C++ nsHTMLReflowMetrics::ClearSize方法代码示例

void
nsTableColGroupFrame::Reflow(nsPresContext*          aPresContext,
                             nsHTMLReflowMetrics&     aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsTableColGroupFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  NS_ASSERTION(nullptr!=mContent, "bad state -- null content for frame");
  
  const nsStyleVisibility* groupVis = StyleVisibility();
  bool collapseGroup = (NS_STYLE_VISIBILITY_COLLAPSE == groupVis->mVisible);
  if (collapseGroup) {
    GetTableFrame()->SetNeedToCollapse(true);
  }
  // for every content child that (is a column thingy and does not already have a frame)
  // create a frame and adjust it's style
  
  for (nsIFrame *kidFrame = mFrames.FirstChild(); kidFrame;
       kidFrame = kidFrame->GetNextSibling()) {
    // Give the child frame a chance to reflow, even though we know it'll have 0 size
    nsHTMLReflowMetrics kidSize(aReflowState);
    nsHTMLReflowState kidReflowState(aPresContext, aReflowState, kidFrame,
                                     LogicalSize(kidFrame->GetWritingMode()));

    nsReflowStatus status;
    ReflowChild(kidFrame, aPresContext, kidSize, kidReflowState, 0, 0, 0, status);
    FinishReflowChild(kidFrame, aPresContext, kidSize, nullptr, 0, 0, 0);
  }

  aDesiredSize.ClearSize();
  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}

void
nsPlaceholderFrame::Reflow(nsPresContext*           aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
#ifdef DEBUG
  // We should be getting reflowed before our out-of-flow.
  // If this is our first reflow, and our out-of-flow has already received its
  // first reflow (before us), complain.
  // XXXdholbert This "look for a previous continuation or IB-split sibling"
  // code could use nsLayoutUtils::GetPrevContinuationOrIBSplitSibling(), if
  // we ever add a function like that. (We currently have a "Next" version.)
  if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
      !(mOutOfFlowFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {

    // Unfortunately, this can currently happen when the placeholder is in a
    // later continuation or later IB-split sibling than its out-of-flow (as
    // is the case in some of our existing unit tests). So for now, in that
    // case, we'll warn instead of asserting.
    bool isInContinuationOrIBSplit = false;
    nsIFrame* ancestor = this;
    while ((ancestor = ancestor->GetParent())) {
      if (ancestor->GetPrevContinuation() ||
          ancestor->Properties().Get(IBSplitPrevSibling())) {
        isInContinuationOrIBSplit = true;
        break;
      }
    }

    if (isInContinuationOrIBSplit) {
      NS_WARNING("Out-of-flow frame got reflowed before its placeholder");
    } else {
      NS_ERROR("Out-of-flow frame got reflowed before its placeholder");
    }
  }
#endif

  DO_GLOBAL_REFLOW_COUNT("nsPlaceholderFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  aDesiredSize.ClearSize();

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

void
nsTableColFrame::Reflow(nsPresContext*          aPresContext,
                                  nsHTMLReflowMetrics&     aDesiredSize,
                                  const nsHTMLReflowState& aReflowState,
                                  nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsTableColFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  aDesiredSize.ClearSize();
  const nsStyleVisibility* colVis = StyleVisibility();
  bool collapseCol = (NS_STYLE_VISIBILITY_COLLAPSE == colVis->mVisible);
  if (collapseCol) {
    nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
    tableFrame->SetNeedToCollapse(true);
  }
  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}

void
nsMathMLTokenFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
  MarkInReflow();
  mPresentationData.flags &= ~NS_MATHML_ERROR;

  // initializations needed for empty markup like <mtag></mtag>
  aDesiredSize.ClearSize();
  aDesiredSize.SetBlockStartAscent(0);
  aDesiredSize.mBoundingMetrics = nsBoundingMetrics();

  nsIFrame* childFrame = GetFirstPrincipalChild();
  while (childFrame) {
    // ask our children to compute their bounding metrics
    nsHTMLReflowMetrics childDesiredSize(aReflowState.GetWritingMode(),
                                         aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    WritingMode wm = childFrame->GetWritingMode();
    LogicalSize availSize = aReflowState.ComputedSize(wm);
    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
    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->GetDrawTarget(), aDesiredSize);

