/* -*- 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):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/**
 
  Author:
  Eric D Vaughan

**/

#ifndef nsGridRowLayout_h___
#define nsGridRowLayout_h___

#include "nsSprocketLayout.h"
#include "nsIGridPart.h"
class nsGridRowGroupLayout;
class nsGridLayout2;
class nsBoxLayoutState;
class nsGrid;

/**
 * A common base class for nsGridRowLeafLayout (the nsBoxLayout object
 * for a grid row or column) and nsGridRowGroupLayout (the nsBoxLayout
 * object for a grid row group or column group).
 */
// XXXldb This needs a name that indicates that it's a base class for
// both row and rows (row-group).
class nsGridRowLayout : public nsSprocketLayout,
                        public nsIGridPart
{
public:
  NS_DECL_ISUPPORTS_INHERITED

  virtual nsGridRowGroupLayout* CastToRowGroupLayout() { return nsnull; }
  virtual nsGridLayout2* CastToGridLayout() { return nsnull; }
  virtual nsGrid* GetGrid(nsIBox* aBox, PRInt32* aIndex, nsGridRowLayout* aRequestor=nsnull);
  virtual nsIGridPart* GetParentGridPart(nsIBox* aBox, nsIBox** aParentBox);
  virtual void ChildrenInserted(nsIBox* aBox, nsBoxLayoutState& aState,
                                nsIBox* aPrevBox,
                                const nsFrameList::Slice& aNewChildren);
  virtual void ChildrenAppended(nsIBox* aBox, nsBoxLayoutState& aState,
                                const nsFrameList::Slice& aNewChildren);
  virtual void ChildrenRemoved(nsIBox* aBox, nsBoxLayoutState& aState, nsIBox* aChildList);
  virtual void ChildrenSet(nsIBox* aBox, nsBoxLayoutState& aState, nsIBox* aChildList);
  virtual nsMargin GetTotalMargin(nsIBox* aBox, bool aIsHorizontal);

  virtual nsIGridPart* AsGridPart() { return this; }

protected:
  virtual void ChildAddedOrRemoved(nsIBox* aBox, nsBoxLayoutState& aState)=0;

  nsGridRowLayout();
};

#endif

