vtkAbstractWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkAbstractWidget.h,v

  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 vtkAbstractWidget_h
#define vtkAbstractWidget_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkInteractorObserver.h"

class vtkWidgetEventTranslator;
class vtkWidgetCallbackMapper;
class vtkWidgetRepresentation;

class VTKINTERACTIONWIDGETS_EXPORT vtkAbstractWidget : public vtkInteractorObserver
{
public:

  vtkTypeMacro(vtkAbstractWidget, vtkInteractorObserver);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void SetEnabled(int) override;


  vtkSetClampMacro(ProcessEvents, vtkTypeBool, 0, 1);
  vtkGetMacro(ProcessEvents, vtkTypeBool);
  vtkBooleanMacro(ProcessEvents, vtkTypeBool);

  vtkWidgetEventTranslator* GetEventTranslator() { return this->EventTranslator; }

  virtual void CreateDefaultRepresentation() = 0;

  void Render();

  void SetParent(vtkAbstractWidget* parent) { this->Parent = parent; }
  vtkGetObjectMacro(Parent, vtkAbstractWidget);


  vtkWidgetRepresentation* GetRepresentation()
  {
    this->CreateDefaultRepresentation();
    return this->WidgetRep;
  }


  vtkSetMacro(ManagesCursor, vtkTypeBool);
  vtkGetMacro(ManagesCursor, vtkTypeBool);
  vtkBooleanMacro(ManagesCursor, vtkTypeBool);

  void SetPriority(float) override;

protected:
  vtkAbstractWidget();
  ~vtkAbstractWidget() override;

  // Handles the events; centralized here for all widgets.
  static void ProcessEventsHandler(
    vtkObject* object, unsigned long event, void* clientdata, void* calldata);

  // The representation for the widget. This is typically called by the
  // SetRepresentation() methods particular to each widget (i.e. subclasses
  // of this class). This method does the actual work; the SetRepresentation()
  // methods constrain the type that can be set.
  void SetWidgetRepresentation(vtkWidgetRepresentation* r);
  vtkWidgetRepresentation* WidgetRep;

  // helper methods for cursor management
  vtkTypeBool ManagesCursor;
  virtual void SetCursor(int vtkNotUsed(state)) {}

  // For translating and invoking events
  vtkWidgetEventTranslator* EventTranslator;
  vtkWidgetCallbackMapper* CallbackMapper;

  // The parent, if any, for this widget
  vtkAbstractWidget* Parent;

  // Call data which can be retrieved by the widget. This data is set
  // by ProcessEvents() if call data is provided during a callback
  // sequence.
  void* CallData;

  // Flag indicating if the widget should handle interaction events.
  // On by default.
  vtkTypeBool ProcessEvents;

private:
  vtkAbstractWidget(const vtkAbstractWidget&) = delete;
  void operator=(const vtkAbstractWidget&) = delete;
};

#endif