layout/base/nsILayoutHistoryState.h
author ted.mielczarek@gmail.com
Mon, 04 Feb 2008 07:17:11 -0800
changeset 11206 264371cea63972c64329c43338ef7004674d3122
parent 3727 638e3d4c61ab20bfa40506d1856cf5c0e82af579
child 22262 4047bed537d67f61567d6fa546da47cdab3dda35
permissions -rw-r--r--
bug 407459 - hook up new allocator to our build. just checking in the memory/jemalloc dir and the client.mk change to pull it. r=bsmedberg a=beltzner

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
 * interface for container for information saved in session history when
 * the document is not
 */

#ifndef _nsILayoutHistoryState_h
#define _nsILayoutHistoryState_h

#include "nsISupports.h"
#include "nsStringFwd.h"

class nsPresState;

#define NS_ILAYOUTHISTORYSTATE_IID \
{ 0x99003f0f, 0x7ade, 0x44a1, \
 { 0x81, 0x74, 0xe3, 0x6a, 0xa5, 0xbb, 0x6b, 0x10 } }

class nsILayoutHistoryState : public nsISupports {
 public: 
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILAYOUTHISTORYSTATE_IID)

  /**
   * Set |aState| as the state object for |aKey|.
   * This _transfers_ownership_ of |aState| to the LayoutHistoryState.
   * It will be freed when RemoveState() is called or when the
   * LayoutHistoryState is destroyed.
   */
  NS_IMETHOD AddState(const nsCString& aKey, nsPresState* aState) = 0;

  /**
   * Look up the state object for |aKey|.
   */
  NS_IMETHOD GetState(const nsCString& aKey, nsPresState** aState) = 0;

  /**
   * Remove the state object for |aKey|.
   */
  NS_IMETHOD RemoveState(const nsCString& aKey) = 0;

  /**
   * Check whether this history has any states in it
   */
  NS_IMETHOD_(PRBool) HasStates() const = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsILayoutHistoryState,
                              NS_ILAYOUTHISTORYSTATE_IID)

nsresult
NS_NewLayoutHistoryState(nsILayoutHistoryState** aState);

#endif /* _nsILayoutHistoryState_h */