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

void
nsMathMLmrootFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
  MarkInReflow();
  nsReflowStatus childStatus;

  mPresentationData.flags &= ~NS_MATHML_ERROR;
  aDesiredSize.ClearSize();
  aDesiredSize.SetBlockStartAscent(0);

  nsBoundingMetrics bmSqr, bmBase, bmIndex;
  DrawTarget* drawTarget = aReflowState.rendContext->GetDrawTarget();

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

  int32_t count = 0;
  nsIFrame* baseFrame = nullptr;
  nsIFrame* indexFrame = nullptr;
  nsHTMLReflowMetrics baseSize(aReflowState);
  nsHTMLReflowMetrics indexSize(aReflowState);
  nsIFrame* childFrame = mFrames.FirstChild();
  while (childFrame) {
    // ask our children to compute their bounding metrics 
    nsHTMLReflowMetrics childDesiredSize(aReflowState,
                                         aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    WritingMode wm = childFrame->GetWritingMode();
    LogicalSize availSize = aReflowState.ComputedSize(wm);
    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    ReflowChild(childFrame, aPresContext,
                     childDesiredSize, childReflowState, childStatus);
    //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
    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
    ReportChildCountError();
    ReflowError(drawTarget, 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;
  }

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

  float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
  RefPtr<nsFontMetrics> fm =
    nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);

  nscoord ruleThickness, leading, psi;
  GetRadicalParameters(fm, StyleFont()->mMathDisplay ==
                       NS_MATHML_DISPLAYSTYLE_BLOCK,
                       ruleThickness, leading, psi);

  // built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
  char16_t one = '1';
  nsBoundingMetrics bmOne =
    nsLayoutUtils::AppUnitBoundsOfString(&one, 1, *fm, drawTarget);
  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;

//.........这里部分代码省略.........

void
nsMathMLmfencedFrame::Reflow(nsPresContext*          aPresContext,
                             nsHTMLReflowMetrics&     aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus&          aStatus)
{
  MarkInReflow();
  mPresentationData.flags &= ~NS_MATHML_ERROR;
  aDesiredSize.ClearSize();
  aDesiredSize.SetBlockStartAscent(0);
  aDesiredSize.mBoundingMetrics = nsBoundingMetrics();

  int32_t i;
  const nsStyleFont* font = StyleFont();
  float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
  RefPtr<nsFontMetrics> fm;
  nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
                                        fontSizeInflation);
  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;
  nsIFrame* firstChild = GetFirstPrincipalChild();
  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(aReflowState,
                                         aDesiredSize.mFlags
                                         | NS_REFLOW_CALC_BOUNDING_METRICS);
    WritingMode wm = childFrame->GetWritingMode();
    LogicalSize availSize = aReflowState.ComputedSize(wm);
    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
    nsHTMLReflowState childReflowState(aPresContext, aReflowState,
                                       childFrame, availSize);
    ReflowChild(childFrame, aPresContext, childDesiredSize,
                childReflowState, childStatus);
    //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
    SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
                                    childDesiredSize.mBoundingMetrics);

    mozilla::WritingMode outerWM = aReflowState.GetWritingMode();
    nscoord childDescent = childDesiredSize.BSize(outerWM) -
                           childDesiredSize.BlockStartAscent();
    if (descent < childDescent)
      descent = childDescent;
    if (ascent < childDesiredSize.BlockStartAscent())
      ascent = childDesiredSize.BlockStartAscent();

    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(aReflowState);
      // 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.BlockStartAscent();
      if (descent < childDescent)
        descent = childDescent;
//.........这里部分代码省略.........

void
nsTableOuterFrame::Reflow(nsPresContext*           aPresContext,
                                    nsHTMLReflowMetrics&     aDesiredSize,
                                    const nsHTMLReflowState& aOuterRS,
                                    nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsTableOuterFrame");
  DISPLAY_REFLOW(aPresContext, this, aOuterRS, aDesiredSize, aStatus);

  uint8_t captionSide = GetCaptionSide();

  // Initialize out parameters
  aDesiredSize.ClearSize();
  aStatus = NS_FRAME_COMPLETE;

  if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
    // Set up our kids.  They're already present, on an overflow list, 
    // or there are none so we'll create them now
    MoveOverflowToChildList();
  }

