itkEventObject.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  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 itkEventObject_h
#define itkEventObject_h
 
#include "itkIndent.h"
 
namespace itk
{
class ITKCommon_EXPORT EventObject
{
public:
  EventObject() = default;
 
  EventObject(const EventObject &) = default;
 
  EventObject &
  operator=(const EventObject &) = delete;
 
  virtual ~EventObject() = default;
 
  virtual EventObject *
  MakeObject() const = 0;
 
  virtual void
  Print(std::ostream & os) const;
 
  virtual const char *
  GetEventName() const = 0;
 
  virtual bool
  CheckEvent(const EventObject *) const = 0;
 
protected:
  virtual void
  PrintSelf(std::ostream & os, Indent indent) const;
 
  virtual void
  PrintHeader(std::ostream & os, Indent indent) const;
 
  virtual void
  PrintTrailer(std::ostream & os, Indent indent) const;
};
 
inline std::ostream &
operator<<(std::ostream & os, const EventObject & e)
{
  e.Print(os);
  return os;
}
#define ITKEvent_EXPORT ITKCommon_EXPORT
 
#define itkEventMacroDeclaration(classname, super)         \
                                  \
  class ITKEvent_EXPORT classname : public super           \
  {                                                        \
  public:                                                  \
    using Self = classname;                                \
    using Superclass = super;                              \
    classname() = default;                                 \
    classname(const Self & s);                             \
    virtual ~classname() override;                         \
    virtual const char *                                   \
    GetEventName() const override;                         \
    virtual bool                                           \
    CheckEvent(const itk::EventObject * e) const override; \
    virtual itk::EventObject *                             \
    MakeObject() const override;                           \
                                                           \
  private:                                                 \
    void                                                   \
    operator=(const Self &);                               \
  };                                                       \
  static_assert(true, "Compile time eliminated. Used to require a semi-colon at end of macro.")
 
#define itkEventMacroDefinition(classname, super)                            \
  classname::classname(const classname & s)                                  \
    : super(s){};                                                            \
  classname::~classname() {}                                                 \
  const char * classname::GetEventName() const { return #classname; }        \
  bool         classname::CheckEvent(const itk::EventObject * e) const       \
  {                                                                          \
    return (dynamic_cast<const classname *>(e) != nullptr);                  \
  }                                                                          \
  itk::EventObject * classname::MakeObject() const { return new classname; } \
  static_assert(true, "Compile time eliminated. Used to require a semi-colon at end of macro.")
 
#if !defined(ITK_LEGACY_REMOVE)
// Support Pre 2015 code bases
 
// This macro duplicates some of the declaration and definition
// macro code. The purpose is to provide a backward compatibility API
// for ITK applications.
// NOTE: New applications should use itkEventMacroDeclaration (in a
// .h file) and itkEventMacroDefinition (in a compiled .cxx
// file). This new approach guarantees that only one copy of the
// implementation will be present.
//
#  define itkEventMacro(classname, super)                  \
                                \
    class ITKEvent_EXPORT classname : public super         \
    {                                                      \
    public:                                                \
      using Self = classname;                              \
      using Superclass = super;                            \
      classname() {}                                       \
      virtual ~classname() {}                              \
      virtual const char *                                 \
      GetEventName() const                                 \
      {                                                    \
        return #classname;                                 \
      }                                                    \
      virtual bool                                         \
      CheckEvent(const itk::EventObject * e) const         \
      {                                                    \
        return (dynamic_cast<const Self *>(e) != nullptr); \
      }                                                    \
      virtual itk::EventObject *                           \
      MakeObject() const                                   \
      {                                                    \
        return new Self;                                   \
      }                                                    \
      classname(const Self & s)                            \
        : super(s){};                                      \
                                                           \
    private:                                               \
      void                                                 \
      operator=(const Self &);                             \
    };
#endif
itkEventMacroDeclaration(NoEvent, EventObject);
itkEventMacroDeclaration(AnyEvent, EventObject);
itkEventMacroDeclaration(DeleteEvent, AnyEvent);
itkEventMacroDeclaration(StartEvent, AnyEvent);
itkEventMacroDeclaration(EndEvent, AnyEvent);
itkEventMacroDeclaration(ProgressEvent, AnyEvent);
itkEventMacroDeclaration(ExitEvent, AnyEvent);
itkEventMacroDeclaration(AbortEvent, AnyEvent);
itkEventMacroDeclaration(ModifiedEvent, AnyEvent);
itkEventMacroDeclaration(InitializeEvent, AnyEvent);
itkEventMacroDeclaration(IterationEvent, AnyEvent);
itkEventMacroDeclaration(MultiResolutionIterationEvent, IterationEvent);
itkEventMacroDeclaration(PickEvent, AnyEvent);
itkEventMacroDeclaration(StartPickEvent, PickEvent);
itkEventMacroDeclaration(EndPickEvent, PickEvent);
itkEventMacroDeclaration(AbortCheckEvent, PickEvent);
itkEventMacroDeclaration(FunctionEvaluationIterationEvent, IterationEvent);
itkEventMacroDeclaration(GradientEvaluationIterationEvent, IterationEvent);
itkEventMacroDeclaration(FunctionAndGradientEvaluationIterationEvent, IterationEvent);
itkEventMacroDeclaration(UserEvent, AnyEvent);
#undef ITKEvent_EXPORT
#define ITKEvent_EXPORT ITK_ABI_EXPORT
 
} // end namespace itk
 
#endif