C++ nsBoxLayoutState类代码示例

NS_IMETHODIMP
nsDeckFrame::DoLayout(nsBoxLayoutState& aState)
{
  // Make sure we tweak the state so it does not resize our children.
  // We will do that.
  uint32_t oldFlags = aState.LayoutFlags();
  aState.SetLayoutFlags(NS_FRAME_NO_SIZE_VIEW | NS_FRAME_NO_VISIBILITY);

  // do a normal layout
  nsresult rv = nsBoxFrame::DoLayout(aState);

  // run though each child. Hide all but the selected one
  nsIFrame* box = nsBox::GetChildBox(this);

  nscoord count = 0;
  while (box) 
  {
    // make collapsed children not show up
    if (count != mIndex) 
      HideBox(box);

    box = GetNextBox(box);
    count++;
  }

  aState.SetLayoutFlags(oldFlags);

  return rv;
}

nsresult
nsBox::SyncLayout(nsBoxLayoutState& aState)
{
  /*
  if (IsCollapsed()) {
    CollapseChild(aState, this, true);
    return NS_OK;
  }
  */
  

  if (GetStateBits() & NS_FRAME_IS_DIRTY)
     Redraw(aState);

  RemoveStateBits(NS_FRAME_HAS_DIRTY_CHILDREN | NS_FRAME_IS_DIRTY
                  | NS_FRAME_FIRST_REFLOW | NS_FRAME_IN_REFLOW);

  nsPresContext* presContext = aState.PresContext();

  uint32_t flags = 0;
  GetLayoutFlags(flags);

  uint32_t stateFlags = aState.LayoutFlags();

  flags |= stateFlags;

  nsRect visualOverflow;

  if (ComputesOwnOverflowArea()) {
    visualOverflow = GetVisualOverflowRect();
  }
  else {
    nsRect rect(nsPoint(0, 0), GetSize());
    nsOverflowAreas overflowAreas(rect, rect);
    if (!DoesClipChildren() && !IsCollapsed()) {
      // See if our child frames caused us to overflow after being laid
      // out. If so, store the overflow area.  This normally can't happen
      // in XUL, but it can happen with the CSS 'outline' property and
      // possibly with other exotic stuff (e.g. relatively positioned
      // frames in HTML inside XUL).
      nsLayoutUtils::UnionChildOverflow(this, overflowAreas);
    }

    FinishAndStoreOverflow(overflowAreas, GetSize());
    visualOverflow = overflowAreas.VisualOverflow();
  }

  nsIView* view = GetView();
  if (view) {
    // Make sure the frame's view is properly sized and positioned and has
    // things like opacity correct
    nsContainerFrame::SyncFrameViewAfterReflow(presContext, this, view,
                                               visualOverflow, flags);
  } 

  return NS_OK;
}

void
nsTextBoxFrame::CalcTextSize(nsBoxLayoutState& aBoxLayoutState)
{
    if (mNeedsRecalc)
    {
        nsSize size;
        nsPresContext* presContext = aBoxLayoutState.PresContext();
        nsIRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
        if (rendContext) {
            GetTextSize(presContext, *rendContext,
                        mTitle, size, mAscent);
            mTextSize = size;
            mNeedsRecalc = PR_FALSE;
        }
    }
}

NS_IMETHODIMP
nsTextBoxFrame::DoLayout(nsBoxLayoutState& aBoxLayoutState)
{
    if (mNeedsReflowCallback) {
        nsIReflowCallback* cb = new nsAsyncAccesskeyUpdate(this);
        if (cb) {
            PresContext()->PresShell()->PostReflowCallback(cb);
        }
        mNeedsReflowCallback = PR_FALSE;
    }

    mState |= NS_STATE_NEED_LAYOUT;

    nsresult rv = nsLeafBoxFrame::DoLayout(aBoxLayoutState);

    const nsStyleText* textStyle = GetStyleText();
    if (textStyle->mTextShadow) {
      nsPoint origin(0,0);
      nsRect textRect = CalcTextRect(*aBoxLayoutState.GetRenderingContext(), origin);
      nsRect overflowRect(nsLayoutUtils::GetTextShadowRectsUnion(textRect, this));
      overflowRect.UnionRect(overflowRect, nsRect(nsPoint(0, 0), GetSize()));
      FinishAndStoreOverflow(&overflowRect, GetSize());
    }
    return rv;
}

