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nsLineLayout Class Reference

#include <nsLineLayout.h>

Collaboration diagram for nsLineLayout:
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List of all members.

Classes

class  ArenaDeque
struct  FrameJustificationState
struct  PerFrameData
struct  PerSpanData
union  PerSpanData.__unnamed__

Public Member Functions

 nsLineLayout (nsPresContext *aPresContext, nsSpaceManager *aSpaceManager, const nsHTMLReflowState *aOuterReflowState, PRBool aComputeMaxElementWidth)
 ~nsLineLayout ()
void Init (nsBlockReflowState *aState, nscoord aMinLineHeight, PRInt32 aLineNumber)
PRInt32 GetColumn ()
void SetColumn (PRInt32 aNewColumn)
PRInt32 GetLineNumber () const
void BeginLineReflow (nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight, PRBool aImpactedByFloats, PRBool aIsTopOfPage)
void EndLineReflow ()
void UpdateBand (nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight, PRBool aPlacedLeftFloat, nsIFrame *aFloatFrame)
nsresult BeginSpan (nsIFrame *aFrame, const nsHTMLReflowState *aSpanReflowState, nscoord aLeftEdge, nscoord aRightEdge)
void EndSpan (nsIFrame *aFrame, nsSize &aSizeResult, nscoord *aMaxElementWidth)
PRInt32 GetCurrentSpanCount () const
void SplitLineTo (PRInt32 aNewCount)
PRBool IsZeroHeight ()
nsresult ReflowFrame (nsIFrame *aFrame, nsReflowStatus &aReflowStatus, nsHTMLReflowMetrics *aMetrics, PRBool &aPushedFrame)
nsresult AddBulletFrame (nsIFrame *aFrame, const nsHTMLReflowMetrics &aMetrics)
void RemoveBulletFrame (nsIFrame *aFrame)
void VerticalAlignLine (nsLineBox *aLineBox, nscoord *aMaxElementWidthResult)
PRBool TrimTrailingWhiteSpace ()
PRBool HorizontalAlignFrames (nsRect &aLineBounds, PRBool aAllowJustify, PRBool aShrinkWrapWidth)
void RelativePositionFrames (nsRect &aCombinedArea)
 Handle all the relative positioning in the line, compute the combined area (== overflow area) for the line, and handle view sizing/positioning and the setting of NS_FRAME_OUTSIDE_CHILDREN.
void SetEndsInWhiteSpace (PRBool aState)
PRBool GetEndsInWhiteSpace () const
void SetUnderstandsWhiteSpace (PRBool aSetting)
void SetTextJustificationWeights (PRInt32 aNumSpaces, PRInt32 aNumLetters)
void RecordWordFrame (nsIFrame *aWordFrame)
PRBool InWord () const
void ForgetWordFrame (nsIFrame *aFrame)
void ForgetWordFrames ()
nsIFrameFindNextText (nsPresContext *aPresContext, nsIFrame *aFrame)
PRBool CanPlaceFloatNow () const
PRBool LineIsBreakable () const
PRBool GetLineEndsInBR () const
void SetLineEndsInBR (PRBool aOn)
PRBool InStrictMode () const
nsCompatibility GetCompatMode () const
PRBool InitFloat (nsPlaceholderFrame *aFrame, nsReflowStatus &aReflowStatus)
PRBool AddFloat (nsPlaceholderFrame *aFrame, nsReflowStatus &aReflowStatus)
PRBool GetFirstLetterStyleOK () const
void SetFirstLetterStyleOK (PRBool aSetting)
void SetFirstLetterFrame (nsIFrame *aFrame)
nsIFrameGetLineContainerFrame () const

Static Public Member Functions

static PRBool TreatFrameAsBlock (nsIFrame *aFrame)
static PRBool IsPercentageUnitSides (const nsStyleSides *aSides)
static PRBool IsPercentageAwareReplacedElement (nsPresContext *aPresContext, nsIFrame *aFrame)

Public Attributes

nsPresContextmPresContext

Protected Member Functions

void SetFlag (PRUint32 aFlag, PRBool aValue)
PRBool GetFlag (PRUint32 aFlag) const
PRBool AllocateDeque ()
nsresult NewPerFrameData (PerFrameData **aResult)
nsresult NewPerSpanData (PerSpanData **aResult)
void FreeSpan (PerSpanData *psd)
PRBool InBlockContext () const
void PushFrame (nsIFrame *aFrame)
void ApplyStartMargin (PerFrameData *pfd, nsHTMLReflowState &aReflowState)
PRBool CanPlaceFrame (PerFrameData *pfd, const nsHTMLReflowState &aReflowState, PRBool aNotSafeToBreak, nsHTMLReflowMetrics &aMetrics, nsReflowStatus &aStatus)
 See if the frame can be placed now that we know it's desired size.
void PlaceFrame (PerFrameData *pfd, nsHTMLReflowMetrics &aMetrics)
 Place the frame.
void UpdateFrames ()
void VerticalAlignFrames (PerSpanData *psd)
void PlaceTopBottomFrames (PerSpanData *psd, nscoord aDistanceFromTop, nscoord aLineHeight)
void RelativePositionFrames (PerSpanData *psd, nsRect &aCombinedArea)
PRBool TrimTrailingWhiteSpaceIn (PerSpanData *psd, nscoord *aDeltaWidth)
void ComputeJustificationWeights (PerSpanData *psd, PRInt32 *numSpaces, PRInt32 *numLetters)
nscoord ApplyFrameJustification (PerSpanData *aPSD, FrameJustificationState *aState)

Protected Attributes

PRUint16 mFlags
nsSpaceManagermSpaceManager
const nsStyleTextmStyleText
const nsHTMLReflowStatemBlockReflowState
nsBlockReflowStatemBlockRS
nsCompatibility mCompatMode
nscoord mMinLineHeight
PRPackedBool mComputeMaxElementWidth
PRUint8 mTextAlign
PRUint8 mPlacedFloats
nscoord mTextIndent
nsIFramemFirstLetterFrame
PRInt32 mLineNumber
PRInt32 mColumn
PRInt32 mTextJustificationNumSpaces
PRInt32 mTextJustificationNumLetters
nsLineBoxmLineBox
PRInt32 mTotalPlacedFrames
ArenaDequemWordFrames
nscoord mTopEdge
nscoord mMaxTopBoxHeight
nscoord mMaxBottomBoxHeight
nscoord mFinalLineHeight
PerFrameDatamFrameFreeList
PerSpanDatamSpanFreeList
PerSpanDatamRootSpan
PerSpanDatamCurrentSpan
PRInt32 mSpanDepth
PLArenaPool mArena

Friends

class nsInlineFrame
struct PerSpanData
struct PerFrameData

Detailed Description

Definition at line 60 of file nsLineLayout.h.


Class Documentation

struct nsLineLayout::FrameJustificationState

Definition at line 503 of file nsLineLayout.h.

Class Members
PRInt32 mNumLettersProcessed
PRInt32 mNumSpacesProcessed
PRInt32 mTotalNumLetters
PRInt32 mTotalNumSpaces
nscoord mTotalWidthForLetters
nscoord mTotalWidthForSpaces
nscoord mWidthForLettersProcessed
nscoord mWidthForSpacesProcessed
union nsLineLayout::PerSpanData.__unnamed__

Definition at line 420 of file nsLineLayout.h.

Class Members
PerSpanData * mNextFreeSpan
PerSpanData * mParent

Constructor & Destructor Documentation

nsLineLayout::nsLineLayout ( nsPresContext aPresContext,
nsSpaceManager aSpaceManager,
const nsHTMLReflowState aOuterReflowState,
PRBool  aComputeMaxElementWidth 
)

Definition at line 152 of file nsLineLayout.cpp.

  : mPresContext(aPresContext),
    mSpaceManager(aSpaceManager),
    mBlockReflowState(aOuterReflowState),
    mBlockRS(nsnull),/* XXX temporary */
    mMinLineHeight(0),
    mComputeMaxElementWidth(aComputeMaxElementWidth),
    mTextIndent(0),
    mWordFrames(0)
{
  MOZ_COUNT_CTOR(nsLineLayout);

  // Stash away some style data that we need
  mStyleText = aOuterReflowState->frame->GetStyleText();
  mTextAlign = mStyleText->mTextAlign;
  mLineNumber = 0;
  mColumn = 0;
  mFlags = 0; // default all flags to false except those that follow here...
  SetFlag(LL_ENDSINWHITESPACE, PR_TRUE);
  mPlacedFloats = 0;
  mTotalPlacedFrames = 0;
  mTopEdge = 0;

  // Instead of always pre-initializing the free-lists for frames and
  // spans, we do it on demand so that situations that only use a few
  // frames and spans won't waste alot of time in unneeded
  // initialization.
  PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024);
  mFrameFreeList = nsnull;
  mSpanFreeList = nsnull;

  mCurrentSpan = mRootSpan = nsnull;
  mSpanDepth = 0;

  mCompatMode = mPresContext->CompatibilityMode();
}

Definition at line 192 of file nsLineLayout.cpp.

{
  MOZ_COUNT_DTOR(nsLineLayout);

  NS_ASSERTION(nsnull == mRootSpan, "bad line-layout user");

  delete mWordFrames; // operator delete for this class just returns

  // PL_FreeArenaPool takes our memory and puts in on a global free list so
  // that the next time an arena makes an allocation it will not have to go
  // all the way down to malloc.  This is desirable as this class is created
  // and destroyed in a tight loop.
  //
  // I looked at the code.  It is not technically necessary to call
  // PL_FinishArenaPool() after PL_FreeArenaPool(), but from an API
  // standpoint, I think we are susposed to.  It will be very fast anyway,
  // since PL_FreeArenaPool() has done all the work.
  PL_FreeArenaPool(&mArena);
  PL_FinishArenaPool(&mArena);
}

Member Function Documentation

Definition at line 1495 of file nsLineLayout.cpp.

{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");

  PerFrameData* pfd;
  nsresult rv = NewPerFrameData(&pfd);
  if (NS_SUCCEEDED(rv)) {
    mRootSpan->AppendFrame(pfd);
    pfd->mFrame = aFrame;
    pfd->mMargin.SizeTo(0, 0, 0, 0);
    pfd->mBorderPadding.SizeTo(0, 0, 0, 0);
    pfd->mFrameType = NS_CSS_FRAME_TYPE_INLINE|NS_FRAME_REPLACED_ELEMENT;
    pfd->mFlags = 0;  // all flags default to false
    pfd->SetFlag(PFD_ISBULLET, PR_TRUE);
    pfd->mAscent = aMetrics.ascent;
    pfd->mDescent = aMetrics.descent;

    // Note: y value will be updated during vertical alignment
    pfd->mBounds = aFrame->GetRect();
    pfd->mCombinedArea = aMetrics.mOverflowArea;
    if (mComputeMaxElementWidth) {
      pfd->mMaxElementWidth = aMetrics.width;
    }
  }
  return rv;
}

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PRBool nsLineLayout::AddFloat ( nsPlaceholderFrame aFrame,
nsReflowStatus aReflowStatus 
) [inline]

Definition at line 259 of file nsLineLayout.h.

                                                                             {
    return mBlockRS->AddFloat(*this, aFrame, PR_FALSE, aReflowStatus);
  }

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Definition at line 222 of file nsLineLayout.cpp.

{
  mWordFrames = new(mArena) ArenaDeque;

  return mWordFrames != nsnull;
}

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Definition at line 2723 of file nsLineLayout.cpp.

{
  NS_ASSERTION(aPSD, "null arg");
  NS_ASSERTION(aState, "null arg");

  nscoord deltaX = 0;
  for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nsnull; pfd = pfd->mNext) {
    // Don't reposition bullets (and other frames that occur out of X-order?)
    if (!pfd->GetFlag(PFD_ISBULLET)) {
      nscoord dw = 0;
      
      pfd->mBounds.x += deltaX;
      
      if (PR_TRUE == pfd->GetFlag(PFD_ISTEXTFRAME)) {
        if (aState->mTotalWidthForSpaces > 0 &&
            aState->mTotalNumSpaces > 0) {
          aState->mNumSpacesProcessed += pfd->mJustificationNumSpaces;

          nscoord newAllocatedWidthForSpaces =
            (aState->mTotalWidthForSpaces*aState->mNumSpacesProcessed)
              /aState->mTotalNumSpaces;
          
          dw += newAllocatedWidthForSpaces - aState->mWidthForSpacesProcessed;

          aState->mWidthForSpacesProcessed = newAllocatedWidthForSpaces;
        }

        if (aState->mTotalWidthForLetters > 0 &&
            aState->mTotalNumLetters > 0) {
          aState->mNumLettersProcessed += pfd->mJustificationNumLetters;

          nscoord newAllocatedWidthForLetters =
            (aState->mTotalWidthForLetters*aState->mNumLettersProcessed)
              /aState->mTotalNumLetters;
          
          dw += newAllocatedWidthForLetters - aState->mWidthForLettersProcessed;

          aState->mWidthForLettersProcessed = newAllocatedWidthForLetters;
        }
      }
      else {
        if (nsnull != pfd->mSpan) {
          dw += ApplyFrameJustification(pfd->mSpan, aState);
        }
      }
      
      pfd->mBounds.width += dw;

      deltaX += dw;
      pfd->mFrame->SetRect(pfd->mBounds);
    }
  }
  return deltaX;
}

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void nsLineLayout::ApplyStartMargin ( PerFrameData pfd,
nsHTMLReflowState aReflowState 
) [protected]

Definition at line 1219 of file nsLineLayout.cpp.

{
  NS_ASSERTION(aReflowState.mStyleDisplay->mFloats == NS_STYLE_FLOAT_NONE,
               "How'd we get a floated inline frame? "
               "The frame ctor should've dealt with this.");

  // XXXwaterson probably not the right way to get this; e.g., embeddings, etc.
  PRBool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);

  // Only apply start-margin on the first-in flow for inline frames
  if (HasPrevInFlow(pfd->mFrame)) {
    // Zero this out so that when we compute the max-element-width of
    // the frame we will properly avoid adding in the starting margin.
    if (ltr)
      pfd->mMargin.left = 0;
    else
      pfd->mMargin.right = 0;
  }

  if (NS_UNCONSTRAINEDSIZE != aReflowState.availableWidth){
    // Adjust available width to account for the left margin. The
    // right margin will be accounted for when we finish flowing the
    // frame.
    aReflowState.availableWidth -= ltr ? pfd->mMargin.left : pfd->mMargin.right;
  }

  if (ltr)
    pfd->mBounds.x += pfd->mMargin.left;
}

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void nsLineLayout::BeginLineReflow ( nscoord  aX,
nscoord  aY,
nscoord  aWidth,
nscoord  aHeight,
PRBool  aImpactedByFloats,
PRBool  aIsTopOfPage 
)

Definition at line 239 of file nsLineLayout.cpp.

