RetroZilla/layout/base/nsIPercentHeightObserver.h
2015-10-20 23:03:22 -04:00

66 lines
2.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIPercentHeightObserver_h___
#define nsIPercentHeightObserver_h___
struct nsHTMLReflowState;
class nsPresContext;
// IID for the nsIPercentHeightObserver interface
#define NS_IPERCENTHEIGHTOBSERVER_IID \
{ 0x9cdc174b, 0x4f39, 0x41ad, {0xbc, 0x16, 0x5a, 0xc5, 0xa8, 0x64, 0x14, 0xa1}}
/**
* 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 nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IPERCENTHEIGHTOBSERVER_IID)
// 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 PRBool NeedsToObserve(const nsHTMLReflowState& aReflowState) = 0;
};
#endif // nsIPercentHeightObserver_h___