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gecko/layout/tables/nsTableRowGroupFrame.cpp
Gervase Markham ca171eec44 Bug 716478 - update licence to MPL 2.
2012-05-21 12:12:37 +01:00

1883 lines
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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 http://mozilla.org/MPL/2.0/. */
#include "nsCOMPtr.h"
#include "nsTableRowGroupFrame.h"
#include "nsTableRowFrame.h"
#include "nsTableFrame.h"
#include "nsTableCellFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIContent.h"
#include "nsGkAtoms.h"
#include "nsIPresShell.h"
#include "nsCSSRendering.h"
#include "nsHTMLParts.h"
#include "nsCSSFrameConstructor.h"
#include "nsDisplayList.h"
#include "nsCellMap.h"//table cell navigation
using namespace mozilla;
nsTableRowGroupFrame::nsTableRowGroupFrame(nsStyleContext* aContext):
nsContainerFrame(aContext)
{
SetRepeatable(false);
}
nsTableRowGroupFrame::~nsTableRowGroupFrame()
{
}
NS_QUERYFRAME_HEAD(nsTableRowGroupFrame)
NS_QUERYFRAME_ENTRY(nsTableRowGroupFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
PRInt32
nsTableRowGroupFrame::GetRowCount()
{
#ifdef DEBUG
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
NS_ASSERTION(e.get()->GetStyleDisplay()->mDisplay ==
NS_STYLE_DISPLAY_TABLE_ROW,
"Unexpected display");
NS_ASSERTION(e.get()->GetType() == nsGkAtoms::tableRowFrame,
"Unexpected frame type");
}
#endif
return mFrames.GetLength();
}
PRInt32 nsTableRowGroupFrame::GetStartRowIndex()
{
PRInt32 result = -1;
if (mFrames.NotEmpty()) {
NS_ASSERTION(mFrames.FirstChild()->GetType() == nsGkAtoms::tableRowFrame,
"Unexpected frame type");
result = static_cast<nsTableRowFrame*>(mFrames.FirstChild())->GetRowIndex();
}
// if the row group doesn't have any children, get it the hard way
if (-1 == result) {
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
return tableFrame->GetStartRowIndex(this);
}
return result;
}
void nsTableRowGroupFrame::AdjustRowIndices(PRInt32 aRowIndex,
PRInt32 anAdjustment)
{
nsIFrame* rowFrame = GetFirstPrincipalChild();
for ( ; rowFrame; rowFrame = rowFrame->GetNextSibling()) {
if (NS_STYLE_DISPLAY_TABLE_ROW==rowFrame->GetStyleDisplay()->mDisplay) {
PRInt32 index = ((nsTableRowFrame*)rowFrame)->GetRowIndex();
if (index >= aRowIndex)
((nsTableRowFrame *)rowFrame)->SetRowIndex(index+anAdjustment);
}
}
}
nsresult
nsTableRowGroupFrame::InitRepeatedFrame(nsPresContext* aPresContext,
nsTableRowGroupFrame* aHeaderFooterFrame)
{
nsTableRowFrame* copyRowFrame = GetFirstRow();
nsTableRowFrame* originalRowFrame = aHeaderFooterFrame->GetFirstRow();
AddStateBits(NS_REPEATED_ROW_OR_ROWGROUP);
while (copyRowFrame && originalRowFrame) {
copyRowFrame->AddStateBits(NS_REPEATED_ROW_OR_ROWGROUP);
int rowIndex = originalRowFrame->GetRowIndex();
copyRowFrame->SetRowIndex(rowIndex);
// For each table cell frame set its column index
nsTableCellFrame* originalCellFrame = originalRowFrame->GetFirstCell();
nsTableCellFrame* copyCellFrame = copyRowFrame->GetFirstCell();
while (copyCellFrame && originalCellFrame) {
NS_ASSERTION(originalCellFrame->GetContent() == copyCellFrame->GetContent(),
"cell frames have different content");
PRInt32 colIndex;
originalCellFrame->GetColIndex(colIndex);
copyCellFrame->SetColIndex(colIndex);
// Move to the next cell frame
copyCellFrame = copyCellFrame->GetNextCell();
originalCellFrame = originalCellFrame->GetNextCell();
}
// Move to the next row frame
originalRowFrame = originalRowFrame->GetNextRow();
copyRowFrame = copyRowFrame->GetNextRow();
}
return NS_OK;
}
/**
* We need a custom display item for table row backgrounds. This is only used
* when the table row is the root of a stacking context (e.g., has 'opacity').
* Table row backgrounds can extend beyond the row frame bounds, when
* the row contains row-spanning cells.
*/
class nsDisplayTableRowGroupBackground : public nsDisplayTableItem {
public:
nsDisplayTableRowGroupBackground(nsDisplayListBuilder* aBuilder,
nsTableRowGroupFrame* aFrame) :
nsDisplayTableItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayTableRowGroupBackground);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayTableRowGroupBackground() {
MOZ_COUNT_DTOR(nsDisplayTableRowGroupBackground);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx);
NS_DISPLAY_DECL_NAME("TableRowGroupBackground", TYPE_TABLE_ROW_GROUP_BACKGROUND)
};
void
nsDisplayTableRowGroupBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(mFrame);
TableBackgroundPainter painter(tableFrame,
TableBackgroundPainter::eOrigin_TableRowGroup,
mFrame->PresContext(), *aCtx,
mVisibleRect, ToReferenceFrame(),
aBuilder->GetBackgroundPaintFlags());
painter.PaintRowGroup(static_cast<nsTableRowGroupFrame*>(mFrame));
}
// Handle the child-traversal part of DisplayGenericTablePart
static nsresult
DisplayRows(nsDisplayListBuilder* aBuilder, nsFrame* aFrame,
const nsRect& aDirtyRect, const nsDisplayListSet& aLists)
{
nscoord overflowAbove;
nsTableRowGroupFrame* f = static_cast<nsTableRowGroupFrame*>(aFrame);
// Don't try to use the row cursor if we have to descend into placeholders;
// we might have rows containing placeholders, where the row's overflow
// area doesn't intersect the dirty rect but we need to descend into the row
// to see out of flows.
// Note that we really want to check ShouldDescendIntoFrame for all
// the rows in |f|, but that's exactly what we're trying to avoid, so we
// approximate it by checking it for |f|: if it's true for any row
// in |f| then it's true for |f| itself.
nsIFrame* kid = aBuilder->ShouldDescendIntoFrame(f) ?
nsnull : f->GetFirstRowContaining(aDirtyRect.y, &overflowAbove);
if (kid) {
// have a cursor, use it
while (kid) {
if (kid->GetRect().y - overflowAbove >= aDirtyRect.YMost())
break;
nsresult rv = f->BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
kid = kid->GetNextSibling();
}
return NS_OK;
}
// No cursor. Traverse children the hard way and build a cursor while we're at it
nsTableRowGroupFrame::FrameCursorData* cursor = f->SetupRowCursor();
kid = f->GetFirstPrincipalChild();
while (kid) {
nsresult rv = f->BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
if (NS_FAILED(rv)) {
f->ClearRowCursor();
return rv;
}
if (cursor) {
if (!cursor->AppendFrame(kid)) {
f->ClearRowCursor();
return NS_ERROR_OUT_OF_MEMORY;
}
}
kid = kid->GetNextSibling();
}
if (cursor) {
cursor->FinishBuildingCursor();
}
return NS_OK;
}
NS_IMETHODIMP
nsTableRowGroupFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsDisplayTableItem* item = nsnull;
if (IsVisibleInSelection(aBuilder)) {
bool isRoot = aBuilder->IsAtRootOfPseudoStackingContext();
if (isRoot) {
// This background is created regardless of whether this frame is
// visible or not. Visibility decisions are delegated to the
// table background painter.
