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//# PCPositionEH.h: PixelCanvas position event handler
//# Copyright (C) 1993,1994,1995,1996,1999,2000
//# 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
//#
//# $Id$
namespace casa { //# NAMESPACE CASA - BEGIN
class PixelCanvas;
//
// <summary>
// PixelCanvas Event Handler for managing keyboard and mouse button
// events
// </summary>
//
// <prerequisite>
// <li> <linkto class="PCPositionEvent">PCPositionEvent</linkto>
// </prerequisite>
//
// <etymology>
// PCPositionEH : PixelCanvas Position Event Handler
// </etymology>
//
// <synopsis>
// Designed for derivation, this class is the base class which
// is communicated to when an X button or keyboard event is sent
// to the PixelCanvas. The application programmer should derive
// from this class, add any data fields needed, and override
// operator () to respond properly to keyboard and mouse button
// events.
// </synopsis>
//
// <motivation>
// Wanted a standard method for event management. It was felt
// that a class might be more flexible than callback methods