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gecko-dev/dom/html/UndoManager.cpp

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31 KiB
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/dom/UndoManager.h"
#include "mozilla/dom/DOMTransactionBinding.h"
#include "mozilla/dom/Event.h"
#include "nsDOMClassInfoID.h"
#include "nsIClassInfo.h"
#include "nsIDOMDocument.h"
#include "nsIXPCScriptable.h"
#include "nsIVariant.h"
#include "nsVariant.h"
#include "nsINode.h"
#include "mozilla/dom/DOMTransactionEvent.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsContentUtils.h"
#include "jsapi.h"
#include "nsIDocument.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/Preferences.h"
// Includes for mutation observer.
#include "nsIDOMHTMLElement.h"
#include "nsStubMutationObserver.h"
#include "nsAutoPtr.h"
#include "nsTransactionManager.h"
// Includes for attribute changed transaction.
#include "nsITransaction.h"
#include "nsIContent.h"
#include "nsIDOMMutationEvent.h"
#include "mozilla/dom/Element.h"
// Includes for text content changed.
#include "nsTextFragment.h"
using namespace mozilla;
using namespace mozilla::dom;
/////////////////////////////////////////////////
// UndoTxn
/////////////////////////////////////////////////
/**
* A base class to implement methods that behave the same for all
* UndoManager transactions.
*/
class UndoTxn : public nsITransaction {
NS_DECL_NSITRANSACTION
protected:
virtual ~UndoTxn() {}
};
NS_IMETHODIMP
UndoTxn::DoTransaction()
{
// Do not do anything the first time we apply this transaction,
// changes should already have been applied.
return NS_OK;
}
NS_IMETHODIMP
UndoTxn::RedoTransaction()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
UndoTxn::UndoTransaction()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
UndoTxn::GetIsTransient(bool* aIsTransient)
{
*aIsTransient = false;
return NS_OK;
}
NS_IMETHODIMP
UndoTxn::Merge(nsITransaction* aTransaction, bool* aResult)
{
*aResult = false;
return NS_OK;
}
/////////////////////////////////////////////////
// UndoAttrChanged
/////////////////////////////////////////////////
/**
* Transaction to handle an attribute change to a nsIContent.
*/
class UndoAttrChanged : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(UndoAttrChanged)
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD UndoTransaction() override;
nsresult Init();
UndoAttrChanged(mozilla::dom::Element* aElement, int32_t aNameSpaceID,
nsIAtom* aAttribute, int32_t aModType);
protected:
~UndoAttrChanged() {}
nsresult SaveRedoState();
nsCOMPtr<nsIContent> mElement;
int32_t mNameSpaceID;
nsCOMPtr<nsIAtom> mAttrAtom;
int32_t mModType;
nsString mRedoValue;
nsString mUndoValue;
};
NS_IMPL_CYCLE_COLLECTION(UndoAttrChanged, mElement, mAttrAtom)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoAttrChanged)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoAttrChanged)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoAttrChanged)
UndoAttrChanged::UndoAttrChanged(mozilla::dom::Element* aElement,
int32_t aNameSpaceID, nsIAtom* aAttribute,
int32_t aModType)
: mElement(aElement), mNameSpaceID(aNameSpaceID), mAttrAtom(aAttribute),
mModType(aModType) {}
nsresult
UndoAttrChanged::SaveRedoState()
{
mElement->GetAttr(mNameSpaceID, mAttrAtom, mRedoValue);
return NS_OK;
}
nsresult
UndoAttrChanged::Init()
{
mElement->GetAttr(mNameSpaceID, mAttrAtom, mUndoValue);
return NS_OK;
}
NS_IMETHODIMP
UndoAttrChanged::UndoTransaction()
{
nsresult rv = SaveRedoState();
NS_ENSURE_SUCCESS(rv, rv);
switch (mModType) {
case nsIDOMMutationEvent::MODIFICATION:
mElement->SetAttr(mNameSpaceID, mAttrAtom, mUndoValue, true);
return NS_OK;
case nsIDOMMutationEvent::ADDITION:
mElement->UnsetAttr(mNameSpaceID, mAttrAtom, true);
return NS_OK;
case nsIDOMMutationEvent::REMOVAL:
if (!mElement->HasAttr(mNameSpaceID, mAttrAtom)) {
mElement->SetAttr(mNameSpaceID, mAttrAtom, mUndoValue, true);
}
return NS_OK;
}
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
UndoAttrChanged::RedoTransaction()
{
switch (mModType) {
case nsIDOMMutationEvent::MODIFICATION:
