| /* |
| * 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; |
| |
| // 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 span_; } |
| |
| bool IsTableColumnGroupWithColumnChildren() { return FirstChild(); } |
| bool IsTableColumn() const { |
| return Style()->Display() == EDisplay::kTableColumn; |
| } |
| bool IsTableColumnGroup() const { |
| return Style()->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; |
| void ComputePreferredLogicalWidths() override { NOTREACHED(); } |
| |
| void InsertedIntoTree() override; |
| void WillBeRemovedFromTree() override; |
| |
| bool IsChildAllowed(LayoutObject*, const ComputedStyle&) const override; |
| bool CanHaveChildren() const override; |
| PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; } |
| |
| LayoutRect LocalVisualRect() const override; |
| |
| void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override; |
| |
| LayoutTable* Table() const final; |
| |
| unsigned span_; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableCol, IsLayoutTableCol()); |
| |
| } // namespace blink |
| |
| #endif |