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gecko-dev/layout/generic/nsPageFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsPageFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsIRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsIPresShell.h"
#include "nsCSSFrameConstructor.h"
#include "nsIDeviceContext.h"
#include "nsReadableUtils.h"
#include "nsPageContentFrame.h"
#include "nsDisplayList.h"
#include "nsLayoutUtils.h" // for function BinarySearchForPosition
#include "nsCSSRendering.h"
#include "nsSimplePageSequence.h" // for nsSharedPageData
#include "nsTextFormatter.h" // for page number localization formatting
#ifdef IBMBIDI
#include "nsBidiUtils.h"
#include "nsBidiPresUtils.h"
#endif
#include "nsIFontMetrics.h"
#include "nsIPrintSettings.h"
#include "nsRegion.h"
#include "prlog.h"
#ifdef PR_LOGGING
extern PRLogModuleInfo * kLayoutPrintingLogMod;
#define PR_PL(_p1) PR_LOG(kLayoutPrintingLogMod, PR_LOG_DEBUG, _p1)
#else
#define PR_PL(_p1)
#endif
nsIFrame*
NS_NewPageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsPageFrame(aContext);
}
nsPageFrame::nsPageFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
{
}
nsPageFrame::~nsPageFrame()
{
}
NS_IMETHODIMP nsPageFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsPageFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
aStatus = NS_FRAME_COMPLETE; // initialize out parameter
NS_ASSERTION(mFrames.FirstChild() &&
nsGkAtoms::pageContentFrame == mFrames.FirstChild()->GetType(),
"pageFrame must have a pageContentFrame child");
// Resize our frame allowing it only to be as big as we are
// XXX Pay attention to the page's border and padding...
if (mFrames.NotEmpty()) {
nsIFrame* frame = mFrames.FirstChild();
// When the reflow size is NS_UNCONSTRAINEDSIZE it means we are reflowing
// a single page to print selection. So this means we want to use
// NS_UNCONSTRAINEDSIZE without altering it
nscoord avHeight;
if (mPD->mReflowSize.height == NS_UNCONSTRAINEDSIZE) {
avHeight = NS_UNCONSTRAINEDSIZE;
} else {
avHeight = mPD->mReflowSize.height - mPD->mReflowMargin.TopBottom();
}
nsSize maxSize(mPD->mReflowSize.width - mPD->mReflowMargin.LeftRight(),
avHeight);
float scale = aPresContext->GetPageScale();
maxSize.width = NSToCoordCeil(maxSize.width / scale);
maxSize.height = NSToCoordCeil(maxSize.height / scale);
// Get the number of Twips per pixel from the PresContext
nscoord onePixelInTwips = nsPresContext::CSSPixelsToAppUnits(1);
// insurance against infinite reflow, when reflowing less than a pixel
// XXX Shouldn't we do something more friendly when invalid margins
// are set?
if (maxSize.width < onePixelInTwips || maxSize.height < onePixelInTwips) {
aDesiredSize.width = 0;
aDesiredSize.height = 0;
NS_WARNING("Reflow aborted; no space for content");
return NS_OK;
}
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);
kidReflowState.mFlags.mIsTopOfPage = PR_TRUE;
kidReflowState.mFlags.mTableIsSplittable = PR_TRUE;
// calc location of frame
nscoord xc = mPD->mReflowMargin.left + mPD->mExtraMargin.left;
nscoord yc = mPD->mReflowMargin.top + mPD->mExtraMargin.top;
// Get the child's desired size
ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, xc, yc, 0, aStatus);
// Place and size the child
FinishReflowChild(frame, aPresContext, &kidReflowState, aDesiredSize, xc, yc, 0);
NS_ASSERTION(!NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||
!frame->GetNextInFlow(), "bad child flow list");
}
PR_PL(("PageFrame::Reflow %p ", this));
PR_PL(("[%d,%d][%d,%d]\n", aDesiredSize.width, aDesiredSize.height, aReflowState.availableWidth, aReflowState.availableHeight));
// Return our desired size