mElement->SetAttr(mNameSpaceID, mAttrAtom, mRedoValue, true);
return NS_OK;
case nsIDOMMutationEvent::ADDITION:
if (!mElement->HasAttr(mNameSpaceID, mAttrAtom)) {
mElement->SetAttr(mNameSpaceID, mAttrAtom, mRedoValue, true);
}
return NS_OK;
case nsIDOMMutationEvent::REMOVAL:
mElement->UnsetAttr(mNameSpaceID, mAttrAtom, true);
return NS_OK;
}
return NS_ERROR_UNEXPECTED;
}
/////////////////////////////////////////////////
// UndoTextChanged
/////////////////////////////////////////////////
struct UndoCharacterChangedData {
bool mAppend;
uint32_t mChangeStart;
uint32_t mChangeEnd;
uint32_t mReplaceLength;
explicit UndoCharacterChangedData(CharacterDataChangeInfo* aChange)
: mAppend(aChange->mAppend), mChangeStart(aChange->mChangeStart),
mChangeEnd(aChange->mChangeEnd),
mReplaceLength(aChange->mReplaceLength) {}
};
/**
* Transaction to handle a text change to a nsIContent.
*/
class UndoTextChanged : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(UndoTextChanged)
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD UndoTransaction() override;
UndoTextChanged(nsIContent* aContent,
CharacterDataChangeInfo* aChange);
protected:
~UndoTextChanged() {}
void SaveRedoState();
nsCOMPtr<nsIContent> mContent;
UndoCharacterChangedData mChange;
nsString mRedoValue;
nsString mUndoValue;
};
NS_IMPL_CYCLE_COLLECTION(UndoTextChanged, mContent)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoTextChanged)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoTextChanged)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoTextChanged)
UndoTextChanged::UndoTextChanged(nsIContent* aContent,
CharacterDataChangeInfo* aChange)
: mContent(aContent), mChange(aChange)
{
const nsTextFragment* text = mContent->GetText();
int32_t numReplaced = mChange.mChangeEnd - mChange.mChangeStart;
text->AppendTo(mUndoValue, mChange.mChangeStart, numReplaced);
}
nsresult
UndoTextChanged::RedoTransaction()
{
nsAutoString text;
mContent->AppendTextTo(text);
if (text.Length() < mChange.mChangeStart) {
return NS_OK;
}
if (mChange.mAppend) {
// Text length should match the change start unless there was a
// mutation exterior to the UndoManager in which case we do nothing.
if (text.Length() == mChange.mChangeStart) {
mContent->AppendText(mRedoValue.get(), mRedoValue.Length(), true);
}
} else {
int32_t numReplaced = mChange.mChangeEnd - mChange.mChangeStart;
// The length of the text should be at least as long as the replacement
// offset + replaced length, otherwise there was an external mutation.
if (mChange.mChangeStart + numReplaced <= text.Length()) {
text.Replace(mChange.mChangeStart, numReplaced, mRedoValue);
mContent->SetText(text, true);
}
}
return NS_OK;
}
nsresult
UndoTextChanged::UndoTransaction()
{
SaveRedoState();
nsAutoString text;
mContent->AppendTextTo(text);
if (text.Length() < mChange.mChangeStart) {
return NS_OK;
}
if (mChange.mAppend) {
// The text should at least as long as the redo value in the case
// of an append, otherwise there was an external mutation.
if (mRedoValue.Length() <= text.Length()) {
text.Truncate(text.Length() - mRedoValue.Length());
}
} else {
// The length of the text should be at least as long as the replacement
// offset + replacement length, otherwise there was an external mutation.
if (mChange.mChangeStart + mChange.mReplaceLength <= text.Length()) {
text.Replace(mChange.mChangeStart, mChange.mReplaceLength, mUndoValue);
}
}
mContent->SetText(text, true);
return NS_OK;
}
void
UndoTextChanged::SaveRedoState()
{
const nsTextFragment* text = mContent->GetText();
mRedoValue.Truncate();
// The length of the text should be at least as long as the replacement
// offset + replacement length, otherwise there was an external mutation.
if (mChange.mChangeStart + mChange.mReplaceLength <= text->GetLength()) {
text->AppendTo(mRedoValue, mChange.mChangeStart, mChange.mReplaceLength);
}
}
/////////////////////////////////////////////////
// UndoContentAppend
/////////////////////////////////////////////////
/**
* Transaction to handle appending content to a nsIContent.
