
box_state.padding_left = padding_left;
|
||
box_state.padding_right = padding_right;
|
||
}
|
||
|
||
void BlockFormattingContext::compute_height(Box const& box, AvailableSpace const& available_space)
|
||
{
|
||
auto const& computed_values = box.computed_values();
|
||
auto& box_used_values = m_state.get_mutable(box);
|
||
|
||
// Then work out what the height is, based on box type and CSS properties.
|
||
CSSPixels height = 0;
|
||
if (box_is_sized_as_replaced_element(box)) {
|
||
height = compute_height_for_replaced_element(box, available_space);
|
||
} else {
|
||
if (should_treat_height_as_auto(box, available_space)) {
|
||
height = compute_auto_height_for_block_level_element(box, m_state.get(box).available_inner_space_or_constraints_from(available_space));
|
||
} else {
|
||
height = calculate_inner_height(box, available_space.height, computed_values.height());
|
||
}
|
||
}
|
||
|
||
if (!should_treat_max_height_as_none(box, available_space.height)) {
|
||
if (!computed_values.max_height().is_auto()) {
|
||
auto max_height = calculate_inner_height(box, available_space.height, computed_values.max_height());
|
||
height = min(height, max_height);
|
||
}
|
||
}
|
||
if (!computed_values.min_height().is_auto()) {
|
||
height = max(height, calculate_inner_height(box, available_space.height, computed_values.min_height()));
|
||
}
|
||
|
||
if (box.document().in_quirks_mode()
|
||
&& box.dom_node()
|
||
&& box.dom_node()->is_html_html_element()
|
||
&& box.computed_values().height().is_auto()) {
|
||
// 3.6. The html element fills the viewport quirk
|
||
// https://quirks.spec.whatwg.org/#the-html-element-fills-the-viewport-quirk
|
||
// FIXME: Handle vertical writing mode.
|
||
|
||
auto& box_state = m_state.get_mutable(box);
|
||
|
||
// 1. Let margins be sum of the used values of the margin-left and margin-right properties of element
|
||
// if element has a vertical writing mode, otherwise let margins be the sum of the used values of
|
||
// the margin-top and margin-bottom properties of element.
|
||
auto margins = box_state.margin_top + box_state.margin_bottom;
|
||
|
||
// 2. Let size be the size of the initial containing block in the block flow direction minus margins.
|
||
auto size = m_state.get(*box.containing_block()).content_height() - margins;
|
||
|
||
// 3. Return the bigger value of size and the normal border box size the element would have
|
||
// according to the CSS specification.
|
||
height = max(size, height);
|
||
|
||
// NOTE: The height of the root element when affected by this quirk is considered to be definite.
|
||
box_used_values.set_has_definite_height(true);
|
||
}
|
||
|
||
box_used_values.set_content_height(height);
|
||
}
|
||
|
||
void BlockFormattingContext::layout_inline_children(BlockContainer const& block_container, LayoutMode layout_mode, AvailableSpace const& available_space)
|
||
{
|
||
VERIFY(block_container.children_are_inline());
|
||
|
||
auto& block_container_state = m_state.get_mutable(block_container);
|
||
|
||
InlineFormattingContext context(m_state, block_container, block_container_state, *this);
|
||
context.run(
|
||
block_container,
|
||
layout_mode,
|
||
available_space);
|
||
|
||
if (!block_container_state.has_definite_width()) {
|
||
// NOTE: min-width or max-width for boxes with inline children can only be applied after inside layout
|
||
// is done and width of box content is known
|
||
auto used_width_px = context.automatic_content_width();
|
||
// https://www.w3.org/TR/css-sizing-3/#sizing-values
|
||
// Percentages are resolved against the width/height, as appropriate, of the box’s containing block.
|
||
auto containing_block_width = m_state.get(*block_container.containing_block()).content_width();
|
||
auto available_width = AvailableSize::make_definite(containing_block_width);
|
||
if (!should_treat_max_width_as_none(block_container, available_space.width)) {
|
||
auto max_width_px = calculate_inner_width(block_container, available_width, block_container.computed_values().max_width());
|
||
if (used_width_px > max_width_px)
|
||
used_width_px = max_width_px;
|
||
}
|
||
|
||
auto should_treat_min_width_as_auto = [&] {
|
||
auto const& available_width = available_space.width;
|
||
auto const& min_width = block_container.computed_values().min_width();
|
||
if (min_width.is_auto())
|
||
return true;
|
||
if (min_width.is_fit_content() && available_width.is_intrinsic_sizing_constraint())
|
||
return true;
|
||
if (min_width.is_max_content() && available_width.is_max_content())
|
||
return true;
|
||
if (min_width.is_min_content() && available_width.is_min_content())
|
||
return true;
|
||
return false;
|
||
}();
|
||
if (!should_treat_min_width_as_auto) {
|
||
auto min_width_px = calculate_inner_width(block_container, available_width, block_container.computed_values().min_width());
|
||
if (used_width_px < min_width_px)
|
||
used_width_px = min_width_px;
|
||
}
|
||
block_container_state.set_content_width(used_width_px);
|
||
block_container_state.set_content_height(context.automatic_content_height());
|
||
}
|
||
}
|
||
|
||
CSSPixels BlockFormattingContext::compute_auto_height_for_block_level_element(Box const& box, AvailableSpace const& available_space)
|
||
{
|
||
if (creates_block_formatting_context(box)) {
|
||
return compute_auto_height_for_block_formatting_context_root(box);
|
||
}
|
||
|
||
auto const& box_state = m_state.get(box);
|
||
|
||
auto display = box.display();
|
||
if (display.is_flex_inside()) {
|
||
// https://drafts.csswg.org/css-flexbox-1/#algo-main-container
|
||
// NOTE: The automatic block size of a block-level flex container is its max-content size.