item = new (aBuilder) nsDisplayTableRowGroupBackground(aBuilder, this);
nsresult rv = aLists.BorderBackground()->AppendNewToTop(item);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return nsTableFrame::DisplayGenericTablePart(aBuilder, this, aDirtyRect,
aLists, item, DisplayRows);
}
PRIntn
nsTableRowGroupFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (nsnull != GetPrevInFlow()) {
skip |= 1 << NS_SIDE_TOP;
}
if (nsnull != GetNextInFlow()) {
skip |= 1 << NS_SIDE_BOTTOM;
}
return skip;
}
// Position and size aKidFrame and update our reflow state. The origin of
// aKidRect is relative to the upper-left origin of our frame
void
nsTableRowGroupFrame::PlaceChild(nsPresContext* aPresContext,
nsRowGroupReflowState& aReflowState,
nsIFrame* aKidFrame,
nsHTMLReflowMetrics& aDesiredSize,
const nsRect& aOriginalKidRect,
const nsRect& aOriginalKidVisualOverflow)
{
bool isFirstReflow =
(aKidFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) != 0;
// Place and size the child
FinishReflowChild(aKidFrame, aPresContext, nsnull, aDesiredSize, 0,
aReflowState.y, 0);
nsTableFrame::InvalidateFrame(aKidFrame, aOriginalKidRect,
aOriginalKidVisualOverflow, isFirstReflow);
// Adjust the running y-offset
aReflowState.y += aDesiredSize.height;
// If our height is constrained then update the available height
if (NS_UNCONSTRAINEDSIZE != aReflowState.availSize.height) {
aReflowState.availSize.height -= aDesiredSize.height;
}
}
void
nsTableRowGroupFrame::InitChildReflowState(nsPresContext& aPresContext,
bool aBorderCollapse,
nsHTMLReflowState& aReflowState)
{
nsMargin collapseBorder;
nsMargin padding(0,0,0,0);
nsMargin* pCollapseBorder = nsnull;
if (aBorderCollapse) {
nsTableRowFrame *rowFrame = do_QueryFrame(aReflowState.frame);
if (rowFrame) {
pCollapseBorder = rowFrame->GetBCBorderWidth(collapseBorder);
}
}
aReflowState.Init(&aPresContext, -1, -1, pCollapseBorder, &padding);
}
static void
CacheRowHeightsForPrinting(nsPresContext* aPresContext,
nsTableRowFrame* aFirstRow)
{
for (nsTableRowFrame* row = aFirstRow; row; row = row->GetNextRow()) {
if (!row->GetPrevInFlow()) {
row->SetHasUnpaginatedHeight(true);
row->SetUnpaginatedHeight(aPresContext, row->GetSize().height);
}
}
}
nsresult
nsTableRowGroupFrame::ReflowChildren(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
nsRowGroupReflowState& aReflowState,
nsReflowStatus& aStatus,
bool* aPageBreakBeforeEnd)
{
if (aPageBreakBeforeEnd)
*aPageBreakBeforeEnd = false;
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
nsresult rv = NS_OK;
const bool borderCollapse = tableFrame->IsBorderCollapse();
nscoord cellSpacingY = tableFrame->GetCellSpacingY();
// XXXldb Should we really be checking this rather than available height?
// (Think about multi-column layout!)
bool isPaginated = aPresContext->IsPaginated() &&
NS_UNCONSTRAINEDSIZE != aReflowState.availSize.height;
bool haveRow = false;
bool reflowAllKids = aReflowState.reflowState.ShouldReflowAllKids() ||
tableFrame->IsGeometryDirty();
bool needToCalcRowHeights = reflowAllKids;
nsIFrame *prevKidFrame = nsnull;
for (nsIFrame* kidFrame = mFrames.FirstChild(); kidFrame;
prevKidFrame = kidFrame, kidFrame = kidFrame->GetNextSibling()) {
nsTableRowFrame *rowFrame = do_QueryFrame(kidFrame);
if (!rowFrame) {
// XXXldb nsCSSFrameConstructor needs to enforce this!
NS_NOTREACHED("yikes, a non-row child");
continue;
}
haveRow = true;
// Reflow the row frame
if (reflowAllKids ||
NS_SUBTREE_DIRTY(kidFrame) ||
(aReflowState.reflowState.mFlags.mSpecialHeightReflow &&
(isPaginated || (kidFrame->GetStateBits() &
NS_FRAME_CONTAINS_RELATIVE_HEIGHT)))) {
nsRect oldKidRect = kidFrame->GetRect();
nsRect oldKidVisualOverflow = kidFrame->GetVisualOverflowRect();
// XXXldb We used to only pass aDesiredSize.mFlags through for the
// incremental reflow codepath.
nsHTMLReflowMetrics desiredSize(aDesiredSize.mFlags);
desiredSize.width = desiredSize.height = 0;
// Reflow the child into the available space, giving it as much height as
// it wants. We'll deal with splitting later after we've computed the row
// heights, taking into account cells with row spans...
nsSize kidAvailSize(aReflowState.availSize.width, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState kidReflowState(aPresContext, aReflowState.reflowState,
kidFrame, kidAvailSize,
-1, -1, false);
InitChildReflowState(*aPresContext, borderCollapse, kidReflowState);
// This can indicate that columns were resized.
if (aReflowState.reflowState.mFlags.mHResize)
kidReflowState.mFlags.mHResize = true;
NS_ASSERTION(kidFrame == mFrames.FirstChild() || prevKidFrame,
"If we're not on the first frame, we should have a "
"previous sibling...");
// If prev row has nonzero YMost, then we can't be at the top of the page
if (prevKidFrame && prevKidFrame->GetRect().YMost() > 0) {
kidReflowState.mFlags.mIsTopOfPage = false;
}
rv = ReflowChild(kidFrame, aPresContext, desiredSize, kidReflowState,
0, aReflowState.y, NS_FRAME_INVALIDATE_ON_MOVE,
aStatus);
// Place the child
PlaceChild(aPresContext, aReflowState, kidFrame, desiredSize,
oldKidRect, oldKidVisualOverflow);
aReflowState.y += cellSpacingY;
if (!reflowAllKids) {
if (IsSimpleRowFrame(aReflowState.tableFrame, kidFrame)) {
// Inform the row of its new height.
rowFrame->DidResize();
// the overflow area may have changed inflate the overflow area
const nsStylePosition *stylePos = GetStylePosition();
nsStyleUnit unit = stylePos->mHeight.GetUnit();
if (aReflowState.tableFrame->IsAutoHeight() &&
unit != eStyleUnit_Coord) {
// Because other cells in the row may need to be aligned
// differently, repaint the entire row
nsRect kidRect(0, aReflowState.y,
desiredSize.width, desiredSize.height);
Invalidate(kidRect);
// Invalidate the area we're offseting. Note that we only
// repaint within our existing frame bounds.
if (kidRect.YMost() < mRect.height) {
nsRect dirtyRect(0, kidRect.YMost(),
mRect.width, mRect.height - kidRect.YMost());
Invalidate(dirtyRect);
}
}
else if (oldKidRect.height != desiredSize.height)
needToCalcRowHeights = true;
} else {
needToCalcRowHeights = true;
}
}
if (isPaginated && aPageBreakBeforeEnd && !*aPageBreakBeforeEnd) {
nsTableRowFrame* nextRow = rowFrame->GetNextRow();
if (nextRow) {
*aPageBreakBeforeEnd = nsTableFrame::PageBreakAfter(kidFrame, nextRow);
}
}
} else {
SlideChild(aReflowState, kidFrame);
// Adjust the running y-offset so we know where the next row should be placed
nscoord height = kidFrame->GetSize().height + cellSpacingY;
aReflowState.y += height;
if (NS_UNCONSTRAINEDSIZE != aReflowState.availSize.height) {
aReflowState.availSize.height -= height;
}
}
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, kidFrame);
}
if (haveRow)
aReflowState.y -= cellSpacingY;
// Return our desired rect
aDesiredSize.width = aReflowState.reflowState.availableWidth;
aDesiredSize.height = aReflowState.y;
if (aReflowState.reflowState.mFlags.mSpecialHeightReflow) {
DidResizeRows(aDesiredSize);
if (isPaginated) {
CacheRowHeightsForPrinting(aPresContext, GetFirstRow());
}
}
else if (needToCalcRowHeights) {
CalculateRowHeights(aPresContext, aDesiredSize, aReflowState.reflowState);
if (!reflowAllKids) {
// Because we don't know what changed repaint everything.
// XXX We should change CalculateRowHeights() to return the bounding
// rect of what changed. Or whether anything moved or changed size...
nsRect dirtyRect(0, 0, mRect.width, mRect.height);
Invalidate(dirtyRect);
}
}
return rv;
}
nsTableRowFrame*
nsTableRowGroupFrame::GetFirstRow()
{
for (nsIFrame* childFrame = mFrames.FirstChild(); childFrame;
childFrame = childFrame->GetNextSibling()) {
nsTableRowFrame *rowFrame = do_QueryFrame(childFrame);
if (rowFrame) {
return rowFrame;
}
}
return nsnull;
}
struct RowInfo {
RowInfo() { height = pctHeight = hasStyleHeight = hasPctHeight = isSpecial = 0; }
unsigned height; // content height or fixed height, excluding pct height
unsigned pctHeight:29; // pct height
unsigned hasStyleHeight:1;
unsigned hasPctHeight:1;
unsigned isSpecial:1; // there is no cell originating in the row with rowspan=1 and there are at
// least 2 cells spanning the row and there is no style height on the row
};
static void
UpdateHeights(RowInfo& aRowInfo,
nscoord aAdditionalHeight,
nscoord& aTotal,
nscoord& aUnconstrainedTotal)
{
aRowInfo.height += aAdditionalHeight;
aTotal += aAdditionalHeight;
if (!aRowInfo.hasStyleHeight) {
aUnconstrainedTotal += aAdditionalHeight;
}
}
void
nsTableRowGroupFrame::DidResizeRows(nsHTMLReflowMetrics& aDesiredSize)
{
// update the cells spanning rows with their new heights
// this is the place where all of the cells in the row get set to the height of the row
// Reset the overflow area
aDesiredSize.mOverflowAreas.Clear();
for (nsTableRowFrame* rowFrame = GetFirstRow();
rowFrame; rowFrame = rowFrame->GetNextRow()) {
rowFrame->DidResize();
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, rowFrame);
}
}
// This calculates the height of all the rows and takes into account
// style height on the row group, style heights on rows and cells, style heights on rowspans.
