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

void
nsTextControlFrame::ReflowTextControlChild(nsIFrame*                aKid,
                                           nsPresContext*           aPresContext,
                                           const nsHTMLReflowState& aReflowState,
                                           nsReflowStatus&          aStatus,
                                           nsHTMLReflowMetrics& aParentDesiredSize)
{
  // compute available size and frame offsets for child
  WritingMode wm = aKid->GetWritingMode();
  LogicalSize availSize = aReflowState.ComputedSizeWithPadding(wm);
  availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;

  nsHTMLReflowState kidReflowState(aPresContext, aReflowState, 
                                   aKid, availSize, nullptr,
                                   nsHTMLReflowState::CALLER_WILL_INIT);
  // Override padding with our computed padding in case we got it from theming or percentage
  kidReflowState.Init(aPresContext, nullptr, nullptr, &aReflowState.ComputedPhysicalPadding());

  // Set computed width and computed height for the child
  kidReflowState.SetComputedWidth(aReflowState.ComputedWidth());
  kidReflowState.SetComputedHeight(aReflowState.ComputedHeight());

  // Offset the frame by the size of the parent's border
  nscoord xOffset = aReflowState.ComputedPhysicalBorderPadding().left -
                    aReflowState.ComputedPhysicalPadding().left;
  nscoord yOffset = aReflowState.ComputedPhysicalBorderPadding().top -
                    aReflowState.ComputedPhysicalPadding().top;

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

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

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

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

  if (aReflowState.mFlags.mSpecialHeightReflow) {
    FirstInFlow()->AddStateBits(NS_TABLE_CELL_HAD_SPECIAL_REFLOW);
  }

  // see if a special height reflow needs to occur due to having a pct height
  nsTableFrame::CheckRequestSpecialHeightReflow(aReflowState);

  aStatus = NS_FRAME_COMPLETE;
  nsSize availSize(aReflowState.AvailableWidth(), aReflowState.AvailableHeight());

  nsMargin borderPadding = aReflowState.ComputedPhysicalPadding();
  nsMargin border;
  GetBorderWidth(border);
  borderPadding += border;

  nscoord topInset    = borderPadding.top;
  nscoord rightInset  = borderPadding.right;
  nscoord bottomInset = borderPadding.bottom;
  nscoord leftInset   = borderPadding.left;

  // reduce available space by insets, if we're in a constrained situation
  availSize.width -= leftInset + rightInset;
  if (NS_UNCONSTRAINEDSIZE != availSize.height)
    availSize.height -= topInset + bottomInset;

  // Try to reflow the child into the available space. It might not
  // fit or might need continuing.
  if (availSize.height < 0)
    availSize.height = 1;

  nsHTMLReflowMetrics kidSize(aReflowState.GetWritingMode(), aDesiredSize.mFlags);
  kidSize.Width() = kidSize.Height() = 0;
  SetPriorAvailWidth(aReflowState.AvailableWidth());
  nsIFrame* firstKid = mFrames.FirstChild();
  NS_ASSERTION(firstKid, "Frame construction error, a table cell always has an inner cell frame");
  nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);

  if (aReflowState.mFlags.mSpecialHeightReflow) {
    const_cast<nsHTMLReflowState&>(aReflowState).SetComputedHeight(mRect.height - topInset - bottomInset);
    DISPLAY_REFLOW_CHANGE();
  }
  else if (aPresContext->IsPaginated()) {
    nscoord computedUnpaginatedHeight =
      CalcUnpaginagedHeight(aPresContext, (nsTableCellFrame&)*this,
                            *tableFrame, topInset + bottomInset);
    if (computedUnpaginatedHeight > 0) {
      const_cast<nsHTMLReflowState&>(aReflowState).SetComputedHeight(computedUnpaginatedHeight);
      DISPLAY_REFLOW_CHANGE();
    }
  }
  else {
    SetHasPctOverHeight(false);
  }

  nsHTMLReflowState kidReflowState(aPresContext, aReflowState, firstKid,
                                   availSize);

