1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* 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 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 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;
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; }
bool PaintedOutputOfObjectHasNoEffectRegardlessOfSize() const final;
void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
LayoutTable* Table() const final;
unsigned span_;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableCol, IsLayoutTableCol());
} // namespace blink
#endif
|
