gecko-dev/layout/forms/nsFieldSetFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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// YY need to pass isMultiple before create called

//#include "nsFormControlFrame.h"
#include "nsHTMLContainerFrame.h"
#include "nsLegendFrame.h"
#include "nsIDOMNode.h"
#include "nsIDOMHTMLFieldSetElement.h"
#include "nsIDOMHTMLLegendElement.h"
#include "nsCSSRendering.h"
//#include "nsIDOMHTMLCollection.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsISupports.h"
#include "nsIAtom.h"
#include "nsIPresContext.h"
#include "nsHTMLParts.h"
#include "nsHTMLAtoms.h"
#include "nsLayoutAtoms.h"
#include "nsStyleConsts.h"
#include "nsFont.h"
#include "nsCOMPtr.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsSpaceManager.h"

class nsLegendFrame;

class nsFieldSetFrame : public nsHTMLContainerFrame {
public:

  nsFieldSetFrame();

  NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
                                 nsIAtom*        aListName,
                                 nsIFrame*       aChildList);

  NS_IMETHOD Reflow(nsIPresContext* aPresContext,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus);
                               
  NS_METHOD Paint(nsIPresContext*      aPresContext,
                  nsIRenderingContext& aRenderingContext,
                  const nsRect&        aDirtyRect,
                  nsFramePaintLayer    aWhichLayer,
                  PRUint32             aFlags);

  NS_IMETHOD  AppendFrames(nsIPresContext* aPresContext,
                           nsIPresShell&   aPresShell,
                           nsIAtom*        aListName,
                           nsIFrame*       aFrameList);
  NS_IMETHOD  InsertFrames(nsIPresContext* aPresContext,
                           nsIPresShell&   aPresShell,
                           nsIAtom*        aListName,
                           nsIFrame*       aPrevFrame,
                           nsIFrame*       aFrameList);
  NS_IMETHOD  RemoveFrame(nsIPresContext* aPresContext,
                          nsIPresShell&   aPresShell,
                          nsIAtom*        aListName,
                          nsIFrame*       aOldFrame);
  NS_IMETHOD  ReplaceFrame(nsIPresContext* aPresContext,
                           nsIPresShell&   aPresShell,
                           nsIAtom*        aListName,
                           nsIFrame*       aOldFrame,
                           nsIFrame*       aNewFrame);
  NS_IMETHOD  GetFrameForPoint(nsIPresContext*   aPresContext,
                               const nsPoint&    aPoint, 
                               nsFramePaintLayer aWhichLayer,
                               nsIFrame**        aFrame);
  virtual nsIAtom* GetType() const;

#ifdef ACCESSIBILITY  
  NS_IMETHOD  GetAccessible(nsIAccessible** aAccessible);
#endif

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const {
    return MakeFrameName(NS_LITERAL_STRING("FieldSet"), aResult);
  }
#endif

protected:

  virtual PRIntn GetSkipSides() const;

  nsIFrame* mLegendFrame;
  nsIFrame* mContentFrame;
  nsRect    mLegendRect;
  nscoord   mLegendSpace;
};

nsresult
NS_NewFieldSetFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame, PRUint32 aStateFlags )
{
  NS_PRECONDITION(aNewFrame, "null OUT ptr");
  if (nsnull == aNewFrame) {
    return NS_ERROR_NULL_POINTER;
  }
  nsFieldSetFrame* it = new (aPresShell) nsFieldSetFrame;
  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  // set the state flags (if any are provided)
  it->AddStateBits(aStateFlags);
  
  *aNewFrame = it;
  return NS_OK;
}

nsFieldSetFrame::nsFieldSetFrame()
  : nsHTMLContainerFrame()
{
  mContentFrame    = nsnull;
  mLegendFrame     = nsnull;
  mLegendSpace   = 0;
}


nsIAtom*
nsFieldSetFrame::GetType() const
{
  return nsLayoutAtoms::fieldSetFrame;
}

NS_IMETHODIMP
nsFieldSetFrame::SetInitialChildList(nsIPresContext* aPresContext,
                                     nsIAtom*        aListName,
                                     nsIFrame*       aChildList)
{
 
  // get the content and legend frames.
  mContentFrame = aChildList;
  mLegendFrame = mContentFrame->GetNextSibling();

  // Queue up the frames for the content frame
  return nsHTMLContainerFrame::SetInitialChildList(aPresContext, nsnull, aChildList);
}

