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/*
**************************************************************************
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 PMCOMMAND_H
#define PMCOMMAND_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <tqstring.h>
#include <tqptrlist.h>
#include "pmmessage.h"
#include "pmerrorflags.h"
class PMCommandManager;
class PMObject;
class PMPart;
/**
* Constants for object changes
*
* PMCAdd: An object was added
*
* PMCRemove: An object was removed. A signal with this constant has
* to be emitted _before_ the object is removed.
*
* PMCChildren: Some children are added or removed. Do not use. Use PMCAdd and
* PMCRemove for all childrens.
*
* PMCData: Data (for dialog views) is changed
*
* PMCDescription: The name or pixmap of the object has changed. Always
* together with PMCData.
*
* PMCViewStructure: The rendering has changed
*
* PMCNewSelection: The object was selected and all other deleselected.
* If the changed object is 0, all objects are deselected!
*
* PMCSelected: The object was selected.
*
* PMCDeselected: The object was deselected.
*
* PMCNewControlPoints: The list of control points has changed.
*
* PMCControlPointSelection: The control point selection has changed.
*
* PMCInsertError: The added object couldn't be inserted and was appended
* to the insert errors. Always together with PMCAdd.
*
* PMCNothing: Nothing was changed
*/
enum PMChange
{
PMCNothing = 0, PMCAdd = 1, PMCRemove = 2, PMCChildren = 4,
PMCData = 8, PMCDescription = 16, PMCViewStructure = 32,
PMCGraphicalChange = 64,
PMCNewSelection = 128, PMCSelected = 256,
PMCDeselected = 512,
PMCNewControlPoints = 1024, PMCControlPointSelection = 2048,
PMCInsertError = 4096
};
/**
* Base class for all commands, that support undo/redo.
*/
class PMCommand
{
friend class PMCommandManager; // only PMCommandManager can execute commands
public:
/**
* Creates an empty command object.
*/
PMCommand( ) { }
/**
* Creates a command with command text text
*/
PMCommand( const TQString &text )
{ m_text = text; }
/**
* Deletes the command.
*/
virtual ~PMCommand( ) { }
/**
* Command text shown in the undo/redo menues
*/
TQString text( ) const { return m_text; }
/**
* Sets the command text
*/
void setText( const TQString& s ) { m_text = s; }
/**
* Checks if the command is valid and sets the error message
*
* Returns a bitwise combination of @ref PMErrorFlags flags
*/
virtual int errorFlags( PMPart* ) { return PMENone; }
/**
* Returns the error message
*/
PMMessageList messages( ) { return m_errors; }
protected:
/**
* Executes the command and stores undo information.
*/
virtual void execute( PMCommandManager* theManager ) = 0;
/**
* Undoes the command
*/
virtual void undo( PMCommandManager* theManager ) = 0;
/**
* The error messages
*/
PMMessageList m_errors;
private:
/**
* The command text.
*/
TQString m_text;
};
typedef TQPtrList<PMCommand> PMCommandList;
#endif
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