C++ nsHTMLReflowState::ComputedWidth方法代码示例

nsresult
nsNumberControlFrame::
  ReflowAnonymousContent(nsPresContext* aPresContext,
                         nsHTMLReflowMetrics& aWrappersDesiredSize,
                         const nsHTMLReflowState& aParentReflowState,
                         nsIFrame* aOuterWrapperFrame)
{
  MOZ_ASSERT(aOuterWrapperFrame);

  // The width of our content box, which is the available width
  // for our anonymous content:
  nscoord inputFrameContentBoxWidth = aParentReflowState.ComputedWidth();

  nsHTMLReflowState wrapperReflowState(aPresContext, aParentReflowState,
                                       aOuterWrapperFrame,
                                       nsSize(inputFrameContentBoxWidth,
                                              NS_UNCONSTRAINEDSIZE));

  nscoord xoffset = aParentReflowState.mComputedBorderPadding.left +
                      wrapperReflowState.mComputedMargin.left;
  nscoord yoffset = aParentReflowState.mComputedBorderPadding.top +
                      wrapperReflowState.mComputedMargin.top;

  nsReflowStatus childStatus;
  nsresult rv = ReflowChild(aOuterWrapperFrame, aPresContext,
                            aWrappersDesiredSize, wrapperReflowState,
                            xoffset, yoffset, 0, childStatus);
  NS_ENSURE_SUCCESS(rv, rv);
  MOZ_ASSERT(NS_FRAME_IS_FULLY_COMPLETE(childStatus),
             "We gave our child unconstrained height, so it should be complete");
  return FinishReflowChild(aOuterWrapperFrame, aPresContext,
                           &wrapperReflowState, aWrappersDesiredSize,
                           xoffset, yoffset, 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
nsGridContainerFrame::Reflow(nsPresContext*           aPresContext,
                             nsHTMLReflowMetrics&     aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsGridContainerFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  if (IsFrameTreeTooDeep(aReflowState, aDesiredSize, aStatus)) {
    return;
  }

  nsMargin bp = aReflowState.ComputedPhysicalBorderPadding();
  ApplySkipSides(bp);
  nscoord contentHeight = GetEffectiveComputedHeight(aReflowState);
  if (contentHeight == NS_AUTOHEIGHT) {
    contentHeight = 0;
  }
  aDesiredSize.Width() = aReflowState.ComputedWidth() + bp.LeftRight();
  aDesiredSize.Height() = contentHeight + bp.TopBottom();
  aDesiredSize.SetOverflowAreasToDesiredBounds();
  aStatus = NS_FRAME_COMPLETE;
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}

/* virtual */ void
BasicTableLayoutStrategy::ComputeColumnWidths(const nsHTMLReflowState& aReflowState)
{
    nscoord width = aReflowState.ComputedWidth();

    if (mLastCalcWidth == width)
        return;
    mLastCalcWidth = width;

    NS_ASSERTION((mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN) ==
                 (mPrefWidth == NS_INTRINSIC_WIDTH_UNKNOWN),
                 "dirtyness out of sync");
    NS_ASSERTION((mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN) ==
                 (mPrefWidthPctExpand == NS_INTRINSIC_WIDTH_UNKNOWN),
                 "dirtyness out of sync");
    // XXX Is this needed?
    if (mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN)
        ComputeIntrinsicWidths(aReflowState.rendContext);

    nsTableCellMap *cellMap = mTableFrame->GetCellMap();
    int32_t colCount = cellMap->GetColCount();
    if (colCount <= 0)
        return; // nothing to do

    DistributeWidthToColumns(width, 0, colCount, BTLS_FINAL_WIDTH, false);

#ifdef DEBUG_TABLE_STRATEGY
    printf("ComputeColumnWidths final\n");
    mTableFrame->Dump(false, true, false);
#endif
}

void
nsSVGForeignObjectFrame::Reflow(nsPresContext*           aPresContext,
                                nsHTMLReflowMetrics&     aDesiredSize,
                                const nsHTMLReflowState& aReflowState,
                                nsReflowStatus&          aStatus)
{
  MOZ_ASSERT(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
             "Should not have been called");

  // Only InvalidateAndScheduleBoundsUpdate marks us with NS_FRAME_IS_DIRTY,
  // so if that bit is still set we still have a resize pending. If we hit
  // this assertion, then we should get the presShell to skip reflow roots
  // that have a dirty parent since a reflow is going to come via the
  // reflow root's parent anyway.
  NS_ASSERTION(!(GetStateBits() & NS_FRAME_IS_DIRTY),
               "Reflowing while a resize is pending is wasteful");

  // ReflowSVG makes sure mRect is up to date before we're called.