*/
class UndoContentAppend : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(UndoContentAppend)
nsresult Init(int32_t aFirstIndex);
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD UndoTransaction() override;
explicit UndoContentAppend(nsIContent* aContent);
protected:
~UndoContentAppend() {}
nsCOMPtr<nsIContent> mContent;
nsCOMArray<nsIContent> mChildren;
};
NS_IMPL_CYCLE_COLLECTION(UndoContentAppend, mContent, mChildren)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoContentAppend)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoContentAppend)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoContentAppend)
UndoContentAppend::UndoContentAppend(nsIContent* aContent)
{
mContent = aContent;
}
nsresult
UndoContentAppend::Init(int32_t aFirstIndex)
{
for (uint32_t i = aFirstIndex; i < mContent->GetChildCount(); i++) {
NS_ENSURE_TRUE(mChildren.AppendObject(mContent->GetChildAt(i)),
NS_ERROR_OUT_OF_MEMORY);
}
return NS_OK;
}
nsresult
UndoContentAppend::RedoTransaction()
{
for (int32_t i = 0; i < mChildren.Count(); i++) {
if (!mChildren[i]->GetParentNode()) {
mContent->AppendChildTo(mChildren[i], true);
}
}
return NS_OK;
}
nsresult
UndoContentAppend::UndoTransaction()
{
for (int32_t i = mChildren.Count() - 1; i >= 0; i--) {
if (mChildren[i]->GetParentNode() == mContent) {
IgnoredErrorResult error;
mContent->RemoveChild(*mChildren[i], error);
}
}
return NS_OK;
}
/////////////////////////////////////////////////
// UndoContentInsert
/////////////////////////////////////////////////
/**
* Transaction to handle inserting content into a nsIContent.
*/
class UndoContentInsert : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(UndoContentInsert)
NS_IMETHOD UndoTransaction() override;
NS_IMETHOD RedoTransaction() override;
UndoContentInsert(nsIContent* aContent, nsIContent* aChild,
int32_t aInsertIndex);
protected:
~UndoContentInsert() {}
nsCOMPtr<nsIContent> mContent;
nsCOMPtr<nsIContent> mChild;
nsCOMPtr<nsIContent> mNextNode;
};
NS_IMPL_CYCLE_COLLECTION(UndoContentInsert, mContent, mChild, mNextNode)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoContentInsert)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoContentInsert)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoContentInsert)
UndoContentInsert::UndoContentInsert(nsIContent* aContent,
nsIContent* aChild,
int32_t aInsertIndex)
: mContent(aContent), mChild(aChild)
{
mNextNode = mContent->GetChildAt(aInsertIndex + 1);
}
nsresult
UndoContentInsert::RedoTransaction()
{
if (!mChild) {
return NS_ERROR_UNEXPECTED;
}
// Check if node already has parent.
if (mChild->GetParentNode()) {
return NS_OK;
}
// Check to see if next sibling has same parent.
if (mNextNode && mNextNode->GetParentNode() != mContent) {
return NS_OK;
}
IgnoredErrorResult error;
mContent->InsertBefore(*mChild, mNextNode, error);
return NS_OK;
}
nsresult
UndoContentInsert::UndoTransaction()
{
if (!mChild) {
return NS_ERROR_UNEXPECTED;
}
// Check if the parent is the same.
if (mChild->GetParentNode() != mContent) {
return NS_OK;
}
// Check of the parent of the next node is the same.
if (mNextNode && mNextNode->GetParentNode() != mContent) {
return NS_OK;
}
// Check that the next node has not changed.
if (mChild->GetNextSibling() != mNextNode) {
return NS_OK;
}
IgnoredErrorResult error;
mContent->RemoveChild(*mChild, error);
return NS_OK;
}
/////////////////////////////////////////////////
// UndoContentRemove
/////////////////////////////////////////////////
/**
* Transaction to handle removing content from an nsIContent.
