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123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 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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#ifndef nsSHistory_h
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#define nsSHistory_h
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// Helper Classes
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#include "nsCOMPtr.h"
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//Interfaces Needed
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#include "nsISHistory.h"
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#include "nsISHistoryInternal.h"
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#include "nsISHTransaction.h"
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#include "nsIWebNavigation.h"
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#include "nsIWeakReference.h"
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#include "nsISimpleEnumerator.h"
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#include "nsISHistoryListener.h"
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#include "nsIHistoryEntry.h"
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#include "nsTObserverArray.h"
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// Needed to maintain global list of all SHistory objects
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#include "prclist.h"
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class nsIDocShell;
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class nsSHEnumerator;
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class nsSHistoryObserver;
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class nsSHistory: public PRCList,
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public nsISHistory,
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public nsISHistoryInternal,
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public nsIWebNavigation
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{
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public:
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nsSHistory();
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NS_DECL_ISUPPORTS
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NS_DECL_NSISHISTORY
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NS_DECL_NSISHISTORYINTERNAL
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NS_DECL_NSIWEBNAVIGATION
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// One time initialization method called upon docshell module construction
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static nsresult Startup();
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static void Shutdown();
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static void UpdatePrefs();
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// Max number of total cached content viewers. If the pref
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// browser.sessionhistory.max_total_viewers is negative, then
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// this value is calculated based on the total amount of memory.
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// Otherwise, it comes straight from the pref.
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static uint32_t GetMaxTotalViewers() { return sHistoryMaxTotalViewers; }
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protected:
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virtual ~nsSHistory();
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friend class nsSHEnumerator;
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friend class nsSHistoryObserver;
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// Could become part of nsIWebNavigation
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NS_IMETHOD GetEntryAtIndex(int32_t aIndex, bool aModifyIndex, nsISHEntry** aResult);
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NS_IMETHOD GetTransactionAtIndex(int32_t aIndex, nsISHTransaction ** aResult);
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nsresult CompareFrames(nsISHEntry * prevEntry, nsISHEntry * nextEntry, nsIDocShell * rootDocShell, long aLoadType, bool * aIsFrameFound);
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nsresult InitiateLoad(nsISHEntry * aFrameEntry, nsIDocShell * aFrameDS, long aLoadType);
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NS_IMETHOD LoadEntry(int32_t aIndex, long aLoadType, uint32_t histCmd);
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#ifdef DEBUG
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nsresult PrintHistory();
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#endif
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// Evict content viewers in this window which don't lie in the "safe" range
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// around aIndex.
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void EvictOutOfRangeWindowContentViewers(int32_t aIndex);
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static void GloballyEvictContentViewers();
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static void GloballyEvictAllContentViewers();
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// Calculates a max number of total
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// content viewers to cache, based on amount of total memory
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static uint32_t CalcMaxTotalViewers();
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void RemoveDynEntries(int32_t aOldIndex, int32_t aNewIndex);
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nsresult LoadNextPossibleEntry(int32_t aNewIndex, long aLoadType, uint32_t aHistCmd);
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protected:
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// aIndex is the index of the transaction which may be removed.
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// If aKeepNext is true, aIndex is compared to aIndex + 1,
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// otherwise comparison is done to aIndex - 1.
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bool RemoveDuplicate(int32_t aIndex, bool aKeepNext);
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nsCOMPtr<nsISHTransaction> mListRoot;
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int32_t mIndex;
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int32_t mLength;
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int32_t mRequestedIndex;
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// Session History listeners
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nsAutoTObserverArray<nsWeakPtr, 2> mListeners;
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// Weak reference. Do not refcount this.
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nsIDocShell * mRootDocShell;
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// Max viewers allowed total, across all SHistory objects
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static int32_t sHistoryMaxTotalViewers;
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};
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//*****************************************************************************
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//*** nsSHEnumerator: Object Management
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//*****************************************************************************
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class nsSHEnumerator : public nsISimpleEnumerator
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSISIMPLEENUMERATOR
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nsSHEnumerator(nsSHistory * aHistory);
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protected:
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friend class nsSHistory;
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virtual ~nsSHEnumerator();
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private:
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int32_t mIndex;
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nsSHistory * mSHistory;
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};
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#endif /* nsSHistory */
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