/*=========================================================================

  Library:   CTK
 
  Copyright (c) 2010  Kitware Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.commontk.org/LICENSE

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 
=========================================================================*/

#ifndef __ctkVTKObjectEventsObserver_h
#define __ctkVTKObjectEventsObserver_h

/// CTK includes
#include <ctkPimpl.h>

/// Qt includes
#include <QObject>
#include <QList>
#include <QString>

/// VTK includes
#include <vtkCommand.h>

#include "CTKVisualizationVTKCoreExport.h"

class ctkVTKConnection;
class vtkObject;
class ctkVTKObjectEventsObserverPrivate;

class CTK_VISUALIZATION_VTK_CORE_EXPORT ctkVTKObjectEventsObserver : public QObject
{
Q_OBJECT

public:
  typedef QObject Superclass;
  explicit ctkVTKObjectEventsObserver(QObject* parent = 0);
  virtual ~ctkVTKObjectEventsObserver(){}

  virtual void printAdditionalInfo();

  /// 
  /// Enable / Disable all ctkVTKConnections
  void setAllEnabled( bool enable );
  bool allEnabled()const;

  /// 
  /// Add a connection, an Id allowing to uniquely identify the connection is also returned
  QString addConnection(vtkObject* vtk_obj, unsigned long vtk_event,
    const QObject* qt_obj, const char* qt_slot, float priority = 0.0);

  ///
  /// Utility function that remove a connection on old_vtk_obj and add a connection
  /// to vtk_obj (same event, object, slot, priority)
  QString addConnection(vtkObject* old_vtk_obj, vtkObject* vtk_obj, unsigned long vtk_event,
    const QObject* qt_obj, const char* qt_slot, float priority = 0.0);

  ///
  /// Utility function that remove a connection on old_vtk_obj and add a connection
  /// to vtk_obj (same event, object, slot, priority)
  QString reconnection(vtkObject* vtk_obj, unsigned long vtk_event,
                       const QObject* qt_obj, const char* qt_slot, 
                       float priority = 0.0);

  /// 
  /// Remove a connection
  int removeConnection(vtkObject* vtk_obj, unsigned long vtk_event = vtkCommand::NoEvent,
                       const QObject* qt_obj = 0, const char* qt_slot = 0);

  /// 
  /// Remove all the connections
  inline int removeAllConnections();

  ///
  /// Temporarilly block all the connection
  void blockAllConnections(bool block);
  
  /// 
  /// Block/Unblock a connection.
  int blockConnection(bool block, vtkObject* vtk_obj,
                      unsigned long vtk_event, const QObject* qt_obj);
  void blockConnection(const QString& id, bool blocked);

private:
  CTK_DECLARE_PRIVATE(ctkVTKObjectEventsObserver);

};

int ctkVTKObjectEventsObserver::removeAllConnections()
{
  return this->removeConnection(0);
}

#endif