|
||
return calculate_max_content_height(box, available_space.width.to_px_or_zero());
|
||
}
|
||
if (display.is_grid_inside()) {
|
||
// https://www.w3.org/TR/css-grid-2/#intrinsic-sizes
|
||
// In both inline and block formatting contexts, the grid container’s auto block size is its
|
||
// max-content size.
|
||
return calculate_max_content_height(box, available_space.width.to_px_or_zero());
|
||
}
|
||
if (display.is_table_inside()) {
|
||
return calculate_max_content_height(box, available_space.width.to_px_or_zero());
|
||
}
|
||
|
||
// https://www.w3.org/TR/CSS22/visudet.html#normal-block
|
||
// 10.6.3 Block-level non-replaced elements in normal flow when 'overflow' computes to 'visible'
|
||
|
||
// The element's height is the distance from its top content edge to the first applicable of the following:
|
||
|
||
// 1. the bottom edge of the last line box, if the box establishes a inline formatting context with one or more lines
|
||
if (box.children_are_inline() && !box_state.line_boxes.is_empty())
|
||
return box_state.line_boxes.last().bottom();
|
||
|
||
// 2. the bottom edge of the bottom (possibly collapsed) margin of its last in-flow child, if the child's bottom margin does not collapse with the element's bottom margin
|
||
// 3. the bottom border edge of the last in-flow child whose top margin doesn't collapse with the element's bottom margin
|
||
if (!box.children_are_inline()) {
|
||
for (auto* child_box = box.last_child_of_type<Box>(); child_box; child_box = child_box->previous_sibling_of_type<Box>()) {
|
||
if (child_box->is_absolutely_positioned() || child_box->is_floating())
|
||
continue;
|
||
|
||
// FIXME: This is hack. If the last child is a list-item marker box, we ignore it for purposes of height calculation.
|
||
// Perhaps markers should not be considered in-flow(?) Perhaps they should always be the first child of the list-item
|
||
// box instead of the last child.
|
||
if (child_box->is_list_item_marker_box())
|
||
continue;
|
||
|
||
auto const& child_box_state = m_state.get(*child_box);
|
||
|
||
if (margins_collapse_through(*child_box, m_state))
|
||
continue;
|
||
|
||
auto margin_bottom = m_margin_state.current_collapsed_margin();
|
||
if (box_state.padding_bottom == 0 && box_state.border_bottom == 0) {
|
||
m_margin_state.box_last_in_flow_child_margin_bottom_collapsed = true;
|
||
margin_bottom = 0;
|
||
}
|
||
|
||
return max(CSSPixels(0), child_box_state.offset.y() + child_box_state.content_height() + child_box_state.border_box_bottom() + margin_bottom);
|
||
}
|
||
}
|
||
|
||
// 4. zero, otherwise
|
||
return 0;
|
||
}
|
||
|
||
void BlockFormattingContext::layout_block_level_box(Box const& box, BlockContainer const& block_container, LayoutMode layout_mode, CSSPixels& bottom_of_lowest_margin_box, AvailableSpace const& available_space)
|
||
{
|
||
auto& box_state = m_state.get_mutable(box);
|
||
|
||
if (box.is_absolutely_positioned()) {
|
||
box_state.vertical_offset_of_parent_block_container = m_y_offset_of_current_block_container.value();
|
||
m_absolutely_positioned_boxes.append(box);
|
||
return;
|
||
}
|
||
|
||
// NOTE: ListItemMarkerBoxes are placed by their corresponding ListItemBox.
|
||
if (is<ListItemMarkerBox>(box))
|
||
return;
|
||
|
||
resolve_vertical_box_model_metrics(box);
|
||
|
||
if (box.is_floating()) {
|
||
auto const y = m_y_offset_of_current_block_container.value();
|
||
auto margin_top = !m_margin_state.has_block_container_waiting_for_final_y_position() ? m_margin_state.current_collapsed_margin() : 0;
|
||
layout_floating_box(box, block_container, layout_mode, available_space, margin_top + y);
|
||
bottom_of_lowest_margin_box = max(bottom_of_lowest_margin_box, box_state.offset.y() + box_state.content_height() + box_state.margin_box_bottom());
|
||
return;
|
||
}
|
||
|
||
m_margin_state.add_margin(box_state.margin_top);
|
||
auto introduce_clearance = clear_floating_boxes(box, {});
|
||
if (introduce_clearance == DidIntroduceClearance::Yes)
|
||
m_margin_state.reset();
|
||
|
||
auto const y = m_y_offset_of_current_block_container.value();
|
||
|
||
auto box_is_html_element_in_quirks_mode = box.document().in_quirks_mode()
|
||
&& box.dom_node()
|
||
&& box.dom_node()->is_html_html_element()
|
||
&& box.computed_values().height().is_auto();
|
||
|
||
// NOTE: In quirks mode, the html element's height matches the viewport so it can be treated as definite
|
||
if (box_state.has_definite_height() || box_is_html_element_in_quirks_mode) {
|
||
compute_height(box, available_space);
|
||
}
|
||
|
||
auto independent_formatting_context = create_independent_formatting_context_if_needed(m_state, box);
|
||
|
||
if (!independent_formatting_context && !is<BlockContainer>(box)) {
|
||
dbgln("FIXME: Block-level box is not BlockContainer but does not create formatting context: {}", box.debug_description());
|
||
return;
|
||
}
|
||
|
||
m_margin_state.update_block_waiting_for_final_y_position();
|
||
CSSPixels margin_top = m_margin_state.current_collapsed_margin();
|
||
|
||
if (m_margin_state.has_block_container_waiting_for_final_y_position()) {
|
||
// If first child margin top will collapse with margin-top of containing block then margin-top of child is 0
|
||
margin_top = 0;
|
||
}
|
||
|
||
if (independent_formatting_context) {
|
||
// Margins of elements that establish new formatting contexts do not collapse with their in-flow children
|
||
m_margin_state.reset();
|
||
}
|
||
|
||
place_block_level_element_in_normal_flow_vertically(box, y + margin_top);
|
||
|
||
compute_width(box, available_space, layout_mode);
|
||
|
||
place_block_level_element_in_normal_flow_horizontally(box, available_space);
|
||
|
||
// NOTE: Flex containers with `auto` height are treated as `max-content`, so we can compute their height early.