{
  NS_ASSERTION(nsnull == mRootSpan, "bad linelayout user");
#ifdef DEBUG
  if ((aWidth != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aWidth)) {
    NS_NOTREACHED("bad width");
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": Init: bad caller: width WAS %d(0x%x)\n",
           aWidth, aWidth);
  }
  if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
    NS_NOTREACHED("bad height");
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": Init: bad caller: height WAS %d(0x%x)\n",
           aHeight, aHeight);
  }
#endif
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowState->frame);
  printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n",
         aX, aY, aWidth, aHeight,
         aImpactedByFloats?"true":"false",
         aIsTopOfPage ? "top-of-page" : "");
#endif
#ifdef DEBUG
  mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
#endif

  mColumn = 0;
  
  SetFlag(LL_ENDSINWHITESPACE, PR_TRUE);
  SetFlag(LL_UNDERSTANDSNWHITESPACE, PR_FALSE);
  SetFlag(LL_FIRSTLETTERSTYLEOK, PR_FALSE);
  SetFlag(LL_ISTOPOFPAGE, aIsTopOfPage);
  SetFlag(LL_UPDATEDBAND, PR_FALSE);
  mPlacedFloats = 0;
  SetFlag(LL_IMPACTEDBYFLOATS, aImpactedByFloats);
  mTotalPlacedFrames = 0;
  SetFlag(LL_CANPLACEFLOAT, PR_TRUE);
  SetFlag(LL_LINEENDSINBR, PR_FALSE);
  mSpanDepth = 0;
  mMaxTopBoxHeight = mMaxBottomBoxHeight = 0;

  ForgetWordFrames();

  PerSpanData* psd;
  NewPerSpanData(&psd);
  mCurrentSpan = mRootSpan = psd;
  psd->mReflowState = mBlockReflowState;
  psd->mLeftEdge = aX;
  psd->mX = aX;
  if (NS_UNCONSTRAINEDSIZE == aWidth) {
    psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
  }
  else {
    psd->mRightEdge = aX + aWidth;
  }

  mTopEdge = aY;

  switch (mStyleText->mWhiteSpace) {
  case NS_STYLE_WHITESPACE_PRE:
  case NS_STYLE_WHITESPACE_NOWRAP:
    psd->mNoWrap = PR_TRUE;
    break;
  default:
    psd->mNoWrap = PR_FALSE;
    break;
  }
  psd->mDirection = mBlockReflowState->mStyleVisibility->mDirection;
  psd->mChangedFrameDirection = PR_FALSE;

  // If this is the first line of a block then see if the text-indent
  // property amounts to anything.
  
  if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowState->frame)) {
    nscoord indent = 0;
    nsStyleUnit unit = mStyleText->mTextIndent.GetUnit();
    if (eStyleUnit_Coord == unit) {
      indent = mStyleText->mTextIndent.GetCoordValue();
    }
    else if (eStyleUnit_Percent == unit) {
      nscoord width =
        nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState);
      if ((0 != width) && (NS_UNCONSTRAINEDSIZE != width)) {
        indent = nscoord(mStyleText->mTextIndent.GetPercentValue() * width);
      }
    }

    mTextIndent = indent;

    if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
      if (NS_UNCONSTRAINEDSIZE != psd->mRightEdge) {
        psd->mRightEdge -= indent;
      }
    }
    else {
      psd->mX += indent;
    }
  }
}

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nsresult nsLineLayout::BeginSpan ( nsIFrame aFrame,
const nsHTMLReflowState aSpanReflowState,
nscoord  aLeftEdge,
nscoord  aRightEdge 
)

Definition at line 505 of file nsLineLayout.cpp.

{
#ifdef NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth+1);
  nsFrame::ListTag(stdout, aFrame);
  printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aLeftEdge, aRightEdge);
#endif

  PerSpanData* psd;
  nsresult rv = NewPerSpanData(&psd);
  if (NS_SUCCEEDED(rv)) {
    // Link up span frame's pfd to point to its child span data
    PerFrameData* pfd = mCurrentSpan->mLastFrame;
    NS_ASSERTION(pfd->mFrame == aFrame, "huh?");
    pfd->mSpan = psd;

    // Init new span
    psd->mFrame = pfd;
    psd->mParent = mCurrentSpan;
    psd->mReflowState = aSpanReflowState;
    psd->mLeftEdge = aLeftEdge;
    psd->mX = aLeftEdge;
    psd->mRightEdge = aRightEdge;

    const nsStyleText* styleText = aSpanReflowState->frame->GetStyleText();
    switch (styleText->mWhiteSpace) {
    case NS_STYLE_WHITESPACE_PRE:
    case NS_STYLE_WHITESPACE_NOWRAP:
        psd->mNoWrap = PR_TRUE;
        break;
    default:
        psd->mNoWrap = PR_FALSE;
        break;
    }
    psd->mDirection = aSpanReflowState->mStyleVisibility->mDirection;
    psd->mChangedFrameDirection = PR_FALSE;

    // Switch to new span
    mCurrentSpan = psd;
    mSpanDepth++;
  }
  return rv;
}

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Definition at line 791 of file nsLineLayout.cpp.

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PRBool nsLineLayout::CanPlaceFrame ( PerFrameData pfd,
const nsHTMLReflowState aReflowState,
PRBool  aNotSafeToBreak,
nsHTMLReflowMetrics aMetrics,
nsReflowStatus aStatus 
) [protected]

See if the frame can be placed now that we know it's desired size.

We can always place the frame if the line is empty. Note that we know that the reflow-status is not a break-before because if it was ReflowFrame above would have returned false, preventing this method from being called. The logic in this method assumes that.

Note that there is no check against the Y coordinate because we assume that the caller will take care of that.

Definition at line 1261 of file nsLineLayout.cpp.

{
  NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data");
  // Compute right margin to use
  if (0 != pfd->mBounds.width) {
    NS_ASSERTION(aReflowState.mStyleDisplay->mFloats == NS_STYLE_FLOAT_NONE,
                 "How'd we get a floated inline frame? "
                 "The frame ctor should've dealt with this.");

    // XXXwaterson this is probably not exactly right; e.g., embeddings, etc.
    PRBool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);

    if (NS_FRAME_IS_NOT_COMPLETE(aStatus) && !pfd->GetFlag(PFD_ISLETTERFRAME)) {
      // Only apply end margin for the last-in-flow. Zero this out so
      // that when we compute the max-element-width of the frame we
      // will properly avoid adding in the end margin.
      if (ltr)
        pfd->mMargin.right = 0;
      else
        pfd->mMargin.left = 0;
    }
  }
  else {
    // Don't apply margin to empty frames.
    pfd->mMargin.left = pfd->mMargin.right = 0;
  }

  PerSpanData* psd = mCurrentSpan;
  if (psd->mNoWrap) {
    // When wrapping is off, everything fits.
    return PR_TRUE;
  }

#ifdef NOISY_CAN_PLACE_FRAME
  if (nsnull != psd->mFrame) {
    nsFrame::ListTag(stdout, psd->mFrame->mFrame);
  }
  else {
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
  } 
  printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
  nsFrame::ListTag(stdout, pfd->mFrame);
  printf(" frameWidth=%d\n", pfd->mBounds.XMost() + rightMargin - psd->mX);
#endif

  // Set outside to PR_TRUE if the result of the reflow leads to the
  // frame sticking outside of our available area.
  PRBool outside = pfd->mBounds.XMost() + pfd->mMargin.right > psd->mRightEdge;
  if (!outside) {
    // If it fits, it fits
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> inside\n");
#endif
    return PR_TRUE;
  }

  // When it doesn't fit, check for a few special conditions where we
  // allow it to fit anyway.
  if (0 == pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right) {
    // Empty frames always fit right where they are
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> empty frame fits\n");
#endif
    return PR_TRUE;
  }

#ifdef FIX_BUG_50257
  // another special case:  always place a BR
  if (nsLayoutAtoms::brFrame == pfd->mFrame->GetType()) {
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> BR frame fits\n");
#endif
    return PR_TRUE;
  }
#endif

  if (aNotSafeToBreak) {
    // There are no frames on the line or we are in the first word on
    // the line. If the line isn't impacted by a float then the
    // current frame fits.
    if (!GetFlag(LL_IMPACTEDBYFLOATS)) {
#ifdef NOISY_CAN_PLACE_FRAME
      printf("   ==> not-safe and not-impacted fits: ");
      while (nsnull != psd) {
        printf("<psd=%p x=%d left=%d> ", psd, psd->mX, psd->mLeftEdge);
        psd = psd->mParent;
      }
      printf("\n");
#endif
      return PR_TRUE;
    }
    else if (GetFlag(LL_LASTFLOATWASLETTERFRAME)) {
      // Another special case: see if the float is a letter
      // frame. If it is, then allow the frame next to it to fit.
      if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME)) {
        // This must be the first piece of non-empty text (because
        // aNotSafeToBreak is true) or its a piece of text that is
        // part of a larger word.
        pfd->SetFlag(PFD_ISSTICKY, PR_TRUE);
      }
      else if (pfd->mSpan) {
        PerFrameData* pf = pfd->mSpan->mFirstFrame;
        while (pf) {
          if (pf->GetFlag(PFD_ISSTICKY)) {
            // If one of the spans children was sticky then the span
            // itself is sticky.
            pfd->SetFlag(PFD_ISSTICKY, PR_TRUE);
          }
          pf = pf->mNext;
        }
      }

      if (pfd->GetFlag(PFD_ISSTICKY)) {
#ifdef NOISY_CAN_PLACE_FRAME
        printf("   ==> last float was letter frame && frame is sticky\n");
#endif
        return PR_TRUE;
      }
    }
  }

  // If this is a piece of text inside a letter frame...
  if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME)) {
    if (psd->mFrame && psd->mFrame->GetFlag(PFD_ISLETTERFRAME)) {
      nsIFrame* prevInFlow = psd->mFrame->mFrame->GetPrevInFlow();
      if (prevInFlow) {
        nsIFrame* prevPrevInFlow = prevInFlow->GetPrevInFlow();
        if (!prevPrevInFlow) {
          // And it's the first continuation of the letter frame...
          // Then make sure that the text fits
          return PR_TRUE;
        }
      }
    }
  }
  else if (pfd->GetFlag(PFD_ISLETTERFRAME)) {
    // If this is the first continuation of the letter frame...
    nsIFrame* prevInFlow = pfd->mFrame->GetPrevInFlow();
    if (prevInFlow) {
      nsIFrame* prevPrevInFlow = prevInFlow->GetPrevInFlow();
      if (!prevPrevInFlow) {
        return PR_TRUE;
      }
    }
  }

  // Special check for span frames
  if (pfd->mSpan && pfd->mSpan->mContainsFloat) {
    // If the span either directly or indirectly contains a float then
    // it fits. Why? It's kind of complicated, but here goes:
    //
    // 1. CanPlaceFrame is used for all frame placements on a line,
    // and in a span. This includes recursively placement of frames
    // inside of spans, and the span itself. Because the logic always
    // checks for room before proceeding (the code above here), the
    // only things on a line will be those things that "fit".
    //
    // 2. Before a float is placed on a line, the line has to be empty
    // (otherwise its a "below current line" flaoter and will be placed
    // after the line).
    //
    // Therefore, if the span directly or indirectly has a float
    // then it means that at the time of the placement of the float
    // the line was empty. Because of #1, only the frames that fit can
    // be added after that point, therefore we can assume that the
    // current span being placed has fit.
    //
    // So how do we get here and have a span that should already fit
    // and yet doesn't: Simple: span's that have the no-wrap attribute
    // set on them and contain a float and are placed where they
    // don't naturally fit.
    return PR_TRUE;
 }

#ifdef NOISY_CAN_PLACE_FRAME
  printf("   ==> didn't fit\n");
#endif
  aStatus = NS_INLINE_LINE_BREAK_BEFORE();
  return PR_FALSE;
}

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void nsLineLayout::ComputeJustificationWeights ( PerSpanData psd,
PRInt32 numSpaces,
PRInt32 numLetters 
) [protected]

Definition at line 2691 of file nsLineLayout.cpp.

{
  NS_ASSERTION(aPSD, "null arg");
  NS_ASSERTION(aNumSpaces, "null arg");
  NS_ASSERTION(aNumLetters, "null arg");
  PRInt32 numSpaces = 0;
  PRInt32 numLetters = 0;

  for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nsnull; pfd = pfd->mNext) {

    if (PR_TRUE == pfd->GetFlag(PFD_ISTEXTFRAME)) {
      numSpaces += pfd->mJustificationNumSpaces;
      numLetters += pfd->mJustificationNumLetters;
    }
    else if (pfd->mSpan != nsnull) {
      PRInt32 spanSpaces;
      PRInt32 spanLetters;

      ComputeJustificationWeights(pfd->mSpan, &spanSpaces, &spanLetters);

      numSpaces += spanSpaces;
      numLetters += spanLetters;
    }
  }

  *aNumSpaces = numSpaces;
  *aNumLetters = numLetters;
}

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Definition at line 345 of file nsLineLayout.cpp.

{
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowState->frame);
  printf(": EndLineReflow: width=%d\n", mRootSpan->mX - mRootSpan->mLeftEdge);
#endif

  FreeSpan(mRootSpan);
  mCurrentSpan = mRootSpan = nsnull;

  NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
  NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");

#if 0
  static PRInt32 maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
  static PRInt32 maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES;
  if (mSpansAllocated > maxSpansAllocated) {
    printf("XXX: saw a line with %d spans\n", mSpansAllocated);
    maxSpansAllocated = mSpansAllocated;
  }
  if (mFramesAllocated > maxFramesAllocated) {
    printf("XXX: saw a line with %d frames\n", mFramesAllocated);
    maxFramesAllocated = mFramesAllocated;
  }
#endif
}

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void nsLineLayout::EndSpan ( nsIFrame aFrame,
nsSize aSizeResult,
nscoord aMaxElementWidth 
)

Definition at line 553 of file nsLineLayout.cpp.

