layout/generic/nsPageFrame.cpp

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  37
  38 #include "nsPageFrame.h"
  39 #include "nsPresContext.h"
  40 #include "nsStyleContext.h"
  41 #include "nsIRenderingContext.h"
  42 #include "nsGkAtoms.h"
  43 #include "nsIPresShell.h"
  44 #include "nsCSSFrameConstructor.h"
  45 #include "nsIDeviceContext.h"
  46 #include "nsReadableUtils.h"
  47 #include "nsPageContentFrame.h"
  48 #include "nsDisplayList.h"
  49 #include "nsLayoutUtils.h" // for function BinarySearchForPosition
  50 #include "nsCSSRendering.h"
  51 #include "nsSimplePageSequence.h" // for nsSharedPageData
  52 #include "nsTextFormatter.h" // for page number localization formatting
  53 #ifdef IBMBIDI
  54 #include "nsBidiUtils.h"
  55 #endif
  56 #include "nsIFontMetrics.h"
  57 #include "nsIPrintSettings.h"
  58 #include "nsRegion.h"
  59
  60 #include "prlog.h"
  61 #ifdef PR_LOGGING
  62 extern PRLogModuleInfo * kLayoutPrintingLogMod;
  63 #define PR_PL(_p1)  PR_LOG(kLayoutPrintingLogMod, PR_LOG_DEBUG, _p1)
  64 #else
  65 #define PR_PL(_p1)
  66 #endif
  67
  68 nsIFrame*
  69 NS_NewPageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  70 {
  71   return new (aPresShell) nsPageFrame(aContext);
  72 }
  73
  74 NS_IMPL_FRAMEARENA_HELPERS(nsPageFrame)
  75
  76 nsPageFrame::nsPageFrame(nsStyleContext* aContext)
  77 : nsContainerFrame(aContext)
  78 {
  79 }
  80
  81 nsPageFrame::~nsPageFrame()
  82 {
  83 }
  84
  85 NS_IMETHODIMP nsPageFrame::Reflow(nsPresContext*           aPresContext,
  86                                   nsHTMLReflowMetrics&     aDesiredSize,
  87                                   const nsHTMLReflowState& aReflowState,
  88                                   nsReflowStatus&          aStatus)
  89 {
  90   DO_GLOBAL_REFLOW_COUNT("nsPageFrame");
  91   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  92   aStatus = NS_FRAME_COMPLETE;  // initialize out parameter
  93
  94   NS_ASSERTION(mFrames.FirstChild() &&
  95                nsGkAtoms::pageContentFrame == mFrames.FirstChild()->GetType(),
  96                "pageFrame must have a pageContentFrame child");
  97
  98   // Resize our frame allowing it only to be as big as we are
  99   // XXX Pay attention to the page's border and padding...
 100   if (mFrames.NotEmpty()) {
 101     nsIFrame* frame = mFrames.FirstChild();
 102     // When the reflow size is NS_UNCONSTRAINEDSIZE it means we are reflowing
 103     // a single page to print selection. So this means we want to use
 104     // NS_UNCONSTRAINEDSIZE without altering it
 105     nscoord avHeight;
 106     if (mPD->mReflowSize.height == NS_UNCONSTRAINEDSIZE) {
 107       avHeight = NS_UNCONSTRAINEDSIZE;
 108     } else {
 109       avHeight = mPD->mReflowSize.height - mPD->mReflowMargin.TopBottom();
 110     }
 111     nsSize  maxSize(mPD->mReflowSize.width - mPD->mReflowMargin.LeftRight(),
 112                     avHeight);
 113     float scale = aPresContext->GetPageScale();
 114     maxSize.width = NSToCoordCeil(maxSize.width / scale);
 115     if (maxSize.height != NS_UNCONSTRAINEDSIZE) {
 116       maxSize.height = NSToCoordCeil(maxSize.height / scale);
 117     }
 118     // Get the number of Twips per pixel from the PresContext
 119     nscoord onePixelInTwips = nsPresContext::CSSPixelsToAppUnits(1);
 120     // insurance against infinite reflow, when reflowing less than a pixel
 121     // XXX Shouldn't we do something more friendly when invalid margins
 122     //     are set?
