зеркало из https://github.com/mozilla/pjs.git
Added BeginBatch(), EndBatch(), BeginTransaction() and EndTransaction()
methods. Modified Do() method to use Begin/EndTransaction().
This commit is contained in:
kin%netscape.com
Родитель
c280f0ee5d
Коммит
a05e1af615
|
|
@ -82,128 +82,21 @@ nsTransactionManager::QueryInterface(REFNSIID aIID, void** aInstancePtr)
|
|||
nsresult
|
||||
nsTransactionManager::Do(nsITransaction *aTransaction)
|
||||
{
|
||||
nsTransactionItem *tx;
|
||||
nsresult result = NS_OK;
|
||||
nsresult result;
|
||||
|
||||
if (!aTransaction)
|
||||
return NS_ERROR_NULL_POINTER;
|
||||
|
||||
NS_ADDREF(aTransaction);
|
||||
|
||||
// XXX: POSSIBLE OPTIMIZATION
|
||||
// We could use a factory that pre-allocates/recycles transaction items.
|
||||
tx = new nsTransactionItem(aTransaction);
|
||||
|
||||
if (!tx) {
|
||||
NS_RELEASE(aTransaction);
|
||||
return NS_ERROR_OUT_OF_MEMORY;
|
||||
}
|
||||
|
||||
LOCK_TX_MANAGER(this);
|
||||
|
||||
result = mDoStack.Push(tx);
|
||||
result = BeginTransaction(aTransaction);
|
||||
|
||||
if (! NS_SUCCEEDED(result)) {
|
||||
delete tx;
|
||||
if (NS_FAILED(result)) {
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
|
||||
result = tx->Do();
|
||||
|
||||
if (! NS_SUCCEEDED(result)) {
|
||||
mDoStack.Pop(&tx);
|
||||
delete tx;
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
|
||||
mDoStack.Pop(&tx);
|
||||
|
||||
// Check if the transaction is transient. If it is, there's nothing
|
||||
// more to do, just return.
|
||||
|
||||
PRBool isTransient = PR_FALSE;
|
||||
|
||||
result = aTransaction->GetIsTransient(&isTransient);
|
||||
|
||||
if (! NS_SUCCEEDED(result) || isTransient || !mMaxTransactionCount) {
|
||||
delete tx;
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
|
||||
nsTransactionItem *top = 0;
|
||||
|
||||
// Check if there is a transaction on the do stack. If there is,
|
||||
// the current transaction is a "sub" transaction, and should
|
||||
// be added to the transaction at the top of the do stack.
|
||||
|
||||
result = mDoStack.Peek(&top);
|
||||
if (top) {
|
||||
result = top->AddChild(tx);
|
||||
|
||||
// XXX: What do we do if this fails?
|
||||
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
|
||||
// The transaction succeeded, so clear the redo stack.
|
||||
|
||||
result = ClearRedoStack();
|
||||
|
||||
// Check if we can coalesce this transaction with the one at the top
|
||||
// of the undo stack.
|
||||
|
||||
top = 0;
|
||||
result = mUndoStack.Peek(&top);
|
||||
|
||||
if (top) {
|
||||
PRBool didMerge = PR_FALSE;
|
||||
nsITransaction *topTransaction = 0;
|
||||
|
||||
result = top->GetTransaction(&topTransaction);
|
||||
|
||||
if (topTransaction) {
|
||||
result = topTransaction->Merge(&didMerge, aTransaction);
|
||||
|
||||
// XXX: What do we do if this fails?
|
||||
|
||||
if (didMerge) {
|
||||
delete tx;
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Check to see if we've hit the max level of undo. If so,
|
||||
// pop the bottom transaction off the undo stack and release it!
|
||||
|
||||
PRInt32 sz = 0;
|
||||
|
||||
result = mUndoStack.GetSize(&sz);
|
||||
|
||||
if (mMaxTransactionCount > 0 && sz >= mMaxTransactionCount) {
|
||||
nsTransactionItem *overflow = 0;
|
||||
|
||||
result = mUndoStack.PopBottom(&overflow);
|
||||
|
||||
// XXX: What do we do in the case where this fails?
|
||||
|
||||
if (overflow)
|
||||
delete overflow;
|
||||
}
|
||||
|
||||
// Push the transaction on the undo stack:
|
||||
|
||||
result = mUndoStack.Push(tx);
|
||||
|
||||
if (! NS_SUCCEEDED(result)) {
|
||||
// XXX: What do we do in the case where a clear fails?
