/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * 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
 * Netscape Communications Corporation.
 * 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"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//

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

already_AddRefed<nsIBoxLayout> NS_NewGridRowGroupLayout();

nsIFrame*
NS_NewGridRowGroupFrame(nsIPresShell* aPresShell,
                        nsStyleContext* aContext)
{
  nsCOMPtr<nsIBoxLayout> layout = NS_NewGridRowGroupLayout();
  if (!layout) {
    return nsnull;
  }

  return new (aPresShell) nsGridRowGroupFrame(aPresShell, aContext, layout);
} 


/**
 * This is redefined because row groups have a funny property. If they are flexible
 * then their flex must be equal to the sum of their children's flexes.
 */
nscoord
nsGridRowGroupFrame::GetFlex(nsBoxLayoutState& aState)
{
  // if we are flexible out flexibility is determined by our columns.
  // so first get the our flex. If not 0 then our flex is the sum of
  // our columns flexes.

  if (!DoesNeedRecalc(mFlex))
     return mFlex;

  if (nsBoxFrame::GetFlex(aState) == 0)
    return 0;

  // ok we are flexible add up our children
  nscoord totalFlex = 0;
  nsIBox* child = GetChildBox();
  while (child)
  {
    totalFlex += child->GetFlex(aState);
    child = child->GetNextBox();
  }

  mFlex = totalFlex;

  return totalFlex;
}