{
  NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span");
#ifdef NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  nsFrame::ListTag(stdout, aFrame);
  printf(": EndSpan width=%d\n", mCurrentSpan->mX - mCurrentSpan->mLeftEdge);
#endif
  PerSpanData* psd = mCurrentSpan;
  nscoord width = 0;
  nscoord maxHeight = 0;
  nscoord maxElementWidth = 0;
  if (nsnull != psd->mLastFrame) {
    width = psd->mX - psd->mLeftEdge;
    PerFrameData* pfd = psd->mFirstFrame;
    while (nsnull != pfd) {
      /* there's one oddball case we need to guard against
       * if we're reflowed with NS_UNCONSTRAINEDSIZE
       * then the last frame will not contribute to the max element size height
       * if it is a text frame that only contains whitespace
       */
      if (NS_UNCONSTRAINEDSIZE != psd->mRightEdge ||  // it's not an unconstrained reflow
          pfd->mNext ||                               // or it's not the last frame in the span
          !pfd->GetFlag(PFD_ISTEXTFRAME) ||           // or it's not a text frame
          pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)  // or it contains something other than whitespace
         ) {
        if (pfd->mBounds.height > maxHeight) maxHeight = pfd->mBounds.height;

        // Compute max-element-width if necessary
        if (aMaxElementWidth) {
          nscoord mw = pfd->mMaxElementWidth;
          // add only fixed margins to the MEW
          if (pfd->mMargin.left) {
            if (pfd->mFrame->GetStyleMargin()->mMargin.GetLeftUnit() ==
                eStyleUnit_Coord)
              mw += pfd->mMargin.left;
          }
          if (pfd->mMargin.right) {
            if (pfd->mFrame->GetStyleMargin()->mMargin.GetRightUnit() ==
                eStyleUnit_Coord)
              mw += pfd->mMargin.right;
          }
          if (maxElementWidth < mw) {
            maxElementWidth = mw;
          }
        }
      }
      pfd = pfd->mNext;
    }
  }
  aSizeResult.width = width;
  aSizeResult.height = maxHeight;
  if (aMaxElementWidth) {
    if (psd->mNoWrap) {
      // When we have a non-breakable span, it's max-element-width
      // width is its entire width.
      *aMaxElementWidth = width;
    }
    else {
      *aMaxElementWidth = maxElementWidth;
    }
  }

  mSpanDepth--;
  mCurrentSpan->mReflowState = nsnull;  // no longer valid so null it out!
  mCurrentSpan = mCurrentSpan->mParent;
}

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nsIFrame * nsLineLayout::FindNextText ( nsPresContext aPresContext,
nsIFrame aFrame 
)

Definition at line 3039 of file nsLineLayout.cpp.

{
  // Grovel through the frame hierarchy to find a text frame that is
  // "adjacent" to aFrame.

  // So this is kind of funky. During reflow, overflow frames will
  // have their parent pointers set up lazily. We assume that, on
  // entry, aFrame has it's parent pointer set correctly (as do all of
  // its ancestors). Starting from that, we need to make sure that as
  // we traverse through frames trying to find the next text frame, we
  // leave the frames with their parent pointers set correctly, so the
  // *next* time we come through here, we're good to go.

  // Build a path from the enclosing block frame down to aFrame. We'll
  // use this to walk the frame tree. (XXXwaterson if I was clever, I
  // wouldn't need to build this up before hand, and could incorporate
  // this logic into the walking code directly.)
  nsAutoVoidArray stack;
  for (;;) {
    stack.InsertElementAt(aFrame, 0);

    aFrame = aFrame->GetParent();

    NS_ASSERTION(aFrame, "wow, no block frame found");
    if (! aFrame)
      break;

    if (NS_STYLE_DISPLAY_INLINE != aFrame->GetStyleDisplay()->mDisplay)
      break;
  }

  // Using the path we've built up, walk the frame tree looking for
  // the text frame that follows aFrame.
  PRInt32 count;
  while ((count = stack.Count()) != 0) {
    PRInt32 lastIndex = count - 1;
    nsIFrame* top = NS_STATIC_CAST(nsIFrame*, stack.ElementAt(lastIndex));

    // If this is a frame that'll break a word, then bail.
    PRBool canContinue;
    top->CanContinueTextRun(canContinue);
    if (! canContinue)
      return nsnull;

    // Advance to top's next sibling
    nsIFrame* next = top->GetNextSibling();

    if (! next) {
      // No more siblings. Pop the top element to walk back up the
      // frame tree.
      stack.RemoveElementAt(lastIndex);
      continue;
    }

    // We know top's parent is good, but next's might not be. So let's
    // set it to be sure.
    next->SetParent(top->GetParent());

    // Save next at the top of the stack...
    stack.ReplaceElementAt(next, lastIndex);

    // ...and prowl down to next's deepest child. We'll need to check
    // for potential run-busters "on the way down", too.
    for (;;) {
      next->CanContinueTextRun(canContinue);
      if (! canContinue)
        return nsnull;

      nsIFrame* child = next->GetFirstChild(nsnull);

      if (! child)
        break;

      stack.AppendElement(child);
      next = child;
    }

    // Ignore continuing frames
    if (HasPrevInFlow(next))
      continue;

    // If this is a text frame, return it.
    if (nsLayoutAtoms::textFrame == next->GetType())
      return next;
  }

  // If we get here, then there are no more text frames in this block.
  return nsnull;
}

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Definition at line 3030 of file nsLineLayout.cpp.

{
  if (mWordFrames && 0 != mWordFrames->GetSize()) {
    NS_ASSERTION((void*)aFrame == mWordFrames->PeekFront(), "forget-word-frame");
    mWordFrames->PopFront();
  }
}

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Definition at line 220 of file nsLineLayout.h.

                          {
    if(mWordFrames) {
      mWordFrames->Empty();
    }
  }

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void nsLineLayout::FreeSpan ( PerSpanData psd) [protected]

Definition at line 722 of file nsLineLayout.cpp.

{
  // Free its frames
  PerFrameData* pfd = psd->mFirstFrame;
  while (nsnull != pfd) {
    if (nsnull != pfd->mSpan) {
      FreeSpan(pfd->mSpan);
    }
    PerFrameData* next = pfd->mNext;
    pfd->mNext = mFrameFreeList;
    mFrameFreeList = pfd;
#ifdef DEBUG
    mFramesFreed++;
#endif
    pfd = next;
  }

  // Now put the span on the free list since its free too
  psd->mNextFreeSpan = mSpanFreeList;
  mSpanFreeList = psd;
#ifdef DEBUG
  mSpansFreed++;
#endif
}

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Definition at line 83 of file nsLineLayout.h.

                      {
    return mColumn;
  }

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Definition at line 247 of file nsLineLayout.h.

  {
    return mCompatMode;
  }

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Definition at line 624 of file nsLineLayout.cpp.

{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
  PRInt32 count = 0;
  PerFrameData* pfd = mRootSpan->mFirstFrame;
  while (nsnull != pfd) {
    count++;
    pfd = pfd->mNext;
  }
  return count;
}

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Definition at line 196 of file nsLineLayout.h.

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Definition at line 265 of file nsLineLayout.h.

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PRBool nsLineLayout::GetFlag ( PRUint32  aFlag) const [inline, protected]

Definition at line 179 of file nsLineLayout.h.

  {
    NS_ASSERTION(aFlag<=LL_LASTFLAG, "bad flag");
    PRBool result = (mFlags & aFlag);
    if (result) return PR_TRUE;
    return PR_FALSE;
  }

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Definition at line 291 of file nsLineLayout.h.

{ return mBlockReflowState->frame; }

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Definition at line 232 of file nsLineLayout.h.

  { 
    return GetFlag(LL_LINEENDSINBR); 
  }

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Definition at line 91 of file nsLineLayout.h.

                                {
    return mLineNumber;
  }

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PRBool nsLineLayout::HorizontalAlignFrames ( nsRect aLineBounds,
PRBool  aAllowJustify,
PRBool  aShrinkWrapWidth 
)

Definition at line 2779 of file nsLineLayout.cpp.

{
  PerSpanData* psd = mRootSpan;
  nscoord availWidth = psd->mRightEdge;
  if (NS_UNCONSTRAINEDSIZE == availWidth) {
    // Don't bother horizontal aligning on pass1 table reflow
#ifdef NOISY_HORIZONTAL_ALIGN
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": skipping horizontal alignment in pass1 table reflow\n");
#endif
    return PR_TRUE;
  }
  availWidth -= psd->mLeftEdge;
  nscoord remainingWidth = availWidth - aLineBounds.width;
#ifdef NOISY_HORIZONTAL_ALIGN
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": availWidth=%d lineWidth=%d delta=%d\n",
           availWidth, aLineBounds.width, remainingWidth);
#endif
#ifdef IBMBIDI
  nscoord dx = 0;
#endif

  // XXXldb What if it's less than 0??
  if (remainingWidth > 0)
  {
#ifndef IBMBIDI
    nscoord dx = 0;
#endif
    switch (mTextAlign) {
      case NS_STYLE_TEXT_ALIGN_DEFAULT:
        if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
          // default alignment for left-to-right is left so do nothing
          break;
        }
        // Fall through to align right case for default alignment
        // used when the direction is right-to-left.

      case NS_STYLE_TEXT_ALIGN_RIGHT:
      case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
        dx = remainingWidth;
        break;

      case NS_STYLE_TEXT_ALIGN_LEFT:
      case NS_STYLE_TEXT_ALIGN_MOZ_LEFT:
        break;

      case NS_STYLE_TEXT_ALIGN_JUSTIFY:
        // If this is not the last line then go ahead and justify the
        // frames in the line. If it is the last line then if the
        // direction is right-to-left then we right-align the frames.
        if (aAllowJustify) {
          if (!aShrinkWrapWidth) {
            PRInt32 numSpaces;
            PRInt32 numLetters;
            
            ComputeJustificationWeights(psd, &numSpaces, &numLetters);

            if (numSpaces > 0) {
              FrameJustificationState state = { numSpaces, numLetters, remainingWidth, 0, 0, 0, 0, 0 };

              ApplyFrameJustification(psd, &state);
            }
          }
        }
        else if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
          // right align the frames
          dx = remainingWidth;
        }
        break;

      case NS_STYLE_TEXT_ALIGN_CENTER:
      case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
        dx = remainingWidth / 2;
        break;
    }
#ifdef IBMBIDI
  }
  PRBool isRTL = ( (NS_STYLE_DIRECTION_RTL == psd->mDirection)
                && (!psd->mChangedFrameDirection) );
  if (dx || isRTL) {
    PerFrameData* bulletPfd = nsnull;
    nscoord maxX = aLineBounds.XMost() + dx;
    PRBool isVisualRTL = PR_FALSE;

    if (isRTL) {
      if (psd->mLastFrame->GetFlag(PFD_ISBULLET) )
        bulletPfd = psd->mLastFrame;
  
      psd->mChangedFrameDirection = PR_TRUE;

      isVisualRTL = mPresContext->IsVisualMode();
    }
    if (dx || isVisualRTL)
#else
    if (0 != dx)
#endif
    {
      // If we need to move the frames but we're shrink wrapping, then
      // we need to wait until the final width is known
      if (aShrinkWrapWidth) {
        return PR_FALSE;
      }
      for (PerFrameData* pfd = psd->mFirstFrame; pfd
#ifdef IBMBIDI
           && bulletPfd != pfd
#endif
           ; pfd = pfd->mNext) {
#ifdef IBMBIDI
        if (isVisualRTL) {
          // XXXldb Ugh.  Could we handle this earlier so we don't get here?
          maxX = pfd->mBounds.x = maxX - (pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right);
        }
        else
#endif // IBMBIDI
          pfd->mBounds.x += dx;
        pfd->mFrame->SetRect(pfd->mBounds);
      }
      aLineBounds.x += dx;
    }
#ifndef IBMBIDI
    if ((NS_STYLE_DIRECTION_RTL == psd->mDirection) &&
        !psd->mChangedFrameDirection) {
      psd->mChangedFrameDirection = PR_TRUE;
  
      /* Assume that all frames have been right aligned.*/
      if (aShrinkWrapWidth) {
        return PR_FALSE;
      }
      PerFrameData* pfd = psd->mFirstFrame;
      PRUint32 maxX = psd->mRightEdge;
      while (nsnull != pfd) {
        pfd->mBounds.x = maxX - (pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right);
        pfd->mFrame->SetRect(pfd->mBounds);
        maxX = pfd->mBounds.x;
        pfd = pfd->mNext;
      }
    }
#endif // ndef IBMBIDI
  }

  return PR_TRUE;
}

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PRBool nsLineLayout::InBlockContext ( ) const [inline, protected]

Definition at line 470 of file nsLineLayout.h.

                                {
    return mSpanDepth == 0;
  }

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void nsLineLayout::Init ( nsBlockReflowState aState,
nscoord  aMinLineHeight,
PRInt32  aLineNumber 
) [inline]

Definition at line 76 of file nsLineLayout.h.

                                 {
    mBlockRS = aState;
    mMinLineHeight = aMinLineHeight;
    mLineNumber = aLineNumber;
  }

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PRBool nsLineLayout::InitFloat ( nsPlaceholderFrame aFrame,
nsReflowStatus aReflowStatus 
) [inline]

Definition at line 255 of file nsLineLayout.h.

                                                                              {
    return mBlockRS->InitFloat(*this, aFrame, aReflowStatus);
  }

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PRBool nsLineLayout::InStrictMode ( ) const [inline]

Definition at line 242 of file nsLineLayout.h.

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PRBool nsLineLayout::InWord ( ) const [inline]

Definition at line 214 of file nsLineLayout.h.

                        {
    return mWordFrames && 0 != mWordFrames->GetSize();
  }

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PRBool nsLineLayout::IsPercentageAwareReplacedElement ( nsPresContext aPresContext,
nsIFrame aFrame 
) [static]

Definition at line 1558 of file nsLineLayout.cpp.

{
  if (aFrame->GetStateBits() & NS_FRAME_REPLACED_ELEMENT)
  {
    nsIAtom* frameType = aFrame->GetType();
    if (nsLayoutAtoms::brFrame != frameType && 
        nsLayoutAtoms::textFrame != frameType)
    {
      const nsStyleMargin* margin = aFrame->GetStyleMargin();
      if (IsPercentageUnitSides(&margin->mMargin)) {
        return PR_TRUE;
      }

      const nsStylePadding* padding = aFrame->GetStylePadding();
      if (IsPercentageUnitSides(&padding->mPadding)) {
        return PR_TRUE;
      }

      // Borders aren't percentage aware

      const nsStylePosition* pos = aFrame->GetStylePosition();
      if (eStyleUnit_Percent == pos->mWidth.GetUnit()
        || eStyleUnit_Percent == pos->mMaxWidth.GetUnit()
        || eStyleUnit_Percent == pos->mMinWidth.GetUnit()
        || eStyleUnit_Percent == pos->mHeight.GetUnit()
        || eStyleUnit_Percent == pos->mMinHeight.GetUnit()
        || eStyleUnit_Percent == pos->mMaxHeight.GetUnit()
        || IsPercentageUnitSides(&pos->mOffset)) { // XXX need more here!!!
        return PR_TRUE;
      }
    }
  }

  return PR_FALSE;
}

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Definition at line 1549 of file nsLineLayout.cpp.

{
  return eStyleUnit_Percent == aSides->GetLeftUnit()
      || eStyleUnit_Percent == aSides->GetRightUnit()
      || eStyleUnit_Percent == aSides->GetTopUnit()
      || eStyleUnit_Percent == aSides->GetBottomUnit();
}

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Definition at line 748 of file nsLineLayout.cpp.

{
  PerSpanData* psd = mCurrentSpan;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nsnull != pfd) {
    if (0 != pfd->mBounds.height) {
      return PR_FALSE;
    }
    pfd = pfd->mNext;
  }
  return PR_TRUE;
}

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Definition at line 797 of file nsLineLayout.cpp.