aDesiredSize.width = aReflowState.availableWidth;
if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
aDesiredSize.height = aReflowState.availableHeight;
}
PR_PL(("PageFrame::Reflow %p ", this));
PR_PL(("[%d,%d]\n", aReflowState.availableWidth, aReflowState.availableHeight));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
nsIAtom*
nsPageFrame::GetType() const
{
return nsGkAtoms::pageFrame;
}
#ifdef DEBUG
NS_IMETHODIMP
nsPageFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Page"), aResult);
}
#endif
/* virtual */ PRBool
nsPageFrame::IsContainingBlock() const
{
return PR_TRUE;
}
void
nsPageFrame::ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr)
{
aNewStr = aStr;
// Search to see if the &D code is in the string
// then subst in the current date/time
NS_NAMED_LITERAL_STRING(kDate, "&D");
if (aStr.Find(kDate) != kNotFound) {
if (mPD->mDateTimeStr != nsnull) {
aNewStr.ReplaceSubstring(kDate.get(), mPD->mDateTimeStr);
} else {
aNewStr.ReplaceSubstring(kDate.get(), EmptyString().get());
}
}
// NOTE: Must search for &PT before searching for &P
//
// Search to see if the "page number and page" total code are in the string
// and replace the page number and page total code with the actual
// values
NS_NAMED_LITERAL_STRING(kPageAndTotal, "&PT");
if (aStr.Find(kPageAndTotal) != kNotFound) {
PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumAndTotalsFormat, mPageNum, mTotNumPages);
aNewStr.ReplaceSubstring(kPageAndTotal.get(), uStr);
nsMemory::Free(uStr);
}
// Search to see if the page number code is in the string
// and replace the page number code with the actual value
NS_NAMED_LITERAL_STRING(kPage, "&P");
if (aStr.Find(kPage) != kNotFound) {
PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mPageNum);
aNewStr.ReplaceSubstring(kPage.get(), uStr);
nsMemory::Free(uStr);
}
NS_NAMED_LITERAL_STRING(kTitle, "&T");
if (aStr.Find(kTitle) != kNotFound) {
if (mPD->mDocTitle != nsnull) {
aNewStr.ReplaceSubstring(kTitle.get(), mPD->mDocTitle);
} else {
aNewStr.ReplaceSubstring(kTitle.get(), EmptyString().get());
}
}
NS_NAMED_LITERAL_STRING(kDocURL, "&U");
if (aStr.Find(kDocURL) != kNotFound) {
if (mPD->mDocURL != nsnull) {
aNewStr.ReplaceSubstring(kDocURL.get(), mPD->mDocURL);
} else {
aNewStr.ReplaceSubstring(kDocURL.get(), EmptyString().get());
}
}
NS_NAMED_LITERAL_STRING(kPageTotal, "&L");
if (aStr.Find(kPageTotal) != kNotFound) {
PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mTotNumPages);
aNewStr.ReplaceSubstring(kPageTotal.get(), uStr);
nsMemory::Free(uStr);
}
}
//------------------------------------------------------------------------------
nscoord nsPageFrame::GetXPosition(nsIRenderingContext& aRenderingContext,
const nsRect& aRect,
PRInt32 aJust,
const nsString& aStr)
{
nscoord width = nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
aStr.get(), aStr.Length());
nscoord x = aRect.x;
switch (aJust) {
case nsIPrintSettings::kJustLeft:
x += mPD->mExtraMargin.left + mPD->mEdgePaperMargin.left;
break;
case nsIPrintSettings::kJustCenter:
x += (aRect.width - width) / 2;
break;
case nsIPrintSettings::kJustRight:
x += aRect.width - width - mPD->mExtraMargin.right - mPD->mEdgePaperMargin.right;
break;
} // switch
return x;
}
// Draw a header or footer
// @param aRenderingContext - rendering content ot draw into
// @param aHeaderFooter - indicates whether it is a header or footer
// @param aStrLeft - string for the left header or footer; can be empty
// @param aStrCenter - string for the center header or footer; can be empty
// @param aStrRight - string for the right header or footer; can be empty
// @param aRect - the rect of the page
// @param aAscent - the ascent of the font
