CASAviewer

//# WCMotionEH.h: WorldCanvas motion event handler

//# Copyright (C) 1993,1994,1995,1996,1998,1999,2000

//# 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_WCMOTIONEH_H

#define TRIALDISPLAY_WCMOTIONEH_H

​

#include <casa/aips.h>

#include <display/DisplayEvents/WCMotionEvent.h>

​

namespace casa { //# NAMESPACE CASA - BEGIN

​

//

// <summary>

// Base class for handling WorldCanvas motion events.

// </summary>

//

// <prerequisite>

// <li> <linkto class="WCMotionEvent">WCMotionEvent</linkto>

// <li> Understanding of Display library event-handling methodology

// </prerequisite>

//

// <etymology>

// WCMotionEH : WorldCanvas motion event-handler.

// </etymology>

//

// <synopsis>

// This is a base class intended to be derived from in applications.  The user must

// write a derived class and override the operator() function.  The operator() function

// is called whenever the pointer moves across the world canvas.

//

// This base class does have a concrete implementation, namely to report

// to stdout events it receives.  To effect this behaviour, create an instance

// this class and register it as an event-handler on a WorldCanvas.

// </synopsis>

//

// <motivation>

// Provide the user with an object-oriented approach to event handling and

// include world-coordinate position information.

// </motivation>