|
||
if (box.is_replaced_box() || box.display().is_flex_inside())
|
||
compute_height(box, available_space);
|
||
|
||
if (independent_formatting_context) {
|
||
// This box establishes a new formatting context. Pass control to it.
|
||
independent_formatting_context->run(box, layout_mode, box_state.available_inner_space_or_constraints_from(available_space));
|
||
} else {
|
||
// This box participates in the current block container's flow.
|
||
if (box.children_are_inline()) {
|
||
layout_inline_children(verify_cast<BlockContainer>(box), layout_mode, box_state.available_inner_space_or_constraints_from(available_space));
|
||
} else {
|
||
if (box_state.border_top > 0 || box_state.padding_top > 0) {
|
||
// margin-top of block container can't collapse with it's children if it has non zero border or padding
|
||
m_margin_state.reset();
|
||
} else if (!m_margin_state.has_block_container_waiting_for_final_y_position()) {
|
||
// margin-top of block container can be updated during children layout hence it's final y position yet to be determined
|
||
m_margin_state.register_block_container_y_position_update_callback([&](CSSPixels margin_top) {
|
||
if (introduce_clearance == DidIntroduceClearance::No) {
|
||
place_block_level_element_in_normal_flow_vertically(box, margin_top + y);
|
||
}
|
||
});
|
||
}
|
||
|
||
layout_block_level_children(verify_cast<BlockContainer>(box), layout_mode, box_state.available_inner_space_or_constraints_from(available_space));
|
||
}
|
||
}
|
||
|
||
// Tables already set their height during the independent formatting context run. When multi-line text cells are involved, using different
|
||
// available space here than during the independent formatting context run can result in different line breaks and thus a different height.
|
||
if (!box.display().is_table_inside()) {
|
||
compute_height(box, available_space);
|
||
}
|
||
|
||
if (independent_formatting_context || !margins_collapse_through(box, m_state)) {
|
||
if (!m_margin_state.box_last_in_flow_child_margin_bottom_collapsed) {
|
||
m_margin_state.reset();
|
||
}
|
||
m_y_offset_of_current_block_container = box_state.offset.y() + box_state.content_height() + box_state.border_box_bottom();
|
||
}
|
||
m_margin_state.box_last_in_flow_child_margin_bottom_collapsed = false;
|
||
|
||
m_margin_state.add_margin(box_state.margin_bottom);
|
||
m_margin_state.update_block_waiting_for_final_y_position();
|
||
|
||
compute_inset(box);
|
||
|
||
if (is<ListItemBox>(box)) {
|
||
layout_list_item_marker(static_cast<ListItemBox const&>(box));
|
||
}
|
||
|
||
bottom_of_lowest_margin_box = max(bottom_of_lowest_margin_box, box_state.offset.y() + box_state.content_height() + box_state.margin_box_bottom());
|
||
|
||
if (independent_formatting_context)
|
||
independent_formatting_context->parent_context_did_dimension_child_root_box();
|
||
}
|
||
|
||
void BlockFormattingContext::layout_block_level_children(BlockContainer const& block_container, LayoutMode layout_mode, AvailableSpace const& available_space)
|
||
{
|
||
VERIFY(!block_container.children_are_inline());
|
||
|
||
CSSPixels bottom_of_lowest_margin_box = 0;
|
||
|
||
TemporaryChange<Optional<CSSPixels>> change { m_y_offset_of_current_block_container, CSSPixels(0) };
|
||
block_container.for_each_child_of_type<Box>([&](Box& box) {
|
||
layout_block_level_box(box, block_container, layout_mode, bottom_of_lowest_margin_box, available_space);
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
m_margin_state.block_container_y_position_update_callback = {};
|
||
|
||
if (layout_mode == LayoutMode::IntrinsicSizing) {
|
||
auto& block_container_state = m_state.get_mutable(block_container);
|
||
if (!block_container_state.has_definite_width()) {
|
||
auto width = greatest_child_width(block_container);
|
||
auto const& computed_values = block_container.computed_values();
|
||
// NOTE: Min and max constraints are not applied to a box that is being sized as intrinsic because
|
||
// according to css-sizing-3 spec:
|
||
// The min-content size of a box in each axis is the size it would have if it was a float given an
|
||
// auto size in that axis (and no minimum or maximum size in that axis) and if its containing block
|
||
// was zero-sized in that axis.
