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//# PixelCanvasEvent.h: base class for event information for PixelCanvases
//# Copyright (C) 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>
// Base class describing event information for PixelCanvases.
// </summary>
// <use visibility=local>
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
// <etymology>
// "PixelCanvasEvents" describes "Events" (ie. things which happen at a
// measurable time) which occur on PixelCanvases.
// </etymology>
// <prerequisite>
// <li> <linkto class=DisplayEvent>DisplayEvent</linkto>
// </prerequisite>
// <synopsis>
// This class adds to the information stored in the <linkto
// class=DisplayEvent>DisplayEvent</linkto> class. It adds
// information specific to events occuring on PixelCanvases, viz.
// a pointer to the PixelCanvas itself.
// </synopsis>
// <example>
// </example>
// <motivation>
// It is desirable to locate in a single place the information which
// is common to all events occuring on PixelCanvases.
// </motivation>
// <thrown>
// None.
// </thrown>
// <todo asof="1999/10/15">
// None.
// </todo>
class PixelCanvasEvent : public DisplayEvent {
public:
// Constructor, taking a pointer to a PixelCanvas.
PixelCanvasEvent(PixelCanvas *pc);
// Destructor.
virtual ~PixelCanvasEvent();
// Return a pointer to the PixelCanvas on which the event occurred.
virtual PixelCanvas *pixelCanvas() const {
return itsPixelCanvas;