 123     if (maxSize.width < onePixelInTwips || maxSize.height < onePixelInTwips) {
 124       aDesiredSize.width  = 0;
 125       aDesiredSize.height = 0;
 126       NS_WARNING("Reflow aborted; no space for content");
 127       return NS_OK;
 128     }
 129
 130     nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);
 131     kidReflowState.mFlags.mIsTopOfPage = PR_TRUE;
 132     kidReflowState.mFlags.mTableIsSplittable = PR_TRUE;
 133
 134     // calc location of frame
 135     nscoord xc = mPD->mReflowMargin.left + mPD->mExtraMargin.left;
 136     nscoord yc = mPD->mReflowMargin.top + mPD->mExtraMargin.top;
 137
 138     // Get the child's desired size
 139     ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, xc, yc, 0, aStatus);
 140
 141     // Place and size the child
 142     FinishReflowChild(frame, aPresContext, &kidReflowState, aDesiredSize, xc, yc, 0);
 143
 144     NS_ASSERTION(!NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||
 145                  !frame->GetNextInFlow(), "bad child flow list");
 146   }
 147   PR_PL(("PageFrame::Reflow %p ", this));
 148   PR_PL(("[%d,%d][%d,%d]\n", aDesiredSize.width, aDesiredSize.height, aReflowState.availableWidth, aReflowState.availableHeight));
 149
 150   // Return our desired size
 151   aDesiredSize.width = aReflowState.availableWidth;
 152   if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
 153     aDesiredSize.height = aReflowState.availableHeight;
 154   }
 155   PR_PL(("PageFrame::Reflow %p ", this));
 156   PR_PL(("[%d,%d]\n", aReflowState.availableWidth, aReflowState.availableHeight));
 157
 158   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
 159   return NS_OK;
 160 }
 161
 162 nsIAtom*
 163 nsPageFrame::GetType() const
 164 {
 165   return nsGkAtoms::pageFrame;
 166 }
 167
 168 #ifdef DEBUG
 169 NS_IMETHODIMP
 170 nsPageFrame::GetFrameName(nsAString& aResult) const
 171 {
 172   return MakeFrameName(NS_LITERAL_STRING("Page"), aResult);
 173 }
 174 #endif
 175
 176 /* virtual */ PRBool
 177 nsPageFrame::IsContainingBlock() const
 178 {
 179   return PR_TRUE;
 180 }
 181
 182 void
 183 nsPageFrame::ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr)
 184 {
 185
 186   aNewStr = aStr;
 187
 188   // Search to see if the &D code is in the string
 189   // then subst in the current date/time
 190   NS_NAMED_LITERAL_STRING(kDate, "&D");
 191   if (aStr.Find(kDate) != kNotFound) {
 192     if (mPD->mDateTimeStr != nsnull) {
 193       aNewStr.ReplaceSubstring(kDate.get(), mPD->mDateTimeStr);
 194     } else {
 195       aNewStr.ReplaceSubstring(kDate.get(), EmptyString().get());
 196     }
 197   }
 198
 199   // NOTE: Must search for &PT before searching for &P
 200   //
 201   // Search to see if the "page number and page" total code are in the string
 202   // and replace the page number and page total code with the actual
 203   // values
 204   NS_NAMED_LITERAL_STRING(kPageAndTotal, "&PT");
 205   if (aStr.Find(kPageAndTotal) != kNotFound) {
 206     PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumAndTotalsFormat, mPageNum, mTotNumPages);
 207     aNewStr.ReplaceSubstring(kPageAndTotal.get(), uStr);
 208     nsMemory::Free(uStr);
 209   }
 210
 211   // Search to see if the page number code is in the string
 212   // and replace the page number code with the actual value
 213   NS_NAMED_LITERAL_STRING(kPage, "&P");
 214   if (aStr.Find(kPage) != kNotFound) {
 215     PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mPageNum);
 216     aNewStr.ReplaceSubstring(kPage.get(), uStr);
 217     nsMemory::Free(uStr);
 218   }
 219
 220   NS_NAMED_LITERAL_STRING(kTitle, "&T");
 221   if (aStr.Find(kTitle) != kNotFound) {
 222     if (mPD->mDocTitle != nsnull) {
 223       aNewStr.ReplaceSubstring(kTitle.get(), mPD->mDocTitle);
 224     } else {
