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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;
 class KoCanvasObserverBasePrivate;
 
 #include "flake_export.h"
 
 class QString;
 
 /**
  * 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();
 
     virtual QString observerName() const;
 
     /**
      * set observed canvas
      * @param canvas canvas to observe. Can be 0.
      */
     void setObservedCanvas(KoCanvasBase *canvas);
 
     /**
      * notify the observer that canvas is gone
      */
     void unsetObservedCanvas();
 
     /**
      * the currently observed canvas
      * @return observed canvas, can be 0
      */
     KoCanvasBase* observedCanvas() const;
 
 protected:
     /**
      * 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.
      * Note that currently there is a bug where in certain specific
      * circumstances unsetCanvas can be called when it shouldn't, see for
      * example KWStatisticsDocker for a workaround for this problem.
      */
     virtual void unsetCanvas() = 0;
 
 private:
     KoCanvasObserverBasePrivate * const d;
 };
 
 #endif // KOCANVASOBSERVERBASE_H