C++ nsIFrame::GetStateBits方法代码示例

void
nsSplitterFrameInner::EnsureOrient()
{
  bool isHorizontal = !(mParentBox->GetStateBits() & NS_STATE_IS_HORIZONTAL);
  if (isHorizontal)
    mOuter->mState |= NS_STATE_IS_HORIZONTAL;
  else
    mOuter->mState &= ~NS_STATE_IS_HORIZONTAL;
}

bool
PaintFrameCallback::operator()(gfxContext* aContext,
                               const gfxRect& aFillRect,
                               const gfxPattern::GraphicsFilter& aFilter,
                               const gfxMatrix& aTransform)
{
  if (mFrame->GetStateBits() & NS_FRAME_DRAWING_AS_PAINTSERVER)
    return false;

  mFrame->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);

  nsRenderingContext context;
  context.Init(mFrame->PresContext()->DeviceContext(), aContext);
  aContext->Save();

  // Clip to aFillRect so that we don't paint outside.
  aContext->NewPath();
  aContext->Rectangle(aFillRect);
  aContext->Clip();
  gfxMatrix savedMatrix(aContext->CurrentMatrix());

  aContext->Multiply(gfxMatrix(aTransform).Invert());

  // nsLayoutUtils::PaintFrame will anchor its painting at mFrame. But we want
  // to have it anchored at the top left corner of the bounding box of all of
  // mFrame's continuations. So we add a translation transform.
  nsRect bbox = nsSVGIntegrationUtils::GetNonSVGUserSpace(mFrame);
  PRInt32 appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
  gfxPoint offset = gfxPoint(bbox.x, bbox.y) / appUnitsPerDevPixel;
  aContext->Multiply(gfxMatrix().Translate(-offset));

  gfxSize paintServerSize =
    gfxSize(mPaintServerSize.width, mPaintServerSize.height) /
      mFrame->PresContext()->AppUnitsPerDevPixel();

  // nsLayoutUtils::PaintFrame wants to render with paintServerSize, but we
  // want it to render with mRenderSize, so we need to set up a scale transform.
  gfxFloat scaleX = mRenderSize.width / paintServerSize.width;
  gfxFloat scaleY = mRenderSize.height / paintServerSize.height;
  gfxMatrix scaleMatrix = gfxMatrix().Scale(scaleX, scaleY);
  aContext->Multiply(scaleMatrix);

  // Draw.
  nsRect dirty(bbox.x, bbox.y, mPaintServerSize.width, mPaintServerSize.height);
  nsLayoutUtils::PaintFrame(&context, mFrame,
                            dirty, NS_RGBA(0, 0, 0, 0),
                            nsLayoutUtils::PAINT_IN_TRANSFORM |
                            nsLayoutUtils::PAINT_ALL_CONTINUATIONS);

  aContext->SetMatrix(savedMatrix);
  aContext->Restore();

  mFrame->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);

  return true;
}

bool
PaintFrameCallback::operator()(gfxContext* aContext,
                               const gfxRect& aFillRect,
                               const Filter& aFilter,
                               const gfxMatrix& aTransform)
{
  if (mFrame->GetStateBits() & NS_FRAME_DRAWING_AS_PAINTSERVER)
    return false;

  mFrame->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);

  aContext->Save();

  // Clip to aFillRect so that we don't paint outside.
  aContext->NewPath();
  aContext->Rectangle(aFillRect);
  aContext->Clip();

  gfxMatrix invmatrix = aTransform;
  if (!invmatrix.Invert()) {
    return false;
  }
  aContext->Multiply(invmatrix);

  // nsLayoutUtils::PaintFrame will anchor its painting at mFrame. But we want
  // to have it anchored at the top left corner of the bounding box of all of
  // mFrame's continuations. So we add a translation transform.
  int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
  nsPoint offset = GetOffsetToBoundingBox(mFrame);
  gfxPoint devPxOffset = gfxPoint(offset.x, offset.y) / appUnitsPerDevPixel;
  aContext->Multiply(gfxMatrix::Translation(devPxOffset));

  gfxSize paintServerSize =
    gfxSize(mPaintServerSize.width, mPaintServerSize.height) /
      mFrame->PresContext()->AppUnitsPerDevPixel();

  // nsLayoutUtils::PaintFrame wants to render with paintServerSize, but we
  // want it to render with mRenderSize, so we need to set up a scale transform.
  gfxFloat scaleX = mRenderSize.width / paintServerSize.width;
  gfxFloat scaleY = mRenderSize.height / paintServerSize.height;
  aContext->Multiply(gfxMatrix::Scaling(scaleX, scaleY));

