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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef nsTableCellFrame_h__
#define nsTableCellFrame_h__
#include "mozilla/Attributes.h"
#include "celldata.h"
#include "nsITableCellLayout.h"
#include "nscore.h"
#include "nsContainerFrame.h"
#include "mozilla/ComputedStyle.h"
#include "nsIPercentBSizeObserver.h"
#include "nsTArray.h"
#include "nsTableRowFrame.h"
#include "mozilla/WritingModes.h"
namespace mozilla {
class PresShell;
class ScrollContainerFrame;
} // namespace mozilla
* nsTableCellFrame
* data structure to maintain information about a single table cell's frame
* NOTE: frames are not ref counted. We expose addref and release here
* so we can change that decsion in the future. Users of nsITableCellLayout
* should refcount correctly as if this object is being ref counted, though
* no actual support is under the hood.
* @author sclark
class nsTableCellFrame : public nsContainerFrame,
public nsITableCellLayout,
public nsIPercentBSizeObserver {
friend nsTableCellFrame* NS_NewTableCellFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle,
nsTableFrame* aTableFrame);
nsTableCellFrame(ComputedStyle* aStyle, nsTableFrame* aTableFrame)
: nsTableCellFrame(aStyle, aTableFrame, kClassID) {}
mozilla::ScrollContainerFrame* GetScrollTargetFrame() const final;
nsTableRowFrame* GetTableRowFrame() const {
nsIFrame* parent = GetParent();
MOZ_ASSERT(parent && parent->IsTableRowFrame());
return static_cast<nsTableRowFrame*>(parent);
nsTableFrame* GetTableFrame() const {
return GetTableRowFrame()->GetTableFrame();
void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
void Destroy(DestroyContext&) override;
mozilla::a11y::AccType AccessibleType() override;
nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) override;
/** @see nsIFrame::DidSetComputedStyle */
void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) override;
#ifdef DEBUG
// Our anonymous block frame is the content insertion frame so these
// methods should never be called:
void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
const nsLineList::iterator* aPrevFrameLine,
nsFrameList&& aFrameList) override;
void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
nsContainerFrame* GetContentInsertionFrame() override {
return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
nsIFrame* CellContentFrame() const;
nsMargin GetUsedMargin() const override;
void NotifyPercentBSize(const ReflowInput& aReflowInput) override;
bool NeedsToObserve(const ReflowInput& aReflowInput) override;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
virtual void ProcessBorders(nsTableFrame* aFrame,
nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists);
nscoord GetMinISize(gfxContext* aRenderingContext) override;
nscoord GetPrefISize(gfxContext* aRenderingContext) override;
IntrinsicSizeOffsetData IntrinsicISizeOffsets(
nscoord aPercentageBasis = NS_UNCONSTRAINEDSIZE) override;
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
nsresult GetFrameName(nsAString& aResult) const override;
// Align the cell's child frame within the cell.
void BlockDirAlignChild(mozilla::WritingMode aWM, nscoord aMaxAscent,
mozilla::ForceAlignTopForTableCell aForceAlignTop);
* Get the value of vertical-align adjusted for CSS 2's rules for a
* table cell, which means the result is always
* StyleVerticalAlignKeyword::{Top,Middle,Bottom,Baseline}.
virtual mozilla::StyleVerticalAlignKeyword GetVerticalAlign() const;
bool HasVerticalAlignBaseline() const {
return GetVerticalAlign() == mozilla::StyleVerticalAlignKeyword::Baseline &&
* Get the first-line baseline of the cell relative to its block-start border
* edge, as if the cell were vertically aligned to the top of the row.
nscoord GetCellBaseline() const;
* return the cell's specified row span. this is what was specified in the
* content model or in the style info, and is always >= 0.
* to get the effective row span (the actual value that applies), use
* GetEffectiveRowSpan()
* @see nsTableFrame::GetEffectiveRowSpan()
int32_t GetRowSpan();
// there is no set row index because row index depends on the cell's parent
// row only
// Return our cell content frame.
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
/*---------------- nsITableCellLayout methods ------------------------*/
* return the cell's starting row index (starting at 0 for the first row).
* for continued cell frames the row index is that of the cell's first-in-flow
* and the column index (starting at 0 for the first column
NS_IMETHOD GetCellIndexes(int32_t& aRowIndex, int32_t& aColIndex) override;
/** return the mapped cell's row index (starting at 0 for the first row) */
uint32_t RowIndex() const {
return static_cast<nsTableRowFrame*>(GetParent())->GetRowIndex();
* return the cell's specified col span. this is what was specified in the
* content model or in the style info, and is always >= 1.
