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serenity/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
Andreas Kling 968ad0f8d1 LibWeb: Some improvements to CSS height:auto computation for blocks 
Auto block heights are now computed according to something that kinda
resembles the specification.

Blocks with inline children and height:auto have their height computed
based on the top of the first line box and the bottom of the last line
box. Very straightforward.

Blocks with block children and height:auto have their height computed
based on the top of the first in-flow block child's margin box, and the
bottom of the last in-flow block child's margin box.
2021-03-08 22:53:28 +01:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibWeb/CSS/Length.h>
#include <LibWeb/DOM/Node.h>
#include <LibWeb/Layout/BlockBox.h>
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/InitialContainingBlockBox.h>
#include <LibWeb/Layout/InlineFormattingContext.h>
#include <LibWeb/Layout/ListItemBox.h>
#include <LibWeb/Layout/ReplacedBox.h>
#include <LibWeb/Page/Frame.h>
namespace Web::Layout {
BlockFormattingContext::BlockFormattingContext(Box& context_box, FormattingContext* parent)
: FormattingContext(context_box, parent)
{
}
BlockFormattingContext::~BlockFormattingContext()
{
}
bool BlockFormattingContext::is_initial() const
{
return is<InitialContainingBlockBox>(context_box());
}
void BlockFormattingContext::run(Box& box, LayoutMode layout_mode)
{
if (is_initial()) {
layout_initial_containing_block(layout_mode);
return;
}
// FIXME: BFC currently computes the width+height of the target box.
// This is necessary to be able to place absolutely positioned descendants.
// The same work is also done by the parent BFC for each of its blocks..
if (layout_mode == LayoutMode::Default)
compute_width(box);
if (box.children_are_inline()) {
layout_inline_children(box, layout_mode);
} else {
layout_block_level_children(box, layout_mode);
}
if (layout_mode == LayoutMode::Default) {
compute_height(box);
box.for_each_child_of_type<Box>([&](auto& child_box) {
if (child_box.is_absolutely_positioned()) {
layout_absolutely_positioned_element(child_box);
}
return IterationDecision::Continue;
});
}
}
void BlockFormattingContext::compute_width(Box& box)
{
if (box.is_absolutely_positioned()) {
compute_width_for_absolutely_positioned_element(box);
return;
}
if (is<ReplacedBox>(box)) {
// FIXME: This should not be done *by* ReplacedBox
auto& replaced = downcast<ReplacedBox>(box);
replaced.prepare_for_replaced_layout();
compute_width_for_block_level_replaced_element_in_normal_flow(replaced);
return;
}
if (box.is_floating()) {
compute_width_for_floating_box(box);
return;
}
auto& computed_values = box.computed_values();
float width_of_containing_block = box.width_of_logical_containing_block();
auto zero_value = CSS::Length::make_px(0);
auto margin_left = CSS::Length::make_auto();
auto margin_right = CSS::Length::make_auto();
const auto padding_left = computed_values.padding().left.resolved_or_zero(box, width_of_containing_block);
const auto padding_right = computed_values.padding().right.resolved_or_zero(box, width_of_containing_block);
auto try_compute_width = [&](const auto& a_width) {
CSS::Length width = a_width;
margin_left = computed_values.margin().left.resolved_or_zero(box, width_of_containing_block);
margin_right = computed_values.margin().right.resolved_or_zero(box, width_of_containing_block);
float total_px = computed_values.border_left().width + computed_values.border_right().width;
for (auto& value : { margin_left, padding_left, width, padding_right, margin_right }) {
total_px += value.to_px(box);
}
if (!box.is_inline()) {
// 10.3.3 Block-level, non-replaced elements in normal flow
// 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.
if (width.is_auto() && total_px > width_of_containing_block) {
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
}
// 10.3.3 cont'd.
