C++ nsFloatCacheFreeList类代码示例

/**
 * Place below-current-line floats.
 */
void
nsBlockReflowState::PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aList,
                                                nsLineBox* aLine)
{
  nsFloatCache* fc = aList.Head();
  while (fc) {
#ifdef DEBUG
    if (nsBlockFrame::gNoisyReflow) {
      nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
      printf("placing bcl float: ");
      nsFrame::ListTag(stdout, fc->mFloat);
      printf("\n");
    }
#endif
    // Place the float
    bool placed = FlowAndPlaceFloat(fc->mFloat);
    nsFloatCache *next = fc->Next();
    if (!placed) {
      aList.Remove(fc);
      delete fc;
      aLine->SetHadFloatPushed();
    }
    fc = next;
  }
}

// XXX this might be too eager to free memory
void
nsLineBox::FreeFloats(nsFloatCacheFreeList& aFreeList)
{
  NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
  if (IsInline() && mInlineData) {
    if (mInlineData->mFloats.NotEmpty()) {
      aFreeList.Append(mInlineData->mFloats);
    }
    MaybeFreeData();
  }
}

void
nsLineBox::AppendFloats(nsFloatCacheFreeList& aFreeList)
{ 
  NS_ABORT_IF_FALSE(IsInline(), "block line can't have floats");
  if (IsInline()) {
    if (aFreeList.NotEmpty()) {
      if (!mInlineData) {
        mInlineData = new ExtraInlineData(mBounds);
      }
      mInlineData->mFloats.Append(aFreeList);
    }
  }
}

void
nsLineBox::AppendFloats(nsFloatCacheFreeList& aFreeList)
{ 
  MOZ_ASSERT(IsInline(), "block line can't have floats");
  if (IsInline()) {
    if (aFreeList.NotEmpty()) {
      if (!mInlineData) {
        mInlineData = new ExtraInlineData(GetPhysicalBounds());
      }
      mInlineData->mFloats.Append(aFreeList);
    }
  }
}

/**
 * Place below-current-line floats.
 */
PRBool
nsBlockReflowState::PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aList, PRBool aForceFit)
{
  nsFloatCache* fc = aList.Head();
  while (fc) {
    {
#ifdef DEBUG
      if (nsBlockFrame::gNoisyReflow) {
        nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
        printf("placing bcl float: ");
        nsFrame::ListTag(stdout, fc->mPlaceholder->GetOutOfFlowFrame());
        printf("\n");
      }
#endif
      // Place the float
      PRBool isLeftFloat;
      nsReflowStatus reflowStatus;
      PRBool placed = FlowAndPlaceFloat(fc, &isLeftFloat, reflowStatus, aForceFit);
      NS_ASSERTION(placed || !aForceFit,
                   "If we're in force-fit mode, we should have placed the float");

      if (!placed || (NS_FRAME_IS_TRUNCATED(reflowStatus) && !aForceFit)) {
        // return before processing all of the floats, since the line will be pushed.
        return PR_FALSE;
      }
      else if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus)) {
        // Create a continuation for the incomplete float and its placeholder.
        nsresult rv = mBlock->SplitPlaceholder(*this, fc->mPlaceholder);
        if (NS_FAILED(rv)) 
          return PR_FALSE;
      } else {
        // XXX We could deal with truncated frames better by breaking before
        // the associated placeholder
        NS_WARN_IF_FALSE(!NS_FRAME_IS_TRUNCATED(reflowStatus),
                         "This situation currently leads to data not printing");

        // Float is complete. We need to delete any leftover placeholders now.
        nsIFrame* nextPlaceholder = fc->mPlaceholder->GetNextInFlow();
        if (nextPlaceholder) {
          nsHTMLContainerFrame* parent =
            static_cast<nsHTMLContainerFrame*>(nextPlaceholder->GetParent());
          parent->DeleteNextInFlowChild(mPresContext, nextPlaceholder);
        }
      }
    }
    fc = fc->Next();
  }
  return PR_TRUE;
}

void
nsFloatCacheList::Append(nsFloatCacheFreeList& aList)
{
  NS_PRECONDITION(aList.NotEmpty(), "Appending empty list will fail");
  
  nsFloatCache* tail = Tail();
  if (tail) {
    NS_ASSERTION(!tail->mNext, "Bogus!");
    tail->mNext = aList.mHead;
  }
  else {
    NS_ASSERTION(!mHead, "Bogus!");
    mHead = aList.mHead;
  }
  aList.mHead = nsnull;
  aList.mTail = nsnull;
}

/**
 * Place below-current-line floats.
 */
PRBool
nsBlockReflowState::PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aList, PRBool aForceFit)
{
  nsFloatCache* fc = aList.Head();
  while (fc) {
    {
#ifdef DEBUG
      if (nsBlockFrame::gNoisyReflow) {
        nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
        printf("placing bcl float: ");
        nsFrame::ListTag(stdout, fc->mFloat);
        printf("\n");
      }
#endif
      // Place the float
      nsReflowStatus reflowStatus;
      PRBool placed = FlowAndPlaceFloat(fc->mFloat, reflowStatus, aForceFit);
      NS_ASSERTION(placed || !aForceFit,
                   "If we're in force-fit mode, we should have placed the float");

      if (!placed || (NS_FRAME_IS_TRUNCATED(reflowStatus) && !aForceFit)) {
        // return before processing all of the floats, since the line will be pushed.
        return PR_FALSE;
      }
      else if (!NS_FRAME_IS_FULLY_COMPLETE(reflowStatus)) {
        // Create a continuation for the incomplete float
        nsresult rv = mBlock->SplitFloat(*this, fc->mFloat, reflowStatus);
        if (NS_FAILED(rv))
          return PR_FALSE;
      } else {
        // XXX We could deal with truncated frames better by breaking before
        // the associated placeholder
        NS_WARN_IF_FALSE(!NS_FRAME_IS_TRUNCATED(reflowStatus),
                         "This situation currently leads to data not printing");
        // Float is complete.
      }
    }
    fc = fc->Next();
  }
  return PR_TRUE;
}