C++ nsFrameList::IsEmpty方法代码示例

NS_IMETHODIMP
nsTableOuterFrame::AppendFrames(ChildListID     aListID,
                                nsFrameList&    aFrameList)
{
  nsresult rv;

  // We only have two child frames: the inner table and a caption frame.
  // The inner frame is provided when we're initialized, and it cannot change
  if (kCaptionList == aListID) {
    NS_ASSERTION(aFrameList.IsEmpty() ||
                 aFrameList.FirstChild()->GetType() == nsGkAtoms::tableCaptionFrame,
                 "appending non-caption frame to captionList");
    mCaptionFrames.AppendFrames(this, aFrameList);
    rv = NS_OK;

    // Reflow the new caption frame. It's already marked dirty, so
    // just tell the pres shell.
    PresContext()->PresShell()->
      FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                       NS_FRAME_HAS_DIRTY_CHILDREN);
  }
  else {
    NS_PRECONDITION(false, "unexpected child list");
    rv = NS_ERROR_UNEXPECTED;
  }

  return rv;
}

NS_IMETHODIMP
nsTableOuterFrame::InsertFrames(ChildListID     aListID,
                                nsIFrame*       aPrevFrame,
                                nsFrameList&    aFrameList)
{
  if (kCaptionList == aListID) {
    NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
                 "inserting after sibling frame with different parent");
    NS_ASSERTION(aFrameList.IsEmpty() ||
                 aFrameList.FirstChild()->GetType() == nsGkAtoms::tableCaptionFrame,
                 "inserting non-caption frame into captionList");
    mCaptionFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);

    // Reflow the new caption frame. It's already marked dirty, so
    // just tell the pres shell.
    PresContext()->PresShell()->
      FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                       NS_FRAME_HAS_DIRTY_CHILDREN);
    return NS_OK;
  }
  else {
    NS_PRECONDITION(!aPrevFrame, "invalid previous frame");
    return AppendFrames(aListID, aFrameList);
  }
}

void
nsMenuFrame::InsertFrames(ChildListID     aListID,
                          nsIFrame*       aPrevFrame,
                          nsFrameList&    aFrameList)
{
  if (!HasPopup() && (aListID == kPrincipalList || aListID == kPopupList)) {
    SetPopupFrame(aFrameList);
    if (HasPopup()) {
#ifdef DEBUG_LAYOUT
      nsBoxLayoutState state(PresContext());
      SetXULDebug(state, aFrameList, mState & NS_STATE_CURRENTLY_IN_DEBUG);
#endif

      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }

  if (aFrameList.IsEmpty())
    return;

  if (MOZ_UNLIKELY(aPrevFrame && aPrevFrame == GetPopup())) {
    aPrevFrame = nullptr;
  }

  nsBoxFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
}

// don't set mColCount here, it is done in AddColsToTable
NS_IMETHODIMP
nsTableColGroupFrame::SetInitialChildList(ChildListID     aListID,
                                          nsFrameList&    aChildList)
{
  if (!mFrames.IsEmpty()) {
    // We already have child frames which means we've already been
    // initialized
    NS_NOTREACHED("unexpected second call to SetInitialChildList");
    return NS_ERROR_UNEXPECTED;
  }
  if (aListID != kPrincipalList) {
    // All we know about is the principal child list.
    NS_NOTREACHED("unknown frame list");
    return NS_ERROR_INVALID_ARG;
  } 
  nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
  if (aChildList.IsEmpty()) {
    tableFrame->AppendAnonymousColFrames(this, GetSpan(), eColAnonymousColGroup, 
                                         false);
    return NS_OK; 
  }

  mFrames.AppendFrames(this, aChildList);
  return NS_OK;
}

nsresult
nsPopupSetFrame::AddPopupFrameList(nsFrameList& aPopupFrameList)
{
  while (!aPopupFrameList.IsEmpty()) {
    nsIFrame* f = aPopupFrameList.FirstChild();
    // Clears out prev/next sibling points appropriately. Every frame
    // in our popup list has null next and prev pointers, they're logically
    // each in their own list.
    aPopupFrameList.RemoveFrame(f);
    nsresult rv = AddPopupFrame(f);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  return NS_OK;
}

// don't set mColCount here, it is done in AddColsToTable
void
nsTableColGroupFrame::SetInitialChildList(ChildListID     aListID,
                                          nsFrameList&    aChildList)
{
  MOZ_ASSERT(mFrames.IsEmpty(),
             "unexpected second call to SetInitialChildList");
  MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list");
  if (aChildList.IsEmpty()) { 
    GetTableFrame()->AppendAnonymousColFrames(this, GetSpan(),
                                              eColAnonymousColGroup, false);
    return; 
  }

  mFrames.AppendFrames(this, aChildList);
}

void
nsTableWrapperFrame::AppendFrames(ChildListID     aListID,
                                  nsFrameList&    aFrameList)
{
  // We only have two child frames: the inner table and a caption frame.
  // The inner frame is provided when we're initialized, and it cannot change
  MOZ_ASSERT(kCaptionList == aListID, "unexpected child list");
  MOZ_ASSERT(aFrameList.IsEmpty() ||
             aFrameList.FirstChild()->IsTableCaption(),
             "appending non-caption frame to captionList");
  mCaptionFrames.AppendFrames(this, aFrameList);

  // Reflow the new caption frame. It's already marked dirty, so
  // just tell the pres shell.
  PresContext()->PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                                               NS_FRAME_HAS_DIRTY_CHILDREN);
}

NS_IMETHODIMP
nsMenuFrame::AppendFrames(nsIAtom*        aListName,
                          nsFrameList&    aFrameList)
{
  if (!mPopupFrame && (!aListName || aListName == nsGkAtoms::popupList)) {
    SetPopupFrame(aFrameList);
    if (mPopupFrame) {

#ifdef DEBUG_LAYOUT
      nsBoxLayoutState state(PresContext());
      SetDebug(state, aFrameList, mState & NS_STATE_CURRENTLY_IN_DEBUG);
#endif
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }

  if (aFrameList.IsEmpty())
    return NS_OK;

  return nsBoxFrame::AppendFrames(aListName, aFrameList); 
}

NS_IMETHODIMP
nsMenuFrame::AppendFrames(ChildListID     aListID,
                          nsFrameList&    aFrameList)
{
  if (!HasPopup() && (aListID == kPrincipalList || aListID == kPopupList)) {
    SetPopupFrame(aFrameList);
    if (HasPopup()) {

#ifdef DEBUG_LAYOUT
      nsBoxLayoutState state(PresContext());
      SetDebug(state, aFrameList, mState & NS_STATE_CURRENTLY_IN_DEBUG);
#endif
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                         NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }

  if (aFrameList.IsEmpty())
    return NS_OK;

  return nsBoxFrame::AppendFrames(aListID, aFrameList); 
}