{
  if ((0 != mTotalPlacedFrames) || GetFlag(LL_IMPACTEDBYFLOATS)) {
    return PR_TRUE;
  }
  return PR_FALSE;
}

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Definition at line 762 of file nsLineLayout.cpp.

{
  PerFrameData* pfd = mFrameFreeList;
  if (nsnull == pfd) {
    void *mem;
    PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerFrameData));
    if (nsnull == mem) {
      return NS_ERROR_OUT_OF_MEMORY;
    }
    pfd = NS_REINTERPRET_CAST(PerFrameData*, mem);
  }
  else {
    mFrameFreeList = pfd->mNext;
  }
  pfd->mSpan = nsnull;
  pfd->mNext = nsnull;
  pfd->mPrev = nsnull;
  pfd->mFrame = nsnull;
  pfd->mFlags = 0;  // all flags default to false

#ifdef DEBUG
  pfd->mVerticalAlign = 0xFF;
  mFramesAllocated++;
#endif
  *aResult = pfd;
  return NS_OK;
}

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nsresult nsLineLayout::NewPerSpanData ( PerSpanData **  aResult) [protected]

Definition at line 476 of file nsLineLayout.cpp.

{
  PerSpanData* psd = mSpanFreeList;
  if (nsnull == psd) {
    void *mem;
    PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerSpanData));
    if (nsnull == mem) {
      return NS_ERROR_OUT_OF_MEMORY;
    }
    psd = NS_REINTERPRET_CAST(PerSpanData*, mem);
  }
  else {
    mSpanFreeList = psd->mNextFreeSpan;
  }
  psd->mParent = nsnull;
  psd->mFrame = nsnull;
  psd->mFirstFrame = nsnull;
  psd->mLastFrame = nsnull;
  psd->mContainsFloat = PR_FALSE;
  psd->mZeroEffectiveSpanBox = PR_FALSE;

#ifdef DEBUG
  mSpansAllocated++;
#endif
  *aResult = psd;
  return NS_OK;
}

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void nsLineLayout::PlaceFrame ( PerFrameData pfd,
nsHTMLReflowMetrics aMetrics 
) [protected]

Place the frame.

Update running counters.

Definition at line 1450 of file nsLineLayout.cpp.

{
  // If frame is zero width then do not apply its left and right margins.
  PerSpanData* psd = mCurrentSpan;
  PRBool emptyFrame = PR_FALSE;
  if ((0 == pfd->mBounds.width) && (0 == pfd->mBounds.height)) {
    pfd->mBounds.x = psd->mX;
    pfd->mBounds.y = mTopEdge;
    emptyFrame = PR_TRUE;
  }

  // Record ascent and update max-ascent and max-descent values
  pfd->mAscent = aMetrics.ascent;
  pfd->mDescent = aMetrics.descent;

  // If the band was updated during the reflow of that frame then we
  // need to adjust any prior frames that were reflowed.
  if (GetFlag(LL_UPDATEDBAND) && InBlockContext()) {
    UpdateFrames();
    SetFlag(LL_UPDATEDBAND, PR_FALSE);
  }

  // Advance to next X coordinate
  psd->mX = pfd->mBounds.XMost() + pfd->mMargin.right;
  psd->mRightEdge = PR_MAX(psd->mRightEdge, psd->mX);

  // If the frame is a not aware of white-space and it takes up some
  // width, disable leading white-space compression for the next frame
  // to be reflowed.
  if ((!GetFlag(LL_UNDERSTANDSNWHITESPACE)) && pfd->mBounds.width) {
    SetFlag(LL_ENDSINWHITESPACE, PR_FALSE);
  }

  // Count the number of non-empty frames on the line...
  if (!emptyFrame) {
    mTotalPlacedFrames++;
  }
  if (psd->mX != psd->mLeftEdge || pfd->mBounds.x != psd->mLeftEdge) {
    // As soon as a frame placed on the line advances an X coordinate
    // of any span we can no longer place a float on the line.
    SetFlag(LL_CANPLACEFLOAT, PR_FALSE);
  }
}

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void nsLineLayout::PlaceTopBottomFrames ( PerSpanData psd,
nscoord  aDistanceFromTop,
nscoord  aLineHeight 
) [protected]

Definition at line 1853 of file nsLineLayout.cpp.

{
  PerFrameData* pfd = psd->mFirstFrame;
  while (nsnull != pfd) {
    PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
    NS_ASSERTION(0xFF != pfd->mVerticalAlign, "umr");
#endif
    switch (pfd->mVerticalAlign) {
      case VALIGN_TOP:
        if (span) {
          pfd->mBounds.y = -aDistanceFromTop - pfd->mBorderPadding.top +
            span->mTopLeading;
        }
        else {
          pfd->mBounds.y = -aDistanceFromTop + pfd->mMargin.top;
        }
        pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
        printf("    ");
        nsFrame::ListTag(stdout, pfd->mFrame);
        printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
               pfd->mBounds.y, aDistanceFromTop,
               span ? pfd->mBorderPadding.top : 0,
               span ? span->mTopLeading : 0);
#endif
        break;
      case VALIGN_BOTTOM:
        if (span) {
          // Compute bottom leading
          pfd->mBounds.y = -aDistanceFromTop + aLineHeight -
            pfd->mBounds.height + pfd->mBorderPadding.bottom -
            span->mBottomLeading;
        }
        else {
          pfd->mBounds.y = -aDistanceFromTop + aLineHeight -
            pfd->mMargin.bottom - pfd->mBounds.height;
        }
        pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
        printf("    ");
        nsFrame::ListTag(stdout, pfd->mFrame);
        printf(": y=%d\n", pfd->mBounds.y);
#endif
        break;
    }
    if (span) {
      nscoord distanceFromTop = aDistanceFromTop + pfd->mBounds.y;
      PlaceTopBottomFrames(span, distanceFromTop, aLineHeight);
    }
    pfd = pfd->mNext;
  }
}

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void nsLineLayout::PushFrame ( nsIFrame aFrame) [protected]

Definition at line 681 of file nsLineLayout.cpp.

{
  PerSpanData* psd = mCurrentSpan;
  NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame");

#ifdef REALLY_NOISY_PUSHING
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("PushFrame %p, before:\n", psd);
  DumpPerSpanData(psd, 1);
#endif

  // Take the last frame off of the span's frame list
  PerFrameData* pfd = psd->mLastFrame;
  if (pfd == psd->mFirstFrame) {
    // We are pushing away the only frame...empty the list
    psd->mFirstFrame = nsnull;
    psd->mLastFrame = nsnull;
  }
  else {
    PerFrameData* prevFrame = pfd->mPrev;
    prevFrame->mNext = nsnull;
    psd->mLastFrame = prevFrame;
  }

  // Now free it, and if it has a span, free that too
  pfd->mNext = mFrameFreeList;
  mFrameFreeList = pfd;
#ifdef DEBUG
  mFramesFreed++;
#endif
  if (nsnull != pfd->mSpan) {
    FreeSpan(pfd->mSpan);
  }
#ifdef NOISY_PUSHING
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("PushFrame: %p after:\n", psd);
  DumpPerSpanData(psd, 1);
#endif
}

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void nsLineLayout::RecordWordFrame ( nsIFrame aWordFrame) [inline]

Definition at line 209 of file nsLineLayout.h.

                                             {
    if(mWordFrames || AllocateDeque())
      mWordFrames->Push(aWordFrame);
  }

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nsresult nsLineLayout::ReflowFrame ( nsIFrame aFrame,
nsReflowStatus aReflowStatus,
nsHTMLReflowMetrics aMetrics,
PRBool aPushedFrame 
)

Definition at line 806 of file nsLineLayout.cpp.

{
  // Initialize OUT parameter
  aPushedFrame = PR_FALSE;

  PerFrameData* pfd;
  nsresult rv = NewPerFrameData(&pfd);
  if (NS_FAILED(rv)) {
    return rv;
  }
  PerSpanData* psd = mCurrentSpan;
  psd->AppendFrame(pfd);

#ifdef REALLY_NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
  nsFrame::ListTag(stdout, aFrame);
  printf("\n");
#endif

  // Compute the available size for the frame. This available width
  // includes room for the side margins.
  nsSize availSize;
  if (NS_UNCONSTRAINEDSIZE == psd->mRightEdge) {
    availSize.width = NS_UNCONSTRAINEDSIZE;
  }
  else {
    availSize.width = psd->mRightEdge - psd->mX;
    if (psd->mNoWrap) {
      // Make up a width to use for reflowing into.  XXX what value to
      // use? for tables, we want to limit it; for other elements
      // (e.g. text) it can be unlimited...
      availSize.width = psd->mReflowState->availableWidth;
    }
  }
  // For now, set the available height to unconstrained always.
  // XXX inline blocks and tables won't be able to break across pages/
  // columns, but it's not clear how to handle that anyway
  availSize.height = NS_UNCONSTRAINEDSIZE;

  // Get reflow reason set correctly. It's possible that a child was
  // created and then it was decided that it could not be reflowed
  // (for example, a block frame that isn't at the start of a
  // line). In this case the reason will be wrong so we need to check
  // the frame state.
  const nsHTMLReflowState* rs = psd->mReflowState;
  nsReflowReason reason = eReflowReason_Resize;
  if (NS_FRAME_FIRST_REFLOW & aFrame->GetStateBits()) {
    reason = eReflowReason_Initial;
  }
  else if (rs->reason == eReflowReason_Initial &&
           mBlockReflowState->reason == eReflowReason_StyleChange) {
    // The frame we're about to reflow is an _old_ frame that was
    // pushed inside a _new_ parent (overflow).

    // So we propagate the same 'style change' that led to creating
    // the new overflow parent to which this frame is now the child
    reason = eReflowReason_StyleChange;
  }
  else if (rs->reason == eReflowReason_Incremental) { // XXX
    // XXXwaterson (above) previously used mBlockReflowState rather
    // than psd->mReflowState.

    // If the frame we're about to reflow is on the reflow path, then
    // propagate the reflow as `incremental' so it unwinds correctly
    // to the target frames below us.
    PRBool frameIsOnReflowPath = rs->path->HasChild(aFrame);
    if (frameIsOnReflowPath)
      reason = eReflowReason_Incremental;

    // But...if the incremental reflow command is a StyleChanged
    // reflow and its target is the current span, change the reason
    // to `style change', so that it propagates through the entire
    // subtree.
    nsHTMLReflowCommand* rc = rs->path->mReflowCommand;
    if (rc) {
      nsReflowType type = rc->Type();
      if (type == eReflowType_StyleChanged) {
        nsIFrame* parentFrame = psd->mFrame
          ? psd->mFrame->mFrame
          : mBlockReflowState->frame;
        if (rc->GetTarget() == parentFrame) {
          reason = eReflowReason_StyleChange;
        }
      }
      else if (type == eReflowType_ReflowDirty &&
               (aFrame->GetStateBits() & NS_FRAME_IS_DIRTY) &&
               !frameIsOnReflowPath) {
        reason = eReflowReason_Dirty;
      }
    }
  }
  else if (rs->reason == eReflowReason_StyleChange) {
    reason = eReflowReason_StyleChange;
  }
  else if (rs->reason == eReflowReason_Dirty) {
    if (aFrame->GetStateBits() & NS_FRAME_IS_DIRTY)
      reason = eReflowReason_Dirty;
  }

  // Setup reflow state for reflowing the frame
  nsHTMLReflowState reflowState(mPresContext, *psd->mReflowState,
                                aFrame, availSize, reason);
  reflowState.mLineLayout = this;
  reflowState.mFlags.mIsTopOfPage = GetFlag(LL_ISTOPOFPAGE);
  SetFlag(LL_UNDERSTANDSNWHITESPACE, PR_FALSE);
  mTextJustificationNumSpaces = 0;
  mTextJustificationNumLetters = 0;

  // Stash copies of some of the computed state away for later
  // (vertical alignment, for example)
  pfd->mFrame = aFrame;
  pfd->mMargin = reflowState.mComputedMargin;
  pfd->mBorderPadding = reflowState.mComputedBorderPadding;
  pfd->mFrameType = reflowState.mFrameType;
  pfd->SetFlag(PFD_RELATIVEPOS,
               (reflowState.mStyleDisplay->mPosition == NS_STYLE_POSITION_RELATIVE));
  if (pfd->GetFlag(PFD_RELATIVEPOS)) {
    pfd->mOffsets = reflowState.mComputedOffsets;
  }

  // NOTE: While the x coordinate remains relative to the parent span,
  // the y coordinate is fixed at the top edge for the line. During
  // VerticalAlignFrames we will repair this so that the y coordinate
  // is properly set and relative to the appropriate span.
  pfd->mBounds.x = psd->mX;
  pfd->mBounds.y = mTopEdge;

  // We want to guarantee that we always make progress when
  // formatting. Therefore, if the object being placed on the line is
  // too big for the line, but it is the only thing on the line
  // (including counting floats) then we go ahead and place it
  // anyway. Its also true that if the object is a part of a larger
  // object (a multiple frame word) then we will place it on the line
  // too.
  //
  // Capture this state *before* we reflow the frame in case it clears
  // the state out. We need to know how to treat the current frame
  // when breaking.
  PRBool notSafeToBreak = CanPlaceFloatNow() || InWord();

  // Apply start margins (as appropriate) to the frame computing the
  // new starting x,y coordinates for the frame.
  ApplyStartMargin(pfd, reflowState);

  // Let frame know that are reflowing it. Note that we don't bother
  // positioning the frame yet, because we're probably going to end up
  // moving it when we do the vertical alignment
  nscoord x = pfd->mBounds.x;
  nscoord y = pfd->mBounds.y;

  aFrame->WillReflow(mPresContext);

  // Adjust spacemanager coordinate system for the frame. The
  // spacemanager coordinates are <b>inside</b> the current spans
  // border+padding, but the x/y coordinates are not (recall that
  // frame coordinates are relative to the parents origin and that the
  // parents border/padding is <b>inside</b> the parent
  // frame. Therefore we have to subtract out the parents
  // border+padding before translating.
  nsHTMLReflowMetrics metrics(mComputeMaxElementWidth);
#ifdef DEBUG
  metrics.width = nscoord(0xdeadbeef);
  metrics.height = nscoord(0xdeadbeef);
  metrics.ascent = nscoord(0xdeadbeef);
  metrics.descent = nscoord(0xdeadbeef);
  if (mComputeMaxElementWidth) {
    metrics.mMaxElementWidth = nscoord(0xdeadbeef);
  }
#endif
  nscoord tx = x - psd->mReflowState->mComputedBorderPadding.left;
  nscoord ty = y - psd->mReflowState->mComputedBorderPadding.top;
  mSpaceManager->Translate(tx, ty);

