/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 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
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 *
 * 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 Communicator client 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):
 *   Original Author: David Hyatt (hyatt@netscape.com)
 *
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 * 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"),
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#ifndef nsIReflowCallback_h___
#define nsIReflowCallback_h___

/**
 * Reflow callback interface.
 * These are not refcounted. Objects must be removed from the presshell
 * callback list before they die.
 * Protocol: objects will either get a ReflowFinished() call when a reflow
 * has finished or a ReflowCallbackCanceled() call if the shell is destroyed,
 * whichever happens first. If the object is explicitly removed from the shell
 * (using nsIPresShell::CancelReflowCallback()) before that occurs then neither
 * of the callback methods are called.
 */
class nsIReflowCallback {
public:
  /**
   * The presshell calls this when reflow has finished. Return PR_TRUE if
   * you need a Flush_Layout to happen after this.
   */
  virtual PRBool ReflowFinished() = 0;
  /**
   * The presshell calls this on outstanding callback requests in its
   * Destroy() method. The shell removes the request after calling
   * ReflowCallbackCanceled().
   */
  virtual void ReflowCallbackCanceled() = 0;
};

#endif /* nsIReflowCallback_h___ */
