michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsIPercentHeightObserver_h___
michael@0: #define nsIPercentHeightObserver_h___
michael@0: 
michael@0: #include "nsQueryFrame.h"
michael@0: 
michael@0: struct nsHTMLReflowState;
michael@0: 
michael@0: /**
michael@0:  * This interface is supported by frames that need to provide computed height
michael@0:  * values to children during reflow which would otherwise not happen. Currently only
michael@0:  * table cells support this.
michael@0:  */
michael@0: class nsIPercentHeightObserver
michael@0: {
michael@0: public:
michael@0:   NS_DECL_QUERYFRAME_TARGET(nsIPercentHeightObserver)
michael@0: 
michael@0:   // Notify the observer that aReflowState has no computed height, but it has a percent height
michael@0:   virtual void NotifyPercentHeight(const nsHTMLReflowState& aReflowState) = 0;
michael@0: 
michael@0:   // Ask the observer if it should observe aReflowState.frame
michael@0:   virtual bool NeedsToObserve(const nsHTMLReflowState& aReflowState) = 0;
michael@0: };
michael@0: 
michael@0: #endif // nsIPercentHeightObserver_h___