|
||||
// Remove the transaction from the stack, and release it?
|
||||
}
|
||||
result = EndTransaction();
|
||||
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
|
||||
|
|
@ -333,6 +226,67 @@ nsTransactionManager::Clear()
|
|||
return result;
|
||||
}
|
||||
|
||||
nsresult
|
||||
nsTransactionManager::BeginBatch()
|
||||
{
|
||||
nsresult result;
|
||||
|
||||
// We can batch independent transactions together by simply pushing
|
||||
// a dummy transaction item on the do stack. This dummy transaction item
|
||||
// will be popped off the do stack, and then pushed on the undo stack
|
||||
// in EndBatch().
|
||||
|
||||
LOCK_TX_MANAGER(this);
|
||||
|
||||
result = BeginTransaction(0);
|
||||
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
nsresult
|
||||
nsTransactionManager::EndBatch()
|
||||
{
|
||||
nsTransactionItem *tx = 0;
|
||||
nsITransaction *ti = 0;
|
||||
nsresult result;
|
||||
|
||||
LOCK_TX_MANAGER(this);
|
||||
|
||||
// XXX: Need to add some mechanism to detect the case where the transaction
|
||||
// at the top of the do stack isn't the dummy transaction, so we can
|
||||
// throw an error!! This can happen if someone calls EndBatch() within
|
||||
// the Do() method of a transaction.
|
||||
//
|
||||
// For now, we can detect this case by checking the value of the
|
||||
// dummy transaction's mTransaction field. If it is our dummy
|
||||
// transaction, it should be NULL. This may not be true in the
|
||||
// future when we allow users to execute a transaction when beginning
|
||||
// a batch!!!!
|
||||
|
||||
result = mDoStack.Peek(&tx);
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return result;
|
||||
}
|
||||
|
||||
if (tx)
|
||||
tx->GetTransaction(&ti);
|
||||
|
||||
if (!tx || ti) {
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
return NS_ERROR_FAILURE;
|
||||
}
|
||||
|
||||
result = EndTransaction();
|
||||
|
||||
UNLOCK_TX_MANAGER(this);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
nsresult
|
||||
nsTransactionManager::GetNumberOfUndoItems(PRInt32 *aNumItems)
|
||||
{
|
||||
|
|
@ -568,3 +522,171 @@ nsTransactionManager::ClearRedoStack()
|
|||
return result;
|
||||
}
|
||||
|
||||
nsresult
|
||||
nsTransactionManager::BeginTransaction(nsITransaction *aTransaction)
|
||||
{
|
||||
nsTransactionItem *tx;
|
||||
nsresult result = NS_OK;
|
||||
|
||||
// No need for LOCK/UNLOCK_TX_MANAGER() calls since the calling routine
|
||||
// should have done this already!
|
||||
|
||||
NS_IF_ADDREF(aTransaction);
|
||||
|
||||
// XXX: POSSIBLE OPTIMIZATION
|
||||
// We could use a factory that pre-allocates/recycles transaction items.
|
||||
tx = new nsTransactionItem(aTransaction);
|
||||
|
||||
if (!tx) {
|
||||
NS_IF_RELEASE(aTransaction);
|
||||
return NS_ERROR_OUT_OF_MEMORY;
|
||||
}
|
||||
|
||||
result = mDoStack.Push(tx);
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
delete tx;
|
||||
return result;
|
||||
}
|
||||
|
||||
result = tx->Do();
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
mDoStack.Pop(&tx);
|
||||
delete tx;
|
||||
return result;
|
||||
}
|
||||
|
||||
return NS_OK;
|
||||
}
|
||||
|
||||
nsresult
|
||||
nsTransactionManager::EndTransaction()
|
||||
{
|
||||
nsITransaction *tint = 0;
|
||||
nsTransactionItem *tx = 0;
|
||||
nsresult result = NS_OK;
|
||||
|
||||
// No need for LOCK/UNLOCK_TX_MANAGER() calls since the calling routine
|
||||
// should have done this already!
|
||||
|
||||
result = mDoStack.Pop(&tx);
|
||||
|
||||
if (NS_FAILED(result) || !tx)
|
||||
return result;
|
||||
|
||||
result = tx->GetTransaction(&tint);
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
// XXX: What do we do with the transaction item at this point?