|
||
if (block_container_state.width_constraint == SizeConstraint::None) {
|
||
if (!should_treat_max_width_as_none(block_container, available_space.width)) {
|
||
auto max_width = calculate_inner_width(block_container, available_space.width,
|
||
computed_values.max_width());
|
||
width = min(width, max_width);
|
||
}
|
||
if (!computed_values.min_width().is_auto()) {
|
||
auto min_width = calculate_inner_width(block_container, available_space.width,
|
||
computed_values.min_width());
|
||
width = max(width, min_width);
|
||
}
|
||
}
|
||
block_container_state.set_content_width(width);
|
||
block_container_state.set_content_height(bottom_of_lowest_margin_box);
|
||
}
|
||
}
|
||
}
|
||
|
||
void BlockFormattingContext::resolve_vertical_box_model_metrics(Box const& box)
|
||
{
|
||
auto& box_state = m_state.get_mutable(box);
|
||
auto const& computed_values = box.computed_values();
|
||
auto width_of_containing_block = containing_block_width_for(box);
|
||
|
||
box_state.margin_top = computed_values.margin().top().to_px(box, width_of_containing_block);
|
||
box_state.margin_bottom = computed_values.margin().bottom().to_px(box, width_of_containing_block);
|
||
box_state.border_top = computed_values.border_top().width;
|
||
box_state.border_bottom = computed_values.border_bottom().width;
|
||
box_state.padding_top = computed_values.padding().top().to_px(box, width_of_containing_block);
|
||
box_state.padding_bottom = computed_values.padding().bottom().to_px(box, width_of_containing_block);
|
||
}
|
||
|
||
CSSPixels BlockFormattingContext::BlockMarginState::current_collapsed_margin() const
|
||
{
|
||
CSSPixels smallest_margin = 0;
|
||
CSSPixels largest_margin = 0;
|
||
size_t negative_margin_count = 0;
|
||
for (auto margin : current_collapsible_margins) {
|
||
if (margin < 0)
|
||
++negative_margin_count;
|
||
largest_margin = max(largest_margin, margin);
|
||
smallest_margin = min(smallest_margin, margin);
|
||
}
|
||
|
||
CSSPixels collapsed_margin = 0;
|
||
if (negative_margin_count == current_collapsible_margins.size()) {
|
||
// When all margins are negative, the size of the collapsed margin is the smallest (most negative) margin.
|
||
collapsed_margin = smallest_margin;
|
||
} else if (negative_margin_count > 0) {
|
||
// When negative margins are involved, the size of the collapsed margin is the sum of the largest positive margin and the smallest (most negative) negative margin.
|
||
collapsed_margin = largest_margin + smallest_margin;
|
||
} else {
|
||
// Otherwise, collapse all the adjacent margins by using only the largest one.
|
||
collapsed_margin = largest_margin;
|
||
}
|
||
|
||
return collapsed_margin;
|
||
}
|
||
|
||
BlockFormattingContext::DidIntroduceClearance BlockFormattingContext::clear_floating_boxes(Node const& child_box, Optional<InlineFormattingContext&> inline_formatting_context)
|
||
{
|
||
auto const& computed_values = child_box.computed_values();
|
||
auto result = DidIntroduceClearance::No;
|
||
|
||
auto clear_floating_boxes = [&](FloatSideData& float_side) {
|
||
if (!float_side.current_boxes.is_empty()) {
|
||
// NOTE: Floating boxes are globally relevant within this BFC, *but* their offset coordinates
|
||
// are relative to their containing block.
|
||
// This means that we have to first convert to a root-space Y coordinate before clearing,
|
||
// and then convert back to a local Y coordinate when assigning the cleared offset to
|
||
// the `child_box` layout state.
|
||
|
||
// First, find the lowest margin box edge on this float side and calculate the Y offset just below it.
|
||
CSSPixels clearance_y_in_root = 0;
|
||
for (auto const& floating_box : float_side.current_boxes) {
|
||
auto floating_box_rect_in_root = margin_box_rect_in_ancestor_coordinate_space(floating_box.used_values, root());
|
||
clearance_y_in_root = max(clearance_y_in_root, floating_box_rect_in_root.bottom());
|
||
}
|
||
|
||
// Then, convert the clearance Y to a coordinate relative to the containing block of `child_box`.
|
||
CSSPixels clearance_y_in_containing_block = clearance_y_in_root;
|
||
for (auto* containing_block = child_box.containing_block(); containing_block && containing_block != &root(); containing_block = containing_block->containing_block())
|
||
clearance_y_in_containing_block -= m_state.get(*containing_block).offset.y();
|
||
|
||
if (inline_formatting_context.has_value()) {
|
||
if (clearance_y_in_containing_block > inline_formatting_context->vertical_float_clearance()) {
|
||
result = DidIntroduceClearance::Yes;
|
||
inline_formatting_context->set_vertical_float_clearance(clearance_y_in_containing_block);
|
||
}
|
||
} else if (clearance_y_in_containing_block > m_y_offset_of_current_block_container.value()) {
|
||
result = DidIntroduceClearance::Yes;
|
||
m_y_offset_of_current_block_container = clearance_y_in_containing_block;
|
||
}
|
||
|
||
float_side.clear();
|
||
}
|
||
};
|
||
|
||
// Flex-items don't float and also don't clear.
