/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//

// 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<nsBoxLayout> NS_NewGridRowGroupLayout();

nsIFrame*

NS_NewGridRowGroupFrame(nsIPresShell* aPresShell,

                        ComputedStyle* aStyle)

{

  nsCOMPtr<nsBoxLayout> layout = NS_NewGridRowGroupLayout();

  return new (aPresShell) nsGridRowGroupFrame(aStyle, layout);

}

NS_IMPL_FRAMEARENA_HELPERS(nsGridRowGroupFrame)

/**

 * 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::GetXULFlex()

{

  // 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::GetXULFlex() == 0)

    return 0;

  // ok we are flexible add up our children

  nscoord totalFlex = 0;

  nsIFrame* child = nsBox::GetChildXULBox(this);

  while (child)

  {

    totalFlex += child->GetXULFlex();

    child = GetNextXULBox(child);

  }

  mFlex = totalFlex;

  return totalFlex;

}