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64959a8504
Previously, we had three layout modes:
- Normal:
- Everything uses the computed values from CSS.
- MinContent:
- Containing blocks act as if they have 0 width.
- All line breaking opportunities are taken.
- MaxContent:
- Containing blocks act as if they have infinite width.
- Only forced line breaks are accepted.
The above was based on a set of misunderstandings of CSS sizing.
A major problem with the above was that *all* containing blocks
behaved differently during intrinsic size layout, not just the
relevant one.
With this patch there are only two layout modes:
- Normal:
- Everything uses the computed values from CSS.
- IntrinsicSizeDetermination:
- One or more boxes have size constraints applied.
There are two size constraints per layout box, set here:
- FormattingState::NodeState::width_constraint
- FormattingState::NodeState::height_constraint
They are of type SizeConstraint and can be one of None, MinContent,
or MaxContent. The default is None.
When performing an IntrinsicSizeDetermination layout, we now assign
a size constraint to the box we're trying to determine the intrinsic
size of, which is then honored by using two new helpers to query
the dimensions of containing blocks:
- FormattingContext::containing_block_width_for(Box)
- FormattingContext::containing_block_height_for(Box)
If there's a relevant constraint in effect on the Box, the size of
its containing block is adjusted accordingly.
This is essentially an implementation of the "available space"
constraints from CSS-SIZING-3. I'm sure some things will break from
this, and we'll have to deal with that separately.
Spec: https://drafts.csswg.org/css-sizing-3/#available
63 lines
1.5 KiB
C++
63 lines
1.5 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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#pragma once
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#include <AK/Utf8View.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Layout/Node.h>
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namespace Web::Layout {
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class LineBoxFragment;
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class TextNode : public Node {
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public:
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TextNode(DOM::Document&, DOM::Text&);
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virtual ~TextNode() override;
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const DOM::Text& dom_node() const { return static_cast<const DOM::Text&>(*Node::dom_node()); }
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String const& text_for_rendering() const { return m_text_for_rendering; }
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struct Chunk {
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Utf8View view;
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size_t start { 0 };
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size_t length { 0 };
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bool has_breaking_newline { false };
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bool is_all_whitespace { false };
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};
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class ChunkIterator {
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public:
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ChunkIterator(StringView text, LayoutMode, bool wrap_lines, bool respect_linebreaks);
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Optional<Chunk> next();
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private:
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Optional<Chunk> try_commit_chunk(Utf8View::Iterator const& start, Utf8View::Iterator const& end, bool has_breaking_newline) const;
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const LayoutMode m_layout_mode;
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bool const m_wrap_lines;
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bool const m_respect_linebreaks;
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Utf8View m_utf8_view;
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Utf8View::Iterator m_iterator;
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};
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void compute_text_for_rendering(bool collapse);
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virtual RefPtr<Painting::Paintable> create_paintable() const override;
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private:
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virtual bool is_text_node() const final { return true; }
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String m_text_for_rendering;
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};
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template<>
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inline bool Node::fast_is<TextNode>() const { return is_text_node(); }
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}
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