// @param aHeight - the height of the font
void
nsPageFrame::DrawHeaderFooter(nsIRenderingContext& aRenderingContext,
nsHeaderFooterEnum aHeaderFooter,
const nsString& aStrLeft,
const nsString& aStrCenter,
const nsString& aStrRight,
const nsRect& aRect,
nscoord aAscent,
nscoord aHeight)
{
PRInt32 numStrs = 0;
if (!aStrLeft.IsEmpty()) numStrs++;
if (!aStrCenter.IsEmpty()) numStrs++;
if (!aStrRight.IsEmpty()) numStrs++;
if (numStrs == 0) return;
nscoord strSpace = aRect.width / numStrs;
if (!aStrLeft.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aHeaderFooter,
nsIPrintSettings::kJustLeft, aStrLeft, aRect, aAscent,
aHeight, strSpace);
}
if (!aStrCenter.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aHeaderFooter,
nsIPrintSettings::kJustCenter, aStrCenter, aRect, aAscent,
aHeight, strSpace);
}
if (!aStrRight.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aHeaderFooter,
nsIPrintSettings::kJustRight, aStrRight, aRect, aAscent,
aHeight, strSpace);
}
}
// Draw a header or footer string
// @param aRenderingContext - rendering content ot draw into
// @param aHeaderFooter - indicates whether it is a header or footer
// @param aJust - indicates where the string is located within the header/footer
// @param aStr - the string to be drawn
// @param aRect - the rect of the page
// @param aHeight - the height of the font
// @param aAscent - the ascent of the font
// @param aWidth - available width for the string
void
nsPageFrame::DrawHeaderFooter(nsIRenderingContext& aRenderingContext,
nsHeaderFooterEnum aHeaderFooter,
PRInt32 aJust,
const nsString& aStr,
const nsRect& aRect,
nscoord aAscent,
nscoord aHeight,
nscoord aWidth)
{
nscoord contentWidth = aWidth - (mPD->mEdgePaperMargin.left + mPD->mEdgePaperMargin.right);
if ((aHeaderFooter == eHeader && aHeight < mPD->mReflowMargin.top) ||
(aHeaderFooter == eFooter && aHeight < mPD->mReflowMargin.bottom)) {
nsAutoString str;
ProcessSpecialCodes(aStr, str);
PRInt32 indx;
PRInt32 textWidth = 0;
const PRUnichar* text = str.get();
PRInt32 len = (PRInt32)str.Length();
if (len == 0) {
return; // bail is empty string
}
// find how much text fits, the "position" is the size of the available area
if (nsLayoutUtils::BinarySearchForPosition(&aRenderingContext, text, 0, 0, 0, len,
PRInt32(contentWidth), indx, textWidth)) {
if (indx < len-1 ) {
// we can't fit in all the text
if (indx > 3) {
// But we can fit in at least 4 chars. Show all but 3 of them, then
// an ellipsis.
// XXXbz for non-plane0 text, this may be cutting things in the
// middle of a codepoint! Also, we have no guarantees that the three
// dots will fit in the space the three chars we removed took up with
// these font metrics!
str.Truncate(indx-3);
str.AppendLiteral("...");
} else {
// We can only fit 3 or fewer chars. Just show nothing
str.Truncate();
}
}
} else {
return; // bail if couldn't find the correct length
}
// cacl the x and y positions of the text
nscoord x = GetXPosition(aRenderingContext, aRect, aJust, str);
nscoord y;
if (aHeaderFooter == eHeader) {
y = aRect.y + mPD->mExtraMargin.top + mPD->mEdgePaperMargin.top;
} else {
y = aRect.YMost() - aHeight - mPD->mExtraMargin.bottom - mPD->mEdgePaperMargin.bottom;
}
// set up new clip and draw the text
aRenderingContext.PushState();
aRenderingContext.SetColor(NS_RGB(0,0,0));
aRenderingContext.SetClipRect(aRect, nsClipCombine_kReplace);
nsLayoutUtils::DrawString(this, &aRenderingContext, str.get(), str.Length(), nsPoint(x, y + aAscent));
aRenderingContext.PopState();
}
}
static void PaintPrintPreviewBackground(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt)
{
static_cast<nsPageFrame*>(aFrame)->PaintPrintPreviewBackground(*aCtx, aPt);