/*
 * Run down through our children dirtying them recursively.
 */
void
nsGridRowGroupLayout::DirtyRows(nsIBox* aBox, nsBoxLayoutState& aState)
{
  if (aBox) {
    // mark us dirty
    // XXXldb We probably don't want to walk up the ancestor chain
    // calling MarkIntrinsicWidthsDirty for every row group.
    aState.PresShell()->FrameNeedsReflow(aBox, nsIPresShell::eTreeChange,
                                         NS_FRAME_IS_DIRTY);
    nsIBox* child = aBox->GetChildBox();

    while(child) {

      // walk into scrollframes
      nsIBox* deepChild = nsGrid::GetScrolledBox(child);

      // walk into other monuments
      nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);
      if (monument) 
        monument->DirtyRows(deepChild, aState);

      child = child->GetNextBox();
    }
  }
}

NS_IMETHODIMP
nsListBoxBodyFrame::DoLayout(nsBoxLayoutState& aBoxLayoutState)
{
  if (mScrolling)
    aBoxLayoutState.SetPaintingDisabled(PR_TRUE);

  nsresult rv = nsBoxFrame::DoLayout(aBoxLayoutState);

  if (mScrolling)
    aBoxLayoutState.SetPaintingDisabled(PR_FALSE);

  // if we are scrolled and the row height changed
  // make sure we are scrolled to a correct index.
  if (mAdjustScroll)
     PostReflowCallback();

  return rv;
}

void
nsGridRowLeafLayout::DirtyRows(nsIBox* aBox, nsBoxLayoutState& aState)
{
  if (aBox) {
    // mark us dirty
    // XXXldb We probably don't want to walk up the ancestor chain
    // calling MarkIntrinsicWidthsDirty for every row.
    aState.PresShell()->FrameNeedsReflow(aBox, nsIPresShell::eTreeChange,
                                         NS_FRAME_IS_DIRTY);
  }
}

void
nsSplitterFrameInner::SetPreferredSize(nsBoxLayoutState& aState, nsIBox* aChildBox, nscoord aOnePixel, PRBool aIsHorizontal, nscoord* aSize)
{
  //printf("current=%d, pref=%d", current/onePixel, pref/onePixel);
 
  nscoord current = 0;

  nsRect rect(aChildBox->GetRect());
  if (aIsHorizontal) 
    current = rect.width;
  else
    current = rect.height;

  nscoord pref = 0;

  if (!aSize)
  {
    if (aIsHorizontal) 
      pref = rect.width;
    else
      pref = rect.height;
  } else {
    pref = *aSize;
  }

  nsMargin margin(0,0,0,0);
  aChildBox->GetMargin(margin);

  nsCOMPtr<nsIAtom> attribute;

  if (aIsHorizontal) {
    pref -= (margin.left + margin.right);
    attribute = nsGkAtoms::width;
  } else {
    pref -= (margin.top + margin.bottom);
    attribute = nsGkAtoms::height;
  }

  nsIContent* content = aChildBox->GetContent();

  // set its preferred size.
  nsAutoString prefValue;
  prefValue.AppendInt(pref/aOnePixel);
  if (content->AttrValueIs(kNameSpaceID_None, attribute,
                           prefValue, eCaseMatters))
     return;

  nsWeakFrame weakBox(aChildBox);
  content->SetAttr(kNameSpaceID_None, attribute, prefValue, PR_TRUE);
  ENSURE_TRUE(weakBox.IsAlive());
  aState.PresShell()->FrameNeedsReflow(aChildBox, nsIPresShell::eStyleChange,
                                       NS_FRAME_IS_DIRTY);
}

nsresult
nsIFrame::Redraw(nsBoxLayoutState& aState)
{
  if (aState.PaintingDisabled())
    return NS_OK;