// Actual row heights will be adjusted later if the table has a style height.
// Even if rows don't change height, this method must be called to set the heights of each
// cell in the row to the height of its row.
void
nsTableRowGroupFrame::CalculateRowHeights(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState)
{
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
const bool isPaginated = aPresContext->IsPaginated();
// all table cells have the same top and bottom margins, namely cellSpacingY
nscoord cellSpacingY = tableFrame->GetCellSpacingY();
PRInt32 numEffCols = tableFrame->GetEffectiveColCount();
PRInt32 startRowIndex = GetStartRowIndex();
// find the row corresponding to the row index we just found
nsTableRowFrame* startRowFrame = GetFirstRow();
if (!startRowFrame) return;
// the current row group height is the y origin of the 1st row we are about to calculated a height for
nscoord startRowGroupHeight = startRowFrame->GetPosition().y;
PRInt32 numRows = GetRowCount() - (startRowFrame->GetRowIndex() - GetStartRowIndex());
// collect the current height of each row. nscoord* rowHeights = nsnull;
if (numRows <= 0)
return;
nsTArray<RowInfo> rowInfo;
if (!rowInfo.AppendElements(numRows)) {
return;
}
bool hasRowSpanningCell = false;
nscoord heightOfRows = 0;
nscoord heightOfUnStyledRows = 0;
// Get the height of each row without considering rowspans. This will be the max of
// the largest desired height of each cell, the largest style height of each cell,
// the style height of the row.
nscoord pctHeightBasis = GetHeightBasis(aReflowState);
PRInt32 rowIndex; // the index in rowInfo, not among the rows in the row group
nsTableRowFrame* rowFrame;
for (rowFrame = startRowFrame, rowIndex = 0; rowFrame; rowFrame = rowFrame->GetNextRow(), rowIndex++) {
nscoord nonPctHeight = rowFrame->GetContentHeight();
if (isPaginated) {
nonPctHeight = NS_MAX(nonPctHeight, rowFrame->GetSize().height);
}
if (!rowFrame->GetPrevInFlow()) {
if (rowFrame->HasPctHeight()) {
rowInfo[rowIndex].hasPctHeight = true;
rowInfo[rowIndex].pctHeight = rowFrame->GetHeight(pctHeightBasis);
}
rowInfo[rowIndex].hasStyleHeight = rowFrame->HasStyleHeight();
nonPctHeight = NS_MAX(nonPctHeight, rowFrame->GetFixedHeight());
}
UpdateHeights(rowInfo[rowIndex], nonPctHeight, heightOfRows, heightOfUnStyledRows);
if (!rowInfo[rowIndex].hasStyleHeight) {
if (isPaginated || tableFrame->HasMoreThanOneCell(rowIndex + startRowIndex)) {
rowInfo[rowIndex].isSpecial = true;
// iteratate the row's cell frames to see if any do not have rowspan > 1
nsTableCellFrame* cellFrame = rowFrame->GetFirstCell();
while (cellFrame) {
PRInt32 rowSpan = tableFrame->GetEffectiveRowSpan(rowIndex + startRowIndex, *cellFrame);
if (1 == rowSpan) {
rowInfo[rowIndex].isSpecial = false;
break;
}
cellFrame = cellFrame->GetNextCell();
}
}
}
// See if a cell spans into the row. If so we'll have to do the next step
if (!hasRowSpanningCell) {
if (tableFrame->RowIsSpannedInto(rowIndex + startRowIndex, numEffCols)) {
hasRowSpanningCell = true;
}
}
}
if (hasRowSpanningCell) {
// Get the height of cells with rowspans and allocate any extra space to the rows they span
// iteratate the child frames and process the row frames among them
for (rowFrame = startRowFrame, rowIndex = 0; rowFrame; rowFrame = rowFrame->GetNextRow(), rowIndex++) {
// See if the row has an originating cell with rowspan > 1. We cannot determine this for a row in a
// continued row group by calling RowHasSpanningCells, because the row's fif may not have any originating
// cells yet the row may have a continued cell which originates in it.
if (GetPrevInFlow() || tableFrame->RowHasSpanningCells(startRowIndex + rowIndex, numEffCols)) {
nsTableCellFrame* cellFrame = rowFrame->GetFirstCell();
// iteratate the row's cell frames
while (cellFrame) {
PRInt32 rowSpan = tableFrame->GetEffectiveRowSpan(rowIndex + startRowIndex, *cellFrame);
if ((rowIndex + rowSpan) > numRows) {
// there might be rows pushed already to the nextInFlow
rowSpan = numRows - rowIndex;
}
if (rowSpan > 1) { // a cell with rowspan > 1, determine the height of the rows it spans
nscoord heightOfRowsSpanned = 0;
nscoord heightOfUnStyledRowsSpanned = 0;
nscoord numSpecialRowsSpanned = 0;
nscoord cellSpacingTotal = 0;
PRInt32 spanX;
for (spanX = 0; spanX < rowSpan; spanX++) {
heightOfRowsSpanned += rowInfo[rowIndex + spanX].height;
if (!rowInfo[rowIndex + spanX].hasStyleHeight) {
heightOfUnStyledRowsSpanned += rowInfo[rowIndex + spanX].height;
}
if (0 != spanX) {
cellSpacingTotal += cellSpacingY;
}
if (rowInfo[rowIndex + spanX].isSpecial) {
numSpecialRowsSpanned++;
}
}
nscoord heightOfAreaSpanned = heightOfRowsSpanned + cellSpacingTotal;
// get the height of the cell
nsSize cellFrameSize = cellFrame->GetSize();
nsSize cellDesSize = cellFrame->GetDesiredSize();
rowFrame->CalculateCellActualHeight(cellFrame, cellDesSize.height);
cellFrameSize.height = cellDesSize.height;
if (cellFrame->HasVerticalAlignBaseline()) {
// to ensure that a spanning cell with a long descender doesn't
// collide with the next row, we need to take into account the shift
// that will be done to align the cell on the baseline of the row.