|
||
if ((computed_values.clear() == CSS::Clear::Left || computed_values.clear() == CSS::Clear::Both) && !child_box.is_flex_item())
|
||
clear_floating_boxes(m_left_floats);
|
||
if ((computed_values.clear() == CSS::Clear::Right || computed_values.clear() == CSS::Clear::Both) && !child_box.is_flex_item())
|
||
clear_floating_boxes(m_right_floats);
|
||
|
||
return result;
|
||
}
|
||
|
||
void BlockFormattingContext::place_block_level_element_in_normal_flow_vertically(Box const& child_box, CSSPixels y)
|
||
{
|
||
auto& box_state = m_state.get_mutable(child_box);
|
||
y += box_state.border_box_top();
|
||
box_state.set_content_offset(CSSPixelPoint { box_state.offset.x(), y });
|
||
}
|
||
|
||
// Returns whether the given box has the given ancestor on the path to root, ignoring the anonymous blocks.
|
||
static bool box_has_ancestor_in_non_anonymous_containing_block_chain(Box const* box, Box const& ancestor, Box const& root)
|
||
{
|
||
Box const* current_ancestor = box ? box->non_anonymous_containing_block() : &root;
|
||
while (current_ancestor != &root) {
|
||
if (current_ancestor == &ancestor)
|
||
return true;
|
||
current_ancestor = current_ancestor->non_anonymous_containing_block();
|
||
}
|
||
return false;
|
||
}
|
||
|
||
void BlockFormattingContext::place_block_level_element_in_normal_flow_horizontally(Box const& child_box, AvailableSpace const& available_space)
|
||
{
|
||
auto& box_state = m_state.get_mutable(child_box);
|
||
|
||
CSSPixels x = 0;
|
||
CSSPixels available_width_within_containing_block = available_space.width.to_px_or_zero();
|
||
|
||
if ((!m_left_floats.current_boxes.is_empty() || !m_right_floats.current_boxes.is_empty())
|
||
&& creates_block_formatting_context(child_box)) {
|
||
auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(box_state, root());
|
||
auto space_and_containing_margin = space_used_and_containing_margin_for_floats(box_in_root_rect.y());
|
||
available_width_within_containing_block -= space_and_containing_margin.left_used_space + space_and_containing_margin.right_used_space;
|
||
auto const& containing_box_state = m_state.get(*child_box.containing_block());
|
||
if (box_has_ancestor_in_non_anonymous_containing_block_chain(space_and_containing_margin.matching_left_float_box, *child_box.non_anonymous_containing_block(), root()))
|
||
x = space_and_containing_margin.left_used_space;
|
||
else
|
||
// If the floating box doesn't share a containing block with the child box, the child box margin should overlap with the width of the floating box.
|
||
x = max(space_and_containing_margin.left_used_space - containing_box_state.margin_left, 0);
|
||
}
|
||
|
||
if (child_box.containing_block()->computed_values().text_align() == CSS::TextAlign::LibwebCenter) {
|
||
x += (available_width_within_containing_block / 2) - box_state.content_width() / 2;
|
||
} else if (child_box.containing_block()->computed_values().text_align() == CSS::TextAlign::LibwebRight) {
|
||
// Subtracting the left margin here because left and right margins need to be swapped when aligning to the right
|
||
x += available_width_within_containing_block - box_state.content_width() - box_state.margin_box_left();
|
||
} else {
|
||
x += box_state.margin_box_left();
|
||
}
|
||
|
||
box_state.set_content_offset({ x, box_state.offset.y() });
|
||
}
|
||
|
||
void BlockFormattingContext::layout_viewport(LayoutMode layout_mode, AvailableSpace const& available_space)
|
||
{
|
||
// NOTE: If we are laying out a standalone SVG document, we give it some special treatment:
|
||
// The root <svg> container gets the same size as the viewport,
|
||
// and we call directly into the SVG layout code from here.
|
||
if (root().first_child() && root().first_child()->is_svg_svg_box()) {
|
||
auto const& svg_root = verify_cast<SVGSVGBox>(*root().first_child());
|
||
auto content_height = m_state.get(*svg_root.containing_block()).content_height();
|
||
m_state.get_mutable(svg_root).set_content_height(content_height);
|
||
auto svg_formatting_context = create_independent_formatting_context_if_needed(m_state, svg_root);
|
||
svg_formatting_context->run(svg_root, layout_mode, available_space);
|
||
} else {
|
||
if (root().children_are_inline())
|
||
layout_inline_children(root(), layout_mode, available_space);
|
||
else
|
||
layout_block_level_children(root(), layout_mode, available_space);
|
||
}
|
||
}
|
||
|
||
void BlockFormattingContext::layout_floating_box(Box const& box, BlockContainer const&, LayoutMode layout_mode, AvailableSpace const& available_space, CSSPixels y, LineBuilder* line_builder)
|
||
{
|
||
VERIFY(box.is_floating());
|
||
|
||
auto& box_state = m_state.get_mutable(box);
|
||
auto const& computed_values = box.computed_values();
|
||
|
||
resolve_vertical_box_model_metrics(box);
|
||
|
||
compute_width(box, available_space, layout_mode);
|
||
auto independent_formatting_context = layout_inside(box, layout_mode, box_state.available_inner_space_or_constraints_from(available_space));
|
||
compute_height(box, available_space);
|
||
|
||
// First we place the box normally (to get the right y coordinate.)
|
||
// If we have a LineBuilder, we're in the middle of inline layout, otherwise this is block layout.
