gecko/layout/base/nsFrameManagerBase.h

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 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
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Pierre Phaneuf <pp@ludusdesign.com>
 *   Brian Ryner <bryner@brianryner.com>
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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 *
 * This Original Code has been modified by IBM Corporation. Modifications made
 * by IBM described herein are Copyright (c) International Business Machines
 * Corporation, 2000. Modifications to Mozilla code or documentation identified
 * per MPL Section 3.3
 *
 * Date             Modified by     Description of modification
 * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
 */

/* part of nsFrameManager, to work around header inclusionordering */

#ifndef _nsFrameManagerBase_h_
#define _nsFrameManagerBase_h_

#include "pldhash.h"

class nsIPresShell;
class nsStyleSet;
class nsIContent;
class nsPlaceholderFrame;
class nsIFrame;
class nsStyleContext;
class nsIAtom;
class nsStyleChangeList;
class nsILayoutHistoryState;

class nsFrameManagerBase
{
public:
  PRBool IsDestroyingFrames() { return mIsDestroyingFrames; }

  /*
   * Gets and sets the root frame (typically the viewport). The lifetime of the
   * root frame is controlled by the frame manager. When the frame manager is
   * destroyed, it destroys the entire frame hierarchy.
   */
  NS_HIDDEN_(nsIFrame*) GetRootFrame() const { return mRootFrame; }
  NS_HIDDEN_(void)      SetRootFrame(nsIFrame* aRootFrame)
  {
    NS_ASSERTION(!mRootFrame, "already have a root frame");
    mRootFrame = aRootFrame;
  }

protected:
  class UndisplayedMap;

  // weak link, because the pres shell owns us
  nsIPresShell*                   mPresShell;
  // the pres shell owns the style set
  nsStyleSet*                     mStyleSet;
  nsIFrame*                       mRootFrame;
  PLDHashTable                    mPlaceholderMap;
  UndisplayedMap*                 mUndisplayedMap;
  PRPackedBool                    mIsDestroyingFrames;  // The frame manager is destroying some frame(s).
};

#endif