layout/base/nsStyleChangeList.h
author Ben Hearsum <bhearsum@mozilla.com>
Fri, 29 Aug 2008 09:25:45 -0400
changeset 18523 9eea398698242da00fe7f562d9cc62e920e9cb02
parent 13115 e1625ca024da69c0d7012fd018b16f0854d400f7
permissions -rw-r--r--
Added tag FIREFOX_3_1a2_RELEASE for changeset f197b51bbc29

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
 * 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);
  PRBool              operator==(const nsStyleChangeList& aOther) const;

  nsStyleChangeData*  mArray;
  PRInt32             mArraySize;
  PRInt32             mCount;
  nsStyleChangeData   mBuffer[kStyleChangeBufferSize];

private:
  nsStyleChangeList(const nsStyleChangeList&); // not implemented
};


#endif /* nsStyleChangeList_h___ */