gecko/layout/xul/base/src/grid/nsGridRowLeafFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 Communicator client 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.
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 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//

#include "nsGridRowLeafFrame.h"
#include "nsGridRowLeafLayout.h"
#include "nsGridRow.h"
#include "nsBoxLayoutState.h"
#include "nsGridLayout2.h"

already_AddRefed<nsBoxLayout> NS_NewGridRowLeafLayout();

nsIFrame*
NS_NewGridRowLeafFrame(nsIPresShell* aPresShell,
                       nsStyleContext* aContext)
{
  nsCOMPtr<nsBoxLayout> layout = NS_NewGridRowLeafLayout();
  if (!layout) {
    return nsnull;
  }
  
  return new (aPresShell) nsGridRowLeafFrame(aPresShell, aContext, PR_FALSE,
                                             layout);
}

NS_IMPL_FRAMEARENA_HELPERS(nsGridRowLeafFrame)

/*
 * Our border and padding could be affected by our columns or rows.
 * Let's go check it out.
 */
NS_IMETHODIMP
nsGridRowLeafFrame::GetBorderAndPadding(nsMargin& aBorderAndPadding)
{
  // if our columns have made our padding larger add it in.
  nsresult rv = nsBoxFrame::GetBorderAndPadding(aBorderAndPadding);

  nsIGridPart* part = nsGrid::GetPartFromBox(this);
  if (!part)
    return rv;
    
  PRInt32 index = 0;
  nsGrid* grid = part->GetGrid(this, &index);

  if (!grid) 
    return rv;

  PRBool isHorizontal = IsHorizontal();

  nsBoxLayoutState state(PresContext());

  PRInt32 firstIndex = 0;
  PRInt32 lastIndex = 0;
  nsGridRow* firstRow = nsnull;
  nsGridRow* lastRow = nsnull;
  grid->GetFirstAndLastRow(state, firstIndex, lastIndex, firstRow, lastRow, isHorizontal);

  // only the first and last rows can be affected.
  if (firstRow && firstRow->GetBox() == this) {
    
    nscoord top = 0;
    nscoord bottom = 0;
    grid->GetRowOffsets(state, firstIndex, top, bottom, isHorizontal);

    if (isHorizontal) {
      if (top > aBorderAndPadding.top)
        aBorderAndPadding.top = top;
    } else {
      if (top > aBorderAndPadding.left)
        aBorderAndPadding.left = top;
    } 
  }

  if (lastRow && lastRow->GetBox() == this) {
    
    nscoord top = 0;
    nscoord bottom = 0;
    grid->GetRowOffsets(state, lastIndex, top, bottom, isHorizontal);

    if (isHorizontal) {
      if (bottom > aBorderAndPadding.bottom)
        aBorderAndPadding.bottom = bottom;
    } else {
      if (bottom > aBorderAndPadding.right)
        aBorderAndPadding.right = bottom;
    }
    
  }  
  
  return rv;
}