  // Don't be a percent height observer if we're in the middle of
  // special-height reflow, in case we get an accidental NotifyPercentHeight()
  // call (which we shouldn't honor during special-height reflow)
  if (!aReflowState.mFlags.mSpecialHeightReflow) {
    // mPercentHeightObserver is for children of cells in quirks mode,
    // but only those than are tables in standards mode.  NeedsToObserve
    // will determine how far this is propagated to descendants.
    kidReflowState.mPercentHeightObserver = this;
  }
  // Don't propagate special height reflow state to our kids
  kidReflowState.mFlags.mSpecialHeightReflow = false;

  if (aReflowState.mFlags.mSpecialHeightReflow ||
      (FirstInFlow()->GetStateBits() & NS_TABLE_CELL_HAD_SPECIAL_REFLOW)) {
    // We need to force the kid to have mVResize set if we've had a
    // special reflow in the past, since the non-special reflow needs to
    // resize back to what it was without the special height reflow.
    kidReflowState.mFlags.mVResize = true;
  }

  nsPoint kidOrigin(leftInset, topInset);
  nsRect origRect = firstKid->GetRect();
  nsRect origVisualOverflow = firstKid->GetVisualOverflowRect();
  bool firstReflow = (firstKid->GetStateBits() & NS_FRAME_FIRST_REFLOW) != 0;

  ReflowChild(firstKid, aPresContext, kidSize, kidReflowState,
              kidOrigin.x, kidOrigin.y, 0, aStatus);
  if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
    // Don't pass OVERFLOW_INCOMPLETE through tables until they can actually handle it
    //XXX should paginate overflow as overflow, but not in this patch (bug 379349)
    NS_FRAME_SET_INCOMPLETE(aStatus);
    printf("Set table cell incomplete %p\n", static_cast<void*>(this));
  }

  // XXXbz is this invalidate actually needed, really?
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      mLegendRect.BStart(wm) =
        (border.BStart(wm) - mLegendRect.BSize(wm)) / 2;
    }

    // if the legend space changes then we need to reflow the
    // content area as well.
    if (mLegendSpace != oldSpace && inner) {
      reflowInner = true;
    }

    FinishReflowChild(legend, aPresContext, legendDesiredSize,
                      legendReflowState.ptr(), wm, LogicalPoint(wm),
                      dummyContainerSize, NS_FRAME_NO_MOVE_FRAME);
  } else if (!legend) {
    mLegendRect.SetEmpty();
    mLegendSpace = 0;
  } else {
    // mLegendSpace and mLegendRect haven't changed, but we need
    // the used margin when placing the legend.
    legendMargin = legend->GetLogicalUsedMargin(wm);
  }

  // This containerSize is incomplete as yet: it does not include the size
  // of the |inner| frame itself.
  nsSize containerSize = (LogicalSize(wm, 0, mLegendSpace) +
                          border.Size(wm)).GetPhysicalSize(wm);
  // reflow the content frame only if needed
  if (reflowInner) {
    nsHTMLReflowState kidReflowState(aPresContext, aReflowState, inner,
                                     innerAvailSize, nullptr,
                                     nsHTMLReflowState::CALLER_WILL_INIT);
    // Override computed padding, in case it's percentage padding
    kidReflowState.Init(aPresContext, nullptr, nullptr,
                        &aReflowState.ComputedPhysicalPadding());
    // Our child is "height:100%" but we actually want its height to be reduced
    // by the amount of content-height the legend is eating up, unless our
    // height is unconstrained (in which case the child's will be too).
    if (aReflowState.ComputedBSize() != NS_UNCONSTRAINEDSIZE) {
      kidReflowState.SetComputedBSize(
         std::max(0, aReflowState.ComputedBSize() - mLegendSpace));
    }

    if (aReflowState.ComputedMinBSize() > 0) {
      kidReflowState.ComputedMinBSize() =
        std::max(0, aReflowState.ComputedMinBSize() - mLegendSpace);
    }

    if (aReflowState.ComputedMaxBSize() != NS_UNCONSTRAINEDSIZE) {
      kidReflowState.ComputedMaxBSize() =
        std::max(0, aReflowState.ComputedMaxBSize() - mLegendSpace);
    }

    nsHTMLReflowMetrics kidDesiredSize(kidReflowState,
                                       aDesiredSize.mFlags);
    // Reflow the frame
    NS_ASSERTION(kidReflowState.ComputedPhysicalMargin() == nsMargin(0,0,0,0),
                 "Margins on anonymous fieldset child not supported!");
    LogicalPoint pt(wm, border.IStart(wm), border.BStart(wm) + mLegendSpace);