#ifdef IBMBIDI
  PRInt32 start, end;

  if (mPresContext->BidiEnabled()) {
    if (aFrame->GetStateBits() & NS_FRAME_IS_BIDI) {
      aFrame->GetOffsets(start, end);
    }
  }
#endif // IBMBIDI

  nsIAtom* frameType = aFrame->GetType();

  rv = aFrame->Reflow(mPresContext, metrics, reflowState, aReflowStatus);
  if (NS_FAILED(rv)) {
    NS_WARNING( "Reflow of frame failed in nsLineLayout" );
    return rv;
  }

  pfd->mJustificationNumSpaces = mTextJustificationNumSpaces;
  pfd->mJustificationNumLetters = mTextJustificationNumLetters;

  // XXX See if the frame is a placeholderFrame and if it is process
  // the float.
  if (frameType) {
    if (nsLayoutAtoms::placeholderFrame == frameType) {
      pfd->SetFlag(PFD_ISPLACEHOLDERFRAME, PR_TRUE);
      nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
      if (outOfFlowFrame) {
        nsPlaceholderFrame* placeholder = NS_STATIC_CAST(nsPlaceholderFrame*, aFrame);
        PRBool didPlace;
        if (eReflowReason_Incremental == reason) {
          didPlace = InitFloat(placeholder, aReflowStatus);
        }
        else {
          didPlace = AddFloat(placeholder, aReflowStatus);
        }
        if (!didPlace) {
          aReflowStatus = NS_INLINE_LINE_BREAK_BEFORE();
        }
        if (outOfFlowFrame->GetType() == nsLayoutAtoms::letterFrame) {
          SetFlag(LL_FIRSTLETTERSTYLEOK, PR_FALSE);
        }
      }
    }
    else if (nsLayoutAtoms::textFrame == frameType) {
      // Note non-empty text-frames for inline frame compatability hackery
      pfd->SetFlag(PFD_ISTEXTFRAME, PR_TRUE);
      // XXX An empty text frame at the end of the line seems not
      // to have zero width.
      if (metrics.width) {
        pfd->SetFlag(PFD_ISNONEMPTYTEXTFRAME, PR_TRUE);
        nsIContent* content = pfd->mFrame->GetContent();

        nsCOMPtr<nsITextContent> textContent
          = do_QueryInterface(content);
        if (textContent) {
          pfd->SetFlag(PFD_ISNONWHITESPACETEXTFRAME,
                       !textContent->IsOnlyWhitespace());
// fix for bug 40882
#ifdef IBMBIDI
          if (mPresContext->BidiEnabled()) {
            const nsTextFragment* frag = textContent->Text();
            if (frag->Is2b()) {
              //PRBool isVisual;
              //mPresContext->IsVisualMode(isVisual);
              PRUnichar ch = /*(isVisual) ?
                              *(frag->Get2b() + frag->GetLength() - 1) :*/ *frag->Get2b();
              if (IS_BIDI_DIACRITIC(ch)) {
                mPresContext->PropertyTable()->SetProperty(aFrame,
                           nsLayoutAtoms::endsInDiacritic, NS_INT32_TO_PTR(ch),
                                                           nsnull, nsnull);
              }
            }
          }
#endif // IBMBIDI
        }
      }
    }
    else if (nsLayoutAtoms::letterFrame==frameType) {
      pfd->SetFlag(PFD_ISLETTERFRAME, PR_TRUE);
    }
  }

  mSpaceManager->Translate(-tx, -ty);

  NS_ASSERTION(metrics.width>=0, "bad width");
  NS_ASSERTION(metrics.height>=0,"bad height");
  if (metrics.width<0) metrics.width=0;
  if (metrics.height<0) metrics.height=0;

#ifdef DEBUG
  // Note: break-before means ignore the reflow metrics since the
  // frame will be reflowed another time.
  if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
    if (CRAZY_WIDTH(metrics.width) || CRAZY_HEIGHT(metrics.height)) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(" metrics=%d,%d!\n", metrics.width, metrics.height);
    }
    if (mComputeMaxElementWidth &&
        (nscoord(0xdeadbeef) == metrics.mMaxElementWidth)) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(" didn't set max-element-width!\n");
    }
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
    // Note: there are common reflow situations where this *correctly*
    // occurs; so only enable this debug noise when you really need to
    // analyze in detail.
    if (mComputeMaxElementWidth &&
        (metrics.mMaxElementWidth > metrics.width)) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(": WARNING: maxElementWidth=%d > metrics=%d\n",
             metrics.mMaxElementWidth, metrics.width);
    }
#endif
    if ((metrics.width == nscoord(0xdeadbeef)) ||
        (metrics.height == nscoord(0xdeadbeef)) ||
        (metrics.ascent == nscoord(0xdeadbeef)) ||
        (metrics.descent == nscoord(0xdeadbeef))) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(" didn't set whad %d,%d,%d,%d!\n", metrics.width, metrics.height,
             metrics.ascent, metrics.descent);
    }
  }
#endif
#ifdef DEBUG
  if (nsBlockFrame::gNoisyMaxElementWidth) {
    nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
    if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
      if (mComputeMaxElementWidth) {
        printf("  ");
        nsFrame::ListTag(stdout, aFrame);
        printf(": maxElementWidth=%d wh=%d,%d,\n",
               metrics.mMaxElementWidth,
               metrics.width, metrics.height);
      }
    }
  }
#endif

  // Unlike with non-inline reflow, the overflow area here does *not*
  // include the accumulation of the frame's bounds and its inline
  // descendants' bounds. Nor does it include the outline area; it's
  // just the union of the bounds of any absolute children. That is
  // added in later by nsLineLayout::ReflowInlineFrames.
  pfd->mCombinedArea = metrics.mOverflowArea;

  pfd->mBounds.width = metrics.width;
  pfd->mBounds.height = metrics.height;
  if (mComputeMaxElementWidth) {
    pfd->mMaxElementWidth = metrics.mMaxElementWidth;
  }

  // Size the frame, but |RelativePositionFrames| will size the view.
  aFrame->SetSize(nsSize(metrics.width, metrics.height));

  // Tell the frame that we're done reflowing it
  aFrame->DidReflow(mPresContext, &reflowState, NS_FRAME_REFLOW_FINISHED);

  if (aMetrics) {
    *aMetrics = metrics;
  }

  if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
    // If frame is complete and has a next-in-flow, we need to delete
    // them now. Do not do this when a break-before is signaled because
    // the frame is going to get reflowed again (and may end up wanting
    // a next-in-flow where it ends up).
    if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
      nsIFrame* kidNextInFlow = aFrame->GetNextInFlow();
      if (nsnull != kidNextInFlow) {
        // Remove all of the childs next-in-flows. Make sure that we ask
        // the right parent to do the removal (it's possible that the
        // parent is not this because we are executing pullup code)
        nsHTMLContainerFrame* parent = NS_STATIC_CAST(nsHTMLContainerFrame*,
                                                      kidNextInFlow->GetParent());
        parent->DeleteNextInFlowChild(mPresContext, kidNextInFlow);
      }
    }

    // See if we can place the frame. If we can't fit it, then we
    // return now.
    if (CanPlaceFrame(pfd, reflowState, notSafeToBreak, metrics, aReflowStatus)) {
      // Place the frame, updating aBounds with the final size and
      // location.  Then apply the bottom+right margins (as
      // appropriate) to the frame.
      PlaceFrame(pfd, metrics);
      PerSpanData* span = pfd->mSpan;
      if (span) {
        // The frame we just finished reflowing is an inline
        // container.  It needs its child frames vertically aligned,
        // so do most of it now.
        VerticalAlignFrames(span);
      }
    }
    else {
      PushFrame(aFrame);
      aPushedFrame = PR_TRUE;
    }
  }
  else {
    PushFrame(aFrame);
  }

#ifdef REALLY_NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("End ReflowFrame ");
  nsFrame::ListTag(stdout, aFrame);
  printf(" status=%x\n", aReflowStatus);
#endif

  if (aFrame->GetStateBits() & NS_FRAME_IS_BIDI) {
    // Since aReflowStatus may change, check it at the end
    if (NS_INLINE_IS_BREAK_BEFORE(aReflowStatus) ) {
      aFrame->AdjustOffsetsForBidi(start, end);
    }
    else if (!NS_FRAME_IS_COMPLETE(aReflowStatus) ) {
      PRInt32 newEnd;
      aFrame->GetOffsets(start, newEnd);
      if (newEnd != end) {
        nsIFrame* nextInFlow = aFrame->GetNextInFlow();
        if (nextInFlow) {
          nextInFlow->GetOffsets(start, end);
          nextInFlow->AdjustOffsetsForBidi(newEnd, end);
        } // nextInFlow
      } // newEnd != end
    } // !NS_FRAME_IS_COMPLETE(aReflowStatus)
  } // isBidiFrame

  return rv;
}

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Handle all the relative positioning in the line, compute the combined area (== overflow area) for the line, and handle view sizing/positioning and the setting of NS_FRAME_OUTSIDE_CHILDREN.

Definition at line 2926 of file nsLineLayout.cpp.

{
  RelativePositionFrames(mRootSpan, aCombinedArea);
}

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void nsLineLayout::RelativePositionFrames ( PerSpanData psd,
nsRect aCombinedArea 
) [protected]

Definition at line 2932 of file nsLineLayout.cpp.

{
  nsRect combinedAreaResult;
  if (nsnull != psd->mFrame) {
    // The span's overflow area comes in three parts:
    // -- this frame's width and height
    // -- the pfd->mCombinedArea, which is the area of a bullet or the union
    // of a relatively positioned frame's absolute children
    // -- the bounds of all inline descendants
    // The former two parts are computed right here, we gather the descendants
    // below.
    nsRect adjustedBounds(0, 0, psd->mFrame->mBounds.width,
                          psd->mFrame->mBounds.height);
    combinedAreaResult.UnionRect(psd->mFrame->mCombinedArea, adjustedBounds);
  }
  else {
    // The minimum combined area for the frames that are direct
    // children of the block starts at the upper left corner of the
    // line and is sized to match the size of the line's bounding box
    // (the same size as the values returned from VerticalAlignFrames)
    combinedAreaResult.x = psd->mLeftEdge;
    // If this turns out to be negative, the rect will be treated as empty.
    // Which is just fine.
    combinedAreaResult.width = psd->mX - combinedAreaResult.x;
    combinedAreaResult.y = mTopEdge;
    combinedAreaResult.height = mFinalLineHeight;
  }

  for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
    nsPoint origin = nsPoint(pfd->mBounds.x, pfd->mBounds.y);
    nsIFrame* frame = pfd->mFrame;

    // Adjust the origin of the frame
    if (pfd->GetFlag(PFD_RELATIVEPOS)) {
      // right and bottom are handled by
      // nsHTMLReflowState::ComputeRelativeOffsets
      nsPoint change(pfd->mOffsets.left, pfd->mOffsets.top);
      frame->SetPosition(frame->GetPosition() + change);
      origin += change;
    }

    // We must position the view correctly before positioning its
    // descendants so that widgets are positioned properly (since only
    // some views have widgets).
    if (frame->HasView())
      nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
                                                 frame->GetView(),
                                                 &pfd->mCombinedArea, //ignored
                                                 NS_FRAME_NO_SIZE_VIEW);

    // Note: the combined area of a child is in its coordinate
    // system. We adjust the childs combined area into our coordinate
    // system before computing the aggregated value by adding in
    // <b>x</b> and <b>y</b> which were computed above.
    nsRect r;
    if (pfd->mSpan) {
      // Compute a new combined area for the child span before
      // aggregating it into our combined area.
      RelativePositionFrames(pfd->mSpan, r);
    } else {
      // For simple text frames we take the union of the combined area
      // and the width/height. I think the combined area should always
      // equal the bounds in this case, but this is safe.
      nsRect adjustedBounds(0, 0, pfd->mBounds.width, pfd->mBounds.height);
      r.UnionRect(pfd->mCombinedArea, adjustedBounds);

      // If we have something that's not an inline but with a complex frame
      // hierarchy inside that contains views, they need to be
      // positioned.
      // All descendant views must be repositioned even if this frame
      // does have a view in case this frame's view does not have a
      // widget and some of the descendant views do have widgets --
      // otherwise the widgets won't be repositioned.
      nsContainerFrame::PositionChildViews(frame);
    }

    // Do this here (rather than along with NS_FRAME_OUTSIDE_CHILDREN
    // handling below) so we get leaf frames as well.  No need to worry
    // about the root span, since it doesn't have a frame.
    if (frame->HasView())
      nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
                                                 frame->GetView(), &r,
                                                 NS_FRAME_NO_MOVE_VIEW);

    combinedAreaResult.UnionRect(combinedAreaResult, r + origin);
  }

  // If we just computed a spans combined area, we need to update its
  // NS_FRAME_OUTSIDE_CHILDREN bit..
  if (psd->mFrame) {
    PerFrameData* spanPFD = psd->mFrame;
    nsIFrame* frame = spanPFD->mFrame;
    frame->FinishAndStoreOverflow(&combinedAreaResult, frame->GetSize());
  }
  aCombinedArea = combinedAreaResult;
}

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Definition at line 130 of file nsLineLayout.h.

                                           {
    PushFrame(aFrame);
  }

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void nsLineLayout::SetColumn ( PRInt32  aNewColumn) [inline]

Definition at line 87 of file nsLineLayout.h.

                                     {
    mColumn = aNewColumn;
  }

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Definition at line 192 of file nsLineLayout.h.

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Definition at line 273 of file nsLineLayout.h.

                                             {
    mFirstLetterFrame = aFrame;
  }

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Definition at line 269 of file nsLineLayout.h.

                                              {
    SetFlag(LL_FIRSTLETTERSTYLEOK, aSetting);
  }

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void nsLineLayout::SetFlag ( PRUint32  aFlag,
PRBool  aValue 
) [inline, protected]

Definition at line 167 of file nsLineLayout.h.

  {
    NS_ASSERTION(aFlag<=LL_LASTFLAG, "bad flag");
    NS_ASSERTION(aValue==PR_FALSE || aValue==PR_TRUE, "bad value");
    if (aValue) { // set flag
      mFlags |= aFlag;
    }
    else {        // unset flag
      mFlags &= ~aFlag;
    }
  }

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Definition at line 237 of file nsLineLayout.h.

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void nsLineLayout::SetTextJustificationWeights ( PRInt32  aNumSpaces,
PRInt32  aNumLetters 
) [inline]

Definition at line 204 of file nsLineLayout.h.

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Definition at line 200 of file nsLineLayout.h.

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Definition at line 637 of file nsLineLayout.cpp.

{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");

#ifdef REALLY_NOISY_PUSHING
  printf("SplitLineTo %d (current count=%d); before:\n", aNewCount,
         GetCurrentSpanCount());
  DumpPerSpanData(mRootSpan, 1);
#endif
  PerSpanData* psd = mRootSpan;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nsnull != pfd) {
    if (--aNewCount == 0) {
      // Truncate list at pfd (we keep pfd, but anything following is freed)
      PerFrameData* next = pfd->mNext;
      pfd->mNext = nsnull;
      psd->mLastFrame = pfd;

      // Now release all of the frames following pfd
      pfd = next;
      while (nsnull != pfd) {
        next = pfd->mNext;
        pfd->mNext = mFrameFreeList;
        mFrameFreeList = pfd;
#ifdef DEBUG
        mFramesFreed++;
#endif
        if (nsnull != pfd->mSpan) {
          FreeSpan(pfd->mSpan);
        }
        pfd = next;
      }
      break;
    }
    pfd = pfd->mNext;
  }
#ifdef NOISY_PUSHING
  printf("SplitLineTo %d (current count=%d); after:\n", aNewCount,
         GetCurrentSpanCount());
  DumpPerSpanData(mRootSpan, 1);
#endif
}

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Definition at line 3131 of file nsLineLayout.cpp.