  NS_ASSERTION(!aReflowState.parentReflowState,
               "should only get reflow from being reflow root");
  NS_ASSERTION(aReflowState.ComputedWidth() == GetSize().width &&
               aReflowState.ComputedHeight() == GetSize().height,
               "reflow roots should be reflowed at existing size and "
               "svg.css should ensure we have no padding/border/margin");

  DoReflow();

  WritingMode wm = aReflowState.GetWritingMode();
  LogicalSize finalSize(wm, aReflowState.ComputedISize(),
                        aReflowState.ComputedBSize());
  aDesiredSize.SetSize(wm, finalSize);
  aDesiredSize.SetOverflowAreasToDesiredBounds();
  aStatus = NS_FRAME_COMPLETE;
}

// 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;
}

NS_IMETHODIMP 
nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
                               nsHTMLReflowMetrics& aDesiredSize,
                               const nsHTMLReflowState& aReflowState,
                               nsReflowStatus& aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE,
                  "Should have real computed width by now");

  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), true);
  }

  // Reflow the child
  nsIFrame* firstKid = mFrames.FirstChild();

  // XXXbz Eventually we may want to check-and-bail if
  // !aReflowState.ShouldReflowAllKids() &&
  // !NS_SUBTREE_DIRTY(firstKid).
  // We'd need to cache our ascent for that, of course.
  
  nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding();
  
  // Reflow the contents of the button.
  ReflowButtonContents(aPresContext, aDesiredSize, aReflowState, firstKid,
                       focusPadding, aStatus);

  aDesiredSize.width = aReflowState.ComputedWidth();

  aDesiredSize.width += aReflowState.mComputedBorderPadding.LeftRight();
  aDesiredSize.height += aReflowState.mComputedBorderPadding.TopBottom();

  aDesiredSize.ascent +=
    aReflowState.mComputedBorderPadding.top + focusPadding.top;

  aDesiredSize.SetOverflowAreasToDesiredBounds();
  ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid);
  FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, aStatus);

  aStatus = NS_FRAME_COMPLETE;

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

NS_IMETHODIMP
nsNumberControlFrame::Reflow(nsPresContext* aPresContext,
                             nsHTMLReflowMetrics& aDesiredSize,
                             const nsHTMLReflowState& aReflowState,
                             nsReflowStatus& aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsNumberControlFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  NS_ASSERTION(mOuterWrapper, "Outer wrapper div must exist!");

  NS_ASSERTION(!GetPrevContinuation() && !GetNextContinuation(),
               "nsNumberControlFrame should not have continuations; if it does we "
               "need to call RegUnregAccessKey only for the first");

  NS_ASSERTION(!mFrames.FirstChild() ||
               !mFrames.FirstChild()->GetNextSibling(),
               "We expect at most one direct child frame");

  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(this, true);
  }

  nsHTMLReflowMetrics wrappersDesiredSize;
  nsIFrame* outerWrapperFrame = mOuterWrapper->GetPrimaryFrame();
  if (outerWrapperFrame) { // display:none?
    NS_ASSERTION(outerWrapperFrame == mFrames.FirstChild(), "huh?");
    nsresult rv =
      ReflowAnonymousContent(aPresContext, wrappersDesiredSize,
                             aReflowState, outerWrapperFrame);
    NS_ENSURE_SUCCESS(rv, rv);
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, outerWrapperFrame);
  }

  nscoord computedHeight = aReflowState.ComputedHeight();
  if (computedHeight == NS_AUTOHEIGHT) {
    computedHeight =
      outerWrapperFrame ? outerWrapperFrame->GetSize().height : 0;
  }
  aDesiredSize.width = aReflowState.ComputedWidth() +
                         aReflowState.mComputedBorderPadding.LeftRight();
  aDesiredSize.height = computedHeight +
                          aReflowState.mComputedBorderPadding.TopBottom();

  if (outerWrapperFrame) {
    aDesiredSize.ascent = wrappersDesiredSize.ascent +
                            outerWrapperFrame->GetPosition().y;
  }

  aDesiredSize.SetOverflowAreasToDesiredBounds();

