vtkUndoElement.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include "qPCL.h"  // needed for export macro
#include "vtkObject.h"
class vtkCollection;
 
class QPCL_ENGINE_LIB_API 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;
};