// Only reflow the selected child ...
NS_IMETHODIMP
nsMathMLmactionFrame::Reflow(nsPresContext*          aPresContext,
                             nsHTMLReflowMetrics&     aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus&          aStatus)
{
  nsresult rv = NS_OK;
  aStatus = NS_FRAME_COMPLETE;
  aDesiredSize.width = aDesiredSize.height = 0;
  aDesiredSize.ascent = 0;
  mBoundingMetrics = nsBoundingMetrics();
  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    rv = ReflowChild(childFrame, aPresContext, aDesiredSize,
                     childReflowState, aStatus);
    SaveReflowAndBoundingMetricsFor(childFrame, aDesiredSize,
                                    aDesiredSize.mBoundingMetrics);
    mBoundingMetrics = aDesiredSize.mBoundingMetrics;
  }
  FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return rv;
}
Example #2
0
void
nsMathMLTokenFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
  // initializations needed for empty markup like <mtag></mtag>
  aDesiredSize.Width() = aDesiredSize.Height() = 0;
  aDesiredSize.SetTopAscent(0);
  aDesiredSize.mBoundingMetrics = nsBoundingMetrics();

  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
  nsIFrame* childFrame = GetFirstPrincipalChild();
  while (childFrame) {
    // ask our children to compute their bounding metrics
    nsHTMLReflowMetrics childDesiredSize(aReflowState.GetWritingMode(),
                                         aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    ReflowChild(childFrame, aPresContext, childDesiredSize,
                childReflowState, aStatus);
    //NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
    SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                    childDesiredSize.mBoundingMetrics);

    childFrame = childFrame->GetNextSibling();
  }

  // place and size children
  FinalizeReflow(*aReflowState.rendContext, aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
void
nsRubyTextContainerFrame::ReflowRubyTextFrame(
                            nsRubyTextFrame* rtFrame,
                            nsIFrame* rbFrame,
                            nscoord baseStart,
                            nsPresContext* aPresContext,
                            nsHTMLReflowMetrics& aDesiredSize,
                            const nsHTMLReflowState& aReflowState)
{
  nsReflowStatus frameReflowStatus;
  nsHTMLReflowMetrics metrics(aReflowState, aDesiredSize.mFlags);
  mozilla::WritingMode lineWM = mLineLayout->GetWritingMode();
  mozilla::LogicalSize availSize(lineWM, aReflowState.AvailableWidth(),
                   aReflowState.AvailableHeight());
  nsHTMLReflowState childReflowState(aPresContext, aReflowState, rtFrame, availSize);

  // Determine the inline coordinate for the text frame by centering over
  // the corresponding base frame
  int baseWidth;
  if (rbFrame) {
    baseWidth = rbFrame->ISize();

    // If this is the last ruby annotation, it gets paired with ALL remaining
    // ruby bases
    if (!rtFrame->GetNextSibling()) {
      rbFrame = rbFrame->GetNextSibling();
      while (rbFrame) {
        baseWidth += rbFrame->ISize();
        rbFrame = rbFrame->GetNextSibling();
      }
    }
  } else {
    baseWidth = 0;
  }
  
  int baseCenter = baseStart + baseWidth / 2;
  // FIXME: Find a way to avoid using GetPrefISize here, potentially by moving
  // the frame after it has reflowed.
  nscoord ICoord = baseCenter - rtFrame->GetPrefISize(aReflowState.rendContext) / 2;
  if (ICoord > mLineLayout->GetCurrentICoord()) {
    mLineLayout->AdvanceICoord(ICoord - mLineLayout->GetCurrentICoord());
  } 

  bool pushedFrame;
  mLineLayout->ReflowFrame(rtFrame, frameReflowStatus,
                           &metrics, pushedFrame);

