The Tor Browser: layout/generic/nsPageFrame.cpp@6474c204b198 (annotated)

layout/generic/nsPageFrame.cpp@6474c204b198 (annotated)

layout/generic/nsPageFrame.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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 "nsPageFrame.h"
 #include "nsPresContext.h"
 #include "nsRenderingContext.h"
 #include "nsGkAtoms.h"
 #include "nsIPresShell.h"
 #include "nsPageContentFrame.h"
 #include "nsDisplayList.h"
 #include "nsLayoutUtils.h" // for function BinarySearchForPosition
 #include "nsSimplePageSequenceFrame.h" // for nsSharedPageData
 #include "nsTextFormatter.h" // for page number localization formatting
 #include "nsBidiUtils.h"
 #include "nsIPrintSettings.h"
 #include "prlog.h"
 #ifdef PR_LOGGING
 extern PRLogModuleInfo *GetLayoutPrintingLog();
 #define PR_PL(_p1)  PR_LOG(GetLayoutPrintingLog(), PR_LOG_DEBUG, _p1)
 #else
 #define PR_PL(_p1)
 #endif
 using namespace mozilla;
 nsIFrame*
 NS_NewPageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsPageFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsPageFrame)
 nsPageFrame::nsPageFrame(nsStyleContext* aContext)
 : nsContainerFrame(aContext)
 {
 }
 nsPageFrame::~nsPageFrame()
 {
 }
 nsresult 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;
     }
     nsSize  maxSize(mPD->mReflowSize.width, avHeight);
     float scale = aPresContext->GetPageScale();
     maxSize.width = NSToCoordCeil(maxSize.width / scale);
     if (maxSize.height != NS_UNCONSTRAINEDSIZE) {
       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 = true;
     kidReflowState.mFlags.mTableIsSplittable = true;
     // Use the margins given in the @page rule.
     // If a margin is 'auto', use the margin from the print settings for that side.
     nsMargin pageContentMargin;
     const nsStyleSides& marginStyle = kidReflowState.mStyleMargin->mMargin;
     NS_FOR_CSS_SIDES(side) {
       if (marginStyle.GetUnit(side) == eStyleUnit_Auto) {
         pageContentMargin.Side(side) = mPD->mReflowMargin.Side(side);
       } else {
         pageContentMargin.Side(side) = kidReflowState.ComputedPhysicalMargin().Side(side);
       }
     }
     nscoord maxWidth = maxSize.width - pageContentMargin.LeftRight() / scale;
     nscoord maxHeight;
     if (maxSize.height == NS_UNCONSTRAINEDSIZE) {
       maxHeight = NS_UNCONSTRAINEDSIZE;
     } else {
       maxHeight = maxSize.height - pageContentMargin.TopBottom() / scale;
     }
     // Check the width and height, if they're too small we reset the margins
     // back to the default.
