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/*
* 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 LayoutTableCol_h
#define LayoutTableCol_h
#include "core/layout/LayoutTableBoxComponent.h"
namespace blink {
class LayoutTable;
class LayoutTableCell;
// 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 clearPreferredLogicalWidthsDirtyBits();
// The 'span' attribute in HTML.
// For CSS table columns or colgroups, this is always 1.
unsigned span() const { return m_span; }
bool isTableColumnGroupWithColumnChildren() { return firstChild(); }
bool isTableColumn() const {
return style()->display() == EDisplay::TableColumn;
}
bool isTableColumnGroup() const {
return style()->display() == EDisplay::TableColumnGroup;
}
LayoutTableCol* enclosingColumnGroup() const;
// Returns the next column or column-group.
LayoutTableCol* nextColumn() const;
const BorderValue& borderAdjoiningCellStartBorder(
const LayoutTableCell*) const;
const BorderValue& borderAdjoiningCellEndBorder(const LayoutTableCell*) const;
const BorderValue& borderAdjoiningCellBefore(const LayoutTableCell*) const;
const BorderValue& borderAdjoiningCellAfter(const LayoutTableCell*) const;
const char* name() const override { return "LayoutTableCol"; }
private:
bool isOfType(LayoutObjectType type) const override {
return type == LayoutObjectLayoutTableCol || LayoutBox::isOfType(type);
}
void updateFromElement() override;
void computePreferredLogicalWidths() override { ASSERT_NOT_REACHED(); }
void insertedIntoTree() override;
void willBeRemovedFromTree() override;
bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
bool canHaveChildren() const override;
PaintLayerType layerTypeRequired() const override { return NoPaintLayer; }
LayoutRect localVisualRect() const override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
LayoutTable* table() const;
unsigned m_span;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableCol, isLayoutTableCol());
} // namespace blink
#endif
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