gecko/layout/tables/nsTableCellFrame.h

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#ifndef nsTableCellFrame_h__
#define nsTableCellFrame_h__

#include "nsITableCellLayout.h"
#include "nscore.h"
#include "nsHTMLContainerFrame.h"
#include "nsTableRowFrame.h"  // need to actually include this here to inline GetRowIndex
#include "nsStyleContext.h"
#include "nsIPercentHeightObserver.h"
#include "nsGkAtoms.h"
#include "nsLayoutUtils.h"

class nsTableFrame;

/**
 * Additional frame-state bits
 */
#define NS_TABLE_CELL_CONTENT_EMPTY       0x80000000
#define NS_TABLE_CELL_HAD_SPECIAL_REFLOW  0x20000000
#define NS_TABLE_CELL_HAS_PCT_OVER_HEIGHT 0x10000000

/**
 * nsTableCellFrame
 * data structure to maintain information about a single table cell's frame
 *
 * NOTE:  frames are not ref counted.  We expose addref and release here
 * so we can change that decsion in the future.  Users of nsITableCellLayout
 * should refcount correctly as if this object is being ref counted, though
 * no actual support is under the hood.
 *
 * @author  sclark
 */
class nsTableCellFrame : public nsHTMLContainerFrame, 
                         public nsITableCellLayout, 
                         public nsIPercentHeightObserver
{
public:

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // default constructor supplied by the compiler

  nsTableCellFrame(nsStyleContext* aContext);
  ~nsTableCellFrame();

  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        aPrevInFlow);

#ifdef ACCESSIBILITY
  NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#endif

  NS_IMETHOD  AttributeChanged(PRInt32         aNameSpaceID,
                               nsIAtom*        aAttribute,
                               PRInt32         aModType);

  // table cells contain an area frame which does most of the work, and
  // so these functions should never be called. They assert and return
  // NS_ERROR_NOT_IMPLEMENTED
  NS_IMETHOD AppendFrames(nsIAtom*        aListName,
                          nsIFrame*       aFrameList);
  NS_IMETHOD InsertFrames(nsIAtom*        aListName,
                          nsIFrame*       aPrevFrame,
                          nsIFrame*       aFrameList);
  NS_IMETHOD RemoveFrame(nsIAtom*        aListName,
                         nsIFrame*       aOldFrame);

  virtual nsIFrame* GetContentInsertionFrame() {
    return GetFirstChild(nsnull)->GetContentInsertionFrame();
  }

  virtual nsMargin GetUsedMargin() const;

  virtual void NotifyPercentHeight(const nsHTMLReflowState& aReflowState);

  virtual PRBool NeedsToObserve(const nsHTMLReflowState& aReflowState);

  /** instantiate a new instance of nsTableRowFrame.
    * @param aPresShell the pres shell for this frame
    *
    * @return           the frame that was created
    */
  friend nsIFrame* NS_NewTableCellFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);
                              
  void PaintCellBackground(nsIRenderingContext& aRenderingContext,
                           const nsRect& aDirtyRect, nsPoint aPt);

  NS_IMETHOD SetSelected(nsPresContext* aPresContext,
                         nsIDOMRange *aRange,
                         PRBool aSelected,
                         nsSpread aSpread,
                         SelectionType aType);

  virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
  virtual IntrinsicWidthOffsetData
    IntrinsicWidthOffsets(nsIRenderingContext* aRenderingContext);

  NS_IMETHOD Reflow(nsPresContext*      aPresContext,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&      aStatus);

  /**
   * Get the "type" of the frame
   *
   * @see nsLayoutAtoms::tableCellFrame
   */
  virtual nsIAtom* GetType() const;

  virtual PRBool IsContainingBlock() const;

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif

  void VerticallyAlignChild(nscoord aMaxAscent);

  PRBool HasVerticalAlignBaseline();
  
  PRBool CellHasVisibleContent(nscoord       height, 
                               nsTableFrame* tableFrame,
                               nsIFrame*     kidFrame);

  /**
   * Get the first-line baseline of the cell relative to its top border
   * edge, as if the cell were vertically aligned to the top of the row.
   */
  nscoord GetCellBaseline() const;

  /**
   * return the cell's specified row span. this is what was specified in the
   * content model or in the style info, and is always >= 1.
   * to get the effective row span (the actual value that applies), use GetEffectiveRowSpan()
   * @see nsTableFrame::GetEffectiveRowSpan()
   */
  virtual PRInt32 GetRowSpan();

  // there is no set row index because row index depends on the cell's parent row only

  /*---------------- nsITableCellLayout methods ------------------------*/

  /**
   * return the cell's starting row index (starting at 0 for the first row).
   * for continued cell frames the row index is that of the cell's first-in-flow
   * and the column index (starting at 0 for the first column
   */
  NS_IMETHOD GetCellIndexes(PRInt32 &aRowIndex, PRInt32 &aColIndex);

  /** return the mapped cell's row index (starting at 0 for the first row) */
  virtual nsresult GetRowIndex(PRInt32 &aRowIndex) const;

  /**
   * return the cell's specified col span. this is what was specified in the
   * content model or in the style info, and is always >= 1.
   * to get the effective col span (the actual value that applies), use GetEffectiveColSpan()
   * @see nsTableFrame::GetEffectiveColSpan()
   */
  virtual PRInt32 GetColSpan();
  