  FinishAndStoreOverflow(&aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);

  return NS_OK;
}

NS_IMETHODIMP
nsRangeFrame::Reflow(nsPresContext*           aPresContext,
                     nsHTMLReflowMetrics&     aDesiredSize,
                     const nsHTMLReflowState& aReflowState,
                     nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsRangeFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  NS_ASSERTION(mTrackDiv, "::-moz-range-track div must exist!");
  NS_ASSERTION(mProgressDiv, "::-moz-range-progress div must exist!");
  NS_ASSERTION(mThumbDiv, "::-moz-range-thumb div must exist!");
  NS_ASSERTION(!GetPrevContinuation() && !GetNextContinuation(),
               "nsRangeFrame should not have continuations; if it does we "
               "need to call RegUnregAccessKey only for the first.");

  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(this, true);
  }

  nscoord computedHeight = aReflowState.ComputedHeight();
  if (computedHeight == NS_AUTOHEIGHT) {
    computedHeight = 0;
  }
  aDesiredSize.width = aReflowState.ComputedWidth() +
                       aReflowState.mComputedBorderPadding.LeftRight();
  aDesiredSize.height = computedHeight +
                        aReflowState.mComputedBorderPadding.TopBottom();

  nsresult rv =
    ReflowAnonymousContent(aPresContext, aDesiredSize, aReflowState);
  NS_ENSURE_SUCCESS(rv, rv);

  aDesiredSize.SetOverflowAreasToDesiredBounds();

  nsIFrame* trackFrame = mTrackDiv->GetPrimaryFrame();
  if (trackFrame) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, trackFrame);
  }

  nsIFrame* rangeProgressFrame = mProgressDiv->GetPrimaryFrame();
  if (rangeProgressFrame) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, rangeProgressFrame);
  }

  nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame();
  if (thumbFrame) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, thumbFrame);
  }

  FinishAndStoreOverflow(&aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);

  return NS_OK;
}

nsresult
nsComboboxControlFrame::ReflowDropdown(nsPresContext*  aPresContext, 
                                       const nsHTMLReflowState& aReflowState)
{
  // All we want out of it later on, really, is the height of a row, so we
  // don't even need to cache mDropdownFrame's ascent or anything.  If we don't
  // need to reflow it, just bail out here.
  if (!aReflowState.ShouldReflowAllKids() &&
      !NS_SUBTREE_DIRTY(mDropdownFrame)) {
    return NS_OK;
  }

  // XXXbz this will, for small-height dropdowns, have extra space on the right
  // edge for the scrollbar we don't show... but that's the best we can do here
  // for now.
  nsSize availSize(aReflowState.availableWidth, NS_UNCONSTRAINEDSIZE);
  nsHTMLReflowState kidReflowState(aPresContext, aReflowState, mDropdownFrame,
                                   availSize);

  // If the dropdown's intrinsic width is narrower than our specified width,
  // then expand it out.  We want our border-box width to end up the same as
  // the dropdown's so account for both sets of mComputedBorderPadding.
  nscoord forcedWidth = aReflowState.ComputedWidth() +
    aReflowState.mComputedBorderPadding.LeftRight() -
    kidReflowState.mComputedBorderPadding.LeftRight();
  kidReflowState.SetComputedWidth(PR_MAX(kidReflowState.ComputedWidth(),
                                         forcedWidth));

  // ensure we start off hidden
  if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
    nsIView* view = mDropdownFrame->GetView();
    nsIViewManager* viewManager = view->GetViewManager();
    viewManager->SetViewVisibility(view, nsViewVisibility_kHide);
    nsRect emptyRect(0, 0, 0, 0);
    viewManager->ResizeView(view, emptyRect);
  }
  
  // Allow the child to move/size/change-visibility its view if it's currently
  // dropped down
  PRInt32 flags = NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_VISIBILITY | NS_FRAME_NO_SIZE_VIEW;
  if (mDroppedDown) {
    flags = 0;
  }
  nsRect rect = mDropdownFrame->GetRect();
  nsHTMLReflowMetrics desiredSize;
  nsReflowStatus ignoredStatus;
  nsresult rv = ReflowChild(mDropdownFrame, aPresContext, desiredSize,
                            kidReflowState, rect.x, rect.y, flags,
                            ignoredStatus);
 
   // Set the child's width and height to it's desired size
  FinishReflowChild(mDropdownFrame, aPresContext, &kidReflowState,
                    desiredSize, rect.x, rect.y, flags);
  return rv;
}

NS_IMETHODIMP
nsTextControlFrame::Reflow(nsPresContext*   aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsTextControlFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  // make sure that the form registers itself on the initial/first reflow
  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(this, true);
  }

