// Copyright (c) 2019 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _Aspect_ScrollDelta_HeaderFile
#define _Aspect_ScrollDelta_HeaderFile

#include <Aspect_VKeyFlags.hxx>
#include <NCollection_Vec2.hxx>

//! Parameters for mouse scroll action.
struct Aspect_ScrollDelta
{

  NCollection_Vec2<int> Point; //!< scale position
  double                Delta; //!< delta in pixels
  Aspect_VKeyFlags      Flags; //!< key flags

  //! Return true if action has point defined.
  bool HasPoint() const { return Point.x() >= 0 && Point.y() >= 0; }

  //! Reset at point.
  void ResetPoint() { Point.SetValues(-1, -1); }

  //! Empty constructor.
  Aspect_ScrollDelta()
      : Point(-1, -1),
        Delta(0.0),
        Flags(Aspect_VKeyFlags_NONE)
  {
  }

  //! Constructor.
  Aspect_ScrollDelta(const NCollection_Vec2<int>& thePnt,
                     double                       theValue,
                     Aspect_VKeyFlags             theFlags = Aspect_VKeyFlags_NONE)
      : Point(thePnt),
        Delta(theValue),
        Flags(theFlags)
  {
  }

  //! Constructor with undefined point.
  Aspect_ScrollDelta(double theValue, Aspect_VKeyFlags theFlags = Aspect_VKeyFlags_NONE)
      : Point(-1, -1),
        Delta(theValue),
        Flags(theFlags)
  {
  }
};

#endif // _Aspect_ScrollDelta_HeaderFile
