mirror of
https://github.com/classilla/tenfourfox.git
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206 lines
4.5 KiB
C++
206 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 aEnumerationDirection)
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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(aEnumerationDirection)
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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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NS_IMETHODIMP
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nsDocShellEnumerator::GetNext(nsISupports** aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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*aResult = nullptr;
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nsresult rv = EnsureDocShellArray();
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if (NS_FAILED(rv)) {
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return rv;
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}
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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(aResult);
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return rv;
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}
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NS_IMETHODIMP
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nsDocShellEnumerator::HasMoreElements(bool* aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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*aResult = false;
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nsresult rv = EnsureDocShellArray();
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if (NS_FAILED(rv)) {
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return rv;
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}
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*aResult = (mCurIndex < mItemArray.Length());
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return NS_OK;
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}
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nsresult
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nsDocShellEnumerator::GetEnumerationRootItem(
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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
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nsDocShellEnumerator::SetEnumerationRootItem(
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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
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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
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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
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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
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nsDocShellEnumerator::EnsureDocShellArray()
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{
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if (!mArrayValid) {
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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
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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
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nsDocShellEnumerator::BuildDocShellArray(nsTArray<nsWeakPtr>& aItemArray)
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{
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NS_ENSURE_TRUE(mRootItem, NS_ERROR_NOT_INITIALIZED);
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aItemArray.Clear();
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nsCOMPtr<nsIDocShellTreeItem> item = do_QueryReferent(mRootItem);
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return BuildArrayRecursive(item, aItemArray);
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}
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nsresult
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nsDocShellForwardsEnumerator::BuildArrayRecursive(
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nsIDocShellTreeItem* aItem,
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nsTArray<nsWeakPtr>& aItemArray)
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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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aItem->ItemType() == mDocShellType) {
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if (!aItemArray.AppendElement(do_GetWeakReference(aItem))) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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int32_t numChildren;
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rv = aItem->GetChildCount(&numChildren);
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if (NS_FAILED(rv)) {
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return rv;
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}
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for (int32_t i = 0; i < numChildren; ++i) {
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nsCOMPtr<nsIDocShellTreeItem> curChild;
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rv = aItem->GetChildAt(i, getter_AddRefs(curChild));
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = BuildArrayRecursive(curChild, aItemArray);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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return NS_OK;
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}
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nsresult
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nsDocShellBackwardsEnumerator::BuildArrayRecursive(
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nsIDocShellTreeItem* aItem,
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nsTArray<nsWeakPtr>& aItemArray)
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{
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nsresult rv;
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int32_t numChildren;
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rv = aItem->GetChildCount(&numChildren);
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if (NS_FAILED(rv)) {
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return rv;
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}
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for (int32_t i = numChildren - 1; i >= 0; --i) {
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nsCOMPtr<nsIDocShellTreeItem> curChild;
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rv = aItem->GetChildAt(i, getter_AddRefs(curChild));
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = BuildArrayRecursive(curChild, aItemArray);
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if (NS_FAILED(rv)) {
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return rv;
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}
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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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aItem->ItemType() == mDocShellType) {
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if (!aItemArray.AppendElement(do_GetWeakReference(aItem))) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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return NS_OK;
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}
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