jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/CharacterTypes.h>
8#include <AK/TypeCasts.h>
9#include <AK/Utf8View.h>
10#include <LibWeb/Layout/Box.h>
11#include <LibWeb/Layout/BreakNode.h>
12#include <LibWeb/Layout/LineBox.h>
13#include <LibWeb/Layout/Node.h>
14#include <LibWeb/Layout/TextNode.h>
15
16namespace Web::Layout {
17
18void LineBox::add_fragment(Node const& layout_node, int start, int length, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin, CSSPixels content_width, CSSPixels content_height, CSSPixels border_box_top, CSSPixels border_box_bottom, LineBoxFragment::Type fragment_type)
19{
20 bool text_align_is_justify = layout_node.computed_values().text_align() == CSS::TextAlign::Justify;
21 if (!text_align_is_justify && !m_fragments.is_empty() && &m_fragments.last().layout_node() == &layout_node) {
22 // The fragment we're adding is from the last Layout::Node on the line.
23 // Expand the last fragment instead of adding a new one with the same Layout::Node.
24 m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
25 m_fragments.last().set_width(m_fragments.last().width() + content_width);
26 } else {
27 CSSPixels x_offset = leading_margin + leading_size + m_width;
28 CSSPixels y_offset = 0.0f;
29 m_fragments.append(LineBoxFragment { layout_node, start, length, CSSPixelPoint(x_offset, y_offset), CSSPixelSize(content_width, content_height), border_box_top, border_box_bottom, fragment_type });
30 }
31 m_width += leading_margin + leading_size + content_width + trailing_size + trailing_margin;
32}
33
34void LineBox::trim_trailing_whitespace()
35{
36 while (!m_fragments.is_empty() && m_fragments.last().is_justifiable_whitespace()) {
37 auto fragment = m_fragments.take_last();
38 m_width -= fragment.width().value();
39 }
40
41 if (m_fragments.is_empty())
42 return;
43
44 auto& last_fragment = m_fragments.last();
45 auto last_text = last_fragment.text();
46 if (last_text.is_null())
47 return;
48
49 while (last_fragment.length()) {
50 auto last_character = last_text[last_fragment.length() - 1];
51 if (!is_ascii_space(last_character))
52 break;
53
54 int last_character_width = last_fragment.layout_node().font().glyph_width(last_character);
55 last_fragment.m_length -= 1;
56 last_fragment.set_width(last_fragment.width() - last_character_width);
57 m_width -= last_character_width;
58 }
59}
60
61bool LineBox::is_empty_or_ends_in_whitespace() const
62{
63 if (m_fragments.is_empty())
64 return true;
65
66 return m_fragments.last().ends_in_whitespace();
67}
68
69}