|
||
if (line_builder) {
|
||
auto y = max(line_builder->y_for_float_to_be_inserted_here(box), line_builder->inline_formatting_context().vertical_float_clearance());
|
||
box_state.set_content_y(y + box_state.margin_box_top());
|
||
} else {
|
||
place_block_level_element_in_normal_flow_vertically(box, y + box_state.margin_top);
|
||
place_block_level_element_in_normal_flow_horizontally(box, available_space);
|
||
}
|
||
|
||
// Then we float it to the left or right.
|
||
auto float_box = [&](FloatSide side, FloatSideData& side_data, FloatSideData& other_side_data) {
|
||
CSSPixels offset_from_edge = 0;
|
||
auto float_to_edge = [&] {
|
||
if (side == FloatSide::Left)
|
||
offset_from_edge = box_state.margin_box_left();
|
||
else
|
||
offset_from_edge = box_state.content_width() + box_state.margin_box_right();
|
||
};
|
||
|
||
auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(box_state, root());
|
||
CSSPixels y_in_root = box_in_root_rect.y();
|
||
CSSPixels y = box_state.offset.y();
|
||
|
||
if (side_data.current_boxes.is_empty()) {
|
||
// This is the first floating box on this side. Go all the way to the edge.
|
||
float_to_edge();
|
||
side_data.y_offset = 0;
|
||
} else {
|
||
|
||
// NOTE: If we're in inline layout, the LineBuilder has already provided the right Y offset.
|
||
// In block layout, we adjust by the side's current Y offset here.
|
||
if (!line_builder)
|
||
y_in_root += side_data.y_offset;
|
||
|
||
bool did_touch_preceding_float = false;
|
||
bool did_place_next_to_preceding_float = false;
|
||
|
||
// Walk all currently tracked floats on the side we're floating towards.
|
||
// We're looking for the innermost preceding float that intersects vertically with `box`.
|
||
for (auto& preceding_float : side_data.current_boxes.in_reverse()) {
|
||
auto const preceding_float_rect = margin_box_rect_in_ancestor_coordinate_space(preceding_float.used_values, root());
|
||
if (!preceding_float_rect.contains_vertically(y_in_root))
|
||
continue;
|
||
// We found a preceding float that intersects vertically with the current float.
|
||
// Now we need to find out if there's enough inline-axis space to stack them next to each other.
|
||
CSSPixels tentative_offset_from_edge = 0;
|
||
bool fits_next_to_preceding_float = false;
|
||
if (side == FloatSide::Left) {
|
||
tentative_offset_from_edge = max(preceding_float.offset_from_edge + preceding_float.used_values.content_width() + preceding_float.used_values.margin_box_right(), 0) + box_state.margin_box_left();
|
||
if (available_space.width.is_definite()) {
|
||
fits_next_to_preceding_float = (tentative_offset_from_edge + box_state.content_width() + box_state.margin_box_right()) <= available_space.width.to_px_or_zero();
|
||
} else if (available_space.width.is_max_content() || available_space.width.is_indefinite()) {
|
||
fits_next_to_preceding_float = true;
|
||
}
|
||
} else {
|
||
tentative_offset_from_edge = preceding_float.offset_from_edge + preceding_float.used_values.margin_box_left() + box_state.margin_box_right() + box_state.content_width();
|
||
fits_next_to_preceding_float = tentative_offset_from_edge >= 0;
|
||
}
|
||
did_touch_preceding_float = true;
|
||
if (!fits_next_to_preceding_float)
|
||
break;
|
||
offset_from_edge = tentative_offset_from_edge;
|
||
did_place_next_to_preceding_float = true;
|
||
break;
|
||
}
|
||
|
||
auto has_clearance = false;
|
||
if (side == FloatSide::Left) {
|
||
has_clearance = computed_values.clear() == CSS::Clear::Left || computed_values.clear() == CSS::Clear::Both;
|
||
} else if (side == FloatSide::Right) {
|
||
has_clearance = computed_values.clear() == CSS::Clear::Right || computed_values.clear() == CSS::Clear::Both;
|
||
}
|
||
|
||
if (!did_touch_preceding_float || !did_place_next_to_preceding_float || has_clearance) {
|
||
// One of three things happened:
|
||
// - This box does not touch another floating box.
|
||
// - We ran out of horizontal space on this "float line", and need to break.
|
||
// - This box has clearance.
|
||
// Either way, we float this box all the way to the edge.
|
||
float_to_edge();
|
||
CSSPixels lowest_margin_edge = 0;
|
||
for (auto const& current : side_data.current_boxes) {
|
||
lowest_margin_edge = max(lowest_margin_edge, current.used_values.margin_box_height());
|
||
}
|
||
|
||
side_data.y_offset += lowest_margin_edge;
|
||
|
||
// Also, forget all previous boxes floated to this side while since they're no longer relevant.
|
||
side_data.clear();
|
||
}
|
||
}
|
||
|
||
// NOTE: If we're in inline layout, the LineBuilder has already provided the right Y offset.
|
||
// In block layout, we adjust by the side's current Y offset here.
|
||
// FIXME: It's annoying that we have different behavior for inline vs block here.
|
||
// Find a way to unify the behavior so we don't need to branch here.