     if (maxWidth < onePixelInTwips ||
        (maxHeight != NS_UNCONSTRAINEDSIZE && maxHeight < onePixelInTwips)) {
       NS_FOR_CSS_SIDES(side) {
         pageContentMargin.Side(side) = mPD->mReflowMargin.Side(side);
       }
       maxWidth = maxSize.width - pageContentMargin.LeftRight() / scale;
       if (maxHeight != NS_UNCONSTRAINEDSIZE) {
         maxHeight = maxSize.height - pageContentMargin.TopBottom() / scale;
       }
     }
     kidReflowState.SetComputedWidth(maxWidth);
     kidReflowState.SetComputedHeight(maxHeight);
     // calc location of frame
     nscoord xc = pageContentMargin.left;
     nscoord yc = pageContentMargin.top;
     // Get the child's desired size
     ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, xc, yc, 0, aStatus);
     // Place and size the child
     FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowState, 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();
   }
   aDesiredSize.SetOverflowAreasToDesiredBounds();
   FinishAndStoreOverflow(&aDesiredSize);
   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_FRAME_DUMP
 nsresult
 nsPageFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("Page"), aResult);
 }
 #endif
 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) {
     aNewStr.ReplaceSubstring(kDate.get(), mPD->mDateTimeStr.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) {
     char16_t * uStr = nsTextFormatter::smprintf(mPD->mPageNumAndTotalsFormat.get(), 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) {
     char16_t * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat.get(), mPageNum);
     aNewStr.ReplaceSubstring(kPage.get(), uStr);
     nsMemory::Free(uStr);
   }
   NS_NAMED_LITERAL_STRING(kTitle, "&T");
   if (aStr.Find(kTitle) != kNotFound) {
     aNewStr.ReplaceSubstring(kTitle.get(), mPD->mDocTitle.get());
   }
   NS_NAMED_LITERAL_STRING(kDocURL, "&U");
   if (aStr.Find(kDocURL) != kNotFound) {
     aNewStr.ReplaceSubstring(kDocURL.get(), mPD->mDocURL.get());
   }
   NS_NAMED_LITERAL_STRING(kPageTotal, "&L");
   if (aStr.Find(kPageTotal) != kNotFound) {
     char16_t * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat.get(), mTotNumPages);
     aNewStr.ReplaceSubstring(kPageTotal.get(), uStr);
     nsMemory::Free(uStr);
   }
 }
 //------------------------------------------------------------------------------
 nscoord nsPageFrame::GetXPosition(nsRenderingContext& aRenderingContext,
                                   const nsRect&        aRect,
                                   int32_t              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->mEdgePaperMargin.left;
       break;
     case nsIPrintSettings::kJustCenter:
       x += (aRect.width - width) / 2;
       break;
     case nsIPrintSettings::kJustRight:
       x += aRect.width - width - 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(nsRenderingContext& aRenderingContext,
                               nsHeaderFooterEnum   aHeaderFooter,
                               const nsString&      aStrLeft,
                               const nsString&      aStrCenter,
                               const nsString&      aStrRight,
                               const nsRect&        aRect,
                               nscoord              aAscent,
                               nscoord              aHeight)
 {
   int32_t 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 context to 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(nsRenderingContext& aRenderingContext,
                               nsHeaderFooterEnum   aHeaderFooter,
                               int32_t              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);
     int32_t indx;
     int32_t textWidth = 0;
     const char16_t* text = str.get();
     int32_t len = (int32_t)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,
                                 int32_t(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
     }
     if (HasRTLChars(str)) {
       PresContext()->SetBidiEnabled();
     }
     // 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->mEdgePaperMargin.top;
     } else {
       y = aRect.YMost() - aHeight - mPD->mEdgePaperMargin.bottom;
     }
     // set up new clip and draw the text
     aRenderingContext.PushState();
     aRenderingContext.SetColor(NS_RGB(0,0,0));
     aRenderingContext.IntersectClip(aRect);
     nsLayoutUtils::DrawString(this, &aRenderingContext, str.get(), str.Length(), nsPoint(x, y + aAscent));
     aRenderingContext.PopState();
   }
 }
 /**
  * Remove all leaf display items that are not for descendants of
  * aBuilder->GetReferenceFrame() from aList.
  * @param aPage the page we're constructing the display list for
  * @param aExtraPage the page we constructed aList for
  * @param aList the list that is modified in-place
  */
 static void
 PruneDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
                              nsPageFrame* aPage, nsIFrame* aExtraPage,
                              nsDisplayList* aList)
 {
   nsDisplayList newList;
   while (true) {
     nsDisplayItem* i = aList->RemoveBottom();
     if (!i)
       break;
     nsDisplayList* subList = i->GetSameCoordinateSystemChildren();
     if (subList) {
       PruneDisplayListForExtraPage(aBuilder, aPage, aExtraPage, subList);
       i->UpdateBounds(aBuilder);
     } else {
       nsIFrame* f = i->Frame();
       if (!nsLayoutUtils::IsProperAncestorFrameCrossDoc(aPage, f)) {
         // We're throwing this away so call its destructor now. The memory
         // is owned by aBuilder which destroys all items at once.
         i->~nsDisplayItem();
         continue;
       }
     }
     newList.AppendToTop(i);
   }
   aList->AppendToTop(&newList);
 }
 static nsresult
 BuildDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
                              nsPageFrame* aPage, nsIFrame* aExtraPage,
                              nsDisplayList* aList)
 {
   nsDisplayList list;
   // Pass an empty dirty rect since we're only interested in finding
   // placeholders whose out-of-flows are in the page
   // aBuilder->GetReferenceFrame(), and the paths to those placeholders
   // have already been marked as NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO.
