text: /*
   * Copyright (C) 1997 Martin Jones (mjones@kde.org)
   *           (C) 1997 Torben Weis (weis@kde.org)
   *           (C) 1998 Waldo Bastian (bastian@kde.org)
   *           (C) 1999 Lars Knoll (knoll@kde.org)
   *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
   * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_TABLE_COL_H_
  #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_TABLE_COL_H_
  
  #include "third_party/blink/renderer/core/layout/layout_table_box_component.h"
  
  namespace blink {
  
  class LayoutTable;
  
  // LayoutTableCol is used to represent table column or column groups
  // (display: table-column and display: table-column-group).
  //
  // The reason to use the same LayoutObject is that both objects behave in a very
  // similar way. The main difference between the 2 is that table-column-group
  // allows table-column children, when table-column don't.
  // Note that this matches how <col> and <colgroup> map to the same class:
  // HTMLTableColElement.
  //
  // In HTML and CSS, table columns and colgroups don't own the cells, they are
  // descendants of the rows.
  // As such table columns and colgroups have a very limited scope in the table:
  // - column / cell sizing (the 'width' property)
  // - background painting (the 'background' property).
  // - border collapse resolution
  //   (http://www.w3.org/TR/CSS21/tables.html#border-conflict-resolution)
  //
  // See http://www.w3.org/TR/CSS21/tables.html#columns for the standard.
  // Note that we don't implement the "visibility: collapse" inheritance to the
  // cells.
  //
  // Because table columns and column groups are placeholder elements (see
  // previous paragraph), they are never laid out and layout() should not be
  // called on them.
  class LayoutTableCol final : public LayoutTableBoxComponent {
   public:
    explicit LayoutTableCol(Element*);
  
    void ClearIntrinsicLogicalWidthsDirtyBits();
  
    // The 'span' attribute in HTML.
    // For CSS table columns or colgroups, this is always 1.
    unsigned Span() const { return span_; }
  
    bool IsTableColumnGroupWithColumnChildren() { return FirstChild(); }
    bool IsTableColumn() const {
      return StyleRef().Display() == EDisplay::kTableColumn;
    }
    bool IsTableColumnGroup() const {
      return StyleRef().Display() == EDisplay::kTableColumnGroup;
    }
  
    LayoutTableCol* EnclosingColumnGroup() const;
  
    // Returns the next column or column-group.
    LayoutTableCol* NextColumn() const;
  
    const char* GetName() const override { return "LayoutTableCol"; }
  
   private:
    bool IsOfType(LayoutObjectType type) const override {
      return type == kLayoutObjectLayoutTableCol || LayoutBox::IsOfType(type);
    }
    void UpdateFromElement() override;
  
    MinMaxSizes PreferredLogicalWidths() const override {
      NOTREACHED();
      return MinMaxSizes();
    }
    MinMaxSizes ComputeIntrinsicLogicalWidths() const final {
      NOTREACHED();
      return MinMaxSizes();
    }
  
    void InsertedIntoTree() override;
    void WillBeRemovedFromTree() override;
  
    bool IsChildAllowed(LayoutObject*, const ComputedStyle&) const override;
    bool CanHaveChildren() const override;
    PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; }
  
    void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
  
    LayoutTable* Table() const final;
  
    unsigned span_;
  };
  
  DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableCol, IsLayoutTableCol());
  
  }  // namespace blink
  
  #endif
  