  // set values of reflow's out parameters
  aDesiredSize.width = aReflowState.ComputedWidth() +
                        aReflowState.mComputedBorderPadding.LeftRight();
  aDesiredSize.height = NS_CSS_MINMAX(aReflowState.ComputedHeight(),
                                      aReflowState.mComputedMinHeight,
                                      aReflowState.mComputedMaxHeight);
  nscoord lineHeight = aDesiredSize.height;
  aDesiredSize.height += aReflowState.mComputedBorderPadding.TopBottom();

  // computation of the ascent wrt the input height
  float inflation = nsLayoutUtils::FontSizeInflationFor(this);
  if (!IsSingleLineTextControl()) {
    lineHeight = nsHTMLReflowState::CalcLineHeight(GetStyleContext(), 
                                                  NS_AUTOHEIGHT, inflation);
  }
  nsRefPtr<nsFontMetrics> fontMet;
  nsresult rv = nsLayoutUtils::GetFontMetricsForFrame(this, 
                                                      getter_AddRefs(fontMet), 
                                                      inflation);
  NS_ENSURE_SUCCESS(rv, rv);
  // now adjust for our borders and padding
  aDesiredSize.ascent = 
        nsLayoutUtils::GetCenteredFontBaseline(fontMet, lineHeight) 
        + aReflowState.mComputedBorderPadding.top;

  // overflow handling
  aDesiredSize.SetOverflowAreasToDesiredBounds();
  // perform reflow on all kids
  nsIFrame* kid = mFrames.FirstChild();
  while (kid) {
    ReflowTextControlChild(kid, aPresContext, aReflowState, aStatus, aDesiredSize);
    kid = kid->GetNextSibling();
  }
  // take into account css properties that affect overflow handling
  FinishAndStoreOverflow(&aDesiredSize);

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

static nscoord
ComputeDescendantWidth(const nsHTMLReflowState& aAncestorReflowState,
                       nsIFrame *aDescendantFrame)
{
  nsIFrame *ancestorFrame = aAncestorReflowState.frame->FirstInFlow();
  if (aDescendantFrame == ancestorFrame) {
    return aAncestorReflowState.ComputedWidth();
  }

  AutoInfallibleTArray<nsIFrame*, 16> frames;
  for (nsIFrame *f = aDescendantFrame; f != ancestorFrame;
       f = f->GetParent()->FirstInFlow()) {
    frames.AppendElement(f);
  }

  // This ignores the width contributions made by scrollbars, though in
  // reality we don't have any scrollbars on the sorts of devices on
  // which we use font inflation, so it's not a problem.  But it may
  // occasionally cause problems when writing tests on desktop.

  uint32_t len = frames.Length();
  nsHTMLReflowState *reflowStates = static_cast<nsHTMLReflowState*>
                                (moz_xmalloc(sizeof(nsHTMLReflowState) * len));
  nsPresContext *presContext = aDescendantFrame->PresContext();
  for (uint32_t i = 0; i < len; ++i) {
    const nsHTMLReflowState &parentReflowState =
      (i == 0) ? aAncestorReflowState : reflowStates[i - 1];
    nsIFrame *frame = frames[len - i - 1];
    WritingMode wm = frame->GetWritingMode();
    LogicalSize availSize = parentReflowState.ComputedSize(wm);
    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
    MOZ_ASSERT(frame->GetParent()->FirstInFlow() ==
                 parentReflowState.frame->FirstInFlow(),
               "bad logic in this function");
    new (reflowStates + i) nsHTMLReflowState(presContext, parentReflowState,
                                             frame, availSize);
  }

  MOZ_ASSERT(reflowStates[len - 1].frame == aDescendantFrame,
             "bad logic in this function");
  nscoord result = reflowStates[len - 1].ComputedWidth();

  for (uint32_t i = len; i-- != 0; ) {
    reflowStates[i].~nsHTMLReflowState();
  }
  moz_free(reflowStates);

  return result;
}

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

  NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE,
                  "Should have real computed width by now");

  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), true);
  }

  // Reflow the child
  nsIFrame* firstKid = mFrames.FirstChild();

  MOZ_ASSERT(firstKid, "Button should have a child frame for its contents");
  MOZ_ASSERT(!firstKid->GetNextSibling(),
             "Button should have exactly one child frame");
  MOZ_ASSERT(firstKid->StyleContext()->GetPseudo() ==
             nsCSSAnonBoxes::buttonContent,
             "Button's child frame has unexpected pseudo type!");

  // XXXbz Eventually we may want to check-and-bail if
  // !aReflowState.ShouldReflowAllKids() &&
  // !NS_SUBTREE_DIRTY(firstKid).
  // We'd need to cache our ascent for that, of course.

