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LibWeb: Rework the layout engine to use relative offsets

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The box tree and line boxes now all store a relative offset from their
containing block, instead of an absolute (document-relative) position.

This removes a huge pain point from the layout system which was having
to adjust offsets recursively when something moved. It also makes some
layout logic significantly simpler.

Every box can still find its absolute position by walking its chain
of containing blocks and accumulating the translation from the root.
This is currently what we do both for rendering and hit testing.
This commit is contained in:
Andreas Kling 2020-06-10 10:42:29 +02:00
commit 656b01eb0f
Notes: sideshowbarker 2024-07-19 05:43:53 +09:00
21 changed files with 183 additions and 119 deletions
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12
Libraries/LibWeb/Layout/LineBox.cpp
View file

@ -27,6 +27,7 @@
#include <AK/Utf8View.h>
#include <LibWeb/Layout/LayoutNode.h>
#include <LibWeb/Layout/LayoutText.h>
#include <LibWeb/Layout/LayoutBox.h>
#include <LibWeb/Layout/LineBox.h>
#include <ctype.h>
@ -39,18 +40,21 @@ void LineBox::add_fragment(const LayoutNode& layout_node, int start, int length,
// The fragment we're adding is from the last LayoutNode on the line.
// Expand the last fragment instead of adding a new one with the same LayoutNode.
m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
m_fragments.last().m_rect.set_width(m_fragments.last().m_rect.width() + width);
m_fragments.last().set_width(m_fragments.last().width() + width);
} else {
m_fragments.empend(layout_node, start, length, Gfx::FloatRect(m_width, 0, width, height));
m_fragments.append(make<LineBoxFragment>(layout_node, start, length, Gfx::FloatPoint(m_width, 0), Gfx::FloatSize(width, height)));
}
m_width += width;
if (is<LayoutBox>(layout_node))
const_cast<LayoutBox&>(to<LayoutBox>(layout_node)).set_containing_line_box_fragment(m_fragments.last());
}
void LineBox::trim_trailing_whitespace()
{
while (!m_fragments.is_empty() && m_fragments.last().is_justifiable_whitespace()) {
auto fragment = m_fragments.take_last();
m_width -= fragment.width();
m_width -= fragment->width();
}
if (m_fragments.is_empty())
@ -64,7 +68,7 @@ void LineBox::trim_trailing_whitespace()
int space_width = last_fragment.layout_node().style().font().glyph_width(' ');
while (last_fragment.length() && isspace(last_text[last_fragment.length() - 1])) {
last_fragment.m_length -= 1;
last_fragment.m_rect.set_width(last_fragment.m_rect.width() - space_width);
last_fragment.set_width(last_fragment.width() - space_width);
m_width -= space_width;
}
}