The Tor Browser: comparison editor/txmgr/src/nsTransactionItem.cpp

--1:000000000000
+:8379115a5106
+/* -*- 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 "mozilla/mozalloc.h"
+#include "nsAutoPtr.h"
+#include "nsCOMPtr.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsISupportsImpl.h"
+#include "nsITransaction.h"
+#include "nsTransactionItem.h"
+#include "nsTransactionManager.h"
+#include "nsTransactionStack.h"
+nsTransactionItem::nsTransactionItem(nsITransaction *aTransaction)
+: mTransaction(aTransaction), mUndoStack(0), mRedoStack(0)
+{
+}
+nsTransactionItem::~nsTransactionItem()
+{
+delete mRedoStack;
+delete mUndoStack;
+}
+void
+nsTransactionItem::CleanUp()
+{
+mData.Clear();
+mTransaction = nullptr;
+if (mRedoStack) {
+mRedoStack->DoUnlink();
+}
+if (mUndoStack) {
+mUndoStack->DoUnlink();
+}
+}
+NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(nsTransactionItem)
+NS_IMPL_CYCLE_COLLECTING_NATIVE_RELEASE_WITH_LAST_RELEASE(nsTransactionItem,
+CleanUp())
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsTransactionItem)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsTransactionItem)
+tmp->CleanUp();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsTransactionItem)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mData)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTransaction)
+if (tmp->mRedoStack) {
+tmp->mRedoStack->DoTraverse(cb);
+}
+if (tmp->mUndoStack) {
+tmp->mUndoStack->DoTraverse(cb);
+}
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsTransactionItem, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsTransactionItem, Release)
+nsresult
+nsTransactionItem::AddChild(nsTransactionItem *aTransactionItem)
+{
+NS_ENSURE_TRUE(aTransactionItem, NS_ERROR_NULL_POINTER);
+if (!mUndoStack) {
+mUndoStack = new nsTransactionStack(nsTransactionStack::FOR_UNDO);
+}
+mUndoStack->Push(aTransactionItem);
+return NS_OK;
+}
+already_AddRefed<nsITransaction>
+nsTransactionItem::GetTransaction()
+{
+nsCOMPtr<nsITransaction> txn = mTransaction;
+return txn.forget();
+}
+nsresult
+nsTransactionItem::GetIsBatch(bool *aIsBatch)
+{
+NS_ENSURE_TRUE(aIsBatch, NS_ERROR_NULL_POINTER);
+*aIsBatch = !mTransaction;
+return NS_OK;
+}
+nsresult
+nsTransactionItem::GetNumberOfChildren(int32_t *aNumChildren)
+{
+nsresult result;
+NS_ENSURE_TRUE(aNumChildren, NS_ERROR_NULL_POINTER);
+*aNumChildren = 0;
+int32_t ui = 0;
+int32_t ri = 0;
+result = GetNumberOfUndoItems(&ui);
+NS_ENSURE_SUCCESS(result, result);
+result = GetNumberOfRedoItems(&ri);
+NS_ENSURE_SUCCESS(result, result);
+*aNumChildren = ui + ri;
+return NS_OK;
+}
+nsresult
+nsTransactionItem::GetChild(int32_t aIndex, nsTransactionItem **aChild)
+{
+NS_ENSURE_TRUE(aChild, NS_ERROR_NULL_POINTER);
+*aChild = 0;
+int32_t numItems = 0;
+nsresult result = GetNumberOfChildren(&numItems);
+NS_ENSURE_SUCCESS(result, result);
+if (aIndex < 0 || aIndex >= numItems)
+return NS_ERROR_FAILURE;
+// Children are expected to be in the order they were added,
+// so the child first added would be at the bottom of the undo
+// stack, or if there are no items on the undo stack, it would
+// be at the top of the redo stack.
+result = GetNumberOfUndoItems(&numItems);
+NS_ENSURE_SUCCESS(result, result);
+if (numItems > 0 && aIndex < numItems) {
+NS_ENSURE_TRUE(mUndoStack, NS_ERROR_FAILURE);
+nsRefPtr<nsTransactionItem> child = mUndoStack->GetItem(aIndex);
+child.forget(aChild);
+return *aChild ? NS_OK : NS_ERROR_FAILURE;
+}
+// Adjust the index for the redo stack:
+aIndex -=  numItems;
+result = GetNumberOfRedoItems(&numItems);
+NS_ENSURE_SUCCESS(result, result);
+NS_ENSURE_TRUE(mRedoStack && numItems != 0 && aIndex < numItems, NS_ERROR_FAILURE);
+nsRefPtr<nsTransactionItem> child = mRedoStack->GetItem(aIndex);
+child.forget(aChild);
+return *aChild ? NS_OK : NS_ERROR_FAILURE;
+}
+nsresult
+nsTransactionItem::DoTransaction()
+{
+if (mTransaction)
+return mTransaction->DoTransaction();
+return NS_OK;
+}
+nsresult
