gecko/docshell/base/nsDocShellEnumerator.cpp
2012-07-30 17:20:58 +03:00

190 lines
4.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsDocShellEnumerator.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeNode.h"
nsDocShellEnumerator::nsDocShellEnumerator(PRInt32 inEnumerationDirection)
: mRootItem(nullptr)
, mCurIndex(0)
, mDocShellType(nsIDocShellTreeItem::typeAll)
, mArrayValid(false)
, mEnumerationDirection(inEnumerationDirection)
{
}
nsDocShellEnumerator::~nsDocShellEnumerator()
{
}
NS_IMPL_ISUPPORTS1(nsDocShellEnumerator, nsISimpleEnumerator)
/* nsISupports getNext (); */
NS_IMETHODIMP nsDocShellEnumerator::GetNext(nsISupports **outCurItem)
{
NS_ENSURE_ARG_POINTER(outCurItem);
*outCurItem = nullptr;
nsresult rv = EnsureDocShellArray();
if (NS_FAILED(rv)) return rv;
if (mCurIndex >= mItemArray.Length()) {
return NS_ERROR_FAILURE;
}
// post-increment is important here
nsCOMPtr<nsISupports> item = do_QueryReferent(mItemArray[mCurIndex++], &rv);
item.forget(outCurItem);
return rv;
}
/* boolean hasMoreElements (); */
NS_IMETHODIMP nsDocShellEnumerator::HasMoreElements(bool *outHasMore)
{
NS_ENSURE_ARG_POINTER(outHasMore);
*outHasMore = false;
nsresult rv = EnsureDocShellArray();
if (NS_FAILED(rv)) return rv;
*outHasMore = (mCurIndex < mItemArray.Length());
return NS_OK;
}
nsresult nsDocShellEnumerator::GetEnumerationRootItem(nsIDocShellTreeItem * *aEnumerationRootItem)
{
NS_ENSURE_ARG_POINTER(aEnumerationRootItem);
nsCOMPtr<nsIDocShellTreeItem> item = do_QueryReferent(mRootItem);
item.forget(aEnumerationRootItem);
return NS_OK;
}
nsresult nsDocShellEnumerator::SetEnumerationRootItem(nsIDocShellTreeItem * aEnumerationRootItem)
{
mRootItem = do_GetWeakReference(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 (!mArrayValid)
{
mArrayValid = true;
return BuildDocShellArray(mItemArray);
}
return NS_OK;
}
nsresult nsDocShellEnumerator::ClearState()
{
mItemArray.Clear();
mArrayValid = false;
mCurIndex = 0;
return NS_OK;
}
nsresult nsDocShellEnumerator::BuildDocShellArray(nsTArray<nsWeakPtr>& inItemArray)
{
NS_ENSURE_TRUE(mRootItem, NS_ERROR_NOT_INITIALIZED);
inItemArray.Clear();
nsCOMPtr<nsIDocShellTreeItem> item = do_QueryReferent(mRootItem);
return BuildArrayRecursive(item, inItemArray);
}
nsresult nsDocShellForwardsEnumerator::BuildArrayRecursive(nsIDocShellTreeItem* inItem, nsTArray<nsWeakPtr>& 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)))
{
if (!inItemArray.AppendElement(do_GetWeakReference(inItem)))
return NS_ERROR_OUT_OF_MEMORY;
}
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, nsTArray<nsWeakPtr>& 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)))
{
if (!inItemArray.AppendElement(do_GetWeakReference(inItem)))
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}