  NS_ASSERTION(!pushedFrame, "Ruby line breaking is not yet implemented");

  mISize += metrics.ISize(lineWM);
  rtFrame->SetSize(nsSize(metrics.ISize(lineWM), metrics.BSize(lineWM)));
  FinishReflowChild(rtFrame, aPresContext, metrics, &childReflowState, 0, 0,
                    NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_MOVE_VIEW);
} 
Example #4
0
nsresult
nsMathMLTokenFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
    nsresult rv = NS_OK;

    // initializations needed for empty markup like <mtag></mtag>
    aDesiredSize.width = aDesiredSize.height = 0;
    aDesiredSize.ascent = 0;
    aDesiredSize.mBoundingMetrics = nsBoundingMetrics();

    nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
    nsIFrame* childFrame = GetFirstPrincipalChild();
    while (childFrame) {
        // ask our children to compute their bounding metrics
        nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
                                             | NS_REFLOW_CALC_BOUNDING_METRICS);
        nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                           childFrame, availSize);
        rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
                         childReflowState, aStatus);
        //NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
        if (NS_FAILED(rv)) {
            // Call DidReflow() for the child frames we successfully did reflow.
            DidReflowChildren(GetFirstPrincipalChild(), childFrame);
            return rv;
        }

        SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                        childDesiredSize.mBoundingMetrics);

        childFrame = childFrame->GetNextSibling();
    }


    // place and size children
    FinalizeReflow(*aReflowState.rendContext, aDesiredSize);

    aStatus = NS_FRAME_COMPLETE;
    NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
    return NS_OK;
}
NS_IMETHODIMP
nsMathMLmfencedFrame::Reflow(nsPresContext*          aPresContext,
                             nsHTMLReflowMetrics&     aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus&          aStatus)
{
  nsresult rv;
  aDesiredSize.width = aDesiredSize.height = 0;
  aDesiredSize.ascent = 0;
  aDesiredSize.mBoundingMetrics = nsBoundingMetrics();

  PRInt32 i;
  const nsStyleFont* font = GetStyleFont();
  nsRefPtr<nsFontMetrics> fm;
  nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
  aReflowState.rendContext->SetFont(fm);
  nscoord axisHeight, em;
  GetAxisHeight(*aReflowState.rendContext, fm, axisHeight);
  GetEmHeight(fm, em);
  // leading to be left at the top and the bottom of stretched chars
  nscoord leading = NSToCoordRound(0.2f * em); 

  /////////////
  // Reflow children
  // Asking each child to cache its bounding metrics

  // Note that we don't use the base method nsMathMLContainerFrame::Reflow()
  // because we want to stretch our fences, separators and stretchy frames using
  // the *same* initial aDesiredSize.mBoundingMetrics. If we were to use the base
  // method here, our stretchy frames will be stretched and placed, and we may
  // end up stretching our fences/separators with a different aDesiredSize.
  // XXX The above decision was revisited in bug 121748 and this code can be
  // refactored to use nsMathMLContainerFrame::Reflow() at some stage.

  nsReflowStatus childStatus;
  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
  nsIFrame* firstChild = GetFirstChild(nsnull);
  nsIFrame* childFrame = firstChild;
  nscoord ascent = 0, descent = 0;
  if (firstChild || mOpenChar || mCloseChar || mSeparatorsCount > 0) {
    // We use the ASCII metrics to get our minimum height. This way,
    // if we have borders or a background, they will fit better with
    // other elements on the line.
    ascent = fm->MaxAscent();
    descent = fm->MaxDescent();
  }
  while (childFrame) {
    nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
                     childReflowState, childStatus);
    //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
    if (NS_FAILED(rv)) {
      // Call DidReflow() for the child frames we successfully did reflow.
      DidReflowChildren(firstChild, childFrame);
      return rv;
    }

    SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                    childDesiredSize.mBoundingMetrics);

    nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
    if (descent < childDescent)
      descent = childDescent;
    if (ascent < childDesiredSize.ascent)
      ascent = childDesiredSize.ascent;

    childFrame = childFrame->GetNextSibling();
  }

  /////////////
  // Ask stretchy children to stretch themselves

  nsBoundingMetrics containerSize;
  nsStretchDirection stretchDir = NS_STRETCH_DIRECTION_VERTICAL;

