void OpUndo::Do(OpDescriptor*)
{
// Remember our document, because in debug builds we need to access it after End()
// has been called, and End() deletes the operation.
Document *pDoc = pOurDoc;
// #ifdef _DEBUG
// // Ensure that the size of the operation history is valid before the undo
// pDoc->GetOpHistory().DebugSizeCheck();
// #endif
pDoc->GetOpHistory().UndoPrev(); // Undo the previous operation
End();
// if there are no more actions to undo and the operation history has not been reduced
// then mark the document as un-modified.
if ( (!(pDoc->GetOpHistory().CanUndo())) && (!(pDoc->GetOpHistory().IsReduced())) )
{
pDoc->SetModified(FALSE);
}
#ifdef _DEBUG
// Ensure that the size of the operation history is valid after the undo
pDoc->GetOpHistory().DebugSizeCheck();
#endif
}
void OpRedo::Do(OpDescriptor*)
{
// ENSURE(FALSE,"Someone's trying to Redo!");
// Remember our document, because in debug builds we need to access it after End()
// has been called, and End() deletes the operation.
Document *pDoc = pOurDoc;
pDoc->GetOpHistory().RedoNext();
End();
#ifdef _DEBUG
// Ensure that the size of the operation history is valid
pDoc->GetOpHistory().DebugSizeCheck();
#endif
}
OpState OpRedo::GetState(String_256* UIDescription, OpDescriptor*)
{
OpState OpSt;
// Undo always works on the selected document...
Document *pDocument = Document::GetSelected();
if (pDocument)
{
OperationHistory *pOpHist = &(pDocument->GetOpHistory());
// Is there an Operation History?
if (pOpHist)
{
// The Redo operation can only be invoked if there are any operations to redo.
if (pOpHist->CanRedo())
{
// Temporary String used for Operation Name
String_256 OpName;
// Get the name of operation to be undone
pOpHist->GetRedoOpName(&OpName);
//Concatenate The Menu Description with the operation name
String Space = _T(" ");
*UIDescription += Space;
*UIDescription += OpName;
return OpSt;
}
}
}
//ELSE set to state to disabled
OpSt.Greyed = TRUE;
// Load reason why operation is disabled
String_256 DisableReason(_R(IDS_REDO_DISABLED));
*UIDescription = DisableReason;
return(OpSt);
}
