The Tor Browser: layout/base/nsFrameManagerBase.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim:cindent:ts=2:et:sw=2:

     3  *

     4  * This Source Code Form is subject to the terms of the Mozilla Public

     5  * License, v. 2.0. If a copy of the MPL was not distributed with this

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.

     7  *

     8  * This Original Code has been modified by IBM Corporation. Modifications made

     9  * by IBM described herein are Copyright (c) International Business Machines

    10  * Corporation, 2000. Modifications to Mozilla code or documentation identified

    11  * per MPL Section 3.3

    12  *

    13  * Date             Modified by     Description of modification

    14  * 04/20/2000       IBM Corp.      OS/2 VisualAge build.

    15  */

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

    19 #ifndef _nsFrameManagerBase_h_

    20 #define _nsFrameManagerBase_h_

    22 #include "pldhash.h"

    24 class nsIPresShell;

    25 class nsStyleSet;

    26 class nsIContent;

    27 class nsPlaceholderFrame;

    28 class nsIFrame;

    29 class nsStyleContext;

    30 class nsIAtom;

    31 class nsStyleChangeList;

    32 class nsILayoutHistoryState;

    34 class nsFrameManagerBase

    35 {

    36 public:

    37   nsFrameManagerBase()

    38   {

    39     memset(this, '\0', sizeof(nsFrameManagerBase));

    40   }

    42   bool IsDestroyingFrames() { return mIsDestroyingFrames; }

    44   /*

    45    * Gets and sets the root frame (typically the viewport). The lifetime of the

    46    * root frame is controlled by the frame manager. When the frame manager is

    47    * destroyed, it destroys the entire frame hierarchy.

    48    */

    49   NS_HIDDEN_(nsIFrame*) GetRootFrame() const { return mRootFrame; }

    50   NS_HIDDEN_(void)      SetRootFrame(nsIFrame* aRootFrame)

    51   {

    52     NS_ASSERTION(!mRootFrame, "already have a root frame");

    53     mRootFrame = aRootFrame;

    54   }

    56   static uint32_t GetGlobalGenerationNumber() { return sGlobalGenerationNumber; }

    58 protected:

    59   class UndisplayedMap;

    61   // weak link, because the pres shell owns us

    62   nsIPresShell*                   mPresShell;

    63   // the pres shell owns the style set

    64   nsStyleSet*                     mStyleSet;

    65   nsIFrame*                       mRootFrame;

    66   PLDHashTable                    mPlaceholderMap;

    67   UndisplayedMap*                 mUndisplayedMap;

    68   bool                            mIsDestroyingFrames;  // The frame manager is destroying some frame(s).

    70   // The frame tree generation number

    71   // We use this to avoid unnecessary screenshotting

    72   // on Android. Unfortunately, this is static to match

    73   // the single consumer which is also static. Keeping

    74   // this the same greatly simplifies lifetime issues and

    75   // makes sure we always using the correct number.

    76   // A per PresContext generation number is available

    77   // via nsPresContext::GetDOMGeneration

    78   static uint32_t                 sGlobalGenerationNumber;

    79 };

    81 #endif

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