Example #1
0
bool
nsColumnSetFrame::ReflowChildren(nsHTMLReflowMetrics&     aDesiredSize,
                                 const nsHTMLReflowState& aReflowState,
                                 nsReflowStatus&          aStatus,
                                 const ReflowConfig&      aConfig,
                                 bool                     aUnboundedLastColumn,
                                 nsCollapsingMargin*      aBottomMarginCarriedOut,
                                 ColumnBalanceData&       aColData)
{
  aColData.Reset();
  bool allFit = true;
  bool RTL = GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL;
  bool shrinkingHeightOnly = !NS_SUBTREE_DIRTY(this) &&
    mLastBalanceHeight > aConfig.mColMaxHeight;
  
#ifdef DEBUG_roc
  printf("*** Doing column reflow pass: mLastBalanceHeight=%d, mColMaxHeight=%d, RTL=%d\n, mBalanceColCount=%d, mColWidth=%d, mColGap=%d\n",
         mLastBalanceHeight, aConfig.mColMaxHeight, RTL, aConfig.mBalanceColCount,
         aConfig.mColWidth, aConfig.mColGap);
#endif

  DrainOverflowColumns();
  
  if (mLastBalanceHeight != aConfig.mColMaxHeight) {
    mLastBalanceHeight = aConfig.mColMaxHeight;
    // XXX Seems like this could fire if incremental reflow pushed the column set
    // down so we reflow incrementally with a different available height.
    // We need a way to do an incremental reflow and be sure availableHeight
    // changes are taken account of! Right now I think block frames with absolute
    // children might exit early.
    //NS_ASSERTION(aKidReason != eReflowReason_Incremental,
    //             "incremental reflow should not have changed the balance height");
  }

  // get our border and padding
  const nsMargin &borderPadding = aReflowState.mComputedBorderPadding;
  
  nsRect contentRect(0, 0, 0, 0);
  nsOverflowAreas overflowRects;

  nsIFrame* child = mFrames.FirstChild();
  nsPoint childOrigin = nsPoint(borderPadding.left, borderPadding.top);
  // For RTL, figure out where the last column's left edge should be. Since the
  // columns might not fill the frame exactly, we need to account for the
  // slop. Otherwise we'll waste time moving the columns by some tiny
  // amount unnecessarily.
  nscoord targetX = borderPadding.left;
  if (RTL) {
    nscoord availWidth = aReflowState.availableWidth;
    if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
      availWidth = aReflowState.ComputedWidth();
    }
    if (availWidth != NS_INTRINSICSIZE) {
      childOrigin.x += availWidth - aConfig.mColWidth;
      targetX += aConfig.mExpectedWidthLeftOver;
#ifdef DEBUG_roc
      printf("*** childOrigin.x = %d\n", childOrigin.x);
#endif
    }
  }
  int columnCount = 0;
  int contentBottom = 0;
  bool reflowNext = false;

  while (child) {
    // Try to skip reflowing the child. We can't skip if the child is dirty. We also can't
    // skip if the next column is dirty, because the next column's first line(s)
    // might be pullable back to this column. We can't skip if it's the last child
    // because we need to obtain the bottom margin. We can't skip
    // if this is the last column and we're supposed to assign unbounded
    // height to it, because that could change the available height from
    // the last time we reflowed it and we should try to pull all the
    // content from its next sibling. (Note that it might be the last
    // column, but not be the last child because the desired number of columns
    // has changed.)
    bool skipIncremental = !aReflowState.ShouldReflowAllKids()
      && !NS_SUBTREE_DIRTY(child)
      && child->GetNextSibling()
      && !(aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1)
      && !NS_SUBTREE_DIRTY(child->GetNextSibling());
    // If we need to pull up content from the prev-in-flow then this is not just
    // a height shrink. The prev in flow will have set the dirty bit.
    // Check the overflow rect YMost instead of just the child's content height. The child
    // may have overflowing content that cares about the available height boundary.
    // (It may also have overflowing content that doesn't care about the available height
    // boundary, but if so, too bad, this optimization is defeated.)
    // We want scrollable overflow here since this is a calculation that
    // affects layout.
    bool skipResizeHeightShrink = shrinkingHeightOnly
      && child->GetScrollableOverflowRect().YMost() <= aConfig.mColMaxHeight;

    nscoord childContentBottom = 0;
    if (!reflowNext && (skipIncremental || skipResizeHeightShrink)) {
      // This child does not need to be reflowed, but we may need to move it
      MoveChildTo(this, child, childOrigin);
      
