layout/forms/nsSelectsAreaFrame.h

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