}
static void PaintPageContent(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt)
{
static_cast<nsPageFrame*>(aFrame)->PaintPageContent(*aCtx, aDirtyRect, aPt);
}
static void PaintHeaderFooter(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt)
{
static_cast<nsPageFrame*>(aFrame)->PaintHeaderFooter(*aCtx, aPt);
}
//------------------------------------------------------------------------------
NS_IMETHODIMP
nsPageFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsDisplayListCollection set;
nsresult rv;
if (PresContext()->IsScreen()) {
rv = set.BorderBackground()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(this, ::PaintPrintPreviewBackground, "PrintPreviewBackground"));
NS_ENSURE_SUCCESS(rv, rv);
}
rv = set.BorderBackground()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(this, ::PaintPageContent, "PageContent"));
NS_ENSURE_SUCCESS(rv, rv);
if (PresContext()->IsRootPaginatedDocument()) {
rv = set.Content()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(this, ::PaintHeaderFooter, "HeaderFooter"));
NS_ENSURE_SUCCESS(rv, rv);
}
set.MoveTo(aLists);
return NS_OK;
}
//------------------------------------------------------------------------------
void
nsPageFrame::SetPageNumInfo(PRInt32 aPageNumber, PRInt32 aTotalPages)
{
mPageNum = aPageNumber;
mTotNumPages = aTotalPages;
}
void
nsPageFrame::PaintPrintPreviewBackground(nsIRenderingContext& aRenderingContext,
nsPoint aPt)
{
// fill page with White
aRenderingContext.SetColor(NS_RGB(255,255,255));
// REVIEW: this used to have rect's width and height be the
// mClipRect if specialClipIsSet ... but that seems completely bogus
// and inconsistent with the painting of the shadow below
nsRect rect(aPt, GetSize());
rect.width -= mPD->mShadowSize.width;
rect.height -= mPD->mShadowSize.height;
aRenderingContext.FillRect(rect);
// draw line around outside of page
aRenderingContext.SetColor(NS_RGB(0,0,0));
aRenderingContext.DrawRect(rect);
if (mPD->mShadowSize.width > 0 && mPD->mShadowSize.height > 0) {
aRenderingContext.SetColor(NS_RGB(51,51,51));
nsRect r(aPt.x,aPt.y, mRect.width, mRect.height);
nsRect shadowRect;
shadowRect.x = r.x + r.width - mPD->mShadowSize.width;
shadowRect.y = r.y + mPD->mShadowSize.height;
shadowRect.width = mPD->mShadowSize.width;
shadowRect.height = r.height - mPD->mShadowSize.height;
aRenderingContext.FillRect(shadowRect);
shadowRect.x = r.x + mPD->mShadowSize.width;
shadowRect.y = r.y + r.height - mPD->mShadowSize.height;
shadowRect.width = r.width - mPD->mShadowSize.width;
shadowRect.height = mPD->mShadowSize.height;
aRenderingContext.FillRect(shadowRect);
}
}
void
nsPageFrame::PaintHeaderFooter(nsIRenderingContext& aRenderingContext,
nsPoint aPt)
{
nsPresContext* pc = PresContext();
if (!mPD->mPrintSettings) {
if (pc->Type() == nsPresContext::eContext_PrintPreview || pc->IsDynamic())
mPD->mPrintSettings = pc->GetPrintSettings();
if (!mPD->mPrintSettings)
return;
}
nsRect rect(aPt.x, aPt.y, mRect.width - mPD->mShadowSize.width,
mRect.height - mPD->mShadowSize.height);
aRenderingContext.SetFont(*mPD->mHeadFootFont, nsnull);
aRenderingContext.SetColor(NS_RGB(0,0,0));
// Get the FontMetrics to determine width.height of strings
nsCOMPtr<nsIFontMetrics> fontMet;
pc->DeviceContext()->GetMetricsFor(*mPD->mHeadFootFont, nsnull,
*getter_AddRefs(fontMet));
nscoord ascent = 0;
nscoord visibleHeight = 0;
if (fontMet) {
fontMet->GetHeight(visibleHeight);
fontMet->GetMaxAscent(ascent);
}
// print document headers and footers
nsXPIDLString headerLeft, headerCenter, headerRight;
mPD->mPrintSettings->GetHeaderStrLeft(getter_Copies(headerLeft));