auto underflow_px = width_of_containing_block - total_px;
if (width.is_auto()) {
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
if (underflow_px >= 0) {
width = CSS::Length(underflow_px, CSS::Length::Type::Px);
} else {
width = zero_value;
margin_right = CSS::Length(margin_right.to_px(box) + underflow_px, CSS::Length::Type::Px);
}
} else {
if (!margin_left.is_auto() && !margin_right.is_auto()) {
margin_right = CSS::Length(margin_right.to_px(box) + underflow_px, CSS::Length::Type::Px);
} else if (!margin_left.is_auto() && margin_right.is_auto()) {
margin_right = CSS::Length(underflow_px, CSS::Length::Type::Px);
} else if (margin_left.is_auto() && !margin_right.is_auto()) {
margin_left = CSS::Length(underflow_px, CSS::Length::Type::Px);
} else { // margin_left.is_auto() && margin_right.is_auto()
auto half_of_the_underflow = CSS::Length(underflow_px / 2, CSS::Length::Type::Px);
margin_left = half_of_the_underflow;
margin_right = half_of_the_underflow;
}
}
} else if (box.is_inline_block()) {
// 10.3.9 'Inline-block', non-replaced elements in normal flow
// A computed value of 'auto' for 'margin-left' or 'margin-right' becomes a used value of '0'.
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
// If 'width' is 'auto', the used value is the shrink-to-fit width as for floating elements.
if (width.is_auto()) {
// Find the available width: in this case, this is the width of the containing
// block minus the used values of 'margin-left', 'border-left-width', 'padding-left',
// 'padding-right', 'border-right-width', 'margin-right', and the widths of any relevant scroll bars.
float available_width = width_of_containing_block
- margin_left.to_px(box) - computed_values.border_left().width - padding_left.to_px(box)
- padding_right.to_px(box) - computed_values.border_right().width - margin_right.to_px(box);
auto result = calculate_shrink_to_fit_widths(box);
// Then the shrink-to-fit width is: min(max(preferred minimum width, available width), preferred width).
width = CSS::Length(min(max(result.preferred_minimum_width, available_width), result.preferred_width), CSS::Length::Type::Px);
}
}
return width;
};
auto specified_width = computed_values.width().resolved_or_auto(box, width_of_containing_block);
// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
auto used_width = try_compute_width(specified_width);
// 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'.
auto specified_max_width = computed_values.max_width().resolved_or_auto(box, width_of_containing_block);
if (!specified_max_width.is_auto()) {
if (used_width.to_px(box) > specified_max_width.to_px(box)) {
used_width = try_compute_width(specified_max_width);
}
}
// 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'.
auto specified_min_width = computed_values.min_width().resolved_or_auto(box, width_of_containing_block);
if (!specified_min_width.is_auto()) {
if (used_width.to_px(box) < specified_min_width.to_px(box)) {
used_width = try_compute_width(specified_min_width);
}
}
box.set_width(used_width.to_px(box));
box.box_model().margin.left = margin_left.to_px(box);
box.box_model().margin.right = margin_right.to_px(box);
box.box_model().border.left = computed_values.border_left().width;
box.box_model().border.right = computed_values.border_right().width;
box.box_model().padding.left = padding_left.to_px(box);
box.box_model().padding.right = padding_right.to_px(box);
}
void BlockFormattingContext::compute_width_for_floating_box(Box& box)
{
// 10.3.5 Floating, non-replaced elements
auto& computed_values = box.computed_values();
float width_of_containing_block = box.width_of_logical_containing_block();
auto zero_value = CSS::Length::make_px(0);
auto margin_left = CSS::Length::make_auto();
auto margin_right = CSS::Length::make_auto();
const auto padding_left = computed_values.padding().left.resolved_or_zero(box, width_of_containing_block);
const auto padding_right = computed_values.padding().right.resolved_or_zero(box, width_of_containing_block);
// 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 width = computed_values.width().resolved_or_auto(box, width_of_containing_block);
// If 'width' is computed as 'auto', the used value is the "shrink-to-fit" width.
if (width.is_auto()) {
// Find the available width: in this case, this is the width of the containing
// block minus the used values of 'margin-left', 'border-left-width', 'padding-left',
// 'padding-right', 'border-right-width', 'margin-right', and the widths of any relevant scroll bars.
float available_width = width_of_containing_block
- margin_left.to_px(box) - computed_values.border_left().width - padding_left.to_px(box)
- padding_right.to_px(box) - computed_values.border_right().width - margin_right.to_px(box);
auto result = calculate_shrink_to_fit_widths(box);
// Then the shrink-to-fit width is: min(max(preferred minimum width, available width), preferred width).
