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https://github.com/LadybirdBrowser/ladybird
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df4f0eb3b2
The scrollport size was previously fetched at refresh time from the scroll ancestor paintable. Since it doesn't change between layouts, precompute it alongside the other sticky constraints.
81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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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/RefCounted.h>
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#include <LibGC/Weak.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::Painting {
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struct StickyInsets {
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Optional<CSSPixels> top;
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Optional<CSSPixels> right;
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Optional<CSSPixels> bottom;
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Optional<CSSPixels> left;
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};
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struct StickyConstraints {
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CSSPixelPoint position_relative_to_scroll_ancestor;
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CSSPixelSize border_box_size;
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CSSPixelSize scrollport_size;
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CSSPixelRect containing_block_region;
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bool needs_parent_offset_adjustment { false };
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StickyInsets insets;
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};
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class ScrollFrame : public RefCounted<ScrollFrame> {
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public:
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ScrollFrame(PaintableBox const& paintable_box, size_t id, bool sticky, RefPtr<ScrollFrame const> parent);
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PaintableBox const& paintable_box() const { return *m_paintable_box; }
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size_t id() const { return m_id; }
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bool is_sticky() const { return m_sticky; }
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CSSPixelPoint cumulative_offset() const
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{
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return m_cached_cumulative_offset.ensure([&] {
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auto offset = m_own_offset;
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if (m_parent)
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offset += m_parent->cumulative_offset();
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return offset;
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});
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}
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void set_own_offset(CSSPixelPoint offset)
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{
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m_cached_cumulative_offset.clear();
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m_own_offset = offset;
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}
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RefPtr<ScrollFrame const> parent() const { return m_parent; }
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RefPtr<ScrollFrame const> nearest_scrolling_ancestor() const;
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void set_sticky_constraints(StickyConstraints constraints) { m_sticky_constraints = constraints; }
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bool has_sticky_constraints() const { return m_sticky_constraints.has_value(); }
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StickyConstraints const& sticky_constraints() const { return m_sticky_constraints.value(); }
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private:
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friend class ScrollStateSnapshot;
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GC::Weak<PaintableBox> m_paintable_box;
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size_t m_id { 0 };
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bool m_sticky { false };
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RefPtr<ScrollFrame const> m_parent;
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CSSPixelPoint m_own_offset;
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Optional<StickyConstraints> m_sticky_constraints;
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// Caching here relies on the fact that offsets of all scroll frames are invalidated when any of them changes,
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// so we don't need to worry about invalidating the cache when the parent's offset changes.
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mutable Optional<CSSPixelPoint> m_cached_cumulative_offset;
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};
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}
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