gecko-dev/layout/base/nsLayoutHistoryState.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "nsILayoutHistoryState.h"
#include "nsHashtable.h"
#include "nsIStatefulFrame.h" // Get StateType enum
MOZ_DECL_CTOR_COUNTER(HistoryKey)
class HistoryKey: public nsVoidKey {
public:
HistoryKey(PRUint32 aContentID, nsIStatefulFrame::StateType aStateType)
: nsVoidKey((void*)(aContentID * nsIStatefulFrame::eNumStateTypes + aStateType)) {
}
HistoryKey(PRUint32 aKey)
: nsVoidKey((void*)aKey) {
}
};
class nsLayoutHistoryState : public nsILayoutHistoryState
{
public:
nsLayoutHistoryState();
virtual ~nsLayoutHistoryState();
NS_DECL_ISUPPORTS
// nsILayoutHistoryState
NS_IMETHOD AddState(PRUint32 aContentID,
nsIPresState* aState,
nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
NS_IMETHOD GetState(PRUint32 aContentID,
nsIPresState** aState,
nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
NS_IMETHOD RemoveState(PRUint32 aContentID,
nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
private:
nsSupportsHashtable mStates;
};
nsresult
NS_NewLayoutHistoryState(nsILayoutHistoryState** aState)
{
NS_PRECONDITION(aState != nsnull, "null ptr");
if (! aState)
return NS_ERROR_NULL_POINTER;
*aState = new nsLayoutHistoryState();
if (! *aState)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aState);
return NS_OK;
}
nsLayoutHistoryState::nsLayoutHistoryState()
{
NS_INIT_REFCNT();
}
nsLayoutHistoryState::~nsLayoutHistoryState()
{
}
NS_IMPL_ISUPPORTS(nsLayoutHistoryState,
NS_GET_IID(nsILayoutHistoryState));
NS_IMETHODIMP
nsLayoutHistoryState::AddState(PRUint32 aContentID,
nsIPresState* aState,
nsIStatefulFrame::StateType aStateType)
{
HistoryKey key(aContentID, aStateType);
/*
* nsSupportsHashtable::Put() returns false when no object has been
* replaced when inserting the new one, true if it some one was.
*
*/
PRBool replaced = mStates.Put (&key, aState);
if (replaced)
{
// done this way by indication of warren@netscape.com [ipg]
#if 0
printf("nsLayoutHistoryState::AddState OOPS!. There was already a state in the hash table for the key\n");
#endif
}
return NS_OK;
}
NS_IMETHODIMP
nsLayoutHistoryState::GetState(PRUint32 aContentID,
nsIPresState** aState,
nsIStatefulFrame::StateType aStateType)
{
nsresult rv = NS_OK;
HistoryKey key(aContentID, aStateType);
nsISupports *state = nsnull;
state = mStates.Get(&key);
if (state) {
*aState = (nsIPresState *)state;
}
else {
#if 0
printf("nsLayoutHistoryState::GetState, ERROR getting History state for the key\n");
#endif
*aState = nsnull;
rv = NS_OK;
}
return rv;
}
NS_IMETHODIMP
nsLayoutHistoryState::RemoveState(PRUint32 aContentID,
nsIStatefulFrame::StateType aStateType)
{
nsresult rv = NS_OK;
HistoryKey key(aContentID, aStateType);
mStates.Remove(&key);
return rv;
}