  // Draw.
  nsRect dirty(-offset.x, -offset.y,
               mPaintServerSize.width, mPaintServerSize.height);

  uint32_t flags = nsLayoutUtils::PAINT_IN_TRANSFORM;
  if (mFlags & nsSVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES) {
    flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
  }
  nsRenderingContext context(aContext);
  nsLayoutUtils::PaintFrame(&context, mFrame,
                            dirty, NS_RGBA(0, 0, 0, 0),
                            flags);

  nsIFrame* currentFrame = mFrame;
   while ((currentFrame = currentFrame->GetNextContinuation()) != nullptr) {
    offset = currentFrame->GetOffsetToCrossDoc(mFrame);
    devPxOffset = gfxPoint(offset.x, offset.y) / appUnitsPerDevPixel;

    aContext->Save();
    aContext->Multiply(gfxMatrix::Scaling(1/scaleX, 1/scaleY));
    aContext->Multiply(gfxMatrix::Translation(devPxOffset));
    aContext->Multiply(gfxMatrix::Scaling(scaleX, scaleY));

    nsLayoutUtils::PaintFrame(&context, currentFrame,
                              dirty - offset, NS_RGBA(0, 0, 0, 0),
                              flags);

    aContext->Restore();
  }

  aContext->Restore();

  mFrame->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);

  return true;
}

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

  // Initialize OUT parameter
  aStatus = NS_FRAME_COMPLETE;

  // Should we create a space manager?
  nsAutoSpaceManager autoSpaceManager(NS_CONST_CAST(nsHTMLReflowState &, aReflowState));

  // XXXldb If we start storing the space manager in the frame rather
  // than keeping it around only during reflow then we should create it
  // only when there are actually floats to manage.  Otherwise things
  // like tables will gain significant bloat.
  if (NS_BLOCK_SPACE_MGR & mState)
    autoSpaceManager.CreateSpaceManagerFor(aPresContext, this);

  
  //------------ Handle Incremental Reflow -----------------
  PRBool reflowContent = PR_TRUE;
  PRBool reflowLegend = PR_TRUE;
  nsReflowReason reason = aReflowState.reason;

  if (reason == eReflowReason_Incremental) {
      nsHTMLReflowCommand *command = aReflowState.path->mReflowCommand;

      // See if it's targeted at us
      if (command) {
        nsReflowType  reflowType;
        command->GetType(reflowType);

        switch (reflowType) {
          case eReflowType_StyleChanged:
            reason = eReflowReason_StyleChange;
            break;

          case eReflowType_ReflowDirty: 
            reason = eReflowReason_Dirty;
            break;

          default:
            NS_ERROR("Unexpected Reflow Type");
        }
      } else {
           reflowContent = PR_FALSE;
           reflowLegend = PR_FALSE;

           nsReflowPath::iterator iter = aReflowState.path->FirstChild();
           nsReflowPath::iterator end = aReflowState.path->EndChildren();

           for ( ; iter != end; ++iter) {
               if (*iter == mLegendFrame)
                   reflowLegend = PR_TRUE;
               else if (*iter == mContentFrame)
                   reflowContent = PR_TRUE;
           }
      }
  }

  if (aDesiredSize.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
    reflowLegend = PR_TRUE;
    reflowContent = PR_TRUE;
  } else if (reason == eReflowReason_Dirty) {
    // if dirty then check dirty flags
    if (GetStateBits() & NS_FRAME_IS_DIRTY) {
      reflowLegend = PR_TRUE;
      reflowContent = PR_TRUE;
    } else {
      if (reflowContent) {
        reflowContent = mContentFrame ?
          (mContentFrame->GetStateBits()
           & (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) != 0 : PR_FALSE;
      }

      if (reflowLegend) {
        reflowLegend = mLegendFrame ?
          (mLegendFrame->GetStateBits()
           & (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) != 0 : PR_FALSE;
      }
    }
  }

  // availSize could have unconstrained values, don't perform any addition on them
  nsSize availSize(aReflowState.mComputedWidth, aReflowState.availableHeight);

  // get our border and padding
  const nsMargin &borderPadding = aReflowState.mComputedBorderPadding;
  const nsMargin &padding       = aReflowState.mComputedPadding;
  nsMargin border = borderPadding - padding;
  if (aDesiredSize.mComputeMEW) {
    aDesiredSize.mMaxElementWidth = borderPadding.left + borderPadding.right;
  }
  

  // Figure out how big the legend is if there is one. 
//.........这里部分代码省略.........