*/
class UndoContentRemove : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(UndoContentRemove)
NS_IMETHOD UndoTransaction() override;
NS_IMETHOD RedoTransaction() override;
nsresult Init(int32_t aInsertIndex);
UndoContentRemove(nsIContent* aContent, nsIContent* aChild,
int32_t aInsertIndex);
protected:
~UndoContentRemove() {}
nsCOMPtr<nsIContent> mContent;
nsCOMPtr<nsIContent> mChild;
nsCOMPtr<nsIContent> mNextNode;
};
NS_IMPL_CYCLE_COLLECTION(UndoContentRemove, mContent, mChild, mNextNode)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoContentRemove)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoContentRemove)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoContentRemove)
nsresult
UndoContentRemove::Init(int32_t aInsertIndex)
{
return NS_OK;
}
UndoContentRemove::UndoContentRemove(nsIContent* aContent, nsIContent* aChild,
int32_t aInsertIndex)
: mContent(aContent), mChild(aChild)
{
mNextNode = mContent->GetChildAt(aInsertIndex);
}
nsresult
UndoContentRemove::UndoTransaction()
{
if (!mChild) {
return NS_ERROR_UNEXPECTED;
}
// Check if child has a parent.
if (mChild->GetParentNode()) {
return NS_OK;
}
// Make sure next sibling is still under same parent.
if (mNextNode && mNextNode->GetParentNode() != mContent) {
return NS_OK;
}
IgnoredErrorResult error;
mContent->InsertBefore(*mChild, mNextNode, error);
return NS_OK;
}
nsresult
UndoContentRemove::RedoTransaction()
{
if (!mChild) {
return NS_ERROR_UNEXPECTED;
}
// Check that the parent has not changed.
if (mChild->GetParentNode() != mContent) {
return NS_OK;
}
// Check that the next node still has the same parent.
if (mNextNode && mNextNode->GetParentNode() != mContent) {
return NS_OK;
}
// Check that the next sibling has not changed.
if (mChild->GetNextSibling() != mNextNode) {
return NS_OK;
}
IgnoredErrorResult error;
mContent->RemoveChild(*mChild, error);
return NS_OK;
}
/////////////////////////////////////////////////
// UndoMutationObserver
/////////////////////////////////////////////////
/**
* Watches for DOM mutations in a particular element and its
* descendants to create transactions that undo and redo
* the mutations. Each UndoMutationObserver corresponds
* to an undo scope.
*/
class UndoMutationObserver : public nsStubMutationObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
explicit UndoMutationObserver(nsITransactionManager* aTxnManager);
protected:
/**
* Checks if |aContent| is within the undo scope of this
* UndoMutationObserver.
*/
bool IsManagerForMutation(nsIContent* aContent);
virtual ~UndoMutationObserver() {}
nsITransactionManager* mTxnManager; // [RawPtr] UndoManager holds strong
// reference.
};
NS_IMPL_ISUPPORTS(UndoMutationObserver, nsIMutationObserver)
bool
UndoMutationObserver::IsManagerForMutation(nsIContent* aContent)
{
nsCOMPtr<nsINode> currentNode = aContent;
RefPtr<UndoManager> undoManager;
// Get the UndoManager of nearest ancestor with an UndoManager.
while (currentNode && !undoManager) {
nsCOMPtr<Element> htmlElem = do_QueryInterface(currentNode);
if (htmlElem) {
undoManager = htmlElem->GetUndoManager();
}
currentNode = currentNode->GetParentNode();
}
if (!undoManager) {
// Check against document UndoManager if we were unable to find an
// UndoManager in an ancestor element.
nsIDocument* doc = aContent->OwnerDoc();
NS_ENSURE_TRUE(doc, false);
undoManager = doc->GetUndoManager();
// The document will not have an undoManager if the
// documentElement is removed.
NS_ENSURE_TRUE(undoManager, false);
}
// Check if the nsITransactionManager is the same for both the
// mutation observer and the nsIContent.
