0532d7d255
Until now, some formatting contexts (BFC in particular) have been assigning size to the root box. This is really the responsibility of the parent formatting context, so let's stop doing it. To keep position:absolute working, parent formatting contexts now notify child contexts when the child's root box has been sized. (Note that the important thing here is for the child root to have its final used height before it's able to place bottom-relative boxes.) This breaks flexbox layout in some ways, but we'll have to address those by improving the spec compliance of FFC.)
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/*
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* Copyright (c) 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/OwnPtr.h>
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#include <LibWeb/Forward.h>
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namespace Web::Layout {
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class FormattingContext {
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public:
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virtual ~FormattingContext();
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enum class Type {
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Block,
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Inline,
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Flex,
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Table,
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SVG,
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};
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virtual void run(Box&, LayoutMode) = 0;
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Box& context_box() { return m_context_box; }
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const Box& context_box() const { return m_context_box; }
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FormattingContext* parent() { return m_parent; }
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const FormattingContext* parent() const { return m_parent; }
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Type type() const { return m_type; }
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bool is_block_formatting_context() const { return type() == Type::Block; }
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virtual bool inhibits_floating() const { return false; }
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static bool creates_block_formatting_context(const Box&);
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static float compute_width_for_replaced_element(const ReplacedBox&);
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static float compute_height_for_replaced_element(const ReplacedBox&);
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OwnPtr<FormattingContext> create_independent_formatting_context_if_needed(Box& child_box);
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virtual void parent_context_did_dimension_child_root_box() { }
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protected:
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FormattingContext(Type, Box&, FormattingContext* parent = nullptr);
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OwnPtr<FormattingContext> layout_inside(Box&, LayoutMode);
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struct ShrinkToFitResult {
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float preferred_width { 0 };
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float preferred_minimum_width { 0 };
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};
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static float tentative_width_for_replaced_element(const ReplacedBox&, const CSS::Length& width);
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static float tentative_height_for_replaced_element(const ReplacedBox&, const CSS::Length& height);
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enum ConsiderFloats {
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Yes,
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No,
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};
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static float compute_auto_height_for_block_level_element(Box const&, ConsiderFloats consider_floats = ConsiderFloats::Yes);
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ShrinkToFitResult calculate_shrink_to_fit_widths(Box&);
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void layout_absolutely_positioned_element(Box&);
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void compute_width_for_absolutely_positioned_element(Box&);
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void compute_width_for_absolutely_positioned_non_replaced_element(Box&);
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void compute_width_for_absolutely_positioned_replaced_element(ReplacedBox&);
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void compute_height_for_absolutely_positioned_element(Box&);
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void compute_height_for_absolutely_positioned_non_replaced_element(Box&);
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void compute_height_for_absolutely_positioned_replaced_element(ReplacedBox&);
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Type m_type {};
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FormattingContext* m_parent { nullptr };
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Box& m_context_box;
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};
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}
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