      // If this is the last frame then make sure we get the right status
      nsIFrame* kidNext = child->GetNextSibling();
      if (kidNext) {
        aStatus = (kidNext->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
                  ? NS_FRAME_OVERFLOW_INCOMPLETE
                  : NS_FRAME_NOT_COMPLETE;
      } else {
        aStatus = mLastFrameStatus;
      }
      childContentBottom = nsLayoutUtils::CalculateContentBottom(child);
#ifdef DEBUG_roc
      printf("*** Skipping child #%d %p (incremental %d, resize height shrink %d): status = %d\n",
             columnCount, (void*)child, skipIncremental, skipResizeHeightShrink, aStatus);
#endif
    } else {
      nsSize availSize(aConfig.mColWidth, aConfig.mColMaxHeight);
      
      if (aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1) {
        availSize.height = GetAvailableContentHeight(aReflowState);
      }
  
      if (reflowNext)
        child->AddStateBits(NS_FRAME_IS_DIRTY);

      nsHTMLReflowState kidReflowState(PresContext(), aReflowState, child,
                                       availSize, availSize.width,
                                       aReflowState.ComputedHeight());
      kidReflowState.mFlags.mIsTopOfPage = PR_TRUE;
      kidReflowState.mFlags.mTableIsSplittable = PR_FALSE;
          
#ifdef DEBUG_roc
      printf("*** Reflowing child #%d %p: availHeight=%d\n",
             columnCount, (void*)child,availSize.height);
#endif

      // Note if the column's next in flow is not being changed by this incremental reflow.
      // This may allow the current column to avoid trying to pull lines from the next column.
      if (child->GetNextSibling() &&
          !(GetStateBits() & NS_FRAME_IS_DIRTY) &&
        !(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY)) {
        kidReflowState.mFlags.mNextInFlowUntouched = PR_TRUE;
      }
    
      nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.mFlags);

      // XXX it would be cool to consult the float manager for the
      // previous block to figure out the region of floats from the
      // previous column that extend into this column, and subtract
      // that region from the new float manager.  So you could stick a
      // really big float in the first column and text in following
      // columns would flow around it.

      // Reflow the frame
      ReflowChild(child, PresContext(), kidDesiredSize, kidReflowState,
                  childOrigin.x + kidReflowState.mComputedMargin.left,
                  childOrigin.y + kidReflowState.mComputedMargin.top,
                  0, aStatus);

      reflowNext = (aStatus & NS_FRAME_REFLOW_NEXTINFLOW) != 0;
    
#ifdef DEBUG_roc
      printf("*** Reflowed child #%d %p: status = %d, desiredSize=%d,%d\n",
             columnCount, (void*)child, aStatus, kidDesiredSize.width, kidDesiredSize.height);
#endif

      NS_FRAME_TRACE_REFLOW_OUT("Column::Reflow", aStatus);

      *aBottomMarginCarriedOut = kidDesiredSize.mCarriedOutBottomMargin;
      
      FinishReflowChild(child, PresContext(), &kidReflowState, 
                        kidDesiredSize, childOrigin.x, childOrigin.y, 0);

      childContentBottom = nsLayoutUtils::CalculateContentBottom(child);
      if (childContentBottom > aConfig.mColMaxHeight) {
        allFit = PR_FALSE;
      }
      if (childContentBottom > availSize.height) {
        aColData.mMaxOverflowingHeight = NS_MAX(childContentBottom,
            aColData.mMaxOverflowingHeight);
      }
    }

    contentRect.UnionRect(contentRect, child->GetRect());

    ConsiderChildOverflow(overflowRects, child);
    contentBottom = NS_MAX(contentBottom, childContentBottom);
    aColData.mLastHeight = childContentBottom;
    aColData.mSumHeight += childContentBottom;

    // Build a continuation column if necessary
    nsIFrame* kidNextInFlow = child->GetNextInFlow();

    if (NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !NS_FRAME_IS_TRUNCATED(aStatus)) {
      NS_ASSERTION(!kidNextInFlow, "next in flow should have been deleted");
      child = nsnull;
      break;
    } else {
      ++columnCount;
      // Make sure that the column has a next-in-flow. If not, we must
      // create one to hold the overflowing stuff, even if we're just
      // going to put it on our overflow list and let *our*
      // next in flow handle it.
      if (!kidNextInFlow) {
        NS_ASSERTION(aStatus & NS_FRAME_REFLOW_NEXTINFLOW,
                     "We have to create a continuation, but the block doesn't want us to reflow it?");

