mirror of
https://github.com/mozilla/gecko-dev.git
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178 lines
4.4 KiB
C++
178 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsDocShellEnumerator.h"
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#include "nsIDocShellTreeItem.h"
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nsDocShellEnumerator::nsDocShellEnumerator(int32_t inEnumerationDirection)
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: mRootItem(nullptr)
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, mCurIndex(0)
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, mDocShellType(nsIDocShellTreeItem::typeAll)
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, mArrayValid(false)
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, mEnumerationDirection(inEnumerationDirection)
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{
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}
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nsDocShellEnumerator::~nsDocShellEnumerator()
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{
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}
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NS_IMPL_ISUPPORTS(nsDocShellEnumerator, nsISimpleEnumerator)
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/* nsISupports getNext (); */
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NS_IMETHODIMP nsDocShellEnumerator::GetNext(nsISupports **outCurItem)
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{
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NS_ENSURE_ARG_POINTER(outCurItem);
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*outCurItem = nullptr;
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nsresult rv = EnsureDocShellArray();
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if (NS_FAILED(rv)) return rv;
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if (mCurIndex >= mItemArray.Length()) {
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return NS_ERROR_FAILURE;
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}
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// post-increment is important here
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nsCOMPtr<nsISupports> item = do_QueryReferent(mItemArray[mCurIndex++], &rv);
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item.forget(outCurItem);
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return rv;
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}
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/* boolean hasMoreElements (); */
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NS_IMETHODIMP nsDocShellEnumerator::HasMoreElements(bool *outHasMore)
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{
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NS_ENSURE_ARG_POINTER(outHasMore);
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*outHasMore = false;
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nsresult rv = EnsureDocShellArray();
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if (NS_FAILED(rv)) return rv;
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*outHasMore = (mCurIndex < mItemArray.Length());
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::GetEnumerationRootItem(nsIDocShellTreeItem * *aEnumerationRootItem)
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{
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NS_ENSURE_ARG_POINTER(aEnumerationRootItem);
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nsCOMPtr<nsIDocShellTreeItem> item = do_QueryReferent(mRootItem);
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item.forget(aEnumerationRootItem);
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::SetEnumerationRootItem(nsIDocShellTreeItem * aEnumerationRootItem)
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{
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mRootItem = do_GetWeakReference(aEnumerationRootItem);
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ClearState();
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::GetEnumDocShellType(int32_t *aEnumerationItemType)
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{
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NS_ENSURE_ARG_POINTER(aEnumerationItemType);
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*aEnumerationItemType = mDocShellType;
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::SetEnumDocShellType(int32_t aEnumerationItemType)
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{
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mDocShellType = aEnumerationItemType;
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ClearState();
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::First()
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{
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mCurIndex = 0;
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return EnsureDocShellArray();
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}
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nsresult nsDocShellEnumerator::EnsureDocShellArray()
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{
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if (!mArrayValid)
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{
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mArrayValid = true;
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return BuildDocShellArray(mItemArray);
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}
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::ClearState()
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{
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mItemArray.Clear();
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mArrayValid = false;
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mCurIndex = 0;
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return NS_OK;
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}
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nsresult nsDocShellEnumerator::BuildDocShellArray(nsTArray<nsWeakPtr>& inItemArray)
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{
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NS_ENSURE_TRUE(mRootItem, NS_ERROR_NOT_INITIALIZED);
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inItemArray.Clear();
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nsCOMPtr<nsIDocShellTreeItem> item = do_QueryReferent(mRootItem);
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return BuildArrayRecursive(item, inItemArray);
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}
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nsresult nsDocShellForwardsEnumerator::BuildArrayRecursive(nsIDocShellTreeItem* inItem, nsTArray<nsWeakPtr>& inItemArray)
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{
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nsresult rv;
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// add this item to the array
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if (mDocShellType == nsIDocShellTreeItem::typeAll ||
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inItem->ItemType() == mDocShellType) {
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if (!inItemArray.AppendElement(do_GetWeakReference(inItem)))
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return NS_ERROR_OUT_OF_MEMORY;
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}
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int32_t numChildren;
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rv = inItem->GetChildCount(&numChildren);
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if (NS_FAILED(rv)) return rv;
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for (int32_t i = 0; i < numChildren; ++i)
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{
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nsCOMPtr<nsIDocShellTreeItem> curChild;
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rv = inItem->GetChildAt(i, getter_AddRefs(curChild));
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if (NS_FAILED(rv)) return rv;
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rv = BuildArrayRecursive(curChild, inItemArray);
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if (NS_FAILED(rv)) return rv;
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}
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return NS_OK;
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}
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nsresult nsDocShellBackwardsEnumerator::BuildArrayRecursive(nsIDocShellTreeItem* inItem, nsTArray<nsWeakPtr>& inItemArray)
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{
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nsresult rv;
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int32_t numChildren;
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rv = inItem->GetChildCount(&numChildren);
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if (NS_FAILED(rv)) return rv;
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for (int32_t i = numChildren - 1; i >= 0; --i)
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{
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nsCOMPtr<nsIDocShellTreeItem> curChild;
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rv = inItem->GetChildAt(i, getter_AddRefs(curChild));
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if (NS_FAILED(rv)) return rv;
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rv = BuildArrayRecursive(curChild, inItemArray);
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if (NS_FAILED(rv)) return rv;
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}
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// add this item to the array
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if (mDocShellType == nsIDocShellTreeItem::typeAll ||
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inItem->ItemType() == mDocShellType) {
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if (!inItemArray.AppendElement(do_GetWeakReference(inItem)))
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return NS_OK;
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}
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