cellFrameSize.height += rowFrame->GetMaxCellAscent() -
cellFrame->GetCellBaseline();
}
if (heightOfAreaSpanned < cellFrameSize.height) {
// the cell's height is larger than the available space of the rows it
// spans so distribute the excess height to the rows affected
nscoord extra = cellFrameSize.height - heightOfAreaSpanned;
nscoord extraUsed = 0;
if (0 == numSpecialRowsSpanned) {
//NS_ASSERTION(heightOfRowsSpanned > 0, "invalid row span situation");
bool haveUnStyledRowsSpanned = (heightOfUnStyledRowsSpanned > 0);
nscoord divisor = (haveUnStyledRowsSpanned)
? heightOfUnStyledRowsSpanned : heightOfRowsSpanned;
if (divisor > 0) {
for (spanX = rowSpan - 1; spanX >= 0; spanX--) {
if (!haveUnStyledRowsSpanned || !rowInfo[rowIndex + spanX].hasStyleHeight) {
// The amount of additional space each row gets is proportional to its height
float percent = ((float)rowInfo[rowIndex + spanX].height) / ((float)divisor);
// give rows their percentage, except for the first row which gets the remainder
nscoord extraForRow = (0 == spanX) ? extra - extraUsed
: NSToCoordRound(((float)(extra)) * percent);
extraForRow = NS_MIN(extraForRow, extra - extraUsed);
// update the row height
UpdateHeights(rowInfo[rowIndex + spanX], extraForRow, heightOfRows, heightOfUnStyledRows);
extraUsed += extraForRow;
if (extraUsed >= extra) {
NS_ASSERTION((extraUsed == extra), "invalid row height calculation");
break;
}
}
}
}
else {
// put everything in the last row
UpdateHeights(rowInfo[rowIndex + rowSpan - 1], extra, heightOfRows, heightOfUnStyledRows);
}
}
else {
// give the extra to the special rows
nscoord numSpecialRowsAllocated = 0;
for (spanX = rowSpan - 1; spanX >= 0; spanX--) {
if (rowInfo[rowIndex + spanX].isSpecial) {
// The amount of additional space each degenerate row gets is proportional to the number of them
float percent = 1.0f / ((float)numSpecialRowsSpanned);
// give rows their percentage, except for the first row which gets the remainder
nscoord extraForRow = (numSpecialRowsSpanned - 1 == numSpecialRowsAllocated)
? extra - extraUsed
: NSToCoordRound(((float)(extra)) * percent);
extraForRow = NS_MIN(extraForRow, extra - extraUsed);
// update the row height
UpdateHeights(rowInfo[rowIndex + spanX], extraForRow, heightOfRows, heightOfUnStyledRows);
extraUsed += extraForRow;
if (extraUsed >= extra) {
NS_ASSERTION((extraUsed == extra), "invalid row height calculation");
break;
}
}
}
}
}
} // if (rowSpan > 1)
cellFrame = cellFrame->GetNextCell();
} // while (cellFrame)
} // if (tableFrame->RowHasSpanningCells(startRowIndex + rowIndex) {
} // while (rowFrame)
}
// pct height rows have already got their content heights. Give them their pct heights up to pctHeightBasis
nscoord extra = pctHeightBasis - heightOfRows;
for (rowFrame = startRowFrame, rowIndex = 0; rowFrame && (extra > 0); rowFrame = rowFrame->GetNextRow(), rowIndex++) {
RowInfo& rInfo = rowInfo[rowIndex];
if (rInfo.hasPctHeight) {
nscoord rowExtra = (rInfo.pctHeight > rInfo.height)
? rInfo.pctHeight - rInfo.height: 0;
rowExtra = NS_MIN(rowExtra, extra);
UpdateHeights(rInfo, rowExtra, heightOfRows, heightOfUnStyledRows);
extra -= rowExtra;
}
}
bool styleHeightAllocation = false;
nscoord rowGroupHeight = startRowGroupHeight + heightOfRows + ((numRows - 1) * cellSpacingY);
// if we have a style height, allocate the extra height to unconstrained rows
if ((aReflowState.ComputedHeight() > rowGroupHeight) &&
(NS_UNCONSTRAINEDSIZE != aReflowState.ComputedHeight())) {
nscoord extraComputedHeight = aReflowState.ComputedHeight() - rowGroupHeight;
nscoord extraUsed = 0;
bool haveUnStyledRows = (heightOfUnStyledRows > 0);
nscoord divisor = (haveUnStyledRows)
? heightOfUnStyledRows : heightOfRows;
if (divisor > 0) {
styleHeightAllocation = true;
for (rowIndex = 0; rowIndex < numRows; rowIndex++) {
if (!haveUnStyledRows || !rowInfo[rowIndex].hasStyleHeight) {
// The amount of additional space each row gets is based on the
// percentage of space it occupies
float percent = ((float)rowInfo[rowIndex].height) / ((float)divisor);
// give rows their percentage, except for the last row which gets the remainder
nscoord extraForRow = (numRows - 1 == rowIndex)
? extraComputedHeight - extraUsed
: NSToCoordRound(((float)extraComputedHeight) * percent);
extraForRow = NS_MIN(extraForRow, extraComputedHeight - extraUsed);
// update the row height
UpdateHeights(rowInfo[rowIndex], extraForRow, heightOfRows, heightOfUnStyledRows);
extraUsed += extraForRow;
if (extraUsed >= extraComputedHeight) {
NS_ASSERTION((extraUsed == extraComputedHeight), "invalid row height calculation");
break;
}
}
}
}
rowGroupHeight = aReflowState.ComputedHeight();
}
nscoord yOrigin = startRowGroupHeight;
// update the rows with their (potentially) new heights
for (rowFrame = startRowFrame, rowIndex = 0; rowFrame; rowFrame = rowFrame->GetNextRow(), rowIndex++) {
nsRect rowBounds = rowFrame->GetRect();
nsRect rowVisualOverflow = rowFrame->GetVisualOverflowRect();
bool movedFrame = (rowBounds.y != yOrigin);
nscoord rowHeight = (rowInfo[rowIndex].height > 0) ? rowInfo[rowIndex].height : 0;
if (movedFrame || (rowHeight != rowBounds.height)) {
// Resize/move the row to its final size and position
if (movedFrame) {
rowFrame->InvalidateFrameSubtree();
}
rowFrame->SetRect(nsRect(rowBounds.x, yOrigin, rowBounds.width,
rowHeight));
nsTableFrame::InvalidateFrame(rowFrame, rowBounds, rowVisualOverflow,
false);
}
if (movedFrame) {
nsTableFrame::RePositionViews(rowFrame);
// XXXbz we don't need to update our overflow area?
}
yOrigin += rowHeight + cellSpacingY;
}
if (isPaginated && styleHeightAllocation) {
// since the row group has a style height, cache the row heights, so next in flows can honor them
CacheRowHeightsForPrinting(aPresContext, GetFirstRow());
}
DidResizeRows(aDesiredSize);
aDesiredSize.height = rowGroupHeight; // Adjust our desired size
}
nscoord
nsTableRowGroupFrame::CollapseRowGroupIfNecessary(nscoord aYTotalOffset,
nscoord aWidth)
{
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
const nsStyleVisibility* groupVis = GetStyleVisibility();
bool collapseGroup = (NS_STYLE_VISIBILITY_COLLAPSE == groupVis->mVisible);
if (collapseGroup) {
tableFrame->SetNeedToCollapse(true);
}
nsOverflowAreas overflow;
nsTableRowFrame* rowFrame= GetFirstRow();
bool didCollapse = false;
nscoord yGroupOffset = 0;
while (rowFrame) {
yGroupOffset += rowFrame->CollapseRowIfNecessary(yGroupOffset,
aWidth, collapseGroup,
didCollapse);
ConsiderChildOverflow(overflow, rowFrame);
rowFrame = rowFrame->GetNextRow();
}
nsRect groupRect = GetRect();
nsRect oldGroupRect = groupRect;
nsRect oldGroupVisualOverflow = GetVisualOverflowRect();
groupRect.height -= yGroupOffset;
if (didCollapse) {
// add back the cellspacing between rowgroups
groupRect.height += tableFrame->GetCellSpacingY();
}
groupRect.y -= aYTotalOffset;
groupRect.width = aWidth;
if (aYTotalOffset != 0) {
InvalidateFrameSubtree();
}
SetRect(groupRect);
overflow.UnionAllWith(nsRect(0, 0, groupRect.width, groupRect.height));
FinishAndStoreOverflow(overflow, nsSize(groupRect.width, groupRect.height));
nsTableFrame::RePositionViews(this);
nsTableFrame::InvalidateFrame(this, oldGroupRect, oldGroupVisualOverflow,
false);
return yGroupOffset;
}
// Move a child that was skipped during a reflow.
void
nsTableRowGroupFrame::SlideChild(nsRowGroupReflowState& aReflowState,
nsIFrame* aKidFrame)
{
// Move the frame if we need to
nsPoint oldPosition = aKidFrame->GetPosition();
nsPoint newPosition = oldPosition;
newPosition.y = aReflowState.y;
if (oldPosition.y != newPosition.y) {
aKidFrame->InvalidateFrameSubtree();
aKidFrame->SetPosition(newPosition);
nsTableFrame::RePositionViews(aKidFrame);
aKidFrame->InvalidateFrameSubtree();
}
}
// Create a continuing frame, add it to the child list, and then push it
// and the frames that follow
void
nsTableRowGroupFrame::CreateContinuingRowFrame(nsPresContext& aPresContext,
nsIFrame& aRowFrame,
nsIFrame** aContRowFrame)
{
// XXX what is the row index?
if (!aContRowFrame) {NS_ASSERTION(false, "bad call"); return;}
// create the continuing frame which will create continuing cell frames
nsresult rv = aPresContext.PresShell()->FrameConstructor()->
CreateContinuingFrame(&aPresContext, &aRowFrame, this, aContRowFrame);
if (NS_FAILED(rv)) {
*aContRowFrame = nsnull;
return;
}
// Add the continuing row frame to the child list
mFrames.InsertFrame(nsnull, &aRowFrame, *aContRowFrame);
// Push the continuing row frame and the frames that follow
PushChildren(&aPresContext, *aContRowFrame, &aRowFrame);
}
// Reflow the cells with rowspan > 1 which originate between aFirstRow
// and end on or after aLastRow. aFirstTruncatedRow is the highest row on the
// page that contains a cell which cannot split on this page
void
nsTableRowGroupFrame::SplitSpanningCells(nsPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nsTableFrame& aTable,
nsTableRowFrame& aFirstRow,
nsTableRowFrame& aLastRow,
bool aFirstRowIsTopOfPage,
nscoord aSpanningRowBottom,
nsTableRowFrame*& aContRow,
nsTableRowFrame*& aFirstTruncatedRow,
nscoord& aDesiredHeight)
{
NS_ASSERTION(aSpanningRowBottom >= 0, "Can't split negative heights");
aFirstTruncatedRow = nsnull;
aDesiredHeight = 0;
const bool borderCollapse = aTable.IsBorderCollapse();
PRInt32 lastRowIndex = aLastRow.GetRowIndex();
bool wasLast = false;
bool haveRowSpan = false;
// Iterate the rows between aFirstRow and aLastRow
for (nsTableRowFrame* row = &aFirstRow; !wasLast; row = row->GetNextRow()) {
wasLast = (row == &aLastRow);
PRInt32 rowIndex = row->GetRowIndex();
nsPoint rowPos = row->GetPosition();
// Iterate the cells looking for those that have rowspan > 1
for (nsTableCellFrame* cell = row->GetFirstCell(); cell; cell = cell->GetNextCell()) {
PRInt32 rowSpan = aTable.GetEffectiveRowSpan(rowIndex, *cell);
// Only reflow rowspan > 1 cells which span aLastRow. Those which don't span aLastRow
// were reflowed correctly during the unconstrained height reflow.