   // Note that we should still do a prune step since we don't want to
   // rely on dirty-rect checking for correctness.
   aExtraPage->BuildDisplayListForStackingContext(aBuilder, nsRect(), &list);
   PruneDisplayListForExtraPage(aBuilder, aPage, aExtraPage, &list);
   aList->AppendToTop(&list);
   return NS_OK;
 }
 static nsIFrame*
 GetNextPage(nsIFrame* aPageContentFrame)
 {
   // XXX ugh
   nsIFrame* pageFrame = aPageContentFrame->GetParent();
   NS_ASSERTION(pageFrame->GetType() == nsGkAtoms::pageFrame,
                "pageContentFrame has unexpected parent");
   nsIFrame* nextPageFrame = pageFrame->GetNextSibling();
   if (!nextPageFrame)
     return nullptr;
   NS_ASSERTION(nextPageFrame->GetType() == nsGkAtoms::pageFrame,
                "pageFrame's sibling is not a page frame...");
   nsIFrame* f = nextPageFrame->GetFirstPrincipalChild();
   NS_ASSERTION(f, "pageFrame has no page content frame!");
   NS_ASSERTION(f->GetType() == nsGkAtoms::pageContentFrame,
                "pageFrame's child is not page content!");
   return f;
 }
 static void PaintHeaderFooter(nsIFrame* aFrame, nsRenderingContext* aCtx,
                               const nsRect& aDirtyRect, nsPoint aPt)
 {
   static_cast<nsPageFrame*>(aFrame)->PaintHeaderFooter(*aCtx, aPt);
 }
 static gfx3DMatrix ComputePageTransform(nsIFrame* aFrame, float aAppUnitsPerPixel)
 {
   float scale = aFrame->PresContext()->GetPageScale();
   return gfx3DMatrix::ScalingMatrix(scale, scale, 1);
 }
 //------------------------------------------------------------------------------
 void
 nsPageFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                               const nsRect&           aDirtyRect,
                               const nsDisplayListSet& aLists)
 {
   nsDisplayListCollection set;
   if (PresContext()->IsScreen()) {
     DisplayBorderBackgroundOutline(aBuilder, aLists);
   }
   nsIFrame *child = mFrames.FirstChild();
   float scale = PresContext()->GetPageScale();
   nsRect clipRect(nsPoint(0, 0), child->GetSize());
   // Note: this computation matches how we compute maxSize.height
   // in nsPageFrame::Reflow
   nscoord expectedPageContentHeight = NSToCoordCeil(GetSize().height / scale);
   if (clipRect.height > expectedPageContentHeight) {
     // We're doing print-selection, with one long page-content frame.
     // Clip to the appropriate page-content slice for the current page.
     NS_ASSERTION(mPageNum > 0, "page num should be positive");
     // Note: The pageContentFrame's y-position has been set such that a zero
     // y-value matches the top edge of the current page.  So, to clip to the
     // current page's content (in coordinates *relative* to the page content
     // frame), we just negate its y-position and add the top margin.
     clipRect.y = NSToCoordCeil((-child->GetRect().y +
                                 mPD->mReflowMargin.top) / scale);
     clipRect.height = expectedPageContentHeight;
     NS_ASSERTION(clipRect.y < child->GetSize().height,
                  "Should be clipping to region inside the page content bounds");
   }
   clipRect += aBuilder->ToReferenceFrame(child);
   nsDisplayList content;
   {
     DisplayListClipState::AutoSaveRestore clipState(aBuilder);
     // Overwrite current clip, since we're going to wrap in a transform
     // and the current clip is no longer meaningful.
