third_party/WebKit/Source/core/layout/LayoutRuby.h

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * 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
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#ifndef LayoutRuby_h
#define LayoutRuby_h

#include "core/layout/LayoutBlockFlow.h"
#include "core/layout/LayoutInline.h"

namespace blink {

// Following the HTML 5 spec, the box object model for a <ruby> element allows
// several runs of ruby
// bases with their respective ruby texts looks as follows:
//
// 1 LayoutRuby object, corresponding to the whole <ruby> HTML element
//      1+ LayoutRubyRun (anonymous)
//          0 or 1 LayoutRubyText - shuffled to the front in order to re-use
//                                  existing block layouting
//              0-n inline object(s)
//          0 or 1 LayoutRubyBase - contains the inline objects that make up the
//                                  ruby base
//              1-n inline object(s)
//
// Note: <rp> elements are defined as having 'display:none' and thus normally
// are not assigned a layoutObject.
//
// Generated :before/:after content is shunted into anonymous inline blocks

// <ruby> when used as 'display:inline'
class LayoutRubyAsInline final : public LayoutInline {
 public:
  LayoutRubyAsInline(Element*);
  ~LayoutRubyAsInline() override;

  void addChild(LayoutObject* child,
                LayoutObject* beforeChild = nullptr) override;
  void removeChild(LayoutObject* child) override;

  const char* name() const override { return "LayoutRuby (inline)"; }

 protected:
  void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;

 private:
  bool isOfType(LayoutObjectType type) const override {
    return type == LayoutObjectRuby || LayoutInline::isOfType(type);
  }
  bool createsAnonymousWrapper() const override { return true; }
};

// <ruby> when used as 'display:block' or 'display:inline-block'
class LayoutRubyAsBlock final : public LayoutBlockFlow {
 public:
  LayoutRubyAsBlock(Element*);
  ~LayoutRubyAsBlock() override;

  void addChild(LayoutObject* child,
                LayoutObject* beforeChild = nullptr) override;
  void removeChild(LayoutObject* child) override;

  const char* name() const override { return "LayoutRuby (block)"; }

 protected:
  void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;

 private:
  bool isOfType(LayoutObjectType type) const override {
    return type == LayoutObjectRuby || LayoutBlockFlow::isOfType(type);
  }
  bool createsAnonymousWrapper() const override { return true; }
  void removeLeftoverAnonymousBlock(LayoutBlock*) override {
    ASSERT_NOT_REACHED();
  }
};

}  // namespace blink

#endif  // LayoutRuby_h