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c7d9229a0f
Previously, layout recursively performed these steps (roughly): 1. Compute own width 2. Compute own position 3. Layout in-flow children 4. Compute own height 5. Layout absolutely positioned descendants However, step (2) was pretty inconsistent. Some things computed their own position, others had their parent do it for them, etc. To get closer to CSS spec language, and make things easier in general, this patch reorganizes the algorithm into: 1. Compute own width & height 2. Compute width & height of in-flow managed descendants 3. Move in-flow managed descendants to their final position 4. Layout absolutely positioned descendants Block layout is now driven by the containing block, which will iterate the descendants it's responsible for. There are a lot of inefficient patterns in this logic right now, but they can easily be replaced with better iteration functions once we settle on a long-term architecture. Since the ICB (LayoutDocument) is at (0, 0), it doesn't rely on a containing block to move it into place. This code is still evolving along with my understanding of CSS layout, so it's likely that we'll reorganize this again sooner or later. :^)
84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Layout/LayoutBox.h>
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namespace Web {
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class LayoutReplaced : public LayoutBox {
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public:
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LayoutReplaced(const Element&, NonnullRefPtr<StyleProperties>);
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virtual ~LayoutReplaced() override;
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const Element& node() const { return to<Element>(*LayoutNode::node()); }
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Element& node() { return to<Element>(*LayoutNode::node()); }
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virtual bool is_replaced() const final { return true; }
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bool has_intrinsic_width() const { return m_has_intrinsic_width; }
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bool has_intrinsic_height() const { return m_has_intrinsic_height; }
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bool has_intrinsic_ratio() const { return m_has_intrinsic_ratio; }
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float intrinsic_width() const { return m_intrinsic_width; }
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float intrinsic_height() const { return m_intrinsic_height; }
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float intrinsic_ratio() const { return m_intrinsic_ratio; }
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void set_has_intrinsic_width(bool has) { m_has_intrinsic_width = has; }
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void set_has_intrinsic_height(bool has) { m_has_intrinsic_height = has; }
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void set_has_intrinsic_ratio(bool has) { m_has_intrinsic_ratio = has; }
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void set_intrinsic_width(float width) { m_intrinsic_width = width; }
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void set_intrinsic_height(float height) { m_intrinsic_height = height; }
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void set_intrinsic_ratio(float ratio) { m_intrinsic_ratio = ratio; }
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protected:
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virtual void layout(LayoutMode) override;
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virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
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private:
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float calculate_width() const;
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float calculate_height() const;
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virtual const char* class_name() const override { return "LayoutReplaced"; }
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bool m_has_intrinsic_width { false };
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bool m_has_intrinsic_height { false };
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bool m_has_intrinsic_ratio { false };
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float m_intrinsic_width { 0 };
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float m_intrinsic_height { 0 };
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float m_intrinsic_ratio { 0 };
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};
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template<>
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inline bool is<LayoutReplaced>(const LayoutNode& node)
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{
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return node.is_replaced();
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}
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}
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