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https://github.com/RGBCube/serenity
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137f6d44ec
Fixed position elements have the ICB as their containing block. The magic of fixed positioning is implemented at the rendering stage, where we temporarily translate painting by the current scroll offset. Note that "absolutely positioned" includes both position:absolute and position:fixed.
118 lines
4.1 KiB
C++
118 lines
4.1 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/Layout/LayoutBox.h>
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#include <LibWeb/Layout/LineBox.h>
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namespace Web {
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class Element;
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class LayoutBlock : public LayoutBox {
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public:
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LayoutBlock(const Node*, NonnullRefPtr<StyleProperties>);
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virtual ~LayoutBlock() override;
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virtual const char* class_name() const override { return "LayoutBlock"; }
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virtual void layout(LayoutMode = LayoutMode::Default) override;
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virtual void render(RenderingContext&) override;
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virtual LayoutNode& inline_wrapper() override;
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Vector<LineBox>& line_boxes() { return m_line_boxes; }
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const Vector<LineBox>& line_boxes() const { return m_line_boxes; }
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LineBox& ensure_last_line_box();
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LineBox& add_line_box();
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virtual HitTestResult hit_test(const Gfx::IntPoint&) const override;
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LayoutBlock* previous_sibling() { return to<LayoutBlock>(LayoutNode::previous_sibling()); }
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const LayoutBlock* previous_sibling() const { return to<LayoutBlock>(LayoutNode::previous_sibling()); }
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LayoutBlock* next_sibling() { return to<LayoutBlock>(LayoutNode::next_sibling()); }
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const LayoutBlock* next_sibling() const { return to<LayoutBlock>(LayoutNode::next_sibling()); }
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template<typename Callback>
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void for_each_fragment(Callback);
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template<typename Callback>
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void for_each_fragment(Callback) const;
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virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
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void add_absolutely_positioned_descendant(LayoutBox&);
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size_t absolutely_positioned_descendant_count() const { return m_absolutely_positioned_descendants.size(); }
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protected:
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void compute_width();
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void compute_position();
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void compute_height();
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void layout_absolutely_positioned_descendants();
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private:
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virtual bool is_block() const override { return true; }
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NonnullRefPtr<StyleProperties> style_for_anonymous_block() const;
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void layout_children(LayoutMode);
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void layout_inline_children(LayoutMode);
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void layout_block_children(LayoutMode);
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Vector<LineBox> m_line_boxes;
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HashTable<RefPtr<LayoutBox>> m_absolutely_positioned_descendants;
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};
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template<typename Callback>
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void LayoutBlock::for_each_fragment(Callback callback)
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{
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for (auto& line_box : line_boxes()) {
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for (auto& fragment : line_box.fragments()) {
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if (callback(fragment) == IterationDecision::Break)
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return;
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}
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}
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}
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template<typename Callback>
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void LayoutBlock::for_each_fragment(Callback callback) const
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{
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for (auto& line_box : line_boxes()) {
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for (auto& fragment : line_box.fragments()) {
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if (callback(fragment) == IterationDecision::Break)
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return;
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}
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}
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}
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template<>
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inline bool is<LayoutBlock>(const LayoutNode& node)
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{
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return node.is_block();
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}
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}
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