    // We don't know the correct containerSize until we have reflowed |inner|,
    // so we use a dummy value for now; FinishReflowChild will fix the position
    // if necessary.
    const nsSize dummyContainerSize;
    ReflowChild(inner, aPresContext, kidDesiredSize, kidReflowState,
                wm, pt, dummyContainerSize, 0, aStatus);

void
nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame*                aDelegatingFrame,
                                               nsPresContext*           aPresContext,
                                               const nsHTMLReflowState& aReflowState,
                                               const nsRect&            aContainingBlock,
                                               bool                     aConstrainHeight,
                                               nsIFrame*                aKidFrame,
                                               nsReflowStatus&          aStatus,
                                               nsOverflowAreas*         aOverflowAreas)
{
#ifdef DEBUG
  if (nsBlockFrame::gNoisyReflow) {
    nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent);
    printf("abs pos ");
    if (aKidFrame) {
      nsAutoString name;
      aKidFrame->GetFrameName(name);
      printf("%s ", NS_LossyConvertUTF16toASCII(name).get());
    }

    char width[16];
    char height[16];
    PrettyUC(aReflowState.AvailableWidth(), width);
    PrettyUC(aReflowState.AvailableHeight(), height);
    printf(" a=%s,%s ", width, height);
    PrettyUC(aReflowState.ComputedWidth(), width);
    PrettyUC(aReflowState.ComputedHeight(), height);
    printf("c=%s,%s \n", width, height);
  }
  AutoNoisyIndenter indent(nsBlockFrame::gNoisy);
#endif // DEBUG

  nscoord availWidth = aContainingBlock.width;
  if (availWidth == -1) {
    NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
                 "Must have a useful width _somewhere_");
    availWidth =
      aReflowState.ComputedWidth() + aReflowState.ComputedPhysicalPadding().LeftRight();
  }

  nsHTMLReflowMetrics kidDesiredSize(aReflowState);
  nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
                                   nsSize(availWidth, NS_UNCONSTRAINEDSIZE),
                                   aContainingBlock.width,
                                   aContainingBlock.height);

  // Send the WillReflow() notification and position the frame
  aKidFrame->WillReflow(aPresContext);

  // Get the border values
  const nsMargin& border = aReflowState.mStyleBorder->GetComputedBorder();

  bool constrainHeight = (aReflowState.AvailableHeight() != NS_UNCONSTRAINEDSIZE)
    && aConstrainHeight
       // Don't split if told not to (e.g. for fixed frames)
    && (aDelegatingFrame->GetType() != nsGkAtoms::inlineFrame)
       //XXX we don't handle splitting frames for inline absolute containing blocks yet
    && (aKidFrame->GetRect().y <= aReflowState.AvailableHeight());
       // Don't split things below the fold. (Ideally we shouldn't *have*
       // anything totally below the fold, but we can't position frames
       // across next-in-flow breaks yet.
  if (constrainHeight) {
    kidReflowState.AvailableHeight() = aReflowState.AvailableHeight() - border.top
                                     - kidReflowState.ComputedPhysicalMargin().top;
    if (NS_AUTOOFFSET != kidReflowState.ComputedPhysicalOffsets().top)
      kidReflowState.AvailableHeight() -= kidReflowState.ComputedPhysicalOffsets().top;
  }

  // Do the reflow
  aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);

  // If we're solving for 'left' or 'top', then compute it now that we know the
  // width/height
  if ((NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().left) ||
      (NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().top)) {
    nscoord aContainingBlockWidth = aContainingBlock.width;
    nscoord aContainingBlockHeight = aContainingBlock.height;

    if (-1 == aContainingBlockWidth) {
      // Get the containing block width/height
      kidReflowState.ComputeContainingBlockRectangle(aPresContext,
                                                     &aReflowState,
                                                     aContainingBlockWidth,
                                                     aContainingBlockHeight);
    }

    if (NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().left) {
      NS_ASSERTION(NS_AUTOOFFSET != kidReflowState.ComputedPhysicalOffsets().right,
                   "Can't solve for both left and right");
      kidReflowState.ComputedPhysicalOffsets().left = aContainingBlockWidth -
                                             kidReflowState.ComputedPhysicalOffsets().right -
                                             kidReflowState.ComputedPhysicalMargin().right -
                                             kidDesiredSize.Width() -
                                             kidReflowState.ComputedPhysicalMargin().left;
    }
    if (NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().top) {
      kidReflowState.ComputedPhysicalOffsets().top = aContainingBlockHeight -
                                            kidReflowState.ComputedPhysicalOffsets().bottom -
                                            kidReflowState.ComputedPhysicalMargin().bottom -
                                            kidDesiredSize.Height() -
//.........这里部分代码省略.........