        // We need to create a continuing column
        nsresult rv = CreateNextInFlow(PresContext(), child, kidNextInFlow);
        
        if (NS_FAILED(rv)) {
          NS_NOTREACHED("Couldn't create continuation");
          child = nsnull;
          break;
        }
      }

      // Make sure we reflow a next-in-flow when it switches between being
      // normal or overflow container
      if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
        if (!(kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
          aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
          reflowNext = PR_TRUE;
          kidNextInFlow->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
        }
      }
      else if (kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
        aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
        reflowNext = PR_TRUE;
        kidNextInFlow->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
      }
        
      if (columnCount >= aConfig.mBalanceColCount) {
        // No more columns allowed here. Stop.
        aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
        kidNextInFlow->AddStateBits(NS_FRAME_IS_DIRTY);
        
        // Move any of our leftover columns to our overflow list. Our
        // next-in-flow will eventually pick them up.
        const nsFrameList& continuationColumns = mFrames.RemoveFramesAfter(child);
        if (continuationColumns.NotEmpty()) {
          SetOverflowFrames(PresContext(), continuationColumns);
        }
        child = nsnull;
        break;
      }
    }

    if (PresContext()->HasPendingInterrupt()) {
      // Stop the loop now while |child| still points to the frame that bailed
      // out.  We could keep going here and condition a bunch of the code in
      // this loop on whether there's an interrupt, or even just keep going and
      // trying to reflow the blocks (even though we know they'll interrupt
      // right after their first line), but stopping now is conceptually the
      // simplest (and probably fastest) thing.
      break;
    }

    // Advance to the next column
    child = child->GetNextSibling();

    if (child) {
      if (!RTL) {
        childOrigin.x += aConfig.mColWidth + aConfig.mColGap;
      } else {
        childOrigin.x -= aConfig.mColWidth + aConfig.mColGap;
      }
      
#ifdef DEBUG_roc
      printf("*** NEXT CHILD ORIGIN.x = %d\n", childOrigin.x);
#endif
    }
  }

  if (PresContext()->CheckForInterrupt(this) &&
      (GetStateBits() & NS_FRAME_IS_DIRTY)) {
    // Mark all our kids starting with |child| dirty

    // Note that this is a CheckForInterrupt call, not a HasPendingInterrupt,
    // because we might have interrupted while reflowing |child|, and since
    // we're about to add a dirty bit to |child| we need to make sure that
    // |this| is scheduled to have dirty bits marked on it and its ancestors.
    // Otherwise, when we go to mark dirty bits on |child|'s ancestors we'll
    // bail out immediately, since it'll already have a dirty bit.
    for (; child; child = child->GetNextSibling()) {
      child->AddStateBits(NS_FRAME_IS_DIRTY);
    }
  }
  
  // If we're doing RTL, we need to make sure our last column is at the left-hand side of the frame.
  if (RTL && childOrigin.x != targetX) {
    overflowRects.Clear();
    contentRect = nsRect(0, 0, 0, 0);
    PRInt32 deltaX = targetX - childOrigin.x;
#ifdef DEBUG_roc
    printf("*** CHILDORIGIN.x = %d, targetX = %d, DELTAX = %d\n", childOrigin.x, targetX, deltaX);
#endif
    for (child = mFrames.FirstChild(); child; child = child->GetNextSibling()) {
      MoveChildTo(this, child, child->GetPosition() + nsPoint(deltaX, 0));
      ConsiderChildOverflow(overflowRects, child);
      contentRect.UnionRect(contentRect, child->GetRect());
    }
  }
  aColData.mMaxHeight = contentBottom;
  contentRect.height = NS_MAX(contentRect.height, contentBottom);
  mLastFrameStatus = aStatus;
  
  // contentRect included the borderPadding.left,borderPadding.top of the child rects
  contentRect -= nsPoint(borderPadding.left, borderPadding.top);
  
  nsSize contentSize = nsSize(contentRect.XMost(), contentRect.YMost());

