gecko-dev/layout/base/nsStyleChangeList.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* 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
* http://www.mozilla.org/MPL/
*
* 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.org 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):
*
* Alternatively, the contents of this file may be used under the terms of
* 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"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
/*
* a list of the recomputation that needs to be done in response to a
* style change
*/
#ifndef nsStyleChangeList_h___
#define nsStyleChangeList_h___
#include "nsError.h"
#include "nsChangeHint.h"
class nsIFrame;
class nsIContent;
// XXX would all platforms support putting this inside the list?
struct nsStyleChangeData {
nsIFrame* mFrame;
nsIContent* mContent;
nsChangeHint mHint;
};
static const PRUint32 kStyleChangeBufferSize = 10;
// Note: nsStyleChangeList owns a reference to
// nsIContent pointers in its list.
class nsStyleChangeList {
public:
nsStyleChangeList();
~nsStyleChangeList();
PRInt32 Count(void) const {
return mCount;
}
/**
* Fills in pointers without reference counting.
*/
nsresult ChangeAt(PRInt32 aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
nsChangeHint& aHint) const;
/**
* Fills in a pointer to the list entry storage (no reference counting
* involved).
*/
nsresult ChangeAt(PRInt32 aIndex, const nsStyleChangeData** aChangeData) const;
nsresult AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint);
void Clear(void);
protected:
nsStyleChangeList& operator=(const nsStyleChangeList& aCopy);
bool operator==(const nsStyleChangeList& aOther) const;
nsStyleChangeData* mArray;
PRInt32 mArraySize;
PRInt32 mCount;
nsStyleChangeData mBuffer[kStyleChangeBufferSize];
private:
nsStyleChangeList(const nsStyleChangeList&); // not implemented
};
#endif /* nsStyleChangeList_h___ */