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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, 2013 Apple Inc.
* All rights reserved.
*
* 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 LayoutTableRow_h
#define LayoutTableRow_h
#include "core/CoreExport.h"
#include "core/layout/LayoutTableSection.h"
namespace blink {
// There is a window of opportunity to read |m_rowIndex| before it is set when
// inserting the LayoutTableRow or during LayoutTableSection::recalcCells.
// This value is used to detect that case.
static const unsigned unsetRowIndex = 0x7FFFFFFF;
static const unsigned maxRowIndex = 0x7FFFFFFE; // 2,147,483,646
// LayoutTableRow is used to represent a table row (display: table-row).
//
// LayoutTableRow is a simple object. The reason is that most operations
// have to be coordinated at the LayoutTableSection level and thus are
// handled in LayoutTableSection (see e.g. layoutRows).
//
// The table model prevents any layout overflow on rows (but allow visual
// overflow). For row height, it is defined as "the maximum of the row's
// computed 'height', the computed 'height' of each cell in the row, and
// the minimum height (MIN) required by the cells" (CSS 2.1 - section 17.5.3).
// Note that this means that rows and cells differ from other LayoutObject as
// they will ignore 'height' in some situation (when other LayoutObject just
// allow some layout overflow to occur).
//
// LayoutTableRow doesn't establish a containing block for the underlying
// LayoutTableCells. That's why it inherits from LayoutTableBoxComponent and not
// LayoutBlock.
// One oddity is that LayoutTableRow doesn't establish a new coordinate system
// for its children. LayoutTableCells are positioned with respect to the
// enclosing LayoutTableSection (this object's parent()). This particularity is
// why functions accumulating offset while walking the tree have to special case
// LayoutTableRow (see e.g. PaintInvalidationState or
// LayoutBox::positionFromPoint()).
//
// LayoutTableRow is also positioned with respect to the enclosing
// LayoutTableSection. See LayoutTableSection::layoutRows() for the placement
// logic.
class CORE_EXPORT LayoutTableRow final : public LayoutTableBoxComponent {
public:
explicit LayoutTableRow(Element*);
LayoutTableCell* firstCell() const;
LayoutTableCell* lastCell() const;
LayoutTableRow* previousRow() const;
LayoutTableRow* nextRow() const;
LayoutTableSection* section() const { return toLayoutTableSection(parent()); }
LayoutTable* table() const { return toLayoutTable(parent()->parent()); }
static LayoutTableRow* createAnonymous(Document*);
static LayoutTableRow* createAnonymousWithParent(const LayoutObject*);
LayoutBox* createAnonymousBoxWithSameTypeAs(
const LayoutObject* parent) const override {
return createAnonymousWithParent(parent);
}
void setRowIndex(unsigned rowIndex) {
if (UNLIKELY(rowIndex > maxRowIndex))
CRASH();
m_rowIndex = rowIndex;
}
bool rowIndexWasSet() const { return m_rowIndex != unsetRowIndex; }
unsigned rowIndex() const {
ASSERT(rowIndexWasSet());
ASSERT(
!section() ||
!section()
->needsCellRecalc()); // index may be bogus if cells need recalc.
return m_rowIndex;
}
const BorderValue& borderAdjoiningTableStart() const {
if (section()->hasSameDirectionAs(table()))
return style()->borderStart();
return style()->borderEnd();
}
const BorderValue& borderAdjoiningTableEnd() const {
if (section()->hasSameDirectionAs(table()))
return style()->borderEnd();
return style()->borderStart();
}
const BorderValue& borderAdjoiningStartCell(const LayoutTableCell*) const;
const BorderValue& borderAdjoiningEndCell(const LayoutTableCell*) const;
bool nodeAtPoint(HitTestResult&,
const HitTestLocation& locationInContainer,
const LayoutPoint& accumulatedOffset,
HitTestAction) override;
PaginationBreakability getPaginationBreakability() const final;
void computeOverflow();
const char* name() const override { return "LayoutTableRow"; }
// Whether a row has opaque background depends on many factors, e.g. border
// spacing, border collapsing, missing cells, etc.
// For simplicity, just conservatively assume all table rows are not opaque.
bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect&,
unsigned) const override {
return false;
}
bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const override {
return false;
}
bool isFirstRowInSectionAfterHeader() const;
private:
void addOverflowFromCell(const LayoutTableCell*);
bool isOfType(LayoutObjectType type) const override {
return type == LayoutObjectTableRow ||
LayoutTableBoxComponent::isOfType(type);
}
void willBeRemovedFromTree() override;
void addChild(LayoutObject* child,
LayoutObject* beforeChild = nullptr) override;
void layout() override;
PaintLayerType layerTypeRequired() const override {
if (hasTransformRelatedProperty() || hasHiddenBackface() || hasClipPath() ||
createsGroup() || style()->shouldCompositeForCurrentAnimations() ||
isStickyPositioned() || style()->hasCompositorProxy())
return NormalPaintLayer;
if (hasOverflowClip())
return OverflowClipPaintLayer;
return NoPaintLayer;
}
void paint(const PaintInfo&, const LayoutPoint&) const override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
void nextSibling() const = delete;
void previousSibling() const = delete;
// This field should never be read directly. It should be read through
// rowIndex() above instead. This is to ensure that we never read this
// value before it is set.
unsigned m_rowIndex : 31;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableRow, isTableRow());
inline LayoutTableRow* LayoutTableRow::previousRow() const {
return toLayoutTableRow(LayoutObject::previousSibling());
}
inline LayoutTableRow* LayoutTableRow::nextRow() const {
return toLayoutTableRow(LayoutObject::nextSibling());
}
inline LayoutTableRow* LayoutTableSection::firstRow() const {
return toLayoutTableRow(firstChild());
}
inline LayoutTableRow* LayoutTableSection::lastRow() const {
return toLayoutTableRow(lastChild());
}
} // namespace blink
#endif // LayoutTableRow_h
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