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#ifndef nsITableLayoutStrategy_h__
#define nsITableLayoutStrategy_h__

#include "nscore.h"
#include "nsSize.h"

class nsIPresContext;
struct nsHTMLReflowState;
struct nsMargin;
class nsTableCellFrame;
class nsStyleCoord;

class nsITableLayoutStrategy
{
public:
  virtual ~nsITableLayoutStrategy() {};

  /** call once every time any table thing changes (content, structure, or style) 
    * @param aPresContext - the presentation context
	   * @param aReflowState - the reflow state for mTableFrame
    */
  virtual PRBool Initialize(nsIPresContext*          aPresContext,
                            const nsHTMLReflowState& aReflowState)=0;

  /** assign widths for each column, taking into account the table content, the effective style, 
    * the layout constraints, and the compatibility mode.  Sets mColumnWidths as a side effect.
    * @param aPresContext - the presentation context
	   * @param aReflowState - the reflow state for mTableFrame
    */
  virtual PRBool BalanceColumnWidths(nsIPresContext*          aPresContext,
                                     const nsHTMLReflowState& aReflowState)=0;

  /**
    * Calculate the basis for percent width calculations of the table elements
    * @param aReflowState   - the reflow state of the table
    * @param aAvailWidth    - the available width for the table
    * @param aPixelToTwips  - the number of twips in a pixel.
    * @return               - the basis for percent calculations
    */
  virtual nscoord CalcPctAdjTableWidth(nsIPresContext&          aPresContext,
                                       const nsHTMLReflowState& aReflowState,
                                       nscoord                  aAvailWidth,
                                       float                    aPixelToTwips)=0;
};

#endif