 225       aNewStr.ReplaceSubstring(kTitle.get(), EmptyString().get());
 226     }
 227   }
 228
 229   NS_NAMED_LITERAL_STRING(kDocURL, "&U");
 230   if (aStr.Find(kDocURL) != kNotFound) {
 231     if (mPD->mDocURL != nsnull) {
 232       aNewStr.ReplaceSubstring(kDocURL.get(), mPD->mDocURL);
 233     } else {
 234       aNewStr.ReplaceSubstring(kDocURL.get(), EmptyString().get());
 235     }
 236   }
 237
 238   NS_NAMED_LITERAL_STRING(kPageTotal, "&L");
 239   if (aStr.Find(kPageTotal) != kNotFound) {
 240     PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mTotNumPages);
 241     aNewStr.ReplaceSubstring(kPageTotal.get(), uStr);
 242     nsMemory::Free(uStr);
 243   }
 244 }
 245
 246
 247 //------------------------------------------------------------------------------
 248 nscoord nsPageFrame::GetXPosition(nsIRenderingContext& aRenderingContext,
 249                                   const nsRect&        aRect,
 250                                   PRInt32              aJust,
 251                                   const nsString&      aStr)
 252 {
 253   nscoord width = nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
 254                                                 aStr.get(), aStr.Length());
 255
 256   nscoord x = aRect.x;
 257   switch (aJust) {
 258     case nsIPrintSettings::kJustLeft:
 259       x += mPD->mExtraMargin.left + mPD->mEdgePaperMargin.left;
 260       break;
 261
 262     case nsIPrintSettings::kJustCenter:
 263       x += (aRect.width - width) / 2;
 264       break;
 265
 266     case nsIPrintSettings::kJustRight:
 267       x += aRect.width - width - mPD->mExtraMargin.right - mPD->mEdgePaperMargin.right;
 268       break;
 269   } // switch
 270
 271   return x;
 272 }
 273
 274 // Draw a header or footer
 275 // @param aRenderingContext - rendering content ot draw into
 276 // @param aHeaderFooter - indicates whether it is a header or footer
 277 // @param aStrLeft - string for the left header or footer; can be empty
 278 // @param aStrCenter - string for the center header or footer; can be empty
 279 // @param aStrRight - string for the right header or footer; can be empty
 280 // @param aRect - the rect of the page
 281 // @param aAscent - the ascent of the font
 282 // @param aHeight - the height of the font
 283 void
 284 nsPageFrame::DrawHeaderFooter(nsIRenderingContext& aRenderingContext,
 285                               nsHeaderFooterEnum   aHeaderFooter,
 286                               const nsString&      aStrLeft,
 287                               const nsString&      aStrCenter,
 288                               const nsString&      aStrRight,
 289                               const nsRect&        aRect,
 290                               nscoord              aAscent,
 291                               nscoord              aHeight)
 292 {
 293   PRInt32 numStrs = 0;
 294   if (!aStrLeft.IsEmpty()) numStrs++;
 295   if (!aStrCenter.IsEmpty()) numStrs++;
 296   if (!aStrRight.IsEmpty()) numStrs++;
 297
 298   if (numStrs == 0) return;
 299   nscoord strSpace = aRect.width / numStrs;
 300
 301   if (!aStrLeft.IsEmpty()) {
 302     DrawHeaderFooter(aRenderingContext, aHeaderFooter,
 303                      nsIPrintSettings::kJustLeft, aStrLeft, aRect, aAscent,
 304                      aHeight, strSpace);
 305   }
 306   if (!aStrCenter.IsEmpty()) {
 307     DrawHeaderFooter(aRenderingContext, aHeaderFooter,
 308                      nsIPrintSettings::kJustCenter, aStrCenter, aRect, aAscent,
 309                      aHeight, strSpace);
 310   }
 311   if (!aStrRight.IsEmpty()) {
 312     DrawHeaderFooter(aRenderingContext, aHeaderFooter,
 313                      nsIPrintSettings::kJustRight, aStrRight, aRect, aAscent,
 314                      aHeight, strSpace);
 315   }
 316 }
 317
