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f2a917229a
Here's roughly how this works: - InlineLevelIterator keeps a nesting stack of inline-level nodes with box model metrics. - When entering a node with box model metrics, we add them to the current "leading metrics". - When exiting a node with box model metrics, we add them to the current "trailing metrics". - Pending leading metrics are consumed by the first fragment added to the line. - Pending trailing metrics are consumed by the last fragment added to the line. Like before, the position of a line box fragment is the top left of its content box. However, fragments are placed horizontally along the line with space inserted for padding and border. InlineNode::paint() now expands the content rect as appropriate when painting background and borders. Note that margins and margin collapsing is not yet implemented. This makes the eyes on ACID2 horizontally centered. :^)
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/CharacterTypes.h>
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#include <AK/TypeCasts.h>
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#include <AK/Utf8View.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/BreakNode.h>
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#include <LibWeb/Layout/LineBox.h>
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#include <LibWeb/Layout/Node.h>
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#include <LibWeb/Layout/TextNode.h>
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namespace Web::Layout {
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void LineBox::add_fragment(Node& layout_node, int start, int length, float leading_size, float trailing_size, float content_width, float content_height, LineBoxFragment::Type fragment_type)
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{
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bool text_align_is_justify = layout_node.computed_values().text_align() == CSS::TextAlign::Justify;
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if (!text_align_is_justify && !m_fragments.is_empty() && &m_fragments.last().layout_node() == &layout_node) {
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// The fragment we're adding is from the last Layout::Node on the line.
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// Expand the last fragment instead of adding a new one with the same Layout::Node.
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m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
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m_fragments.last().set_width(m_fragments.last().width() + content_width);
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} else {
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m_fragments.append(make<LineBoxFragment>(layout_node, start, length, Gfx::FloatPoint(m_width + leading_size, 0.0f), Gfx::FloatSize(content_width, content_height), fragment_type));
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}
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m_width += content_width + leading_size + trailing_size;
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if (is<Box>(layout_node))
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verify_cast<Box>(layout_node).set_containing_line_box_fragment(m_fragments.last());
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}
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void LineBox::trim_trailing_whitespace()
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{
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while (!m_fragments.is_empty() && m_fragments.last().is_justifiable_whitespace()) {
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auto fragment = m_fragments.take_last();
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m_width -= fragment->width();
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}
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if (m_fragments.is_empty())
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return;
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auto& last_fragment = m_fragments.last();
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auto last_text = last_fragment.text();
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if (last_text.is_null())
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return;
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while (last_fragment.length()) {
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auto last_character = last_text[last_fragment.length() - 1];
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if (!is_ascii_space(last_character))
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break;
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int last_character_width = last_fragment.layout_node().font().glyph_width(last_character);
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last_fragment.m_length -= 1;
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last_fragment.set_width(last_fragment.width() - last_character_width);
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m_width -= last_character_width;
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}
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}
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bool LineBox::is_empty_or_ends_in_whitespace() const
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{
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if (m_fragments.is_empty())
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return true;
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return m_fragments.last().ends_in_whitespace();
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}
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bool LineBox::ends_with_forced_line_break() const
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{
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return is<BreakNode>(m_fragments.last().layout_node());
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}
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}
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