width = CSS::Length(min(max(result.preferred_minimum_width, available_width), result.preferred_width), CSS::Length::Type::Px);
}
float final_width = width.resolved_or_zero(box, width_of_containing_block).to_px(box);
box.set_width(final_width);
}
void BlockFormattingContext::compute_width_for_block_level_replaced_element_in_normal_flow(ReplacedBox& box)
{
box.set_width(compute_width_for_replaced_element(box));
}
float BlockFormattingContext::compute_auto_height_for_block_level_element(const Box& box)
{
Optional<float> top;
Optional<float> bottom;
if (box.children_are_inline()) {
// If it only has inline-level children, the height is the distance between
// the top of the topmost line box and the bottom of the bottommost line box.
if (!box.line_boxes().is_empty()) {
for (auto& fragment : box.line_boxes().first().fragments()) {
if (!top.has_value() || fragment.offset().y() < top.value())
top = fragment.offset().y();
}
for (auto& fragment : box.line_boxes().last().fragments()) {
if (!bottom.has_value() || (fragment.offset().y() + fragment.height()) > bottom.value())
bottom = fragment.offset().y() + fragment.height();
}
}
} else {
// If it has block-level children, the height is the distance between
// the top margin-edge of the topmost block-level child box
// and the bottom margin-edge of the bottommost block-level child box.
box.for_each_child_of_type<Box>([&](Layout::Box& child_box) {
if (box.is_absolutely_positioned() || box.is_floating())
return IterationDecision::Continue;
float child_box_top = child_box.effective_offset().y() - child_box.box_model().margin_box().top;
float child_box_bottom = child_box.effective_offset().y() + child_box.height() + child_box.box_model().margin_box().bottom;
if (!top.has_value() || child_box_top < top.value())
top = child_box_top;
if (!bottom.has_value() || child_box_bottom > bottom.value())
bottom = child_box_bottom;
return IterationDecision::Continue;
});
}
return bottom.value_or(0) - top.value_or(0);
}
void BlockFormattingContext::compute_height(Box& box)
{
auto& computed_values = box.computed_values();
auto& containing_block = *box.containing_block();
// First, resolve the top/bottom parts of the surrounding box model.
box.box_model().margin.top = computed_values.margin().top.resolved_or_zero(box, containing_block.width()).to_px(box);
box.box_model().margin.bottom = computed_values.margin().bottom.resolved_or_zero(box, containing_block.width()).to_px(box);
box.box_model().border.top = computed_values.border_top().width;
box.box_model().border.bottom = computed_values.border_bottom().width;
box.box_model().padding.top = computed_values.padding().top.resolved_or_zero(box, containing_block.width()).to_px(box);
box.box_model().padding.bottom = computed_values.padding().bottom.resolved_or_zero(box, containing_block.width()).to_px(box);
// Then work out what the height is, based on box type and CSS properties.
float height = 0;
if (is<ReplacedBox>(box)) {
height = compute_height_for_replaced_element(downcast<ReplacedBox>(box));
} else {
if (box.computed_values().height().is_undefined_or_auto()) {
height = compute_auto_height_for_block_level_element(box);
} else {
CSS::Length specified_height;
if (computed_values.height().is_percentage() && !containing_block.computed_values().height().is_absolute()) {
specified_height = CSS::Length::make_auto();
} else {
specified_height = computed_values.height().resolved_or_auto(box, containing_block.height());
}
auto specified_max_height = computed_values.max_height().resolved_or_auto(box, containing_block.height());
if (!specified_height.is_auto()) {
float used_height = specified_height.to_px(box);
if (!specified_max_height.is_auto())
used_height = min(used_height, specified_max_height.to_px(box));
height = used_height;
}
}
}
box.set_height(height);
}
void BlockFormattingContext::layout_inline_children(Box& box, LayoutMode layout_mode)
{
InlineFormattingContext context(box, this);
context.run(box, layout_mode);
}
void BlockFormattingContext::layout_block_level_children(Box& box, LayoutMode layout_mode)
{
float content_height = 0;
float content_width = 0;
box.for_each_child_of_type<Box>([&](auto& child_box) {
if (child_box.is_absolutely_positioned())
return IterationDecision::Continue;
if (child_box.is_floating()) {
layout_floating_child(child_box, box);
return IterationDecision::Continue;
}
compute_width(child_box);
layout_inside(child_box, layout_mode);
compute_height(child_box);
if (is<ReplacedBox>(child_box))
place_block_level_replaced_element_in_normal_flow(child_box, box);
else if (is<BlockBox>(child_box))
place_block_level_non_replaced_element_in_normal_flow(child_box, box);
// FIXME: This should be factored differently. It's uncool that we mutate the tree *during* layout!