 318 // Draw a header or footer string
 319 // @param aRenderingContext - rendering context to draw into
 320 // @param aHeaderFooter - indicates whether it is a header or footer
 321 // @param aJust - indicates where the string is located within the header/footer
 322 // @param aStr - the string to be drawn
 323 // @param aRect - the rect of the page
 324 // @param aHeight - the height of the font
 325 // @param aAscent - the ascent of the font
 326 // @param aWidth - available width for the string
 327 void
 328 nsPageFrame::DrawHeaderFooter(nsIRenderingContext& aRenderingContext,
 329                               nsHeaderFooterEnum   aHeaderFooter,
 330                               PRInt32              aJust,
 331                               const nsString&      aStr,
 332                               const nsRect&        aRect,
 333                               nscoord              aAscent,
 334                               nscoord              aHeight,
 335                               nscoord              aWidth)
 336 {
 337
 338   nscoord contentWidth = aWidth - (mPD->mEdgePaperMargin.left + mPD->mEdgePaperMargin.right);
 339
 340   if ((aHeaderFooter == eHeader && aHeight < mPD->mReflowMargin.top) ||
 341       (aHeaderFooter == eFooter && aHeight < mPD->mReflowMargin.bottom)) {
 342     nsAutoString str;
 343     ProcessSpecialCodes(aStr, str);
 344
 345     PRInt32 indx;
 346     PRInt32 textWidth = 0;
 347     const PRUnichar* text = str.get();
 348
 349     PRInt32 len = (PRInt32)str.Length();
 350     if (len == 0) {
 351       return; // bail is empty string
 352     }
 353     // find how much text fits, the "position" is the size of the available area
 354     if (nsLayoutUtils::BinarySearchForPosition(&aRenderingContext, text, 0, 0, 0, len,
 355                                 PRInt32(contentWidth), indx, textWidth)) {
 356       if (indx < len-1 ) {
 357         // we can't fit in all the text
 358         if (indx > 3) {
 359           // But we can fit in at least 4 chars.  Show all but 3 of them, then
 360           // an ellipsis.
 361           // XXXbz for non-plane0 text, this may be cutting things in the
 362           // middle of a codepoint!  Also, we have no guarantees that the three
 363           // dots will fit in the space the three chars we removed took up with
 364           // these font metrics!
 365           str.Truncate(indx-3);
 366           str.AppendLiteral("...");
 367         } else {
 368           // We can only fit 3 or fewer chars.  Just show nothing
 369           str.Truncate();
 370         }
 371       }
 372     } else {
 373       return; // bail if couldn't find the correct length
 374     }
 375
 376     if (HasRTLChars(str)) {
 377       PresContext()->SetBidiEnabled();
 378     }
 379
 380     // cacl the x and y positions of the text
 381     nscoord x = GetXPosition(aRenderingContext, aRect, aJust, str);
 382     nscoord y;
 383     if (aHeaderFooter == eHeader) {
 384       y = aRect.y + mPD->mExtraMargin.top + mPD->mEdgePaperMargin.top;
 385     } else {
 386       y = aRect.YMost() - aHeight - mPD->mExtraMargin.bottom - mPD->mEdgePaperMargin.bottom;
 387     }
 388
 389     // set up new clip and draw the text
 390     aRenderingContext.PushState();
 391     aRenderingContext.SetColor(NS_RGB(0,0,0));
 392     aRenderingContext.SetClipRect(aRect, nsClipCombine_kIntersect);
 393     nsLayoutUtils::DrawString(this, &aRenderingContext, str.get(), str.Length(), nsPoint(x, y + aAscent));
 394     aRenderingContext.PopState();
 395   }
 396 }
 397
 398 static void PaintPrintPreviewBackground(nsIFrame* aFrame, nsIRenderingContext* aCtx,
 399                                         const nsRect& aDirtyRect, nsPoint aPt)
 400 {
 401   static_cast<nsPageFrame*>(aFrame)->PaintPrintPreviewBackground(*aCtx, aPt);