if ((rowSpan > 1) && (rowIndex + rowSpan > lastRowIndex)) {
haveRowSpan = true;
nsReflowStatus status;
// Ask the row to reflow the cell to the height of all the rows it spans up through aLastRow
// aAvailHeight is the space between the row group start and the end of the page
nscoord cellAvailHeight = aSpanningRowBottom - rowPos.y;
NS_ASSERTION(cellAvailHeight >= 0, "No space for cell?");
bool isTopOfPage = (row == &aFirstRow) && aFirstRowIsTopOfPage;
nsRect rowRect = row->GetRect();
nsSize rowAvailSize(aReflowState.availableWidth,
NS_MAX(aReflowState.availableHeight - rowRect.y,
0));
// don't let the available height exceed what
// CalculateRowHeights set for it
rowAvailSize.height = NS_MIN(rowAvailSize.height, rowRect.height);
nsHTMLReflowState rowReflowState(&aPresContext, aReflowState,
row, rowAvailSize,
-1, -1, false);
InitChildReflowState(aPresContext, borderCollapse, rowReflowState);
rowReflowState.mFlags.mIsTopOfPage = isTopOfPage; // set top of page
nscoord cellHeight = row->ReflowCellFrame(&aPresContext, rowReflowState,
isTopOfPage, cell,
cellAvailHeight, status);
aDesiredHeight = NS_MAX(aDesiredHeight, rowPos.y + cellHeight);
if (NS_FRAME_IS_COMPLETE(status)) {
if (cellHeight > cellAvailHeight) {
aFirstTruncatedRow = row;
if ((row != &aFirstRow) || !aFirstRowIsTopOfPage) {
// return now, since we will be getting another reflow after either (1) row is
// moved to the next page or (2) the row group is moved to the next page
return;
}
}
}
else {
if (!aContRow) {
CreateContinuingRowFrame(aPresContext, aLastRow, (nsIFrame**)&aContRow);
}
if (aContRow) {
if (row != &aLastRow) {
// aContRow needs a continuation for cell, since cell spanned into aLastRow
// but does not originate there
nsTableCellFrame* contCell = nsnull;
aPresContext.PresShell()->FrameConstructor()->
CreateContinuingFrame(&aPresContext, cell, &aLastRow,
(nsIFrame**)&contCell);
PRInt32 colIndex;
cell->GetColIndex(colIndex);
aContRow->InsertCellFrame(contCell, colIndex);
}
}
}
}
}
}
if (!haveRowSpan) {
aDesiredHeight = aLastRow.GetRect().YMost();
}
}
// Remove the next-in-flow of the row, its cells and their cell blocks. This
// is necessary in case the row doesn't need a continuation later on or needs
// a continuation which doesn't have the same number of cells that now exist.
void
nsTableRowGroupFrame::UndoContinuedRow(nsPresContext* aPresContext,
nsTableRowFrame* aRow)
{
if (!aRow) return; // allow null aRow to avoid callers doing null checks
// rowBefore was the prev-sibling of aRow's next-sibling before aRow was created
nsTableRowFrame* rowBefore = (nsTableRowFrame*)aRow->GetPrevInFlow();
NS_PRECONDITION(mFrames.ContainsFrame(rowBefore),
"rowBefore not in our frame list?");
nsAutoPtr<nsFrameList> overflows(StealOverflowFrames());
if (!rowBefore || !overflows || overflows->IsEmpty() ||
overflows->FirstChild() != aRow) {
NS_ERROR("invalid continued row");
return;
}
// Destroy aRow, its cells, and their cell blocks. Cell blocks that have split
// will not have reflowed yet to pick up content from any overflow lines.
overflows->DestroyFrame(aRow);
if (overflows->IsEmpty())
return;
// Put the overflow rows into our child list
mFrames.InsertFrames(nsnull, rowBefore, *overflows);
}
static nsTableRowFrame*
GetRowBefore(nsTableRowFrame& aStartRow,
nsTableRowFrame& aRow)
{
nsTableRowFrame* rowBefore = nsnull;
for (nsTableRowFrame* sib = &aStartRow; sib && (sib != &aRow); sib = sib->GetNextRow()) {
rowBefore = sib;
}
return rowBefore;
}
nsresult
nsTableRowGroupFrame::SplitRowGroup(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsTableFrame* aTableFrame,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aPresContext->IsPaginated(), "SplitRowGroup currently supports only paged media");
nsresult rv = NS_OK;
nsTableRowFrame* prevRowFrame = nsnull;
aDesiredSize.height = 0;
nscoord availWidth = aReflowState.availableWidth;
nscoord availHeight = aReflowState.availableHeight;
const bool borderCollapse = aTableFrame->IsBorderCollapse();
nscoord cellSpacingY = aTableFrame->GetCellSpacingY();
// get the page height
nscoord pageHeight = aPresContext->GetPageSize().height;
NS_ASSERTION(pageHeight != NS_UNCONSTRAINEDSIZE,
"The table shouldn't be split when there should be space");
bool isTopOfPage = aReflowState.mFlags.mIsTopOfPage;
nsTableRowFrame* firstRowThisPage = GetFirstRow();
// Need to dirty the table's geometry, or else the row might skip
// reflowing its cell as an optimization.
aTableFrame->SetGeometryDirty();
// Walk each of the row frames looking for the first row frame that doesn't fit
// in the available space
for (nsTableRowFrame* rowFrame = firstRowThisPage; rowFrame; rowFrame = rowFrame->GetNextRow()) {
bool rowIsOnPage = true;
nsRect rowRect = rowFrame->GetRect();
// See if the row fits on this page
if (rowRect.YMost() > availHeight) {
nsTableRowFrame* contRow = nsnull;
// Reflow the row in the availabe space and have it split if it is the 1st
// row (on the page) or there is at least 5% of the current page available
// XXX this 5% should be made a preference
if (!prevRowFrame || (availHeight - aDesiredSize.height > pageHeight / 20)) {
nsSize availSize(availWidth, NS_MAX(availHeight - rowRect.y, 0));
// don't let the available height exceed what CalculateRowHeights set for it
availSize.height = NS_MIN(availSize.height, rowRect.height);
nsHTMLReflowState rowReflowState(aPresContext, aReflowState,
rowFrame, availSize,
-1, -1, false);
InitChildReflowState(*aPresContext, borderCollapse, rowReflowState);
rowReflowState.mFlags.mIsTopOfPage = isTopOfPage; // set top of page
nsHTMLReflowMetrics rowMetrics;
// Get the old size before we reflow.
nsRect oldRowRect = rowFrame->GetRect();
nsRect oldRowVisualOverflow = rowFrame->GetVisualOverflowRect();
// Reflow the cell with the constrained height. A cell with rowspan >1 will get this
// reflow later during SplitSpanningCells.
rv = ReflowChild(rowFrame, aPresContext, rowMetrics, rowReflowState,
0, 0, NS_FRAME_NO_MOVE_FRAME, aStatus);
if (NS_FAILED(rv)) return rv;
rowFrame->SetSize(nsSize(rowMetrics.width, rowMetrics.height));
rowFrame->DidReflow(aPresContext, nsnull, NS_FRAME_REFLOW_FINISHED);
rowFrame->DidResize();
nsTableFrame::InvalidateFrame(rowFrame, oldRowRect,
oldRowVisualOverflow,
false);
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
// The row frame is incomplete and all of the rowspan 1 cells' block frames split
if ((rowMetrics.height <= rowReflowState.availableHeight) || isTopOfPage) {
// The row stays on this page because either it split ok or we're on the top of page.