// Instead, we should generate the marker box during the tree build.
if (is<ListItemBox>(child_box))
downcast<ListItemBox>(child_box).layout_marker();
content_height = max(content_height, child_box.effective_offset().y() + child_box.height() + child_box.box_model().margin_box().bottom);
content_width = max(content_width, downcast<Box>(child_box).width());
return IterationDecision::Continue;
});
if (layout_mode != LayoutMode::Default) {
if (box.computed_values().width().is_undefined() || box.computed_values().width().is_auto())
box.set_width(content_width);
}
}
void BlockFormattingContext::place_block_level_replaced_element_in_normal_flow(Box& child_box, Box& containing_block)
{
VERIFY(!containing_block.is_absolutely_positioned());
auto& replaced_element_box_model = child_box.box_model();
replaced_element_box_model.margin.top = child_box.computed_values().margin().top.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
replaced_element_box_model.margin.bottom = child_box.computed_values().margin().bottom.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
replaced_element_box_model.border.top = child_box.computed_values().border_top().width;
replaced_element_box_model.border.bottom = child_box.computed_values().border_bottom().width;
replaced_element_box_model.padding.top = child_box.computed_values().padding().top.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
replaced_element_box_model.padding.bottom = child_box.computed_values().padding().bottom.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
float x = replaced_element_box_model.margin.left
+ replaced_element_box_model.border.left
+ replaced_element_box_model.padding.left
+ replaced_element_box_model.offset.left;
float y = replaced_element_box_model.margin_box().top + containing_block.box_model().offset.top;
child_box.set_offset(x, y);
}
void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_flow(Box& child_box, Box& containing_block)
{
auto& box_model = child_box.box_model();
auto& computed_values = child_box.computed_values();
box_model.margin.top = computed_values.margin().top.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
box_model.margin.bottom = computed_values.margin().bottom.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
box_model.border.top = computed_values.border_top().width;
box_model.border.bottom = computed_values.border_bottom().width;
box_model.padding.top = computed_values.padding().top.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
box_model.padding.bottom = computed_values.padding().bottom.resolved_or_zero(containing_block, containing_block.width()).to_px(child_box);
float x = box_model.margin.left
+ box_model.border.left
+ box_model.padding.left
+ box_model.offset.left;
if (containing_block.computed_values().text_align() == CSS::TextAlign::LibwebCenter) {
x = (containing_block.width() / 2) - child_box.width() / 2;
}
float y = box_model.margin_box().top
+ box_model.offset.top;
// NOTE: Empty (0-height) preceding siblings have their margins collapsed with *their* preceding sibling, etc.
float collapsed_bottom_margin_of_preceding_siblings = 0;
auto* relevant_sibling = child_box.previous_sibling_of_type<Layout::BlockBox>();
while (relevant_sibling != nullptr) {
if (!relevant_sibling->is_absolutely_positioned() && !relevant_sibling->is_floating()) {
collapsed_bottom_margin_of_preceding_siblings = max(collapsed_bottom_margin_of_preceding_siblings, relevant_sibling->box_model().margin.bottom);
if (relevant_sibling->border_box_height() > 0)
break;
}
relevant_sibling = relevant_sibling->previous_sibling();
}
if (relevant_sibling) {
y += relevant_sibling->effective_offset().y()
+ relevant_sibling->height()
+ relevant_sibling->box_model().border_box().bottom;
// Collapse top margin with bottom margin of preceding siblings if needed
float my_margin_top = box_model.margin.top;
if (my_margin_top < 0 || collapsed_bottom_margin_of_preceding_siblings < 0) {
// Negative margins present.
float largest_negative_margin = -min(my_margin_top, collapsed_bottom_margin_of_preceding_siblings);
float largest_positive_margin = (my_margin_top < 0 && collapsed_bottom_margin_of_preceding_siblings < 0) ? 0 : max(my_margin_top, collapsed_bottom_margin_of_preceding_siblings);
float final_margin = largest_positive_margin - largest_negative_margin;
y += final_margin - my_margin_top;
} else if (collapsed_bottom_margin_of_preceding_siblings > my_margin_top) {
// Sibling's margin is larger than mine, adjust so we use sibling's.
