pjs/layout/tables/FixedTableLayoutStrategy.h

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#ifndef FixedTableLayoutStrategy_h__
#define FixedTableLayoutStrategy_h__

#include "nscore.h"
#include "BasicTableLayoutStrategy.h"
#include "nsCoord.h"

class nsVoidArray;
class nsTableFrame;
struct nsStylePosition;


/* ---------- FixedTableLayoutStrategy ---------- */

/** Implementation of HTML4 "table-layout=fixed" table layout.
  * The input to this class is the resolved styles for both the
  * table columns and the cells in row0.
  * The output from this class is to set the column widths in
  * mTableFrame.
  */
class FixedTableLayoutStrategy : public BasicTableLayoutStrategy
{
public:

  /** Public constructor.
    * @param aFrame           the table frame for which this delegate will do layout   
    */
  FixedTableLayoutStrategy(nsTableFrame *aFrame);

  /** destructor */
  virtual ~FixedTableLayoutStrategy();

  /** Called during resize reflow to determine the new column widths
   * @param aReflowState - the reflow state for mTableFrame
   */
  virtual PRBool  BalanceColumnWidths(const nsHTMLReflowState& aReflowState);
  
  /**
    * 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
    * @return               - the basis for percent calculations
    */
  virtual nscoord CalcPctAdjTableWidth(const nsHTMLReflowState& aReflowState,
                                       nscoord                  aAvailWidth) {return 0;};

protected:
   /* assign the width of all columns
    * if there is a colframe with a width attribute, use it as the column width.
    * otherwise if there is a cell in the first row and it has a width attribute, use it.
    *  if this cell includes a colspan, width is divided equally among spanned columns
    * otherwise the cell get a proportion of the remaining space. 
    *  as determined by the table width attribute.  If no table width attribute, it gets 0 width
    * Computes the minimum and maximum table widths.
    *
    * Set column width information in each column frame and in the table frame.
    *
    * @return PR_TRUE if all is well, PR_FALSE if there was an unrecoverable error
    *
    */
  virtual PRBool AssignNonPctColumnWidths(nscoord                  aComputedWidth,
                                          const nsHTMLReflowState& aReflowState);


};


#endif