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#ifndef nsITableLayout_h__
#define nsITableLayout_h__

#include "nsISupports.h"
class nsIDOMElement;

// IID for the nsITableLayout interface 
// A9222E6B-437E-11d3-B227-004095E27A10
#define NS_ITABLELAYOUT_IID \
 { 0xa9222e6b, 0x437e, 0x11d3, { 0xb2, 0x27, 0x0, 0x40, 0x95, 0xe2, 0x7a, 0x10 }}


#define NS_TABLELAYOUT_CELL_NOT_FOUND \
  NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_LAYOUT, 3)


/**
 * nsITableLayout
 * interface for layout objects that act like tables.
 * initially, we use this to get cell info 
 *
 * @author  sclark
 */
class nsITableLayout : public nsISupports
{
public:

  static const nsIID& GetIID() { static nsIID iid = NS_ITABLELAYOUT_IID; return iid; }

  /** return all the relevant layout information about a cell.
   *  @param aRowIndex       a row which the cell intersects
   *  @param aColIndex       a col which the cell intersects
   *  @param aCell           [OUT] the content representing the cell at (aRowIndex, aColIndex)
   *  @param aStartRowIndex  [IN/OUT] the row in which aCell starts
   *  @param aStartColIndex  [IN/OUT] the col in which aCell starts
   *                         Initialize these with the "candidate" start indexes to use
   *                           for searching through the table when a cell isn't found 
   *                           because of "holes" in the cellmap
   *                           when ROWSPAN and/or COLSPAN > 1
   *  @param aRowSpan        [OUT] the value of the ROWSPAN attribute (may be 0 or actual number)
   *  @param aColSpan        [OUT] the value of the COLSPAN attribute (may be 0 or actual number)
   *  @param aActualRowSpan  [OUT] the actual number of rows aCell spans
   *  @param aActualColSpan  [OUT] the acutal number of cols aCell spans
   *  @param aIsSelected     [OUT] PR_TRUE if the frame that maps aCell is selected
   *                               in the presentation shell that owns this.
   */
  NS_IMETHOD GetCellDataAt(PRInt32 aRowIndex, PRInt32 aColIndex,
                           nsIDOMElement* &aCell,   //out params
                           PRInt32& aStartRowIndex, PRInt32& aStartColIndex, 
                           PRInt32& aRowSpan, PRInt32& aColSpan,
                           PRInt32& aActualRowSpan, PRInt32& aActualColSpan,
                           PRBool& aIsSelected)=0;

  /** Get the number of rows and column for a table from the frame's cellmap 
   *  Some rows may not have enough cells (the number returned is the maximum possible),
   *  which displays as a ragged-right edge table
   */
  NS_IMETHOD GetTableSize(PRInt32& aRowCount, PRInt32& aColCount)=0;
};

#endif