return undoManager->GetTransactionManager() == mTxnManager;
}
UndoMutationObserver::UndoMutationObserver(nsITransactionManager* aTxnManager)
: mTxnManager(aTxnManager) {}
void
UndoMutationObserver::AttributeWillChange(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue)
{
if (!IsManagerForMutation(aElement)) {
return;
}
RefPtr<UndoAttrChanged> undoTxn = new UndoAttrChanged(aElement,
aNameSpaceID,
aAttribute,
aModType);
if (NS_SUCCEEDED(undoTxn->Init())) {
mTxnManager->DoTransaction(undoTxn);
}
}
void
UndoMutationObserver::CharacterDataWillChange(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
if (!IsManagerForMutation(aContent)) {
return;
}
RefPtr<UndoTextChanged> undoTxn = new UndoTextChanged(aContent, aInfo);
mTxnManager->DoTransaction(undoTxn);
}
void
UndoMutationObserver::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
if (!IsManagerForMutation(aContainer)) {
return;
}
RefPtr<UndoContentAppend> txn = new UndoContentAppend(aContainer);
if (NS_SUCCEEDED(txn->Init(aNewIndexInContainer))) {
mTxnManager->DoTransaction(txn);
}
}
void
UndoMutationObserver::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
if (!IsManagerForMutation(aContainer)) {
return;
}
RefPtr<UndoContentInsert> txn = new UndoContentInsert(aContainer, aChild,
aIndexInContainer);
mTxnManager->DoTransaction(txn);
}
void
UndoMutationObserver::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
if (!IsManagerForMutation(aContainer)) {
return;
}
RefPtr<UndoContentRemove> txn = new UndoContentRemove(aContainer, aChild,
aIndexInContainer);
mTxnManager->DoTransaction(txn);
}
/////////////////////////////////////////////////
// FunctionCallTxn
/////////////////////////////////////////////////
/**
* A transaction that calls members on the transaction
* object.
*/
class FunctionCallTxn : public UndoTxn {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(FunctionCallTxn)
// Flags
static const uint32_t CALL_ON_REDO = 1;
static const uint32_t CALL_ON_UNDO = 2;
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD UndoTransaction() override;
FunctionCallTxn(DOMTransaction* aTransaction, uint32_t aFlags);
protected:
~FunctionCallTxn() {}
/**
* Call a function member on the transaction object with the
* specified function name.
*/
RefPtr<DOMTransaction> mTransaction;
uint32_t mFlags;
};
NS_IMPL_CYCLE_COLLECTION(FunctionCallTxn, mTransaction)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FunctionCallTxn)
NS_INTERFACE_MAP_ENTRY(nsITransaction)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(FunctionCallTxn)
NS_IMPL_CYCLE_COLLECTING_RELEASE(FunctionCallTxn)
FunctionCallTxn::FunctionCallTxn(DOMTransaction* aTransaction,
uint32_t aFlags)
: mTransaction(aTransaction), mFlags(aFlags) {}
nsresult
FunctionCallTxn::RedoTransaction()
{
if (!(mFlags & CALL_ON_REDO)) {
return NS_OK;
}
// We ignore rv because we want to avoid the rollback behavior of the
// nsITransactionManager.
IgnoredErrorResult rv;
RefPtr<DOMTransactionCallback> redo = mTransaction->GetRedo(rv);
if (!rv.Failed() && redo) {
redo->Call(mTransaction.get(), rv);
}
return NS_OK;
}
nsresult
FunctionCallTxn::UndoTransaction()
{
if (!(mFlags & CALL_ON_UNDO)) {
return NS_OK;
}
// We ignore rv because we want to avoid the rollback behavior of the
// nsITransactionManager.
IgnoredErrorResult rv;
RefPtr<DOMTransactionCallback> undo = mTransaction->GetUndo(rv);
if (!rv.Failed() && undo) {
undo->Call(mTransaction.get(), rv);
}
return NS_OK;
}
/////////////////////////////////////////////////
// TxnScopeGuard
/////////////////////////////////////////////////
namespace mozilla {
namespace dom {
class TxnScopeGuard {
public:
explicit TxnScopeGuard(UndoManager* aUndoManager)
: mUndoManager(aUndoManager)
{
mUndoManager->mInTransaction = true;
}
~TxnScopeGuard()
{
mUndoManager->mInTransaction = false;
}
protected:
UndoManager* mUndoManager;
};
} // namespace dom
} // namespace mozilla
/////////////////////////////////////////////////
// UndoManager
/////////////////////////////////////////////////
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(UndoManager, mTxnManager, mHostNode)
NS_IMPL_CYCLE_COLLECTING_ADDREF(UndoManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(UndoManager)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UndoManager)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
UndoManager::UndoManager(nsIContent* aNode)
: mHostNode(aNode), mInTransaction(false), mIsDisconnected(false)
{
mTxnManager = new nsTransactionManager();
}
UndoManager::~UndoManager() {}
void
UndoManager::Transact(JSContext* aCx, DOMTransaction& aTransaction,
bool aMerge, ErrorResult& aRv)
{
if (mIsDisconnected || mInTransaction) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return;
}
TxnScopeGuard guard(this);
// First try executing an automatic transaction.