 402 }
 403
 404 static void PaintPageContent(nsIFrame* aFrame, nsIRenderingContext* aCtx,
 405                              const nsRect& aDirtyRect, nsPoint aPt)
 406 {
 407   static_cast<nsPageFrame*>(aFrame)->PaintPageContent(*aCtx, aDirtyRect, aPt);
 408 }
 409
 410 static void PaintHeaderFooter(nsIFrame* aFrame, nsIRenderingContext* aCtx,
 411                               const nsRect& aDirtyRect, nsPoint aPt)
 412 {
 413   static_cast<nsPageFrame*>(aFrame)->PaintHeaderFooter(*aCtx, aPt);
 414 }
 415
 416 //------------------------------------------------------------------------------
 417 NS_IMETHODIMP
 418 nsPageFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
 419                               const nsRect&           aDirtyRect,
 420                               const nsDisplayListSet& aLists)
 421 {
 422   nsDisplayListCollection set;
 423   nsresult rv;
 424
 425   if (PresContext()->IsScreen()) {
 426     rv = set.BorderBackground()->AppendNewToTop(new (aBuilder)
 427         nsDisplayGeneric(this, ::PaintPrintPreviewBackground, "PrintPreviewBackground",
 428                          nsDisplayItem::TYPE_PRINT_PREVIEW_BACKGROUND));
 429     NS_ENSURE_SUCCESS(rv, rv);
 430   }
 431
 432   rv = set.BorderBackground()->AppendNewToTop(new (aBuilder)
 433         nsDisplayGeneric(this, ::PaintPageContent, "PageContent",
 434                          nsDisplayItem::TYPE_PAGE_CONTENT));
 435   NS_ENSURE_SUCCESS(rv, rv);
 436
 437   if (PresContext()->IsRootPaginatedDocument()) {
 438     rv = set.Content()->AppendNewToTop(new (aBuilder)
 439         nsDisplayGeneric(this, ::PaintHeaderFooter, "HeaderFooter",
 440                          nsDisplayItem::TYPE_HEADER_FOOTER));
 441     NS_ENSURE_SUCCESS(rv, rv);
 442   }
 443
 444   set.MoveTo(aLists);
 445   return NS_OK;
 446 }
 447
 448 //------------------------------------------------------------------------------
 449 void
 450 nsPageFrame::SetPageNumInfo(PRInt32 aPageNumber, PRInt32 aTotalPages)
 451 {
 452   mPageNum     = aPageNumber;
 453   mTotNumPages = aTotalPages;
 454 }
 455
 456
 457 void
 458 nsPageFrame::PaintPrintPreviewBackground(nsIRenderingContext& aRenderingContext,
 459                                          nsPoint aPt)
 460 {
 461   // fill page with White
 462   aRenderingContext.SetColor(NS_RGB(255,255,255));
 463   // REVIEW: this used to have rect's width and height be the
 464   // mClipRect if specialClipIsSet ... but that seems completely bogus
 465   // and inconsistent with the painting of the shadow below
 466   nsRect rect(aPt, GetSize());
 467   rect.width  -= mPD->mShadowSize.width;
 468   rect.height -= mPD->mShadowSize.height;
 469   aRenderingContext.FillRect(rect);
 470   // draw line around outside of page
 471   aRenderingContext.SetColor(NS_RGB(0,0,0));
 472   aRenderingContext.DrawRect(rect);
 473
 474   if (mPD->mShadowSize.width > 0 && mPD->mShadowSize.height > 0) {
 475     aRenderingContext.SetColor(NS_RGB(51,51,51));
 476     nsRect r(aPt.x,aPt.y, mRect.width, mRect.height);
 477     nsRect shadowRect;
 478     shadowRect.x = r.x + r.width - mPD->mShadowSize.width;
 479     shadowRect.y = r.y + mPD->mShadowSize.height;
 480     shadowRect.width  = mPD->mShadowSize.width;
 481     shadowRect.height = r.height - mPD->mShadowSize.height;
 482     aRenderingContext.FillRect(shadowRect);
 483
 484     shadowRect.x = r.x + mPD->mShadowSize.width;
 485     shadowRect.y = r.y + r.height - mPD->mShadowSize.height;
 486     shadowRect.width  = r.width - mPD->mShadowSize.width;
 487     shadowRect.height = mPD->mShadowSize.height;
 488     aRenderingContext.FillRect(shadowRect);
 489   }
 490 }
 491
 492 void
 493 nsPageFrame::PaintHeaderFooter(nsIRenderingContext& aRenderingContext,
 494                                nsPoint aPt)
 495 {