{
  const nsStyleDisplay* display = aFrame->GetStyleDisplay();
  if (NS_STYLE_POSITION_ABSOLUTE == display->mPosition) {
    return PR_FALSE;
  }
  if (NS_STYLE_FLOAT_NONE != display->mFloats) {
    return PR_FALSE;
  }
  switch (display->mDisplay) {
  case NS_STYLE_DISPLAY_BLOCK:
  case NS_STYLE_DISPLAY_LIST_ITEM:
  case NS_STYLE_DISPLAY_RUN_IN:
  case NS_STYLE_DISPLAY_COMPACT:
  case NS_STYLE_DISPLAY_TABLE:
    return PR_TRUE;
  }
  return PR_FALSE;
}

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Definition at line 2682 of file nsLineLayout.cpp.

{
  PerSpanData* psd = mRootSpan;
  nscoord deltaWidth;
  TrimTrailingWhiteSpaceIn(psd, &deltaWidth);
  return 0 != deltaWidth;
}

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PRBool nsLineLayout::TrimTrailingWhiteSpaceIn ( PerSpanData psd,
nscoord aDeltaWidth 
) [protected]

Definition at line 2556 of file nsLineLayout.cpp.

{
#ifndef IBMBIDI
// XXX what about NS_STYLE_DIRECTION_RTL?
  if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
    *aDeltaWidth = 0;
    return PR_TRUE;
  }
#endif

  PerFrameData* pfd = psd->mFirstFrame;
  if (!pfd) {
    *aDeltaWidth = 0;
    return PR_FALSE;
  }
  pfd = pfd->Last();
  while (nsnull != pfd) {
#ifdef REALLY_NOISY_TRIM
    nsFrame::ListTag(stdout, (psd == mRootSpan
                              ? mBlockReflowState->frame
                              : psd->mFrame->mFrame));
    printf(": attempting trim of ");
    nsFrame::ListTag(stdout, pfd->mFrame);
    printf("\n");
#endif
    PerSpanData* childSpan = pfd->mSpan;
    if (childSpan) {
      // Maybe the child span has the trailing white-space in it?
      if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaWidth)) {
        nscoord deltaWidth = *aDeltaWidth;
        if (deltaWidth) {
          // Adjust the child spans frame size
          pfd->mBounds.width -= deltaWidth;
          if (psd != mRootSpan) {
            // When the child span is not a direct child of the block
            // we need to update the child spans frame rectangle
            // because it most likely will not be done again. Spans
            // that are direct children of the block will be updated
            // later, however, because the VerticalAlignFrames method
            // will be run after this method.
            nsIFrame* f = pfd->mFrame;
            nsRect r = f->GetRect();
            r.width -= deltaWidth;
            f->SetRect(r);
          }

          // Adjust the right edge of the span that contains the child span
          psd->mX -= deltaWidth;

          // Slide any frames that follow the child span over by the
          // right amount. The only thing that can follow the child
          // span is empty stuff, so we are just making things
          // sensible (keeping the combined area honest).
          while (pfd->mNext) {
            pfd = pfd->mNext;
            pfd->mBounds.x -= deltaWidth;
          }
        }
        return PR_TRUE;
      }
    }
    else if (!pfd->GetFlag(PFD_ISTEXTFRAME) &&
             !pfd->GetFlag(PFD_ISPLACEHOLDERFRAME)) {
      // If we hit a frame on the end that's not text and not a placeholder,
      // then there is no trailing whitespace to trim. Stop the search.
      *aDeltaWidth = 0;
      return PR_TRUE;
    }
    else if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME)) {
      nscoord deltaWidth = 0;
      PRBool lastCharIsJustifiable = PR_FALSE;
      pfd->mFrame->TrimTrailingWhiteSpace(mPresContext,
                                          *mBlockReflowState->rendContext,
                                          deltaWidth,
                                          lastCharIsJustifiable);
#ifdef NOISY_TRIM
      nsFrame::ListTag(stdout, (psd == mRootSpan
                                ? mBlockReflowState->frame
                                : psd->mFrame->mFrame));
      printf(": trim of ");
      nsFrame::ListTag(stdout, pfd->mFrame);
      printf(" returned %d\n", deltaWidth);
#endif
      if (lastCharIsJustifiable && pfd->mJustificationNumSpaces > 0) {
        pfd->mJustificationNumSpaces--;
      }

      if (deltaWidth) {
        pfd->mBounds.width -= deltaWidth;
        if (0 == pfd->mBounds.width) {
          pfd->mMaxElementWidth = 0;
        }

        // See if the text frame has already been placed in its parent
        if (psd != mRootSpan) {
          // The frame was already placed during psd's
          // reflow. Update the frames rectangle now.
          pfd->mFrame->SetRect(pfd->mBounds);
        }

        // Adjust containing span's right edge
        psd->mX -= deltaWidth;

        // Slide any frames that follow the text frame over by the
        // right amount. The only thing that can follow the text
        // frame is empty stuff, so we are just making things
        // sensible (keeping the combined area honest).
        while (pfd->mNext) {
          pfd = pfd->mNext;
          pfd->mBounds.x -= deltaWidth;
        }
      }

      // Pass up to caller so they can shrink their span
      *aDeltaWidth = deltaWidth;
      return PR_TRUE;
    }
    pfd = pfd->mPrev;
  }

  *aDeltaWidth = 0;
  return PR_FALSE;
}

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void nsLineLayout::UpdateBand ( nscoord  aX,
nscoord  aY,
nscoord  aWidth,
nscoord  aHeight,
PRBool  aPlacedLeftFloat,
nsIFrame aFloatFrame 
)

Definition at line 378 of file nsLineLayout.cpp.

{
#ifdef REALLY_NOISY_REFLOW
  printf("nsLL::UpdateBand %d, %d, %d, %d, frame=%p placedLeft=%s\n  will set mImpacted to PR_TRUE\n",
         aX, aY, aWidth, aHeight, aFloatFrame, aPlacedLeftFloat?"true":"false");
#endif
  PerSpanData* psd = mRootSpan;
  NS_PRECONDITION(psd->mX == psd->mLeftEdge, "update-band called late");
#ifdef DEBUG
  if ((aWidth != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aWidth)) {
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": UpdateBand: bad caller: width WAS %d(0x%x)\n",
           aWidth, aWidth);
  }
  if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
    nsFrame::ListTag(stdout, mBlockReflowState->frame);
    printf(": UpdateBand: bad caller: height WAS %d(0x%x)\n",
           aHeight, aHeight);
  }
#endif

  // Compute the difference between last times width and the new width
  nscoord deltaWidth = 0;
  if (NS_UNCONSTRAINEDSIZE != psd->mRightEdge) {
    NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aWidth, "switched constraints");
    nscoord oldWidth = psd->mRightEdge - psd->mLeftEdge;
    deltaWidth = aWidth - oldWidth;
  }
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowState->frame);
  printf(": UpdateBand: %d,%d,%d,%d deltaWidth=%d %s float\n",
         aX, aY, aWidth, aHeight, deltaWidth,
         aPlacedLeftFloat ? "left" : "right");
#endif

  psd->mLeftEdge = aX;
  psd->mX = aX;
  if (NS_UNCONSTRAINEDSIZE == aWidth) {
    psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
  }
  else {
    psd->mRightEdge = aX + aWidth;
  }
  mTopEdge = aY;
  SetFlag(LL_UPDATEDBAND, PR_TRUE);
  mPlacedFloats |= (aPlacedLeftFloat ? PLACED_LEFT : PLACED_RIGHT);
  SetFlag(LL_IMPACTEDBYFLOATS, PR_TRUE);

  SetFlag(LL_LASTFLOATWASLETTERFRAME,
          nsLayoutAtoms::letterFrame == aFloatFrame->GetType());

  // Now update all of the open spans...
  mRootSpan->mContainsFloat = PR_TRUE;              // make sure mRootSpan gets updated too
  psd = mCurrentSpan;
  while (psd != mRootSpan) {
    NS_ASSERTION(nsnull != psd, "null ptr");
    if (nsnull == psd) {
      break;
    }
    NS_ASSERTION(psd->mX == psd->mLeftEdge, "bad float placement");
    if (NS_UNCONSTRAINEDSIZE == aWidth) {
      psd->mRightEdge = NS_UNCONSTRAINEDSIZE;
    }
    else {
      psd->mRightEdge += deltaWidth;
    }
    psd->mContainsFloat = PR_TRUE;
#ifdef NOISY_REFLOW
    printf("  span %p: oldRightEdge=%d newRightEdge=%d\n",
           psd, psd->mRightEdge - deltaWidth, psd->mRightEdge);
#endif
    psd = psd->mParent;
  }
}

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Definition at line 461 of file nsLineLayout.cpp.

{
  NS_ASSERTION(nsnull != mRootSpan, "UpdateFrames with no active spans");

  PerSpanData* psd = mRootSpan;
  if (PLACED_LEFT & mPlacedFloats) {
    PerFrameData* pfd = psd->mFirstFrame;
    while (nsnull != pfd) {
      pfd->mBounds.x = psd->mX;
      pfd = pfd->mNext;
    }
  }
}

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Definition at line 1917 of file nsLineLayout.cpp.

{
  // Get parent frame info
  PerFrameData* spanFramePFD = psd->mFrame;
  nsIFrame* spanFrame = spanFramePFD->mFrame;

  // Get the parent frame's font for all of the frames in this span
  nsStyleContext* styleContext = spanFrame->GetStyleContext();
  nsIRenderingContext* rc = mBlockReflowState->rendContext;
  SetFontFromStyle(mBlockReflowState->rendContext, styleContext);
  nsCOMPtr<nsIFontMetrics> fm;
  rc->GetFontMetrics(*getter_AddRefs(fm));

  PRBool preMode = (mStyleText->mWhiteSpace == NS_STYLE_WHITESPACE_PRE) ||
    (mStyleText->mWhiteSpace == NS_STYLE_WHITESPACE_MOZ_PRE_WRAP);

  // See if the span is an empty continuation. It's an empty continuation iff:
  // - it has a prev-in-flow
  // - it has no next in flow
  // - it's zero sized
  nsIFrame* spanNextInFlow = spanFrame->GetNextInFlow();
  nsIFrame* spanPrevInFlow = spanFrame->GetPrevInFlow();
  PRBool emptyContinuation = spanPrevInFlow && !spanNextInFlow &&
    (0 == spanFramePFD->mBounds.width) && (0 == spanFramePFD->mBounds.height);

#ifdef NOISY_VERTICAL_ALIGN
  printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
  nsFrame::ListTag(stdout, spanFrame);
  printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s",
         preMode ? "yes" : "no",
         InStrictMode() ? "yes" : "no",
         spanFramePFD->mBounds.width, spanFramePFD->mBounds.height,
         emptyContinuation ? "yes" : "no");
  if (psd != mRootSpan) {
    printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
           spanFramePFD->mBorderPadding.top,
           spanFramePFD->mBorderPadding.right,
           spanFramePFD->mBorderPadding.bottom,
           spanFramePFD->mBorderPadding.left,
           spanFramePFD->mMargin.top,
           spanFramePFD->mMargin.right,
           spanFramePFD->mMargin.bottom,
           spanFramePFD->mMargin.left);
  }
  printf("\n");
#endif

  // Compute the span's mZeroEffectiveSpanBox flag. What we are trying
  // to determine is how we should treat the span: should it act
  // "normally" according to css2 or should it effectively
  // "disappear".
  //
  // In general, if the document being processed is in full standards
  // mode then it should act normally (with one exception). The
  // exception case is when a span is continued and yet the span is
  // empty (e.g. compressed whitespace). For this kind of span we treat
  // it as if it were not there so that it doesn't impact the
  // line-height.
  //
  // In almost standards mode or quirks mode, we should sometimes make
  // it disappear. The cases that matter are those where the span
  // contains no real text elements that would provide an ascent and
  // descent and height. However, if css style elements have been
  // applied to the span (border/padding/margin) so that it's clear the
  // document author is intending css2 behavior then we act as if strict
  // mode is set.
  //
  // This code works correctly for preMode, because a blank line
  // in PRE mode is encoded as a text node with a LF in it, since
  // text nodes with only whitespace are considered in preMode.
  //
  // Much of this logic is shared with the various implementations of
  // nsIFrame::IsEmpty since they need to duplicate the way it makes
  // some lines empty.  However, nsIFrame::IsEmpty can't be reused here
  // since this code sets zeroEffectiveSpanBox even when there are
  // non-empty children.
  PRBool zeroEffectiveSpanBox = PR_FALSE;
  // XXXldb If we really have empty continuations, then all these other
  // checks don't make sense for them.
  // XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that
  // it agrees with this code.  (If it doesn't agree, it probably should.)
  if ((emptyContinuation || mCompatMode != eCompatibility_FullStandards) &&
      ((psd == mRootSpan) ||
       ((0 == spanFramePFD->mBorderPadding.top) &&
        (0 == spanFramePFD->mBorderPadding.right) &&
        (0 == spanFramePFD->mBorderPadding.bottom) &&
        (0 == spanFramePFD->mBorderPadding.left) &&
        (0 == spanFramePFD->mMargin.top) &&
        (0 == spanFramePFD->mMargin.right) &&
        (0 == spanFramePFD->mMargin.bottom) &&
        (0 == spanFramePFD->mMargin.left)))) {
    // This code handles an issue with compatability with non-css
    // conformant browsers. In particular, there are some cases
    // where the font-size and line-height for a span must be
    // ignored and instead the span must *act* as if it were zero
    // sized. In general, if the span contains any non-compressed
    // text then we don't use this logic.
    // However, this is not propagated outwards, since (in compatibility
    // mode) we don't want big line heights for things like
    // <p><font size="-1">Text</font></p>

    // We shouldn't include any whitespace that collapses, unless we're
    // preformatted (in which case it shouldn't, but the width=0 test is
    // perhaps incorrect).  This includes whitespace at the beginning of
    // a line and whitespace preceded (?) by other whitespace.
    // See bug 134580 and bug 155333.
    zeroEffectiveSpanBox = PR_TRUE;
    for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
      if (pfd->GetFlag(PFD_ISTEXTFRAME) &&
          (pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME) || preMode ||
           pfd->mBounds.width != 0)) {
        zeroEffectiveSpanBox = PR_FALSE;
        break;
      }
    }
  }
  psd->mZeroEffectiveSpanBox = zeroEffectiveSpanBox;

  // Setup baselineY, minY, and maxY
  nscoord baselineY, minY, maxY;
  if (psd == mRootSpan) {
    // Use a zero baselineY since we don't yet know where the baseline
    // will be (until we know how tall the line is; then we will
    // know). In addition, use extreme values for the minY and maxY
    // values so that only the child frames will impact their values
    // (since these are children of the block, there is no span box to
    // provide initial values).
    baselineY = 0;
    minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
    maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
#ifdef NOISY_VERTICAL_ALIGN
    printf("[RootSpan]");
    nsFrame::ListTag(stdout, spanFrame);
    printf(": pass1 valign frames: topEdge=%d minLineHeight=%d zeroEffectiveSpanBox=%s\n",
           mTopEdge, mMinLineHeight,
           zeroEffectiveSpanBox ? "yes" : "no");
#endif
  }
  else {
    // Compute the logical height for this span. The logical height
    // is based on the line-height value, not the font-size. Also
    // compute the top leading.
    nscoord logicalHeight =
      nsHTMLReflowState::CalcLineHeight(mPresContext, rc, spanFrame);
    nscoord contentHeight = spanFramePFD->mBounds.height -
      spanFramePFD->mBorderPadding.top - spanFramePFD->mBorderPadding.bottom;

    // Special-case for a ::first-letter frame, set the line height to
    // the frame height if the user has left line-height == normal 
    if (spanFramePFD->GetFlag(PFD_ISLETTERFRAME) && !spanPrevInFlow &&
        spanFrame->GetStyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal) {
      logicalHeight = spanFramePFD->mBounds.height;
    }

    nscoord leading = logicalHeight - contentHeight;
    psd->mTopLeading = leading / 2;
    psd->mBottomLeading = leading - psd->mTopLeading;
    psd->mLogicalHeight = logicalHeight;

    if (zeroEffectiveSpanBox) {
      // When the span-box is to be ignored, zero out the initial
      // values so that the span doesn't impact the final line
      // height. The contents of the span can impact the final line
      // height.

