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/*
* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/Length.h>
#include <LibWeb/DOM/Node.h>
#include <LibWeb/Dump.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/InlineFormattingContext.h>
#include <LibWeb/Layout/InlineLevelIterator.h>
#include <LibWeb/Layout/LineBuilder.h>
#include <LibWeb/Layout/ReplacedBox.h>
namespace Web::Layout {
InlineFormattingContext::InlineFormattingContext(BlockContainer& containing_block, FormattingContext* parent)
: FormattingContext(Type::Inline, containing_block, parent)
{
}
InlineFormattingContext::~InlineFormattingContext()
{
}
InlineFormattingContext::AvailableSpaceForLineInfo InlineFormattingContext::available_space_for_line(float y) const
{
if (!parent()->is_block_formatting_context())
return { 0, context_box().width() };
AvailableSpaceForLineInfo info;
auto const& bfc = static_cast<BlockFormattingContext const&>(*parent());
for (ssize_t i = bfc.left_floating_boxes().size() - 1; i >= 0; --i) {
auto& floating_box = *bfc.left_floating_boxes().at(i);
auto rect = floating_box.margin_box_as_relative_rect();
if (rect.contains_vertically(y)) {
info.left = rect.right() + 1;
break;
}
}
info.right = containing_block().width();
for (ssize_t i = bfc.right_floating_boxes().size() - 1; i >= 0; --i) {
auto& floating_box = *bfc.right_floating_boxes().at(i);
auto rect = floating_box.margin_box_as_relative_rect();
if (rect.contains_vertically(y)) {
info.right = rect.left() - 1;
break;
}
}
return info;
}
void InlineFormattingContext::run(Box&, LayoutMode layout_mode)
{
VERIFY(containing_block().children_are_inline());
generate_line_boxes(layout_mode);
containing_block().for_each_child([&](auto& child) {
VERIFY(child.is_inline());
if (is<Box>(child) && child.is_absolutely_positioned()) {
layout_absolutely_positioned_element(verify_cast<Box>(child));
return;
}
});
float min_line_height = containing_block().line_height();
float max_line_width = 0;
float content_height = 0;
for (auto& line_box : containing_block().line_boxes()) {
float max_height = min_line_height;
for (auto& fragment : line_box.fragments()) {
max_height = max(max_height, fragment.height());
}
max_line_width = max(max_line_width, line_box.width());
content_height += max_height;
}
if (layout_mode != LayoutMode::Default) {
containing_block().set_width(max_line_width);
}
containing_block().set_height(content_height);
}
float InlineFormattingContext::available_width_at_line(size_t line_index) const
{
// TODO: Remove this function, along with the old-style splitting functions.
VERIFY_NOT_REACHED();
auto info = available_space_for_line(line_index);
return info.right - info.left;
}
void InlineFormattingContext::dimension_box_on_line(Box& box, LayoutMode layout_mode)
{
if (is<ReplacedBox>(box)) {
auto& replaced = verify_cast<ReplacedBox>(box);
replaced.set_width(compute_width_for_replaced_element(replaced));
replaced.set_height(compute_height_for_replaced_element(replaced));
return;
}
if (box.is_inline_block()) {
auto& inline_block = const_cast<BlockContainer&>(verify_cast<BlockContainer>(box));
if (inline_block.computed_values().width().is_length() && inline_block.computed_values().width().length().is_undefined_or_auto()) {
auto result = calculate_shrink_to_fit_widths(inline_block);
auto width_of_containing_block = CSS::Length::make_px(containing_block().width());
auto margin_left = inline_block.computed_values().margin().left.resolved(width_of_containing_block).resolved_or_zero(inline_block).to_px(inline_block);
auto border_left_width = inline_block.computed_values().border_left().width;
auto padding_left = inline_block.computed_values().padding().left.resolved(width_of_containing_block).resolved_or_zero(inline_block).to_px(inline_block);
auto margin_right = inline_block.computed_values().margin().right.resolved(width_of_containing_block).resolved_or_zero(inline_block).to_px(inline_block);
auto border_right_width = inline_block.computed_values().border_right().width;
auto padding_right = inline_block.computed_values().padding().right.resolved(width_of_containing_block).resolved_or_zero(inline_block).to_px(inline_block);
auto available_width = containing_block().width()
- margin_left
- border_left_width
- padding_left
- padding_right
- border_right_width
- margin_right;
auto width = min(max(result.preferred_minimum_width, available_width), result.preferred_width);
inline_block.set_width(width);
} else {
auto container_width = CSS::Length::make_px(containing_block().width());
inline_block.set_width(inline_block.computed_values().width().resolved(container_width).resolved_or_zero(inline_block).to_px(inline_block));
}
(void)layout_inside(inline_block, layout_mode);
if (inline_block.computed_values().height().is_length() && inline_block.computed_values().height().length().is_undefined_or_auto()) {
// FIXME: (10.6.6) If 'height' is 'auto', the height depends on the element's descendants per 10.6.7.
} else {
auto container_height = CSS::Length::make_px(containing_block().height());
inline_block.set_height(inline_block.computed_values().height().resolved(container_height).resolved_or_zero(inline_block).to_px(inline_block));
}
return;
}
// Non-replaced, non-inline-block, box on a line!?
// I don't think we should be here. Dump the box tree so we can take a look at it.
dbgln("FIXME: I've been asked to dimension a non-replaced, non-inline-block box on a line:");
dump_tree(box);
}
void InlineFormattingContext::generate_line_boxes(LayoutMode layout_mode)
{
containing_block().line_boxes().clear();
InlineLevelIterator iterator(containing_block(), layout_mode);
LineBuilder line_builder(*this);
for (;;) {
auto item_opt = iterator.next(line_builder.available_width_for_current_line());
if (!item_opt.has_value())
break;
auto& item = item_opt.value();
// Ignore collapsible whitespace chunks at the start of line, and if the last fragment already ends in whitespace.
if (item.is_collapsible_whitespace && containing_block().line_boxes().last().is_empty_or_ends_in_whitespace())
continue;
switch (item.type) {
case InlineLevelIterator::Item::Type::ForcedBreak:
line_builder.break_line();
break;
case InlineLevelIterator::Item::Type::Element: {
auto& box = verify_cast<Layout::Box>(*item.node);
dimension_box_on_line(box, layout_mode);
line_builder.break_if_needed(layout_mode, box.width(), item.should_force_break);
line_builder.append_box(box);
break;
}
case InlineLevelIterator::Item::Type::Text: {
auto& text_node = verify_cast<Layout::TextNode>(*item.node);
line_builder.break_if_needed(layout_mode, item.width, item.should_force_break);
line_builder.append_text_chunk(
text_node,
item.offset_in_node,
item.length_in_node,
item.width,
text_node.font().glyph_height());
break;
}
}
}
for (auto& line_box : containing_block().line_boxes()) {
line_box.trim_trailing_whitespace();
}
line_builder.remove_last_line_if_empty();
}
}
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