//==============================================================================
bool UndoManager::perform (UndoableAction* const newAction, const String& actionName)
{
if (newAction != nullptr)
{
ScopedPointer<UndoableAction> action (newAction);
if (reentrancyCheck)
{
jassertfalse; // don't call perform() recursively from the UndoableAction::perform()
// or undo() methods, or else these actions will be discarded!
return false;
}
if (actionName.isNotEmpty())
currentTransactionName = actionName;
if (action->perform())
{
ActionSet* actionSet = getCurrentSet();
if (actionSet != nullptr && ! newTransaction)
{
if (UndoableAction* const lastAction = actionSet->actions.getLast())
{
if (UndoableAction* const coalescedAction = lastAction->createCoalescedAction (action))
{
action = coalescedAction;
totalUnitsStored -= lastAction->getSizeInUnits();
actionSet->actions.removeLast();
}
}
}
else
{
actionSet = new ActionSet (currentTransactionName);
transactions.insert (nextIndex, actionSet);
++nextIndex;
}
totalUnitsStored += action->getSizeInUnits();
actionSet->actions.add (action.release());
newTransaction = false;
clearFutureTransactions();
sendChangeMessage();
return true;
}
}
return false;
}
//==============================================================================
bool UndoManager::perform (UndoableAction* const command_, const String& actionName)
{
if (command_ != 0)
{
ScopedPointer<UndoableAction> command (command_);
if (actionName.isNotEmpty())
currentTransactionName = actionName;
if (reentrancyCheck)
{
jassertfalse; // don't call perform() recursively from the UndoableAction::perform() or
// undo() methods, or else these actions won't actually get done.
return false;
}
else if (command->perform())
{
OwnedArray<UndoableAction>* commandSet = transactions [nextIndex - 1];
if (commandSet != 0 && ! newTransaction)
{
UndoableAction* lastAction = commandSet->getLast();
if (lastAction != 0)
{
UndoableAction* coalescedAction = lastAction->createCoalescedAction (command);
if (coalescedAction != 0)
{
command = coalescedAction;
totalUnitsStored -= lastAction->getSizeInUnits();
commandSet->removeLast();
}
}
}
else
{
commandSet = new OwnedArray<UndoableAction>();
transactions.insert (nextIndex, commandSet);
transactionNames.insert (nextIndex, currentTransactionName);
++nextIndex;
}
totalUnitsStored += command->getSizeInUnits();
commandSet->add (command.release());
newTransaction = false;
while (nextIndex < transactions.size())
{
const OwnedArray <UndoableAction>* const lastSet = transactions.getLast();
for (int i = lastSet->size(); --i >= 0;)
totalUnitsStored -= lastSet->getUnchecked (i)->getSizeInUnits();
transactions.removeLast();
transactionNames.remove (transactionNames.size() - 1);
}
while (nextIndex > 0
&& totalUnitsStored > maxNumUnitsToKeep
&& transactions.size() > minimumTransactionsToKeep)
{
const OwnedArray <UndoableAction>* const firstSet = transactions.getFirst();
for (int i = firstSet->size(); --i >= 0;)
totalUnitsStored -= firstSet->getUnchecked (i)->getSizeInUnits();
jassert (totalUnitsStored >= 0); // something fishy going on if this fails!
transactions.remove (0);
transactionNames.remove (0);
--nextIndex;
}
sendChangeMessage();
return true;
}
}
return false;
}