// this is identical to nsHTMLContainerFrame::Paint except for the background and border. 
NS_IMETHODIMP
nsFieldSetFrame::Paint(nsIPresContext*      aPresContext,
                       nsIRenderingContext& aRenderingContext,
                       const nsRect&        aDirtyRect,
                       nsFramePaintLayer    aWhichLayer,
                       PRUint32             aFlags)
{
  if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
    // Paint our background and border
    PRBool isVisible;
    if (NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext, PR_TRUE, &isVisible)) && 
                     isVisible && mRect.width && mRect.height) {
      PRIntn skipSides = GetSkipSides();
      const nsStyleBorder* borderStyle = GetStyleBorder();
      const nsStylePadding* paddingStyle = GetStylePadding();
       
        nsMargin border;
        if (!borderStyle->GetBorder(border)) {
          NS_NOTYETIMPLEMENTED("percentage border");
        }

        nscoord yoff = 0;
        
        // if the border is smaller than the legend. Move the border down
        // to be centered on the legend. 
        if (border.top < mLegendRect.height)
            yoff = (mLegendRect.height - border.top)/2;
       
        nsRect rect(0, yoff, mRect.width, mRect.height - yoff);

        nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, this,
                                        aDirtyRect, rect, *borderStyle,
                                        *paddingStyle, PR_TRUE);

        if (mLegendFrame) {

          // we should probably use PaintBorderEdges to do this but for now just use clipping
          // to achieve the same effect.

          // draw left side
          nsRect clipRect(rect);
          clipRect.width = mLegendRect.x - rect.x;
          clipRect.height = border.top;

          aRenderingContext.PushState();
          aRenderingContext.SetClipRect(clipRect, nsClipCombine_kIntersect);
          nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
                                      aDirtyRect, rect, *borderStyle, mStyleContext, skipSides);
  
          aRenderingContext.PopState();


          // draw right side
          clipRect = rect;
          clipRect.x = mLegendRect.x + mLegendRect.width;
          clipRect.width -= (mLegendRect.x + mLegendRect.width);
          clipRect.height = border.top;

          aRenderingContext.PushState();
          aRenderingContext.SetClipRect(clipRect, nsClipCombine_kIntersect);
          nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
                                      aDirtyRect, rect, *borderStyle, mStyleContext, skipSides);
  
          aRenderingContext.PopState();

        
          // draw bottom

          clipRect = rect;
          clipRect.y += border.top;
          clipRect.height = mRect.height - (yoff + border.top);
        
          aRenderingContext.PushState();
          aRenderingContext.SetClipRect(clipRect, nsClipCombine_kIntersect);
          nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
                                      aDirtyRect, rect, *borderStyle, mStyleContext, skipSides);
  
          aRenderingContext.PopState();
        } else {

          nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
                                      aDirtyRect,
                                      nsRect(0,0,mRect.width, mRect.height),
                                      *borderStyle, mStyleContext, skipSides);
        }
    }
  }

  PaintChildren(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);

#ifdef DEBUG
  if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) && GetShowFrameBorders()) {
    if (HasView()) {
      aRenderingContext.SetColor(NS_RGB(0,0,255));
    }
    else {
      aRenderingContext.SetColor(NS_RGB(255,0,0));
    }
    aRenderingContext.DrawRect(0, 0, mRect.width, mRect.height);
  }
#endif
  DO_GLOBAL_REFLOW_COUNT_DSP("nsFieldSetFrame", &aRenderingContext);
  return NS_OK;
}


NS_IMETHODIMP 
nsFieldSetFrame::Reflow(nsIPresContext*          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);

  if (aDesiredSize.mComputeMEW) {
    aDesiredSize.mMaxElementWidth = 0;
  }
  
   //------------ Handle Incremental Reflow -----------------
   PRBool reflowContent = PR_TRUE;
   PRBool reflowLegend = PR_TRUE;
   nsReflowReason reason = aReflowState.reason;

    if ( aReflowState.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: 
                  {
                    nsHTMLReflowState newState(aReflowState);
                    newState.reason = eReflowReason_StyleChange;
                    return Reflow(aPresContext, aDesiredSize, newState, aStatus);
                  }
                  break;

                  // if its a dirty type then reflow us with a dirty reflow
                  case eReflowType_ReflowDirty: 
                  {
                    nsHTMLReflowState newState(aReflowState);
                    newState.reason = eReflowReason_Dirty;
                    return Reflow(aPresContext, aDesiredSize, newState, aStatus);
                  }
                  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 dirty then check dirty flags
    if (reason == eReflowReason_Dirty) 
    {
      if (reflowContent) {
        reflowContent =
          (mContentFrame->GetStateBits()
           & (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) != 0;
      }

