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LibWeb: Add Layout::LineBuilder class for incremental line box layout

This class will be used to place items on lines incrementally instead of
the current two-phase approach.
This commit is contained in:
Andreas Kling 2022-01-19 11:57:58 +01:00
parent ae301d2b02
commit 00bde9ca51
4 changed files with 166 additions and 0 deletions

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/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/Layout/InlineFormattingContext.h>
namespace Web::Layout {
class LineBuilder {
AK_MAKE_NONCOPYABLE(LineBuilder);
AK_MAKE_NONMOVABLE(LineBuilder);
public:
explicit LineBuilder(InlineFormattingContext&);
~LineBuilder();
void break_line();
void begin_new_line();
void append_box(Box&);
void append_text_chunk(TextNode&, size_t offset_in_node, size_t length_in_node, float width, float height);
void break_if_needed(LayoutMode, float next_item_width);
float available_width_for_current_line() const { return m_available_width_for_current_line; }
void update_last_line();
private:
InlineFormattingContext& m_context;
float m_available_width_for_current_line { 0 };
float m_current_y { 0 };
float m_max_height_on_current_line { 0 };
};
}