mPD->mPrintSettings->GetHeaderStrCenter(getter_Copies(headerCenter));
mPD->mPrintSettings->GetHeaderStrRight(getter_Copies(headerRight));
DrawHeaderFooter(aRenderingContext, eHeader,
headerLeft, headerCenter, headerRight,
rect, ascent, visibleHeight);
nsXPIDLString footerLeft, footerCenter, footerRight;
mPD->mPrintSettings->GetFooterStrLeft(getter_Copies(footerLeft));
mPD->mPrintSettings->GetFooterStrCenter(getter_Copies(footerCenter));
mPD->mPrintSettings->GetFooterStrRight(getter_Copies(footerRight));
DrawHeaderFooter(aRenderingContext, eFooter,
footerLeft, footerCenter, footerRight,
rect, ascent, visibleHeight);
}
//------------------------------------------------------------------------------
void
nsPageFrame::PaintPageContent(nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsPoint aPt) {
nsIFrame* pageContentFrame = mFrames.FirstChild();
nsRect rect = aDirtyRect;
float scale = PresContext()->GetPageScale();
aRenderingContext.PushState();
// Make sure we don't draw where we aren't supposed to draw, especially
// when printing selection
nsRect clipRect(nsPoint(0, 0), GetSize());
clipRect.Deflate(mPD->mReflowMargin);
aRenderingContext.SetClipRect(clipRect, nsClipCombine_kIntersect);
// aPt translates to coords relative to this, then margins translate to
// pageContentFrame's coords
nsPoint framePos = aPt + pageContentFrame->GetOffsetTo(this);
aRenderingContext.Translate(framePos.x, framePos.y);
rect -= framePos;
aRenderingContext.Scale(scale, scale);
rect.ScaleRoundOut(1.0f / scale);
const nsStyleBorder* border = GetStyleBorder();
const nsStylePadding* padding = GetStylePadding();
nsRect backgroundRect = nsRect(nsPoint(0, 0), pageContentFrame->GetSize());
nsCSSRendering::PaintBackground(PresContext(), aRenderingContext, this,
rect, backgroundRect, *border, *padding,
PR_TRUE);
nsLayoutUtils::PaintFrame(&aRenderingContext, pageContentFrame,
nsRegion(rect), NS_RGBA(0,0,0,0));
aRenderingContext.PopState();
}
void
nsPageFrame::SetSharedPageData(nsSharedPageData* aPD)
{
mPD = aPD;
// Set the shared data into the page frame before reflow
nsPageContentFrame * pcf = static_cast<nsPageContentFrame*>(mFrames.FirstChild());
if (pcf) {
pcf->SetSharedPageData(mPD);
}
}
nsIFrame*
NS_NewPageBreakFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
NS_PRECONDITION(aPresShell, "null PresShell");
//check that we are only creating page break frames when printing
NS_ASSERTION(aPresShell->GetPresContext()->IsPaginated(), "created a page break frame while not printing");
return new (aPresShell) nsPageBreakFrame(aContext);
}
nsPageBreakFrame::nsPageBreakFrame(nsStyleContext* aContext) :
nsLeafFrame(aContext), mHaveReflowed(PR_FALSE)
{
}
nsPageBreakFrame::~nsPageBreakFrame()
{
}
nscoord
nsPageBreakFrame::GetIntrinsicWidth()
{
return nsPresContext::CSSPixelsToAppUnits(1);
}
nsresult
nsPageBreakFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsPageBreakFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
// Override reflow, since we don't want to deal with what our
// computed values are.
aDesiredSize.width = GetIntrinsicWidth();
aDesiredSize.height = (aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE ?
0 : aReflowState.availableHeight);
// round the height down to the nearest pixel
aDesiredSize.height -=
aDesiredSize.height % nsPresContext::CSSPixelsToAppUnits(1);
// Note: not using NS_FRAME_FIRST_REFLOW here, since it's not clear whether
// DidReflow will always get called before the next Reflow() call.
mHaveReflowed = PR_TRUE;
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
nsIAtom*
nsPageBreakFrame::GetType() const
{
return nsGkAtoms::pageBreakFrame;
}
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