gecko-dev/docshell/base/nsDocShellEnumerator.cpp

212 строки
5.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Mozilla browser.
*
* The Initial Developer of the Original Code is Netscape
* Communications, Inc. Portions created by Netscape are
* Copyright (C) 1999, Mozilla. All Rights Reserved.
*
* Author:
* Simon Fraser <sfraser@netscape.com>
*/
#include "nsDocShellEnumerator.h"
#include "nsIDocShellTreeNode.h"
nsDocShellEnumerator::nsDocShellEnumerator(PRInt32 inEnumerationDirection)
: mRootItem(nsnull)
, mItemArray(nsnull)
, mCurIndex(0)
, mDocShellType(nsIDocShellTreeItem::typeAll)
, mEnumerationDirection(inEnumerationDirection)
{
}
nsDocShellEnumerator::~nsDocShellEnumerator()
{
delete mItemArray;
}
NS_IMPL_ISUPPORTS1(nsDocShellEnumerator, nsISimpleEnumerator);
/* nsISupports getNext (); */
NS_IMETHODIMP nsDocShellEnumerator::GetNext(nsISupports **outCurItem)
{
NS_ENSURE_ARG_POINTER(outCurItem);
*outCurItem = nsnull;
nsresult rv = EnsureDocShellArray();
if (NS_FAILED(rv)) return rv;
if (mCurIndex >= 0 && mCurIndex < mItemArray->Count())
{
nsIDocShellTreeItem* thisItem = NS_REINTERPRET_CAST(nsIDocShellTreeItem*, mItemArray->ElementAt(mCurIndex));
rv = thisItem->QueryInterface(NS_GET_IID(nsISupports), (void **)outCurItem);
if (NS_FAILED(rv)) return rv;
}
else
return NS_ERROR_FAILURE;
mCurIndex ++;
return NS_OK;
}
/* boolean hasMoreElements (); */
NS_IMETHODIMP nsDocShellEnumerator::HasMoreElements(PRBool *outHasMore)
{
NS_ENSURE_ARG_POINTER(outHasMore);
*outHasMore = PR_FALSE;
nsresult rv = EnsureDocShellArray();
if (NS_FAILED(rv)) return rv;
*outHasMore = (mCurIndex < mItemArray->Count());
return NS_OK;
}
nsresult nsDocShellEnumerator::GetEnumerationRootItem(nsIDocShellTreeItem * *aEnumerationRootItem)
{
NS_ENSURE_ARG_POINTER(aEnumerationRootItem);
*aEnumerationRootItem = mRootItem;
NS_IF_ADDREF(*aEnumerationRootItem);
return NS_OK;
}
nsresult nsDocShellEnumerator::SetEnumerationRootItem(nsIDocShellTreeItem * aEnumerationRootItem)
{
mRootItem = aEnumerationRootItem;
ClearState();
return NS_OK;
}
nsresult nsDocShellEnumerator::GetEnumDocShellType(PRInt32 *aEnumerationItemType)
{
NS_ENSURE_ARG_POINTER(aEnumerationItemType);
*aEnumerationItemType = mDocShellType;
return NS_OK;
}
nsresult nsDocShellEnumerator::SetEnumDocShellType(PRInt32 aEnumerationItemType)
{
mDocShellType = aEnumerationItemType;
ClearState();
return NS_OK;
}
nsresult nsDocShellEnumerator::First()
{
mCurIndex = 0;
return EnsureDocShellArray();
}
nsresult nsDocShellEnumerator::EnsureDocShellArray()
{
if (!mItemArray)
{
mItemArray = new nsVoidArray;
if (!mItemArray) return NS_ERROR_OUT_OF_MEMORY;
return BuildDocShellArray(*mItemArray);
}
return NS_OK;
}
nsresult nsDocShellEnumerator::ClearState()
{
delete mItemArray;
mItemArray = nsnull;
mCurIndex = 0;
return NS_OK;
}
nsresult nsDocShellEnumerator::BuildDocShellArray(nsVoidArray& inItemArray)
{
NS_ENSURE_TRUE(mRootItem, NS_ERROR_NOT_INITIALIZED);
inItemArray.Clear();
return BuildArrayRecursive(mRootItem, inItemArray);
}
nsresult nsDocShellForwardsEnumerator::BuildArrayRecursive(nsIDocShellTreeItem* inItem, nsVoidArray& inItemArray)
{
nsresult rv;
nsCOMPtr<nsIDocShellTreeNode> itemAsNode = do_QueryInterface(inItem, &rv);
if (NS_FAILED(rv)) return rv;
PRInt32 itemType;
// add this item to the array
if ((mDocShellType == nsIDocShellTreeItem::typeAll) ||
(NS_SUCCEEDED(inItem->GetItemType(&itemType)) && (itemType == mDocShellType)))
{
rv = inItemArray.AppendElement((void *)inItem);
if (NS_FAILED(rv)) return rv;
}
PRInt32 numChildren;
rv = itemAsNode->GetChildCount(&numChildren);
if (NS_FAILED(rv)) return rv;
for (PRInt32 i = 0; i < numChildren; ++i)
{
nsCOMPtr<nsIDocShellTreeItem> curChild;
rv = itemAsNode->GetChildAt(i, getter_AddRefs(curChild));
if (NS_FAILED(rv)) return rv;
rv = BuildArrayRecursive(curChild, inItemArray);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
nsresult nsDocShellBackwardsEnumerator::BuildArrayRecursive(nsIDocShellTreeItem* inItem, nsVoidArray& inItemArray)
{
nsresult rv;
nsCOMPtr<nsIDocShellTreeNode> itemAsNode = do_QueryInterface(inItem, &rv);
if (NS_FAILED(rv)) return rv;
PRInt32 numChildren;
rv = itemAsNode->GetChildCount(&numChildren);
if (NS_FAILED(rv)) return rv;
for (PRInt32 i = numChildren - 1; i >= 0; --i)
{
nsCOMPtr<nsIDocShellTreeItem> curChild;
rv = itemAsNode->GetChildAt(i, getter_AddRefs(curChild));
if (NS_FAILED(rv)) return rv;
rv = BuildArrayRecursive(curChild, inItemArray);
if (NS_FAILED(rv)) return rv;
}
PRInt32 itemType;
// add this item to the array
if ((mDocShellType == nsIDocShellTreeItem::typeAll) ||
(NS_SUCCEEDED(inItem->GetItemType(&itemType)) && (itemType == mDocShellType)))
{
rv = inItemArray.AppendElement((void *)inItem);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}