ladybird/Libraries/LibHTML/Layout/LayoutBlock.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <LibHTML/Layout/LayoutBox.h>
#include <LibHTML/Layout/LineBox.h>

class Element;

class LayoutBlock : public LayoutBox {
public:
    LayoutBlock(const Node*, NonnullRefPtr<StyleProperties>);
    virtual ~LayoutBlock() override;

    virtual const char* class_name() const override { return "LayoutBlock"; }

    virtual void layout() override;
    virtual void render(RenderingContext&) override;

    virtual LayoutNode& inline_wrapper() override;

    Vector<LineBox>& line_boxes() { return m_line_boxes; }
    const Vector<LineBox>& line_boxes() const { return m_line_boxes; }

    LineBox& ensure_last_line_box();
    LineBox& add_line_box();

    virtual HitTestResult hit_test(const Gfx::Point&) const override;

    LayoutBlock* previous_sibling() { return to<LayoutBlock>(LayoutNode::previous_sibling()); }
    const LayoutBlock* previous_sibling() const { return to<LayoutBlock>(LayoutNode::previous_sibling()); }
    LayoutBlock* next_sibling() { return to<LayoutBlock>(LayoutNode::next_sibling()); }
    const LayoutBlock* next_sibling() const { return to<LayoutBlock>(LayoutNode::next_sibling()); }

    template<typename Callback>
    void for_each_fragment(Callback);
    template<typename Callback>
    void for_each_fragment(Callback) const;

private:
    virtual bool is_block() const override { return true; }

    NonnullRefPtr<StyleProperties> style_for_anonymous_block() const;

    void layout_inline_children();
    void layout_block_children();

    void compute_width();
    void compute_position();
    void compute_height();

    Vector<LineBox> m_line_boxes;
};

template<typename Callback>
void LayoutBlock::for_each_fragment(Callback callback)
{
    for (auto& line_box : line_boxes()) {
        for (auto& fragment : line_box.fragments()) {
            if (callback(fragment) == IterationDecision::Break)
                return;
        }
    }
}

template<typename Callback>
void LayoutBlock::for_each_fragment(Callback callback) const
{
    for (auto& line_box : line_boxes()) {
        for (auto& fragment : line_box.fragments()) {
            if (callback(fragment) == IterationDecision::Break)
                return;
        }
    }
}

template<>
inline bool is<LayoutBlock>(const LayoutNode& node)
{
    return node.is_block();
}