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e73ad78ba6
This display type is implemented using a LayoutBlock that is_inline(). Basically it behaves like a block internally, and its children are laid out in the normal block layout fashion. Externally however, it behaves like an atomic inline-level box. Layout of inline-block boxes happens in three stages: 1. The outer dimensions of the block are computed during the recursive normal layout pass. We skip positioning, but lay out children. 2. Later on, during line layout in the *containing block*, the inline block now contributes a linebox fragment. When linebox fragments are positioned, we learn the final position of the inline block. That's when we set the inline block's position. 3. We re-layout the inline block's children once again. This is done to make sure they end up in the right position. The layout tree doesn't use relative offsets, so after we position the inline block in (2), its children will not have its positions updated. Relayout moves all children of inline blocks to the right place. This is a rather naive approach but it does get the basic behavior into place so we can iterate on it. :^)
111 lines
3.7 KiB
C++
111 lines
3.7 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() 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::Point&) 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) override;
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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_inline_children();
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void layout_block_children();
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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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Vector<LineBox> m_line_boxes;
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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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