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

    // 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;

    // Figure out how big the legend is if there is one. 
    // get the legend's margin
    nsMargin legendMargin(0,0,0,0);
    // reflow the legend only if needed
    if (mLegendFrame) {
        const nsStyleMargin* marginStyle = mLegendFrame->GetStyleMargin();
        marginStyle->GetMargin(legendMargin);

        if (reflowLegend) {
          nsHTMLReflowState legendReflowState(aPresContext, aReflowState,
                                              mLegendFrame, nsSize(NS_INTRINSICSIZE,NS_INTRINSICSIZE),
                                              reason);

          // always give the legend as much size as it needs
          legendReflowState.mComputedWidth = NS_INTRINSICSIZE;
          legendReflowState.mComputedHeight = NS_INTRINSICSIZE;

          nsHTMLReflowMetrics legendDesiredSize(0,0);

          ReflowChild(mLegendFrame, aPresContext, legendDesiredSize, legendReflowState,
                      0, 0, NS_FRAME_NO_MOVE_FRAME, aStatus);
#ifdef NOISY_REFLOW
          printf("  returned (%d, %d)\n", legendDesiredSize.width, legendDesiredSize.height);
          if (legendDesiredSize.mComputeMEW)
            printf("  and maxEW %d\n", 
                   legendDesiredSize.mMaxElementWidth);
#endif
          // figure out the legend's rectangle
          mLegendRect.width  = legendDesiredSize.width + legendMargin.left + legendMargin.right;
          mLegendRect.height = legendDesiredSize.height + legendMargin.top + legendMargin.bottom;
          mLegendRect.x = borderPadding.left;
          mLegendRect.y = 0;

          nscoord oldSpace = mLegendSpace;
          mLegendSpace = 0;
          if (mLegendRect.height > border.top) {
              // center the border on the legend
              mLegendSpace = mLegendRect.height - border.top;
          } else {
              mLegendRect.y = (border.top - mLegendRect.height)/2;
          }

          // if the legend space changes then we need to reflow the 
          // content area as well.
          if (mLegendSpace != oldSpace) {
              if (reflowContent == PR_FALSE || reason == eReflowReason_Dirty) {
                 reflowContent = PR_TRUE;
                 reason = eReflowReason_Resize;
              }
          }

          // if we are contrained then remove the legend from our available height.
          if (NS_INTRINSICSIZE != availSize.height) {
             if (availSize.height >= mLegendSpace)
                 availSize.height -= mLegendSpace;
          }
  
          // don't get any smaller than the legend
          if (NS_INTRINSICSIZE != availSize.width) {
             if (availSize.width < mLegendRect.width)
                 availSize.width = mLegendRect.width;
          }

          FinishReflowChild(mLegendFrame, aPresContext, &legendReflowState, 
                            legendDesiredSize, 0, 0, NS_FRAME_NO_MOVE_FRAME);    

        }
    }

    nsRect contentRect;

    // reflow the content frame only if needed
    if (mContentFrame) {
        if (reflowContent) {
            availSize.width = aReflowState.mComputedWidth;

#if 0
            if (aReflowState.mComputedHeight != NS_INTRINSICSIZE) {
              availSize.height = aReflowState.mComputedHeight - mLegendSpace;
            } else {
              availSize.height = NS_INTRINSICSIZE;
            }
#endif
            nsHTMLReflowState kidReflowState(aPresContext, aReflowState, mContentFrame,
                                             availSize, reason);

            nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.mComputeMEW, aDesiredSize.mFlags);
            // Reflow the frame
            ReflowChild(mContentFrame, aPresContext, kidDesiredSize, kidReflowState,
                        borderPadding.left + kidReflowState.mComputedMargin.left,
                        borderPadding.top + mLegendSpace + kidReflowState.mComputedMargin.top,
                        0, aStatus);
#ifdef NOISY_REFLOW
            printf("  returned (%d, %d)\n", kidDesiredSize.width, kidDesiredSize.height);
            if (kidDesiredSize.mComputeMEW)
              printf("  and maxES %d\n", 
                     kidDesiredSize.mMaxElementWidth);
#endif

            /*
            printf("*** %p computedHgt: %d ", this, aReflowState.mComputedHeight);
              printf("Reason: ");
              switch (aReflowState.reason) {
                case eReflowReason_Initial:printf("Initil");break;
                case eReflowReason_Incremental:printf("Increm");break;
                case eReflowReason_Resize: printf("Resize");      break;
                case eReflowReason_StyleChange:printf("eReflowReason_StyleChange");break;
              }
              */