      // Note that things are readjusted for this span after its children
      // are reflowed
      minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
      maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
    }
    else {

      // The initial values for the min and max Y values are in the spans
      // coordinate space, and cover the logical height of the span. If
      // there are child frames in this span that stick out of this area
      // then the minY and maxY are updated by the amount of logical
      // height that is outside this range.
      minY = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
      maxY = minY + psd->mLogicalHeight;
    }

    // This is the distance from the top edge of the parents visual
    // box to the baseline. The span already computed this for us,
    // so just use it.
    baselineY = spanFramePFD->mAscent;


#ifdef NOISY_VERTICAL_ALIGN
    printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
    nsFrame::ListTag(stdout, spanFrame);
    printf(": baseLine=%d logicalHeight=%d topLeading=%d h=%d bp=%d,%d zeroEffectiveSpanBox=%s\n",
           baselineY, psd->mLogicalHeight, psd->mTopLeading,
           spanFramePFD->mBounds.height,
           spanFramePFD->mBorderPadding.top, spanFramePFD->mBorderPadding.bottom,
           zeroEffectiveSpanBox ? "yes" : "no");
#endif
  }

  nscoord maxTopBoxHeight = 0;
  nscoord maxBottomBoxHeight = 0;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nsnull != pfd) {
    nsIFrame* frame = pfd->mFrame;

    // sanity check (see bug 105168, non-reproducable crashes from null frame)
    NS_ASSERTION(frame, "null frame in PerFrameData - something is very very bad");
    if (!frame) {
      return;
    }

    // Compute the logical height of the frame
    nscoord logicalHeight;
    nscoord topLeading;
    PerSpanData* frameSpan = pfd->mSpan;
    if (frameSpan) {
      // For span frames the logical-height and top-leading was
      // pre-computed when the span was reflowed.
      logicalHeight = frameSpan->mLogicalHeight;
      topLeading = frameSpan->mTopLeading;
    }
    else {
      // For other elements the logical height is the same as the
      // frames height plus its margins.
      logicalHeight = pfd->mBounds.height + pfd->mMargin.top +
        pfd->mMargin.bottom;
      topLeading = 0;
    }

    // Get vertical-align property
    const nsStyleTextReset* textStyle = frame->GetStyleTextReset();
    nsStyleUnit verticalAlignUnit = textStyle->mVerticalAlign.GetUnit();
#ifdef NOISY_VERTICAL_ALIGN
    printf("  [frame]");
    nsFrame::ListTag(stdout, frame);
    printf(": verticalAlignUnit=%d (enum == %d)\n",
           verticalAlignUnit,
           ((eStyleUnit_Enumerated == verticalAlignUnit)
            ? textStyle->mVerticalAlign.GetIntValue()
            : -1));
#endif

    PRUint8 verticalAlignEnum;
    nscoord parentAscent, parentDescent, parentXHeight;
    nscoord parentSuperscript, parentSubscript;
    nscoord coordOffset, percentOffset, elementLineHeight;
    nscoord revisedBaselineY;
    switch (verticalAlignUnit) {
      case eStyleUnit_Enumerated:
      default:
        if (eStyleUnit_Enumerated == verticalAlignUnit) {
          verticalAlignEnum = textStyle->mVerticalAlign.GetIntValue();
        }
        else {
          verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_BASELINE;
        }
        switch (verticalAlignEnum) {
          default:
          case NS_STYLE_VERTICAL_ALIGN_BASELINE:
            // The elements baseline is aligned with the baseline of
            // the parent.
            if (frameSpan) {
              // XXX explain
              pfd->mBounds.y = baselineY - pfd->mAscent;
            }
            else {
              // For non-span elements the borders, padding and
              // margins are significant. Use the visual box height
              // and the bottom margin as the distance off of the
              // baseline.
              pfd->mBounds.y = baselineY - pfd->mAscent - pfd->mMargin.bottom;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_SUB:
            // Lower the baseline of the box to the subscript offset
            // of the parent's box. This is identical to the baseline
            // alignment except for the addition of the subscript
            // offset to the baseline Y.
            fm->GetSubscriptOffset(parentSubscript);
            revisedBaselineY = baselineY + parentSubscript;
            if (frameSpan) {
              pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
            }
            else {
              pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
                pfd->mMargin.bottom;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_SUPER:
            // Raise the baseline of the box to the superscript offset
            // of the parent's box. This is identical to the baseline
            // alignment except for the subtraction of the superscript
            // offset to the baseline Y.
            fm->GetSuperscriptOffset(parentSuperscript);
            revisedBaselineY = baselineY - parentSuperscript;
            if (frameSpan) {
              pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
            }
            else {
              pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
                pfd->mMargin.bottom;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_TOP:
            pfd->mVerticalAlign = VALIGN_TOP;
            if (logicalHeight > maxTopBoxHeight) {
              maxTopBoxHeight = logicalHeight;
            }
            break;

          case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
            pfd->mVerticalAlign = VALIGN_BOTTOM;
            if (logicalHeight > maxBottomBoxHeight) {
              maxBottomBoxHeight = logicalHeight;
            }
            break;

          case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
            // Align the midpoint of the frame with 1/2 the parents
            // x-height above the baseline.
            fm->GetXHeight(parentXHeight);
            if (frameSpan) {
              pfd->mBounds.y = baselineY -
                (parentXHeight + pfd->mBounds.height)/2;
            }
            else {
              pfd->mBounds.y = baselineY - (parentXHeight + logicalHeight)/2 +
                pfd->mMargin.top;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
            // The top of the logical box is aligned with the top of
            // the parent elements text.
            fm->GetMaxAscent(parentAscent);
            if (frameSpan) {
              pfd->mBounds.y = baselineY - parentAscent -
                pfd->mBorderPadding.top + frameSpan->mTopLeading;
            }
            else {
              pfd->mBounds.y = baselineY - parentAscent + pfd->mMargin.top;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
            // The bottom of the logical box is aligned with the
            // bottom of the parent elements text.
            fm->GetMaxDescent(parentDescent);
            if (frameSpan) {
              pfd->mBounds.y = baselineY + parentDescent -
                pfd->mBounds.height + pfd->mBorderPadding.bottom -
                frameSpan->mBottomLeading;
            }
            else {
              pfd->mBounds.y = baselineY + parentDescent -
                pfd->mBounds.height - pfd->mMargin.bottom;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;

          case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE:
            // Align the midpoint of the frame with the baseline of the parent.
            if (frameSpan) {
              pfd->mBounds.y = baselineY - pfd->mBounds.height/2;
            }
            else {
              pfd->mBounds.y = baselineY - logicalHeight/2 + pfd->mMargin.top;
            }
            pfd->mVerticalAlign = VALIGN_OTHER;
            break;       
        }
        break;

      case eStyleUnit_Coord:
        // According to the CSS2 spec (10.8.1), a positive value
        // "raises" the box by the given distance while a negative value
        // "lowers" the box by the given distance (with zero being the
        // baseline). Since Y coordinates increase towards the bottom of
        // the screen we reverse the sign.
        coordOffset = textStyle->mVerticalAlign.GetCoordValue();
        revisedBaselineY = baselineY - coordOffset;
        if (frameSpan) {
          pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
        }
        else {
          pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
            pfd->mMargin.bottom;
        }
        pfd->mVerticalAlign = VALIGN_OTHER;
        break;

      case eStyleUnit_Percent:
        // Similar to a length value (eStyleUnit_Coord) except that the
        // percentage is a function of the elements line-height value.
        elementLineHeight =
          nsHTMLReflowState::CalcLineHeight(mPresContext, rc, frame);
        percentOffset = nscoord(
          textStyle->mVerticalAlign.GetPercentValue() * elementLineHeight
          );
        revisedBaselineY = baselineY - percentOffset;
        if (frameSpan) {
          pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
        }
        else {
          pfd->mBounds.y = revisedBaselineY - pfd->mAscent -
            pfd->mMargin.bottom;
        }
        pfd->mVerticalAlign = VALIGN_OTHER;
        break;
    }

    // Update minY/maxY for frames that we just placed. Do not factor
    // text into the equation.
    if (pfd->mVerticalAlign == VALIGN_OTHER) {
      // Text frames do not contribute to the min/max Y values for the
      // line (instead their parent frame's font-size contributes).
      // XXXrbs -- relax this restriction because it causes text frames
      //           to jam together when 'font-size-adjust' is enabled
      //           and layout is using dynamic font heights (bug 20394)
      //        -- Note #1: With this code enabled and with the fact that we are not
      //           using Em[Ascent|Descent] as nsDimensions for text metrics in
      //           GFX mean that the discussion in bug 13072 cannot hold.
      //        -- Note #2: We still don't want empty-text frames to interfere.
      //           For example in quirks mode, avoiding empty text frames prevents
      //           "tall" lines around elements like <hr> since the rules of <hr>
      //           in quirks.css have pseudo text contents with LF in them.
#if 0
      if (!pfd->GetFlag(PFD_ISTEXTFRAME)) {
#else
      // Only consider non empty text frames when line-height=normal
      PRBool canUpdate = !pfd->GetFlag(PFD_ISTEXTFRAME);
      if (!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) {
        nsStyleUnit lhUnit = frame->GetStyleText()->mLineHeight.GetUnit();
        canUpdate = lhUnit == eStyleUnit_Normal || lhUnit == eStyleUnit_Null;
      }
      if (canUpdate) {
#endif
        nscoord yTop, yBottom;
        if (frameSpan) {
          // For spans that were are now placing, use their position
          // plus their already computed min-Y and max-Y values for
          // computing yTop and yBottom.
          yTop = pfd->mBounds.y + frameSpan->mMinY;
          yBottom = pfd->mBounds.y + frameSpan->mMaxY;
        }
        else {
          yTop = pfd->mBounds.y - pfd->mMargin.top;
          yBottom = yTop + logicalHeight;
        }
        if (!preMode &&
            GetCompatMode() != eCompatibility_FullStandards &&
            !logicalHeight) {
          // Check if it's a BR frame that is not alone on its line (it
          // is given a height of zero to indicate this), and if so reset
          // yTop and yBottom so that BR frames don't influence the line.
          if (nsLayoutAtoms::brFrame == frame->GetType()) {
            yTop = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
            yBottom = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
          }
        }
        if (yTop < minY) minY = yTop;
        if (yBottom > maxY) maxY = yBottom;
#ifdef NOISY_VERTICAL_ALIGN
        printf("     [frame]raw: a=%d d=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minY=%d maxY=%d\n",
               pfd->mAscent, pfd->mDescent, pfd->mBounds.height,
               pfd->mBorderPadding.top, pfd->mBorderPadding.bottom,
               logicalHeight,
               pfd->mSpan ? topLeading : 0,
               pfd->mBounds.y, minY, maxY);
#endif
      }
      if (psd != mRootSpan) {
        frame->SetRect(pfd->mBounds);
      }
    }
    pfd = pfd->mNext;
  }

  // Factor in the minimum line-height when handling the root-span for
  // the block.
  if (psd == mRootSpan) {
    // We should factor in the block element's minimum line-height (as
    // defined in section 10.8.1 of the css2 spec) assuming that
    // mZeroEffectiveSpanBox is not set on the root span.  This only happens
    // in some cases in quirks mode:
    //  (1) if the root span contains non-whitespace text directly (this
    //      is handled by mZeroEffectiveSpanBox
    //  (2) if this is the first line of an LI element (whether or not
    //      there is a bullet (NN4/IE5 quirk)
    //  (3) if this is the last line of an LI, DT, or DD element
    //      (The last line before a block also counts, but not before a
    //      BR) (NN4/IE5 quirk)
    PRBool applyMinLH = !(psd->mZeroEffectiveSpanBox); // (1) above
    PRBool isFirstLine = !mLineNumber; // if the line number is 0
    PRBool isLastLine = (!mLineBox->IsLineWrapped() && !GetFlag(LL_LINEENDSINBR));
    PRBool foundLI = PR_FALSE;  // hack to fix bug 50480.
    //XXX: rather than remembering if we've found an LI, we really should be checking
    //     for the existence of a bullet frame.  Likewise, the code below should not
    //     be checking for any particular content tag type, but rather should
    //     be checking for the existence of a bullet frame to determine if it's a list element or not.
    if (!applyMinLH && (isFirstLine || isLastLine)) {
      nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
      if (blockContent) {
        nsIAtom *blockTagAtom = blockContent->Tag();
        // (2) above, if the first line of LI
        if (isFirstLine && blockTagAtom == nsHTMLAtoms::li) {
          // if the line is empty, then don't force the min height
          // (see bug 75963)
          if (!IsZeroHeight()) {
            applyMinLH = PR_TRUE;
            foundLI = PR_TRUE;
          }
        }
        // (3) above, if the last line of LI, DT, or DD
        else if (!applyMinLH && isLastLine &&
                 ((blockTagAtom == nsHTMLAtoms::li) ||
                  (blockTagAtom == nsHTMLAtoms::dt) ||
                  (blockTagAtom == nsHTMLAtoms::dd))) {
          applyMinLH = PR_TRUE;
        }
      }
    }
    if (applyMinLH) {
      if ((psd->mX != psd->mLeftEdge) || preMode || foundLI) {
#ifdef NOISY_VERTICAL_ALIGN
        printf("  [span]==> adjusting min/maxY: currentValues: %d,%d", minY, maxY);
#endif
        nscoord minimumLineHeight = mMinLineHeight;
        nscoord fontAscent, fontHeight;
        fm->GetMaxAscent(fontAscent);
        fm->GetHeight(fontHeight);

        nscoord leading = minimumLineHeight - fontHeight;
        nscoord yTop = -fontAscent - leading/2;
        nscoord yBottom = yTop + minimumLineHeight;
        if (yTop < minY) minY = yTop;
        if (yBottom > maxY) maxY = yBottom;

