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98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// Created by: DAUTRY Philippe
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// Copyright (c) 1997-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _TDF_AttributeDelta_HeaderFile
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#define _TDF_AttributeDelta_HeaderFile
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#include <Standard.hxx>
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#include <Standard_Type.hxx>
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#include <TDF_Label.hxx>
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#include <Standard_Transient.hxx>
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#include <Standard_OStream.hxx>
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class TDF_Attribute;
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class TDF_Label;
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class Standard_GUID;
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class TDF_AttributeDelta;
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DEFINE_STANDARD_HANDLE(TDF_AttributeDelta, Standard_Transient)
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//! This class discribes the services we need to
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//! implement Delta and Undo/Redo services.
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//!
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//! AttributeDeltas are applied in an unpredictable
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//! order. But by the redefinition of the method
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//! IsNowApplicable, a condition can be verified
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//! before application. If the AttributeDelta is not
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//! yet applicable, it is put at the end of the
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//! AttributeDelta list, to be treated later. If a
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//! dead lock if found on the list, the
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//! AttributeDeltas are forced to be applied in an
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//! unpredictable order.
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class TDF_AttributeDelta : public Standard_Transient
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{
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public:
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//! Applies the delta to the attribute.
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Standard_EXPORT virtual void Apply() = 0;
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//! Returns the label concerned by <me>.
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Standard_EXPORT TDF_Label Label() const;
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//! Returns the reference attribute.
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Standard_EXPORT Handle(TDF_Attribute) Attribute() const;
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//! Returns the ID of the attribute concerned by <me>.
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Standard_EXPORT Standard_GUID ID() const;
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//! Dumps the contents.
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Standard_EXPORT virtual Standard_OStream& Dump (Standard_OStream& OS) const;
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Standard_OStream& operator<< (Standard_OStream& OS) const
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{
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return Dump(OS);
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}
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DEFINE_STANDARD_RTTIEXT(TDF_AttributeDelta,Standard_Transient)
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protected:
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Standard_EXPORT TDF_AttributeDelta(const Handle(TDF_Attribute)& anAttribute);
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private:
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Handle(TDF_Attribute) myAttribute;
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TDF_Label myLabel;
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};
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#endif // _TDF_AttributeDelta_HeaderFile
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