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147 lines
3.9 KiB
147 lines
3.9 KiB
//-*-C++-*-
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/*
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**************************************************************************
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description
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--------------------
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copyright : (C) 2000-2001 by Andreas Zehender
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email : zehender@kde.org
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**************************************************************************
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**************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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**************************************************************************/
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#ifndef PMCOMMAND_H
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#define PMCOMMAND_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <tqstring.h>
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#include <tqptrlist.h>
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#include "pmmessage.h"
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#include "pmerrorflags.h"
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class PMCommandManager;
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class PMObject;
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class PMPart;
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/**
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* Constants for object changes
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*
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* PMCAdd: An object was added
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*
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* PMCRemove: An object was removed. A signal with this constant has
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* to be emitted _before_ the object is removed.
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*
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* PMCChildren: Some children are added or removed. Do not use. Use PMCAdd and
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* PMCRemove for all childrens.
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*
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* PMCData: Data (for dialog views) is changed
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*
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* PMCDescription: The name or pixmap of the object has changed. Always
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* together with PMCData.
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*
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* PMCViewStructure: The rendering has changed
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*
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* PMCNewSelection: The object was selected and all other deleselected.
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* If the changed object is 0, all objects are deselected!
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*
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* PMCSelected: The object was selected.
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*
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* PMCDeselected: The object was deselected.
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*
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* PMCNewControlPoints: The list of control points has changed.
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*
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* PMCControlPointSelection: The control point selection has changed.
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*
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* PMCInsertError: The added object couldn't be inserted and was appended
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* to the insert errors. Always together with PMCAdd.
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*
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* PMCNothing: Nothing was changed
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*/
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enum PMChange
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{
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PMCNothing = 0, PMCAdd = 1, PMCRemove = 2, PMCChildren = 4,
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PMCData = 8, PMCDescription = 16, PMCViewStructure = 32,
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PMCGraphicalChange = 64,
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PMCNewSelection = 128, PMCSelected = 256,
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PMCDeselected = 512,
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PMCNewControlPoints = 1024, PMCControlPointSelection = 2048,
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PMCInsertError = 4096
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};
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/**
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* Base class for all commands, that support undo/redo.
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*/
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class PMCommand
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{
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friend class PMCommandManager; // only PMCommandManager can execute commands
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public:
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/**
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* Creates an empty command object.
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*/
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PMCommand( ) { }
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/**
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* Creates a command with command text text
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*/
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PMCommand( const TQString &text )
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{ m_text = text; }
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/**
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* Deletes the command.
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*/
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virtual ~PMCommand( ) { }
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/**
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* Command text shown in the undo/redo menues
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*/
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TQString text( ) const { return m_text; }
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/**
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* Sets the command text
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*/
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void setText( const TQString& s ) { m_text = s; }
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/**
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* Checks if the command is valid and sets the error message
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*
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* Returns a bitwise combination of @ref PMErrorFlags flags
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*/
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virtual int errorFlags( PMPart* ) { return PMENone; }
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/**
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* Returns the error message
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*/
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PMMessageList messages( ) { return m_errors; }
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protected:
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/**
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* Executes the command and stores undo information.
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*/
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virtual void execute( PMCommandManager* theManager ) = 0;
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/**
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* Undoes the command
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*/
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virtual void undo( PMCommandManager* theManager ) = 0;
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/**
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* The error messages
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*/
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PMMessageList m_errors;
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private:
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/**
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* The command text.
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*/
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TQString m_text;
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};
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typedef TQPtrList<PMCommand> PMCommandList;
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#endif
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