protected void Redirect(FtField redirectingField, FtSequence invokedSequence, FtSequenceInvokationDelay invokationDelay,
out int fieldsAffectedFromIndex)
{
FtSequenceInvokation redirectingInvokation = redirectingField.SequenceInvokation;
int newInvokationIndex = redirectingInvokation.Index + 1;
int newInvokationStartFieldIndex;
switch (invokationDelay)
{
case FtSequenceInvokationDelay.ftikAfterField:
newInvokationStartFieldIndex = redirectingField.Index + 1;
break;
case FtSequenceInvokationDelay.ftikAfterSequence:
newInvokationStartFieldIndex = redirectingInvokation.StartFieldIndex + redirectingInvokation.FieldCount;
break;
default:
throw FtInternalException.Create(InternalError.Core_InvokeSequences_UnsupportedInvokationDelay, invokationDelay.ToString());
}
// check if redirect does not cause any change
bool changeRequired;
if (newInvokationIndex >= sequenceInvokationList.Count)
{
changeRequired = true;
}
else
{
FtSequenceInvokation nextExistingInvokation = sequenceInvokationList[newInvokationIndex];
changeRequired = (nextExistingInvokation.Sequence != invokedSequence || nextExistingInvokation.StartFieldIndex != newInvokationStartFieldIndex);
}
if (!changeRequired)
{
fieldsAffectedFromIndex = FtField.NoFieldsAffectedIndex;
}
else
{
FtField existingRedirectingField = redirectingInvokation.RedirectingField;
int unredirectfieldsAffectedFromIndex;
if (existingRedirectingField == null)
{
unredirectfieldsAffectedFromIndex = redirectingInvokation.StartFieldIndex + redirectingInvokation.FieldCount;
}
else
{
Unredirect(existingRedirectingField, out unredirectfieldsAffectedFromIndex);
if (unredirectfieldsAffectedFromIndex < 0)
{
// if not affected, set to value which will be higher than new invokation affects fields index
unredirectfieldsAffectedFromIndex = redirectingInvokation.StartFieldIndex + redirectingInvokation.FieldCount;
}
}
FtSequenceInvokation newInvokation = SequenceInvokationList.TryPredictedNew(newInvokationIndex, invokedSequence, newInvokationStartFieldIndex);
if (newInvokation == null)
{
SequenceInvokationList.Trim(newInvokationIndex);
newInvokation = SequenceInvokationList.New(invokedSequence, newInvokationStartFieldIndex);
}
FieldList.Trim(newInvokationStartFieldIndex);
for (int i = 0; i < newInvokation.FieldCount; i++)
{
FieldList.Add(newInvokation.GetField(i));
}
if (newInvokationStartFieldIndex < redirectingInvokation.StartFieldIndex + redirectingInvokation.FieldCount)
{
redirectingInvokation.SidelineFields(newInvokationStartFieldIndex);
}
if (unredirectfieldsAffectedFromIndex < newInvokationStartFieldIndex)
{
fieldsAffectedFromIndex = unredirectfieldsAffectedFromIndex;
}
else
{
fieldsAffectedFromIndex = newInvokationStartFieldIndex;
}
if (!seeking)
{
OnSequenceRedirected(redirectingField, fieldsAffectedFromIndex);
}
}
}