            // set the rect. make sure we add the margin back in.
            contentRect.SetRect(borderPadding.left,borderPadding.top + mLegendSpace,kidDesiredSize.width ,kidDesiredSize.height);
            if (aReflowState.mComputedHeight != NS_INTRINSICSIZE &&
                borderPadding.top + mLegendSpace+kidDesiredSize.height > aReflowState.mComputedHeight) {
              kidDesiredSize.height = aReflowState.mComputedHeight-(borderPadding.top + mLegendSpace);
            }

            FinishReflowChild(mContentFrame, aPresContext, &kidReflowState, 
                              kidDesiredSize, contentRect.x, contentRect.y, 0);
            if (aDesiredSize.mComputeMEW) {
              aDesiredSize.mMaxElementWidth = kidDesiredSize.mMaxElementWidth;
            }

           // printf("width: %d, height: %d\n", desiredSize.mCombinedArea.width, desiredSize.mCombinedArea.height);

            /*
            if (mContentFrame->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
                 mState |= NS_FRAME_OUTSIDE_CHILDREN;
                 aDesiredSize.mOverflowArea.width += borderPadding.left + borderPadding.right;
                 aDesiredSize.mOverflowArea.height += borderPadding.top + borderPadding.bottom + mLegendSpace;
            }
            */

            NS_FRAME_TRACE_REFLOW_OUT("FieldSet::Reflow", aStatus);

        } else {
            // if we don't need to reflow just get the old size
            contentRect = mContentFrame->GetRect();
            const nsStyleMargin* marginStyle = mContentFrame->GetStyleMargin();

            nsMargin m(0,0,0,0);
            marginStyle->GetMargin(m);
            contentRect.Inflate(m);
        }
    }

    // use the computed width if the inner content does not fill it
    if (aReflowState.mComputedWidth != NS_INTRINSICSIZE &&
        aReflowState.mComputedWidth > contentRect.width) {
      contentRect.width = aReflowState.mComputedWidth;
    }

    if (mLegendFrame) {
      // if the content rect is larger then the  legend we can align the legend
      if (contentRect.width > mLegendRect.width) {
        PRInt32 align = ((nsLegendFrame*)mLegendFrame)->GetAlign();

        switch(align) {
          case NS_STYLE_TEXT_ALIGN_RIGHT:
            mLegendRect.x = contentRect.width - mLegendRect.width + borderPadding.left;
            break;
          case NS_STYLE_TEXT_ALIGN_CENTER:
            float p2t;
            p2t = aPresContext->PixelsToTwips();
            mLegendRect.x = NSIntPixelsToTwips((nscoord) NSToIntRound((float)(contentRect.width/2 - mLegendRect.width/2 + borderPadding.left) / p2t),p2t);
        }
  
      } else {
        //otherwise make place for the legend
        contentRect.width = mLegendRect.width;
      }
      // place the legend
      nsRect actualLegendRect(mLegendRect);
      actualLegendRect.Deflate(legendMargin);

      nsPoint curOrigin = mLegendFrame->GetPosition();

      // only if the origin changed
      if ((curOrigin.x != mLegendRect.x) || (curOrigin.y != mLegendRect.y)) {
          mLegendFrame->SetPosition(nsPoint(actualLegendRect.x , actualLegendRect.y));
          nsContainerFrame::PositionFrameView(aPresContext, mLegendFrame);

          // We need to recursively process the legend frame's
          // children since we're moving the frame after Reflow.
          nsContainerFrame::PositionChildViews(aPresContext, mLegendFrame);
      }
    }

    // Return our size and our result
    if (aReflowState.mComputedHeight == NS_INTRINSICSIZE) {
       aDesiredSize.height = mLegendSpace + 
                             borderPadding.top +
                             contentRect.height +
                             borderPadding.bottom;
    } else {
       nscoord min = borderPadding.top + borderPadding.bottom + mLegendRect.height;
       aDesiredSize.height = aReflowState.mComputedHeight + borderPadding.top + borderPadding.bottom;
       if (aDesiredSize.height < min)
           aDesiredSize.height = min;
    }
    aDesiredSize.width = contentRect.width + borderPadding.left + borderPadding.right;
    aDesiredSize.ascent  = aDesiredSize.height;
    aDesiredSize.descent = 0;
    aDesiredSize.mMaximumWidth = aDesiredSize.width;
    if (aDesiredSize.mComputeMEW) {
        // if the legend is wider use it
        if (aDesiredSize.mMaxElementWidth < mLegendRect.width)
            aDesiredSize.mMaxElementWidth = mLegendRect.width;

