QmitkSliceNavigationListener.h

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

The Medical Imaging Interaction Toolkit (MITK)

Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.

Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.

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


#ifndef __Q_MITK_SLICE_NAVIGATION_LISTENER_H
#define __Q_MITK_SLICE_NAVIGATION_LISTENER_H

#include <itkEventObject.h>

#include <QObject>

#include <org_mitk_gui_qt_common_Export.h>

namespace itk
{
  class Object;
}

namespace mitk
{
  class SliceNavigationController;
  struct IRenderWindowPart;
}


class MITK_QT_COMMON QmitkSliceNavigationListener : public QObject
  {
    Q_OBJECT

  public:
    QmitkSliceNavigationListener();
    ~QmitkSliceNavigationListener() override;

  signals:
    void SliceChanged();

  public slots:
    void RenderWindowPartActivated(mitk::IRenderWindowPart* renderWindowPart);
    void RenderWindowPartDeactivated(mitk::IRenderWindowPart* renderWindowPart);

  protected slots:
      void OnSliceChangedDelayed();

  protected:

    void OnSliceChangedInternal(const itk::EventObject& e);

    void OnSliceNavigationControllerDeleted(const itk::Object* sender, const itk::EventObject& /*e*/);

    bool InitObservers();
    void RemoveObservers(const mitk::SliceNavigationController* deletedSlicer);
    void RemoveAllObservers(mitk::IRenderWindowPart* deletedPart = nullptr);

    mitk::IRenderWindowPart* m_renderWindowPart;

    // Needed for observing the events for when a slice or time step is changed.
    bool m_PendingSliceChangedEvent;

    struct ObserverInfo
    {
      mitk::SliceNavigationController* controller;
      int observerTag;
      std::string renderWindowName;
      mitk::IRenderWindowPart* renderWindowPart;

      ObserverInfo(mitk::SliceNavigationController* controller, int observerTag,
        const std::string& renderWindowName, mitk::IRenderWindowPart* part);
    };

    typedef std::multimap<const mitk::SliceNavigationController*, ObserverInfo> ObserverMapType;
    ObserverMapType m_ObserverMap;

    bool m_internalUpdateFlag;
  };

#endif