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//-*-C++-*-
/*
**************************************************************************
description
--------------------
copyright : (C) 2000-2001 by Andreas Zehender
email : zehender@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. *
* *
**************************************************************************/
#ifndef PMCOMMANDMANAGER_H
#define PMCOMMANDMANAGER_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "pmcommand.h"
#include <qptrstack.h>
#include <qobject.h>
class PMPart;
/**
* Manager for PMCommand objects.
*
* The class PMCommandManager stores stacks of commands for undo/redo
* operations.
*/
class PMCommandManager : public QObject
{
Q_OBJECT
public:
/**
* Creates a new PMCommandManager
*/
PMCommandManager( PMPart* thepart );
/**
* Deletes the command manager. All commands are deleted as well.
*/
~PMCommandManager( );
/**
* Adds the @ref PMCommand to the command stack.
* All commands in the m_redoCommands stack are deleted.
*/
void execute( PMCommand* cmd );
/**
* Moves the last command to the m_redoCommands stack.
*/
void undo( );
/**
* Moves the last redo command to the command stack.
*/
void redo( );
/**
* Deletes the commands
*/
void clear( );
/**
* Returns the maximal number of items that can be undone/redone.
*/
unsigned int maxUndoRedo( ) const { return m_maxUndoRedo; }
/**
* Sets the maximal number of items that can be undone/redone.
*/
void setMaxUndoRedo( unsigned int n ) { m_maxUndoRedo = n; }
/**
* Called by an executed command. Will emit objectChanged( )
*/
void cmdObjectChanged( PMObject* obj, const int mode );
/**
* Called by an executed command. Will emit idChanged( )
*/
void cmdIDChanged( PMObject* obj, const QString& oldID );
/**
* Returns a pointer to the part. For commands that need to access the
* part directly.
*/
PMPart* part( ) const { return m_pPart; }
signals:
/**
* emmited, when the undo and redo command texts change
*/
void updateUndoRedo( const QString& undo, const QString& redo );
/**
* Signal that is emitted when an object is changed.
* Mode is a bit combination of @ref PMChange constants.
*/
void objectChanged( PMObject* obj, const int mode, QObject* sender );
/**
* Signal that is emitted when the id of the object is changed
*/
void idChanged( PMObject* obj, const QString& oldID );
private:
/**
* The executed commands.
*/
PMCommandList m_commands;
/**
* The undone commands.
*/
PMCommandList m_redoCommands;
// the maximal number of items that can be undone/redone.
unsigned int m_maxUndoRedo;
PMObject* m_pLastChangedObject;
PMPart* m_pPart;
};
#endif
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