389 lines
8.2 KiB
C++
389 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "mozilla/mozalloc.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsDebug.h"
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#include "nsError.h"
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#include "nsISupportsImpl.h"
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#include "nsITransaction.h"
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#include "nsTransactionItem.h"
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#include "nsTransactionManager.h"
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#include "nsTransactionStack.h"
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nsTransactionItem::nsTransactionItem(nsITransaction *aTransaction)
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: mTransaction(aTransaction), mUndoStack(0), mRedoStack(0)
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{
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}
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nsTransactionItem::~nsTransactionItem()
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{
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delete mRedoStack;
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delete mUndoStack;
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}
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void
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nsTransactionItem::CleanUp()
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{
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mData.Clear();
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mTransaction = nullptr;
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if (mRedoStack) {
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mRedoStack->DoUnlink();
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}
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if (mUndoStack) {
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mUndoStack->DoUnlink();
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}
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}
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NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(nsTransactionItem)
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NS_IMPL_CYCLE_COLLECTING_NATIVE_RELEASE_WITH_LAST_RELEASE(nsTransactionItem,
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CleanUp())
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NS_IMPL_CYCLE_COLLECTION_CLASS(nsTransactionItem)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsTransactionItem)
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tmp->CleanUp();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsTransactionItem)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mData)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTransaction)
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if (tmp->mRedoStack) {
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tmp->mRedoStack->DoTraverse(cb);
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}
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if (tmp->mUndoStack) {
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tmp->mUndoStack->DoTraverse(cb);
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsTransactionItem, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsTransactionItem, Release)
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nsresult
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nsTransactionItem::AddChild(nsTransactionItem *aTransactionItem)
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{
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NS_ENSURE_TRUE(aTransactionItem, NS_ERROR_NULL_POINTER);
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if (!mUndoStack) {
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mUndoStack = new nsTransactionStack(nsTransactionStack::FOR_UNDO);
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}
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mUndoStack->Push(aTransactionItem);
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return NS_OK;
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}
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already_AddRefed<nsITransaction>
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nsTransactionItem::GetTransaction()
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{
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nsCOMPtr<nsITransaction> txn = mTransaction;
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return txn.forget();
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}
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nsresult
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nsTransactionItem::GetIsBatch(bool *aIsBatch)
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{
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NS_ENSURE_TRUE(aIsBatch, NS_ERROR_NULL_POINTER);
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*aIsBatch = !mTransaction;
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return NS_OK;
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}
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nsresult
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nsTransactionItem::GetNumberOfChildren(int32_t *aNumChildren)
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{
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nsresult result;
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NS_ENSURE_TRUE(aNumChildren, NS_ERROR_NULL_POINTER);
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*aNumChildren = 0;
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int32_t ui = 0;
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int32_t ri = 0;
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result = GetNumberOfUndoItems(&ui);
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NS_ENSURE_SUCCESS(result, result);
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result = GetNumberOfRedoItems(&ri);
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NS_ENSURE_SUCCESS(result, result);
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*aNumChildren = ui + ri;
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return NS_OK;
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}
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nsresult
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nsTransactionItem::GetChild(int32_t aIndex, nsTransactionItem **aChild)
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{
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NS_ENSURE_TRUE(aChild, NS_ERROR_NULL_POINTER);
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*aChild = 0;
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int32_t numItems = 0;
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nsresult result = GetNumberOfChildren(&numItems);
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NS_ENSURE_SUCCESS(result, result);
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if (aIndex < 0 || aIndex >= numItems)
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return NS_ERROR_FAILURE;
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// Children are expected to be in the order they were added,
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// so the child first added would be at the bottom of the undo
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// stack, or if there are no items on the undo stack, it would
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// be at the top of the redo stack.
