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146 lines
3.9 KiB
C++
146 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsILayoutHistoryState.h"
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#include "nsHashtable.h"
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#include "nsIStatefulFrame.h" // Get StateType enum
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MOZ_DECL_CTOR_COUNTER(HistoryKey);
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class HistoryKey: public nsHashKey {
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private:
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PRUint32 itsHash;
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public:
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HistoryKey(PRUint32 aContentID, nsIStatefulFrame::StateType aStateType) {
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MOZ_COUNT_CTOR(HistoryKey);
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itsHash = aContentID * nsIStatefulFrame::eNumStateTypes + aStateType;
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}
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HistoryKey(PRUint32 aKey) {
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MOZ_COUNT_CTOR(HistoryKey);
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itsHash = aKey;
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}
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~HistoryKey() {
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MOZ_COUNT_DTOR(HistoryKey);
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}
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PRUint32 HashValue(void) const {
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return itsHash;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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return (itsHash == (((const HistoryKey *) aKey)->HashValue())) ? PR_TRUE : PR_FALSE;
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}
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nsHashKey *Clone(void) const {
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return new HistoryKey(itsHash);
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}
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};
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class nsLayoutHistoryState : public nsILayoutHistoryState
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{
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public:
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nsLayoutHistoryState();
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virtual ~nsLayoutHistoryState();
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NS_DECL_ISUPPORTS
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// nsILayoutHistoryState
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NS_IMETHOD AddState(PRUint32 aContentID,
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nsISupports* aState,
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nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
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NS_IMETHOD GetState(PRUint32 aContentID,
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nsISupports** aState,
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nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
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private:
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nsSupportsHashtable mStates;
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};
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nsresult
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NS_NewLayoutHistoryState(nsILayoutHistoryState** aState)
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{
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NS_PRECONDITION(aState != nsnull, "null ptr");
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if (! aState)
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return NS_ERROR_NULL_POINTER;
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*aState = new nsLayoutHistoryState();
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if (! *aState)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aState);
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return NS_OK;
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}
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nsLayoutHistoryState::nsLayoutHistoryState()
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{
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NS_INIT_REFCNT();
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}
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nsLayoutHistoryState::~nsLayoutHistoryState()
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{
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}
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NS_IMPL_ISUPPORTS(nsLayoutHistoryState,
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nsILayoutHistoryState::GetIID());
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NS_IMETHODIMP
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nsLayoutHistoryState::AddState(PRUint32 aContentID,
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nsISupports* aState,
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nsIStatefulFrame::StateType aStateType)
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{
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nsresult rv = NS_OK;
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HistoryKey key(aContentID, aStateType);
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void * res = mStates.Put(&key, (void *) aState);
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/* nsHashTable seems to return null when it actually added
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* the element in to the table. If another element was already
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* present in the table for the key, it seems to return the
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* element that was already present. Not sure if that was
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* the intended behavior
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*/
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if (res) {
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printf("nsLayoutHistoryState::AddState OOPS!. There was already a state in the hash table for the key\n");
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rv = NS_ERROR_UNEXPECTED;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsLayoutHistoryState::GetState(PRUint32 aContentID,
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nsISupports** aState,
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nsIStatefulFrame::StateType aStateType)
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{
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nsresult rv = NS_OK;
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HistoryKey key(aContentID, aStateType);
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void * state = nsnull;
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state = mStates.Get(&key);
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if (state) {
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*aState = (nsISupports *)state;
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}
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else {
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printf("nsLayoutHistoryState::GetState, ERROR getting History state for the key\n");
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*aState = nsnull;
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rv = NS_ERROR_NULL_POINTER;
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}
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return rv;
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}
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