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/* This file is part of the KDE project
* Copyright (C) 2007 Thomas Zander <zander@kde.org>
*
* 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; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef KOCANVASOBSERVERBASE_H
#define KOCANVASOBSERVERBASE_H
class KoCanvasBase;
#include "flake_export.h"
/**
* An abstract canvas observer interface class.
* Dockers that want to be notified of active canvas changes
* should implement that interface so that the tool controller
* can give them the active canvas.
*/
class FLAKE_EXPORT KoCanvasObserverBase
{
public:
KoCanvasObserverBase();
virtual ~KoCanvasObserverBase();
/**
* re-implement this method in your canvas observer. It will be called
* whenever a canvas becomes active. Note that you are responsible for
* not connecting more than one time to the signals of a canvas or any
* of the QObjects you can access through the canvas.
*/
virtual void setCanvas(KoCanvasBase *canvas) = 0;
/**
* re-implement to notify the observer that its canvas is no longer
* among the living. The daisies, it is pushing up. This means you
* don't have to unconnect, it's dead.
*/
virtual void unsetCanvas() = 0;
};
#endif // KOCANVASOBSERVERBASE_H
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