RefPtr<DOMTransactionCallback> executeAutomatic =
aTransaction.GetExecuteAutomatic(aRv);
if (aRv.Failed()) {
return;
}
if (executeAutomatic) {
AutomaticTransact(&aTransaction, executeAutomatic, aRv);
} else {
ManualTransact(&aTransaction, aRv);
}
if (aRv.Failed()) {
return;
}
if (aMerge) {
nsresult rv = mTxnManager->BatchTopUndo();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
}
DispatchTransactionEvent(aCx, NS_LITERAL_STRING("DOMTransaction"), 0, aRv);
if (aRv.Failed()) {
return;
}
}
void
UndoManager::AutomaticTransact(DOMTransaction* aTransaction,
DOMTransactionCallback* aCallback,
ErrorResult& aRv)
{
MOZ_ASSERT(aCallback);
nsCOMPtr<nsIMutationObserver> mutationObserver =
new UndoMutationObserver(mTxnManager);
// Transaction to call the "undo" method after the automatic transaction
// has been undone.
RefPtr<FunctionCallTxn> undoTxn = new FunctionCallTxn(aTransaction,
FunctionCallTxn::CALL_ON_UNDO);
// Transaction to call the "redo" method after the automatic transaction
// has been redone.
RefPtr<FunctionCallTxn> redoTxn = new FunctionCallTxn(aTransaction,
FunctionCallTxn::CALL_ON_REDO);
mTxnManager->BeginBatch(aTransaction);
mTxnManager->DoTransaction(undoTxn);
mHostNode->AddMutationObserver(mutationObserver);
aCallback->Call(aTransaction, aRv);
mHostNode->RemoveMutationObserver(mutationObserver);
mTxnManager->DoTransaction(redoTxn);
mTxnManager->EndBatch(true);
if (aRv.Failed()) {
mTxnManager->RemoveTopUndo();
}
}
void
UndoManager::ManualTransact(DOMTransaction* aTransaction,
ErrorResult& aRv)
{
RefPtr<FunctionCallTxn> txn = new FunctionCallTxn(aTransaction,
FunctionCallTxn::CALL_ON_REDO | FunctionCallTxn::CALL_ON_UNDO);
RefPtr<DOMTransactionCallback> execute = aTransaction->GetExecute(aRv);
if (!aRv.Failed() && execute) {
execute->Call(aTransaction, aRv);
}
if (aRv.Failed()) {
return;
}
mTxnManager->BeginBatch(aTransaction);
mTxnManager->DoTransaction(txn);
mTxnManager->EndBatch(true);
}
uint32_t
UndoManager::GetPosition(ErrorResult& aRv)
{
int32_t numRedo;
nsresult rv = mTxnManager->GetNumberOfRedoItems(&numRedo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return 0;
}
MOZ_ASSERT(numRedo >= 0, "Number of redo items should not be negative");
return numRedo;
}
uint32_t
UndoManager::GetLength(ErrorResult& aRv)
{
int32_t numRedo;
nsresult rv = mTxnManager->GetNumberOfRedoItems(&numRedo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return 0;
}
int32_t numUndo;
rv = mTxnManager->GetNumberOfUndoItems(&numUndo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return 0;
}
return numRedo + numUndo;
}
void
UndoManager::ItemInternal(uint32_t aIndex,
nsTArray<DOMTransaction*>& aItems,
ErrorResult& aRv)
{
int32_t numRedo;
nsresult rv = mTxnManager->GetNumberOfRedoItems(&numRedo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
MOZ_ASSERT(numRedo >= 0, "Number of redo items should not be negative");
int32_t numUndo;
rv = mTxnManager->GetNumberOfUndoItems(&numUndo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
MOZ_ASSERT(numUndo >= 0, "Number of undo items should not be negative");
MOZ_ASSERT(aIndex < (uint32_t) numRedo + numUndo,
"Index should be within bounds.");
nsCOMPtr<nsITransactionList> txnList;
int32_t listIndex = aIndex;
if (aIndex < (uint32_t) numRedo) {
// Index is an redo.
mTxnManager->GetRedoList(getter_AddRefs(txnList));
} else {
// Index is a undo.