 496   nsPresContext* pc = PresContext();
 497
 498   if (!mPD->mPrintSettings) {
 499     if (pc->Type() == nsPresContext::eContext_PrintPreview || pc->IsDynamic())
 500       mPD->mPrintSettings = pc->GetPrintSettings();
 501     if (!mPD->mPrintSettings)
 502       return;
 503   }
 504
 505   nsRect rect(aPt.x, aPt.y, mRect.width - mPD->mShadowSize.width,
 506               mRect.height - mPD->mShadowSize.height);
 507
 508   aRenderingContext.SetColor(NS_RGB(0,0,0));
 509
 510   // Get the FontMetrics to determine width.height of strings
 511   nsCOMPtr<nsIFontMetrics> fontMet;
 512   pc->DeviceContext()->GetMetricsFor(*mPD->mHeadFootFont,
 513                                      pc->GetUserFontSet(),
 514                                      *getter_AddRefs(fontMet));
 515
 516   aRenderingContext.SetFont(fontMet);
 517
 518   nscoord ascent = 0;
 519   nscoord visibleHeight = 0;
 520   if (fontMet) {
 521     fontMet->GetHeight(visibleHeight);
 522     fontMet->GetMaxAscent(ascent);
 523   }
 524
 525   // print document headers and footers
 526   nsXPIDLString headerLeft, headerCenter, headerRight;
 527   mPD->mPrintSettings->GetHeaderStrLeft(getter_Copies(headerLeft));
 528   mPD->mPrintSettings->GetHeaderStrCenter(getter_Copies(headerCenter));
 529   mPD->mPrintSettings->GetHeaderStrRight(getter_Copies(headerRight));
 530   DrawHeaderFooter(aRenderingContext, eHeader,
 531                    headerLeft, headerCenter, headerRight,
 532                    rect, ascent, visibleHeight);
 533
 534   nsXPIDLString footerLeft, footerCenter, footerRight;
 535   mPD->mPrintSettings->GetFooterStrLeft(getter_Copies(footerLeft));
 536   mPD->mPrintSettings->GetFooterStrCenter(getter_Copies(footerCenter));
 537   mPD->mPrintSettings->GetFooterStrRight(getter_Copies(footerRight));
 538   DrawHeaderFooter(aRenderingContext, eFooter,
 539                    footerLeft, footerCenter, footerRight,
 540                    rect, ascent, visibleHeight);
 541 }
 542
 543 //------------------------------------------------------------------------------
 544 void
 545 nsPageFrame::PaintPageContent(nsIRenderingContext& aRenderingContext,
 546                               const nsRect&        aDirtyRect,
 547                               nsPoint              aPt) {
 548   nsIFrame* pageContentFrame  = mFrames.FirstChild();
 549   nsRect rect = aDirtyRect;
 550   float scale = PresContext()->GetPageScale();
 551   aRenderingContext.PushState();
 552   nsPoint framePos = aPt + pageContentFrame->GetOffsetTo(this);
 553   aRenderingContext.Translate(framePos.x, framePos.y);
 554   // aPt translates to coords relative to this, then margins translate to
 555   // pageContentFrame's coords
 556   rect -= framePos;
 557   aRenderingContext.Scale(scale, scale);
 558   rect.ScaleRoundOut(1.0f / scale);
 559   // Make sure we don't draw where we aren't supposed to draw, especially
 560   // when printing selection
 561   nsRect clipRect(nsPoint(0, 0), pageContentFrame->GetSize());
 562   // Note: this computation matches how we compute maxSize.height
 563   // in nsPageFrame::Reflow
 564   nscoord expectedPageContentHeight =
 565     NSToCoordCeil((GetSize().height - mPD->mReflowMargin.TopBottom()) / scale);
 566   if (clipRect.height > expectedPageContentHeight) {
 567     // We're doing print-selection, with one long page-content frame.
 568     // Clip to the appropriate page-content slice for the current page.
 569     NS_ASSERTION(mPageNum > 0, "page num should be positive");
 570     // Note: The pageContentFrame's y-position has been set such that a zero
 571     // y-value matches the top edge of the current page.  So, to clip to the
 572     // current page's content (in coordinates *relative* to the page content
 573     // frame), we just negate its y-position and add the top margin.
