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 An optional interface for embedding clients wishing to receive
 notifications for when a tooltip should be displayed or removed.
 The embedder implements this interface on the web browser chrome
 object associated with the window that notifications are required
 for.

 @see nsITooltipTextProvider

 @status FROZEN
[scriptable, uuid(44b78386-1dd2-11b2-9ad2-e4eee2ca1916)]
interface nsITooltipListener : nsISupports

Methods

 Called when the tooltip should be hidden, either because the pointer
 has moved or the tooltip has timed out.
void onHideTooltip() 
 Called when a tooltip should be displayed.

 @param aXCoords The tooltip left edge X coordinate.
 @param aYCoords The tooltip top edge Y coordinate.
 @param aTipText The text to display in the tooltip, typically obtained
        from the TITLE attribute of the node (or containing parent)
        over which the pointer has been positioned.

 @note
 Coordinates are specified in pixels, relative to the top-left
 corner of the browser area.

 @return <code>NS_OK</code> if the tooltip was displayed.
void onShowTooltip(in long aXCoords, in long aYCoords, in wstring aTipText)