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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef nsIPercentBSizeObserver_h___
       7             : #define nsIPercentBSizeObserver_h___
       8             : 
       9             : #include "nsQueryFrame.h"
      10             : 
      11             : namespace mozilla {
      12             : struct ReflowInput;
      13             : } // namespace mozilla
      14             : 
      15             : /**
      16             :  * This interface is supported by frames that need to provide computed bsize
      17             :  * values to children during reflow which would otherwise not happen. Currently
      18             :  * only table cells support this.
      19             :  */
      20           0 : class nsIPercentBSizeObserver
      21             : {
      22             : public:
      23             :   NS_DECL_QUERYFRAME_TARGET(nsIPercentBSizeObserver)
      24             : 
      25             :   // Notify the observer that aReflowInput has no computed bsize,
      26             :   // but it has a percent bsize
      27             :   virtual void NotifyPercentBSize(const mozilla::ReflowInput& aReflowInput) = 0;
      28             : 
      29             :   // Ask the observer if it should observe aReflowInput.frame
      30             :   virtual bool NeedsToObserve(const mozilla::ReflowInput& aReflowInput) = 0;
      31             : };
      32             : 
      33             : #endif // nsIPercentBSizeObserver_h___