  // Use longs to get more-aligned space.
  #define LONGS_IN_HTMLRS \
    ((sizeof(nsHTMLReflowState) + sizeof(long) - 1) / sizeof(long))
  long captionRSSpace[LONGS_IN_HTMLRS];
  nsHTMLReflowState *captionRS =
    static_cast<nsHTMLReflowState*>((void*)captionRSSpace);
  long innerRSSpace[LONGS_IN_HTMLRS];
  nsHTMLReflowState *innerRS =
    static_cast<nsHTMLReflowState*>((void*) innerRSSpace);

  nsRect origInnerRect = InnerTableFrame()->GetRect();
  nsRect origInnerVisualOverflow = InnerTableFrame()->GetVisualOverflowRect();
  bool innerFirstReflow =
    (InnerTableFrame()->GetStateBits() & NS_FRAME_FIRST_REFLOW) != 0;
  nsRect origCaptionRect;
  nsRect origCaptionVisualOverflow;
  bool captionFirstReflow;
  if (mCaptionFrames.NotEmpty()) {
    origCaptionRect = mCaptionFrames.FirstChild()->GetRect();
    origCaptionVisualOverflow =
      mCaptionFrames.FirstChild()->GetVisualOverflowRect();
    captionFirstReflow =
      (mCaptionFrames.FirstChild()->GetStateBits() & NS_FRAME_FIRST_REFLOW) != 0;
  }
  
  // ComputeAutoSize has to match this logic.
  WritingMode wm;
  if (captionSide == NO_SIDE) {
    // We don't have a caption.
    wm = InnerTableFrame()->GetWritingMode();
    OuterBeginReflowChild(aPresContext, InnerTableFrame(), aOuterRS,
                          innerRSSpace, aOuterRS.ComputedSize(wm).ISize(wm));
  } else if (captionSide == NS_STYLE_CAPTION_SIDE_LEFT ||
             captionSide == NS_STYLE_CAPTION_SIDE_RIGHT) {
    // nsTableCaptionFrame::ComputeAutoSize takes care of making side
    // captions small.  Compute the caption's size first, and tell the
    // table to fit in what's left.
    wm = mCaptionFrames.FirstChild()->GetWritingMode();
    OuterBeginReflowChild(aPresContext, mCaptionFrames.FirstChild(), aOuterRS,
                          captionRSSpace, aOuterRS.ComputedSize(wm).ISize(wm));
    nscoord innerAvailISize = aOuterRS.ComputedSize(wm).ISize(wm) -
      captionRS->ComputedSizeWithMarginBorderPadding(wm).ISize(wm);
    OuterBeginReflowChild(aPresContext, InnerTableFrame(), aOuterRS,
                          innerRSSpace, innerAvailISize);

  } else if (captionSide == NS_STYLE_CAPTION_SIDE_TOP ||
             captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM) {
    // Compute the table's size first, and then prevent the caption from
    // being wider unless it has to be.
    //
    // Note that CSS 2.1 (but not 2.0) says:
    //   The width of the anonymous box is the border-edge width of the
    //   table box inside it
    // We don't actually make our anonymous box that width (if we did,
    // it would break 'auto' margins), but this effectively does that.
    wm = InnerTableFrame()->GetWritingMode();
    OuterBeginReflowChild(aPresContext, InnerTableFrame(), aOuterRS,
                          innerRSSpace, aOuterRS.ComputedSize(wm).ISize(wm));
    // It's good that CSS 2.1 says not to include margins, since we
    // can't, since they already been converted so they exactly
    // fill the available width (ignoring the margin on one side if
    // neither are auto).  (We take advantage of that later when we call
    // GetCaptionOrigin, though.)
    nscoord innerBorderWidth =
      innerRS->ComputedSizeWithBorderPadding(wm).ISize(wm);
    OuterBeginReflowChild(aPresContext, mCaptionFrames.FirstChild(), aOuterRS,
                          captionRSSpace, innerBorderWidth);
  } else {
    NS_ASSERTION(captionSide == NS_STYLE_CAPTION_SIDE_TOP_OUTSIDE ||
                 captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM_OUTSIDE,
                 "unexpected caption-side");
    // Size the table and the caption independently.
    wm = mCaptionFrames.FirstChild()->GetWritingMode();
    OuterBeginReflowChild(aPresContext, mCaptionFrames.FirstChild(), aOuterRS,
                          captionRSSpace, aOuterRS.ComputedSize(wm).ISize(wm));
    wm = InnerTableFrame()->GetWritingMode();
    OuterBeginReflowChild(aPresContext, InnerTableFrame(), aOuterRS,
                          innerRSSpace, aOuterRS.ComputedSize(wm).ISize(wm));
  }
//.........这里部分代码省略.........