* to get the effective col span (the actual value that applies), use
* GetEffectiveColSpan()
* @see nsTableFrame::GetEffectiveColSpan()
int32_t GetColSpan();
/** return the cell's column index (starting at 0 for the first column) */
uint32_t ColIndex() const {
// NOTE: We copy this from previous continuations, and we don't ever have
// dynamic updates when tables split, so our mColIndex always matches our
// first continuation's.
MOZ_ASSERT(static_cast<nsTableCellFrame*>(FirstContinuation())->mColIndex ==
"mColIndex out of sync with first continuation");
return mColIndex;
void SetColIndex(int32_t aColIndex);
// Get or set the available isize given to this frame during its last reflow.
nscoord GetPriorAvailISize() const { return mPriorAvailISize; }
void SetPriorAvailISize(nscoord aPriorAvailISize) {
mPriorAvailISize = aPriorAvailISize;
// Get or set the desired size returned by this frame during its last reflow.
mozilla::LogicalSize GetDesiredSize() const { return mDesiredSize; }
void SetDesiredSize(const ReflowOutput& aDesiredSize) {
mDesiredSize = aDesiredSize.Size(GetWritingMode());
bool GetContentEmpty() const {
void SetContentEmpty(bool aContentEmpty) {
AddOrRemoveStateBits(NS_TABLE_CELL_CONTENT_EMPTY, aContentEmpty);
nsTableCellFrame* GetNextCell() const {
nsIFrame* sibling = GetNextSibling();
!sibling || static_cast<nsTableCellFrame*>(do_QueryFrame(sibling)),
"How do we have a non-cell sibling?");
return static_cast<nsTableCellFrame*>(sibling);
virtual mozilla::LogicalMargin GetBorderWidth(mozilla::WritingMode aWM) const;
virtual bool BCBordersChanged() const { return false; }
void DecorateForSelection(DrawTarget* aDrawTarget, nsPoint aPt);
bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) override;
void InvalidateFrame(uint32_t aDisplayItemKey = 0,
bool aRebuildDisplayItems = true) override;
void InvalidateFrameWithRect(const nsRect& aRect,
uint32_t aDisplayItemKey = 0,
bool aRebuildDisplayItems = true) override;
void InvalidateFrameForRemoval() override { InvalidateFrameSubtree(); }
bool ShouldPaintBordersAndBackgrounds() const;
bool ShouldPaintBackground(nsDisplayListBuilder* aBuilder);
nsTableCellFrame(ComputedStyle* aStyle, nsTableFrame* aTableFrame,
ClassID aID);
LogicalSides GetLogicalSkipSides() const override;
* GetBorderOverflow says how far the cell's own borders extend
* outside its own bounds. In the separated borders model this should
* just be zero (as it is for most frames), but in the collapsed
* borders model (for which nsBCTableCellFrame overrides this virtual
* method), it considers the extents of the collapsed border.
virtual nsMargin GetBorderOverflow();
friend class nsTableRowFrame;
// The starting column for this cell
uint32_t mColIndex = 0;
// The avail isize during the last reflow
nscoord mPriorAvailISize = 0;
// The last desired inline and block size
mozilla::LogicalSize mDesiredSize;
class nsBCTableCellFrame final : public nsTableCellFrame {
nsBCTableCellFrame(ComputedStyle* aStyle, nsTableFrame* aTableFrame);
void Reflow(nsPresContext*, ReflowOutput&, const ReflowInput&,
nsReflowStatus&) override;
nsMargin GetUsedBorder() const override;
bool BCBordersChanged() const override {
return GetUsedBorder() != mLastUsedBorder;
// Get the *inner half of the border only*, in twips.
mozilla::LogicalMargin GetBorderWidth(
mozilla::WritingMode aWM) const override;
// Get the *inner half of the border only*
nscoord GetBorderWidth(mozilla::LogicalSide aSide) const;
// Set the full (both halves) width of the border
void SetBorderWidth(mozilla::LogicalSide aSide, nscoord aValue);
nsMargin GetBorderOverflow() override;
nsresult GetFrameName(nsAString& aResult) const override;
// These are the entire width of the border (the cell edge contains only
// the inner half).
nscoord mBStartBorder = 0;
nscoord mIEndBorder = 0;
nscoord mBEndBorder = 0;
nscoord mIStartBorder = 0;
nsMargin mLastUsedBorder;
// Implemented here because that's a sane-ish way to make the includes work out.
inline nsTableCellFrame* nsTableRowFrame::GetFirstCell() const {
nsIFrame* firstChild = mFrames.FirstChild();
!firstChild || static_cast<nsTableCellFrame*>(do_QueryFrame(firstChild)),
"How do we have a non-cell child?");
return static_cast<nsTableCellFrame*>(firstChild);