// If top of page and the height exceeded the avail height, then there will be data loss
NS_ASSERTION(rowMetrics.height <= rowReflowState.availableHeight,
"data loss - incomplete row needed more height than available, on top of page");
CreateContinuingRowFrame(*aPresContext, *rowFrame, (nsIFrame**)&contRow);
if (contRow) {
aDesiredSize.height += rowMetrics.height;
if (prevRowFrame)
aDesiredSize.height += cellSpacingY;
}
else return NS_ERROR_NULL_POINTER;
}
else {
// Put the row on the next page to give it more height
rowIsOnPage = false;
}
}
else {
// The row frame is complete because either (1) its minimum height is greater than the
// available height we gave it, or (2) it may have been given a larger height through
// style than its content, or (3) it contains a rowspan >1 cell which hasn't been
// reflowed with a constrained height yet (we will find out when SplitSpanningCells is
// called below)
if (rowMetrics.height > availSize.height) {
// cases (1) and (2)
if (isTopOfPage) {
// We're on top of the page, so keep the row on this page. There will be data loss.
// Push the row frame that follows
nsTableRowFrame* nextRowFrame = rowFrame->GetNextRow();
if (nextRowFrame) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
aDesiredSize.height += rowMetrics.height;
if (prevRowFrame)
aDesiredSize.height += cellSpacingY;
NS_WARNING("data loss - complete row needed more height than available, on top of page");
}
else {
// We're not on top of the page, so put the row on the next page to give it more height
rowIsOnPage = false;
}
}
}
} //if (!prevRowFrame || (availHeight - aDesiredSize.height > pageHeight / 20))
else {
// put the row on the next page to give it more height
rowIsOnPage = false;
}
nsTableRowFrame* lastRowThisPage = rowFrame;
nscoord spanningRowBottom = availHeight;
if (!rowIsOnPage) {
NS_ASSERTION(!contRow, "We should not have created a continuation if none of this row fits");
if (prevRowFrame) {
spanningRowBottom = prevRowFrame->GetRect().YMost();
lastRowThisPage = prevRowFrame;
isTopOfPage = (lastRowThisPage == firstRowThisPage) && aReflowState.mFlags.mIsTopOfPage;
aStatus = NS_FRAME_NOT_COMPLETE;
}
else {
// We can't push children, so let our parent reflow us again with more space
aDesiredSize.height = rowRect.YMost();
aStatus = NS_FRAME_COMPLETE;
break;
}
}
// reflow the cells with rowspan >1 that occur on the page
nsTableRowFrame* firstTruncatedRow;
nscoord yMost;
SplitSpanningCells(*aPresContext, aReflowState, *aTableFrame, *firstRowThisPage,
*lastRowThisPage, aReflowState.mFlags.mIsTopOfPage, spanningRowBottom, contRow,
firstTruncatedRow, yMost);
if (firstTruncatedRow) {
// A rowspan >1 cell did not fit (and could not split) in the space we gave it
if (firstTruncatedRow == firstRowThisPage) {
if (aReflowState.mFlags.mIsTopOfPage) {
NS_WARNING("data loss in a row spanned cell");
}
else {
// We can't push children, so let our parent reflow us again with more space
aDesiredSize.height = rowRect.YMost();
aStatus = NS_FRAME_COMPLETE;
UndoContinuedRow(aPresContext, contRow);
contRow = nsnull;
}
}
else { // (firstTruncatedRow != firstRowThisPage)
// Try to put firstTruncateRow on the next page
nsTableRowFrame* rowBefore = ::GetRowBefore(*firstRowThisPage, *firstTruncatedRow);
nscoord oldSpanningRowBottom = spanningRowBottom;
spanningRowBottom = rowBefore->GetRect().YMost();
UndoContinuedRow(aPresContext, contRow);
contRow = nsnull;
nsTableRowFrame* oldLastRowThisPage = lastRowThisPage;
lastRowThisPage = rowBefore;
aStatus = NS_FRAME_NOT_COMPLETE;
// Call SplitSpanningCells again with rowBefore as the last row on the page
SplitSpanningCells(*aPresContext, aReflowState, *aTableFrame,
*firstRowThisPage, *rowBefore, aReflowState.mFlags.mIsTopOfPage,
spanningRowBottom, contRow, firstTruncatedRow, aDesiredSize.height);
if (firstTruncatedRow) {
if (aReflowState.mFlags.mIsTopOfPage) {
// We were better off with the 1st call to SplitSpanningCells, do it again
UndoContinuedRow(aPresContext, contRow);
contRow = nsnull;
lastRowThisPage = oldLastRowThisPage;
spanningRowBottom = oldSpanningRowBottom;
SplitSpanningCells(*aPresContext, aReflowState, *aTableFrame, *firstRowThisPage,
*lastRowThisPage, aReflowState.mFlags.mIsTopOfPage, spanningRowBottom, contRow,
firstTruncatedRow, aDesiredSize.height);
NS_WARNING("data loss in a row spanned cell");
}
else {
// Let our parent reflow us again with more space
aDesiredSize.height = rowRect.YMost();
aStatus = NS_FRAME_COMPLETE;
UndoContinuedRow(aPresContext, contRow);
contRow = nsnull;
}
}
} // if (firstTruncatedRow == firstRowThisPage)
} // if (firstTruncatedRow)
else {
aDesiredSize.height = NS_MAX(aDesiredSize.height, yMost);
if (contRow) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
}
if (NS_FRAME_IS_NOT_COMPLETE(aStatus) && !contRow) {
nsTableRowFrame* nextRow = lastRowThisPage->GetNextRow();
if (nextRow) {
PushChildren(aPresContext, nextRow, lastRowThisPage);
}
}
break;
} // if (rowRect.YMost() > availHeight)
else {
aDesiredSize.height = rowRect.YMost();
prevRowFrame = rowFrame;
// see if there is a page break after the row
nsTableRowFrame* nextRow = rowFrame->GetNextRow();
if (nextRow && nsTableFrame::PageBreakAfter(rowFrame, nextRow)) {
PushChildren(aPresContext, nextRow, rowFrame);
aStatus = NS_FRAME_NOT_COMPLETE;
break;
}
}
// after the 1st row that has a height, we can't be on top
// of the page anymore.
isTopOfPage = isTopOfPage && rowRect.YMost() == 0;
}
return NS_OK;
}
/** Layout the entire row group.
* This method stacks rows vertically according to HTML 4.0 rules.
* Rows are responsible for layout of their children.
*/
NS_METHOD
nsTableRowGroupFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsTableRowGroupFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
nsresult rv = NS_OK;
aStatus = NS_FRAME_COMPLETE;
// Row geometry may be going to change so we need to invalidate any row cursor.
ClearRowCursor();
// see if a special height reflow needs to occur due to having a pct height
nsTableFrame::CheckRequestSpecialHeightReflow(aReflowState);
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
nsRowGroupReflowState state(aReflowState, tableFrame);
const nsStyleVisibility* groupVis = GetStyleVisibility();
bool collapseGroup = (NS_STYLE_VISIBILITY_COLLAPSE == groupVis->mVisible);
if (collapseGroup) {
tableFrame->SetNeedToCollapse(true);
}
// Check for an overflow list
MoveOverflowToChildList(aPresContext);
// Reflow the existing frames.
bool splitDueToPageBreak = false;
rv = ReflowChildren(aPresContext, aDesiredSize, state, aStatus,
&splitDueToPageBreak);
// See if all the frames fit. Do not try to split anything if we're
// not paginated ... we can't split across columns yet.
if (aReflowState.mFlags.mTableIsSplittable &&
NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight &&
(NS_FRAME_NOT_COMPLETE == aStatus || splitDueToPageBreak ||
aDesiredSize.height > aReflowState.availableHeight)) {
// Nope, find a place to split the row group
bool specialReflow = (bool)aReflowState.mFlags.mSpecialHeightReflow;
((nsHTMLReflowState::ReflowStateFlags&)aReflowState.mFlags).mSpecialHeightReflow = false;
SplitRowGroup(aPresContext, aDesiredSize, aReflowState, tableFrame, aStatus);
((nsHTMLReflowState::ReflowStateFlags&)aReflowState.mFlags).mSpecialHeightReflow = specialReflow;
}
// If we have a next-in-flow, then we're not complete
// XXXldb This used to be done only for the incremental reflow codepath.
if (GetNextInFlow()) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
SetHasStyleHeight((NS_UNCONSTRAINEDSIZE != aReflowState.ComputedHeight()) &&
(aReflowState.ComputedHeight() > 0));
// just set our width to what was available. The table will calculate the width and not use our value.
aDesiredSize.width = aReflowState.availableWidth;
aDesiredSize.UnionOverflowAreasWithDesiredBounds();
// If our parent is in initial reflow, it'll handle invalidating our
// entire overflow rect.