     clipState.Clear();
     clipState.ClipContainingBlockDescendants(clipRect, nullptr);
     child->BuildDisplayListForStackingContext(aBuilder,
       child->GetVisualOverflowRectRelativeToSelf(), &content);
     // We may need to paint out-of-flow frames whose placeholders are
     // on other pages. Add those pages to our display list. Note that
     // out-of-flow frames can't be placed after their placeholders so
     // we don't have to process earlier pages. The display lists for
     // these extra pages are pruned so that only display items for the
     // page we currently care about (which we would have reached by
     // following placeholders to their out-of-flows) end up on the list.
     nsIFrame* page = child;
     while ((page = GetNextPage(page)) != nullptr) {
       BuildDisplayListForExtraPage(aBuilder, this, page, &content);
     }
     // Add the canvas background color to the bottom of the list. This
     // happens after we've built the list so that AddCanvasBackgroundColorItem
     // can monkey with the contents if necessary.
     nsRect backgroundRect =
       nsRect(aBuilder->ToReferenceFrame(child), child->GetSize());
     PresContext()->GetPresShell()->AddCanvasBackgroundColorItem(
       *aBuilder, content, child, backgroundRect, NS_RGBA(0,0,0,0));
   }
   content.AppendNewToTop(new (aBuilder) nsDisplayTransform(aBuilder, child, &content, ::ComputePageTransform));
   set.Content()->AppendToTop(&content);
   if (PresContext()->IsRootPaginatedDocument()) {
     set.Content()->AppendNewToTop(new (aBuilder)
         nsDisplayGeneric(aBuilder, this, ::PaintHeaderFooter,
                          "HeaderFooter",
                          nsDisplayItem::TYPE_HEADER_FOOTER));
   }
   set.MoveTo(aLists);
 }
 //------------------------------------------------------------------------------
 void
 nsPageFrame::SetPageNumInfo(int32_t aPageNumber, int32_t aTotalPages)
 {
   mPageNum     = aPageNumber;
   mTotNumPages = aTotalPages;
 }
 void
 nsPageFrame::PaintHeaderFooter(nsRenderingContext& 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, mRect.Size());
   aRenderingContext.SetColor(NS_RGB(0,0,0));
   // Get the FontMetrics to determine width.height of strings
   nsRefPtr<nsFontMetrics> fontMet;
   pc->DeviceContext()->GetMetricsFor(mPD->mHeadFootFont, nullptr,
                                      pc->GetUserFontSet(),
                                      pc->GetTextPerfMetrics(),
                                      *getter_AddRefs(fontMet));
   aRenderingContext.SetFont(fontMet);
   nscoord ascent = 0;
   nscoord visibleHeight = 0;
   if (fontMet) {
     visibleHeight = fontMet->MaxHeight();
     ascent = fontMet->MaxAscent();
   }
   // 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::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);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsPageBreakFrame)
 nsPageBreakFrame::nsPageBreakFrame(nsStyleContext* aContext) :
   nsLeafFrame(aContext), mHaveReflowed(false)
 {
 }
 nsPageBreakFrame::~nsPageBreakFrame()
 {
 }
 nscoord
 nsPageBreakFrame::GetIntrinsicWidth()
 {
   return nsPresContext::CSSPixelsToAppUnits(1);
 }
 nscoord
 nsPageBreakFrame::GetIntrinsicHeight()
 {
   return 0;
 }
 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 ?
 : 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 = true;
   aStatus = NS_FRAME_COMPLETE;
   return NS_OK;
 }
 nsIAtom*
 nsPageBreakFrame::GetType() const
 {
   return nsGkAtoms::pageBreakFrame;
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsPageBreakFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("PageBreak"), aResult);
 }
 #endif

The Tor Browser / annotate

layout/generic/nsPageFrame.cpp@6474c204b198 (annotated)

layout/generic/nsPageFrame.cpp