        // add in padding.
        aDesiredSize.mMaxElementWidth += borderPadding.left + borderPadding.right;
    }
    aDesiredSize.mOverflowArea = nsRect(0, 0, aDesiredSize.width, aDesiredSize.height);
    if (mLegendFrame)
      ConsiderChildOverflow(aPresContext, aDesiredSize.mOverflowArea, mLegendFrame);
    if (mContentFrame)
      ConsiderChildOverflow(aPresContext, aDesiredSize.mOverflowArea, mContentFrame);
    StoreOverflow(aPresContext, aDesiredSize);
#ifdef NOISY_REFLOW
    printf("FIELDSET:  w=%d, maxWidth=%d, MEW=%d\n",
           aDesiredSize.width, aDesiredSize.mMaximumWidth, 
           aDesiredSize.mComputeMEW ? aDesiredSize.mMaxElementWidth : -1);
    if (aDesiredSize.mFlags & NS_REFLOW_CALC_MAX_WIDTH)
      printf("  and preferred size = %d\n", aDesiredSize.mMaximumWidth);

#endif
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return NS_OK;
}

PRIntn
nsFieldSetFrame::GetSkipSides() const
{
  return 0;
}

NS_IMETHODIMP
nsFieldSetFrame::AppendFrames(nsIPresContext* aPresContext,
                      nsIPresShell&   aPresShell,
                      nsIAtom*        aListName,
                      nsIFrame*       aFrameList)
{
  return mContentFrame->AppendFrames(aPresContext,
                                     aPresShell,
                                     aListName,
                                     aFrameList);
}

NS_IMETHODIMP
nsFieldSetFrame::InsertFrames(nsIPresContext* aPresContext,
                      nsIPresShell&   aPresShell,
                      nsIAtom*        aListName,
                      nsIFrame*       aPrevFrame,
                      nsIFrame*       aFrameList)
{
  return mContentFrame->InsertFrames(aPresContext,
                                     aPresShell,
                                     aListName,
                                     aPrevFrame,
                                     aFrameList);
}

NS_IMETHODIMP
nsFieldSetFrame::RemoveFrame(nsIPresContext* aPresContext,
                     nsIPresShell&   aPresShell,
                     nsIAtom*        aListName,
                     nsIFrame*       aOldFrame)
{
  // XXX XXX
  // XXX temporary fix for bug 70648
  if (aOldFrame == mLegendFrame) {   
    nsIFrame* sibling = mContentFrame->GetNextSibling();
    NS_ASSERTION(sibling == mLegendFrame, "legendFrame is not next sibling");
    NS_ASSERTION(mLegendFrame->GetParent() == this, "Legend Parent has wrong parent");
    nsIFrame* legendSibling = sibling->GetNextSibling();
    // replace the legend, which is the next sibling, with any siblings of the legend (XXX always null?)
    mContentFrame->SetNextSibling(legendSibling);
    // OK, the legend is now removed from the sibling list, but who has ownership of it?
    mLegendFrame->Destroy(aPresContext);
    mLegendFrame = nsnull;
    return NS_OK;
  } else {
    return mContentFrame->RemoveFrame (aPresContext,
                                       aPresShell,
                                       aListName,
                                       aOldFrame);
  }
}


NS_IMETHODIMP
nsFieldSetFrame::ReplaceFrame(nsIPresContext* aPresContext,
                     nsIPresShell&   aPresShell,
                     nsIAtom*        aListName,
                     nsIFrame*       aOldFrame,
                     nsIFrame*       aNewFrame)
{
  return mContentFrame->ReplaceFrame (aPresContext,
                                     aPresShell,
                                     aListName,
                                     aOldFrame,
                                     aNewFrame);
}

NS_IMETHODIMP
nsFieldSetFrame::GetFrameForPoint(nsIPresContext*   aPresContext,
                     const nsPoint&    aPoint, 
                     nsFramePaintLayer aWhichLayer,
                     nsIFrame**        aFrame)
{
  // this should act like a block, so we need to override
  return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_BACKGROUND), aFrame);
}

#ifdef ACCESSIBILITY
NS_IMETHODIMP nsFieldSetFrame::GetAccessible(nsIAccessible** aAccessible)
{
  nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");

  if (accService) {
    return accService->CreateHTMLGroupboxAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
  }

  return NS_ERROR_FAILURE;
}
#endif