michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim:cindent:ts=2:et:sw=2:
michael@0:  *
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:  * This Original Code has been modified by IBM Corporation. Modifications made
michael@0:  * by IBM described herein are Copyright (c) International Business Machines
michael@0:  * Corporation, 2000. Modifications to Mozilla code or documentation identified
michael@0:  * per MPL Section 3.3
michael@0:  *
michael@0:  * Date             Modified by     Description of modification
michael@0:  * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
michael@0:  */
michael@0: 
michael@0: /* part of nsFrameManager, to work around header inclusionordering */
michael@0: 
michael@0: #ifndef _nsFrameManagerBase_h_
michael@0: #define _nsFrameManagerBase_h_
michael@0: 
michael@0: #include "pldhash.h"
michael@0: 
michael@0: class nsIPresShell;
michael@0: class nsStyleSet;
michael@0: class nsIContent;
michael@0: class nsPlaceholderFrame;
michael@0: class nsIFrame;
michael@0: class nsStyleContext;
michael@0: class nsIAtom;
michael@0: class nsStyleChangeList;
michael@0: class nsILayoutHistoryState;
michael@0: 
michael@0: class nsFrameManagerBase
michael@0: {
michael@0: public:
michael@0:   nsFrameManagerBase()
michael@0:   {
michael@0:     memset(this, '\0', sizeof(nsFrameManagerBase));
michael@0:   }
michael@0: 
michael@0:   bool IsDestroyingFrames() { return mIsDestroyingFrames; }
michael@0: 
michael@0:   /*
michael@0:    * Gets and sets the root frame (typically the viewport). The lifetime of the
michael@0:    * root frame is controlled by the frame manager. When the frame manager is
michael@0:    * destroyed, it destroys the entire frame hierarchy.
michael@0:    */
michael@0:   NS_HIDDEN_(nsIFrame*) GetRootFrame() const { return mRootFrame; }
michael@0:   NS_HIDDEN_(void)      SetRootFrame(nsIFrame* aRootFrame)
michael@0:   {
michael@0:     NS_ASSERTION(!mRootFrame, "already have a root frame");
michael@0:     mRootFrame = aRootFrame;
michael@0:   }
michael@0: 
michael@0:   static uint32_t GetGlobalGenerationNumber() { return sGlobalGenerationNumber; }
michael@0: 
michael@0: protected:
michael@0:   class UndisplayedMap;
michael@0: 
michael@0:   // weak link, because the pres shell owns us
michael@0:   nsIPresShell*                   mPresShell;
michael@0:   // the pres shell owns the style set
michael@0:   nsStyleSet*                     mStyleSet;
michael@0:   nsIFrame*                       mRootFrame;
michael@0:   PLDHashTable                    mPlaceholderMap;
michael@0:   UndisplayedMap*                 mUndisplayedMap;
michael@0:   bool                            mIsDestroyingFrames;  // The frame manager is destroying some frame(s).
michael@0: 
michael@0:   // The frame tree generation number
michael@0:   // We use this to avoid unnecessary screenshotting
michael@0:   // on Android. Unfortunately, this is static to match
michael@0:   // the single consumer which is also static. Keeping
michael@0:   // this the same greatly simplifies lifetime issues and
michael@0:   // makes sure we always using the correct number.
michael@0:   // A per PresContext generation number is available
michael@0:   // via nsPresContext::GetDOMGeneration
michael@0:   static uint32_t                 sGlobalGenerationNumber;
michael@0: };
michael@0: 
michael@0: #endif