  // nsStackLayout, at least, expects us to repaint descendants even
  // if a damage rect is provided
  InvalidateFrameSubtree();

  return NS_OK;
}

void
nsPopupSetFrame::RepositionPopup(nsPopupFrameList* aEntry, nsBoxLayoutState& aState)
{
  // Sync up the view.
  if (aEntry && aEntry->mElementContent) {
    nsIFrame* frameToSyncTo = nsnull;
    nsPresContext* presContext = aState.PresContext();
    presContext->PresShell()->GetPrimaryFrameFor(aEntry->mElementContent,
                                                 &frameToSyncTo );
    ((nsMenuPopupFrame*)(aEntry->mPopupFrame))->SyncViewWithFrame(presContext, 
          aEntry->mPopupAnchor, aEntry->mPopupAlign, frameToSyncTo, aEntry->mXPos, aEntry->mYPos);
  }
}

NS_IMETHODIMP
nsListBoxBodyFrame::DoXULLayout(nsBoxLayoutState& aBoxLayoutState)
{
  if (mScrolling)
    aBoxLayoutState.SetPaintingDisabled(true);

  nsresult rv = nsBoxFrame::DoXULLayout(aBoxLayoutState);

  // determine the real height for the scrollable area from the total number
  // of rows, since non-visible rows don't yet have frames
  nsRect rect(nsPoint(0, 0), GetSize());
  nsOverflowAreas overflow(rect, rect);
  if (mLayoutManager) {
    nsIFrame* childFrame = mFrames.FirstChild();
    while (childFrame) {
      ConsiderChildOverflow(overflow, childFrame);
      childFrame = childFrame->GetNextSibling();
    }

    nsSize prefSize = mLayoutManager->GetXULPrefSize(this, aBoxLayoutState);
    NS_FOR_FRAME_OVERFLOW_TYPES(otype) {
      nsRect& o = overflow.Overflow(otype);
      o.height = std::max(o.height, prefSize.height);
    }
  }
  FinishAndStoreOverflow(overflow, GetSize());

  if (mScrolling)
    aBoxLayoutState.SetPaintingDisabled(false);

  // if we are scrolled and the row height changed
  // make sure we are scrolled to a correct index.
  if (mAdjustScroll)
     PostReflowCallback();

  return rv;
}

nsSize
nsBox::GetMinSize(nsBoxLayoutState& aState)
{
  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");

  nsSize min(0,0);
  DISPLAY_MIN_SIZE(this, min);

  if (IsCollapsed(aState))
    return min;

  AddBorderAndPadding(min);
  nsIBox::AddCSSMinSize(aState, this, min);
  return min;
}

nsSize
nsBox::GetMaxSize(nsBoxLayoutState& aState)
{
  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");

  nsSize maxSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
  DISPLAY_MAX_SIZE(this, maxSize);

  if (IsCollapsed(aState))
    return maxSize;

  AddBorderAndPadding(maxSize);
  nsIBox::AddCSSMaxSize(aState, this, maxSize);
  return maxSize;
}

nsSize
nsBox::GetXULMinSize(nsBoxLayoutState& aState)
{
  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");

  nsSize min(0,0);
  DISPLAY_MIN_SIZE(this, min);

  if (IsXULCollapsed())
    return min;

  AddBorderAndPadding(min);
  bool widthSet, heightSet;
  nsIFrame::AddXULMinSize(aState, this, min, widthSet, heightSet);
  return min;
}

nsSize
nsBox::GetXULMaxSize(nsBoxLayoutState& aState)
{
  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");

  nsSize maxSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
  DISPLAY_MAX_SIZE(this, maxSize);

  if (IsXULCollapsed())
    return maxSize;

  AddBorderAndPadding(maxSize);
  bool widthSet, heightSet;
  nsIFrame::AddXULMaxSize(this, maxSize, widthSet, heightSet);
  return maxSize;
}