  // Apply computed and min/max values
  if (aReflowState.ComputedHeight() != NS_INTRINSICSIZE) {
    contentSize.height = aReflowState.ComputedHeight();
  } else {
    if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxHeight) {
      contentSize.height = NS_MIN(aReflowState.mComputedMaxHeight, contentSize.height);
    }
    if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinHeight) {
      contentSize.height = NS_MAX(aReflowState.mComputedMinHeight, contentSize.height);
    }
  }
  if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
    contentSize.width = aReflowState.ComputedWidth();
  } else {
    if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxWidth) {
      contentSize.width = NS_MIN(aReflowState.mComputedMaxWidth, contentSize.width);
    }
    if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinWidth) {
      contentSize.width = NS_MAX(aReflowState.mComputedMinWidth, contentSize.width);
    }
  }
    
  aDesiredSize.height = borderPadding.top + contentSize.height +
    borderPadding.bottom;
  aDesiredSize.width = contentSize.width + borderPadding.left + borderPadding.right;
  aDesiredSize.mOverflowAreas = overflowRects;
  aDesiredSize.UnionOverflowAreasWithDesiredBounds();

#ifdef DEBUG_roc
  printf("*** DONE PASS feasible=%d\n", allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
         && !NS_FRAME_IS_TRUNCATED(aStatus));
#endif
  return allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
    && !NS_FRAME_IS_TRUNCATED(aStatus);
}
Example #2
0
NS_IMETHODIMP
nsFirstLetterFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aMetrics,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aReflowStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
  nsresult rv = NS_OK;

  // Grab overflow list
  DrainOverflowFrames(aPresContext);

  nsIFrame* kid = mFrames.FirstChild();

  // Setup reflow state for our child
  nsSize availSize(aReflowState.availableWidth, aReflowState.availableHeight);
  const nsMargin& bp = aReflowState.mComputedBorderPadding;
  nscoord lr = bp.left + bp.right;
  nscoord tb = bp.top + bp.bottom;
  NS_ASSERTION(availSize.width != NS_UNCONSTRAINEDSIZE,
               "should no longer use unconstrained widths");
  availSize.width -= lr;
  if (NS_UNCONSTRAINEDSIZE != availSize.height) {
    availSize.height -= tb;
  }

  // Reflow the child
  if (!aReflowState.mLineLayout) {
    // When there is no lineLayout provided, we provide our own. The
    // only time that the first-letter-frame is not reflowing in a
    // line context is when its floating.
    nsHTMLReflowState rs(aPresContext, aReflowState, kid, availSize);
    nsLineLayout ll(aPresContext, nsnull, &aReflowState, nsnull);
    ll.BeginLineReflow(bp.left, bp.top, availSize.width, NS_UNCONSTRAINEDSIZE,
                       PR_FALSE, PR_TRUE);
    rs.mLineLayout = &ll;
    ll.SetFirstLetterStyleOK(PR_TRUE);

    kid->WillReflow(aPresContext);
    kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);

    ll.EndLineReflow();
  }
  else {
    // Pretend we are a span and reflow the child frame
    nsLineLayout* ll = aReflowState.mLineLayout;
    PRBool        pushedFrame;

    NS_ASSERTION(ll->GetFirstLetterStyleOK() || GetPrevInFlow(),
                 "First-in-flow first-letter should have first-letter style enabled in nsLineLayout!");
    ll->BeginSpan(this, &aReflowState, bp.left, availSize.width);
    ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
    ll->EndSpan(this);
  }

  // Place and size the child and update the output metrics
  kid->SetRect(nsRect(bp.left, bp.top, aMetrics.width, aMetrics.height));
  kid->FinishAndStoreOverflow(&aMetrics);
  kid->DidReflow(aPresContext, nsnull, NS_FRAME_REFLOW_FINISHED);

  aMetrics.width += lr;
  aMetrics.height += tb;
  aMetrics.ascent += bp.top;
  mBaseline = aMetrics.ascent;

  // Ensure that the overflow rect contains the child textframe's overflow rect.
  // Note that if this is floating, the overline/underline drawable area is in
  // the overflow rect of the child textframe.
  aMetrics.mOverflowArea.UnionRect(aMetrics.mOverflowArea,
                           nsRect(0, 0, aMetrics.width, aMetrics.height));
  ConsiderChildOverflow(aMetrics.mOverflowArea, kid);

