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ec50525675
Instead, compute them on demand. This affects ReplacedBox and its subclasses. This commit is centered around a new Box::auto_content_box_size method. It returns a SizeWithAspectRatio representing the natural size of a replaced element, or the size derived from attributes for text input and textarea. These values are used when the corresponding axis is auto or indefinite. Although introducing this API choke-point for sizing replaced and replaced-like elements was the main goal, it's notable that layout becomes more robust in the face of dynamic changes due to reduced potential for stale size values (at the cost of extra calculations and allocations).
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.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/OwnPtr.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibWeb/CSS/Sizing.h>
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#include <LibWeb/Export.h>
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#include <LibWeb/Layout/Node.h>
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namespace Web::Layout {
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struct LineBoxFragmentCoordinate {
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size_t line_box_index { 0 };
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size_t fragment_index { 0 };
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};
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struct IntrinsicSizes {
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Optional<CSSPixels> min_content_width;
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Optional<CSSPixels> max_content_width;
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HashMap<CSSPixels, Optional<CSSPixels>> min_content_height;
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HashMap<CSSPixels, Optional<CSSPixels>> max_content_height;
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};
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class WEB_API Box : public NodeWithStyleAndBoxModelMetrics {
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GC_CELL(Box, NodeWithStyleAndBoxModelMetrics);
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GC_DECLARE_ALLOCATOR(Box);
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public:
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Painting::PaintableBox const* paintable_box() const;
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Painting::PaintableBox* paintable_box();
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// https://www.w3.org/TR/css-images-3/#natural-dimensions
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virtual CSS::SizeWithAspectRatio natural_size() const { return {}; }
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// When computed width/height is auto, auto_content_box_size gives the fallback content-box size for
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// elements whose used size is determined by natural dimensions, attributes, or defaults other than
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// the generic UA fallback (300x150). Any returned aspect ratio comes from natural dimensions (when
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// available) or may be computed from fallback sizing. Don't confuse this with the CSS preferred
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// aspect ratio.
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CSS::SizeWithAspectRatio auto_content_box_size() const;
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virtual bool has_auto_content_box_size() const { return false; }
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// https://www.w3.org/TR/css-sizing-4/#preferred-aspect-ratio
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Optional<CSSPixelFraction> preferred_aspect_ratio() const;
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bool has_preferred_aspect_ratio() const { return preferred_aspect_ratio().has_value(); }
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virtual ~Box() override;
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virtual void did_set_content_size() { }
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virtual GC::Ptr<Painting::Paintable> create_paintable() const override;
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void add_contained_abspos_child(GC::Ref<Node> child) { m_contained_abspos_children.append(child); }
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void clear_contained_abspos_children() { m_contained_abspos_children.clear(); }
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Vector<GC::Ref<Node>> const& contained_abspos_children() const { return m_contained_abspos_children; }
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virtual void visit_edges(Cell::Visitor&) override;
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IntrinsicSizes& cached_intrinsic_sizes() const
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{
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if (!m_cached_intrinsic_sizes)
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m_cached_intrinsic_sizes = make<IntrinsicSizes>();
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return *m_cached_intrinsic_sizes;
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}
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void reset_cached_intrinsic_sizes() const { m_cached_intrinsic_sizes.clear(); }
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protected:
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Box(DOM::Document&, DOM::Node*, GC::Ref<CSS::ComputedProperties>);
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Box(DOM::Document&, DOM::Node*, NonnullOwnPtr<CSS::ComputedValues>);
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virtual CSS::SizeWithAspectRatio compute_auto_content_box_size() const { return natural_size(); }
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private:
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virtual bool is_box() const final { return true; }
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Vector<GC::Ref<Node>> m_contained_abspos_children;
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OwnPtr<IntrinsicSizes> mutable m_cached_intrinsic_sizes;
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};
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template<>
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inline bool Node::fast_is<Box>() const { return is_box(); }
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}
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