layout/forms/nsSelectsAreaFrame.h

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  37 #ifndef nsSelectsAreaFrame_h___
  38 #define nsSelectsAreaFrame_h___
  39
  40 #include "nsAreaFrame.h"
  41 class nsIContent;
  42
  43 /**
  44  * The area frame has an additional named child list:
  45  * - "Absolute-list" which contains the absolutely positioned frames
  46  *
  47  * @see nsGkAtoms::absoluteList
  48  */
  49 class nsSelectsAreaFrame : public nsAreaFrame
  50 {
  51 public:
  52   friend nsIFrame* NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRUint32 aFlags);
  53
  54   NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  55                               const nsRect&           aDirtyRect,
  56                               const nsDisplayListSet& aLists);
  57
  58   nsresult BuildDisplayListInternal(nsDisplayListBuilder*   aBuilder,
  59                                     const nsRect&           aDirtyRect,
  60                                     const nsDisplayListSet& aLists);
  61
  62   NS_IMETHOD Reflow(nsPresContext*          aCX,
  63                     nsHTMLReflowMetrics&     aDesiredSize,
  64                     const nsHTMLReflowState& aReflowState,
  65                     nsReflowStatus&          aStatus);
  66
  67   static PRBool IsOptionElement(nsIContent* aContent);
  68   static PRBool IsOptionElementFrame(nsIFrame *aFrame);
  69
  70   nscoord HeightOfARow() const { return mHeightOfARow; }
  71
  72 protected:
  73   nsSelectsAreaFrame(nsStyleContext* aContext) :
  74     nsAreaFrame(aContext),
  75     mHeightOfARow(0)
  76   {}
  77
  78   // We cache the height of a single row so that changes to the "size"
  79   // attribute, padding, etc. can all be handled with only one reflow.  We'll
  80   // have to reflow twice if someone changes our font size or something like
  81   // that, so that the heights of our options will change.
  82   nscoord mHeightOfARow;
  83 };
  84
  85 #endif /* nsSelectsAreaFrame_h___ */