 574     clipRect.y = NSToCoordCeil((-pageContentFrame->GetRect().y +
 575                                 mPD->mReflowMargin.top) / scale);
 576     clipRect.height = expectedPageContentHeight;
 577     NS_ASSERTION(clipRect.y < pageContentFrame->GetSize().height,
 578                  "Should be clipping to region inside the page content bounds");
 579   }
 580   aRenderingContext.SetClipRect(clipRect, nsClipCombine_kIntersect);
 581
 582   nsRect backgroundRect = nsRect(nsPoint(0, 0), pageContentFrame->GetSize());
 583   nsCSSRendering::PaintBackground(PresContext(), aRenderingContext, this,
 584                                   rect, backgroundRect,
 585                                   nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES);
 586
 587   nsLayoutUtils::PaintFrame(&aRenderingContext, pageContentFrame,
 588                             nsRegion(rect), NS_RGBA(0,0,0,0),
 589                             nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES);
 590
 591   aRenderingContext.PopState();
 592 }
 593
 594 void
 595 nsPageFrame::SetSharedPageData(nsSharedPageData* aPD)
 596 {
 597   mPD = aPD;
 598   // Set the shared data into the page frame before reflow
 599   nsPageContentFrame * pcf = static_cast<nsPageContentFrame*>(mFrames.FirstChild());
 600   if (pcf) {
 601     pcf->SetSharedPageData(mPD);
 602   }
 603
 604 }
 605
 606 nsIFrame*
 607 NS_NewPageBreakFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 608 {
 609   NS_PRECONDITION(aPresShell, "null PresShell");
 610   //check that we are only creating page break frames when printing
 611   NS_ASSERTION(aPresShell->GetPresContext()->IsPaginated(), "created a page break frame while not printing");
 612
 613   return new (aPresShell) nsPageBreakFrame(aContext);
 614 }
 615
 616 NS_IMPL_FRAMEARENA_HELPERS(nsPageBreakFrame)
 617
 618 nsPageBreakFrame::nsPageBreakFrame(nsStyleContext* aContext) :
 619   nsLeafFrame(aContext), mHaveReflowed(PR_FALSE)
 620 {
 621 }
 622
 623 nsPageBreakFrame::~nsPageBreakFrame()
 624 {
 625 }
 626
 627 nscoord
 628 nsPageBreakFrame::GetIntrinsicWidth()
 629 {
 630   return nsPresContext::CSSPixelsToAppUnits(1);
 631 }
 632
 633 nscoord
 634 nsPageBreakFrame::GetIntrinsicHeight()
 635 {
 636   return 0;
 637 }
 638
 639 nsresult
 640 nsPageBreakFrame::Reflow(nsPresContext*           aPresContext,
 641                          nsHTMLReflowMetrics&     aDesiredSize,
 642                          const nsHTMLReflowState& aReflowState,
 643                          nsReflowStatus&          aStatus)
 644 {
 645   DO_GLOBAL_REFLOW_COUNT("nsPageBreakFrame");
 646   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
 647
 648   // Override reflow, since we don't want to deal with what our
 649   // computed values are.
 650   aDesiredSize.width = GetIntrinsicWidth();
 651   aDesiredSize.height = (aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE ?
 652                          0 : aReflowState.availableHeight);
 653   // round the height down to the nearest pixel
 654   aDesiredSize.height -=
 655     aDesiredSize.height % nsPresContext::CSSPixelsToAppUnits(1);
 656
 657   // Note: not using NS_FRAME_FIRST_REFLOW here, since it's not clear whether
 658   // DidReflow will always get called before the next Reflow() call.
 659   mHaveReflowed = PR_TRUE;
 660   aStatus = NS_FRAME_COMPLETE;
 661   return NS_OK;
 662 }
 663
 664 nsIAtom*
 665 nsPageBreakFrame::GetType() const
 666 {
 667   return nsGkAtoms::pageBreakFrame;
 668 }
 669
 670 #ifdef DEBUG
 671 NS_IMETHODIMP
 672 nsPageBreakFrame::GetFrameName(nsAString& aResult) const
 673 {
 674   return MakeFrameName(NS_LITERAL_STRING("PageBreak"), aResult);
 675 }
 676 #endif