d3adc94ce8
We won't know if we need to break before the inline-block box until after we've dimensioned it.
135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/*
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* Copyright (c) 2022, 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 <LibWeb/Layout/BreakNode.h>
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#include <LibWeb/Layout/InlineLevelIterator.h>
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#include <LibWeb/Layout/InlineNode.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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namespace Web::Layout {
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// This is similar to Layout::Node::next_in_pre_order() but will not descend into inline-block nodes.
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static Layout::Node* next_inline_node_in_pre_order(Layout::Node& current, Layout::Node const* stay_within)
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{
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if (current.first_child() && current.first_child()->is_inline() && !current.is_inline_block())
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return current.first_child();
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Layout::Node* node = ¤t;
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Layout::Node* next = nullptr;
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while (!(next = node->next_sibling())) {
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node = node->parent();
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if (!node || node == stay_within)
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return nullptr;
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}
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return next;
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}
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void InlineLevelIterator::skip_to_next()
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{
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VERIFY(m_current_node);
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do {
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m_current_node = next_inline_node_in_pre_order(*m_current_node, &m_container);
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} while (m_current_node && !m_current_node->is_inline());
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}
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Optional<InlineLevelIterator::Item> InlineLevelIterator::next(float available_width)
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{
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if (!m_current_node)
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return {};
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if (is<Layout::TextNode>(*m_current_node)) {
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auto& text_node = static_cast<Layout::TextNode&>(*m_current_node);
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if (!m_text_node_context.has_value())
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enter_text_node(text_node);
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auto chunk_opt = m_text_node_context->chunk_iterator.next();
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if (!chunk_opt.has_value()) {
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m_text_node_context = {};
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skip_to_next();
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return next(available_width);
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}
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auto& chunk = chunk_opt.value();
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float chunk_width = text_node.font().width(chunk.view) + text_node.font().glyph_spacing();
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Item item {
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.type = Item::Type::Text,
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.node = &text_node,
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.offset_in_node = chunk.start,
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.length_in_node = chunk.length,
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.width = chunk_width,
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.should_force_break = m_text_node_context->do_respect_linebreaks && chunk.has_breaking_newline,
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};
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return item;
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}
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if (is<Layout::BreakNode>(*m_current_node)) {
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skip_to_next();
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return Item {
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.type = Item::Type::ForcedBreak,
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};
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}
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if (!is<Layout::Box>(*m_current_node)) {
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skip_to_next();
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return next(available_width);
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}
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if (is<Layout::ReplacedBox>(*m_current_node)) {
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auto& replaced_box = static_cast<Layout::ReplacedBox&>(*m_current_node);
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replaced_box.prepare_for_replaced_layout();
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}
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auto& box = verify_cast<Layout::Box>(*m_current_node);
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skip_to_next();
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return Item {
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.type = Item::Type::Element,
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.node = &box,
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.offset_in_node = 0,
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.length_in_node = 0,
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.width = box.width(),
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};
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}
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void InlineLevelIterator::enter_text_node(Layout::TextNode& text_node)
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{
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bool do_collapse = true;
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bool do_wrap_lines = true;
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bool do_respect_linebreaks = false;
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if (text_node.computed_values().white_space() == CSS::WhiteSpace::Nowrap) {
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do_collapse = true;
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do_wrap_lines = false;
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do_respect_linebreaks = false;
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} else if (text_node.computed_values().white_space() == CSS::WhiteSpace::Pre) {
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do_collapse = false;
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do_wrap_lines = false;
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do_respect_linebreaks = true;
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} else if (text_node.computed_values().white_space() == CSS::WhiteSpace::PreLine) {
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do_collapse = true;
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do_wrap_lines = true;
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do_respect_linebreaks = true;
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} else if (text_node.computed_values().white_space() == CSS::WhiteSpace::PreWrap) {
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do_collapse = false;
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do_wrap_lines = true;
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do_respect_linebreaks = true;
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}
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// FIXME: Pass the correct value for the last boolean!
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text_node.compute_text_for_rendering(do_collapse, true);
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m_text_node_context = TextNodeContext {
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.do_collapse = do_collapse,
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.do_wrap_lines = do_wrap_lines,
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.do_respect_linebreaks = do_respect_linebreaks,
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.chunk_iterator = TextNode::ChunkIterator { text_node.text_for_rendering(), m_layout_mode, do_wrap_lines, do_respect_linebreaks },
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};
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}
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}
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