DParameterSwitch.h

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//# DParameterSwitch.h: store and retrieve Boolean parameters (switches)
//# Copyright (C) 2000,2001,2002
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef TRIALDISPLAY_DPARAMETERSWITCH_H
#define TRIALDISPLAY_DPARAMETERSWITCH_H

//#include <casa/aips.h>
#include <display/Display/DisplayParameter.h>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Implementation of DisplayParameter to store choice parameters.
// </summary>

// <use visibility=export>

// <reviewed reviewer="" date="" test="" demos="">
// </reviewed>

// <prerequisite>
// <li> <linkto class=DisplayParameter>DisplayParameter</linkto>
// </prerequisite>

// <etymology>
// DParameterSwitch is an implementation of a DisplayParameter
// providing a boolean (switch) parameter type.
// </etymology>

// <synopsis>

// This class is derived from <linkto
// class=DisplayParameter>DisplayParameter</linkto> and provides a
// boolean switch parameter. Parameters can be True or False.
// They cannot be unset.

// </synopsis>

// <example>
// <srcblock>

// DParameterSwitch pswitch("myswitch", "Axis labels",
//                          "Do you want to draw axis labels?",
//                          True,True);
//
// // ...
//
// // update the parameter from some Record
// pswitch.fromRecord(rec);
//
// // examine the value of the parameter
// if (pswitch.value()) {
// // ...
// }
// </srcblock>
// </example>

// <motivation>
// Switches are common.
// </motivation>

// <thrown>
// <li> None.
// </thrown>

// <todo asof="2002/04/22">
// <li> Nothing known.
// </todo>

        class DParameterSwitch : public DisplayParameter {

        public:

                // Constructor taking the name of the parameter, a short
                // description, some help text, a default value, an initial value,
                // the context of the parameter.
                DParameterSwitch(const String name, const String description,
                                 const String help,
                                 const Bool defaultvalue, const Bool value,
                                 const String context="");

                // (Required) copy constructor.
                DParameterSwitch(const DParameterSwitch& other);

                // Destructor.
                virtual ~DParameterSwitch();

                // (Required) copy assignment.
                DParameterSwitch& operator=(const DParameterSwitch& other);

                // Parse <src>record</src>, and update this parameter.  Return
                // <src>True</src> if the parameter is changed, otherwise return
                // <src>False</src>.
                virtual Bool fromRecord(const RecordInterface& record);

                // Place a record describing this parameter in a sub-field of
                // <src>record</src> with name matching that of this parameter.  If
                // <src>overwrite</src> is <src>True</src>, then any existing field
                // with matching name will be overwritten.  If <src>fullrecord</src>
                // is <src>True</src>, then a complete description of the parameter
                // is given, otherwise just its current value is stored in
                // <src>record</src>.  Presently <src>fullrecord</src> is ignored.
                virtual void toRecord(RecordInterface& record, const Bool fullrecord = True,
                                      const Bool overwrite = False);

                // Return the default for this parameter.
                Bool defaultValue() const {
                        return itsDefaultValue;
                }

                // Return the current value of this parameter.
                Bool value() const {
                        return itsValue;
                }

                // Set or change the default value for this parameter.
                void setDefaultValue(const Bool defaultvalue) {
                        itsDefaultValue = defaultvalue;
                }

                // Set or change the current value.
                void setValue(const Bool value) {
                        itsValue = value;
                }

        protected:

                // (Required) default constructor.
                DParameterSwitch();

        private:

                // Store for the default of this parameter.
                Bool itsDefaultValue;

                // Store for the value of this parameter.
                Bool itsValue;

        };


} //# NAMESPACE CASA - END

#endif