y += collapsed_bottom_margin_of_preceding_siblings - my_margin_top;
}
}
if (child_box.computed_values().clear() == CSS::Clear::Left || child_box.computed_values().clear() == CSS::Clear::Both) {
if (!m_left_floating_boxes.is_empty()) {
float clearance_y = 0;
for (auto* floating_box : m_left_floating_boxes) {
clearance_y = max(clearance_y, floating_box->effective_offset().y() + floating_box->box_model().margin_box().bottom);
}
y = max(y, clearance_y);
m_left_floating_boxes.clear();
}
}
if (child_box.computed_values().clear() == CSS::Clear::Right || child_box.computed_values().clear() == CSS::Clear::Both) {
if (!m_right_floating_boxes.is_empty()) {
float clearance_y = 0;
for (auto* floating_box : m_right_floating_boxes) {
clearance_y = max(clearance_y, floating_box->effective_offset().y() + floating_box->box_model().margin_box().bottom);
}
y = max(y, clearance_y);
m_right_floating_boxes.clear();
}
}
child_box.set_offset(x, y);
}
void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_mode)
{
auto viewport_rect = context_box().frame().viewport_rect();
auto& icb = downcast<Layout::InitialContainingBlockBox>(context_box());
icb.build_stacking_context_tree();
icb.set_width(viewport_rect.width());
layout_block_level_children(context_box(), layout_mode);
VERIFY(!icb.children_are_inline());
// FIXME: The ICB should have the height of the viewport.
// Instead of auto-sizing the ICB, we should spill into overflow.
float lowest_bottom = 0;
icb.for_each_child_of_type<Box>([&](auto& child) {
lowest_bottom = max(lowest_bottom, child.absolute_rect().bottom());
});
// FIXME: This is a hack and should be managed by an overflow mechanism.
icb.set_height(max(static_cast<float>(viewport_rect.height()), lowest_bottom));
}
static Gfx::FloatRect rect_in_coordinate_space(const Box& box, const Box& context_box)
{
Gfx::FloatRect rect { box.effective_offset(), box.size() };
for (auto* ancestor = box.parent(); ancestor; ancestor = ancestor->parent()) {
if (is<Box>(*ancestor)) {
auto offset = downcast<Box>(*ancestor).effective_offset();
rect.move_by(offset);
}
if (ancestor == &context_box)
break;
}
return rect;
}
void BlockFormattingContext::layout_floating_child(Box& box, Box& containing_block)
{
VERIFY(box.is_floating());
compute_width(box);
layout_inside(box, LayoutMode::Default);
compute_height(box);
// First we place the box normally (to get the right y coordinate.)
place_block_level_non_replaced_element_in_normal_flow(box, containing_block);
// Then we float it to the left or right.
float x = box.effective_offset().x();
auto box_in_context_rect = rect_in_coordinate_space(box, context_box());
float y_in_context_box = box_in_context_rect.y();
// Next, float to the left and/or right
if (box.computed_values().float_() == CSS::Float::Left) {
if (!m_left_floating_boxes.is_empty()) {
auto& previous_floating_box = *m_left_floating_boxes.last();
auto previous_rect = rect_in_coordinate_space(previous_floating_box, context_box());
if (previous_rect.contains_vertically(y_in_context_box)) {
// This box touches another already floating box. Stack to the right.
x = previous_floating_box.effective_offset().x() + previous_floating_box.width();
} else {
// This box does not touch another floating box, go all the way to the left.
x = 0;
// Also, forget all previous left-floating boxes while we're here since they're no longer relevant.
m_left_floating_boxes.clear();
}
} else {
// This is the first left-floating box. Go all the way to the left.
x = 0;
}
m_left_floating_boxes.append(&box);
} else if (box.computed_values().float_() == CSS::Float::Right) {
if (!m_right_floating_boxes.is_empty()) {
auto& previous_floating_box = *m_right_floating_boxes.last();
auto previous_rect = rect_in_coordinate_space(previous_floating_box, context_box());
if (previous_rect.contains_vertically(y_in_context_box)) {
// This box touches another already floating box. Stack to the left.
x = previous_floating_box.effective_offset().x() - box.width();
} else {
// This box does not touch another floating box, go all the way to the right.
x = containing_block.width() - box.width();
// Also, forget all previous right-floating boxes while we're here since they're no longer relevant.
m_right_floating_boxes.clear();
}
} else {
// This is the first right-floating box. Go all the way to the right.
x = containing_block.width() - box.width();
}
m_right_floating_boxes.append(&box);
}
box.set_offset(x, box.effective_offset().y());
}
}
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