Exemple #1
0
void
nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
                                 const ReflowInput& aReflowInput,
                                 InlineReflowInput& irs,
                                 nsIFrame* aFrame,
                                 nsReflowStatus& aStatus)
{
  nsLineLayout* lineLayout = aReflowInput.mLineLayout;
  bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
  bool pushedFrame;
  aStatus.Reset();
  lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame);

  if (aStatus.IsInlineBreakBefore()) {
    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.
      StyleClear oldBreakType = aStatus.BreakType();
      aStatus.Reset();
      aStatus.SetIncomplete();
      aStatus.SetInlineLineBreakAfter(oldBreakType);
      PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs);
    }
    else {
      // Preserve reflow status when breaking-before our first child
      // and propagate it upward without modification.
    }
    return;
  }

  // Create a next-in-flow if needed.
  if (!aStatus.IsFullyComplete()) {
    CreateNextInFlow(aFrame);
  }

  if (aStatus.IsInlineBreakAfter()) {
    nsIFrame* nextFrame = aFrame->GetNextSibling();
    if (nextFrame) {
      aStatus.SetIncomplete();
      PushFrames(aPresContext, nextFrame, aFrame, irs);
    }
    else {
      // We must return an incomplete status if there are more child
      // frames remaining in a next-in-flow that follows this frame.
      nsInlineFrame* nextInFlow = static_cast<nsInlineFrame*>(GetNextInFlow());
      while (nextInFlow) {
        if (nextInFlow->mFrames.NotEmpty()) {
          aStatus.SetIncomplete();
          break;
        }
        nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
      }
    }
    return;
  }

  if (!aStatus.IsFullyComplete() && !reflowingFirstLetter) {
    nsIFrame* nextFrame = aFrame->GetNextSibling();
    if (nextFrame) {
      PushFrames(aPresContext, nextFrame, aFrame, irs);
    }
  }
}
Exemple #2
0
void
nsRubyFrame::ReflowSegment(nsPresContext* aPresContext,
                           const ReflowInput& aReflowInput,
                           nsRubyBaseContainerFrame* aBaseContainer,
                           nsReflowStatus& aStatus)
{
  WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  LogicalSize availSize(lineWM, aReflowInput.AvailableISize(),
                        aReflowInput.AvailableBSize());
  WritingMode rubyWM = GetWritingMode();
  NS_ASSERTION(!rubyWM.IsOrthogonalTo(lineWM),
               "Ruby frame writing-mode shouldn't be orthogonal to its line");

  AutoRubyTextContainerArray textContainers(aBaseContainer);
  const uint32_t rtcCount = textContainers.Length();

  ReflowOutput baseMetrics(aReflowInput);
  bool pushedFrame;
  aReflowInput.mLineLayout->ReflowFrame(aBaseContainer, aStatus,
                                        &baseMetrics, pushedFrame);

  if (aStatus.IsInlineBreakBefore()) {
    if (aBaseContainer != mFrames.FirstChild()) {
      // Some segments may have been reflowed before, hence it is not
      // a break-before for the ruby container.
      aStatus.Reset();
      aStatus.SetInlineLineBreakAfter();
      aStatus.SetIncomplete();
      PushChildrenToOverflow(aBaseContainer, aBaseContainer->GetPrevSibling());
      aReflowInput.mLineLayout->SetDirtyNextLine();
    }
    // This base container is not placed at all, we can skip all
    // text containers paired with it.
    return;
  }
  if (aStatus.IsIncomplete()) {
    // It always promise that if the status is incomplete, there is a
    // break occurs. Break before has been processed above. However,
    // it is possible that break after happens with the frame reflow
    // completed. It happens if there is a force break at the end.
    MOZ_ASSERT(aStatus.IsInlineBreakAfter());
    // Find the previous sibling which we will
    // insert new continuations after.
    nsIFrame* lastChild;
    if (rtcCount > 0) {
      lastChild = textContainers.LastElement();
    } else {
      lastChild = aBaseContainer;
    }

    // Create continuations for the base container
    nsIFrame* newBaseContainer = CreateNextInFlow(aBaseContainer);
    // newBaseContainer is null if there are existing next-in-flows.
    // We only need to move and push if there were not.
    if (newBaseContainer) {
      // Move the new frame after all the text containers
      mFrames.RemoveFrame(newBaseContainer);
      mFrames.InsertFrame(nullptr, lastChild, newBaseContainer);

      // Create continuations for text containers
      nsIFrame* newLastChild = newBaseContainer;
      for (uint32_t i = 0; i < rtcCount; i++) {
        nsIFrame* newTextContainer = CreateNextInFlow(textContainers[i]);
        MOZ_ASSERT(newTextContainer, "Next-in-flow of rtc should not exist "
                   "if the corresponding rbc does not");
        mFrames.RemoveFrame(newTextContainer);
        mFrames.InsertFrame(nullptr, newLastChild, newTextContainer);
        newLastChild = newTextContainer;
      }
    }
    if (lastChild != mFrames.LastChild()) {
      // Always push the next frame after the last child in this segment.
      // It is possible that we pulled it back before our next-in-flow
      // drain our overflow.
      PushChildrenToOverflow(lastChild->GetNextSibling(), lastChild);
      aReflowInput.mLineLayout->SetDirtyNextLine();
    }
  } else {
    // If the ruby base container is reflowed completely, the line
    // layout will remove the next-in-flows of that frame. But the
    // line layout is not aware of the ruby text containers, hence
    // it is necessary to remove them here.
    for (uint32_t i = 0; i < rtcCount; i++) {
      nsIFrame* nextRTC = textContainers[i]->GetNextInFlow();
      if (nextRTC) {
        nextRTC->GetParent()->DeleteNextInFlowChild(nextRTC, true);
      }
    }
  }

