pjs/layout/forms/nsSelectsAreaFrame.h

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#ifndef nsSelectsAreaFrame_h___
#define nsSelectsAreaFrame_h___

#include "nsAreaFrame.h"
class nsIContent;

/**
 * The area frame has an additional named child list:
 * - "Absolute-list" which contains the absolutely positioned frames
 *
 * @see nsGkAtoms::absoluteList
 */
class nsSelectsAreaFrame : public nsAreaFrame
{
public:
  friend nsIFrame* NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRUint32 aFlags);

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  nsresult BuildDisplayListInternal(nsDisplayListBuilder*   aBuilder,
                                    const nsRect&           aDirtyRect,
                                    const nsDisplayListSet& aLists);

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

  static PRBool IsOptionElement(nsIContent* aContent);
  static PRBool IsOptionElementFrame(nsIFrame *aFrame);
  
  nscoord HeightOfARow() const { return mHeightOfARow; }
  
protected:
  nsSelectsAreaFrame(nsStyleContext* aContext) :
    nsAreaFrame(aContext),
    mHeightOfARow(0)
  {}

  // We cache the height of a single row so that changes to the "size"
  // attribute, padding, etc. can all be handled with only one reflow.  We'll
  // have to reflow twice if someone changes our font size or something like
  // that, so that the heights of our options will change.
  nscoord mHeightOfARow;
};

#endif /* nsSelectsAreaFrame_h___ */