if (!(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
CheckInvalidateSizeChange(aDesiredSize);
}
FinishAndStoreOverflow(&aDesiredSize);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return rv;
}
/* virtual */ void
nsTableRowGroupFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
{
if (!aOldStyleContext) //avoid this on init
return;
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
if (tableFrame->IsBorderCollapse() &&
tableFrame->BCRecalcNeeded(aOldStyleContext, GetStyleContext())) {
nsIntRect damageArea(0, GetStartRowIndex(), tableFrame->GetColCount(),
GetRowCount());
tableFrame->AddBCDamageArea(damageArea);
}
}
NS_IMETHODIMP
nsTableRowGroupFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");
ClearRowCursor();
// collect the new row frames in an array
// XXXbz why are we doing the QI stuff? There shouldn't be any non-rows here.
nsAutoTArray<nsTableRowFrame*, 8> rows;
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
nsTableRowFrame *rowFrame = do_QueryFrame(e.get());
NS_ASSERTION(rowFrame, "Unexpected frame; frame constructor screwed up");
if (rowFrame) {
NS_ASSERTION(NS_STYLE_DISPLAY_TABLE_ROW ==
e.get()->GetStyleDisplay()->mDisplay,
"wrong display type on rowframe");
rows.AppendElement(rowFrame);
}
}
PRInt32 rowIndex = GetRowCount();
// Append the frames to the sibling chain
mFrames.AppendFrames(nsnull, aFrameList);
if (rows.Length() > 0) {
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
tableFrame->AppendRows(this, rowIndex, rows);
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
tableFrame->SetGeometryDirty();
}
return NS_OK;
}
NS_IMETHODIMP
nsTableRowGroupFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
ClearRowCursor();
// collect the new row frames in an array
// XXXbz why are we doing the QI stuff? There shouldn't be any non-rows here.
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
nsTArray<nsTableRowFrame*> rows;
bool gotFirstRow = false;
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
nsTableRowFrame *rowFrame = do_QueryFrame(e.get());
NS_ASSERTION(rowFrame, "Unexpected frame; frame constructor screwed up");
if (rowFrame) {
NS_ASSERTION(NS_STYLE_DISPLAY_TABLE_ROW ==
e.get()->GetStyleDisplay()->mDisplay,
"wrong display type on rowframe");
rows.AppendElement(rowFrame);
if (!gotFirstRow) {
rowFrame->SetFirstInserted(true);
gotFirstRow = true;
tableFrame->SetRowInserted(true);
}
}
}
PRInt32 startRowIndex = GetStartRowIndex();
// Insert the frames in the sibling chain
mFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
PRInt32 numRows = rows.Length();
if (numRows > 0) {
nsTableRowFrame* prevRow = (nsTableRowFrame *)nsTableFrame::GetFrameAtOrBefore(this, aPrevFrame, nsGkAtoms::tableRowFrame);
PRInt32 rowIndex = (prevRow) ? prevRow->GetRowIndex() + 1 : startRowIndex;
tableFrame->InsertRows(this, rows, rowIndex, true);
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
tableFrame->SetGeometryDirty();
}
return NS_OK;
}
NS_IMETHODIMP
nsTableRowGroupFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");
ClearRowCursor();
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
// XXX why are we doing the QI stuff? There shouldn't be any non-rows here.
nsTableRowFrame* rowFrame = do_QueryFrame(aOldFrame);
if (rowFrame) {
// remove the rows from the table (and flag a rebalance)
tableFrame->RemoveRows(*rowFrame, 1, true);
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
tableFrame->SetGeometryDirty();
}
mFrames.DestroyFrame(aOldFrame);
return NS_OK;
}
/* virtual */ nsMargin
nsTableRowGroupFrame::GetUsedMargin() const
{
return nsMargin(0,0,0,0);
}
/* virtual */ nsMargin
nsTableRowGroupFrame::GetUsedBorder() const
{
return nsMargin(0,0,0,0);
}
/* virtual */ nsMargin
nsTableRowGroupFrame::GetUsedPadding() const
{
return nsMargin(0,0,0,0);
}
nscoord
nsTableRowGroupFrame::GetHeightBasis(const nsHTMLReflowState& aReflowState)
{
nscoord result = 0;
nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
if ((aReflowState.ComputedHeight() > 0) && (aReflowState.ComputedHeight() < NS_UNCONSTRAINEDSIZE)) {
nscoord cellSpacing = NS_MAX(0, GetRowCount() - 1) * tableFrame->GetCellSpacingY();
result = aReflowState.ComputedHeight() - cellSpacing;
}
else {
const nsHTMLReflowState* parentRS = aReflowState.parentReflowState;
if (parentRS && (tableFrame != parentRS->frame)) {
parentRS = parentRS->parentReflowState;
}
if (parentRS && (tableFrame == parentRS->frame) &&
(parentRS->ComputedHeight() > 0) && (parentRS->ComputedHeight() < NS_UNCONSTRAINEDSIZE)) {
nscoord cellSpacing = NS_MAX(0, tableFrame->GetRowCount() + 1) * tableFrame->GetCellSpacingY();
result = parentRS->ComputedHeight() - cellSpacing;
}
}
return result;
}
bool
nsTableRowGroupFrame::IsSimpleRowFrame(nsTableFrame* aTableFrame,
nsIFrame* aFrame)
{
// Make sure it's a row frame and not a row group frame
nsTableRowFrame *rowFrame = do_QueryFrame(aFrame);
if (rowFrame) {
PRInt32 rowIndex = rowFrame->GetRowIndex();
// It's a simple row frame if there are no cells that span into or
// across the row
PRInt32 numEffCols = aTableFrame->GetEffectiveColCount();
if (!aTableFrame->RowIsSpannedInto(rowIndex, numEffCols) &&
!aTableFrame->RowHasSpanningCells(rowIndex, numEffCols)) {
return true;
}
}
return false;
}
nsIAtom*
nsTableRowGroupFrame::GetType() const
{
return nsGkAtoms::tableRowGroupFrame;
}
/** find page break before the first row **/
bool
nsTableRowGroupFrame::HasInternalBreakBefore() const
{
nsIFrame* firstChild = mFrames.FirstChild();
if (!firstChild)
return false;
return firstChild->GetStyleDisplay()->mBreakBefore;
}
/** find page break after the last row **/
bool
nsTableRowGroupFrame::HasInternalBreakAfter() const
{
nsIFrame* lastChild = mFrames.LastChild();
if (!lastChild)
return false;
return lastChild->GetStyleDisplay()->mBreakAfter;
}
/* ----- global methods ----- */
nsIFrame*
NS_NewTableRowGroupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsTableRowGroupFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsTableRowGroupFrame)
#ifdef DEBUG
NS_IMETHODIMP
nsTableRowGroupFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("TableRowGroup"), aResult);
}
#endif
nsMargin*
nsTableRowGroupFrame::GetBCBorderWidth(nsMargin& aBorder)
{
aBorder.left = aBorder.right = aBorder.top = aBorder.bottom = 0;
nsTableRowFrame* firstRowFrame = nsnull;
nsTableRowFrame* lastRowFrame = nsnull;
for (nsTableRowFrame* rowFrame = GetFirstRow(); rowFrame; rowFrame = rowFrame->GetNextRow()) {
if (!firstRowFrame) {
firstRowFrame = rowFrame;
}
lastRowFrame = rowFrame;
}
if (firstRowFrame) {
aBorder.top = nsPresContext::CSSPixelsToAppUnits(firstRowFrame->GetTopBCBorderWidth());
aBorder.bottom = nsPresContext::CSSPixelsToAppUnits(lastRowFrame->GetBottomBCBorderWidth());
}
return &aBorder;
}
void nsTableRowGroupFrame::SetContinuousBCBorderWidth(PRUint8 aForSide,
BCPixelSize aPixelValue)
{
switch (aForSide) {
case NS_SIDE_RIGHT:
mRightContBorderWidth = aPixelValue;
return;
case NS_SIDE_BOTTOM:
mBottomContBorderWidth = aPixelValue;
return;
case NS_SIDE_LEFT:
mLeftContBorderWidth = aPixelValue;
return;
default:
NS_ERROR("invalid NS_SIDE argument");
}
}
//nsILineIterator methods
PRInt32
nsTableRowGroupFrame::GetNumLines()
{
return GetRowCount();
}