#ifdef NOISY_VERTICAL_ALIGN
        printf(" new values: %d,%d\n", minY, maxY);
#endif
      }
      else {
        // XXX issues:
        // [1] BR's on empty lines stop working
        // [2] May not honor css2's notion of handling empty elements
        // [3] blank lines in a pre-section ("\n") (handled with preMode)

        // XXX Are there other problems with this?
#ifdef NOISY_VERTICAL_ALIGN
        printf("  [span]==> zapping min/maxY: currentValues: %d,%d newValues: 0,0\n",
               minY, maxY);
#endif
        minY = maxY = 0;
      }
    }
  }

  if ((minY == VERTICAL_ALIGN_FRAMES_NO_MINIMUM) ||
      (maxY == VERTICAL_ALIGN_FRAMES_NO_MINIMUM)) {
    minY = maxY = baselineY;
  }

  if ((psd != mRootSpan) && (psd->mZeroEffectiveSpanBox)) {
#ifdef NOISY_VERTICAL_ALIGN
    printf("   [span]adjusting for zeroEffectiveSpanBox\n");
    printf("     Original: minY=%d, maxY=%d, height=%d, ascent=%d, descent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
           minY, maxY, spanFramePFD->mBounds.height,
           spanFramePFD->mAscent, spanFramePFD->mDescent,
           psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
#endif
    nscoord goodMinY = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
    nscoord goodMaxY = goodMinY + psd->mLogicalHeight;
    if (minY > goodMinY) {
      nscoord adjust = minY - goodMinY; // positive

      // shrink the logical extents
      psd->mLogicalHeight -= adjust;
      psd->mTopLeading -= adjust;
    }
    if (maxY < goodMaxY) {
      nscoord adjust = goodMaxY - maxY;
      psd->mLogicalHeight -= adjust;
      psd->mBottomLeading -= adjust;
    }
    if (minY > 0) {

      // shrink the content by moving its top down.  This is tricky, since
      // the top is the 0 for many coordinates, so what we do is
      // move everything else up.
      spanFramePFD->mAscent -= minY; // move the baseline up
      spanFramePFD->mBounds.height -= minY; // move the bottom up
      psd->mTopLeading += minY;

      pfd = psd->mFirstFrame;
      while (nsnull != pfd) {
        pfd->mBounds.y -= minY; // move all the children back up
        pfd->mFrame->SetRect(pfd->mBounds);
        pfd = pfd->mNext;
      }
      maxY -= minY; // since minY is in the frame's own coordinate system
      minY = 0;
    }
    if (maxY < spanFramePFD->mBounds.height) {
      nscoord adjust = spanFramePFD->mBounds.height - maxY;
      spanFramePFD->mBounds.height -= adjust; // move the bottom up
      spanFramePFD->mDescent -= adjust;
      psd->mBottomLeading += adjust;
    }
#ifdef NOISY_VERTICAL_ALIGN
    printf("     New: minY=%d, maxY=%d, height=%d, ascent=%d, descent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
           minY, maxY, spanFramePFD->mBounds.height,
           spanFramePFD->mAscent, spanFramePFD->mDescent,
           psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
#endif
  }

  psd->mMinY = minY;
  psd->mMaxY = maxY;
#ifdef NOISY_VERTICAL_ALIGN
  printf("  [span]==> minY=%d maxY=%d delta=%d maxTopBoxHeight=%d maxBottomBoxHeight=%d\n",
         minY, maxY, maxY - minY, maxTopBoxHeight, maxBottomBoxHeight);
#endif
  if (maxTopBoxHeight > mMaxTopBoxHeight) {
    mMaxTopBoxHeight = maxTopBoxHeight;
  }
  if (maxBottomBoxHeight > mMaxBottomBoxHeight) {
    mMaxBottomBoxHeight = maxBottomBoxHeight;
  }
}

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void nsLineLayout::VerticalAlignLine ( nsLineBox aLineBox,
nscoord aMaxElementWidthResult 
)

Definition at line 1618 of file nsLineLayout.cpp.

{
  // Synthesize a PerFrameData for the block frame
  PerFrameData rootPFD;
  rootPFD.mFrame = mBlockReflowState->frame;
  rootPFD.mFrameType = mBlockReflowState->mFrameType;
  rootPFD.mAscent = 0;
  rootPFD.mDescent = 0;
  mRootSpan->mFrame = &rootPFD;
  mLineBox = aLineBox;

  // Partially place the children of the block frame. The baseline for
  // this operation is set to zero so that the y coordinates for all
  // of the placed children will be relative to there.
  PerSpanData* psd = mRootSpan;
  VerticalAlignFrames(psd);

  // Compute the line-height. The line-height will be the larger of:
  //
  // [1] maxY - minY (the distance between the highest childs top edge
  // and the lowest childs bottom edge)
  //
  // [2] the maximum logical box height (since not every frame may have
  // participated in #1; for example: top/bottom aligned frames)
  //
  // [3] the minimum line height (line-height property set on the
  // block frame)
  nscoord lineHeight = psd->mMaxY - psd->mMinY;

  // Now that the line-height is computed, we need to know where the
  // baseline is in the line. Position baseline so that mMinY is just
  // inside the top of the line box.
  nscoord baselineY;
  if (psd->mMinY < 0) {
    baselineY = mTopEdge - psd->mMinY;
  }
  else {
    baselineY = mTopEdge;
  }

  // It's also possible that the line-height isn't tall enough because
  // of top/bottom aligned elements that were not accounted for in
  // min/max Y.
  //
  // The CSS2 spec doesn't really say what happens when to the
  // baseline in this situations. What we do is if the largest top
  // aligned box height is greater than the line-height then we leave
  // the baseline alone. If the largest bottom aligned box is greater
  // than the line-height then we slide the baseline down by the extra
  // amount.
  //
  // Navigator 4 gives precedence to the first top/bottom aligned
  // object.  We just let bottom aligned objects win.
  if (lineHeight < mMaxBottomBoxHeight) {
    // When the line is shorter than the maximum top aligned box
    nscoord extra = mMaxBottomBoxHeight - lineHeight;
    baselineY += extra;
    lineHeight = mMaxBottomBoxHeight;
  }
  if (lineHeight < mMaxTopBoxHeight) {
    lineHeight = mMaxTopBoxHeight;
  }
#ifdef NOISY_VERTICAL_ALIGN
  printf("  [line]==> lineHeight=%d baselineY=%d\n", lineHeight, baselineY);
#endif

  // Now position all of the frames in the root span. We will also
  // recurse over the child spans and place any top/bottom aligned
  // frames we find.
  // XXX PERFORMANCE: set a bit per-span to avoid the extra work
  // (propagate it upward too)
  PerFrameData* pfd = psd->mFirstFrame;
  nscoord maxElementWidth = 0;
  PRBool prevFrameAccumulates = PR_FALSE;
  nscoord accumulatedWidth = 0;
#ifdef HACK_MEW
  PRBool strictMode = InStrictMode();
  PRBool inUnconstrainedTable = InUnconstrainedTableCell(*mBlockReflowState);
#endif
#ifdef DEBUG
  int frameCount = 0;
#endif

  nscoord indent = mTextIndent; // Used for the first frame.

  while (nsnull != pfd) {

    // Compute max-element-width if necessary
    if (mComputeMaxElementWidth) {

      nscoord mw = pfd->mMaxElementWidth + indent;
      // add only fixed margins to the MEW
      if (pfd->mMargin.left) {
        if (pfd->mFrame->GetStyleMargin()->mMargin.GetLeftUnit() ==
            eStyleUnit_Coord)
          mw += pfd->mMargin.left;
      }
      if (pfd->mMargin.right) {
        if (pfd->mFrame->GetStyleMargin()->mMargin.GetRightUnit() ==
            eStyleUnit_Coord)
          mw += pfd->mMargin.right;
      }

      // Zero |indent| after including the 'text-indent' only for the
      // frame that is indented.
      indent = 0;

      if (psd->mNoWrap) {
        maxElementWidth += mw;
      }
      else {

#ifdef HACK_MEW

#ifdef DEBUG
      if (nsBlockFrame::gNoisyMaxElementWidth) 
        frameCount++;
#endif
        // if in Quirks mode and in a table cell with an unconstrained width, then emulate an IE
        // quirk to keep consecutive images from breaking the line
        // - see bugs 54565, 32191, and their many dups
        // XXX - reconsider how textFrame text measurement happens and have it take into account
        //       image frames as well, thus eliminating the need for this code
        if (!strictMode && inUnconstrainedTable ) {

          nscoord imgSizes = AccumulateImageSizes(*mPresContext, *pfd->mFrame);
          PRBool curFrameAccumulates = (imgSizes > 0) || 
                                       (pfd->mMaxElementWidth == pfd->mBounds.width &&
                                        pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME));
            // NOTE: we check for the maxElementWidth == the boundsWidth to detect when
            //       a textframe has whitespace in it and thus should not be used as the basis
            //       for accumulating the image width
            // - this is to handle images in a text run

          if(prevFrameAccumulates && curFrameAccumulates) {
            accumulatedWidth += mw;
          } else {
            accumulatedWidth = mw;
          } 
          // now update the prevFrame
          prevFrameAccumulates = curFrameAccumulates;
        
#ifdef DEBUG
          if (nsBlockFrame::gNoisyMaxElementWidth) {
            nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
            printf("(%d) last frame's MEW=%d | Accumulated MEW=%d\n", frameCount, mw, accumulatedWidth);
          }
#endif 

          mw = accumulatedWidth;
        }

#endif // HACK_MEW

        // and finally reset the max element width
        if (maxElementWidth < mw) {
          maxElementWidth = mw;
        }
      }
    }
    PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
    NS_ASSERTION(0xFF != pfd->mVerticalAlign, "umr");
#endif
    switch (pfd->mVerticalAlign) {
      case VALIGN_TOP:
        if (span) {
          pfd->mBounds.y = mTopEdge - pfd->mBorderPadding.top +
            span->mTopLeading;
        }
        else {
          pfd->mBounds.y = mTopEdge + pfd->mMargin.top;
        }
        break;
      case VALIGN_BOTTOM:
        if (span) {
          // Compute bottom leading
          pfd->mBounds.y = mTopEdge + lineHeight -
            pfd->mBounds.height + pfd->mBorderPadding.bottom -
            span->mBottomLeading;
        }
        else {
          pfd->mBounds.y = mTopEdge + lineHeight - pfd->mMargin.bottom -
            pfd->mBounds.height;
        }
        break;
      case VALIGN_OTHER:
        pfd->mBounds.y += baselineY;
        break;
    }
    pfd->mFrame->SetRect(pfd->mBounds);
#ifdef NOISY_VERTICAL_ALIGN
    printf("  [child of line]");
    nsFrame::ListTag(stdout, pfd->mFrame);
    printf(": y=%d\n", pfd->mBounds.y);
#endif
    if (span) {
      nscoord distanceFromTop = pfd->mBounds.y - mTopEdge;
      PlaceTopBottomFrames(span, distanceFromTop, lineHeight);
    }
    // check to see if the frame is an inline replace element
    // and if it is percent-aware.  If so, mark the line.
    if ((PR_FALSE==aLineBox->ResizeReflowOptimizationDisabled()) &&
         pfd->mFrameType & NS_CSS_FRAME_TYPE_INLINE)
    {
      if (IsPercentageAwareFrame(mPresContext, pfd->mFrame))
        aLineBox->DisableResizeReflowOptimization();
    }
    pfd = pfd->mNext;
  }

  // Fill in returned line-box and max-element-width data
  aLineBox->mBounds.x = psd->mLeftEdge;
  aLineBox->mBounds.y = mTopEdge;
  aLineBox->mBounds.width = psd->mX - psd->mLeftEdge;
  aLineBox->mBounds.height = lineHeight;
  mFinalLineHeight = lineHeight;
  *aMaxElementWidthResult = maxElementWidth;
  aLineBox->SetAscent(baselineY - mTopEdge);
#ifdef NOISY_VERTICAL_ALIGN
  printf(
    "  [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d mew=%d\n",
    aLineBox->mBounds.x, aLineBox->mBounds.y,
    aLineBox->mBounds.width, aLineBox->mBounds.height,
    mFinalLineHeight, aLineBox->GetAscent(),
    *aMaxElementWidthResult);
#endif

  // Undo root-span mFrame pointer to prevent brane damage later on...
  mRootSpan->mFrame = nsnull;
  mLineBox = nsnull;
}

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Friends And Related Function Documentation

friend class nsInlineFrame [friend]

Definition at line 300 of file nsLineLayout.h.

friend struct PerFrameData [friend]

Definition at line 344 of file nsLineLayout.h.

friend struct PerSpanData [friend]

Definition at line 342 of file nsLineLayout.h.


Member Data Documentation

Definition at line 462 of file nsLineLayout.h.

Definition at line 297 of file nsLineLayout.h.

Definition at line 302 of file nsLineLayout.h.

Definition at line 318 of file nsLineLayout.h.

Definition at line 303 of file nsLineLayout.h.

Definition at line 305 of file nsLineLayout.h.

Definition at line 456 of file nsLineLayout.h.

Definition at line 334 of file nsLineLayout.h.

Definition at line 316 of file nsLineLayout.h.

Definition at line 165 of file nsLineLayout.h.

Definition at line 417 of file nsLineLayout.h.

Definition at line 322 of file nsLineLayout.h.

Definition at line 317 of file nsLineLayout.h.

Definition at line 330 of file nsLineLayout.h.

Definition at line 329 of file nsLineLayout.h.

Definition at line 304 of file nsLineLayout.h.

Definition at line 308 of file nsLineLayout.h.

Definition at line 289 of file nsLineLayout.h.

Definition at line 455 of file nsLineLayout.h.

Definition at line 295 of file nsLineLayout.h.

Definition at line 457 of file nsLineLayout.h.

Definition at line 454 of file nsLineLayout.h.

Definition at line 296 of file nsLineLayout.h.

Definition at line 306 of file nsLineLayout.h.

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Definition at line 319 of file nsLineLayout.h.

Definition at line 328 of file nsLineLayout.h.

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Definition at line 325 of file nsLineLayout.h.


The documentation for this class was generated from the following files: