lyx_mirror/src/undo.C

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/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-1999 The LyX Team.
*
* ====================================================== */
#include <config.h>
#include "undo.h"
#ifdef __GNUG__
#pragma implementation
#endif
UndoStack::UndoStack()
: limit(100) {}
Undo * UndoStack::pop()
{
if (stakk.empty()) return 0;
Undo * result = stakk.front();
stakk.pop_front();
return result;
}
Undo * UndoStack::top()
{
if (stakk.empty()) return 0;
return stakk.front();
}
UndoStack::~UndoStack()
{
clear();
}
void UndoStack::clear()
{
while (!stakk.empty()) {
Undo * tmp = stakk.front();
stakk.pop_front();
delete tmp;
}
}
void UndoStack::SetStackLimit(Stakk::size_type l)
{
limit = l;
}
void UndoStack::push(Undo * undo_arg)
{
if (!undo_arg) return;
stakk.push_front(undo_arg);
if (stakk.size() > limit) {
Undo * tmp = stakk.back();
stakk.pop_back();
delete tmp;
}
}