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37 :
38 : #ifndef nsIPercentHeightObserver_h___
39 : #define nsIPercentHeightObserver_h___
40 :
41 : #include "nsQueryFrame.h"
42 :
43 : struct nsHTMLReflowState;
44 :
45 : /**
46 : * This interface is supported by frames that need to provide computed height
47 : * values to children during reflow which would otherwise not happen. Currently only
48 : * table cells support this.
49 : */
50 : class nsIPercentHeightObserver
51 0 : {
52 : public:
53 : NS_DECL_QUERYFRAME_TARGET(nsIPercentHeightObserver)
54 :
55 : // Notify the observer that aReflowState has no computed height, but it has a percent height
56 : virtual void NotifyPercentHeight(const nsHTMLReflowState& aReflowState) = 0;
57 :
58 : // Ask the observer if it should observe aReflowState.frame
59 : virtual bool NeedsToObserve(const nsHTMLReflowState& aReflowState) = 0;
60 : };
61 :
62 : #endif // nsIPercentHeightObserver_h___
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