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5e678dc998
This generation number will be incremented every time that the frame tree for a presshell changes. Callers need to deal with the case where this value overflows. We use this to avoid a bunch of Android screenshotting.
82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim:cindent:ts=2:et:sw=2:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This Original Code has been modified by IBM Corporation. Modifications made
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* by IBM described herein are Copyright (c) International Business Machines
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* Corporation, 2000. Modifications to Mozilla code or documentation identified
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* per MPL Section 3.3
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*
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* Date Modified by Description of modification
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* 04/20/2000 IBM Corp. OS/2 VisualAge build.
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*/
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/* part of nsFrameManager, to work around header inclusionordering */
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#ifndef _nsFrameManagerBase_h_
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#define _nsFrameManagerBase_h_
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#include "pldhash.h"
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class nsIPresShell;
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class nsStyleSet;
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class nsIContent;
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class nsPlaceholderFrame;
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class nsIFrame;
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class nsStyleContext;
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class nsIAtom;
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class nsStyleChangeList;
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class nsILayoutHistoryState;
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class nsFrameManagerBase
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{
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public:
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nsFrameManagerBase()
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{
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memset(this, '\0', sizeof(nsFrameManagerBase));
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}
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bool IsDestroyingFrames() { return mIsDestroyingFrames; }
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/*
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* Gets and sets the root frame (typically the viewport). The lifetime of the
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* root frame is controlled by the frame manager. When the frame manager is
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* destroyed, it destroys the entire frame hierarchy.
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*/
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NS_HIDDEN_(nsIFrame*) GetRootFrame() const { return mRootFrame; }
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NS_HIDDEN_(void) SetRootFrame(nsIFrame* aRootFrame)
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{
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NS_ASSERTION(!mRootFrame, "already have a root frame");
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mRootFrame = aRootFrame;
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}
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static PRUint32 GetGlobalGenerationNumber() { return sGlobalGenerationNumber; }
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protected:
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class UndisplayedMap;
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// weak link, because the pres shell owns us
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nsIPresShell* mPresShell;
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// the pres shell owns the style set
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nsStyleSet* mStyleSet;
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nsIFrame* mRootFrame;
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PLDHashTable mPlaceholderMap;
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UndisplayedMap* mUndisplayedMap;
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bool mIsDestroyingFrames; // The frame manager is destroying some frame(s).
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// The frame tree generation number
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// We use this to avoid unnecessary screenshotting
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// on Android. Unfortunately, this is static to match
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// the single consumer which is also static. Keeping
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// this the same greatly simplifies lifetime issues and
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// makes sure we always using the correct number.
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// A per PresContext generation number is available
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// via nsPresContext::GetDOMGeneration
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static PRUint32 sGlobalGenerationNumber;
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};
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#endif
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