gecko-dev/layout/base/nsIPercentHeightObserver.h
2012-05-21 12:12:37 +01:00

31 lines
1.0 KiB
C++

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