  nscoord segmentISize = baseMetrics.ISize(lineWM);
  const nsSize dummyContainerSize;
  LogicalRect baseRect =
    aBaseContainer->GetLogicalRect(lineWM, dummyContainerSize);
  // We need to position our rtc frames on one side or the other of the
  // base container's rect, using a coordinate space that's relative to
  // the ruby frame. Right now, the base container's rect's block-axis
  // position is relative to the block container frame containing the
  // lines, so we use 0 instead. (i.e. we assume that the base container
  // is adjacent to the ruby frame's block-start edge.)
  // XXX We may need to add border/padding here. See bug 1055667.
  baseRect.BStart(lineWM) = 0;
  // The rect for offsets of text containers.
  LogicalRect offsetRect = baseRect;
  RubyBlockLeadings descLeadings = aBaseContainer->GetDescendantLeadings();
  offsetRect.BStart(lineWM) -= descLeadings.mStart;
  offsetRect.BSize(lineWM) += descLeadings.mStart + descLeadings.mEnd;
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsRubyTextContainerFrame* textContainer = textContainers[i];
    WritingMode rtcWM = textContainer->GetWritingMode();
    nsReflowStatus textReflowStatus;
    ReflowOutput textMetrics(aReflowInput);
    ReflowInput textReflowInput(aPresContext, aReflowInput, textContainer,
                                      availSize.ConvertTo(rtcWM, lineWM));
    textContainer->Reflow(aPresContext, textMetrics,
                          textReflowInput, textReflowStatus);
    // Ruby text containers always return complete reflow status even when
    // they have continuations, because the breaking has already been
    // handled when reflowing the base containers.
    NS_ASSERTION(textReflowStatus.IsEmpty(),
                 "Ruby text container must not break itself inside");
    // The metrics is initialized with reflow state of this ruby frame,
    // hence the writing-mode is tied to rubyWM instead of rtcWM.
    LogicalSize size = textMetrics.Size(rubyWM).ConvertTo(lineWM, rubyWM);
    textContainer->SetSize(lineWM, size);

    nscoord reservedISize = RubyUtils::GetReservedISize(textContainer);
    segmentISize = std::max(segmentISize, size.ISize(lineWM) + reservedISize);

    uint8_t rubyPosition = textContainer->StyleText()->mRubyPosition;
    MOZ_ASSERT(rubyPosition == NS_STYLE_RUBY_POSITION_OVER ||
               rubyPosition == NS_STYLE_RUBY_POSITION_UNDER);
    Maybe<LogicalSide> side;
    if (rubyPosition == NS_STYLE_RUBY_POSITION_OVER) {
      side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirOver));
    } else if (rubyPosition == NS_STYLE_RUBY_POSITION_UNDER) {
      side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirUnder));
    } else {
      // XXX inter-character support in bug 1055672
      MOZ_ASSERT_UNREACHABLE("Unsupported ruby-position");
    }

    LogicalPoint position(lineWM);
    if (side.isSome()) {
      if (nsLayoutUtils::IsInterCharacterRubyEnabled() &&
          rtcWM.IsVerticalRL() &&
          lineWM.GetInlineDir() == WritingMode::eInlineLTR) {
        // Inter-character ruby annotations are only supported for vertical-rl
        // in ltr horizontal writing. Fall back to non-inter-character behavior
        // otherwise.
        LogicalPoint offset(lineWM, offsetRect.ISize(lineWM),
          offsetRect.BSize(lineWM) > size.BSize(lineWM) ?
          (offsetRect.BSize(lineWM) - size.BSize(lineWM)) / 2 : 0);
        position = offsetRect.Origin(lineWM) + offset;
        aReflowInput.mLineLayout->AdvanceICoord(size.ISize(lineWM));
      } else if (side.value() == eLogicalSideBStart) {
        offsetRect.BStart(lineWM) -= size.BSize(lineWM);
        offsetRect.BSize(lineWM) += size.BSize(lineWM);
        position = offsetRect.Origin(lineWM);
      } else if (side.value() == eLogicalSideBEnd) {
        position = offsetRect.Origin(lineWM) +
          LogicalPoint(lineWM, 0, offsetRect.BSize(lineWM));
        offsetRect.BSize(lineWM) += size.BSize(lineWM);
      } else {
        MOZ_ASSERT_UNREACHABLE("???");
      }
    }
    // Using a dummy container-size here, so child positioning may not be
    // correct. We will fix it in nsLineLayout after the whole line is
    // reflowed.
    FinishReflowChild(textContainer, aPresContext, textMetrics,
                      &textReflowInput, lineWM, position, dummyContainerSize, 0);
  }
  MOZ_ASSERT(baseRect.ISize(lineWM) == offsetRect.ISize(lineWM),
             "Annotations should only be placed on the block directions");

  nscoord deltaISize = segmentISize - baseMetrics.ISize(lineWM);
  if (deltaISize <= 0) {
    RubyUtils::ClearReservedISize(aBaseContainer);
  } else {
    RubyUtils::SetReservedISize(aBaseContainer, deltaISize);
    aReflowInput.mLineLayout->AdvanceICoord(deltaISize);
  }

  // Set block leadings of the base container
  nscoord startLeading = baseRect.BStart(lineWM) - offsetRect.BStart(lineWM);
  nscoord endLeading = offsetRect.BEnd(lineWM) - baseRect.BEnd(lineWM);
  // XXX When bug 765861 gets fixed, this warning should be upgraded.
  NS_WARNING_ASSERTION(startLeading >= 0 && endLeading >= 0,
                       "Leadings should be non-negative (because adding "
                       "ruby annotation can only increase the size)");
  mLeadings.Update(startLeading, endLeading);
}