  GetPreferredStretchSize(*aReflowState.rendContext,
                          0, /* i.e., without embellishments */
                          stretchDir, containerSize);
  childFrame = firstChild;
  while (childFrame) {
    nsIMathMLFrame* mathmlChild = do_QueryFrame(childFrame);
    if (mathmlChild) {
      nsHTMLReflowMetrics childDesiredSize;
      // retrieve the metrics that was stored at the previous pass
      GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                     childDesiredSize.mBoundingMetrics);
      
      mathmlChild->Stretch(*aReflowState.rendContext, 
                           stretchDir, containerSize, childDesiredSize);
      // store the updated metrics
      SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                      childDesiredSize.mBoundingMetrics);
      
      nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
      if (descent < childDescent)
        descent = childDescent;
      if (ascent < childDesiredSize.ascent)
        ascent = childDesiredSize.ascent;
    }
    childFrame = childFrame->GetNextSibling();
  }

  // bug 121748: for surrounding fences & separators, use a size that covers everything
  GetPreferredStretchSize(*aReflowState.rendContext,
                          STRETCH_CONSIDER_EMBELLISHMENTS,
                          stretchDir, containerSize);

  //////////////////////////////////////////
  // Prepare the opening fence, separators, and closing fence, and
  // adjust the origin of children.

  // we need to center around the axis
  nscoord delta = NS_MAX(containerSize.ascent - axisHeight, 
                         containerSize.descent + axisHeight);
  containerSize.ascent = delta + axisHeight;
  containerSize.descent = delta - axisHeight;

  /////////////////
  // opening fence ...
  ReflowChar(aPresContext, *aReflowState.rendContext, mOpenChar,
             NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel, 
             axisHeight, leading, em, containerSize, ascent, descent);
  /////////////////
  // separators ...
  for (i = 0; i < mSeparatorsCount; i++) {
    ReflowChar(aPresContext, *aReflowState.rendContext, &mSeparatorsChar[i],
               NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel,
               axisHeight, leading, em, containerSize, ascent, descent);
  }
  /////////////////
  // closing fence ...
  ReflowChar(aPresContext, *aReflowState.rendContext, mCloseChar,
             NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel,
             axisHeight, leading, em, containerSize, ascent, descent);

  //////////////////
  // Adjust the origins of each child.
  // and update our bounding metrics

  i = 0;
  nscoord dx = 0;
  nsBoundingMetrics bm;
  PRBool firstTime = PR_TRUE;
  if (mOpenChar) {
    PlaceChar(mOpenChar, ascent, bm, dx);
    aDesiredSize.mBoundingMetrics = bm;
    firstTime = PR_FALSE;
  }

  childFrame = firstChild;
  while (childFrame) {
    nsHTMLReflowMetrics childSize;
    GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
    if (firstTime) {
      firstTime = PR_FALSE;
      aDesiredSize.mBoundingMetrics  = bm;
    }
    else  
      aDesiredSize.mBoundingMetrics += bm;

    FinishReflowChild(childFrame, aPresContext, nsnull, childSize, 
                      dx, ascent - childSize.ascent, 0);
    dx += childSize.width;

    if (i < mSeparatorsCount) {
      PlaceChar(&mSeparatorsChar[i], ascent, bm, dx);
      aDesiredSize.mBoundingMetrics += bm;
    }
    i++;

    childFrame = childFrame->GetNextSibling();
  }

  if (mCloseChar) {
    PlaceChar(mCloseChar, ascent, bm, dx);
    if (firstTime)
      aDesiredSize.mBoundingMetrics  = bm;
    else  
      aDesiredSize.mBoundingMetrics += bm;
  }

  aDesiredSize.width = aDesiredSize.mBoundingMetrics.width;
  aDesiredSize.height = ascent + descent;
  aDesiredSize.ascent = ascent;

  SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
  SetReference(nsPoint(0, aDesiredSize.ascent));