|
||
|
||
if (!line_builder)
|
||
y += side_data.y_offset;
|
||
|
||
auto top_margin_edge = y - box_state.margin_box_top();
|
||
side_data.all_boxes.append(adopt_own(*new FloatingBox {
|
||
.box = box,
|
||
.used_values = box_state,
|
||
.offset_from_edge = offset_from_edge,
|
||
.top_margin_edge = top_margin_edge,
|
||
.bottom_margin_edge = y + box_state.content_height() + box_state.margin_box_bottom(),
|
||
}));
|
||
side_data.current_boxes.append(*side_data.all_boxes.last());
|
||
|
||
if (side == FloatSide::Left) {
|
||
side_data.current_width = offset_from_edge + box_state.content_width() + box_state.margin_box_right();
|
||
} else {
|
||
side_data.current_width = offset_from_edge + box_state.margin_box_left();
|
||
}
|
||
side_data.max_width = max(side_data.current_width, side_data.max_width);
|
||
|
||
// NOTE: We don't set the X position here, that happens later, once we know the root block width.
|
||
// See parent_context_did_dimension_child_root_box() for that logic.
|
||
box_state.set_content_y(y);
|
||
|
||
// If the new box was inserted below the bottom of the opposite side,
|
||
// we reset the other side back to its edge.
|
||
if (top_margin_edge > other_side_data.y_offset)
|
||
other_side_data.clear();
|
||
};
|
||
|
||
// Next, float to the left and/or right
|
||
if (box.computed_values().float_() == CSS::Float::Left) {
|
||
float_box(FloatSide::Left, m_left_floats, m_right_floats);
|
||
} else if (box.computed_values().float_() == CSS::Float::Right) {
|
||
float_box(FloatSide::Right, m_right_floats, m_left_floats);
|
||
}
|
||
|
||
m_state.get_mutable(root()).add_floating_descendant(box);
|
||
|
||
if (line_builder)
|
||
line_builder->recalculate_available_space();
|
||
|
||
compute_inset(box);
|
||
|
||
if (independent_formatting_context)
|
||
independent_formatting_context->parent_context_did_dimension_child_root_box();
|
||
}
|
||
|
||
void BlockFormattingContext::layout_list_item_marker(ListItemBox const& list_item_box)
|
||
{
|
||
if (!list_item_box.marker())
|
||
return;
|
||
|
||
auto& marker = *list_item_box.marker();
|
||
auto& marker_state = m_state.get_mutable(marker);
|
||
auto& list_item_state = m_state.get_mutable(list_item_box);
|
||
|
||
CSSPixels image_width = 0;
|
||
CSSPixels image_height = 0;
|
||
if (auto const* list_style_image = marker.list_style_image()) {
|
||
image_width = list_style_image->natural_width().value_or(0);
|
||
image_height = list_style_image->natural_height().value_or(0);
|
||
}
|
||
|
||
CSSPixels default_marker_width = max(4, marker.first_available_font().pixel_size_rounded_up() - 4);
|
||
|
||
auto marker_text = marker.text().value_or("");
|
||
if (marker_text.is_empty()) {
|
||
marker_state.set_content_width(image_width + default_marker_width);
|
||
} else {
|
||
auto text_width = marker.first_available_font().width(marker_text);
|
||
marker_state.set_content_width(image_width + CSSPixels::nearest_value_for(text_width));
|
||
}
|
||
|
||
marker_state.set_content_height(max(image_height, marker.first_available_font().pixel_size_rounded_up() + 1));
|
||
|
||
auto final_marker_width = marker_state.content_width() + default_marker_width;
|
||
|
||
if (marker.list_style_position() == CSS::ListStylePosition::Inside) {
|
||
list_item_state.set_content_offset({ final_marker_width, list_item_state.offset.y() });
|
||
list_item_state.set_content_width(list_item_state.content_width() - final_marker_width);
|
||
}
|
||
|
||
auto offset_y = max(CSSPixels(0), (marker.computed_values().line_height() - marker_state.content_height()) / 2);
|
||
auto space_and_containing_margin = intrusion_by_floats_into_box(list_item_state, offset_y);
|
||
marker_state.set_content_offset({ space_and_containing_margin.left - final_marker_width, offset_y });
|
||
|
||
if (marker_state.content_height() > list_item_state.content_height())
|
||
list_item_state.set_content_height(marker_state.content_height());
|
||
}
|
||
|
||
BlockFormattingContext::SpaceUsedAndContainingMarginForFloats BlockFormattingContext::space_used_and_containing_margin_for_floats(CSSPixels y) const
|
||
{
|
||
SpaceUsedAndContainingMarginForFloats space_and_containing_margin;
|
||
|
||
for (auto const& floating_box_ptr : m_left_floats.all_boxes.in_reverse()) {
|
||
auto const& floating_box = *floating_box_ptr;
|
||
// NOTE: The floating box is *not* in the final horizontal position yet, but the size and vertical position is valid.
|
||
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box.used_values, root());
|
||
if (rect.contains_vertically(y)) {
|
||
CSSPixels offset_from_containing_block_chain_margins_between_here_and_root = 0;
|
||
for (auto const* containing_block = floating_box.used_values.containing_block_used_values(); containing_block && &containing_block->node() != &root(); containing_block = containing_block->containing_block_used_values()) {
|
||
offset_from_containing_block_chain_margins_between_here_and_root += containing_block->margin_box_left();
|
||
}
|
||
space_and_containing_margin.left_used_space = floating_box.offset_from_edge
|
||
+ floating_box.used_values.content_width()
|
||
+ floating_box.used_values.margin_box_right();
|
||
space_and_containing_margin.left_total_containing_margin = offset_from_containing_block_chain_margins_between_here_and_root;
|
||
space_and_containing_margin.matching_left_float_box = floating_box.box.ptr();
|
||
break;
|
||
}
|
||
}
|
||
|
||
for (auto const& floating_box_ptr : m_right_floats.all_boxes.in_reverse()) {
|
||
auto const& floating_box = *floating_box_ptr;
|
||
// NOTE: The floating box is *not* in the final horizontal position yet, but the size and vertical position is valid.
