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/*
This file is part of KAddressBook.
Copyright (C) 1999 Don Sanders <sanders@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As a special exception, permission is given to link this program
with any edition of Qt, and distribute the resulting executable,
without including the source code for Qt in the source distribution.
*/
#include "undo.h"
///////////////////////////////
// StackBase
void StackBase::push(Command *c)
{
mCommandStack.push(c);
emit changed();
}
bool StackBase::isEmpty()
{
return mCommandStack.isEmpty();
}
Command *StackBase::top()
{
return mCommandStack.top();
}
void StackBase::clear()
{
mCommandStack.clear();
emit changed();
}
Command *StackBase::pop()
{
Command *c = mCommandStack.pop();
if (c)
emit changed();
return c;
}
///////////////////////////////
// UndoStack
UndoStack* UndoStack::instance_ = 0;
UndoStack::UndoStack()
: StackBase()
{
// setAutoDelete( true );
}
UndoStack* UndoStack::instance()
{
if (!instance_)
instance_ = new UndoStack();
return instance_;
}
void UndoStack::undo()
{
if (isEmpty())
return;
Command *command = pop();
command->undo();
RedoStack::instance()->push( command );
}
////////////////////
// RedoStack
RedoStack* RedoStack::instance_ = 0;
RedoStack::RedoStack()
{
mCommandStack.setAutoDelete( true );
}
RedoStack* RedoStack::instance()
{
if (!instance_)
instance_ = new RedoStack();
return instance_;
}
void RedoStack::redo()
{
Command *command;
if (isEmpty())
return;
command = pop();
command->redo();
UndoStack::instance()->push( command );
}
#ifndef KAB_EMBEDDED
#include "undo.moc"
#endif //KAB_EMBEDDED
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