  // see if we should fix the spacing
  FixInterFrameSpacing(aDesiredSize);

  // Finished with these:
  ClearSavedChildMetrics();

  // Set our overflow area
  GatherAndStoreOverflow(&aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return NS_OK;
}
NS_IMETHODIMP
nsMathMLmrootFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
  nsresult rv = NS_OK;
  nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
  nsReflowStatus childStatus;

  aDesiredSize.width = aDesiredSize.height = 0;
  aDesiredSize.ascent = 0;

  nsBoundingMetrics bmSqr, bmBase, bmIndex;
  nsRenderingContext& renderingContext = *aReflowState.rendContext;

  //////////////////
  // Reflow Children

  PRInt32 count = 0;
  nsIFrame* baseFrame = nsnull;
  nsIFrame* indexFrame = nsnull;
  nsHTMLReflowMetrics baseSize;
  nsHTMLReflowMetrics indexSize;
  nsIFrame* childFrame = mFrames.FirstChild();
  while (childFrame) {
    // ask our children to compute their bounding metrics 
    nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    rv = ReflowChild(childFrame, aPresContext,
                     childDesiredSize, childReflowState, childStatus);
    //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
    if (NS_FAILED(rv)) {
      // Call DidReflow() for the child frames we successfully did reflow.
      DidReflowChildren(mFrames.FirstChild(), childFrame);
      return rv;
    }
    if (0 == count) {
      // base 
      baseFrame = childFrame;
      baseSize = childDesiredSize;
      bmBase = childDesiredSize.mBoundingMetrics;
    }
    else if (1 == count) {
      // index
      indexFrame = childFrame;
      indexSize = childDesiredSize;
      bmIndex = childDesiredSize.mBoundingMetrics;
    }
    count++;
    childFrame = childFrame->GetNextSibling();
  }
  if (2 != count) {
    // report an error, encourage people to get their markups in order
    rv = ReflowError(renderingContext, aDesiredSize);
    aStatus = NS_FRAME_COMPLETE;
    NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
    // Call DidReflow() for the child frames we successfully did reflow.
    DidReflowChildren(mFrames.FirstChild(), childFrame);
    return rv;
  }

  ////////////
  // Prepare the radical symbol and the overline bar

  renderingContext.SetFont(GetStyleFont()->mFont,
                           aPresContext->GetUserFontSet());
  nsFontMetrics* fm = renderingContext.FontMetrics();

  // For radical glyphs from TeX fonts and some of the radical glyphs from
  // Mathematica fonts, the thickness of the overline can be obtained from the
  // ascent of the glyph.  Most fonts however have radical glyphs above the
  // baseline so no assumption can be made about the meaning of the ascent.
  nscoord ruleThickness, leading, em;
  GetRuleThickness(renderingContext, fm, ruleThickness);

  PRUnichar one = '1';
  nsBoundingMetrics bmOne = renderingContext.GetBoundingMetrics(&one, 1);

  // get the leading to be left at the top of the resulting frame
  // this seems more reliable than using fm->GetLeading() on suspicious fonts
  GetEmHeight(fm, em);
  leading = nscoord(0.2f * em); 

  // Rule 11, App. G, TeXbook
  // psi = clearance between rule and content
  nscoord phi = 0, psi = 0;
  if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
    phi = fm->XHeight();
  else
    phi = ruleThickness;
  psi = ruleThickness + phi/4;

  // built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
  if (bmOne.ascent > bmBase.ascent)
    psi += bmOne.ascent - bmBase.ascent;

  // make sure that the rule appears on on screen
  nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
  if (ruleThickness < onePixel) {
    ruleThickness = onePixel;
  }

  // adjust clearance psi to get an exact number of pixels -- this
  // gives a nicer & uniform look on stacked radicals (bug 130282)
  nscoord delta = psi % onePixel;
  if (delta)
    psi += onePixel - delta; // round up