bool
nsTableRowGroupFrame::GetDirection()
{
nsTableFrame* table = nsTableFrame::GetTableFrame(this);
return (NS_STYLE_DIRECTION_RTL ==
table->GetStyleVisibility()->mDirection);
}
NS_IMETHODIMP
nsTableRowGroupFrame::GetLine(PRInt32 aLineNumber,
nsIFrame** aFirstFrameOnLine,
PRInt32* aNumFramesOnLine,
nsRect& aLineBounds,
PRUint32* aLineFlags)
{
NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
NS_ENSURE_ARG_POINTER(aLineFlags);
nsTableFrame* table = nsTableFrame::GetTableFrame(this);
nsTableCellMap* cellMap = table->GetCellMap();
*aLineFlags = 0;
*aFirstFrameOnLine = nsnull;
*aNumFramesOnLine = 0;
aLineBounds.SetRect(0, 0, 0, 0);
if ((aLineNumber < 0) || (aLineNumber >= GetRowCount())) {
return NS_OK;
}
aLineNumber += GetStartRowIndex();
*aNumFramesOnLine = cellMap->GetNumCellsOriginatingInRow(aLineNumber);
if (*aNumFramesOnLine == 0) {
return NS_OK;
}
PRInt32 colCount = table->GetColCount();
for (PRInt32 i = 0; i < colCount; i++) {
CellData* data = cellMap->GetDataAt(aLineNumber, i);
if (data && data->IsOrig()) {
*aFirstFrameOnLine = (nsIFrame*)data->GetCellFrame();
nsIFrame* parent = (*aFirstFrameOnLine)->GetParent();
aLineBounds = parent->GetRect();
return NS_OK;
}
}
NS_ERROR("cellmap is lying");
return NS_ERROR_FAILURE;
}
PRInt32
nsTableRowGroupFrame::FindLineContaining(nsIFrame* aFrame, PRInt32 aStartLine)
{
NS_ENSURE_ARG_POINTER(aFrame);
nsTableRowFrame *rowFrame = do_QueryFrame(aFrame);
NS_ASSERTION(rowFrame, "RowGroup contains a frame that is not a row");
PRInt32 rowIndexInGroup = rowFrame->GetRowIndex() - GetStartRowIndex();
return rowIndexInGroup >= aStartLine ? rowIndexInGroup : -1;
}
#ifdef IBMBIDI
NS_IMETHODIMP
nsTableRowGroupFrame::CheckLineOrder(PRInt32 aLine,
bool *aIsReordered,
nsIFrame **aFirstVisual,
nsIFrame **aLastVisual)
{
*aIsReordered = false;
*aFirstVisual = nsnull;
*aLastVisual = nsnull;
return NS_OK;
}
#endif // IBMBIDI
NS_IMETHODIMP
nsTableRowGroupFrame::FindFrameAt(PRInt32 aLineNumber,
nscoord aX,
nsIFrame** aFrameFound,
bool* aXIsBeforeFirstFrame,
bool* aXIsAfterLastFrame)
{
nsTableFrame* table = nsTableFrame::GetTableFrame(this);
nsTableCellMap* cellMap = table->GetCellMap();
*aFrameFound = nsnull;
*aXIsBeforeFirstFrame = true;
*aXIsAfterLastFrame = false;
aLineNumber += GetStartRowIndex();
PRInt32 numCells = cellMap->GetNumCellsOriginatingInRow(aLineNumber);
if (numCells == 0) {
return NS_OK;
}
nsIFrame* frame = nsnull;
PRInt32 colCount = table->GetColCount();
for (PRInt32 i = 0; i < colCount; i++) {
CellData* data = cellMap->GetDataAt(aLineNumber, i);
if (data && data->IsOrig()) {
frame = (nsIFrame*)data->GetCellFrame();
break;
}
}
NS_ASSERTION(frame, "cellmap is lying");
bool isRTL = (NS_STYLE_DIRECTION_RTL ==
table->GetStyleVisibility()->mDirection);
nsIFrame* closestFromLeft = nsnull;
nsIFrame* closestFromRight = nsnull;
PRInt32 n = numCells;
nsIFrame* firstFrame = frame;
while (n--) {
nsRect rect = frame->GetRect();
if (rect.width > 0) {
// If aX is inside this frame - this is it
if (rect.x <= aX && rect.XMost() > aX) {
closestFromLeft = closestFromRight = frame;
break;
}
if (rect.x < aX) {
if (!closestFromLeft ||
rect.XMost() > closestFromLeft->GetRect().XMost())
closestFromLeft = frame;
}
else {
if (!closestFromRight ||
rect.x < closestFromRight->GetRect().x)
closestFromRight = frame;
}
}
frame = frame->GetNextSibling();
}
if (!closestFromLeft && !closestFromRight) {
// All frames were zero-width. Just take the first one.
closestFromLeft = closestFromRight = firstFrame;
}
*aXIsBeforeFirstFrame = isRTL ? !closestFromRight : !closestFromLeft;
*aXIsAfterLastFrame = isRTL ? !closestFromLeft : !closestFromRight;
if (closestFromLeft == closestFromRight) {
*aFrameFound = closestFromLeft;
}
else if (!closestFromLeft) {
*aFrameFound = closestFromRight;
}
else if (!closestFromRight) {
*aFrameFound = closestFromLeft;
}
else { // we're between two frames
nscoord delta = closestFromRight->GetRect().x -
closestFromLeft->GetRect().XMost();
if (aX < closestFromLeft->GetRect().XMost() + delta/2)
*aFrameFound = closestFromLeft;
else
*aFrameFound = closestFromRight;
}
return NS_OK;
}
NS_IMETHODIMP
nsTableRowGroupFrame::GetNextSiblingOnLine(nsIFrame*& aFrame,
PRInt32 aLineNumber)
{
NS_ENSURE_ARG_POINTER(aFrame);
aFrame = aFrame->GetNextSibling();
return NS_OK;
}
//end nsLineIterator methods
static void
DestroyFrameCursorData(void* aPropertyValue)
{
delete static_cast<nsTableRowGroupFrame::FrameCursorData*>(aPropertyValue);
}
NS_DECLARE_FRAME_PROPERTY(RowCursorProperty, DestroyFrameCursorData)
void
nsTableRowGroupFrame::ClearRowCursor()
{
if (!(GetStateBits() & NS_ROWGROUP_HAS_ROW_CURSOR))
return;
RemoveStateBits(NS_ROWGROUP_HAS_ROW_CURSOR);
Properties().Delete(RowCursorProperty());
}
nsTableRowGroupFrame::FrameCursorData*
nsTableRowGroupFrame::SetupRowCursor()
{
if (GetStateBits() & NS_ROWGROUP_HAS_ROW_CURSOR) {
// We already have a valid row cursor. Don't waste time rebuilding it.
return nsnull;
}
nsIFrame* f = mFrames.FirstChild();
PRInt32 count;
for (count = 0; f && count < MIN_ROWS_NEEDING_CURSOR; ++count) {
f = f->GetNextSibling();
}
if (!f) {
// Less than MIN_ROWS_NEEDING_CURSOR rows, so just don't bother
return nsnull;
}
FrameCursorData* data = new FrameCursorData();
if (!data)
return nsnull;
Properties().Set(RowCursorProperty(), data);
AddStateBits(NS_ROWGROUP_HAS_ROW_CURSOR);
return data;
}
nsIFrame*
nsTableRowGroupFrame::GetFirstRowContaining(nscoord aY, nscoord* aOverflowAbove)
{
if (!(GetStateBits() & NS_ROWGROUP_HAS_ROW_CURSOR))
return nsnull;
FrameCursorData* property = static_cast<FrameCursorData*>
(Properties().Get(RowCursorProperty()));
PRUint32 cursorIndex = property->mCursorIndex;
PRUint32 frameCount = property->mFrames.Length();
if (cursorIndex >= frameCount)
return nsnull;
nsIFrame* cursorFrame = property->mFrames[cursorIndex];
// The cursor's frame list excludes frames with empty overflow-area, so
// we don't need to check that here.
// We use property->mOverflowBelow here instead of computing the frame's
// true overflowArea.YMost(), because it is essential for the thresholds
// to form a monotonically increasing sequence. Otherwise we would break
// encountering a row whose overflowArea.YMost() is <= aY but which has
// a row above it containing cell(s) that span to include aY.
while (cursorIndex > 0 &&
cursorFrame->GetRect().YMost() + property->mOverflowBelow > aY) {
--cursorIndex;
cursorFrame = property->mFrames[cursorIndex];
}
while (cursorIndex + 1 < frameCount &&
cursorFrame->GetRect().YMost() + property->mOverflowBelow <= aY) {
++cursorIndex;
cursorFrame = property->mFrames[cursorIndex];
}
property->mCursorIndex = cursorIndex;
*aOverflowAbove = property->mOverflowAbove;
return cursorFrame;
}
bool
nsTableRowGroupFrame::FrameCursorData::AppendFrame(nsIFrame* aFrame)
{
nsRect overflowRect = aFrame->GetVisualOverflowRect();
if (overflowRect.IsEmpty())
return true;
nscoord overflowAbove = -overflowRect.y;
nscoord overflowBelow = overflowRect.YMost() - aFrame->GetSize().height;
mOverflowAbove = NS_MAX(mOverflowAbove, overflowAbove);
mOverflowBelow = NS_MAX(mOverflowBelow, overflowBelow);
return mFrames.AppendElement(aFrame) != nsnull;
}
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