|
||
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box.used_values, root());
|
||
if (rect.contains_vertically(y)) {
|
||
CSSPixels offset_from_containing_block_chain_margins_between_here_and_root = 0;
|
||
for (auto const* containing_block = floating_box.used_values.containing_block_used_values(); containing_block && &containing_block->node() != &root(); containing_block = containing_block->containing_block_used_values()) {
|
||
offset_from_containing_block_chain_margins_between_here_and_root += containing_block->margin_box_right();
|
||
}
|
||
space_and_containing_margin.right_used_space = floating_box.offset_from_edge
|
||
+ floating_box.used_values.margin_box_left();
|
||
space_and_containing_margin.right_total_containing_margin = offset_from_containing_block_chain_margins_between_here_and_root;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return space_and_containing_margin;
|
||
}
|
||
|
||
FormattingContext::SpaceUsedByFloats BlockFormattingContext::intrusion_by_floats_into_box(Box const& box, CSSPixels y_in_box) const
|
||
{
|
||
return intrusion_by_floats_into_box(m_state.get(box), y_in_box);
|
||
}
|
||
|
||
FormattingContext::SpaceUsedByFloats BlockFormattingContext::intrusion_by_floats_into_box(LayoutState::UsedValues const& box_used_values, CSSPixels y_in_box) const
|
||
{
|
||
// NOTE: Floats are relative to the BFC root box, not necessarily the containing block of this IFC.
|
||
auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(box_used_values, root());
|
||
CSSPixels y_in_root = box_in_root_rect.y() + y_in_box;
|
||
auto space_and_containing_margin = space_used_and_containing_margin_for_floats(y_in_root);
|
||
auto left_side_floats_limit_to_right = space_and_containing_margin.left_total_containing_margin + space_and_containing_margin.left_used_space;
|
||
auto right_side_floats_limit_to_right = space_and_containing_margin.right_used_space + space_and_containing_margin.right_total_containing_margin;
|
||
|
||
auto left_intrusion = max(CSSPixels(0), left_side_floats_limit_to_right - max(CSSPixels(0), box_in_root_rect.x()));
|
||
|
||
CSSPixels offset_from_containing_block_chain_margins_between_here_and_root = 0;
|
||
for (auto const* containing_block = &box_used_values; containing_block && &containing_block->node() != &root(); containing_block = containing_block->containing_block_used_values()) {
|
||
offset_from_containing_block_chain_margins_between_here_and_root = max(offset_from_containing_block_chain_margins_between_here_and_root, containing_block->margin_box_right());
|
||
}
|
||
auto right_intrusion = max(CSSPixels(0), right_side_floats_limit_to_right - offset_from_containing_block_chain_margins_between_here_and_root);
|
||
|
||
return { left_intrusion, right_intrusion };
|
||
}
|
||
|
||
CSSPixels BlockFormattingContext::greatest_child_width(Box const& box) const
|
||
{
|
||
// Similar to FormattingContext::greatest_child_width()
|
||
// but this one takes floats into account!
|
||
CSSPixels max_width = m_left_floats.max_width + m_right_floats.max_width;
|
||
if (box.children_are_inline()) {
|
||
for (auto const& line_box : m_state.get(verify_cast<BlockContainer>(box)).line_boxes) {
|
||
CSSPixels width_here = line_box.width();
|
||
CSSPixels extra_width_from_left_floats = 0;
|
||
for (auto& left_float : m_left_floats.all_boxes) {
|
||
// NOTE: Floats directly affect the automatic size of their containing block, but only indirectly anything above in the tree.
|
||
if (left_float->box->containing_block() != &box)
|
||
continue;
|
||
if (line_box.baseline() >= left_float->top_margin_edge || line_box.baseline() <= left_float->bottom_margin_edge) {
|
||
extra_width_from_left_floats = max(extra_width_from_left_floats, left_float->offset_from_edge + left_float->used_values.content_width() + left_float->used_values.margin_box_right());
|
||
}
|
||
}
|
||
CSSPixels extra_width_from_right_floats = 0;
|
||
for (auto& right_float : m_right_floats.all_boxes) {
|
||
// NOTE: Floats directly affect the automatic size of their containing block, but only indirectly anything above in the tree.
|
||
if (right_float->box->containing_block() != &box)
|
||
continue;
|
||
if (line_box.baseline() >= right_float->top_margin_edge || line_box.baseline() <= right_float->bottom_margin_edge) {
|
||
extra_width_from_right_floats = max(extra_width_from_right_floats, right_float->offset_from_edge + right_float->used_values.margin_box_left());
|
||
}
|
||
}
|
||
width_here += extra_width_from_left_floats + extra_width_from_right_floats;
|
||
max_width = max(max_width, width_here);
|
||
}
|
||
} else {
|
||
box.for_each_child_of_type<Box>([&](Box const& child) {
|
||
if (!child.is_absolutely_positioned())
|
||
max_width = max(max_width, m_state.get(child).margin_box_width());
|
||
});
|
||
}
|
||
return max_width;
|
||
}
|
||
|
||
}
|