mTxnManager->GetUndoList(getter_AddRefs(txnList));
// We need to adjust the index because the undo list indices will
// be in the reverse order.
listIndex = numRedo + numUndo - aIndex - 1;
}
// Obtain data from transaction list and convert to list of
// DOMTransaction*.
nsISupports** listData;
uint32_t listDataLength;
rv = txnList->GetData(listIndex, &listDataLength, &listData);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
for (uint32_t i = 0; i < listDataLength; i++) {
aItems.AppendElement(static_cast<DOMTransaction*>(listData[i]));
NS_RELEASE(listData[i]);
}
free(listData);
}
void
UndoManager::Item(uint32_t aIndex,
Nullable<nsTArray<RefPtr<DOMTransaction> > >& aItems,
ErrorResult& aRv)
{
int32_t numRedo;
nsresult rv = mTxnManager->GetNumberOfRedoItems(&numRedo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
MOZ_ASSERT(numRedo >= 0, "Number of redo items should not be negative");
int32_t numUndo;
rv = mTxnManager->GetNumberOfUndoItems(&numUndo);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
MOZ_ASSERT(numUndo >= 0, "Number of undo items should not be negative");
if (aIndex >= (uint32_t) numRedo + numUndo) {
// If the index is out of bounds, then return null.
aItems.SetNull();
return;
}
nsTArray<DOMTransaction*> transactions;
ItemInternal(aIndex, transactions, aRv);
if (aRv.Failed()) {
return;
}
nsTArray<RefPtr<DOMTransaction> >& items = aItems.SetValue();
for (uint32_t i = 0; i < transactions.Length(); i++) {
items.AppendElement(transactions[i]);
}
}
void
UndoManager::Undo(JSContext* aCx, ErrorResult& aRv)
{
if (mIsDisconnected || mInTransaction) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return;
}
uint32_t position = GetPosition(aRv);
if (aRv.Failed()) {
return;
}
uint32_t length = GetLength(aRv);
if (aRv.Failed()) {
return;
}
// Stop if there are no transactions left to undo.
if (position >= length) {
return;
}
TxnScopeGuard guard(this);
nsresult rv = mTxnManager->UndoTransaction();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
DispatchTransactionEvent(aCx, NS_LITERAL_STRING("undo"), position, aRv);
if (aRv.Failed()) {
return;
}
}
void
UndoManager::Redo(JSContext* aCx, ErrorResult& aRv)
{
if (mIsDisconnected || mInTransaction) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return;
}
uint32_t position = GetPosition(aRv);
if (aRv.Failed()) {
return;
}
// Stop if there are no transactions left to redo.
if (position <= 0) {
return;
}
TxnScopeGuard guard(this);
nsresult rv = mTxnManager->RedoTransaction();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
DispatchTransactionEvent(aCx, NS_LITERAL_STRING("redo"), position - 1, aRv);
if (aRv.Failed()) {
return;
}
}
void
UndoManager::DispatchTransactionEvent(JSContext* aCx, const nsAString& aType,
uint32_t aPreviousPosition,
ErrorResult& aRv)
{
nsTArray<DOMTransaction*> items;
ItemInternal(aPreviousPosition, items, aRv);
if (aRv.Failed()) {
return;
}
JS::Rooted<JS::Value> array(aCx);
if (!ToJSValue(aCx, items, &array)) {
return;
}
RootedDictionary<DOMTransactionEventInit> init(aCx);
init.mBubbles = true;
init.mCancelable = false;
init.mTransactions = array;
RefPtr<DOMTransactionEvent> event =
DOMTransactionEvent::Constructor(mHostNode, aType, init);
event->SetTrusted(true);
EventDispatcher::DispatchDOMEvent(mHostNode, nullptr, event,
nullptr, nullptr);
}
void
UndoManager::ClearUndo(ErrorResult& aRv)
{
if (mIsDisconnected || mInTransaction) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return;
}
nsresult rv = mTxnManager->ClearUndoStack();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
}
void
UndoManager::ClearRedo(ErrorResult& aRv)
{
if (mIsDisconnected || mInTransaction) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return;
}
nsresult rv = mTxnManager->ClearRedoStack();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
}
nsITransactionManager*
UndoManager::GetTransactionManager()
{
return mTxnManager;
}
void
UndoManager::Disconnect()
{
mIsDisconnected = true;
}
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