  /** return the cell's column index (starting at 0 for the first column) */
  virtual nsresult GetColIndex(PRInt32 &aColIndex) const;
  void SetColIndex(PRInt32 aColIndex);

  /** return the available width given to this frame during its last reflow */
  inline nscoord GetPriorAvailWidth();
  
  /** set the available width given to this frame during its last reflow */
  inline void SetPriorAvailWidth(nscoord aPriorAvailWidth);

  /** return the desired size returned by this frame during its last reflow */
  inline nsSize GetDesiredSize();

  /** set the desired size returned by this frame during its last reflow */
  inline void SetDesiredSize(const nsHTMLReflowMetrics & aDesiredSize);

  PRBool GetContentEmpty();
  void SetContentEmpty(PRBool aContentEmpty);

  PRBool HasPctOverHeight();
  void SetHasPctOverHeight(PRBool aValue);

  nsTableCellFrame* GetNextCell() const;

  virtual nsMargin* GetBorderWidth(nsMargin& aBorder) const;

  virtual void PaintBackground(nsIRenderingContext& aRenderingContext,
                               const nsRect&        aDirtyRect,
                               nsPoint              aPt);

  void DecorateForSelection(nsIRenderingContext& aRenderingContext,
                            nsPoint              aPt);
                                 
protected:
  /** implement abstract method on nsHTMLContainerFrame */
  virtual PRIntn GetSkipSides() const;

  virtual PRBool ParentDisablesSelection() const; //override default behavior

  /**
   * GetSelfOverflow says what effect the cell should have on its own
   * overflow area.  In the separated borders model this should just be
   * the frame's size (as it is for most frames), but in the collapsed
   * borders model (for which nsBCTableCellFrame overrides this virtual
   * method), it considers the extents of the collapsed border so we
   * handle invalidation correctly for dynamic border changes.
   */
  virtual void GetSelfOverflow(nsRect& aOverflowArea);

private:  

  // All these methods are support methods for RecalcLayoutData
  nsIFrame* GetFrameAt(nsVoidArray* aList,  PRInt32 aIndex);

protected:

  friend class nsTableRowFrame;

  PRUint32     mColIndex;             // the starting column for this cell 

  nscoord      mPriorAvailWidth;      // the avail width during the last reflow
  nsSize       mDesiredSize;          // the last desired width & height
};

inline nscoord nsTableCellFrame::GetPriorAvailWidth()
{ return mPriorAvailWidth;}

inline void nsTableCellFrame::SetPriorAvailWidth(nscoord aPriorAvailWidth)
{ mPriorAvailWidth = aPriorAvailWidth;}

inline nsSize nsTableCellFrame::GetDesiredSize()
{ return mDesiredSize; }

inline void nsTableCellFrame::SetDesiredSize(const nsHTMLReflowMetrics & aDesiredSize)
{ 
  mDesiredSize.width = aDesiredSize.width;
  mDesiredSize.height = aDesiredSize.height;
}

inline PRBool nsTableCellFrame::GetContentEmpty()
{
  return (mState & NS_TABLE_CELL_CONTENT_EMPTY) ==
         NS_TABLE_CELL_CONTENT_EMPTY;
}

inline void nsTableCellFrame::SetContentEmpty(PRBool aContentEmpty)
{
  if (aContentEmpty) {
    mState |= NS_TABLE_CELL_CONTENT_EMPTY;
  } else {
    mState &= ~NS_TABLE_CELL_CONTENT_EMPTY;
  }
}

inline PRBool nsTableCellFrame::HasPctOverHeight()
{
  return (mState & NS_TABLE_CELL_HAS_PCT_OVER_HEIGHT) ==
         NS_TABLE_CELL_HAS_PCT_OVER_HEIGHT;
}

inline void nsTableCellFrame::SetHasPctOverHeight(PRBool aValue)
{
  if (aValue) {
    mState |= NS_TABLE_CELL_HAS_PCT_OVER_HEIGHT;
  } else {
    mState &= ~NS_TABLE_CELL_HAS_PCT_OVER_HEIGHT;
  }
}

// nsBCTableCellFrame
class nsBCTableCellFrame : public nsTableCellFrame
{
public:

  nsBCTableCellFrame(nsStyleContext* aContext);

  ~nsBCTableCellFrame();

  virtual nsIAtom* GetType() const;

  virtual nsMargin GetUsedBorder() const;

  // Get the *inner half of the border only*, in twips.
  virtual nsMargin* GetBorderWidth(nsMargin& aBorder) const;

  // Get the *inner half of the border only*, in pixels.
  BCPixelSize GetBorderWidth(PRUint8 aSide) const;

  // Set the full (both halves) width of the border
  void SetBorderWidth(PRUint8 aSide, BCPixelSize aPixelValue);

  virtual void GetSelfOverflow(nsRect& aOverflowArea);

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif

  virtual void PaintBackground(nsIRenderingContext& aRenderingContext,
                               const nsRect&        aDirtyRect,
                               nsPoint              aPt);

private:
  
  // These are the entire width of the border (the cell edge contains only
  // the inner half, per the macros in nsTablePainter.h).
  BCPixelSize mTopBorder;
  BCPixelSize mRightBorder;
  BCPixelSize mBottomBorder;
  BCPixelSize mLeftBorder;
};

#endif