  // Reflow the contents of the button.
  // (This populates our aDesiredSize, too.)
  ReflowButtonContents(aPresContext, aDesiredSize,
                       aReflowState, firstKid);

  ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid);

  aStatus = NS_FRAME_COMPLETE;
  FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize,
                                 aReflowState, aStatus);

  // We're always complete and we don't support overflow containers
  // so we shouldn't have a next-in-flow ever.
  aStatus = NS_FRAME_COMPLETE;
  MOZ_ASSERT(!GetNextInFlow());

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}

void
nsTextControlFrame::ReflowTextControlChild(nsIFrame*                aKid,
                                           nsPresContext*           aPresContext,
                                           const nsHTMLReflowState& aReflowState,
                                           nsReflowStatus&          aStatus,
                                           nsHTMLReflowMetrics& aParentDesiredSize)
{
  // compute available size and frame offsets for child
  nsSize availSize(aReflowState.ComputedWidth(), 
                   aReflowState.ComputedHeight());
  availSize.width = std::max(availSize.width, 0);
  availSize.height = std::max(availSize.height, 0);
  
  nsHTMLReflowState kidReflowState(aPresContext, aReflowState, 
                                   aKid, availSize);

  // Set computed width and computed height for the child
  nscoord width = availSize.width;
  width -= kidReflowState.ComputedPhysicalMargin().LeftRight() +
              kidReflowState.ComputedPhysicalBorderPadding().LeftRight();
  width = std::max(width, 0);
  kidReflowState.SetComputedWidth(width);

  nscoord height = availSize.height;
  height -= kidReflowState.ComputedPhysicalMargin().TopBottom() +
              kidReflowState.ComputedPhysicalBorderPadding().TopBottom();
  height = std::max(height, 0);       
  kidReflowState.SetComputedHeight(height); 

  // compute the offsets
  nscoord xOffset = aReflowState.ComputedPhysicalBorderPadding().left
                      + kidReflowState.ComputedPhysicalMargin().left;
  nscoord yOffset = aReflowState.ComputedPhysicalBorderPadding().top
                      + kidReflowState.ComputedPhysicalMargin().top;

  // reflow the child
  nsHTMLReflowMetrics desiredSize(aReflowState.GetWritingMode());
  ReflowChild(aKid, aPresContext, desiredSize, kidReflowState, 
              xOffset, yOffset, 0, aStatus);

  // place the child
  FinishReflowChild(aKid, aPresContext, &kidReflowState, 
                    desiredSize, xOffset, yOffset, 0);

  // consider the overflow
  aParentDesiredSize.mOverflowAreas.UnionWith(desiredSize.mOverflowAreas);
}

NS_IMETHODIMP nsProgressFrame::Reflow(nsPresContext*           aPresContext,
                                      nsHTMLReflowMetrics&     aDesiredSize,
                                      const nsHTMLReflowState& aReflowState,
                                      nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsProgressFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

  NS_ASSERTION(mBarDiv, "Progress bar div must exist!");
  NS_ASSERTION(!GetPrevContinuation(),
               "nsProgressFrame should not have continuations; if it does we "
               "need to call RegUnregAccessKey only for the first.");

  if (mState & NS_FRAME_FIRST_REFLOW) {
    nsFormControlFrame::RegUnRegAccessKey(this, true);
  }

  nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
  NS_ASSERTION(barFrame, "The progress frame should have a child with a frame!");

  ReflowBarFrame(barFrame, aPresContext, aReflowState, aStatus);

  aDesiredSize.width = aReflowState.ComputedWidth() +
                       aReflowState.mComputedBorderPadding.LeftRight();
  aDesiredSize.height = aReflowState.ComputedHeight() +
                        aReflowState.mComputedBorderPadding.TopBottom();
  aDesiredSize.height = NS_CSS_MINMAX(aDesiredSize.height,
                                      aReflowState.mComputedMinHeight,
                                      aReflowState.mComputedMaxHeight);

  aDesiredSize.SetOverflowAreasToDesiredBounds();
  ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);
  FinishAndStoreOverflow(&aDesiredSize);

  aStatus = NS_FRAME_COMPLETE;

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);

  return NS_OK;
}