void
nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
                                               nsHTMLReflowMetrics& aButtonDesiredSize,
                                               const nsHTMLReflowState& aButtonReflowState,
                                               nsIFrame* aFirstKid)
{
  // Buttons have some bonus renderer-determined border/padding,
  // which occupies part of the button's content-box area:
  const nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding();

  WritingMode wm = aFirstKid->GetWritingMode();
  LogicalSize availSize = aButtonReflowState.ComputedSize(GetWritingMode());
  availSize.BSize(wm) = NS_INTRINSICSIZE;

  // Indent the child inside us by the focus border. We must do this separate
  // from the regular border.
  availSize.ISize(wm) -= LogicalMargin(wm, focusPadding).IStartEnd(wm);

  // See whether out availSize's width is big enough.  If it's smaller than our
  // intrinsic min width, that means that the kid wouldn't really fit; for a
  // better look in such cases we adjust the available width and our left
  // offset to allow the kid to spill left into our padding.
  nscoord xoffset = focusPadding.left +
    aButtonReflowState.ComputedPhysicalBorderPadding().left;
  nscoord extrawidth = GetMinISize(aButtonReflowState.rendContext) -
    aButtonReflowState.ComputedWidth();
  if (extrawidth > 0) {
    nscoord extraleft = extrawidth / 2;
    nscoord extraright = extrawidth - extraleft;
    NS_ASSERTION(extraright >=0, "How'd that happen?");

    // Do not allow the extras to be bigger than the relevant padding
    extraleft = std::min(extraleft, aButtonReflowState.ComputedPhysicalPadding().left);
    extraright = std::min(extraright, aButtonReflowState.ComputedPhysicalPadding().right);
    xoffset -= extraleft;
    availSize.Width(wm) = availSize.Width(wm) + extraleft + extraright;
  }
  availSize.Width(wm) = std::max(availSize.Width(wm), 0);

  // Give child a clone of the button's reflow state, with height/width reduced
  // by focusPadding, so that descendants with height:100% don't protrude.
  nsHTMLReflowState adjustedButtonReflowState =
    CloneReflowStateWithReducedContentBox(aButtonReflowState, focusPadding);

  nsHTMLReflowState contentsReflowState(aPresContext,
                                        adjustedButtonReflowState,
                                        aFirstKid, availSize);

  nsReflowStatus contentsReflowStatus;
  nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
  ReflowChild(aFirstKid, aPresContext,
              contentsDesiredSize, contentsReflowState,
              xoffset,
              focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top,
              0, contentsReflowStatus);
  MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus),
             "We gave button-contents frame unconstrained available height, "
             "so it should be complete");

  // Compute the button's content-box height:
  nscoord buttonContentBoxHeight = 0;
  if (aButtonReflowState.ComputedHeight() != NS_INTRINSICSIZE) {
    // Button has a fixed height -- that's its content-box height.
    buttonContentBoxHeight = aButtonReflowState.ComputedHeight();
  } else {
    // Button is intrinsically sized -- it should shrinkwrap the
    // button-contents' height, plus any focus-padding space:
    buttonContentBoxHeight =
      contentsDesiredSize.Height() + focusPadding.TopBottom();

    // Make sure we obey min/max-height in the case when we're doing intrinsic
    // sizing (we get it for free when we have a non-intrinsic
    // aButtonReflowState.ComputedHeight()).  Note that we do this before
    // adjusting for borderpadding, since mComputedMaxHeight and
    // mComputedMinHeight are content heights.
    buttonContentBoxHeight =
      NS_CSS_MINMAX(buttonContentBoxHeight,
                    aButtonReflowState.ComputedMinHeight(),
                    aButtonReflowState.ComputedMaxHeight());
  }

  // Center child vertically in the button
  // (technically, inside of the button's focus-padding area)
  nscoord extraSpace =
    buttonContentBoxHeight - focusPadding.TopBottom() -
    contentsDesiredSize.Height();

  nscoord yoffset = std::max(0, extraSpace / 2);

  // Adjust yoffset to be in terms of the button's frame-rect, instead of
  // its focus-padding rect:
  yoffset += focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top;

  // Place the child
  FinishReflowChild(aFirstKid, aPresContext,
                    contentsDesiredSize, &contentsReflowState,
                    xoffset, yoffset, 0);

  // Make sure we have a useful 'ascent' value for the child
  if (contentsDesiredSize.BlockStartAscent() ==
//.........这里部分代码省略.........