  // Create a continuation or remove existing continuations based on
  // the reflow completion status.
  if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
    if (aReflowState.mLineLayout) {
      aReflowState.mLineLayout->SetFirstLetterStyleOK(PR_FALSE);
    }
    nsIFrame* kidNextInFlow = kid->GetNextInFlow();
    if (kidNextInFlow) {
      // Remove all of the childs next-in-flows
      static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
        ->DeleteNextInFlowChild(aPresContext, kidNextInFlow);
    }
  }
  else {
    // Create a continuation for the child frame if it doesn't already
    // have one.
    nsIFrame* nextInFlow;
    rv = CreateNextInFlow(aPresContext, this, kid, nextInFlow);
    if (NS_FAILED(rv)) {
      return rv;
    }

    // And then push it to our overflow list
    if (nextInFlow) {
      kid->SetNextSibling(nsnull);
      SetOverflowFrames(aPresContext, nextInFlow);
    }
    else {
      nsIFrame* nextSib = kid->GetNextSibling();
      if (nextSib) {
        kid->SetNextSibling(nsnull);
        SetOverflowFrames(aPresContext, nextSib);
      }
    }
  }

  FinishAndStoreOverflow(&aMetrics);

  NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
  return rv;
}
Example #3
0
nsresult
nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
                                 const nsHTMLReflowState& aReflowState,
                                 InlineReflowState& irs,
                                 nsIFrame* aFrame,
                                 nsReflowStatus& aStatus)
{
  nsLineLayout* lineLayout = aReflowState.mLineLayout;
  PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
  PRBool pushedFrame;
  nsresult rv =
    lineLayout->ReflowFrame(aFrame, aStatus, nsnull, pushedFrame);
  
  if (NS_FAILED(rv)) {
    return rv;
  }
  if (NS_INLINE_IS_BREAK(aStatus)) {
    if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
      if (aFrame != mFrames.FirstChild()) {
        // Change break-before status into break-after since we have
        // already placed at least one child frame. This preserves the
        // break-type so that it can be propagated upward.
        aStatus = NS_FRAME_NOT_COMPLETE |
          NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
          (aStatus & NS_INLINE_BREAK_TYPE_MASK);
        PushFrames(aPresContext, aFrame, irs.mPrevFrame);
      }
      else {
        // Preserve reflow status when breaking-before our first child
        // and propagate it upward without modification.
        // Note: if we're lazily setting the frame pointer for our child 
        // frames, then we need to set it now. Don't return and leave the
        // remaining child frames in our child list with the wrong parent
        // frame pointer...
        if (irs.mSetParentPointer) {
          if (irs.mLineContainer && irs.mLineContainer->GetPrevContinuation()) {
            ReparentFloatsForInlineChild(irs.mLineContainer, aFrame->GetNextSibling(),
                                         PR_TRUE);
          }
          for (nsIFrame* f = aFrame->GetNextSibling(); f; f = f->GetNextSibling()) {
            f->SetParent(this);
          }
        }
      }
    }
    else {
      // Break-after
      if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
        nsIFrame* newFrame;
        rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
        if (NS_FAILED(rv)) {
          return rv;
        }
      }
      nsIFrame* nextFrame = aFrame->GetNextSibling();
      if (nextFrame) {
        NS_FRAME_SET_INCOMPLETE(aStatus);
        PushFrames(aPresContext, nextFrame, aFrame);
      }
      else if (nsnull != GetNextInFlow()) {
        // We must return an incomplete status if there are more child
        // frames remaining in a next-in-flow that follows this frame.
        nsInlineFrame* nextInFlow = (nsInlineFrame*) GetNextInFlow();
        while (nsnull != nextInFlow) {
          if (nextInFlow->mFrames.NotEmpty()) {
            NS_FRAME_SET_INCOMPLETE(aStatus);
            break;
          }
          nextInFlow = (nsInlineFrame*) nextInFlow->GetNextInFlow();
        }
      }
    }
  }
  else if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
    if (nsGkAtoms::placeholderFrame == aFrame->GetType()) {
      nsBlockReflowState* blockRS = lineLayout->mBlockRS;
      blockRS->mBlock->SplitPlaceholder(*blockRS, aFrame);
      // Allow the parent to continue reflowing
      aStatus = NS_FRAME_COMPLETE;
    }
    else {
      nsIFrame* newFrame;
      rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
      if (NS_FAILED(rv)) {
        return rv;
      }
      if (!reflowingFirstLetter) {
        nsIFrame* nextFrame = aFrame->GetNextSibling();
        if (nextFrame) {
          PushFrames(aPresContext, nextFrame, aFrame);
        }
      }
    }
  }
  return rv;
}