c9700e100e
This patch adds a map of Layout::Node to FormattingState::NodeState. Instead of updating layout nodes incrementally as layout progresses through the formatting contexts, all updates are now written to the corresponding NodeState instead. At the end of layout, FormattingState::commit() is called, which transfers all the values from the NodeState objects to the Node. This will soon allow us to perform completely non-destructive layouts which don't affect the tree. Note that there are many imperfections here, and still many places where we assign to the NodeState, but later read directly from the Node instead. I'm just committing at this stage to make subsequent diffs easier to understand.
77 lines
2.7 KiB
C++
77 lines
2.7 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 const& 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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// FIXME: Move this to FormattingContext!
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const_cast<Box&>(static_cast<Box const&>(layout_node)).set_containing_line_box_fragment(m_fragments.last());
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}
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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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