  // Stretch the radical symbol to the appropriate height if it is not big enough.
  nsBoundingMetrics contSize = bmBase;
  contSize.descent = bmBase.ascent + bmBase.descent + psi;
  contSize.ascent = ruleThickness;

  // height(radical) should be >= height(base) + psi + ruleThickness
  nsBoundingMetrics radicalSize;
  mSqrChar.Stretch(aPresContext, renderingContext,
                   NS_STRETCH_DIRECTION_VERTICAL, 
                   contSize, radicalSize,
                   NS_STRETCH_LARGER);
  // radicalSize have changed at this point, and should match with
  // the bounding metrics of the char
  mSqrChar.GetBoundingMetrics(bmSqr);

  // Update the desired size for the container (like msqrt, index is not yet included)
  // the baseline will be that of the base.
  mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
  mBoundingMetrics.descent = 
    NS_MAX(bmBase.descent,
           (bmSqr.ascent + bmSqr.descent - mBoundingMetrics.ascent));
  mBoundingMetrics.width = bmSqr.width + bmBase.width;
  mBoundingMetrics.leftBearing = bmSqr.leftBearing;
  mBoundingMetrics.rightBearing = bmSqr.width + 
    NS_MAX(bmBase.width, bmBase.rightBearing); // take also care of the rule

  aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
  aDesiredSize.height = aDesiredSize.ascent +
    NS_MAX(baseSize.height - baseSize.ascent,
           mBoundingMetrics.descent + ruleThickness);
  aDesiredSize.width = mBoundingMetrics.width;

  /////////////
  // Re-adjust the desired size to include the index.
  
  // the index is raised by some fraction of the height
  // of the radical, see \mroot macro in App. B, TexBook
  nscoord raiseIndexDelta = NSToCoordRound(0.6f * (bmSqr.ascent + bmSqr.descent));
  nscoord indexRaisedAscent = mBoundingMetrics.ascent // top of radical 
    - (bmSqr.ascent + bmSqr.descent) // to bottom of radical
    + raiseIndexDelta + bmIndex.ascent + bmIndex.descent; // to top of raised index

  nscoord indexClearance = 0;
  if (mBoundingMetrics.ascent < indexRaisedAscent) {
    indexClearance = 
      indexRaisedAscent - mBoundingMetrics.ascent; // excess gap introduced by a tall index 
    mBoundingMetrics.ascent = indexRaisedAscent;
    nscoord descent = aDesiredSize.height - aDesiredSize.ascent;
    aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
    aDesiredSize.height = aDesiredSize.ascent + descent;
  }

  nscoord dxIndex, dxSqr;
  GetRadicalXOffsets(bmIndex.width, bmSqr.width, fm, &dxIndex, &dxSqr);

  // place the index
  nscoord dx = dxIndex;
  nscoord dy = aDesiredSize.ascent - (indexRaisedAscent + indexSize.ascent - bmIndex.ascent);
  FinishReflowChild(indexFrame, aPresContext, nsnull, indexSize, dx, dy, 0);

  // place the radical symbol and the radical bar
  dx = dxSqr;
  dy = indexClearance + leading; // leave a leading at the top
  mSqrChar.SetRect(nsRect(dx, dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
  dx += bmSqr.width;
  mBarRect.SetRect(dx, dy, bmBase.width, ruleThickness);

  // place the base
  dy = aDesiredSize.ascent - baseSize.ascent;
  FinishReflowChild(baseFrame, aPresContext, nsnull, baseSize, dx, dy, 0);

  mReference.x = 0;
  mReference.y = aDesiredSize.ascent;

  mBoundingMetrics.width = dx + bmBase.width;
  mBoundingMetrics.leftBearing = 
    NS_MIN(dxIndex + bmIndex.leftBearing, dxSqr + bmSqr.leftBearing);
  mBoundingMetrics.rightBearing = dx +
    NS_MAX(bmBase.width, bmBase.rightBearing);

  aDesiredSize.width = mBoundingMetrics.width;
  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
  GatherAndStoreOverflow(&aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return NS_OK;
}