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result = GetNumberOfUndoItems(&numItems);
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NS_ENSURE_SUCCESS(result, result);
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if (numItems > 0 && aIndex < numItems) {
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NS_ENSURE_TRUE(mUndoStack, NS_ERROR_FAILURE);
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RefPtr<nsTransactionItem> child = mUndoStack->GetItem(aIndex);
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child.forget(aChild);
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return *aChild ? NS_OK : NS_ERROR_FAILURE;
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}
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// Adjust the index for the redo stack:
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aIndex -= numItems;
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result = GetNumberOfRedoItems(&numItems);
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NS_ENSURE_SUCCESS(result, result);
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NS_ENSURE_TRUE(mRedoStack && numItems != 0 && aIndex < numItems, NS_ERROR_FAILURE);
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RefPtr<nsTransactionItem> child = mRedoStack->GetItem(aIndex);
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child.forget(aChild);
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return *aChild ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsTransactionItem::DoTransaction()
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{
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if (mTransaction)
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return mTransaction->DoTransaction();
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return NS_OK;
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}
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nsresult
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nsTransactionItem::UndoTransaction(nsTransactionManager *aTxMgr)
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{
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nsresult result = UndoChildren(aTxMgr);
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if (NS_FAILED(result)) {
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RecoverFromUndoError(aTxMgr);
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return result;
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}
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if (!mTransaction)
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return NS_OK;
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result = mTransaction->UndoTransaction();
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if (NS_FAILED(result)) {
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RecoverFromUndoError(aTxMgr);
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return result;
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}
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return NS_OK;
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}
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nsresult
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nsTransactionItem::UndoChildren(nsTransactionManager *aTxMgr)
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{
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RefPtr<nsTransactionItem> item;
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nsresult result = NS_OK;
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int32_t sz = 0;
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if (mUndoStack) {
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if (!mRedoStack && mUndoStack) {
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mRedoStack = new nsTransactionStack(nsTransactionStack::FOR_REDO);
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}
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/* Undo all of the transaction items children! */
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sz = mUndoStack->GetSize();
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while (sz-- > 0) {
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item = mUndoStack->Peek();
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if (!item) {
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return NS_ERROR_FAILURE;
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}
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nsCOMPtr<nsITransaction> t = item->GetTransaction();
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bool doInterrupt = false;
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result = aTxMgr->WillUndoNotify(t, &doInterrupt);
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if (NS_FAILED(result)) {
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return result;
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}
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if (doInterrupt) {
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return NS_OK;
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}
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result = item->UndoTransaction(aTxMgr);
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if (NS_SUCCEEDED(result)) {
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item = mUndoStack->Pop();
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mRedoStack->Push(item);
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}
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nsresult result2 = aTxMgr->DidUndoNotify(t, result);
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if (NS_SUCCEEDED(result)) {
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result = result2;
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}
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}
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}
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return result;
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}
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nsresult
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nsTransactionItem::RedoTransaction(nsTransactionManager *aTxMgr)
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{
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nsresult result;
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nsCOMPtr<nsITransaction> transaction(mTransaction);
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if (transaction) {
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result = transaction->RedoTransaction();
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NS_ENSURE_SUCCESS(result, result);
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}
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result = RedoChildren(aTxMgr);
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if (NS_FAILED(result)) {
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RecoverFromRedoError(aTxMgr);
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return result;
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}
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return NS_OK;
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}
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nsresult
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nsTransactionItem::RedoChildren(nsTransactionManager *aTxMgr)
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{
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RefPtr<nsTransactionItem> item;
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nsresult result = NS_OK;
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if (!mRedoStack)
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return NS_OK;
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/* Redo all of the transaction items children! */
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int32_t sz = mRedoStack->GetSize();
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while (sz-- > 0) {
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item = mRedoStack->Peek();
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if (!item) {
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return NS_ERROR_FAILURE;
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}
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nsCOMPtr<nsITransaction> t = item->GetTransaction();
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bool doInterrupt = false;
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result = aTxMgr->WillRedoNotify(t, &doInterrupt);
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if (NS_FAILED(result)) {
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return result;
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}
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if (doInterrupt) {
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return NS_OK;
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}
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result = item->RedoTransaction(aTxMgr);
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if (NS_SUCCEEDED(result)) {
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item = mRedoStack->Pop();
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mUndoStack->Push(item);
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}
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nsresult result2 = aTxMgr->DidUndoNotify(t, result);
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if (NS_SUCCEEDED(result)) {
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result = result2;
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}
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}
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return result;
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}
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nsresult
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nsTransactionItem::GetNumberOfUndoItems(int32_t *aNumItems)
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{
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NS_ENSURE_TRUE(aNumItems, NS_ERROR_NULL_POINTER);
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if (!mUndoStack) {
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*aNumItems = 0;
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return NS_OK;
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}
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*aNumItems = mUndoStack->GetSize();
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return *aNumItems ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsTransactionItem::GetNumberOfRedoItems(int32_t *aNumItems)
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{
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NS_ENSURE_TRUE(aNumItems, NS_ERROR_NULL_POINTER);
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if (!mRedoStack) {
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*aNumItems = 0;
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return NS_OK;
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}
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*aNumItems = mRedoStack->GetSize();
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return *aNumItems ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsTransactionItem::RecoverFromUndoError(nsTransactionManager *aTxMgr)
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{
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//
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// If this method gets called, we never got to the point where we
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// successfully called UndoTransaction() for the transaction item itself.
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// Just redo any children that successfully called undo!
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//
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return RedoChildren(aTxMgr);
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}
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nsresult
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nsTransactionItem::RecoverFromRedoError(nsTransactionManager *aTxMgr)
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{
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//
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// If this method gets called, we already successfully called
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// RedoTransaction() for the transaction item itself. Undo all
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// the children that successfully called RedoTransaction(),
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// then undo the transaction item itself.
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//
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nsresult result;
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result = UndoChildren(aTxMgr);
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if (NS_FAILED(result)) {
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return result;
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}
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if (!mTransaction)
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return NS_OK;
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return mTransaction->UndoTransaction();
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}
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