vtkUndoElement.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkUndoElement_h
#define vtkUndoElement_h
 
#include "vtkObject.h"
#include "vtkPVVTKExtensionsCoreModule.h" // needed for export macro
class vtkCollection;
 
class VTKPVVTKEXTENSIONSCORE_EXPORT vtkUndoElement : public vtkObject
{
public:
  vtkTypeMacro(vtkUndoElement, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  virtual int Undo() = 0;
 
  virtual int Redo() = 0;
 
 
  vtkGetMacro(Mergeable, bool);
 
  virtual bool Merge(vtkUndoElement* vtkNotUsed(new_element)) { return false; }
 
  // Set the working context if run inside a UndoSet context, so object
  // that are cross referenced can leave long enough to be associated
  // to another object. Otherwise the undo of a Delete will create the object
  // again but as no-one is holding a reference to that newly created object
  // it will be automatically deleted. Therefore, we provide a collection
  // that will hold a reference during an undoset so the object has a chance
  // to be attached to the ProxyManager or any other object.
  virtual void SetUndoSetWorkingContext(vtkCollection* workCTX)
  {
    this->UndoSetWorkingContext = workCTX;
  }
 
protected:
  vtkUndoElement();
  ~vtkUndoElement() override;
 
 
  bool Mergeable;
  vtkSetMacro(Mergeable, bool);
  vtkCollection* UndoSetWorkingContext;
 
private:
  vtkUndoElement(const vtkUndoElement&) = delete;
  void operator=(const vtkUndoElement&) = delete;
};
 
#endif