QVTKOpenGLNativeWidget.h

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

  Program:   Visualization Toolkit
  Module:    QVTKOpenGLNativeWidget.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef QVTKOpenGLNativeWidget_h
#define QVTKOpenGLNativeWidget_h

#include <QOpenGLWidget>

#include "QVTKInteractor.h"        // needed for QVTKInteractor
#include "vtkGUISupportQtModule.h" // for export macro
#include "vtkNew.h"                // needed for vtkNew
#include "vtkSmartPointer.h"       // needed for vtkSmartPointer

class QOpenGLDebugLogger;
class QOpenGLFramebufferObject;
class QVTKInteractor;
class QVTKInteractorAdapter;
class QVTKOpenGLNativeWidgetObserver;
class vtkGenericOpenGLRenderWindow;

class VTKGUISUPPORTQT_EXPORT QVTKOpenGLNativeWidget : public QOpenGLWidget
{
  Q_OBJECT
  typedef QOpenGLWidget Superclass;
public:
  QVTKOpenGLNativeWidget(QWidget* parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
  ~QVTKOpenGLNativeWidget() override;


  void SetRenderWindow(vtkGenericOpenGLRenderWindow* win);
  void SetRenderWindow(vtkRenderWindow* win);
  virtual vtkRenderWindow* GetRenderWindow();

  virtual QVTKInteractorAdapter* GetInteractorAdapter() { return this->InteractorAdapter; }

  virtual QVTKInteractor* GetInteractor();

  static void copyFromFormat(const QSurfaceFormat& format, vtkRenderWindow* win);

  static void copyToFormat(vtkRenderWindow* win, QSurfaceFormat& format);

  static QSurfaceFormat defaultFormat();

  virtual void setEnableHiDPI(bool enable);
  virtual bool enableHiDPI() { return this->EnableHiDPI; }

  void setQVTKCursor(const QCursor &cursor);

signals:
  void mouseEvent(QMouseEvent* event);

protected slots:
  virtual void cleanupContext();

private slots:
  void recreateFBO();

  void startEventCallback();

  void cursorChangedCallback(vtkObject* caller, unsigned long vtk_event,
    void* client_data, void* call_data);

protected:
  bool event(QEvent* evt) Q_DECL_OVERRIDE;
  void initializeGL() Q_DECL_OVERRIDE;
  void resizeGL(int w, int h) Q_DECL_OVERRIDE;
  void paintGL() Q_DECL_OVERRIDE;

  void mousePressEvent(QMouseEvent* event) Q_DECL_OVERRIDE;
  void mouseMoveEvent(QMouseEvent* event) Q_DECL_OVERRIDE;
  void mouseReleaseEvent(QMouseEvent* event) Q_DECL_OVERRIDE;
  void mouseDoubleClickEvent(QMouseEvent* event) Q_DECL_OVERRIDE;

  void requireRenderWindowInitialization();

  virtual bool renderVTK();

protected:
  vtkSmartPointer<vtkGenericOpenGLRenderWindow> RenderWindow;
  QVTKInteractorAdapter* InteractorAdapter;

  bool EnableHiDPI;
  int OriginalDPI;

  static const double DevicePixelRatioTolerance;

private:
  Q_DISABLE_COPY(QVTKOpenGLNativeWidget);

  void windowFrameEventCallback();

  QOpenGLFramebufferObject* FBO;
  bool InPaintGL;
  bool DoVTKRenderInPaintGL;
  vtkNew<QVTKOpenGLNativeWidgetObserver> Observer;
  friend class QVTKOpenGLNativeWidgetObserver;
  QOpenGLDebugLogger* Logger;
};

#endif