|
||||
return result;
|
||||
}
|
||||
|
||||
if (!tint) {
|
||||
PRInt32 nc = 0;
|
||||
|
||||
// If we get here, the transaction must be a dummy batch transaction
|
||||
// created by BeginBatch(). If it contains no children, get rid of it!
|
||||
|
||||
tx->GetNumberOfChildren(&nc);
|
||||
|
||||
if (!nc) {
|
||||
delete tx;
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
// Check if the transaction is transient. If it is, there's nothing
|
||||
// more to do, just return.
|
||||
|
||||
PRBool isTransient = PR_FALSE;
|
||||
|
||||
if (tint)
|
||||
result = tint->GetIsTransient(&isTransient);
|
||||
|
||||
if (NS_FAILED(result) || isTransient || !mMaxTransactionCount) {
|
||||
// XXX: Should we be clearing the redo stack if the transaction
|
||||
// is transient and there is nothing on the do stack?
|
||||
delete tx;
|
||||
return result;
|
||||
}
|
||||
|
||||
nsTransactionItem *top = 0;
|
||||
|
||||
// Check if there is a transaction on the do stack. If there is,
|
||||
// the current transaction is a "sub" transaction, and should
|
||||
// be added to the transaction at the top of the do stack.
|
||||
|
||||
result = mDoStack.Peek(&top);
|
||||
if (top) {
|
||||
result = top->AddChild(tx);
|
||||
|
||||
// XXX: What do we do if this fails?
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// The transaction succeeded, so clear the redo stack.
|
||||
|
||||
result = ClearRedoStack();
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
// XXX: What do we do if this fails?
|
||||
}
|
||||
|
||||
// Check if we can coalesce this transaction with the one at the top
|
||||
// of the undo stack.
|
||||
|
||||
top = 0;
|
||||
result = mUndoStack.Peek(&top);
|
||||
|
||||
if (tint && top) {
|
||||
PRBool didMerge = PR_FALSE;
|
||||
nsITransaction *topTransaction = 0;
|
||||
|
||||
result = top->GetTransaction(&topTransaction);
|
||||
|
||||
if (topTransaction) {
|
||||
result = topTransaction->Merge(&didMerge, tint);
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
// XXX: What do we do if this fails?
|
||||
}
|
||||
|
||||
if (didMerge) {
|
||||
delete tx;
|
||||
return result;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Check to see if we've hit the max level of undo. If so,
|
||||
// pop the bottom transaction off the undo stack and release it!
|
||||
|
||||
PRInt32 sz = 0;
|
||||
|
||||
result = mUndoStack.GetSize(&sz);
|
||||
|
||||
if (mMaxTransactionCount > 0 && sz >= mMaxTransactionCount) {
|
||||
nsTransactionItem *overflow = 0;
|
||||
|
||||
result = mUndoStack.PopBottom(&overflow);
|
||||
|
||||
// XXX: What do we do in the case where this fails?
|
||||
|
||||
if (overflow)
|
||||
delete overflow;
|
||||
}
|
||||
|
||||
// Push the transaction on the undo stack:
|
||||
|
||||
result = mUndoStack.Push(tx);
|
||||
|
||||
if (NS_FAILED(result)) {
|
||||
// XXX: What do we do in the case where a clear fails?
|
||||
// Remove the transaction from the stack, and release it?
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -52,6 +52,8 @@ public:
|
|||
virtual nsresult Undo(void);
|
||||
virtual nsresult Redo(void);
|
||||
virtual nsresult Clear(void);
|
||||
virtual nsresult BeginBatch(void);
|
||||
virtual nsresult EndBatch(void);
|
||||
virtual nsresult GetNumberOfUndoItems(PRInt32 *aNumItems);
|
||||
virtual nsresult GetNumberOfRedoItems(PRInt32 *aNumItems);
|
||||
virtual nsresult SetMaxTransactionCount(PRInt32 aMaxCount);
|
||||
|
|
@ -64,6 +66,12 @@ public:
|
|||
/* nsTransactionManager specific methods. */
|
||||
virtual nsresult ClearUndoStack(void);
|
||||
virtual nsresult ClearRedoStack(void);
|
||||
|
||||
private:
|
||||
|
||||
/* nsTransactionManager specific private methods. */
|
||||
virtual nsresult BeginTransaction(nsITransaction *aTransaction);
|
||||
virtual nsresult EndTransaction(void);
|
||||
};
|
||||
|
||||
#endif // nsTransactionManager_h__
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче