bool pt_PieceTable::undoCmd(void)
{
// do a user-atomic undo.
// return false if we can't.
PX_ChangeRecord * pcr;
if (!m_history.getUndo(&pcr))
return false;
UT_return_val_if_fail (pcr,false);
// the first undo record tells us whether it is
// a simple change or a glob. there are two kinds
// of globs: a multi-step change (display atomic)
// like deleting a selection that spans a paragraph
// break; and a user-atomic glob like doing a search
// and replace over the whole document.
//
// for a simple change, we just do it and return.
// for a glob, we loop until we do the
// corresponding other end.
m_history.setScanningUndoGLOB(false);
UT_Byte flagsFirst = GETGLOBFLAGS(pcr);
if(m_fragments.areFragsDirty())
{
m_fragments.cleanFrags();
}
do
{
PX_ChangeRecord * pcrRev = pcr->reverse(); // we must delete this.
pcrRev->setAdjustment(pcr->getAdjustment());
pcrRev->setDocument(getDocument());
pcrRev->setCRNumber();
UT_return_val_if_fail (pcrRev,false);
UT_Byte flagsRev = GETGLOBFLAGS(pcrRev);
bool bResult = _doTheDo(pcrRev, true);
delete pcrRev;
if (!bResult)
return false;
if (flagsRev == flagsFirst) // stop when we have a matching end
break;
} while (m_history.getUndo(&pcr));
m_history.setScanningUndoGLOB(false);
m_pDocument->updateFields();
return true;
}
bool pt_PieceTable::redoCmd(void)
{
// do a user-atomic redo.
// return false if we can't.
m_history.setScanningUndoGLOB(false);
PX_ChangeRecord * pcr;
if (!m_history.getRedo(&pcr))
return false;
UT_return_val_if_fail (pcr,false);
// the first undo record tells us whether it is
// a simple change or a glob. there are two kinds
// of globs: a multi-step change (display atomic)
// like deleting a selection that spans a paragraph
// break; and a user-atomic glob like doing a search
// and replace over the whole document.
//
// for a simple change, we just do it and return.
// for a glob, we loop until we do the
// corresponding other end.
UT_Byte flagsRevFirst = GETREVGLOBFLAGS(pcr);
if(m_fragments.areFragsDirty())
{
m_fragments.cleanFrags();
}
while (m_history.getRedo(&pcr))
{
pcr->setCRNumber(); // update the CRNumber
if (!_doTheDo(pcr, false))
return false;
if (flagsRevFirst == GETGLOBFLAGS(pcr)) // stop when we have a matching end
break;
}
m_history.setScanningUndoGLOB(false);
return true;
}