+nsTransactionItem::UndoTransaction(nsTransactionManager *aTxMgr)
+{
+nsresult result = UndoChildren(aTxMgr);
+if (NS_FAILED(result)) {
+RecoverFromUndoError(aTxMgr);
+return result;
+}
+if (!mTransaction)
+return NS_OK;
+result = mTransaction->UndoTransaction();
+if (NS_FAILED(result)) {
+RecoverFromUndoError(aTxMgr);
+return result;
+}
+return NS_OK;
+}
+nsresult
+nsTransactionItem::UndoChildren(nsTransactionManager *aTxMgr)
+{
+nsRefPtr<nsTransactionItem> item;
+nsresult result = NS_OK;
+int32_t sz = 0;
+if (mUndoStack) {
+if (!mRedoStack && mUndoStack) {
+mRedoStack = new nsTransactionStack(nsTransactionStack::FOR_REDO);
+}
+/* Undo all of the transaction items children! */
+sz = mUndoStack->GetSize();
+while (sz-- > 0) {
+item = mUndoStack->Peek();
+if (!item) {
+return NS_ERROR_FAILURE;
+}
+nsCOMPtr<nsITransaction> t = item->GetTransaction();
+bool doInterrupt = false;
+result = aTxMgr->WillUndoNotify(t, &doInterrupt);
+if (NS_FAILED(result)) {
+return result;
+}
+if (doInterrupt) {
+return NS_OK;
+}
+result = item->UndoTransaction(aTxMgr);
+if (NS_SUCCEEDED(result)) {
+item = mUndoStack->Pop();
+mRedoStack->Push(item);
+}
+nsresult result2 = aTxMgr->DidUndoNotify(t, result);
+if (NS_SUCCEEDED(result)) {
+result = result2;
+}
+}
+}
+return result;
+}
+nsresult
+nsTransactionItem::RedoTransaction(nsTransactionManager *aTxMgr)
+{
+nsresult result;
+nsCOMPtr<nsITransaction> kungfuDeathGrip(mTransaction);
+if (mTransaction) {
+result = mTransaction->RedoTransaction();
+NS_ENSURE_SUCCESS(result, result);
+}
+result = RedoChildren(aTxMgr);
+if (NS_FAILED(result)) {
+RecoverFromRedoError(aTxMgr);
+return result;
+}
+return NS_OK;
+}
+nsresult
+nsTransactionItem::RedoChildren(nsTransactionManager *aTxMgr)
+{
+nsRefPtr<nsTransactionItem> item;
+nsresult result = NS_OK;
+if (!mRedoStack)
+return NS_OK;
+/* Redo all of the transaction items children! */
+int32_t sz = mRedoStack->GetSize();
+while (sz-- > 0) {
+item = mRedoStack->Peek();
+if (!item) {
+return NS_ERROR_FAILURE;
+}
+nsCOMPtr<nsITransaction> t = item->GetTransaction();
+bool doInterrupt = false;
+result = aTxMgr->WillRedoNotify(t, &doInterrupt);
+if (NS_FAILED(result)) {
+return result;
+}
+if (doInterrupt) {
+return NS_OK;
+}
+result = item->RedoTransaction(aTxMgr);
+if (NS_SUCCEEDED(result)) {
+item = mRedoStack->Pop();
+mUndoStack->Push(item);
+}
+nsresult result2 = aTxMgr->DidUndoNotify(t, result);
+if (NS_SUCCEEDED(result)) {
+result = result2;
+}
+}
+return result;
+}
+nsresult
+nsTransactionItem::GetNumberOfUndoItems(int32_t *aNumItems)
+{
+NS_ENSURE_TRUE(aNumItems, NS_ERROR_NULL_POINTER);
+if (!mUndoStack) {
+*aNumItems = 0;
+return NS_OK;
+}
+*aNumItems = mUndoStack->GetSize();
+return *aNumItems ? NS_OK : NS_ERROR_FAILURE;
+}
+nsresult
+nsTransactionItem::GetNumberOfRedoItems(int32_t *aNumItems)
+{
+NS_ENSURE_TRUE(aNumItems, NS_ERROR_NULL_POINTER);
+if (!mRedoStack) {
+*aNumItems = 0;
+return NS_OK;
+}
+*aNumItems = mRedoStack->GetSize();
+return *aNumItems ? NS_OK : NS_ERROR_FAILURE;
+}
+nsresult
+nsTransactionItem::RecoverFromUndoError(nsTransactionManager *aTxMgr)
+{
+//
+// If this method gets called, we never got to the point where we
+// successfully called UndoTransaction() for the transaction item itself.
+// Just redo any children that successfully called undo!
+//
+return RedoChildren(aTxMgr);
+}
+nsresult
+nsTransactionItem::RecoverFromRedoError(nsTransactionManager *aTxMgr)
+{
+//
+// If this method gets called, we already successfully called
+// RedoTransaction() for the transaction item itself. Undo all
+// the children that successfully called RedoTransaction(),
+// then undo the transaction item itself.
+//
+nsresult result;
+result = UndoChildren(aTxMgr);
+if (NS_FAILED(result)) {
+return result;
+}
+if (!mTransaction)
+return NS_OK;
+return mTransaction->UndoTransaction();
+}

The Tor Browser / file comparison

comparison: editor/txmgr/src/nsTransactionItem.cpp

editor/txmgr/src/nsTransactionItem.cpp