зеркало из https://github.com/mozilla/gecko-dev.git
147 строки
4.0 KiB
C++
147 строки
4.0 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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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 nsVoidKey {
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public:
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HistoryKey(PRUint32 aContentID, nsIStatefulFrame::StateType aStateType)
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: nsVoidKey((void*)(aContentID * nsIStatefulFrame::eNumStateTypes + aStateType)) {
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}
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HistoryKey(PRUint32 aKey)
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: nsVoidKey((void*)aKey) {
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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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nsIPresState* aState,
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nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
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NS_IMETHOD GetState(PRUint32 aContentID,
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nsIPresState** aState,
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nsIStatefulFrame::StateType aStateType = nsIStatefulFrame::eNoType);
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NS_IMETHOD RemoveState(PRUint32 aContentID,
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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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NS_GET_IID(nsILayoutHistoryState));
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NS_IMETHODIMP
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nsLayoutHistoryState::AddState(PRUint32 aContentID,
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nsIPresState* aState,
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nsIStatefulFrame::StateType aStateType)
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{
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HistoryKey key(aContentID, aStateType);
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/*
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* nsSupportsHashtable::Put() returns false when no object has been
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* replaced when inserting the new one, true if it some one was.
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*
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*/
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PRBool replaced = mStates.Put (&key, aState);
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if (replaced)
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{
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// done this way by indication of warren@netscape.com [ipg]
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#if 0
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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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#endif
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLayoutHistoryState::GetState(PRUint32 aContentID,
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nsIPresState** 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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nsISupports *state = nsnull;
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state = mStates.Get(&key);
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if (state) {
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*aState = (nsIPresState *)state;
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}
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else {
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#if 0
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printf("nsLayoutHistoryState::GetState, ERROR getting History state for the key\n");
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#endif
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*aState = nsnull;
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rv = NS_OK;
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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::RemoveState(PRUint32 aContentID,
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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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mStates.Remove(&key);
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return rv;
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}
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