gecko-dev/editor/txmgr/nsTransactionStack.cpp

97 строки
2.2 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 "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsISupportsUtils.h"
#include "nsTransactionItem.h"
#include "nsTransactionStack.h"
#include "nscore.h"
nsTransactionStack::nsTransactionStack(nsTransactionStack::Type aType)
: mType(aType)
{
}
nsTransactionStack::~nsTransactionStack()
{
Clear();
}
void
nsTransactionStack::Push(nsTransactionItem *aTransaction)
{
if (!aTransaction) {
return;
}
// The stack's bottom is the front of the deque, and the top is the back.
mDeque.push_back(aTransaction);
}
already_AddRefed<nsTransactionItem>
nsTransactionStack::Pop()
{
if (mDeque.empty()) {
return nullptr;
}
nsRefPtr<nsTransactionItem> ret = mDeque.back().forget();
mDeque.pop_back();
return ret.forget();
}
already_AddRefed<nsTransactionItem>
nsTransactionStack::PopBottom()
{
if (mDeque.empty()) {
return nullptr;
}
nsRefPtr<nsTransactionItem> ret = mDeque.front().forget();
mDeque.pop_front();
return ret.forget();
}
already_AddRefed<nsTransactionItem>
nsTransactionStack::Peek()
{
if (mDeque.empty()) {
return nullptr;
}
nsRefPtr<nsTransactionItem> ret = mDeque.back();
return ret.forget();
}
already_AddRefed<nsTransactionItem>
nsTransactionStack::GetItem(int32_t aIndex)
{
if (aIndex < 0 || aIndex >= static_cast<int32_t>(mDeque.size())) {
return nullptr;
}
nsRefPtr<nsTransactionItem> ret = mDeque[aIndex];
return ret.forget();
}
void
nsTransactionStack::Clear()
{
while (!mDeque.empty()) {
nsRefPtr<nsTransactionItem> tx = mType == FOR_UNDO ? Pop() : PopBottom();
};
}
void
nsTransactionStack::DoTraverse(nsCycleCollectionTraversalCallback &cb)
{
int32_t size = mDeque.size();
for (int32_t i = 0; i < size; ++i) {
nsTransactionItem* item = mDeque[i];
if (item) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "transaction stack mDeque[i]");
cb.NoteNativeChild(item, NS_CYCLE_COLLECTION_PARTICIPANT(nsTransactionItem));
}
}
}